A noise reduction sheet for automobile brake pads
By designing a sound-absorbing pad structure with rounded edges and open grooves on the car brake pads, combined with the flanged edges of the metal and rubber buffer layers, the problem of excessive braking noise has been solved, achieving noise reduction and improved comfort.
Patent Information
- Application Number
- CN202520111380.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2035-01-17
AI Technical Summary
Existing vehicles have serious noise problems during braking, which affects driving and riding comfort. In particular, the braking noise exceeds 76dB and needs to be further reduced to meet automotive industry standards.
Design a noise-reducing pad for automotive brake blocks, with a rounded edge and symmetrical opening grooves in the lower middle part, and metal and rubber buffer layers on both sides to ensure balanced force on the piston rings and reduce collision noise between the brake block and the brake bracket.
It effectively reduces braking noise, improves driving comfort, and meets the automotive industry standard of braking noise less than 76dB.
Smart Images
Figure CN223609162U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of automobile friction material production, especially an automobile brake block's sound elimination piece. BACKGROUND
[0002] With the rapid rise of modern automobile industry, the requirement of automobile comfort is also increasing, and with the progress of automobile electrification, the noise is more strictly required compared with the original fuel vehicle. When the automobile brakes, the noise will be transmitted to the vehicle interior through the chassis and the vehicle body, which not only affects the comfort of the driver and the passenger, but also seriously endangers the health of the driver and the passenger. Generally, the noise with a frequency less than 1000Hz is called tremor, and the noise with a frequency between 1000-20000Hz is called brake screaming, and the brake sharp noise with too high decibel causes unnecessary discomfort to pedestrians and surrounding residents on the road. According to the automobile industry standard QC / T 564-2018, when carrying out bench test, the brake noise must be less than 76dB. The automobile is composed of thousands of parts, and the performance optimization of the parts plays an important role in the performance optimization of the whole vehicle. In the problem of noise optimization, in addition to a certain degree of noise optimization in the selection of brake block formula, the sound elimination piece also plays an important role in the problem of noise optimization. As an important means of eliminating brake noise, how to further reduce brake noise and improve the comfort of driving the whole vehicle by optimizing the structure of the sound elimination piece is a problem to be solved at present. SUMMARY
[0003] In view of the problems in the background art, the utility model provides a sound elimination piece of automobile brake block to solve the problem of how to further reduce the brake noise of the vehicle and improve the comfort of driving.
[0004] In order to achieve the purpose of the utility model, the utility model provides a sound elimination piece of automobile brake block, the brake block is driven by the piston ring to apply the brake force, and the innovation point is that: the lower part of the sound elimination piece is provided with a circular arc edge, the circular arc edge protrudes downward, one opening groove is arranged on the two sides of the circular arc edge respectively, the two opening grooves are symmetrically arranged, the inner side of the opening groove is formed by extending from the circular arc edge, the outer side of the opening groove is arc-shaped, the outer side and the inner side are concentrically arranged, the diameter of the circular arc edge is less than the inner diameter of the piston ring, and the diameter of the outer side is greater than the outer diameter of the piston ring.
[0005] Further, one flange is arranged on each side of the sound elimination piece, and the two flanges are symmetrically arranged, the flange comprises a metal layer and a buffer layer, the buffer layer is arranged on the inner side of the metal layer, and the buffer layer is made of rubber.
[0006] Furthermore, the bottom edge of the opening groove extends radially along the arc edge, and the included angle between the bottom edges of the two opening grooves is 160°.
[0007] Furthermore, the angle between the plane of the flange and the main surface of the sound-absorbing sheet is 90°, the width of the flange is 7mm, and the height of the flange is 5.2mm.
[0008] The method of this utility model has the following beneficial effects: by installing this noise-absorbing sheet on the brake block, the noise during vehicle braking can be greatly reduced, and the driving comfort can be significantly improved. Attached Figure Description
[0009] The accompanying drawings of this utility model are described below.
[0010] Appendix Figure 1 This is a schematic diagram of the structure of this utility model;
[0011] Appendix Figure 2 For the appendix Figure 1 The left view;
[0012] Appendix Figure 3 This is a schematic diagram of the flange installation structure.
[0013] In the diagram: 1. Arc edge; 2. Opening groove; 3. Inner side edge; 4. Outer side edge; 5. Groove bottom edge; 6. Flanged edge; 7. Brake block; 8. Brake bracket; 61. Metal layer; 62. Buffer layer; 1-1. Piston ring. Detailed Implementation
[0014] The present invention will be further described below with reference to the embodiments.
