CN114382801A

CN114382801A - Vehicle brake system and vehicle

Info

Publication number: CN114382801A
Application number: CN202011117958.0A
Authority: CN
Inventors: 张斌; 苏辉; 蔡向阳
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2020-10-19
Filing date: 2020-10-19
Publication date: 2022-04-22

Abstract

The invention relates to a vehicle brake system and a vehicle. In the vehicle brake system, the friction disc of the rotating assembly rotating along with the wheel of the vehicle and the brake lining assembly of the corresponding brake assembly continuously extend along the circumferential direction, so that the thermal performance and the braking capability of the whole vehicle brake system are better; in addition, the radial outer side part of the brake assembly is opposite to the rotating assembly in the axial direction, the radial inner side part of the brake assembly is opposite to the actuating assembly, and the actuating assembly is arranged on the radial inner side of the brake assembly, so that the structure of the whole brake system is more compact.

Description

Vehicle brake system and vehicle

Technical Field

The present invention relates to the field of braking of vehicles, and in particular to a braking system for a vehicle and a vehicle comprising the same.

Background

In the related art, as shown in fig. 1, a brake system 20 for a power wheel (wheel for directly receiving torque of a power source) 40 of a vehicle according to the related art is generally assembled in the power wheel 40. The power wheel 40 is driven by the motor 10 as a power source via the planetary gear mechanism 30, and the braking torque of the brake system 20 is also transmitted to the power wheel 40 via the planetary gear mechanism 30. Because of the limited space available for the power wheels 40, the construction of the brake system 20 is designed to be as compact as possible.

Generally, a brake system according to the related art includes a drum brake system and a disc brake system. However, the heat dissipation capability of the drum brake system is not good, and heat generated by friction cannot be quickly dissipated after the brake drum is closed for continuous braking, so that the temperature of the brake lining is increased and the braking efficiency is deteriorated. The caliper of a disc brake system occupies a large space, and the area of the brake lining needs to be large to meet the requirement of braking efficiency, so that the structure is not compact enough.

Disclosure of Invention

The present invention has been made in view of the above-mentioned drawbacks of the prior art. An object of the present invention is to provide a novel vehicular brake system having a more compact structure than an existing disc brake system with a higher thermal performance relative to an existing drum brake system. In addition, another object of the present invention is to provide a vehicle including the vehicular brake system described above.

In order to achieve the above object of the present invention, the present invention may adopt the following technical means.

The present invention provides a brake system for a vehicle, the brake system including:

a rotating assembly drivingly coupled to a wheel such that the rotating assembly is rotatable with the wheel, the rotating assembly including a friction disc extending continuously along a circumferential direction of the wheel, an axial side of the friction disc forming a first friction surface;

a brake assembly that is relatively stationary in the circumferential direction, the brake assembly including a transmission member and a brake lining that extends continuously along the circumferential direction, the brake lining being located axially outward of the friction disc and having a second friction surface opposite the first friction surface, a radially outward end of the transmission member abutting the brake lining; and

the actuating assembly is located on the radial inner side of the brake lining and corresponds to the radial inner end of the transmission piece, and the transmission piece can be pressed against the brake lining under the action of the actuating force of the actuating assembly, so that the first friction surface and the second friction surface are pressed against each other to generate a braking torque.

Preferably, the rotating assembly further comprises a disc holder, the friction disc being drivingly coupled to the wheel via the disc holder, the friction disc and the disc holder being fixed relative to each other at least in the circumferential direction.

More preferably, the disk holder includes an axial portion extending in the axial direction of the wheel, and a radial portion connected to one axial end of the axial portion and extending radially inward in the radial direction of the wheel, the axial portion being formed with an internal spline, a radially outer side surface of the friction disk being formed with an external spline that is fitted with the internal spline, the friction disk and the disk holder being fixed relative to each other in the circumferential direction by the fit of the internal spline and the external spline.

More preferably, one axial end of the friction disc is retained by a portion of the axial portion in the axial direction of the wheel, at which the internal spline is not formed, and the rotating assembly further includes a first stopper ring that is caught to the axial portion, and the other axial end of the friction disc is retained by the first stopper ring in the axial direction of the wheel, so that the friction disc is fixed relative to the disc holder in the axial direction.

More preferably, the brake assembly further includes a brake bush support fixedly supporting the brake bush, and a brake support for supporting the brake bush support and the transmission member, the brake bush support being fixed relative to the brake support in the circumferential direction, the brake bush and the brake bush support being movable relative to the brake support so as to approach/separate from the friction disc.

