WO2020121645A1 - Vehicle seat pad - Google Patents

Abstract

A vehicle seat pad (1), wherein a lower thigh section (11) has holes (51), and the ratio of the total area of the holes (51) in a lower thigh centre section (11M) on one side in the left-right direction of a left-right direction centre line (C) to the area of the lower thigh centre section (11M) on the one side is higher than either of the ratio of the total area of the holes (51) in a lower thigh centre section (11C) to the area of the lower thigh centre section (11C), and the ratio of the total area of the holes in a lower thigh side section (11S) on one side to the area of the lower thigh side section (11S) on the one side.

Description

Vehicle seat pad

The present invention relates to a vehicle seat pad.
The present application claims priority based on Japanese Patent Application No. 2018-234143 filed in Japan on December 14, 2018, the entire content of which is incorporated herein by reference.

As a conventional vehicle seat pad, there is one in which a plurality of holes are arranged in a seating portion for supporting a seated person (for example, Patent Document 1).

Japanese Patent Laid-Open No. 2017-56078

However, in the vehicle seat pad of Patent Document 1, there is room for further improvement with respect to maintaining the riding comfort while improving the ease of driving operation by the driver's legs (hereinafter referred to as “operability”). was there.

The present invention has an object to provide a vehicle seat pad capable of maintaining a comfortable ride while improving operability.

The vehicle seat pad of the present invention,
A vehicle seat pad, which is formed of a resin foam and has a seating portion for supporting a seated person,
Of the seating portion, a front portion is a lower thigh than a front-rear direction position separated by a length of 45% of the entire length of the seating portion in the front-rear direction from the frontmost end position of the seating portion,
Of the lower thigh, a pair of left and right first left and right sides separated by 7.5% of the total length of the lower thigh in the left-right direction from the center line in the left-right direction of the seating portion. The part inside the left-right direction from the direction position is the thigh center part,
Of the lower thigh, the pair of first left and right positions, and a pair of second left and right directions separated from the left and right centerlines by 30% of the total length of the lower thigh in the left and right direction. The portion between the position and the middle thigh of the pair of thighs,
When portions of the lower thigh on the left and right sides of the pair of second left and right positions are defined as a pair of lower thigh side portions,
The lower thigh has one or more bottomless or bottomed holes,
In the horizontal projection plane, the ratio of the total area of the holes in the thigh intermediate portion to the area of the thigh intermediate portion in at least one half in the left-right direction with the horizontal center line as a boundary is The ratio of the total area of the holes in the lower thigh center portion to the area of the lower center portion, and the total area of the holes in the lower thigh side portion with respect to the area of the lower thigh side portion in the one half portion. Higher than any of the ratios.

According to the present invention, it is possible to provide a vehicle seat pad that can maintain riding comfort while improving operability.

It is a perspective view showing a vehicle seat provided with a vehicle seat pad concerning a 1st embodiment of the present invention. It is a top view which shows a mode when the cushion pad of FIG. 1 is seen from the upper side. FIG. 3 is a cross-sectional view taken along the line AA of the cushion pad of FIG. 2, showing a cross section taken along the line AA of FIG. 2. It is a top view which shows a mode when the modification of the cushion pad of FIG. 1 is seen from the upper side. It is a top view showing a mode when a cushion pad of a vehicle seat pad concerning a 2nd embodiment of the present invention is seen from the upper part. 6 is a cross-sectional view of the cushion pad of FIG. 5 taken along the line AA of FIG. 5, taken along the line AA. It is a top view which shows the other example of a mode when the modification of the cushion pad of FIG. 5 is seen from the upper side.

The vehicle seat pad of the present invention can be used for any type of vehicle. The vehicle seat pad of the present invention is particularly suitable for use in the driver's seat.
Embodiments of a vehicle seat pad according to the present invention will be described below with reference to the drawings. The same reference numerals are given to common constituent elements in each drawing. Hereinafter, the vehicle seat pad is also simply referred to as a "seat pad".

FIG. 1 shows a vehicle seat 100 including a vehicle seat pad 1 according to a first embodiment of the present invention. As shown in FIG. 1, the seat pad 1 of the present embodiment includes a cushion pad 1a on which a seated person sits and a back pad 1b for supporting the back of the seated person. In addition to the seat pad 1, the vehicle seat 100 includes, for example, a skin 101 that covers the front side (seat side) of the seat pad 1, a frame (not shown) that supports the cushion pad 1a from below, and a back pad 1b. A frame (not shown) installed on the back side and a headrest 102 installed on the upper side of the back pad 1b for supporting the head of the seated person are provided. The skin 101 is made of, for example, a material having good air permeability (cloth or the like). The cushion pad 1a and the back pad 1b are each formed of resin foam. The resin foam forming the cushion pad 1a and the back pad 1b is preferably a soft resin foam, more preferably a soft polyurethane foam. The cushion pad 1a and the back pad 1b can be configured separately from each other.
In the present specification, as shown in each drawing, each of “upper”, “lower”, “left”, “right”, “front”, and “rear” when viewed from a seated person sitting on the seat pad 1. The directions are simply referred to as “up”, “down”, “left”, “right”, “front”, “rear”, etc.
Below, of the seat pad 1, the cushion pad 1a will be described instead of the back pad 1b. Therefore, the cushion pad 1a may be simply referred to as "seat pad 1".

