KR200281974Y1 - Cover shim of disc brake - Google Patents

Abstract

The present invention relates to a cover shim of a disc brake, and an object thereof is to reduce the overall manufacturing cost of the disc brake by constructing a pad wear detection unit integrally with a cover shim provided between the pad plate and the piston end surface.

Cover core 800 of the disc brake according to the present invention is made of a steel plate and is installed to cover the outer surface portion of the inner pad plate 500 in contact with the front end surface of the piston 200 braking friction heat to the piston 200 side The pad wear detection unit 820 is formed at one side of the cover shim 800 so as to be bent and extended toward the disk 700. Contact metal sounds were generated.

Therefore, when the pad 510 is over-weared by the continuous braking action, the pad wear detection unit 820 recognizes an exchange time thereof. This is a cover shim that prevents braking frictional heat and vibration from being directly transmitted to the piston 200. Since it is integrally formed at 800, the assembly parts are improved due to the reduction of the total number of parts of the disc brake, and the manufacturing cost is reduced.

Description

Cover shim of disc brake

The present invention relates to a disc brake, and more particularly, to a cover shim provided to surround the outer surface of the inner pad plate to prevent braking friction heat from being transferred to the piston side.

In general, a brake mounted on a vehicle is a device for decelerating, stopping or maintaining a vehicle while driving, and converts kinetic energy during driving into thermal energy by a mechanical friction device to release its frictional heat into the air to brake. Drum type hydraulic brakes and disc type hydraulic brakes.

Disc brake is to obtain a braking force by pressing the disk-shaped disk that rotates with the wheel instead of the drum with a pad on both sides. 1 is a plan sectional view showing the overall structure of such a disc brake.

As shown in the related art, the disc brake is divided into a housing 10 in which the piston 20 is installed and a carrier 40 fixed to the vehicle body and in which pad plates 50 and 60 are installed. The housing 10 has a cylinder 11 formed therein, and the piston 20 is configured to move back and forth by the braking hydraulic pressure transmitted through the inlet 12. In addition, fastening holes 13 are formed at both ends of the housing 10, respectively, for fastening with the carrier 40.

The carrier 40 is provided with a pair of pad plates 50 and 60 to which the pads 51 and 61 are attached. The pad plates 50 and 60 are spaced apart by a predetermined interval so as to move forward and backward within the carrier 40, which is an outer pad plate 50 to which the inner pad 51 is attached and an outer pad 61 to which the outer pad 61 is attached. The pad plate 60 is formed. The outer surface of the inner pad plate 50 is configured to be in contact with the piston 20 moving forward and backward, and the outer surface of the outer pad plate 60 is in contact with the finger portion 15 extending from the housing 10. It is installed to move forward when braking. Between the pair of pads 51 and 61, a disk-like disk 70 is inserted which is inserted into a part of its outer circumference and rotates together with a wheel (not shown) with a predetermined gap therebetween. In addition, a soft boot 16 for preventing foreign matter from entering the inlet of the cylinder 11 is installed, and a cover shim 80 made of steel sheet is provided to surround the outer surface of the inner pad plate 50. have. Therefore, the braking frictional heat and vibration generated by the friction action between the disk 70 and the pad 51 are prevented from being directly transmitted to the piston 20, thereby preventing the boot 16 from being burned out by heat and reducing the braking noise. .

And the housing 10, the piston 20 is installed, and the carrier plate 40, the pad plate (50, 60) is installed is slidably coupled, these coupling structures are as follows. First, fastening holes 13 are formed at both ends of the housing 10, as described above, and fastening grooves 41 having a predetermined depth are formed at both ends of the carrier 40 so as to face the fastening holes 13. have. Accordingly, one end of the guide rod 30 is fixedly fastened to the fastening hole 13 using the bolt 14, and the other end thereof is inserted into the fastening groove 41 so as to be freely inserted therein, thereby fixing the carrier 40 to the vehicle body. The housing 10 is coupled to. Reference numeral 21 is a seal for restoring the piston 20 when the hydraulic pressure is released to the cylinder 11.