More preferably, the brake bush is fixed to a radially outer portion of the brake bush support by bonding, and a radially inner portion of the brake bush support and the brake support are relatively fixed in the circumferential direction by a spline structure.

More preferably, a radially outer portion of the transmission member extends continuously in the circumferential direction, and a radially inner portion of the transmission member forms a rod-like portion that passes through the brake spider toward a radially inner side, a radially inner end of the rod-like portion being opposite to the actuating assembly located at the radially inner side of the brake spider.

More preferably, the vehicular brake system includes two brake bushes and two transmission members located on both sides of the friction disc in an axial direction, and further includes a second stopper ring that is snap-fitted to the brake carrier and limits positions of the two transmission members in the axial direction of the wheel with the second stopper ring and a support portion of a housing of the vehicular brake system, and the two transmission members are capable of performing lever movements with the second stopper ring and the support portion as fulcrums, respectively, under an actuating force of the actuating assembly.

More preferably, the vehicle brake system further comprises a housing fixed relative to a wheel suspension of the vehicle, the rotating assembly, the brake assembly and the actuating assembly each being disposed within the housing with a predetermined spacing from the housing.

The invention provides a vehicle comprising the vehicle brake system according to any one of the above aspects, wherein a power source of the vehicle is in transmission coupling with the wheel via a planetary carrier of a planetary gear mechanism, and a rotating component of the vehicle brake system is fixedly mounted on a sun gear of the planetary gear mechanism.

By adopting the technical scheme, the invention provides a novel vehicle brake system and a vehicle comprising the same. In the vehicle brake system, the friction disc of the rotating assembly rotating along with the wheel of the vehicle and the brake lining assembly of the corresponding brake assembly continuously extend along the circumferential direction, so that the thermal performance and the braking capability of the whole vehicle brake system are better; in addition, the radial outer side part of the brake assembly is opposite to the rotating assembly in the axial direction, the radial inner side part of the brake assembly is opposite to the actuating assembly, and the actuating assembly is arranged on the radial inner side of the brake assembly, so that the structure of the whole brake system is more compact.

Drawings

Fig. 1 is a partial structural schematic view showing a wheel including a brake system for a vehicle according to the related art.

Fig. 2 is a perspective view schematically showing a brake system for a vehicle according to an embodiment of the present invention.

Fig. 3 is an enlarged schematic view showing a partial structure of the vehicular brake system in fig. 2, in which a partial structure of a housing and the like is omitted for clarity of illustration.

Description of the reference numerals

10 motor 20 braking system 30 planetary gear mechanism 40 power wheel

1 housing 11 body 12 housing cover 12p support part 2 rotating assembly 21 friction disc 21s first friction surface 22 disc support 22a axial part 22r radial part 23 first stop ring 3 brake assembly 31 brake lining 31s second friction surface 32 brake lining support 33 transmission 34 brake support 35 second stop ring 4 brake assembly 41 actuating piston 42 connecting tube

SU sun gear B bearing

The A axis is R radial.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The vehicle brake system according to the present invention is mounted inside a wheel such that the center axis thereof coincides with the center axis of the wheel.

In the present invention, unless otherwise specified, the axial direction, the radial direction, and the circumferential direction refer to the axial direction, the radial direction, and the circumferential direction of the wheel, respectively; the "axially outboard" center line in the axial direction of the friction disks of the rotating assembly away from the braking system; "one axial side" means the left side in fig. 2, and "the other axial side" means the right side in fig. 2. Further, "drive coupled" means that two components are directly connected or indirectly connected through a gear train in a manner that enables bidirectional torque transfer.

The structure and operation of the vehicular brake system according to an embodiment of the present invention will be described below.

As shown in fig. 2 and 3, a brake system for a vehicle according to an embodiment of the present invention includes a housing 1, and a rotating assembly 2, a brake assembly 3, and an actuating assembly 4 disposed in the housing 1.

In the present embodiment, the housing 1 is fixed with respect to the wheel suspension of the vehicle so that the housing 1 moves with the body of the vehicle but does not rotate with the wheels. The housing 1 has a cylindrical shape as a whole, and includes a housing main body 11 and a housing cover 12 assembled with each other, and the housing cover 12 closes an opening of the housing main body 11 from the other axial side, thereby forming an installation space inside the housing 1. The rotating assembly 2, the braking assembly 3 and the actuating assembly 4 are all arranged in the installation space of the shell 1 in a manner of having a preset interval with the shell 1, and the preset interval can be set according to the heat dissipation requirement of the braking system so as to achieve a better heat dissipation effect. Herein, the "preset interval" means that the rotating assembly 2, the braking assembly 3, and the actuating assembly 4 are spaced apart from at least a portion of the housing 1, and does not exclude the rotating assembly 2, the braking assembly 3, and the actuating assembly 4 from being in contact with a portion of the housing 1. In addition, the housing 1 is formed with a support portion 12p protruding toward the inside of the housing 1 for supporting the brake assembly 3.

