KR100843108B1 - A pad spring of disc brake and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a pad spring for a disc brake and a method for manufacturing the same, and an object of the present invention is to improve the function of smoothly guiding the pad plate sliding operation and reducing the vibration applied to the carrier from the pad plate. The present invention provides a pad spring for a disc brake and a method of manufacturing the same, which are provided to maintain an improved function for a long time.

To this end, the present invention slidably accommodates a pair of pad plates on which the friction pads are attached to inner surfaces opposed to each other in order to pressurize and fix both sides of the disk rotated with the wheel to the disk inside the carrier fixed to the vehicle body. The pad spring is interposed between the pad plate and the carrier to prevent the vibration applied to the pad plate from being transmitted to the carrier while guiding the sliding operation of the pad plate, wherein the pad spring is the pad plate. The low friction material is coated on one surface which is in contact with the contact surface and the elastic body is coated on the other surface which is in contact with the carrier.

Description

Pad spring for disc brake and manufacturing method thereof {A PAD SPRING OF DISC BRAKE AND MANUFACTURING METHOD THEREOF}

1 is an exploded perspective view showing the structure of a disc brake according to the present invention.

2 is a cross-sectional view showing the main structure of the disc brake according to the present invention.

3 is an enlarged cross-sectional view illustrating a cross-sectional structure of a pad spring in the disc brake according to the present invention.

4 is a flowchart sequentially illustrating a manufacturing process of the pad spring according to the first embodiment of the present invention.

5 is a flowchart sequentially illustrating a manufacturing process of the pad spring according to the second embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: Caliper Housing 11: Piston

20: carrier 21, 22: friction pad

23, 24: pad spring 30: disk

40: pad spring 41: first support portion

42: second support portion 43: connection portion

50: low friction material 60: elastomer

The present invention relates to a disc brake, and more particularly, to a pad spring provided to guide the sliding operation of the pad plate and to reduce the vibration applied to the pad plate, and a manufacturing method thereof.

In general, a disc brake is a device for braking and decelerating a vehicle through such a friction force by forcing a friction pad to closely adhere to both sides of the disc rotated together with the wheel of the vehicle.

The disc brake includes a caliper housing provided with a piston for receiving and receiving braking hydraulic pressure, a carrier fixed to itself so that a pair of pad plates attached to inner surfaces of the friction pads are installed, and a wheel, And a disk which rotates together and is provided with a portion of an outer circumference inserted between the pair of pad plates.

The piston is disposed in the rear portion of the caliper housing to push the outer surface of one pad plate toward the disc, the finger portion is formed in the front portion of the caliper housing opposite the piston to surround the outer surface of the other pad plate.

Therefore, when the piston is operated so that one pad plate presses one side of the disk, the other pad plate is attracted to the finger to press the other side of the disk so that the disk can be pressed between the pair of friction pads. do.

On the other hand, the carrier is mounted on its own knuckle through a bolt so that each pad plate is slidably installed therein. The pad plate and the carrier are guided by the sliding operation of the pad plate to suppress the shaking of the pad plate. A pad spring is provided, and the pad spring is usually formed by press-forming a metal plate made of stainless steel or spring steel and then bending.

However, such a conventional disc brake generates a large noise due to friction in the process of directly contacting the pad plate and the pad spring, each of which is made of a metal material during the sliding operation of the pad plate for pressing the disk, or smooth sliding of the pad plate. There was a problem that the operation is disturbed.

Therefore, recently, in order to solve this problem, grease (grease) is applied to the friction surface between the pad plate and the pad spring, so that the sliding motion of the pad plate is smoothly performed, and the friction noise of the pad plate and the pad spring is reduced. Grease has a characteristic of gelling over a certain time, which is not only hassle to replenish frequently, but also performs inherent lubrication when the wear dust generated when friction between the disc and the friction pad sticks. There was a problem that could not be done.

In addition, the pad spring is elastically supported between the pad plate and the carrier to absorb the vibration generated when the pad plate is shaken in a direction perpendicular to the sliding direction during the sliding operation of the pad plate, which is transmitted to the carrier. Due to the nature of the silver material, the damping function was also degraded as the elastic deformation and restoring ability decreased over time.

SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and an object of the present invention is to improve the function of smoothly guiding the pad plate sliding operation and the function of reducing vibration applied to the carrier from the pad plate at the same time, while the improved function It is to provide a pad spring for the disc brake and a method of manufacturing the same that are provided to be maintained continuously.

In order to achieve the above object, the present invention provides a pair of pad plates on which the friction pads are attached to inner surfaces facing each other to press and fix both sides of the disk rotated together with the wheels. In the disc brake is slidably accommodated, the pad spring is interposed between the pad plate and the carrier to guide the sliding movement of the pad plate to suppress the vibration applied to the pad plate toward the carrier. The low friction material is coated on one surface in contact with the pad plate, and the elastic body is coated on the other surface in contact with the carrier.

And the low friction material is characterized in that it comprises Teflon.

In addition, the low friction material is characterized in that a thin coating on the outer surface of the pad spring to have a thickness in the range of 15-25㎛.

In addition, the elastic body is characterized in that it comprises a heat-resistant reinforced rubber. In addition, the elastic body is characterized in that it comprises a synthetic resin containing a heat-resistant reinforced rubber and urethane, carbon black, a vulcanization accelerator, a furnace agent, and a fluoropolymer.

In addition, the elastic body is characterized in that a thin coating on the outer surface of the pad spring to have a thickness in the range of 25-35㎛.

In addition, a method of manufacturing a pad spring for a disc brake according to the present invention includes a coating preparation step of sanding or corrosion treatment of both surfaces of a metal plate for forming a pad spring, and a low friction material on one surface of the metal plate material subjected to the coating preparation step. The coating step of coating and the other surface is coated with an elastic body, and pressing and bending the metal plate material subjected to the coating step to form a shape of the pad spring processing step, and the band spring of the pad spring in the shape processing step It characterized in that it comprises a stress relief heat treatment step of removing the stress applied to the site.

In addition, the method for manufacturing a pad spring for a disc brake according to the present invention comprises a shape processing step of pressing and bending a metal plate to form the pad spring, and sanding both surfaces of the pad spring through the shape processing step. A coating preparation step for corrosion treatment, a coating step of coating a low friction material on one surface of the pad spring after the coating preparation step and an elastic body on the other surface, and the stress applied to the banding portion of the pad spring in the shape processing step It characterized in that it comprises a stress relief heat treatment step of performing a heat treatment to the pad spring subjected to the coating step to remove.

Next, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Disc brake according to the present invention, as shown in Figure 1, the caliper housing 10 and the friction pads (21, 22) and the friction pads (21, 22) is provided so that the piston (11) to receive the braking hydraulic pressure is built in A part of the outer periphery between the carrier 20 fixed to the vehicle body so that a pair of pad plates 23 and 24 attached to the inner surface thereof are installed, and the pair of pad plates 23 and 24 rotating together with the wheels. It is configured to include a disk 30 is provided to be inserted.

The piston 11 is disposed at the rear of the caliper housing 10 so as to push the outer surface of one side of the pad plate 24 toward the disk 30, the other side in the front of the caliper housing 10 opposite the piston 11 A finger portion 10a is formed to surround the outer surface of the pad plate 23, and the caliper housing 10 is slidably coupled to the carrier 20. For reference, reference numeral 10b is a cylinder for accommodating the piston 11.

Therefore, when the piston 11 is operated so that one pad plate 24 presses one surface of the disk 30, the other pad plate 23 is attracted to the finger portion 10a to press the other surface of the disk 30. As a result, the disk 30 can be pressed between the pair of friction pads 21 and 22.

In addition, the carrier 20 is fixed to its own knuckle through bolts, and the pad plates 23 and 24 are slidably installed therein, and between the pad plates 23 and 24 and the carrier 20. The pad springs (40) for suppressing the shaking of the pad plates (23, 24) are provided while guiding the sliding operation of the pad plates (23, 24).

