WO2003043847A1

WO2003043847A1 - Adjuster stop for a vehicle seat in particular an inclination adjuster stop for the backrest thereof

Info

Publication number: WO2003043847A1
Application number: PCT/EP2002/011301
Authority: WO
Inventors: Dieter Lange
Original assignee: Faurecia Autositze Gmbh & Co. Kg
Priority date: 2001-11-22
Filing date: 2002-10-09
Publication date: 2003-05-30
Also published as: DE10157273B4; DE10157273A1

Abstract

The invention relates to an adjuster stop for a vehicle seat, in particular an inclination adjuster stop for the backrest thereof, whereby a fixed stop piece (1) provided on a fixed seat region, is connected by means of an eccentric (4), to a stop piece (2), adjustable by rotation, provided on a moving seat region. The eccentric piece (4c; 4d; 4e; 4f,) mounted in the second rotating bearing (1b) comprises two counter-moving wedge-shaped slide pieces (4c; 4d), curved around the rotating axis (3) with external and internal circumference contours. A spring (5) is provided to displace the slide pieces (4c, 4d) against each other in the circumferential direction. The region of the eccentric piece is formed by the slide pieces (4c; 4d) and two discs (4e; 4f) supported against each other by means of the spring (5) and which may rotate about the rotation axis (3). The discs comprise recesses (4h; 4i) which are separate from each other and formed by radially extending web regions (4g), in which the slide pieces (4c; 4d) are arranged. The recesses (4h; 4i) comprise curved bases (4k; 4l) corresponding to the adjacent circumferential contours of the slide pieces (4c; 4d), embodied to form an enclosure.

Description

ADJUSTMENT FITTING FOR A MOTOR VEHICLE SEAT, IN PART. INCLINATION FITTING FOR ITS BACKREST

TECHNICAL AREA

The invention relates to an adjustment fitting according to the preamble of patent claim 1.

STATE OF THE ART

In a known adjustment fitting of this type (DE 199 38 666 AI), the partially interlocking toothings of a gear, which is also referred to as a wobble gear, are kept free of play by wedge-shaped sliders which are biased by a spring in the direction of greater eccentricity. So that the adjustment of the fitting does not become stiff as a result, the wedge pieces have to be moved against the force of the spring in an opposite direction when the adjustment fitting is actuated. In order to create a play-free and quickly releasable device, the sliders must lie on the circumferential eccentric in precisely defined areas on both sides of the eccentric peak. There is therefore only a line contact between the eccentric and the slider. The resulting high surface pressure during eccentric adjustment leads to wear of the contact areas, which means that the backlash of the tooth mesh cannot be guaranteed in the long run. In a further known adjustment fitting with a wobble mechanism (DE 694 08 496 T2), the driven eccentric area is formed by two eccentric disks which can be pivoted relative to one another about the axis of rotation under the action of a spring. Both eccentric discs lie with their outer peripheral surfaces directly in two spaced lines on the associated bearing. This construction is therefore also sensitive to wear.

THE INVENTION

On the basis of this prior art, the invention is based on the object of designing an adjustment fitting of the type presumed to be known in such a way that it is designed to be rotatably insensitive to wear and rattling-free.

This object is achieved with the features of patent claim 1.

In the proposed solution, a full-surface contact is made both with the circumferential contour of the sliding pieces on the bearing surface of a rotary bearing and between a disk and one sliding piece in each case. This reduces the stress on the friction pairings. In addition, a relative movement for the elimination of play for one slide piece only takes place between a contour of the slide pieces and the bottoms of the recesses, while the fitting locking Position caused a movement between the other contour of the slider and the associated pivot bearing surface. This division of functions into different areas of the eccentric also reduces wear and contributes to increasing functional reliability.

Preferred embodiments of the invention result from the subclaims.

BRIEF DESCRIPTION OF THE DRAWING FIGURE

Two preferred embodiments of the invention are described in detail with reference to the drawings. Show it:

Figure 1 - an exploded perspective view of an adjustment fitting; Figure la - the exploded view of Figure 1 in a second viewing direction;

Figure 2 shows a section along a vertical plane through the backrest-fixed fitting part of the adjustment fitting according to Figure 1 with an eccentric in the non-actuated state. Figure 3 - an enlarged section of the eccentric area of the adjustment fitting according to Fig. 2; FIG. 4 - the detail according to FIG. 3 without the pane lying at the front or at the top in FIG. 3; 5 shows a representation corresponding to FIG. 1 of a second embodiment; Figure 5a - a Fig la corresponding representation of the second embodiment; Figure 6 - a representation corresponding to Figure 2 of the second embodiment; FIG. 7 - a representation corresponding to FIG. 3 of the second embodiment; Figure 8 - a Fig. 4 corresponding representation of the second embodiment.

