Testing device for verifying effectiveness of double self-adjusting mechanisms of EPB drum brake

Abstract

The utility model provides a test device for verifying effectiveness of double self-adjusting mechanisms of an EPB drum brake. The test device comprises a test platform, and a brake drum sample piece, a brake shoe sample piece, a parking self-adjusting mechanism sample piece and a traveling self-adjusting mechanism sample piece which are arranged on the test platform, the brake shoe sample piece comprises a front shoe sample piece and a rear shoe sample piece, each of the front shoe sample piece and the rear shoe sample piece comprises a steel backing sample piece and a brake shoe lining sample piece, and a friction part for improving the roughness of a friction surface is arranged on the friction surface of the brake drum sample piece and / or the brake shoe lining sample piece; the parking self-adjusting mechanism sample piece comprises a self-adjusting rod sample piece, a pawl sample piece and a pawl pin sample piece, one end of the self-adjusting rod sample piece is connected with the pawl sample piece, the other end of the self-adjusting rod sample piece is connected with the hand brake lever sample piece, the pawl sample piece is rotationally connected with the pawl pin sample piece, a shoe hole is formed in the front shoe sample piece, and the pawl sample piece is arranged in the shoe hole. The device can quickly verify the effectiveness of the EPB drum brake double-self-adjusting mechanism, saves manpower and material resources, and is convenient to operate and high in reliability.

Description

Technical Field

[0001] This utility model belongs to the field of testing equipment technology, and specifically relates to a testing device for verifying the effectiveness of the dual self-adjusting mechanism of an EPB drum brake. Background Technology

[0002] With the rapid development of intelligent technology in the automotive industry, traditional mechanical braking systems are gradually being replaced by electronic systems. Electronic Parking Brake (EPB) systems automatically apply brakes when the vehicle is parked, reducing human error and improving safety. Furthermore, the compact design of EPB helps save space and increases the flexibility of vehicle design. Currently, the main applications of EPB in drum brakes are leading-trailing shoe EPB drum brakes and bidirectional self-energizing EPB drum brakes.

[0003] Traditional bidirectional self-increasing force EPB brake assemblies all have a self-adjusting mechanism, but due to their structure, they only have a wear compensation function. Therefore, the parking travel of the handbrake lever sample will continuously increase with the wear of the brake shoes and drum. However, the cable travel of the EPB actuator is limited (most EPB actuators on the market currently only have a 30mm travel). To ensure effective parking, a parking self-adjustment compensation mechanism must be added to the traditional bidirectional self-increasing force brake assembly's self-adjusting mechanism. When the brake shoes / drum wears to a certain extent, causing insufficient parking function, the parking self-adjustment compensation mechanism promptly adjusts the clearance between the brake shoes and drum, shortening the parking travel of the handbrake lever sample and ensuring effective parking within the EPB actuator's travel range. However, the effectiveness of the dual self-adjustment mechanism in EPB drum brake assemblies is currently only verified through traditional lining wear rate tests, which is not only costly in terms of manpower and resources but also takes too long.

[0004] Therefore, how to overcome the above-mentioned technical defects is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a test device for verifying the effectiveness of the dual self-adjustment mechanism of the EPB drum brake, which can realize the rapid verification of the effectiveness of the dual self-adjustment mechanism of the EPB drum brake. It can not only save a lot of manpower and material resources, but also be easy to operate and highly reliable.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A test apparatus for verifying the effectiveness of the dual self-adjusting mechanism of an EPB drum brake includes a test platform and a brake drum sample, a brake shoe sample, a parking self-adjusting mechanism sample, and a driving self-adjusting mechanism sample disposed on the test platform.