[0015] As attached Figure 1 The diagram shows a noise-dampening slab for a car brake pad. The brake pad is driven by a piston ring 1-1 to apply braking force. The lower middle part of the noise-dampening slab has an arc-shaped edge 1 that protrudes downwards. An opening groove 2 is provided on each side of the arc-shaped edge 1, symmetrically arranged. The inner side 3 of the opening groove 2 extends from the arc-shaped edge 1, and the outer side 4 of the opening groove 2 is arc-shaped and concentrically arranged with the inner side 3. The diameter of the arc-shaped edge 1 is smaller than the inner diameter of the piston ring 1-1, and the diameter of the outer side 4 is larger than the outer diameter of the piston ring 1-1. The bottom edge 5 of the opening groove 2 extends radially along the arc-shaped edge 1, and the included angle C between the bottom edges 5 of the two opening grooves 2 is 160°.
[0016] As attached Figure 1 and attached Figure 2The sound-absorbing sheet has a flange 6 on each side, arranged symmetrically. Each flange 6 includes a metal layer 61 and a buffer layer 62, with the buffer layer 62 located inside the metal layer 61 and made of rubber. The angle between the plane of the flange 6 and the main surface of the sound-absorbing sheet is 90°. The width A of the flange 6 is 7mm, and the height B of the flange 6 is 5.2mm.
[0017] The inventive principle of this utility model is as follows:
[0018] When a vehicle brakes, the brake piston applies pressure to push the brake pads against the brake disc. Braking and deceleration are achieved through the friction between the brake pads and the brake disc. In existing technology, the braking noise between the brake pads and the brake disc is relatively large. The inventors have discovered that when the brake piston presses on the brake pads, because the front face of the brake piston is annular, the lower middle part of the piston ring completely covers the plane of the friction pads, while the upper part of the piston ring extends beyond the plane of the friction pads, which is equivalent to the upper part of the piston ring being suspended. When the vehicle brakes, the force on the upper and lower parts of the piston rings is actually uneven when the piston rings push the brake pads. Moreover, at the moment of braking, the lower part of the brake pads is under greater force and even has a tendency to flip upwards. This causes the lower part of the friction pads to contact the brake disc earlier at the moment of braking, and due to the uneven pressure, a large amount of friction noise is generated. The inventor creatively designed an arc groove at the bottom of the muffler, allowing the bottom of the piston ring to be suspended as well. This ensures that the piston ring applies a balanced force to the friction pad from top to bottom. When the vehicle brakes, the piston ring pushes the brake pad, causing the entire surface of the friction pad to contact the brake disc with a balanced force, thus significantly reducing noise.
[0019] Furthermore, adding a bent flange to both sides of the muffler is to provide a buffer between the brake pad 7 and the brake bracket 8. The inventors discovered that when the vehicle brakes, the brake pad contacts the brake disc, and the forward rotation of the brake disc causes the brake pad to vibrate to a certain extent. At this time, the brake pad will collide with the brake bracket at a certain frequency, thus generating considerable noise. (See attached image) Figure 3 As shown, when the muffler is installed on the brake block, the flange 6 of this utility model actually wraps around the side of the brake block 7. The inner side of the flange 6 is provided with a rubber layer, which is equivalent to setting a buffer layer between the brake block 7 and the brake bracket 8. When the vehicle brakes and the brake block 7 collides with the brake bracket 8, the braking noise will be significantly reduced due to the buffering of the rubber buffer layer of the flange 6.
Claims
1. A sound deadening sheet for a brake pad of an automobile, the brake pad applying a braking force by a piston ring drive, characterized by: The middle and lower part of the sound attenuation sheet is provided with a circular arc edge which protrudes downward, two opening grooves are symmetrically arranged on both sides of the circular arc edge, the inner side of the opening groove is formed by the extension of the circular arc edge, the outer side of the opening groove is in the shape of a circular arc, the outer side and the inner side are concentrically arranged, the diameter of the circular arc edge is smaller than the inner diameter of the piston ring, and the diameter of the outer side is larger than the outer diameter of the piston ring.
2. The sound attenuating pad for an automotive brake pad of claim 1 wherein: Two flanges are symmetrically arranged on both sides of the sound attenuation sheet, the flange comprises a metal layer and a buffer layer, the buffer layer is arranged on the inner side of the metal layer, and the buffer layer is made of rubber.
3. The sound-damping sheet for an automobile brake pad according to claim 1 or 2, wherein: The groove bottom edges of the two opening grooves extend along the radial direction of the circular arc edge, and the included angle between the groove bottom edges of the two opening grooves is 160°.
4. The sound attenuating pad for an automotive brake pad of claim 2 wherein: The included angle between the plane of the flange and the main body surface of the sound attenuation sheet is 90°, the width of the flange is 7mm, and the height of the flange is 5.2mm.