BEST WAY TO CARRY OUT THE INVENTION

In the drawings, the same or corresponding elements are each provided with the same reference numerals, which are supplemented with a prime if necessary in the representations of the second embodiment.

The adjustment fitting shown is in principle a typical inclination adjustment fitting for a backrest of a motor vehicle seat. It has a fixed fitting part 1, which is connected to a seat part, not shown, and a rotationally adjustable fitting part 2, which is connected to the backrest, also not shown.

The fitting part 1 has a toothing la, which is intended for circumferential engagement in a toothing 2a of the movable fitting part 2. The toothing la is an external toothing while the toothing 2a is designed as an internal toothing. Both gears la and 2a are part of a wobble mechanism. The fitting part 2 has a rotary bearing 2b, which is formed by the circular cylindrical inner surface of a passage or collar 2d, the circular cylindrical outer surface of which is designated 2c. A bearing part 4a of an eccentric 4 with its outer diameter 4r is rotatably mounted in the rotary bearing 2b about an axis of rotation 3. The bearing part 4a passes through the fitting part 2 with a bearing pin 4b with which a locking disk 6 is riveted. On the outer diameter 4r of the bearing part 4a, two disks 4e and 4f are pivotally mounted with a bearing bore 4p, which are penetrated with play in recesses 4q by two driver pins 4m formed on the bearing part 4a, so that the bearing part 4a is one compared to the disks 4e and 4f small angle is rotatable.

On the outer circumference of the disks 4e and 4f, two further recesses 4h and 4i are provided, in which sliders 4c and 4d are received. Both between the recesses 4i and 4h and between these and the recesses 4q for the driver pins 4m there remain web areas 4g, with which the disks 4e and 4f are guided with play in a bearing ring 7, which forms a rotary bearing 1b on the fitting part 1. The bearing ring 7 only serves to improve the sliding properties and is therefore omitted in the following drawings of the first embodiment.

The disks 4e and 4f together with the sliding pieces 4c and 4d form an eccentric part with their outer circumference, which the toothings la and 2a in the direction of its eccentric the highest point engages. The disks 4e and 4f each have a recess extending from the bearing bore 4p, into which the bent ends of an annular spring 5 engage, which is held on the bearing part 4a by means of a spring receptacle 8 and is designed as an expansion spring. Each end of the spring 5 bears on a counter surface 4o of one of the disks 4e and 4f, so that they are biased in the circumferential direction opposite to one another.

The sliders 4c and 4d are wedge-shaped. They are arranged in the recesses 4h and 4i in such a way that their narrow end faces face one another. The outer contour of the sliders 4d and 4c has the same radius as the pivot bearing Ib. As can be seen in particular from FIG. 4, in which only the disk 4f adjacent to the spring 5 is shown, the slider 4d is received in the recess 4i, which has a greater length than the slider 4d. The slider 4d has an inner contour with the same radius as the bottom 41. The slider 4d can move in the circumferential direction relative to the recess 4i without losing full-surface contact with the bottom 41.

The slider 4.c is received in the recess 4h, which has a length corresponding to the slider 4c. When the outer circumference of the slider 4c rests on the rotary bearing 1b, its inner contour is at a distance from the bottom 4k of the recess 4h. The webs 4g delimiting the recess 4h are constantly on counter surfaces 4n of the slider 4c. A displacement of the slider 4c in the circumferential direction is therefore only possible together with the disk 4f. However, this allows a slight radial displacement of the slider 4c.

The disc 4e is designed as a mirror image of the disc 4f, so that the slider 4c is displaceable in the circumferential direction in the recess 4i, but is held against the bottom 41. Accordingly, the slider 4d in the disc 4e is held non-displaceably in the circumferential direction.