[0008] The brake shoe sample includes a front shoe sample and a rear shoe sample. Both the front shoe sample and the rear shoe sample include a steel back sample and a brake shoe liner sample. The vehicle self-adjusting mechanism sample is connected between the front shoe sample and the rear shoe sample to adjust the gap between the brake shoe sample and the brake drum sample to a preset gap. The brake shoe liner sample is disposed on the steel back sample. The friction surface of the brake drum sample and / or the brake shoe liner sample is provided with a friction part for improving the roughness of the friction surface.

[0009] The parking self-adjusting mechanism prototype includes a self-adjusting lever prototype, a pawl prototype, and a pawl pin prototype. One end of the self-adjusting lever prototype is connected to the pawl prototype, and the other end is connected to the handbrake lever prototype. The pawl prototype and the pawl pin prototype are rotatably connected. A hoof hole is provided on the front hoof prototype, and the pawl prototype is placed in the hoof hole.

[0010] Optionally, the friction part is a groove.

[0011] Optionally, the grooves are multiple and intersect each other, so that the friction surface has multiple intersecting grids.

[0012] Optionally, the depth of the groove is 1mm-2mm.

[0013] Optionally, the friction part may consist of multiple protrusions.

[0014] Optionally, the friction part consists of multiple pits.

[0015] Optionally, the friction part is a friction layer coated on the friction surface, and the roughness of the friction layer is greater than the roughness of the friction surface.

[0016] Optionally, the thickness of the friction layer is less than 0.5 mm.

[0017] Optionally, the width of the brake shoe liner sample is 1 / 3 to 1 / 2 of the width of the steel back sample.

[0018] Optionally, the forehoof sample has an opening for the connecting cable of the connecting arm to extend into.

[0019] As can be seen from the above technical solution, when conducting the effectiveness test verification of the dual self-adjusting mechanism of the EPB drum brake, the brake drum sample, brake shoe sample, parking self-adjusting mechanism sample, and driving self-adjusting mechanism sample are first installed on the test bench according to the actual vehicle installation state. At the same time, the length of the parking self-adjusting mechanism sample is adjusted to the shortest possible value, that is, the front side of the pawl sample contacts one side of the shoe hole, and there is a gap D between the back side and the other side of the shoe hole. The gap between the brake shoe lining sample and the brake drum sample is adjusted to the preset gap. Then, driving and parking brake tests are started. When the driving brake test is conducted, the brake cylinder sample is activated. Under the action of the brake cylinder sample, the brake shoe sample opens outward, and the brake shoe lining sample is positioned within the parking self-adjusting mechanism sample. The opening stroke of the part is C. During the test, the brake shoe lining sample and the brake drum sample continuously rub against each other, causing the brake shoe lining sample to gradually thin and the preset gap to continuously increase. In order to restore the preset gap to the initial state, the vehicle self-adjusting mechanism sample needs to be continuously adjusted. Under the action of the vehicle self-adjusting mechanism sample, the brake shoe sample continuously expands outward to maintain the preset gap between the brake shoe lining sample and the brake drum sample unchanged. However, as the brake shoe lining sample continuously expands outward, the gap D gradually decreases. When the gap D is less than the stroke C, when parking, the hole wall of the shoe hole contacts the back side of the pawl sample, causing the pawl sample to rotate around the pawl pin sample, causing the parking self-adjusting mechanism sample to grow, so as to achieve parking compensation. Among them, the stroke C is as follows: Figure 3 As shown, the gap D is as follows Figure 4 and Figure 5 As shown.

[0020] Compared with the prior art, the brake drum sample 100 and / or brake shoe liner sample 204 disclosed in this utility model embodiment are provided with a friction part 700 for improving the roughness of the friction surface. This increases the roughness of the friction surface of the brake drum sample 100 and / or brake shoe liner sample 204. Therefore, the wear rate of the brake drum sample 100 and / or brake shoe liner sample 204 can be increased during the test, which can realize the rapid verification of the effectiveness of the dual self-adjustment mechanism of the EPB drum brake. This not only saves a lot of manpower and material resources, but also is convenient to operate and highly reliable. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1This is an assembly diagram of the brake drum sample and brake shoe sample disclosed in the embodiments of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the brake shoe sample disclosed in the embodiment of this utility model;