2 is a plan view showing a state where the cushion pad 1a of the seat pad 1 of FIG. 1 is viewed from above, in other words, a horizontal projection diagram showing a state where the cushion pad 1a is projected on a horizontal projection plane. is there. As shown in FIGS. 1 and 2, the cushion pad 1 a is provided with a seating portion (also referred to as “main pad portion”) 10 configured to support a seated person from below, and on both left and right sides of the seating portion 10. Then, the pair of side pad portions 20 that are raised above the seating portion 10 and are configured to support the seated person from both the left and right sides, and the back pad 1b are located in the rear side of the seating portion 10 and in the vertical direction. And a back pad facing portion 30 configured so as to face each other.
In the example of FIG. 2, on the upper surface (front surface) US of the cushion pad 1a, a groove 40a extending substantially in the front-rear direction between the seat portion 10 and the side pad portion 20, and a seat portion 10 and a back pad facing portion 30 are provided. A groove 40b extending substantially in the left-right direction between the two is provided, and a groove 40c extending substantially in the left-right direction inside the seating portion 10 is provided. Inside the grooves 40a, 40b, 40c, for example, an attachment tool (not shown) for attaching the skin 101 (FIG. 1) to the cushion pad 1a is arranged. In the example of FIG. 2, in the horizontal projection plane, the boundary line between the seating portion 10 and the side pad portion 20 is the groove width center line of the groove 40a therebetween, and the seating portion 10 and the back pad facing portion 30 are Is the center line of the groove width of the groove 40b between them.
However, the grooves 40a and 40b may be located at positions different from the boundary line between the seating portion 10 and the side pad portion 20 and the boundary line between the seating portion 10 and the back pad facing portion 30. The grooves 40a to 40c may not be provided on the upper surface US of the cushion pad 1a.
The seating portion 10 is configured to support the thigh of the seated person from below, and is located rearward of the lower thigh 11 and the lower thigh 11 to support the seated person's hip from below. The lower part 12 of the hips is configured. In the present specification, as shown in FIG. 2, in the horizontal projection plane, a distance L2 that is 45% of the total length L1 of the seating portion 10 in the front-rear direction is separated from the frontmost end position T of the seating portion 10 in the seating portion 10. A portion on the front side of the front-rear boundary position B is the lower thigh 11, and a portion on the rear side of the front-rear boundary position B is the lower hip 12. That is, even when the groove 40c is arranged inside the seating portion 10 as in the example of FIG. 2, the front-rear boundary position B between the lower thigh 11 and the lower thigh 12 depends on the position of the groove 40c. Without being prescribed.

The lower thigh 11 includes a lower thigh center portion 11C, a pair of lower thigh intermediate portions 11M, and a pair of lower thigh side portions 11S.
The lower thigh center portion 11C is located on the left and right sides by 7.5% of the total length of the lower thigh 11 in the left and right direction from the left and right centerline C located in the left and right center of the sitting portion 10 in the lower thigh 11. It is a part on the inner side in the left-right direction than the pair of first left-right positions C1 separated from each other. The total length L3 in the left-right direction is orthogonal to the center line C in the left-right direction in the lower thigh 11, and is the longest length of the line segment from one end of the lower thigh 11 to the other end. For example, when the total length L3 is 400 mm, the first left-right direction position C1 is 400 mm×0.075=30 mm in the left-right direction from the center line C in the left-right direction.
The pair of inferior thigh intermediate portions 11M includes, on the lower thigh 11, a pair of first left and right positions C1 and 30% of the entire length of the lower thigh 11 in the left and right direction from the center line C in the left and right direction. It is a portion between a pair of second lateral positions C2 which are separated from each other. For example, when the total length L3 is 400 mm, the second lateral direction position C2 is located 400 mm×0.3=120 mm in the lateral direction from the lateral center line C.
The pair of lower thigh side portions 11S are portions of the lower thigh 11 on the outer sides in the left-right direction with respect to the pair of second left-right positions C2.

FIG. 3 shows the cushion pad 1a of FIG. 2 in a cross section in the vertical direction (vertical direction) along the line AA of FIG. As shown in FIGS. 2 and 3, the lower thigh 11 has a bottomless hole 51 that is open at the bottom surface or the upper surface US or the back surface BS of the lower thigh 11 (in the example of FIG. 3, the lower thigh portion). The holes 51 of 11 are all bottomless). Regarding the hole 51, “bottomless” means that the hole 51 is a through hole, that is, that the hole 51 penetrates the seating portion 10. Further, regarding the hole 51, “bottomed” means that the hole 51 is a dent, that is, one end of the hole 51 is opened on any surface (top surface US or back surface BS) of the seating portion 10. In addition, the other end (bottom portion) of the hole 51 does not open on the surface opposite to the open surface of the seating portion 10, but ends inside the seating portion 10. In each example described in this specification, when the lower thigh 11 has a bottomed hole 51, the depth (vertical length) of the hole 51 is equal to the thickness of the lower thigh 11 (vertical length). 30% or more and less than 100% is preferable.