Further, in the present embodiment, the rotating assembly 2 is drivingly coupled to the wheel such that the rotating assembly 2 can rotate with the wheel. The rotating assembly 2 includes a friction disc 21, a disc holder 22 and a first stop ring 23 assembled together.

Specifically, the friction disc 21 has a plate-like annular shape and extends continuously in the circumferential direction, and both side surfaces in the axial direction of the friction disc 21 form first friction surfaces 21s that are opposed to the second friction surfaces 31s of the brake lining 31 of the brake assembly 3 in the axial direction a. As soon as the first friction surface 21s is pressed against the second friction surface 31s during rotation of the wheel, a braking torque is generated between the two

friction surfaces

21s, 31 s.

The disk carrier 22 and the friction disk 21 are fixed relative to one another in the circumferential direction and the axial direction a, so that the friction disk 21 is coupled in a driving manner to the wheel via the disk carrier 22. The disk holder 22 includes an axial portion 22a extending in the axial direction a and a radial portion 22R connected to an axial one-side end of the axial portion 22a and extending toward the radially inner side in the radial direction R of the wheel. On the one hand, the axial portion 22a is formed with internal splines projecting toward the radially inner side, and the radially outer side surface of the friction disc 21 is formed with external splines that are fitted with the internal splines, so that the friction disc 21 and the disc holder 22 are fixed (torque-proof coupling) relative to each other in the circumferential direction by the fit of the internal splines and the external splines. On the other hand, in the axial direction a, one axial-direction side end of the friction disc 21 is limited by a portion of the axial portion 22a where the internal splines are not formed, the first stopper ring 23 is snap-fitted and fixed to the axial portion 22a and the other axial-direction side end of the friction disc 21 is limited by the first stopper ring 23, so that the friction disc 21 is fixed relative to the disc holder 22 in the axial direction a. In addition, the radial portion 22r extends toward the radially inner side to the sun gear SU of the planetary gear mechanism in the wheel, and the radially inner side portion of the radial portion 22r is fixed together with the sun gear SU.

Further, in the present embodiment, the brake assembly 3 is relatively stationary in the circumferential direction so as not to rotate with the wheel. The brake assembly 3 includes a brake bush 31, a brake bush support 32, a transmission member 33, a brake support 34, and a second snap ring 35 assembled together.

Specifically, the two brake bushes 31 are located both axially outside the friction disc 21 and on both axial sides of the friction disc 21, respectively. Each brake lining 31 extends continuously in the circumferential direction and has a second friction surface 31s opposing the first friction surface 21s, and the area of the second friction surface 31s may be designed to be the same as the area of the first friction surface 21s, so that a brake torque as large as possible can be generated while ensuring thermal performance therebetween. Here, the brake lining 31 "continuously extends" does not exclude the brake lining 31 being provided with necessary heat dissipation holes and/or mounting holes.

The two brake bush brackets 32 correspond to the two brake bushes 31, respectively. Each brake bush support 32 fixedly supports the corresponding brake bush 31. The brake lining 31 is fixed to a radially outer portion of the corresponding brake lining holder 32 by bonding, and a radially inner portion of the brake lining holder 32 is coupled with the brake holder 34 in a torque-proof manner by a spline structure, so that the brake lining holder 32 and the brake holder 34 are relatively fixed in the circumferential direction.

The two transmission members 33 correspond to the two brake lining holders 32, respectively. A radially outer portion of each transmission piece 33 extends continuously in the circumferential direction, and a radially outer end of each transmission piece 33 abuts the corresponding brake bush holder 32, thereby indirectly abutting the corresponding brake bush 31. The radially inner portion of each transmission member 33 is formed as a plurality of rod-like portions that pass through the brake bracket 34, and the radially inner end of each rod-like portion is opposed to the actuating assembly 4 located radially inward of the brake bracket 34. In this way, in the event of an actuation force of the actuation assembly 4 acting on the radially inner end of the transmission member 33, the radially outer end of the transmission member 33 can be pressed against the brake lining carrier 32 so as to be pressed against the brake lining 31.