In the unactuated state of the adjustment fitting, the disks 4e and 4f are held against one another by the spring 5 in the opposite direction. The disc 4f is thus rotated clockwise and the disc 4e is rotated counterclockwise. The slider 4d is pushed radially outward over the bottom 41 of the disk 4f, which extends inclined to the inner surface of the rotary bearing 1b, and the slider 4c over the oppositely inclined bottom 41 of the disk 4e. In the unactuated state, the sliders 4c and 4d are at a relatively large distance from one another. As a result, the eccentricity of the eccentric area is increased and the toothings la and 2a are pressed into one another without play.

When the adjustment fitting is actuated, for example counterclockwise, the disk 4f is carried along by the driver pins 4m, while the disk 4e does not yet come into contact with the driver pins 4m. The distance between the web area 4g delimiting the recess i and the wide end of the wedge shaped slider 4d delimiting mating surface 4n. The floor 41, which is inclined to the inner surface of the pivot bearing 1b, correspondingly shifts in the circumferential direction. The slider 4d, which is held immovably by the disk 4e as a result of the force of the spring 5, reaches a region of the recess 4i in which it is no longer pressed against the rotary bearing 1b.

At the same time, the slider 4c held immovably in the recess 4h in the circumferential direction is carried along by the disk 4f. It slides over the bottom 41 of the disc 4e, which is inclined to the pivot bearing and against which it rests, to enlarged regions of the recess 4i. This reduces the eccentricity of the eccentric area and the toothings la and 2a are only kept in engagement with play.

With a further rotation of the eccentric 4 with driver pins 4m lying against both the disk 4e and the disk 4f, the eccentric peak point moves counterclockwise all around and adjusts the fitting parts 1 and 2 by the different number of teeth of their toothings la and 2a. The change in the eccentricity and the adjustment of the fitting parts 1 and 2 to one another takes place in an analogous manner when the eccentric 4 is rotated in the opposite direction.

Now to the embodiment according to FIGS. 5 to 8: This embodiment differs from the previously described first embodiment by the displacement of the sliding pieces and the corresponding displacement of the recesses in the disks from a radially outwardly facing position in the first embodiment to a radially inwardly facing position in the second embodiment.

The design of the fixed fitting part 1, the pivotable fitting part 2, the bearing ring 7, the bearing part 4a, also the spring receptacle 8 and the basic structure of the spring 5 is unchanged from the first embodiment. The main differences lie in the components with the same reference numerals, but with the addition of dashes and their bearings:

The driving effect of the disks 4e 'and 4f corresponding to the disks 4e and f of the first embodiment are rotatably mounted on the outer surface 2c of the passage 2d. The curved sliding pieces 4c ¹ and 4d 'with their inner circumferential contours also lie on the entire surface of this outer surface 2c. The sliders 4c 'and 4d' are also wedge-shaped, but face each other with their larger end faces.

The outer circumferential contours of the sliders 4c 'and 4d' lie in recesses 4i 'and 4h' which are open towards the center of rotation and which are provided in each of the two disks 4e 'and 4f'. Each disc 4e 'and 4f' each has a recess 4i 'which is open towards the center and whose Length is greater than the length of the slider received and a recess 4h 'likewise open towards the center, the length of which corresponds to the length of the slider received.

In this solution too, the spring 5, which is supported on contact surfaces 4o 'of the different disks 4e' and 4f ', pivots the disks against one another.

In the two disks 4e 'and 4f'^'there are recesses 4q' in which the driver pins 4m of the bearing part 4a engage. Web areas 4g ¹ separate the different recesses of the disks from one another. The recess 4h 'has a bottom 4k' which, in the non-driven state, lies at a distance from the outer peripheral contour of the slider 4c '. The inner contour of the slider 4c 'lies over the entire surface of the outer surface 2c of the passage 2d. The outer circumferential contour of the slider 4d 'is in full contact with the bottom 41' of the recess 4i 'and the inner contour is in full contact with the outer surface 2c of the passage 2d. The sliders 4c 'and 4d' have end faces which are designed as counter surfaces 4n 'for the adjacent surfaces of the recesses 4i' and 4h '.

The bearing bore 4p 'lies in the unactuated state on the opposite outer surface 2c of the passage 2d. The bearing disks 4e 'and 4f are constantly in contact with their outer surfaces on the second rotary bearing 1b. The webs 4g 'delimiting the recess 4h' are constantly in contact with the counter surfaces 4n 'of the slider 4c'. A displacement of the slider 4c 'in the circumferential direction is therefore only possible together with the disc 4f. However, this allows a slight radial displacement of the slide 4c '.