In the present embodiment, in the horizontal projection plane, the total of the holes 51 in the thigh intermediate portion 11M with respect to the area of the thigh intermediate portion 11M in the half portion 11h on at least one side in the horizontal direction with the horizontal center line C as a boundary. The ratio of the area is the ratio of the total area of the holes 51 in the thigh center portion 11C to the area of the thigh center portion 11C, and the area of the thigh side portion 11S in the one half 11h with respect to the thigh side. It is higher than any of the ratios of the total area of the holes 51 in the portion 11S. The ratio of the total area of the holes 51 in the thigh intermediate portion 11M to the area of the thigh intermediate portion 11M in each half 11h is referred to as the intermediate porosity. The ratio of the total area of the holes 51 in the lower thigh center portion 11C to the area of the lower thigh center portion 11C is called the center porosity. The ratio of the total area of the holes 51 in the thigh side portion 11S to the area of the thigh side portion 11S in each half 11h is referred to as the side porosity.
Here, the “area of the lower thigh intermediate portion 11M” on the horizontal projection plane refers to the area of the entire region defined by the outer edge of the lower thigh intermediate portion 11M on the horizontal projection surface, including the area occupied by the hole 51. There is. Similarly, the “area of the lower thigh center portion 11C” on the horizontal projection plane refers to the area of the entire region defined by the outer edge of the lower thigh center portion 11C on the horizontal projection plane, including the area occupied by the hole 51. There is. Similarly, the “area of the thigh side portion 11S” on the horizontal projection plane refers to the area of the entire region defined by the outer edge of the thigh center portion 11C on the horizontal projection plane, including the area occupied by the hole 51. There is.
The “total area of the holes 51 in the thigh intermediate portion 11M” on the horizontal projection plane is the total area of the holes 51 arranged in the thigh intermediate portion 11M on the horizontal projection surface. Similarly, the "total area of the holes 51 of the thigh center portion 11C" on the horizontal projection plane is the total area of the holes 51 arranged on the thigh center portion 11C on the horizontal projection plane. Similarly, the “total area of the holes 51 of the thigh side portion 11S” on the horizontal projection surface is the total area of the holes 51 arranged on the thigh side portion 11S on the horizontal projection surface. The hole 51 on the horizontal projection plane is the area of the hole 51 at the position where the diameter becomes maximum when the diameter of the hole 51 changes in the depth direction.
Since the intermediate porosity on the horizontal projection plane of the seating portion 10 is higher than both the center porosity and the side porosity, the thigh intermediate portion 11M is made softer than both the thigh center portion 11C and the thigh side portion 11S. can do. For example, when the seat pad 1 (cushion pad 1a) is installed in the driver's seat, the thigh intermediate portion 11M is a portion where the thigh of the seated person easily abuts when the seated person (driver) is seated. Therefore, the seated person sitting on the seating portion 10 can easily move his/her thigh, and the driving operation becomes easy. Therefore, the operability of the seat pad 1 can be improved. Further, since the intermediate void ratio is higher than both the center void ratio and the side void ratio, the thigh center portion 11C and the thigh side portion 11S can be made harder than the thigh intermediate portion 11M, so that the sitting portion When the seated person sitting on the seat 10 rolls, it is possible to enhance the holdability for supporting the thigh of the seated person, and thus to improve the riding comfort.
Further, by increasing the intermediate porosity, in addition to improving operability and riding comfort, it is possible to reduce the weight of the seat pad 1 (cushion pad 1a). Reducing the weight of the cushion pad 1a leads to an improvement in fuel consumption of the vehicle, which leads to energy saving.
Further, when the hole 51 has no bottom, when the hole 51 is not arranged, or when the hole 51 has a bottom, it is possible to improve the air permeability and reduce the heat storage property. The improved breathability and reduced heat storage of the cushion pad 1a lead to improved effectiveness of the air conditioner in the vehicle and eventually to energy saving.
In addition, when the hole 51 has a bottom that opens to the upper surface US, compared with the case where the hole 51 has a bottom that opens to the back surface BS, the portion contacting the thigh of the seated person is more likely to bend, and The operation of driving becomes easy.
Further, according to the present embodiment, even if the seat pad 1 is installed on a seat other than the driver's seat, the seated person sitting on the seating portion 10 easily moves his/her thigh. Moreover, when the seated person rolls, the holdability of supporting the thighs of the seated person can be enhanced, and the riding comfort can be improved.

