WO2016033991A1

WO2016033991A1 - Brake drum

Info

Publication number: WO2016033991A1
Application number: PCT/CN2015/078550
Authority: WO
Inventors: 吕继贤; 蒲光明
Original assignee: 山东浩信机械有限公司
Priority date: 2014-09-01
Filing date: 2015-05-08
Publication date: 2016-03-10

Abstract

A brake drum comprises a brake drum body (1). The brake drum body (1) comprises a mounting portion (101) for connecting with a wheel and a brake portion (103) for co-operating with a brake shoe. A transitional connecting portion (102) is provided between the mounting portion (101) and the brake portion (103). The outer peripheral face of the brake portion (103) is tightly sleeved with a hoop device. The hoop device uses a plurality of separate hoop bands (2; 2a) or a one-piece hollow hoop (2b). The outer peripheral face of the brake portion (103) is tightly sleeved with the hoop device, thereby effectively restraining the radial expansion deformation, improving the fatigue resistance of the brake drum body (1). Furthermore, holding power is exerted on the brake drum body (1) by the hoop device, thereby avoiding the danger of the brake drum body (1) breaking and flying off and greatly increasing the service life and the use safety. In addition, the wall thickness of the part of the brake portion (103) corresponding to the hoop device can be effectively decreased, thereby effectively reducing the temperature difference between the inside and the outside of the brake drum body (1), improving the thermal conductivity and laying the foundation for heat dissipation and for prevention of the occurrence of cracks in the inner wall of the brake drum body (1).

Description

Brake drum

Solemnly declare:

The present invention claims the priority of the following three patent applications:

The application date is September 01, 2014, the application number is 201410439863.9, and the Chinese invention patent application named “ring groove steel hoop brake drum”;

The application date is March 26, 2015, and the application number is 201520175568.7, and the Chinese utility model patent application named “a brake drum”;

The application date is April 29, 2015, and the application number is 201520270335.5, and the Chinese utility model patent application named “Brake Drum”.

Technical field

The invention belongs to the technical field of vehicle drum brakes, and in particular to a brake drum.

Background technique

Drum brake (brake) is one of the important components of the vehicle. At present, in the truck, the most widely used is the integrally cast drum brake, which includes the brake drum and brake shoes, brake shoes. It can be in contact with the inner side of the brake drum. The brake drum is in a rotating state during the running of the vehicle. When braking, the brake shoe is pressed against the brake drum by the braking force, and the frictional resistance between the brake drum and the brake drum is used to decelerate or drive the vehicle. Parking to ensure safe driving.

When the car is heavy-duty, high-speed, especially on the long slope or steep slope, the temperature of the inner wall of the brake drum rises sharply due to the need of a large braking force and multiple consecutive braking to ensure that the car is in a controllable state. The temperature difference between the inside and the outside of the brake drum is increased, resulting in a sharp drop in the high temperature mechanical properties of the brake drum material and a decrease in fatigue strength. The traditional brake drum is made of gray cast iron, which has the typical characteristics of low strength and high brittleness. In order to reduce the negative effects of these characteristics, the wall of the brake drum must be made thick to ensure a high structural strength of the brake drum. In this way, when braking, the temperature difference between the inside and the outside of the brake drum body is larger, and the temperature difference stress is large, the high temperature mechanical properties of the material are further deteriorated, and the expansion stress generated by the brake is not eliminated in time, resulting in braking. The drum body develops from longitudinal microcracking to cracking and eventually to cracking. Therefore, the overall cast brake drum has a short service life.

In addition, after the brake drum is braked, if it is in contact with water, the drum body will be thermally cracked or burst due to chilling. In severe cases, the brake drum will rupture and fly out to cause a safety accident, so the safety of use is higher. difference.

Summary of the invention

The technical problem to be solved by the present invention is to provide a brake drum which can improve the safety and service life of use at a more economical cost.

In order to solve the above technical problem, the technical solution of the present invention is: a brake drum comprising: a brake drum body, the brake drum body including a mounting portion for connecting with a wheel and for mating with the brake shoe The braking portion is provided with a transition connecting portion between the mounting portion and the braking portion; the outer peripheral surface of the braking portion is tightly fitted with a hoop device.