The disc 4e 'is a mirror image of the disc 4f, so that the slider 4c' is displaceable in the circumferential direction in the recess 4i ', but is held against the bottom 41'. Accordingly, the slider 4d 'is held in the disk 4e' so that it cannot move in the circumferential direction.

In the unactuated state of the adjustment fitting, the disks 4e 'and 4f are held by the spring 5 in an opposite direction to one another. The disc 4e 'is thus rotated clockwise and the disc 4f' is rotated counterclockwise. The slider 4d 'is pushed radially inward over the bottom 41', which extends inclined to the inner surface of the rotary bearing 1b, and the slider 4c 'via the oppositely inclined bottom 41' of the disk 4e '. The sliders 4c 'and 4d' are at a relatively large distance from one another in the unactuated state. As a result, the eccentricity of the eccentric area is increased and the toothings la and 2a are pressed into one another without play.

When actuating the adjustment fitting, for example in

Clockwise, the washer 4f 'is taken along by the driver pins 4m, while the washer 4e' is not yet in contact. tact with the driver pin 4m. This bridges the distance between the web area 4g 'delimiting the recess 4i' and the counter surface 4n 'delimiting the wide end of the wedge-shaped slider 4d'. In this case, the floor 41 ′, which extends inclined to the inner surface of the rotary bearing 1b, correspondingly shifts in the circumferential direction. The slider 4d ', which is held immovably by the disk 4e' as a result of the force of the spring 5, reaches an area of the recess 4i 'in which it is no longer pressed against the outer surface 2c of the rotary bearing 2b.

At the same time, the slider 4c 'held immovably in the recess 4h' in the circumferential direction is carried along by the disk 4f '. It slides over the bottom 41 'of the disc 4e', which is inclined to the pivot bearing 1b, and against which it rests, to enlarged regions of the recess 4i '. This reduces the eccentricity of the eccentric area and the toothings 1a and 2a are only held in engagement with play, with play occurring between the outer surface 2c of the rotary bearing 2b and the bearing bore 4p '.

With a further rotation of the eccentric 4 'with driver pins 4m resting on both the disk 4e' and the disk 4f ', the eccentric peak moves clockwise all around and adjusts the fitting parts 1 and 2 by the different number of teeth of their toothings la and 2a. The eccentricity is changed and the fitting parts 1 and 2 are adjusted relative to each other when hung of the eccentric 4 'in the opposite direction in an analogous manner.

Claims

CLAIMS:

1. Adjustment fitting for motor vehicle seat, in particular inclination adjustment fitting for its backrest, with which fixed fitting part (1) assigned to a fixed seat area and a rotatable adjustable part (2) assigned to a movable seat area via an eccentric (4) which can be rotated about an axis of rotation (3) ; 4 ') is connected to a bearing part (4a) via a first rotary bearing (2b) in a fitting part (2) and to an eccentric part (4c, 4d, 4e, 4f; 4c', 4d ', 4e', 4f ) is mounted in the other fitting part (1) via a second rotary bearing ^' (lb) which is eccentric with respect to the bearing part (4a), both fitting parts (1; 2) having teeth (la; 2a) forming parts of a wobble mechanism, which are radial to the position of the Eccentric high point are in engagement with each other, the eccentric part (4c, 4d, 4e, 4f; 4c ', 4d', 4e ', 4f) bearing in the second rotary bearing (lb) two oppositely wedge-shaped and curved about the axis of rotation (3) sliding pieces (4c ; 4d; 4c ';4d') with outer u nd inner

Has circumferential contours, one of which is designed to bear against an eccentric part region which is connected in a rotationally fixed manner to the driven bearing part (4a) and the other of which is designed to bear against the full surface of a rotary bearing surface of one of the fitting parts (1; 2), a spring (5) being designed to counter each other in the circumferential direction displacement of the sliding pieces (4c; 4d; 4c ';4d') is provided, characterized in that the eccentric part area by the sliding pieces (4c; 4d; 4c '; 4d ') and two disks (4e; 4f; 4e'; 4f) which are rotatable about the axis of rotation (3) and which are supported against one another by means of the spring (5) and which are separated from one another by means of radially extending web regions (4g; 4g ') 4h; 4i; 4h ';4i'), in which the sliding pieces (4c; 4d; 4c ';4d') are arranged, the recesses (4h; 4i; 4h ';4i') corresponding to the adjacent ones to the system formed circumferential contours of the sliders (4c; 4d; 4c ';4d') have curved bottoms (4k; 41; 4k ';41').