In the example of FIG. 2, the holes 51 are arranged only in the thigh intermediate portion 11M in one or both half portions 11h in the left-right direction (both in this example) with the center line C in the left-right direction as a boundary. That is, the hole 51 is disposed between the first left/right direction position C1 and the second left/right direction position C2. In other words, the left-right inner end 511 of the hole 51 in which the left-right inner end 511 is located on the innermost side in the left-right direction among the one or more holes 51 is the first left-right position C1 or the first left-right position C1. Located on the outside. In addition, the left-right direction outer end 512 of the hole 51 in which the left-right direction outer end 512 is located on the outermost side in the left-right direction of the one or more holes 51 is located inside the second left-right direction position C2 or the second left-right direction position C2. To position.
For example, the region from the center line C in the left-right direction to each end in the left-right direction in the lower thigh 11 is defined as a half part 11h, and specifically, from the center line C in the left-right direction to the end in the left direction in the lower thigh 11. When the region is the left half 11hl and the region from the left-right centerline C in the lower thigh 11 to the right end is the right half 11hr, the hole 51 is formed in both the left half 11hl and the right half 11hr. It is arranged only in each of the thigh intermediate portions 11M. In the example of FIG. 2, more specifically, six holes 51 arranged in two columns and three rows are arranged in the thigh intermediate portion 11M in the left half 11hl, and the thigh intermediate portion in the right half 11hr is arranged. Six holes 51 arranged in two columns and three rows are arranged in 11M. However, the hole 51 is not limited to this, and the hole 51 may be arranged only in one of the left half portion 11hl and the right half portion 11hr, for example, one corresponding to the leg used in the driving operation by the seated person.
In the example of FIG. 2, the hole 51 is arranged only in the thigh intermediate portion 11M. That is, the hole 51 is not arranged in the lower thigh center portion 11C and the lower thigh side portion 11S. Therefore, the center porosity and the side porosity are both 0, and the intermediate porosity is higher than both the center porosity and the side porosity.
As a result, the lower thigh center portion 11C and the lower thigh side portion 11S can be made harder than the lower thigh intermediate portion 11M, so that when the seated person sitting on the seating portion 10 rolls laterally, It is possible to enhance the holdability that supports the parts, which in turn improves the riding comfort.

FIG. 4 is a plan view showing a state in which a modified example of the cushion pad 1a of FIG. 1 is viewed from above. In the modification of FIG. 4, in one or both of the left-right directions (both in this example) 11h in the left-right direction with the center line C in the left-right direction as a boundary, the holes 51 are 20 mm outward in the left-right direction from the center line C in the left-right direction. It is arranged only between a position spaced apart from each other by a distance of 130 mm from the center line C in the left-right direction in the lateral direction. In the example of FIG. 4, more specifically, the left-right direction inner end 511 of the hole 51 in which the left-right direction inner end 511 is located on the innermost side in the left-right direction out of the one or more holes 51, It is arranged at a position separated by 20 mm outward in the direction. Further, the left-right outer end 512 of the hole 51, in which the left-right outer end 512 is located on the outermost left-right direction of the one or more holes 51, is located at a position separated from the left-right centerline C by 130 mm in the left-right direction. It is arranged. In the example of FIG. 4, the holes 51 are arranged in both the left half portion 11hl and the right half portion 11hr. However, the hole 51 is not limited to this, and the hole 51 may be arranged only in one of the left half portion 11hl and the right half portion 11hr, for example, one corresponding to the leg that moves in response to the driving operation by the seated person.
As described above, the first lateral position C1 is spaced from the lateral centerline C by 30 mm on both sides in the lateral direction, and the second lateral position C2 is spaced from the lateral centerline C by 120 mm on both sides in the lateral direction. In this case, the hole 51 is also arranged at least partially in a region other than the thigh intermediate portion 11M. Specifically, as in the example of FIG. 4, at least a part of one or a plurality of holes 51 of the plurality of holes 51 may be arranged in the thigh center portion 11C. Further, at least a part of one or a plurality of holes 51 of the plurality of holes 51 may be arranged in the thigh side portion 11S. Also in this case, the holes 51 are arranged so that the intermediate void ratio is higher than both the center void ratio and the side void ratio in one or both of the left and right half portions with the horizontal center line C as a boundary. Has been done.
As a result, the lower thigh center portion 11C and the lower thigh side portion 11S can be made harder than the lower thigh intermediate portion 11M, so that when the seated person sitting on the seating portion 10 rolls laterally, It is possible to enhance the holdability that supports the parts, which in turn improves the riding comfort.

In the example of FIG. 4, the left-right inner end 511 is located on the innermost side in the left-right direction among the one or more holes 51 in one or both half portions 11h in the left-right direction with the center line C in the left-right direction as a boundary. The left-right inner end 511 of the hole 51 is at a position spaced apart from the left-right centerline C by 20-40 mm outward in the left-right direction. Further, the left-right outer end 512 of the hole 51, in which the left-right outer end 512 is located at the outermost left-right direction out of the one or more holes 51, is separated from the left-right center line C by 110 to 130 mm in the left-right direction. In position.
As a result, the left-right inner end 511 is arranged at a position separated from the left-right centerline C by more than 40 mm (for example, by 60 mm), and/or the left-right outer end 512 is smaller than 110 mm from the left-right centerline C ( For example, the seating portion 10 is more likely to bend near the end portion in the left-right direction in the portion where the thigh portion of the seated person is likely to contact, as compared with the case where the seating portion 10 is disposed between the seat portion 70 and the separated position. Therefore, it is possible to avoid the feeling that the movement of the thigh due to the operation of the leg is disturbed near the end. Therefore, it is possible to improve the operability in the driving operation by the seated person's legs.

