A gasket for a brake pad of an automobile

Abstract

The utility model provides a kind of gasket of automobile brake friction block, the gasket is arranged in the back of brake friction block, when braking, the gasket is contacted with the piston end surface of brake caliper, it is characterized by: the upper part of the gasket is provided with opening, the opening is set to upward;When the piston end surface is contacted with gasket, the part of piston end surface higher than the bottom edge of opening is not blocked by the gasket of opening periphery relative to the orthographic projection of gasket plane.The gasket of the utility model can greatly reduce the noise when vehicle braking, and significantly improve the driving comfort.

Description

Technical Field

[0001] This utility model relates to the field of automotive friction material production technology, and in particular to a gasket for automotive brake friction blocks. Background Technology

[0002] With the rapid rise of the modern automotive industry, the demand for automotive comfort is also increasing. Currently, with the advancement of vehicle electrification, there are even stricter requirements for noise levels compared to traditional gasoline-powered vehicles. Because the materials of brake pads (brake friction blocks) and brake discs are not perfectly smooth, the coefficient of friction fluctuates slightly during braking due to changes in temperature, pressure, and speed. This causes a high-frequency "stick-slip" phenomenon, resulting in vibration. Alternatively, minor unevenness, hard spots, or impurities on the surfaces of the brake pads and discs can also cause changes in friction, leading to vibration. These vibrations can cause other components to vibrate simultaneously, generating noise. Since noise is transmitted to the vehicle interior through the chassis and body, automotive braking noise can harm the health and comfort of the driver and passengers. Noise with a frequency below 1000Hz is generally called vibration, while noise with a frequency between 1000-17000Hz is called brake screeching. Excessively high decibel levels of brake screeching can also cause unnecessary disturbance to pedestrians and nearby residents. According to the automotive industry standard QCT564-2018, when conducting bench tests, the braking noise must be less than 76dB. Automobiles are composed of thousands of parts, and optimizing the performance of these parts plays an indispensable role in optimizing the overall performance of the vehicle. Minimizing the noise generated during braking is also a research direction for optimizing the structure of automotive brake friction blocks. Utility Model Content

[0003] In view of the problems in the background technology, this utility model provides a gasket for automotive brake friction blocks to solve the problem of how to further reduce vehicle braking noise and improve driving comfort.

[0004] To achieve the purpose of this utility model, this utility model provides a gasket for automotive brake friction blocks. The gasket is disposed on the back of the brake friction block. During braking, the gasket contacts the piston end face of the brake caliper. The innovation lies in the fact that the upper middle part of the gasket is provided with an opening facing upwards. When the piston end face contacts the gasket, the orthographic projection of the portion of the piston end face above the bottom edge of the opening relative to the gasket plane is not blocked by the gasket around the opening.

[0005] Furthermore, the bottom edge of the opening is horizontally positioned, and both sides of the opening are perpendicular to the bottom edge.

[0006] Furthermore, the bottom edge of the opening is horizontal, and the two sides of the opening are arc-shaped.

[0007] Furthermore, the openings are symmetrically arranged on the left and right sides along the transverse center of symmetry of the gasket.

[0008] The method of this utility model has the following beneficial effects: by installing this shim on the friction 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 a gasket in the prior art; Appendix Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present utility model; Appendix Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Appendix Figure 4 A cross-sectional view showing the positional relationship between the brake caliper piston and the existing brake friction block during braking; Appendix Figure 5 This is a cross-sectional view showing the positional relationship between the piston of the brake caliper and the brake friction block using the gasket of this invention during braking.

[0011] In the diagram: 1. Gasket; 2. Piston; 3. Muffler; 4. Backplate; 11. Bottom edge; 12. Side edge. Detailed Implementation

[0012] The present invention will be further described below with reference to the embodiments. Example 1:

[0013] As attached Figure 2 The illustrated car brake friction pad 1 has an opening in its upper middle part, the opening facing upwards, the bottom edge 11 of the opening being horizontal, and both sides 12 of the opening being perpendicular to the bottom edge; when the end face of the piston 2 contacts the pad 1, the orthographic projection of the portion of the piston 2 end face above the bottom edge 11 of the opening relative to the plane of the pad 1 is not obstructed by the pads around the opening; the opening is symmetrically arranged left and right along the transverse center of symmetry of the pad 1. Example 2:

[0014] As attached Figure 3 As shown, except that the two sides 12 of the opening are arc-shaped, the other technical features are the same as those in Embodiment 1.

[0015] The opening structure in Example 1 is easy to process and can save processing costs, while the opening structure in Example 2 has better rigidity.

[0016] The inventive principle of this utility model is as follows: When a vehicle brakes, the piston of the brake caliper applies pressure to push the brake friction pads onto the brake disc. Braking and deceleration are achieved through the friction between the brake friction pads and the brake disc. However, in the existing technology, the braking noise between the brake friction pads and the brake disc is relatively large.

[0017] As attached Figure 1 As shown, the piston end face first contacts the gasket on the back of the brake pad (a sound-dampening slab 3 and a backing plate 4 are also arranged behind the gasket in sequence), and the upper part of the piston end face is usually higher than the brake friction block. The inventors discovered that when the vehicle brakes and the piston of the brake caliper applies force to press on the gasket, pushing the brake friction block to contact the brake disc, the piston end face will slightly flip upwards, as shown in the attached figure. Figure 4 As shown, in the existing technology, the piston end face and the top edge of the gasket form line contact, resulting in significant uneven force distribution and thus considerable braking noise. However, with the structure of this invention, as shown in the attached diagram... Figure 2 Or attached Figure 3 As shown, an opening is provided at the upper part of the gasket, causing the upper edge of the gasket in contact with the piston end face to move downwards. When the vehicle brakes, as shown in the attached diagram... Figure 5 As shown, when the piston end face flips up, the top of the piston end face is blocked by the silencing plate. On the one hand, this prevents the piston from flipping up further. On the other hand, the piston end face contacts the upper edge of the silencing plate and the lower edge of the gasket opening, respectively. The two contact lines form a large contact force range, which is equivalent to forming a force-bearing surface. This makes the force between the piston and the brake friction block more uniform, which greatly reduces braking noise.

Claims

1. A gasket for an automotive brake friction block, the gasket being disposed on the back of the brake friction block, wherein during braking, the gasket contacts the piston end face of the brake caliper, characterized in that: The gasket has an opening in its upper middle part, and the opening faces upward; when the piston end face contacts the gasket, the orthographic projection of the portion of the piston end face above the bottom edge of the opening relative to the gasket plane is not blocked by the gasket around the opening.

2. The gasket for an automotive brake friction block as described in claim 1, characterized in that: The bottom edge of the opening is horizontal, and both sides of the opening are perpendicular to the bottom edge.

3. The gasket for an automotive brake friction block as described in claim 1, characterized in that: The bottom edge of the opening is horizontal, and both sides of the opening are arc-shaped.

4. The gasket of the automotive brake friction block as described in any one of claims 1 to 3, characterized in that: The openings are symmetrically arranged on the left and right sides of the transverse center of symmetry of the gasket.

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