Fixed brake caliper without low-frequency noise

Abstract

The utility model relates to the field of brakes, and discloses a fixed brake caliper without low-frequency noise, which comprises a caliper body, the caliper body consists of an inner caliper body and an outer caliper body, a jaw is formed on one side, close to a brake disc, of the caliper body, a caliper back is arranged on one side, far away from the brake disc, of the caliper body, and a caliper back opening is formed on the caliper back; a guide rod is installed in the caliper back opening and arranged in the axial direction, and the inner brake block and the outer brake block are arranged on the guide rod in a sleeving mode and located at the two ends of the guide rod. An arc-shaped noise reduction blocking piece is formed on the outer edge of the caliper back opening of the outer brake block, and the outer brake block is located on the inner side of the noise reduction blocking piece. The brake caliper has the advantages of being stable and reliable in structure, neater in appearance, few in parts, free of low-frequency noise and the like.

Description

Technical Field

[0001] The utility model relates to the field of brakes, in particular to a fixed brake caliper without low-frequency noise. Background Art

[0002] Fixed calipers are prone to kHz low-frequency noise. This is usually solved by adding a mass block to the brake pad. The mass block has high weight requirements and is produced by precision casting, which is costly and affects the market price competitiveness of the product. For example, Chinese patent CN202111591010.3 discloses a low-drag and smooth return system for a fixed caliper, which needs to be equipped with a counterweight to eliminate low-frequency noise. Utility Model Content

[0003] The utility model aims at the shortcomings of the prior art and provides a fixed brake caliper without low-frequency noise.

[0004] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0005] A fixed brake caliper without low-frequency noise comprises a caliper body, the caliper body is composed of an inner caliper body and an outer caliper body, a caliper opening is formed on a side of the caliper body close to a brake disc, and a caliper back is formed on a side away from the brake disc, and a caliper back opening is formed on the caliper back;

[0006] A guide rod is installed in the back opening of the caliper, and the guide rod is arranged axially. The inner brake block and the outer brake block are sleeved on the guide rod and located at both ends of the guide rod; the outer brake block is formed with an arc-shaped noise reduction baffle on the outer edge of the back opening of the caliper, and the outer brake block is located on the inner side of the noise reduction baffle.

[0007] Preferably, the side surfaces of the pliers body on the left and right sides of the pliers back opening are arc-shaped surfaces, the edge of the noise reduction baffle is arc-shaped, and the arc and the side surfaces of the pliers body are located on an arc line.

[0008] Preferably, the noise reduction baffle is an arc-shaped sheet structure, and the noise reduction baffle and the outer clamp body are an integrally formed structure.

[0009] Preferably, the outer pliers body includes a base, a mounting seat protruding from the outer side of the base, connecting parts are formed at both ends of the inner side of the base, the back opening of the pliers and the jaws are formed between the connecting parts, the limit baffle is a part of the base and is located on the outer side of the mounting seat, the side of the base plate is an arc-shaped structure, and the side of the connecting part has the same curvature as the side of the base plate.

[0010] Preferably, no counterweight is provided at the end of the brake block.

[0011] Preferably, the inner caliper body and the outer caliper body are of split design, and the connecting holes of the inner caliper body and the outer caliper body are arranged on the caliper body on both sides of the caliper back opening, wherein the connecting hole on the outer caliper body is a blind hole, and the connecting hole on the inner caliper body is a through hole, and the through hole and the blind hole are fixed by bolt connection.

[0012] Preferably, it further comprises a return spring, and two ends of the return spring are respectively supported on the inner brake block and the outer brake block.

[0013] The utility model adopts the above technical solution, and has the following significant technical effects:

[0014] Compared with traditional calipers, the fixed brake caliper designed by the utility model changes the natural frequency of the fixed caliper by adjusting the shape of the caliper body on the outer side of the fixed caliper without adding mass blocks, thereby preventing frequency coupling between components under complex modal conditions and effectively reducing the occurrence rate of low-frequency noise of the fixed caliper. The four mass blocks on each caliper are cancelled. Although the weight and cost of the outer caliper increase after adjustment, the cost is still saved compared to 4 mass blocks. The weight of the outer caliper of the new structure increases by 0.22kg, which is about 7.7 yuan at 35 yuan / kg; the mass block is estimated at 4.0 yuan / piece*4, totaling 16 yuan; the estimated cost is reduced by 10.6 yuan / piece, and the product cost performance is effectively improved, and the market competitiveness is stronger. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the prior art.

[0016] Figure 2 It is a structural schematic diagram of the caliper of this scheme.

[0017] Figure 3 It is a schematic diagram of the structure of the outer clamp body.

[0018] Figure 4 It is a schematic diagram of the structure of the outer clamp body.

[0019] Figure 5 It is a schematic diagram of the structure of the outer clamp body.