As in the example of FIGS. 2 and 4, in the horizontal projection plane, the area of the thigh intermediate portion 11M in the left half half 11h (for example, the left half 11hl) with the horizontal center line C as a boundary. The ratio of the total area of the holes 51 in the thigh intermediate portion 11M to the ratio of the total area of the holes 51 in the thigh central portion 11C to the area of the thigh central portion 11C, and the one half 11h It is higher than any of the ratios of the total area of the holes 51 in the thigh side portion 11S to the area of the thigh side portion 11S. Further, in the horizontal projection plane, the thigh middle part on the other half 11h in the left-right direction with the center line C in the left-right direction as a boundary (the half half 11h on one side is the left half 11hl, the right half 11hr) The ratio of the total area of the holes 51 in the thigh intermediate portion 11M to the area of the part 11M is the ratio of the total area of the holes 51 in the thigh central portion 11C to the area of the thigh central portion 11C, and It is higher than any of the ratios of the total area of the holes 51 in the thigh side portion 11S to the area of the thigh side portion 11S in the half portion 11h. However, the present invention is not limited to this, and for example, the intermediate porosity in the right half 11hr is higher than both the center porosity and the side porosity in the right half 11hr, and the intermediate porosity in the left half 11hl is equal to the center porosity. The porosity may be equal to or lower than the side porosity in the left half 11hl. Further, for example, the intermediate porosity in the left half 11hl is higher than both the center porosity of and the side porosity in the left half 11hl, and the intermediate porosity in the right half 11hr is the center porosity, or It may be less than or equal to the side porosity in the right half portion 11 hr.
However, from the viewpoint of operability in the driving operation by the seated person, the intermediate porosity may be higher than both the center porosity and the side porosity in at least the half 11h corresponding to the leg used for the driving operation. preferable. As a result, the seated person can easily move the thigh of the person used for the driving operation, which facilitates the driving operation and supports the thigh of the sitting person when the seated person rolls. Holdability can be improved, and ride comfort can be improved.

Like the example of FIGS. 2 and 4, the bottom 52 of the seating portion 10 may also be provided with a hole 52 that is a bottomless or bottomed hole. The holes 52 may not be arranged in the lower hip portion 12. When the holes 52 are arranged in the lower lower part 12, the arrangement and size of the holes 52 are arbitrary. “Unbottomed” with respect to the hole 52 means that the hole 52 is a through hole, that is, that the hole 52 penetrates the seating portion 10. Further, regarding the hole 52, “bottomed” means that the hole 52 is a dent, that is, one end of the hole 52 is opened on any surface (top surface US or back surface BS) of the seating portion 10. In addition, the other end (bottom portion) of the hole 52 does not open on the surface opposite to the open surface of the seating portion 10, but ends inside the seating portion 10.
When the hole 52 is arranged in the lower hip 12, the seated person is more likely to be deformed along the hip of the seated person when compared with the case where the hole 52 is not arranged in the lower buttocks 12 to provide a comfortable ride. Can be improved. Further, when the holes 52 are arranged in the lower buttocks 12, the weight of the cushion pad 1a can be reduced as compared with the case where the holes 52 are not arranged in the lower buttocks 12. Further, when the hole 52 arranged in the lower hip portion 12 is a bottomless hole, as compared with the case where the hole 52 is not arranged in the lower hip portion 12 or the hole 52 is a bottomed hole, the breathability of the cushion pad 1a is higher. It is possible to improve the heat dissipation and reduce the heat storage property. In each of the examples described in this specification, when the lower hip 12 has a bottomed hole 52, the depth (vertical length) of the hole 52 is the thickness of the lower hip 12 (vertical length). 30% or more and less than 100% is preferable.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the lower thigh 11 includes one or a plurality of large holes 51L and one or a plurality of small holes 51S each having an area smaller than that of the one or a plurality of large holes 51L in the horizontal projection plane. Different from the first embodiment. The other configurations are similar to those of the first embodiment, and thus the description thereof will be omitted. The “large hole 51L” refers to a hole having a relatively large area on the horizontal projection plane with respect to the area of the small hole 51S.
The area of the one or the plurality of large holes 51L on the horizontal projection surface is larger than the area of the one or the plurality of small holes 51S on the horizontal projection surface. When the lower thigh 11 includes a plurality of large holes 51L, the areas of the plurality of large holes 51L on the horizontal projection plane may be the same or different from each other. When the lower thigh 11 includes a plurality of small holes 51S, the areas of the plurality of small holes 51S on the horizontal projection plane may be the same or different from each other.
FIG. 5 is a plan view showing a state when the cushion pad 1a of the vehicle seat pad 1 according to the second embodiment of the present invention is viewed from above. FIG. 6 is a cross-sectional view taken along the line AA of the cushion pad 1a shown in FIG. 5, taken along the line AA of FIG.
In the example of FIGS. 5 and 6, the large hole 51L is arranged only in the thigh intermediate portion 11M. That is, the large hole 51L is arranged between the first left/right direction position C1 and the second left/right direction position C2. In other words, the left-right inner end 511L of the large hole 51L in which the left-right inner end 511L is located most inward in the left-right direction among the one or more large holes 51L is the first left-right position C1 or the first left-right position C1. It is located outside. Moreover, the left-right direction outer end 512L of the large hole 51L in which the left-right direction outer end 512L is located on the outermost side in the left-right direction of the one or more large holes 51L is located inside the second left-right direction position C2 or the second left-right direction position C2. It is arranged.
In the example of FIG. 5, the large holes 51L are arranged in both the left half 11hl and the right half 11hr. Specifically, six large holes 51L arranged in 2 columns and 3 rows are arranged in the lower thigh intermediate portion 11M in the left half portion 11hl, and arranged in 2 columns and 3 rows in the lower thigh intermediate portion 11M in the right half portion 11hr. The six large holes 51L formed are arranged. However, the invention is not limited to this, and the large hole 51L may be arranged only in one of the left half portion 11hl and the right half portion 11hr, for example, the one corresponding to the leg used for the driving operation by the seated person.
As a result, it is possible to make the thigh center portion 11C and the thigh side portion 11S harder than the thigh intermediate portion 11M as compared with the case where the large hole 51L is arranged in the thigh center portion 11C and the thigh side portion 11S. As a result, when the seated person sitting on the seating portion 10 rolls, it is possible to enhance the holdability of supporting the thigh portion of the seated person, and thus to improve the riding comfort.