2. Adjustment fitting according to claim 1, characterized in that the pivot bearing surface is the bearing surface of the second pivot bearing (lb).

3. Adjustment fitting according to claim 1, characterized in that the pivot bearing surface is a surface (2c) of the rotationally adjustable fitting part (2) arranged concentrically with the first pivot bearing (2b).

4. Adjustment fitting according to at least one of claims 1 to 3, characterized in that the spring (5) is designed as an expansion spring.

5. Adjustment fitting according to at least one of claims 1 to 4, characterized in that that the curved sliders (4c; 4d) face each other with their narrower faces.

6. Adjustment fitting according to at least one of claims 1 to 5, characterized in that the curved sliding pieces (4c '; 4d') face each other with their wider end faces.

7. Adjustment fitting according to at least one of claims 1 to 6, characterized in that the recesses (4h; 4i) are open to the outside.

8. Adjustment fitting according to at least one of claims 1 to 6, characterized in that the recesses (4h '; 4i') are designed to be open towards the inside.

9. Adjustment fitting according to at least one of claims 1 to 8, characterized in that the disks (4e; 4f) are rotatably mounted on the driven bearing part (4a).

10. Adjustment fitting according to at least one of claims 1 to 8, characterized in that the disks (4e '; 4f) are rotatably mounted on the surface (2c) of the rotationally adjustable fitting part (2) arranged concentrically to the first pivot bearing (2b).

11. Adjustment fitting according to at least one of claims 1 to 10, characterized in that the common thickness of the disks arranged adjacent to one another (4e; 4f; 4e '; 4f') corresponds to the thickness of the sliding pieces (4c; 4d; 4c '; 4d') corresponds at least approximately.

12. Adjustment fitting according to at least one of claims 1 to 11, characterized in that the disks (4e, 4f; 4e '; 4f) can be rotated in the drive direction by means of driving pins (4m) fixed on the driven bearing part (4a).

13. Adjustment fitting according to claim 12, characterized in that the driver pins (4m) and their counter surfaces on the disks (4e; 4f; 4e ';4f') are designed to bear with rotational play.

14. Adjustment fitting according to at least one of claims 1 to 13, characterized in that the spring (5) is a spreading spring designed as an annular spring, the ends of which are each on a counter surface (4o) of the different disks (4e; 4f; 4e '; 4f' ) issue.

15. Adjustment fitting according to at least one of claims 1 to 14, characterized in that the recesses (4h; 4i; 4h '; 4i') for the sliders (4c; 4d; 4c '; 4d') on both disks (4e; 4f ; 4e '; 4f') are formed and arranged mirrored on a plane of symmetry running through the axis of rotation (3).

16. Adjusting fitting according to at least one of claims 1 to 15, characterized in that of the recesses (4h; 4i; 4h '; 4i') provided twice per disc (4e; 4f; 4e '; 4f') for receiving the sliders (4c; 4d; 4c '; 4d') each extend over a length corresponding to the length of a slide (4c; 4cl; 4c '; 4d') and the other over a length which is greater than that of a slide (4c; 4d; 4c '; 4d').

17. Adjustment fitting according to at least one of claims 1 to 16, characterized in that the bottoms (41; 41 ') of the recesses (4i; 4i') of both disks (4e; 4f; 4e '; 4f), each having a greater length than the sliding pieces (4c; 4d; 4c'; 4d ') ') rest in full on the inner contours of the sliders (4c; 4d; 4c'; 4d ') when the eccentric (4; 4') is not driven.

18. Adjustment fitting according to at least one of claims 1 to 17, characterized in that the bottoms (4k; 4k ') of the recess (4h; 4h') each having the same length as the sliders (4c; 4d; 4c '; 4d') ) of the two disks (4e; 4f; 4e '; 4f) in the non-driven state of the eccentric (4; 4') are at a distance from the adjacent slide piece (4c; 4d; 4c '; 4d').

19. Adjustment fitting according to at least one of claims 1 to 18, characterized in that the bottoms (4k; 41; 4k '; 41') with a constant

Radius are curved.