[0024] Figure 3 This is a schematic diagram of the opening stroke of the parking self-adjusting mechanism sample disclosed in the embodiments of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the parking self-adjusting mechanism sample fitting disclosed in the embodiment of this utility model;

[0026] Figure 5 for Figure 4 Enlarged structural diagram at point A;

[0027] Figure 6 This is a schematic diagram of the structure of the forehoof sample disclosed in the embodiments of this utility model;

[0028] Figure 7 This is a schematic diagram of the friction surface of the brake drum sample disclosed in the embodiment of this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 100. Brake drum sample; 200. Brake shoe sample; 201. Front shoe sample; 2011. Shoe hole; 202. Rear shoe sample; 203. Steel backing sample; 204. Brake shoe lining sample; 300. Parking self-adjusting mechanism sample; 301. Self-adjusting lever sample; 302. Pad sample; 303. Pad pin sample; 400. Travel self-adjusting mechanism sample; 500. Handbrake lever sample; 600. Brake cylinder sample; 700. Friction part. Detailed Implementation

[0031] In view of this, the core of this utility model is to provide a test device for verifying the effectiveness of the dual self-adjustment mechanism of the EPB drum brake. It can realize the rapid verification of the effectiveness of the dual self-adjustment mechanism of the EPB drum brake, which can not only save a lot of manpower and material resources, but also is convenient to operate and highly reliable.

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please refer to Figures 1-7The test device disclosed in this utility model embodiment for verifying the effectiveness of the dual self-adjustment mechanism of the EPB drum brake includes a test platform and a brake drum sample 100, a brake shoe sample 200, a parking self-adjustment mechanism sample 300, and a driving self-adjustment mechanism sample 400 disposed on the test platform.

[0034] The brake shoe sample 200 includes a front shoe sample 201 and a rear shoe sample 202. Both the front shoe sample 201 and the rear shoe sample 202 include a steel back sample 203 and a brake shoe liner sample 204. The vehicle self-adjusting mechanism sample 400 is connected between the front shoe sample 201 and the rear shoe sample 202 to adjust the gap between the brake shoe sample 200 and the brake drum sample 100 as a preset gap. The brake shoe liner sample 204 is disposed on the steel back sample 203. The friction surface of the brake drum sample 100 and / or the brake shoe liner sample 204 is provided with a friction part 700 for improving the roughness of the friction surface.

[0035] The parking self-adjusting mechanism sample 300 includes a self-adjusting lever sample 301, a pawl sample 302, and a pawl pin sample 303. One end of the self-adjusting lever sample 301 is connected to the pawl sample 302, and the other end is connected to the handbrake lever sample 500. The pawl sample 302 and the pawl pin sample 303 are rotatably connected. The front hoof sample 201 has a hoof hole, and the pawl sample 302 is placed in the hoof hole.

[0036] When verifying the effectiveness of the dual self-adjusting mechanism of the EPB drum brake, the brake drum sample 100, brake shoe sample 200, parking self-adjusting mechanism sample 300, and driving self-adjusting mechanism sample 400 are first installed on the test bench according to the actual vehicle installation state. Simultaneously, the length of the parking self-adjusting mechanism sample 300 is adjusted to its shortest length, i.e., the front side of the pawl sample 302 contacts one side of the shoe hole 2011, and there is a gap D between the back side and the other side of the shoe hole. The gap between the brake shoe lining sample 204 and the brake drum sample 100 is adjusted to a preset gap. Then, driving and parking brake tests are started. During the driving brake test, the brake cylinder sample 600 is activated. Under the action of the brake cylinder sample 600, the brake shoe sample 200 opens outwards. The opening of the brake shoe lining sample 204 at the parking self-adjusting mechanism sample 300... As shown in the figure C, during the test, the brake shoe lining sample 204 and the brake drum sample 100 continuously rub against each other, causing the brake shoe lining sample 204 to gradually become thinner and the preset gap to continuously increase. In order to restore the preset gap to the initial state, the vehicle self-adjusting mechanism sample 400 needs to be continuously adjusted. Under the action of the vehicle self-adjusting mechanism sample 400, the brake shoe sample 200 continuously expands outward to keep the preset gap between the brake shoe lining sample 204 and the brake drum sample 100 unchanged. However, as the brake shoe lining sample 204 continuously expands outward, the gap D gradually decreases. When the gap D is less than the stroke C, when parking, the hole wall of the shoe hole 2011 contacts the back side of the pawl sample 302, causing the pawl sample 302 to rotate around the pawl pin sample 303, causing the parking self-adjusting mechanism sample 300 to grow, so as to achieve parking compensation.