In the example of FIG. 5, small holes 51S are arranged in the thigh center portion 11C and the thigh side portion 11S. Specifically, three small holes 51S arranged in one row and three rows straddling the center line C in the left-right direction are arranged in the lower thigh center portion 11C. Further, three small holes 51S arranged in one row and three rows are arranged in each of the lower thigh side portion 11S in the left half portion 11hl and the lower thigh side portion 11S in the right half portion 11hr.
As a result, the rigidity difference between the lower thigh intermediate portion 11M and the lower thigh center portion 11C and the lower thigh side portion 11S is smaller than that in the case where the small hole 51S is not provided in the lower thigh center portion 11C and the lower thigh side portion 11S. can do. Therefore, when the thigh of the seated person is displaced from the thigh intermediate portion 11M to the thigh center portion 11C or the thigh side portion 11S, it is possible to reduce the discomfort to the thigh due to the difference in rigidity.
Not limited to this example, the small hole 51S may be arranged in either the thigh center portion 11C or the thigh side portion 11S. The small hole 51S may be arranged also in the thigh intermediate portion 11M.
As a result, the cushion pad 1a can be made lighter than in the case where the small holes 51S are not arranged. Further, when the small hole 51S is a bottomless hole, when the small hole 51S is not arranged, or when the small hole 51S has a bottom, it is possible to improve the air permeability and reduce the heat storage property.

In the example of FIG. 5, the pitch interval p51 in the anteroposterior direction of the plurality of large holes 51L in the thigh intermediate portion 11M is the pitch interval p52 in the anteroposterior direction of the small holes 51S in the thigh central portion 11C and the small holes 51S in the thigh side portion 11S. Is substantially equal to the pitch interval p52 in the front-back direction. The “pitch interval” is the interval between the centers of a pair of holes that are adjacent to each other in the front-rear direction on the horizontal projection plane. Thereby, the intermediate porosity can be made higher than both the center porosity and the side porosity. However, without being limited to this example, the pitch interval p51 in the front-rear direction may be different from the pitch interval p52 in the front-rear direction. In this case, the pitch interval p51 and the pitch interval p52 in the front-rear direction are set so that the intermediate porosity is higher than either the center porosity or the side porosity in view of the areas of the large holes 51L and the small holes 51S on the horizontal projection plane. To be done.