In more detail, both sides of the carrier 20 and both ends of the pad plates 23 and 24 corresponding to the carrier 20 have a concave-convex structure corresponding to each other, and each of the pad springs 40 is formed on one side of the pad plate 23. The first support part 41 supporting the end, the second support part 42 supporting the end of the other pad plate 24, and the upper part of the first support part 41 and the second support part 42 are integrally connected. And a connecting portion 43, wherein the first and second supporting portions 41 and 42, which are substantially supported between the pad plates 23 and 24 and the carrier, have the shape of the ends of the pad plates 23 and 24. It is formed to be bent to have a concave-convex structure corresponding to the.

 On the other hand, in the present invention, as shown in Figure 2 and 3, the pad spring 40, the low friction material 50 is coated on one surface in contact with the pad plates (23, 24) and the carrier 20 and The elastic body 60 is coated on the other surface to be in contact with the carrier 20 from the pad springs 23 and 24 and the function of the pad springs 40 to smoothly guide the sliding operation of the pad plates 23 and 24. In order to simultaneously improve the function of the pad spring 40 to reduce the vibration applied to the friction reducing function and the buffer function of the improved pad spring 40 is to be maintained for a long time.

That is, when the pad plates 23 and 24 and the pad springs 40, which are made of a metal material, come into direct contact with each other during the sliding operation of the pad plates 23 and 24 for pressurizing the disk 30, The friction between the two members may cause a loud noise, and thus the smooth sliding operation of the pad plates 23 and 24 may be disturbed. Like the pad springs 40 according to the present embodiment, the pad plates 23 and 24 and the pad plates 23 and 24 may be disturbed. In the state where the low friction material 50 is coated on one surface of the pad spring 40 to be in contact, the sliding action of the pad plates 23 and 24 is reduced while the contact friction between the pad plates 23 and 24 and the pad spring 40 is reduced. It can be performed more smoothly.

In addition, the low friction material 50 does not need to be replaced even if it is used for more than a predetermined time, and even if the wear dust generated when the friction between the disk 30 and the friction pads 21 and 22 sticks to the vehicle, Since it is naturally removed through the wind generated during the operation of the smooth and the sliding operation of the pad plates (23, 24) can be maintained for a longer period of time.

In addition, the pad spring 40 is provided to elastically support the pad plates 23 and 24 and the carrier 20 so that the pad plates 23 and 24 are perpendicular to the sliding direction during the sliding operation of the pad plates 23 and 24. Vibration generated while shaking in the direction is absorbed to be transmitted to the vehicle body through the carrier 20, the pad spring 40 is such that as the elastic deformation and restoring ability is reduced over time due to the characteristics of stainless steel or spring steel The damping function may be degraded. However, as described above, in the state in which the elastic body 60 is coated on the other surface of the pad spring 40 on the carrier 20 side, the elastic force of the pad spring 40 is doubled through the elastic force of the elastic body 60, thereby providing a pad spring ( Even when the damping function of 40 is improved, and the spring of the pad spring 40 is used for a long time, and the elastic force of the pad spring 40 itself is reduced, the pad spring 40 is formed by the elastic force of the elastic body 60. The damping action can be carried out continuously.

The low friction material 50 or the elastic body 60 may be locally coated only on a part of the pad spring 40, and as shown in the drawing, the low friction material 50 or the elastic body 60 may be uniformly coated on both sides of the pad spring 40. It may be.

Next, the manufacturing process of the pad spring 40 according to the present invention configured as described above will be described.

Pad spring 40 according to the present invention is a coating preparation step 100, coating step 200-shape processing step 300-stress relief heat treatment step 400 according to the first embodiment shown in FIG. Can be produced sequentially.

The coating preparation step 100 of the first coating the low friction material 50 or the elastic body 60 by sanding or corrosion treatment of both sides of the metal plate of stainless steel or spring steel material to form the pad spring 40 first In order to facilitate this, in the coating step 200, the low friction material 50 and the elastic body 60 are coated on both surfaces of the metal plate material which is sanded or corroded in this manner.