[0037] Compared with the prior art, the brake drum sample 100 and / or brake shoe liner sample 204 disclosed in this utility model embodiment are provided with a friction part 700 for improving the roughness of the friction surface. This increases the roughness of the friction surface of the brake drum sample 100 and / or brake shoe liner sample 204. Therefore, the wear rate of the brake drum sample 100 and / or brake shoe liner sample 204 can be increased during the test, which can realize the rapid verification of the effectiveness of the dual self-adjustment mechanism of the EPB drum brake. This not only saves a lot of manpower and material resources, but also is convenient to operate and highly reliable.

[0038] It should be noted that the friction part 700 can be provided only on the brake drum sample 100 or only on the brake shoe liner sample 204. Such a configuration can improve the friction between the brake drum sample 100 and the brake shoe sample 200.

[0039] Before the specific test, paint pens can be used to mark the self-adjusting mechanism sample 400 and the parking self-adjusting mechanism sample 300 for easy identification. During the test, the brake drum sample 100 can be checked and cleaned after every 5,000 to 10,000 braking cycles. Specifically, the brake drum sample 100 is opened and the wear debris inside is cleaned. Then, the free travel record of the handbrake lever sample 500 is checked, and the friction part is re-set on the friction surface of the brake drum sample 100. A constant pressure needs to be input during the test.

[0040] The free travel of the handbrake lever sample refers to the travel of the cable input end of the handbrake lever sample 500 in the direction of the pulling force when a pulling force of no more than 15N is applied to the cable input end.

[0041] Of course, friction parts 700 can also be provided on the brake drum sample 100 and the brake shoe liner sample 204 respectively, so as to improve the friction effect and shorten the test time.

[0042] This embodiment of the utility model does not limit the specific structure of the friction part 700. Any structure that meets the usage requirements of this utility model is within the protection scope of this utility model.

[0043] As a first embodiment of the present invention, the friction part 700 disclosed in this embodiment is a groove.

[0044] This utility model embodiment does not limit the specific arrangement of the groove. Any arrangement that meets the usage requirements of this utility model is within the protection scope of this utility model.

[0045] As a specific embodiment, the grooves disclosed in this utility model embodiment are multiple and intersecting with each other, so that the friction surface has multiple intersecting grids.

[0046] Of course, multiple grooves can also be arranged in parallel so that the friction surface has multiple parallel grids.

[0047] The groove depth is preferably 1mm-2mm.

[0048] As a second embodiment of the present invention, the friction part 700 disclosed in this embodiment of the present invention may also be a plurality of protrusions or a plurality of recesses.

[0049] The multiple protrusions or multiple pits can be arranged according to a preset pattern or set irregularly, and those skilled in the art can choose according to their needs.

[0050] As a third embodiment of the present invention, the friction part 700 disclosed in this embodiment is a friction layer coated on the friction surface, wherein the roughness of the friction layer is greater than the roughness of the friction surface.

[0051] The thickness of the friction layer is preferably less than 0.5 mm.