The brake support 34 having a cylindrical shape is used to support the brake bush support 32 and the transmission member 33. The brake bracket 34 forms an external spline and the brake lining bracket 32 forms an internal spline matching the external spline, so that the brake bracket 34 and the brake lining bracket 32 are coupled in a rotationally fixed manner by a spline structure to be relatively fixed in the circumferential direction. However, the brake bush 31 and the brake bush holder 32 are capable of relative movement in the axial direction a with respect to the brake holder 34 so as to approach/separate from the friction disc 21.

In addition, the second stop ring 35 is snap-fitted to the brake bracket 34, and the second stop ring 35 and the support portion 12p of the housing 1 limit the position of the two transmission members 33 in the axial direction a. Under the action of the actuating force of the actuating assembly 4, the two transmission members 33 can perform a lever movement with the second stop ring 35 and the support portion 12p as a fulcrum, respectively, which in turn transmits the actuating force to the brake bush bracket 32 and the brake bush 31, so that the second friction surface 31s can be pressed against the first friction surface 21 s.

Further, in the present embodiment, the actuating assembly 4 is located radially inward of the brake lining holder 32 and corresponds to a radially inward end of the transmission 33. The actuating assembly 4 comprises two actuating pistons 41 and a connecting tube 42 for receiving and mounting the brake pistons. In the event that a braking torque needs to be generated, the two actuating pistons 41 generate actuating forces toward the axial sides, respectively.

The operation of the vehicle brake system will be described below. With the above-described structure, in the case where the brake system for a vehicle according to an embodiment of the present invention is required to generate a braking torque, the actuating pistons 41 of the actuating assembly 4 apply actuating forces to the radially inner ends of the two transmission members 33 toward both axial sides, respectively. Using the principle of leverage, the two transmission members 33 perform lever movements with the second stopper ring 35 and the support portion 12p of the housing 1 as fulcrums, respectively, so that the radially outer ends of the transmission members 33 apply forces directed toward the axially inner sides, respectively, to the two brake bush holders 32. Under the action of the above-described force, the second friction surface 31s of the brake bush 31 and the first friction surface 21s of the friction disk 21 are pressed together, thereby generating a braking torque between the two

friction surfaces

21s, 31 s. In the event that the braking torque of the vehicle brake system according to an embodiment of the present invention is not required to be generated, the actuating piston 41 of the actuating assembly 4 cancels the actuating force, and the two transmission members 33 may be reset by their own elasticity or an additional reset assembly, so that the second friction surface 31s of the brake lining 31 is out of contact with the first friction surface 21s of the friction disk 21, thereby canceling the braking torque.

In addition, the invention also provides a vehicle which comprises the vehicle brake system with the structure. In one example of the vehicle in which torque of a power source (e.g., a motor) of the vehicle is transmitted to wheels via a carrier of a planetary gear mechanism, the rotating assembly 2 of the vehicular brake system according to an embodiment of the invention is fixedly mounted to a sun gear SU of the planetary gear mechanism.

The above-mentioned details are provided to explain the specific technical solutions of the present invention, and supplementary descriptions are provided below.

(i) Although it is explained in the above that the number of the brake bush 31, the brake bush bracket 32, the transmission member 33 and the actuator piston 41 of the brake system according to an embodiment of the present invention is two, the present invention is not limited thereto. It is also possible to have one brake lining 31, one brake lining holder 32, one transmission 33 and one actuating piston 41, and to achieve the same braking action.

(ii) Although not explicitly described in the above specific embodiments, it should be understood. For the operation of the brake system, a bearing B may be provided between the sun gear SU and the housing 1 of the brake system for a vehicle according to the present invention, as shown in fig. 2.

(iii) Although it is described in the above specific embodiment that the support portion 12p belongs to a part of the housing 1, the present invention is not limited thereto. The support portion 12p may also be part of the brake bracket 34.

(iv) The braking system according to the invention is capable of providing good thermal performance with a compact structure. In particular, since the brake lining 31 extends continuously in the circumferential direction and the area thereof can be designed to be sufficiently large (the same as the area of the axial side face of the friction disk 21), good thermal performance and braking capability can be achieved. The actuator piston 41 is installed on the radial inner side of the brake bracket 34, which can save space, and the force application area of the actuator piston 41 can be changed or more actuator pistons 41 can be added according to the requirement. In addition, the drag torque of the friction disc 21 and the disc holder 22 to the power source of the vehicle is very small, and the friction surfaces 21s, 31s of the friction disc 21 and the brake lining 31 may be designed to be distant from the housing 1, so that the thermal influence to other parts of the wheel (especially, the power source) is very small.