In this case, Teflon is employed as the low friction material 50 so as to withstand high heat in the stress relief heat treatment step 400 which will be described later, and the elastic body 60 is configured to include heat-resistant reinforced rubber and urethane, etc. In step 200, the low friction material 50 and the elastic body 60 is thinly coated on the surface of the metal plate material to prevent excessive increase in the thickness of the thin metal plate material. The low friction material 50 is preferably formed to have a thickness in the range of 15-25㎛, in the case of the elastic body 60 is preferably formed to have a thickness in the range of 25-35㎛, wherein the metal plate material Maintain thickness of 0.3-0.5mm.

In addition, in the case of Teflon used as the low friction material 50, it is preferable to be sprayed and coated on the surface of the metal plate material, but alternatively, the coating may be performed by electrostatic coating or general coating. In addition, the elastic body 60 is provided through a mixture in which a predetermined amount of carbon black, a vulcanization accelerator, a lubricating agent, and a fluorine polymer are added to a synthetic resin including heat resistant rubber and urethane. 60 may be coated by various methods such as spray spraying method or roller coating method as much as being coated on the surface of the metal plate of the plate.

Wherein the carbon black to improve the heat resistance of the elastic body 60 together with the heat-resistant reinforced rubber and urethane, the vulcanization accelerator and the furnace agent inhibits the oxidation of the elastic body 60 while improving the elastic force of the heat-resistant reinforced rubber, The fluoropolymer will play a role in promoting the reaction between them.

In addition, the metal plate, which has undergone the coating step 200, has the shape of the pad spring 40 through pressing and bending in the shape processing step 300. The first and second support parts 41 may be used during the bending process. Since the stress is concentrated in the bending portion as shown in (42), the pad spring 40 which has undergone the shape processing step 300 is subjected to a shape processing step through an annealing heat treatment process at a temperature of 350-370 ° C. in the stress relief heat treatment step. The stress applied at 300 is removed, thereby completing the manufacture of the pad spring 40. Accordingly, in the manufacturing process of the pad spring 40 according to the first embodiment, the low friction material 50 or the elastic body 60 is coated on the outer surface of the metal sheet material before the shape of the pad spring 40 is processed. The low friction material 50 and the elastic body 60 can be evenly coated to every corner of the surface of the pad spring 40 naturally.

In addition, unlike the first embodiment described above, the pad spring 40 according to the present invention has a shape processing step 500-a coating preparation step 600-a coating step 700-according to the second embodiment shown in FIG. The stress relief heat treatment step 800 may be manufactured sequentially.

First, the shape processing step 500 forms a shape of the pad spring 40 by pressing and bending a metal plate material of stainless steel or spring steel, and in the following coating preparation step 600, the pad spring 40. Sanding or corrosion treatment of both sides of the low friction material 50 or the coating of the elastic body 60 to be smooth, in the coating step 700 of the sanding or corrosion treatment of the pad spring 40 as described above The low friction material 50 and the elastic body 60 are respectively coated on both sides.

In addition, in the coating step 700, Teflon is employed as the low friction material 50 so as to withstand high heat in the stress removing heat treatment step 800 which will be described later, and the elastic body 60 includes heat-resistant reinforced rubber and urethane. In the coating step 700, the low friction material 50 and the elastic body 60 are thinly coated on the surface of the pad spring 40 to prevent the thickness of the thin pad spring 40 from being excessively increased. do. In the case of the low friction material 50 is preferably coated to have a thickness in the range of 15-25㎛, in the case of the elastic body 60 is preferably coated to have a thickness in the range of 25-35㎛, wherein the pad spring 40 maintains a thickness of about 0.3-0.5mm.

In addition, in the case of Teflon used as the low friction material 50, it is preferable to be sprayed and coated on the surface of the pad spring 40, the coating is also possible in the electrostatic coating or general coating method. In addition, the elastic body 60 is provided through a mixture in which a predetermined amount of carbon black, a vulcanization accelerator, a lubricating agent, and a fluorine polymer are added to a synthetic resin including heat resistant rubber and urethane. 60 is coated on the surface of the pad spring 40 through a spray injection method.

In the coating step 700, before the elastic body 60 is coated on the outer surface of the pad spring 40, it is preferable to preheat the outer surface of the pad spring 40 to be coated with the elastic body 60, which is the elastic body. 60 is to be more smoothly coated on the surface of the pad spring 40 has already bent while going through the bending process of the shape processing step 500.