As an improvement, the hoop device is constructed to include two or more ferrules.

Wherein, the cross-sectional shape of the ferrule is rectangular or U-shaped, the cross-sectional area of the ferrule at the intermediate position is larger than the cross-sectional area of the ferrule at the two sides, and the outer peripheral surface of the braking portion is opened A plurality of ferrule mounting slots, each of the ferrules being constrained to be mounted in a ferrule mounting groove.

Wherein the cross-sectional shape of the ferrule is a unequal U-shaped structure, the outer peripheral surface of the braking portion is provided with a ferrule mounting groove, and all the ferrules are sequentially abutted together and constrained to be mounted on the The ferrule is installed in the groove.

Wherein, the height of the ferrule decreases from the intermediate position to both sides.

As another improvement, the hoop device is configured to include a plurality of first ferrules arranged in an axial direction, away from one end of the transitional connection portion and between the two adjacent first ferrules. a second ferrule, all of the first ferrule and the second ferrule abutting each other; a width of the first ferrule is greater than a width of the second ferrule, the first ferrule The outer diameter is smaller than the outer diameter of the second ferrule.

Wherein, the cross-sectional shape of the first ferrule is "U" shape or "L" shape or square shape; the end of the second ferrule away from the braking portion is square or semi-circular or "U" shape.

As a further improvement, the hoop device has a structure comprising: two or more ferrules; the ferrule has a rectangular or substantially rectangular cross section, and two sides of the ferrule are spaced apart from each other. One or two or more heat dissipating grooves, or two or more of each of the two sides are spaced apart Heat sink groove.

Wherein, in the cross section of the ferrule, the width of the bottom portion is greater than the width of the top portion thereof.

As a further improvement, the hoop device is constructed to include a hollow cuff, the solid portions of the cuff being joined together, the transparent portion of the cuff being open to the atmosphere.

Wherein, the transparent portion of the cuff includes one or more heat dissipation hole groups, and each of the heat dissipation hole groups includes two or more arcuate long holes arranged in a circumferential direction.

As another improvement, two or more annular ribs are disposed on a portion of the braking portion on a portion of the outer peripheral surface of the transition portion, and an annular recess is formed between two adjacent annular ribs. groove.

After adopting the above technical solutions, the beneficial effects of the present invention are:

The hoop device is tightly fitted on the outer peripheral surface of the braking portion, which not only effectively restrains the radial expansion deformation, but also improves the fatigue resistance of the brake drum body; moreover, the hoop device has a holding force on the brake drum body to avoid The danger of the brake drum body rupturing and flying out greatly improves the service life and the safety of use; in addition, the wall thickness of the braking portion corresponding to the hoop device can be effectively reduced, which can effectively reduce not only the inside and outside of the brake drum body The temperature difference, but also improved the thermal conductivity, while laying the foundation for heat dissipation and prevention of cracks in the inner wall of the brake drum.

Since the annular rib is provided on a part of the outer circumferential surface of the braking portion, not only the strength of the brake drum body but also the heat dissipation area is increased, and the processability is good and the cost is low. In combination with the hoop device, the purpose of improving the safety of use and prolonging the service life is further achieved at a more economical cost.

When the hoop device adopts the split type ferrule, since the hoop ring has a single row structure, it is more convenient to manufacture and manufacture, and the assembly flexibility is improved.

When the hoop device adopts the hollow cuff, the hoop is an integrated structure, which is convenient for assembly and improves the assembly efficiency of the cuff and the brake drum body.

DRAWINGS

Figure 1 is a longitudinal cross-sectional view showing a first embodiment of the present invention;

Figure 2 is a longitudinal cross-sectional view showing a second embodiment of the present invention;

Figure 3 is a longitudinal cross-sectional view showing a third embodiment of the present invention;

Figure 4 is a longitudinal cross-sectional view showing a fourth embodiment of the present invention;

Figure 5 is a longitudinal cross-sectional view showing a fifth embodiment of the present invention;

Figure 6 is a cross-sectional view taken along line B-B of Figure 5;

Figure 7 is a partial enlarged view of a portion A in Figure 5;