[0020] The technical names of the figures marked in the figure are: 1-inner caliper body, 2-outer caliper body, 3-jaw opening, 4-jaw back opening, 5-guide rod, 6-noise reduction baffle, 7-inner brake block, 8-outer brake block, 9-arc surface, 10-base, 11-mounting seat, 12-connecting part, 13-reinforcement rib, 14-connecting hole, 15-return spring. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] Example 1

[0023] A fixed brake caliper without low-frequency noise comprises a caliper body, the caliper body being composed of an inner caliper body 1 and an outer caliper body 2, a caliper opening 3 being formed on the side of the caliper body close to the brake disc, and a caliper back being formed on the side away from the brake disc, and a caliper back opening 4 being formed on the caliper back; in this scheme, the caliper is a split caliper body, and the inner caliper body 1 and the outer caliper body 2 are both castings.

[0024] The jaw 3 is used to place the brake disc, and the jaw back opening 4 is located on the back side of the jaw 3. A guide rod 5 is installed in the jaw back opening 4, and the guide rod 5 is arranged along the axial direction. Specifically, there are two guide rods 5 and they are arranged parallel to each other. This part is designed in the prior art.

[0025] The inner brake block 7 and the outer brake block 8 described in this embodiment are sleeved on the guide rod 5 and are located at both ends of the guide rod 5; the outer brake block 8 is formed with an arc-shaped noise reduction baffle 6 at the outer edge of the caliper back opening 4, and the outer brake block 8 is located on the inner side of the noise reduction baffle 6. Both ends of the inner brake block 7 and the outer brake block 8 are guided by the guide rod 5, and then supported by the return spring 15 to achieve the balance of the brake block. The noise reduction baffle 6 is added to increase the mass of the caliper body to eliminate the low-frequency noise caused by removing the brake block.

[0026] In this embodiment, the side surfaces of the pliers body on the left and right sides of the pliers back opening 4 are arc-shaped surfaces 9, the edge of the noise reduction baffle 6 is arc-shaped, and the arc and the side surface of the pliers body are located on an arc line. The advantage of the overall arc-shaped structure is that the appearance is more integrated, neat, and better integrated. At the same time, the low-frequency noise is reduced by the following aspects.

[0027] Natural circular frequency of free vibration of a single mass system Stiffness; m: mass m, natural frequency It can be seen that increasing mass can reduce the natural frequency, and reducing mass can increase the natural frequency; however, the caliper body has deformation requirements for different hydraulic pressures. Reducing mass under the same external shape means thinning the wall thickness and increasing the deformation, which is not conducive to the performance requirements of the caliper body. It is more reasonable to choose a solution with increased mass. At the same time, the caliper body also has specific assembly clearance setting value requirements with the surrounding assembly environment parts in the assembly relationship of the front brake angle assembly. CAE analysis and actual tests of the inner caliper show that the deformation under different hydraulic conditions is very small, but the deformation of the external shape is more than 1 times larger than that of the inner caliper. Finally, the solution of increasing mass only on the outer caliper is selected to adjust the natural frequency. The specific structure is to change the shape of the top of the outer caliper into an arc shape, which naturally connects with the arcs on both sides. Under braking conditions, the brake pad of the fixed caliper is usually in one-way contact with the support surface on the brake disc on the caliper body. The arc-shaped connection reinforcement also helps to make the contact surface between the brake pad and the support surface more uniform, reducing the pressure effect per unit area of ​​the support surface. At the same time, the natural frequency of the fixed caliper assembly is also reduced, and the excitation power of low-frequency noise is reduced, so as to reduce the occurrence rate of low-frequency noise without affecting the performance of the caliper.

[0028] Through the actual brake noise bench test of a certain project and the Huangshan Road test of the actual vehicle, it was verified that no low-frequency noise of 2.8kHz occurred. Combined with the actual NVH measurement results of fixed clamps with similar structures of other mass-produced projects, the low-frequency noise can be effectively controlled, proving that the improvement of low-frequency noise of 1.25-4kHz is effective and meets expectations.

[0029] Specifically, the noise reduction baffle 6 is an arc-shaped sheet structure, and the noise reduction baffle 6 and the outer clamp body 2 are an integrally formed structure.

[0030] In this solution, the outer caliper body 2 includes a base 10, a mounting seat 11 protruding from the outer side of the base 10, connecting parts 12 formed at both ends of the inner side of the base 10, the caliper back opening 4 and the jaw 3 are formed between the connecting parts 12, the limit stopper is a part of the base 10 and is located on the outer side of the mounting seat 11, the disc side of the base 10 is an arc-shaped structure, and the disc side of the connecting part 12 has the same arc as the disc side of the base 10. This structural design makes the overall mass distribution of the brake pad more balanced and can better ensure the strength of the product at all locations. Obviously, there is no counterweight at the end of the caliper brake pad of this structural design.

[0031] The inner caliper body 1 and the outer caliper body 2 are of split design, and the connecting holes 14 of the inner caliper body 1 and the outer caliper body 2 are arranged on the caliper bodies on both sides of the caliper back opening 4, wherein the connecting holes 14 on the outer caliper body 2 are blind holes, and the connecting holes 14 on the inner caliper body 1 are through holes, and the through holes and the blind holes are fixed by bolt connection. The disc center side is the side close to the center of the brake disc, and the disc edge side is the side close to the edge of the brake disc.