In addition, the carbon black together with the heat-resistant rubber and urethane to enhance the heat resistance of the elastic body 60, the vulcanization accelerator and the furnace agent to suppress the oxidation of the elastic body 60 while improving the elastic force of the heat-resistant reinforced rubber, The fluoropolymer will play a role of promoting the reaction between them.

In this state, the pad spring 40 has a stress concentrated on bending areas such as the first and second support parts 41 and 42 during the bending of the shape processing step 500. The coarse pad spring 40 is subjected to an annealing heat treatment process at a temperature of 350-370 ° C. in the stress removing heat treatment step 800 to remove the stress applied in the shape processing step 500, and accordingly to the second embodiment. The manufacture of the pad spring 40 is completed. Therefore, in this case, the stress applied to the pad spring 40 in the shape processing step 500 is removed in the stress relief heat treatment step 800 performed after the coating step 700, but the coating of the pad spring 40 in the coating step 700 The low friction material 50 or the elastic body 60 that is thinly coated to be coated on the surface is not significantly affected by the high heat in the stress relief heat treatment step 800.

As described above in detail, the disk brake pad spring according to the present invention is provided with a low friction material is coated on one surface in contact with the pad plate and the elastic body is coated on the other surface in contact with the carrier. Therefore, the pad spring for the disc brake according to the present invention is improved at the same time to smoothly guide the pad plate sliding operation and to reduce the vibration applied to the carrier from the pad plate, thus improving the friction reduction function and the buffer function You will be able to keep it for the long term.

Claims (10)

A pair of pad plates, each of which has a friction pad attached to mutually opposed inner surfaces for pressing and fixing both sides of the disk rotated with the wheel, is slidably received toward the disk in a carrier fixed to the vehicle body, and the pad plate In the disk brake interposed between the pad and the carrier to guide the sliding movement of the pad plate while suppressing the vibration applied to the pad plate toward the carrier, The pad spring is coated with a low friction material on one surface in contact with the pad plate and the elastic body is coated on the other surface in contact with the carrier, The low friction material includes a teflon and is thinly coated on the outer surface of the pad spring to have a thickness in the range of 15-25㎛, The elastic body includes a synthetic resin comprising heat-resistant reinforcement rubber and urethane, carbon black, vulcanization accelerator, preservative, and fluoropolymer, and is thinly coated on the outer surface of the pad spring to have a thickness in the range of 25-35 μm. Pad spring for the disc brake, characterized in that. delete delete delete delete delete A coating preparation step of sanding or corrosion treatment of both sides of the metal plate material to form a pad spring, a coating step of coating a low friction material on one surface of the metal plate material subjected to the coating preparation step and an elastic body on the other surface; It includes a shape processing step for pressing and bending the metal plate material subjected to the coating step to form the pad spring, and a stress relief heat treatment step for removing the stress applied to the banding portion of the pad spring in the shape processing step, , The low friction material comprises teflon, the elastic body is composed of a heat-resistant reinforced rubber, the low friction material and the elastic body in the coating step to form a thickness in the range of 15-25㎛ and 25-35㎛ each, respectively A method of manufacturing a pad spring for a disc brake, characterized in that the thin coating on the outer surface of the pad spring. delete Pressing and bending a metal plate to form a shape of the pad spring, a coating preparation step for sanding or corrosion treatment of both sides of the pad spring after the shape processing step, and the coating preparation step A coating step of coating a low friction material on one surface of the pad spring and an elastic body on the other surface thereof, and a stress of performing heat treatment on the pad spring undergoing the coating step to remove the stress applied to the bending portion of the pad spring in the shape processing step. A removal heat treatment step, The low friction material comprises teflon, the elastic body is composed of a heat-resistant reinforced rubber, the low friction material and the elastic body in the coating step to form a thickness in the range of 15-25㎛ and 25-35㎛ each, respectively A method of manufacturing a pad spring for a disc brake, characterized in that the thin coating on the outer surface of the pad spring. delete

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