Figure 8 is a partial enlarged view of the sixth embodiment of the present invention corresponding to A in Figure 5;

Figure 9 is a partial enlarged view of the seventh embodiment of the present invention corresponding to A in Figure 5;

Figure 10 is a longitudinal cross-sectional view showing an eighth embodiment of the present invention;

Figure 11 is a perspective view showing the three-dimensional structure of the cuff of Figure 10;

In the figure, 1-brake drum body; 101-mounting portion; 102-transition connecting portion; 103-brake portion; 104-ring rib; 105-annular groove; 2-ring ring; 23-first ferrule ; 24 - second ferrule; 2a - ferrule; 2b - ferrule; 201 - heat dissipation groove; 202 - annular rib; 203 - curved long hole;

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Embodiment 1

As shown in Fig. 1, a brake drum includes a brake drum body 1. The brake drum body 1 is preferably made of cast iron material, and the brake drum body 1 includes a mounting portion 101 for connection with the wheel and a system for making The brake portion 103 cooperated with the movable shoe, the transition portion 102 is disposed between the mounting portion 101 and the braking portion 103, and the hoop device is tightly fitted on the outer peripheral surface of the braking portion 103, wherein the hoop device includes several (two One or more than two axially aligned ferrules 2, the ferrule 2 is preferably made of a steel material. Through the tightening force of the ferrule 2, the structural strength of the brake drum body 1 can be improved under the premise of reducing the thickness of the brake drum body 1, the heat dissipation performance is improved, the mechanical performance and safety are improved, and the brake is extended. The life of the drum.

In Fig. 1, the cross-sectional shape of the ferrule 2 is a rectangle, wherein preferably, the cross-sectional area of the ferrule 2 at the intermediate position is larger than the cross-sectional area of the ferrule 2 at the two sides, and when braking, the braking portion 103 The force received will decrease from the intermediate position to the both sides, and the cross-sectional area of the ferrule 2 is reduced from the intermediate position to the two sides to ensure the safety of the brake drum body 1; the outer peripheral surface of the braking portion 103 is provided with a plurality of ferrules. The groove, each ferrule 2 is constrained to be installed in a ferrule mounting groove.

Embodiment 2

As shown in FIG. 2, the structure of the second embodiment is basically the same as that of the first embodiment, except that the cross-sectional shape of the ferrule 2 is U-shaped, so that the hoop can be reduced while ensuring the structural strength of the brake drum body 1. The thickness of the ring 2, in turn, reduces the weight of the ferrule 2.

Embodiment 3

As shown in FIG. 3, the structure of the third embodiment is basically the same as that of the second embodiment, except that the cross-sectional shape of the ferrule 2 is a unequal U-shaped structure, and a hoop is formed on the outer circumferential surface of the braking portion 103. The ring is installed in the groove, and all the ferrules 2 are abutted together and constrained to be installed in the ferrule mounting groove. The outer peripheral surface of the braking portion 103 is covered with the ferrule 2, and when the brake drum body 1 is subjected to heat chilling, the phenomenon that the water directly contacts the brake drum body 1 to cause thermal cracking and bursting can be avoided; in addition, a plurality of ferrules 2 are topped. The tightening force after being close together is stronger, the danger of the brake drum body 1 breaking and flying out is avoided, the safety is improved, and the service life of the brake drum is prolonged.

Preferably, the height of the ferrule 2 decreases from the intermediate position to the both sides. When braking, the force received by the braking portion 103 decreases from the intermediate position to the both sides, and the height of the ferrule 2 decreases from the intermediate position to the both sides. The safety of the brake drum body 1 can be ensured.

Embodiment 4

As shown in FIG. 4, the structure is basically the same as that of the third embodiment, except that the hoop device of the fourth embodiment includes a plurality of first ferrules 23 arranged axially, away from one end of the transition connecting portion 102 and located at the phase. A second ferrule 24 is disposed between the adjacent first ferrules 23, and all of the first ferrule 23 and the second ferrule 24 are abutted against each other; wherein the width of the first ferrule 23 is greater than the second ferrule The width of 24, the outer diameter of the first ferrule 23 is smaller than the outer diameter of the second ferrule 24, this design is such that the first ferrule 23 is mainly used for heat dissipation, and the second ferrule 24 is mainly used for carrying, the first ferrule The cooperation of the ring 23 with the second ferrule 24 increases the heat dissipation capability, structural strength, mechanical properties and load carrying capacity of the brake drum. .