[0032] Compared with traditional calipers, the fixed brake caliper designed in this scheme changes the natural frequency of the fixed caliper by adjusting the shape of the caliper body on the outside of the fixed caliper without adding mass blocks, thereby preventing frequency coupling between components under complex modal conditions and effectively reducing the occurrence rate of low-frequency noise of the fixed caliper. The four mass blocks on each caliper are cancelled. Although the weight and cost of the outer caliper increase after adjustment, the cost is still saved compared to 4 mass blocks. The weight of the outer caliper of the new structure increases by 0.22kg, which is about 7.7 yuan at 35 yuan / kg; the mass block is estimated at 4.0 yuan / piece*4, totaling 16 yuan; the estimated cost is reduced by 10.6 yuan / piece, and the product cost performance is effectively improved, and the market competitiveness is stronger.

[0033] Through the test and comparison of the natural frequency of the fixed clamp assembly, the natural frequency value dropped from about 2770Hz before adjustment to about 2680Hz after adjustment. The inertial bench NVH test was carried out simultaneously, and the 2.8kHz noise incidence rate dropped from 0.6% to 0.2%. The test data showed that after the outer clamp shape was adjusted and without the use of a mass block, there was a significant improvement in reducing the low-frequency noise of the fixed clamp.

[0034] Example 2

[0035] The difference between this embodiment and the first embodiment is that it further includes a return spring 15 , and the two ends of the return spring 15 are supported on the inner brake block 7 and the outer brake block 8 respectively.

[0036] Example 3

[0037] The difference between this embodiment and embodiment 1 is that: the base 10 is provided with a reinforcing rib 13 on one side edge close to the center of the disk, the reinforcing rib 13 and the mounting seat 11 are integrally formed, and the reinforcing rib 13 is an arched structure with a high middle part and low sides; the radial ends of the mounting seat 11 are connected to the base 10 through an arc-shaped inclined transition.

Claims

1. A fixed brake caliper without low-frequency noise, characterized in that: The invention comprises a caliper body, which is composed of an inner caliper body (1) and an outer caliper body (2), wherein a caliper opening (3) is formed on the side of the caliper body close to the brake disc, and a caliper back is formed on the side away from the brake disc, and a caliper back opening (4) is formed on the caliper back; and also comprises an inner brake block (7) and an outer brake block (8); A guide rod (5) is installed in the caliper back opening (4), and the guide rod (5) is arranged along the axial direction. The inner brake block (7) and the outer brake block (8) are sleeved on the guide rod (5) and are located at both ends of the guide rod (5); the outer brake block (8) is formed with an arc-shaped noise reduction baffle (6) on the outer edge of the caliper back opening (4), and the outer brake block (8) is located on the inner side of the noise reduction baffle (6).

2. A fixed brake caliper without low-frequency noise according to claim 1, characterized in that: The side surfaces of the pliers body on the left and right sides of the pliers back opening (4) are arc-shaped surfaces (9), the edge of the noise reduction baffle (6) is arc-shaped, and the arc and the side surfaces of the pliers body are located on an arc line.

3. A fixed brake caliper without low-frequency noise according to claim 2, characterized in that: The noise reduction baffle (6) is an arc-shaped sheet structure, and the noise reduction baffle (6) and the outer clamp body (2) are an integrally formed structure.

4. A fixed brake caliper without low-frequency noise according to claim 3, characterized in that: The outer pliers body (2) comprises a base (10), a mounting seat (11) protruding from the outer side of the base (10), connecting parts (12) formed at both ends of the inner side of the base (10), a pliers back opening (4) and a pliers opening (3) formed between the connecting parts (12), a limit stopper being a part of the base (10) and being located on the outer side of the mounting seat (11), the disk side of the base (10) being an arc-shaped structure, and the disk side of the connecting part (12) having the same curvature as the disk side of the base (10).

5. A fixed brake caliper without low-frequency noise according to claim 4, characterized in that: The base (10) is provided with a reinforcing rib (13) at one side edge close to the center of the disk. The reinforcing rib (13) and the mounting seat (11) are integrally formed. The reinforcing rib (13) is an arched structure with a high middle portion and low sides. The radial ends of the mounting seat (11) are connected to the base (10) via an arc-shaped inclined transition.

6. The fixed brake caliper without low-frequency noise according to claim 1, characterized in that: No counterweight is provided at the end of the brake shoe.

7. A fixed brake caliper without low-frequency noise according to claim 2, characterized in that: The inner jaw body (1) and the outer jaw body (2) are of split design. The connecting holes (14) of the inner jaw body (1) and the outer jaw body (2) are arranged on the jaw bodies at both sides of the jaw back opening (4). The connecting holes (14) on the outer jaw body (2) are blind holes, and the connecting holes (14) on the inner jaw body (1) are through holes. The through holes and the blind holes are connected and fixed by bolts.

8. The fixed brake caliper without low-frequency noise according to claim 2, characterized in that: It also comprises a return spring (15), the two ends of which are respectively supported on the inner brake block (7) and the outer brake block (8).

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