Claims

1. A braking system for a vehicle, the braking system comprising:

a rotating assembly (2), the rotating assembly (2) being drivingly coupled to a wheel such that the rotating assembly (2) is rotatable with the wheel, the rotating assembly (2) comprising a friction disc (21), the friction disc (21) extending continuously in a circumferential direction of the wheel, an axial side surface of the friction disc (21) forming a first friction surface (21 s);

a brake assembly (3), the brake assembly (3) being relatively stationary in the circumferential direction, the brake assembly (3) including a transmission member (33) and a brake bush (31) extending continuously along the circumferential direction, the brake bush (31) being located axially outward of the friction disc (21) and having a second friction surface (31s) opposing the first friction surface (21s), a radially outer end of the transmission member (33) abutting the brake bush (31); and

an actuating assembly (4), the actuating assembly (4) being located radially inside the brake lining (31) and corresponding to a radially inside end of the transmission member (33), the transmission member (33) being capable of being pressed against the brake lining (31) under the action of an actuating force of the actuating assembly (4), such that the first friction surface (21s) and the second friction surface (31s) are pressed against each other to generate a braking torque.

2. A vehicle brake system according to claim 1, wherein the rotating assembly (2) further comprises a disc holder (22), the friction disc (21) being drivingly coupled to the wheel via the disc holder (22), the friction disc (21) and the disc holder (22) being fixed relative to each other at least in the circumferential direction.

3. A vehicular brake system according to claim 2, wherein the disc holder (22) includes an axial portion (22a) extending in the axial direction (a) of the wheel and a radial portion (22r) connected to one axial end of the axial portion (22a) and extending radially inward of the wheel, the axial portion (22a) being formed with an internal spline, a radially outer side surface of the friction disc (21) being formed with an external spline that engages with the internal spline, the friction disc (21) and the disc holder (22) being fixed relative to each other in the circumferential direction by the engagement of the internal spline and the external spline.

4. A vehicular brake system according to claim 3, wherein one axial end of the friction disc (21) is defined by a portion of the axial portion (22a) where the internal spline is not formed, in an axial direction (a) of the wheel, and the rotating assembly (2) further comprises a first stopper ring (23), the first stopper ring (23) being snap-fitted to the axial portion (22a), and the other axial end of the friction disc (21) is defined by the first stopper ring (23), in the axial direction (a) of the wheel, so that the friction disc (21) is fixed relative to the disc holder (22) in the axial direction (a).

5. A vehicular brake system according to any one of claims 1 to 4, characterized in that the brake assembly (3) further comprises a brake bush support (32) fixedly supporting the brake bush (31) and a brake support (34) for supporting the brake bush support (32) and the transmission member (33), the brake bush support (32) being relatively fixed with the brake support (34) in the circumferential direction, the brake bush (31) and the brake bush support (32) being movable relative to the brake support (34) so as to approach/move away from the friction disc (21).

6. The vehicular brake system according to claim 5, characterized in that the brake bush (31) is fixed to a radially outer portion of the brake bush holder (32) by bonding, and a radially inner portion of the brake bush holder (32) and the brake holder (34) are relatively fixed in the circumferential direction by a spline structure.

7. A braking system for vehicles according to claim 5, characterized in that a radially outer portion of the transmission member (33) extends continuously along the circumferential direction, and a radially inner portion of the transmission member (33) forms a rod-like portion passing through the brake bracket (34) toward a radially inner side, a radially inner end of the rod-like portion being opposite to the actuating assembly (4) located radially inside the brake bracket (34).

8. A braking system for vehicles, according to claim 5, characterized in that it comprises two of said braking bushes (31) and two of said transmission members (33) axially on either side of said friction disc (21) and further comprises a second stop ring (35), said second stop ring (35) being snap-fitted to said braking bracket (34) and said second stop ring (35) and a supporting portion (12p) of a housing (1) of the braking system for vehicles limiting the position of said two transmission members (33) in the axial direction (A) of the wheel, and said two transmission members (33) being capable of lever movement under the action of the actuating force of said actuating assembly (4) with said second stop ring (35) and said supporting portion (12p) as fulcrums, respectively.

9. A vehicle brake system according to any one of claims 1 to 4, further comprising a housing (1) fixed relative to a wheel suspension of the vehicle, the rotating assembly (2), the brake assembly (3) and the actuating assembly (4) each being arranged within the housing (1) with a preset spacing from the housing (1).

10. A vehicle comprising a vehicular brake system according to any one of claims 1 to 9, the power source of the vehicle being drivingly coupled to the wheel via the planet carrier of a planetary gear mechanism, the rotating assembly (2) of the vehicular brake system being fixedly mounted to the sun gear (SU) of the planetary gear mechanism.