4 shows that the cross-sectional shape of the first ferrule 23 is "L" shape, and of course, it may be a "U" shape or a square shape; the end of the second ferrule 24 away from the braking portion 103 is square, of course, It can be semi-circular or "U" shaped.

Embodiment 5

As shown in FIG. 5 to FIG. 7 , the structure of the fifth embodiment is basically the same as that of the first embodiment, and includes the system. The movable drum body 1 and the set of ferrules 2a are different in that a plurality of (two or more) annular ribs 104 are provided on the outer peripheral surface of the braking portion 103 near the transition connecting portion 102, An annular groove 105 is formed between adjacent annular ribs 104. The arrangement of the annular ribs not only improves the strength of the brake drum body but also increases the heat dissipation area, and has good workability and low cost.

The ferrule 2a is tightly fitted over the braking portion 103 on a portion of the outer peripheral surface of the annular rib 104. There are a plurality of ferrules 2a (two or more). In general, the ferrule 2a and the brake drum body 1 need to be thermally assembled to ensure that the ferrule 2a does not disengage from the brake drum body under any working condition. 1. Further, an annular groove 3 is provided in the braking portion 103, and the ferrule 2a is nested in the annular groove 3 to mount the ferrule 2a at a predetermined position.

As shown in FIG. 6 and FIG. 7, the ferrule 2a has a substantially rectangular cross section, and each of the two sides of the ferrule 2a is provided with a plurality of (two or more) heat dissipating grooves 201 on each side. . The utility model has the advantages that not only the heat dissipation area can be increased, but also convection with the air is facilitated during the rotation process, which is beneficial to improving the heat dissipation efficiency. For the above purpose, it is also possible to provide the heat dissipation grooves 201 at intervals on only one side of the ferrule 2a.

Embodiment 6

As shown in FIG. 8, the structure is basically the same as that of the fifth embodiment, except that in the cross section of the ferrule 2a, the width of the bottom portion is larger than the width of the top portion thereof to further increase the ferrule 2a and the brake drum. The contact area of the body 1 increases the strength and improves the heat dissipation efficiency.

Example 7

As shown in FIG. 9, the structure is basically the same as that of the fifth embodiment, except that the cross section of the ferrule 2a is a standard rectangle, and the side surface has no heat dissipation groove 201, and the purpose of simplifying the structure is to reduce the cost.

In the brake drums of the first embodiment to the seventh embodiment, the hoop device adopts a plurality of ferrules. Since the ferrules have a single-row structure, the manufacturing process is more convenient and the assembly flexibility is improved; The shape and number of the ferrules are only illustrative and not limiting. Those skilled in the art can increase or decrease the number of ferrules according to actual needs, and the cross-sectional shape of the ferrules can also be realized by those skilled in the art. Other shapes.

Example eight

As shown in FIG. 10 and FIG. 11, the structure is basically the same as that of the fifth embodiment, except that the brake portion 103 of the brake drum body 1 is tightly fitted with a hollow cuff 2b, and the cuff 2b. The solid portions are joined together and the transparent portion of the cuff 2b is open to the atmosphere. The cuff 2b is preferably made of cast iron. Both the cuff 2b and the ferrule 2a belong to one of the hoop devices.

The permeable portion of the ferrule 2b includes a plurality of (one or more) louvers, each of which includes a plurality (two or more) of arcuate elongated holes 203 spaced in the circumferential direction. In order to improve the structural strength and mechanical properties of the cuff 2b, a plurality of (one or more) annular beads 202 are provided on the outer peripheral surface of the solid portion of the cuff 2b, and the annular bead 202 is disposed adjacent to the heat dissipation hole group. The hollow structure is not limited to this, and all structures that can ensure both strength and heat dissipation are feasible. The greatest advantage of the hollow structure is that the cuff 2b can be made integral, which facilitates the assembly efficiency of the cuff 2b and the brake drum body 1.