FIG. 7 is a plan view showing a modification of the cushion pad 1a of FIG. 5 when viewed from above. In the example of FIG. 7, the large hole 51L is separated from the left-right center line C by 20 mm in the left-right direction and the left-right center in one or both of the left and right half portions with the left-right center line C as a boundary. It is arranged only between the line C and the position separated by 130 mm outward in the left-right direction. In the example of FIG. 7, more specifically, the left-right direction inner end 511L of the large hole 51L in which the left-right direction inner end 511L is located on the innermost side in the left-right direction among the one or more large holes 51L is the left-right center line C It is arranged at a position separated by 20 mm outward in the direction. Further, the left and right outer ends 512L of the large hole 51L, in which the left and right outer ends 512L are located on the outermost left and right sides of the one or more large holes 51L, are separated from the left and right centerline C by 130 mm in the left and right direction. It is arranged. In the example of FIG. 7, the large holes 51L are arranged in both the left half 11hl and the right half 11hr. However, the present invention is not limited to this, and the large hole 51L may be arranged only in one of the left half portion 11hl and the right half portion 11hr, for example, the one corresponding to the leg used in the driving operation by the seated person.
As described above, the first lateral position C1 is spaced from the lateral centerline C by 30 mm on both sides in the lateral direction, and the second lateral position C2 is spaced from the lateral centerline C by 120 mm on both sides in the lateral direction. In this case, the large hole 51L is also arranged at least partially in the region other than the thigh intermediate portion 11M. Specifically, as in the example of FIG. 7, at least a part of one or a plurality of large holes 51L of the plurality of large holes 51L may be arranged in the thigh center portion 11C. Further, at least a part of one of the plurality of large holes 51L or the plurality of large holes 51L may be arranged in the thigh side portion 11S. Also in this case, in one or both half portions 11h in the left-right direction with the center line C in the left-right direction as a boundary, the large hole 51L has an intermediate porosity higher than both the center porosity and the side porosity. It is arranged.
As a result, the lower thigh center portion 11C and the lower thigh side portion 11S can be made harder than the lower thigh intermediate portion 11M. Therefore, when the seated person sitting on the seating portion 10 rolls, the thighs of the seated person can be rolled. It is possible to enhance the holdability that supports the parts, which in turn improves the riding comfort.
Also in the example of FIG. 7, small holes 51S are arranged in the lower thigh center portion 11C and the lower thigh side portion 11S. Specifically, three small holes 51S arranged in one row and three rows straddling the center line C in the left-right direction are arranged in the lower thigh center portion 11C. Further, three small holes 51S arranged in one row and three rows are arranged in each of the lower thigh side portion 11S in the left half portion 11hl and the lower thigh side portion 11S in the right half portion 11hr.
As a result, the rigidity difference between the lower thigh intermediate portion 11M and the lower thigh center portion 11C and the lower thigh side portion 11S is smaller than that in the case where the small hole 51S is not provided in the lower thigh center portion 11C and the lower thigh side portion 11S. can do. Therefore, when the thigh of the seated person is displaced from the thigh intermediate portion 11M to the thigh center portion 11C or the thigh side portion 11S, it is possible to reduce the discomfort to the thigh due to the difference in rigidity.
Not limited to this example, the small hole 51S may be arranged in either the thigh center portion 11C or the thigh side portion 11S. The small hole 51S may be arranged also in the thigh intermediate portion 11M.
In the example of FIG. 7, as in the example of FIG. 4, the small hole 51S has a laterally inner side at a position separated from the lateral centerline C by 20 mm to the laterally outer side and a lateral hole 130 mm from the lateral centerline C to the laterally outer side. It is arranged only on the outside in the left-right direction of the position separated by only. As a result, the same operational effect as the example of FIG. 4 is achieved.

Further, in the example of FIG. 7, in one or both of the left and right directions (both sides in this example) in the left and right direction with the center line C in the left and right direction as a boundary, the left and right are most inwardly in the left and right direction among the one or more large holes 51L. The left-right direction inner end 511L of the large hole 51L in which the direction-direction inner end 511L is located is at a position separated from the left-right direction centerline C by 20 to 40 mm outward in the left-right direction. Further, the left and right outer ends 512L of the large hole 51L, in which the left and right outer ends 512L are located at the outermost left and right direction among the one or more large holes 51L, are separated from the left and right centerline C by 110 to 130 mm in the left and right direction. In position. In this case, for example, the left and right inner ends 511L and the left and right outer ends 512L of the one or the plurality of large holes 51L that are the innermost in the left and right direction are spaced apart from each other by more than 40 mm (for example, 60 mm) and less than 110 mm (for example, 60 mm). , 70 mm), the seating portion 10 is more likely to bend near the left and right ends of the portion where the thigh of the seated person is likely to contact. Therefore, it is possible to avoid the feeling that the movement of the thigh due to the operation of the leg is hindered near the end. Therefore, when the seated person is a driver, operability can be improved.

Further, from the viewpoint of improving operability and riding comfort, it is preferable that the shapes and/or the arrangement patterns of the holes 51, the large holes 51L, and the small holes 51S on the horizontal projection plane are symmetrical with respect to the center line C in the left-right direction. Is.
The shape of the hole 51, the large hole 51L, and the small hole 51S on the horizontal projection plane is a circle (a perfect circle) in the example of the figure, but other than that, for example, an ellipse, a triangle, a quadrangle, a rhombus, a trapezoid, etc. It may be polygonal or the like.

As a method of forming the hole 51, the large hole 51L, and the small hole 51S in the seat portion 10, for example, an upper mold for molding the back surface BS of the cushion pad 1a in a mold for foam-molding the cushion pad 1a, A projection is provided on at least one molding surface of the lower mold for molding the upper surface US of the cushion pad 1a, and a hole is formed by the peripheral surface of the projection in a state where the upper mold and the lower mold are combined. A method of forming 51, the large hole 51L, and the small hole 51S is suitable.
However, the hole 51, the large hole 51L, and the small hole 51S may be formed by a method different from this.

The vehicle seat pad of the present invention can be used for any type of vehicle. Further, the vehicle seat pad of the present invention is particularly suitable for use in the driver's seat.