[0052] As a further embodiment, the width of the brake shoe lining sample 204 disclosed in this utility model embodiment is 1 / 3 to 1 / 2 of the width of the steel backing sample. This design reduces the friction area of ​​the brake shoe lining sample 204, thereby further increasing the wear rate of the brake shoe lining sample 204. This allows for the verification of the effectiveness of the dual self-adjusting mechanism of the EPB drum brake in a shorter time, thus greatly saving manpower and resources and improving operational convenience and reliability.

[0053] As a specific embodiment, the width of the brake shoe lining sample 204 disclosed in this utility model embodiment is 1 / 3 to 1 / 2 of the width of the original brake shoe lining sample 204.

[0054] As a further embodiment, the forehoof sample 201 disclosed in this utility model embodiment has an opening for the connecting cable of the connecting arm to extend into.

[0055] This utility model embodiment does not limit the specific type of connecting cable. Any connecting cable that meets the usage requirements of this utility model is within the protection scope of this utility model.

[0056] As a specific embodiment, the connecting cable disclosed in this utility model embodiment is preferably iron wire, which is not only easy to obtain but also inexpensive.

[0057] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0058] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0059] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A test device for verifying the effectiveness of a dual self-adjusting mechanism of an EPB drum brake, characterized by, The test platform, and a brake drum sample, a brake shoe sample, a parking self-adjusting mechanism sample and a running self-adjusting mechanism sample arranged on the test platform; The brake shoe sample comprises a front shoe sample and a rear shoe sample, each of the front shoe sample and the rear shoe sample comprises a steel back sample and a brake shoe lining sample, the running self-adjusting mechanism sample is connected between the front shoe sample and the rear shoe sample to adjust the gap between the brake shoe sample and the brake drum sample to be a preset gap, the brake shoe lining sample is arranged on the steel back sample, and a friction part for improving roughness of a friction surface of the brake drum sample and / or the brake shoe lining sample is arranged on the friction surface. The parking self-adjusting mechanism sample comprises a self-adjusting rod sample, a pawl sample and a pawl pin sample, one end of the self-adjusting rod sample is connected with the pawl sample, the other end is connected with a hand brake lever sample, the pawl sample is rotationally connected with the pawl pin sample, the front shoe sample is provided with a shoe hole, and the pawl sample is arranged in the shoe hole.

2. The test device for verifying the effectiveness of the EPB drum brake dual self-adjusting mechanism according to claim 1, characterized by, The friction part is a groove.

3. The test device for verifying the effectiveness of the EPB drum brake dual self-adjusting mechanism according to claim 2, characterized by, The grooves are multiple and cross each other, so that the friction surface has multiple cross grids.

4. The test device for verifying the effectiveness of the EPB drum brake dual self-adjusting mechanism according to claim 2, characterized by, The depth of the groove is 1mm-2mm.

5. The test device for verifying the effectiveness of the EPB drum brake dual self-adjusting mechanism according to claim 1, characterized by, The friction part is multiple convex points.

6. The test device for verifying the effectiveness of the EPB drum brake dual self-adjusting mechanism according to claim 1, characterized by, The friction part is multiple concave pits.

7. The test device for verifying the effectiveness of the EPB drum brake dual self-adjusting mechanism according to claim 1, characterized by, The friction part is a friction layer coated on the friction surface, and the roughness of the friction layer is greater than that of the friction surface.

8. The test device for verifying the effectiveness of the EPB drum brake dual self-adjusting mechanism according to claim 7, characterized by, The thickness of the friction layer is less than 0.5mm.

9. The test device for verifying the effectiveness of the EPB drum brake dual self-adjusting mechanism according to claim 1, characterized by, The width of the brake shoe lining sample is 1 / 3-1 / 2 of the width of the steel back sample.

10. The test device for verifying the effectiveness of the EPB drum brake dual self-adjusting mechanism according to claim 1, characterized by, The front shoe sample is provided with an opening hole for a connecting rope of a pull arm to extend into.

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