The brake drums of the fifth embodiment to the eighth embodiment are all provided with a plurality of (two or more) annular ribs on the outer peripheral surface of the braking portion adjacent to the transition connecting portion, and adjacent annular convex ribs. An annular groove is formed between the ribs. It should be noted that the arrangement of the annular ribs and the annular grooves is not limited to the fifth embodiment to the eighth embodiment. The brakes of the brake drums of the first embodiment to the fourth embodiment can also be performed by those skilled in the art according to actual needs. An annular rib and an annular groove are provided on a portion of the outer peripheral surface of the portion adjacent to the transitional connection portion.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Industrial applicability

The brake drum of the present invention is tightly fitted with a hoop device on the outer peripheral surface of the braking portion, which not only can effectively restrain the radial expansion deformation, but also improve the fatigue resistance of the brake drum body; moreover, the hoop device will be applied to the brake drum body. The clamping force avoids the danger of the brake drum body rupturing and flying out, greatly improving the service life and the safety of use; in addition, the wall thickness of the braking portion corresponding to the hoop device can be effectively reduced, which can not only effectively reduce The temperature difference between the inside and outside of the brake drum is improved, and the thermal conductivity is improved, and the foundation for heat dissipation and cracking of the inner wall of the brake drum is laid.

An annular convex rib is provided on a part of the outer circumferential surface of the braking portion, which not only improves the strength of the brake drum body but also increases the heat dissipation area, and has good workability and low cost. In combination with the hoop device, the purpose of improving the safety of use and prolonging the service life is further achieved at a more economical cost.

Claims

A brake drum comprising: a brake drum body, the brake drum body including a mounting portion for connecting with a wheel and a braking portion for mating with the brake shoe, the mounting portion and the system A transition joint is disposed between the movable portions; and the outer peripheral surface of the brake portion is tightly fitted with a hoop device.
A brake drum according to claim 1 wherein said hoop means comprises two or more ferrules.
A brake drum according to claim 2, wherein said ferrule has a rectangular or U-shaped cross-sectional shape, and said ferrule at an intermediate position has a larger cross-sectional area than said ferrule at both sides The outer peripheral surface of the braking portion is provided with a plurality of ferrule mounting grooves, and each of the ferrules is constrained to be mounted in a ferrule mounting groove.
The brake drum according to claim 2, wherein the ferrule has a cross-sectional shape of a unequal U-shaped structure, and an outer circumferential surface of the braking portion is provided with a ferrule mounting groove, all of the The ferrules are in turn abutted together and constrained to fit within the ferrule mounting groove.
A brake drum according to claim 4, wherein the height of said ferrule is decreased from the intermediate position to both sides.
A brake drum according to claim 1, wherein said hoop device comprises a plurality of first ferrules arranged axially, away from one end of said transitional connection and located adjacent said first ferrule a second ferrule is disposed therebetween, and all of the first ferrule and the second ferrule are abutted against each other;

The width of the first ferrule is greater than the width of the second ferrule, and the outer diameter of the first ferrule is smaller than the outer diameter of the second ferrule.
A brake drum according to claim 6, wherein said first ferrule has a cross-sectional shape of "U" or "L" or square; said second ferrule being remote from said braking portion One end is square or semi-circular or "U" shaped.
The brake drum according to claim 2, wherein the ferrule has a rectangular or substantially rectangular cross section, and one side of the ferrule is provided with two or more heat dissipating grooves at intervals. Or two or more heat dissipation grooves are provided on each of the two sides.
A brake drum according to claim 8, wherein a width of a bottom portion of said ferrule is larger than a width of a top portion thereof.
A brake drum according to claim 1 wherein said hoop means comprises a hollow cuff, the solid portions of said cuff being joined together, the transparent portion of said cuff being open to the atmosphere.
A brake drum according to claim 10, wherein said transparent portion of said ferrule comprises one or more venting holes, each of said venting holes comprising two or more circumferential directions Curved long holes arranged at intervals.
A brake drum according to any one of claims 1 to 11, wherein two or more annular ribs are provided on an outer peripheral surface of a portion of the braking portion adjacent to the transition connecting portion. An annular groove is formed between two adjacent annular ribs.