1: Vehicle seat pad (seat pad),
1a: cushion pad, 10: seated portion (main pad portion), 11: lower thigh, 11h: half, 11hl: left half, 11hr: right half,
12: Lower butt,
20: side pad part, 30: back pad facing part, 40a, 40b, 40c: groove, 1b: back pad,
51, 52: hole, 51L: large hole, 51S: small hole,
100: Vehicle seat, 101: Skin, 102: Headrest,
511, 511L: left and right direction inner end, 512, 512L: left and right direction outer end B: front and rear boundary position, T: frontmost end position, US: upper surface, BS: back surface,
C: left-right center line, C1: first left-right position,
C2: Second lateral position 11C: Thigh center part, 11M: Thigh middle part, 11S: Thigh side part p51, p52: Pitch interval

Claims (8)

A vehicle seat pad, which is formed of a resin foam and has a seating portion for supporting a seated person,
Of the seating portion, a front portion is a lower thigh than a front-rear direction position separated by a length of 45% of the entire length of the seating portion in the front-rear direction from the frontmost end position of the seating portion,
Of the lower thigh, a pair of left and right first left and right sides separated by 7.5% of the total length of the lower thigh in the left-right direction from the center line in the left-right direction of the seating portion. The part inside the left-right direction from the direction position is the thigh center part,
Of the lower thigh, the pair of first left and right positions, and a pair of second left and right directions separated from the left and right centerlines by 30% of the total length of the lower thigh in the left and right direction. The portion between the position and the middle thigh of the pair of thighs,
When portions of the lower thigh on the left and right sides of the pair of second left and right positions are defined as a pair of lower thigh side portions,
The lower thigh has one or more bottomless or bottomed holes,
In the horizontal projection plane, the ratio of the total area of the holes in the thigh intermediate portion to the area of the thigh intermediate portion in at least one half in the left-right direction with the horizontal center line as a boundary is The ratio of the total area of the holes in the lower thigh center portion to the area of the lower center portion, and the total area of the holes in the lower thigh side portion with respect to the area of the lower thigh side portion in the one half portion. Higher than any of the ratios of vehicle seat pads. On the horizontal projection plane, the ratio of the total area of the holes in the thigh intermediate portion to the area of the thigh intermediate portion in one half in the left and right direction with the horizontal center line as a boundary is The ratio of the total area of the hole in the thigh center portion to the area of the center portion, and the total area of the holes in the thigh side portion with respect to the area of the thigh side portion in the one half portion. Higher than any of the ratios,
On the horizontal projection plane, the ratio of the total area of the holes in the thigh intermediate portion to the area of the thigh intermediate portion in the other half in the left and right direction with the horizontal center line as a boundary is Ratio of the total area of the hole in the lower thigh center portion to the area of the lower center portion, and the total area of the hole in the lower thigh side portion with respect to the area of the lower thigh side portion in the other half portion. The vehicle seat pad according to claim 1, which is higher than any of the above ratios. In one or both half parts in the left-right direction with the center line in the left-right direction as a boundary,
The vehicle seat pad according to claim 1 or 2, wherein the hole is arranged only in the thigh intermediate portion. In one or both half parts in the left-right direction with the center line in the left-right direction as a boundary,
The hole is arranged only between a position spaced apart from the left-right direction center line by 20 mm in the left-right direction and a position spaced apart by 130 mm in the left-right direction from the left-right direction center line. Or the vehicle seat pad according to 2. In one or both half parts in the left-right direction with the center line in the left-right direction as a boundary,
The left-right inner end of the hole in which the left-right inner end is positioned most inward in the left-right direction among the one or more holes is at a position spaced apart from the left-right centerline by 20 to 40 mm outward in the left-right direction. ,
The left and right outer ends of the hole, of which the left and right outer ends are located on the outermost left and right in the one or more holes, are located 110 to 130 mm apart from the left and right centerline to the left and right outer sides. The vehicle seat pad according to claim 4. In one or both half parts in the left-right direction with the center line in the left-right direction as a boundary,
The lower thigh has a plurality of the holes,
The plurality of holes comprises one or more large holes and one or more small holes each having a smaller area in the horizontal projection plane than the one or more large holes,
The vehicle seat pad according to claim 1 or 2, wherein the large hole is arranged only in the lower thigh intermediate portion. In one or both half parts in the left-right direction with the center line in the left-right direction as a boundary,
The lower thigh has a plurality of the holes,
The plurality of holes comprises one or more large holes and one or more small holes each having a smaller area in the horizontal projection plane than the one or more large holes,
The large hole is arranged only between a position spaced apart from the left-right direction center line by 20 mm in the left-right direction and a position spaced apart by 130 mm in the left-right direction from the left-right direction center line. Or the vehicle seat pad according to 2. In one or both half parts in the left-right direction with the center line in the left-right direction as a boundary,
The left-right inner end of the large hole, of which the left-right inner end is located most inward in the left-right direction among the one or more large holes, is at a position spaced apart from the left-right centerline by 20 to 40 mm outward in the left-right direction,
Out of the one or more large holes, the left and right outer ends of the large hole whose left and right outer ends are located on the outermost left and right direction are located 110 to 130 mm away from the left and right centerline in the left and right direction. The vehicle seat pad according to claim 7.

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