When driving a vehicle having a general disc brake configured as described above, when a driver presses a brake pedal (not shown), a braking hydraulic pressure is generated from a master cylinder, which is not shown, and the braking hydraulic pressure is continuously applied to the cylinder 11 through the inlet 12. Is passed into). Therefore, by advancing the piston 20 by braking hydraulic pressure, the inner pad 51 attached to the inner pad plate 50 is momentarily compressed to the side surface of the disk 70 that rotates together with a wheel (not shown). In addition, since the hydraulic pressure is present in the cylinder 11, the housing 10 itself slidably fastened to the carrier 40 through the guide rod 30 moves in the opposite direction, whereby the finger 15 is disposed on the outer pad. The plate 60 is pushed, and the outer pad 61 attached to the outer pad plate 60 is pressed to the side surface of the disk 70 to brake.

At this time, a significant braking frictional heat is generated during the braking operation, which is prevented from being directly transmitted to the piston 20 side by the cover shim 80 on the steel plate installed to surround the pad plate 50 as described above. Of course, the burnout is prevented and the overall braking noise is reduced. When the brake pedal (not shown) is released, the piston 20 is restored to its original position due to the elastic restoring force of the seal 21, and the disks 70 and the pads 51 and 61 are spaced apart from each other at regular intervals.

On the other hand, if such a braking action is repeated, the pads 51 and 61 are continuously worn out due to friction with the disk 70, and the brake performance is deteriorated. Accordingly, in order to let the driver know when to replace the pad plates 50 and 60 with the pads 51 and 61 attached thereto, the pad plate 50 is in contact with the side of the disk 70 as shown in FIG. 2. A pad wear detecting member 90 for generating metal sounds was provided.

That is, as shown here, a plate-shaped pad wear detection member 90 made of a metal material is provided to be spaced apart from the disk 70 at an end portion of the pad plate 50, which is a pad plate 50. One end is fixed by the rivet 91 and the other end is bent and extended so as to face the side of the disk 70 at a predetermined interval.

Therefore, when the disc brake is used for a long time, the pad 51 holding the disc 70 on both sides will gradually wear out, and the other end of the pad wear detecting member 90 during braking action when the pad 51 is over worn. Is in contact with the side of the disk 70. At this time, a metal friction sound is generated due to the contact between the disk 70 and the pad wear detection member 80, which rotate together with the wheel (not shown), and the driver hears the friction sound and the pad 51 is attached. The exchange of the pad plate 50 is recognized.

However, such a conventional disc brake, as described above, the pad wear sensing member made of a steel material for detecting excessive wear of the cover shim 80 and the pad 51 to prevent braking frictional heat and vibration transmission on the outer surface of the pad plate 50. Since 90 is fixed separately through the rivet 91, as well as the assembly productivity thereof is lowered, there is a problem that the manufacturing cost increases due to the increase in the number of parts.

The present invention is to solve this problem, the object of the present invention is made of steel plate cover is installed to cover the outer surface portion of the inner pad plate in contact with the front end surface of the piston to prevent the braking frictional heat transfer to the piston side The core is provided, and the pad wear detection unit is integrally formed so that the tip portion is bent and extended toward the disc side, so that the replacement time of the pad due to excessive wear can be easily recognized, thereby reducing the total number of parts of the disc brake and reducing the manufacturing cost. It is to provide a cover seam of the disc brake to save.

1 is a plan sectional view showing the overall structure of a conventional disc brake.

2 is a schematic view showing an installation structure of a conventional pad wear detection sensor.

3 is a plan sectional view schematically showing the overall structure of a disc brake according to the present invention.

4 is a perspective view showing an extract of the structure of the cover shim provided with a pad wear detection unit according to the present invention.

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

100. Housing 200. Piston 400 Carrier

Inner pad plate 500 Inner pad 600 Outer pad plate

610 outer pad 700 disc 800 cover shim

810. Joining piece 820. Pad wear detection unit

The present invention for achieving this purpose, the disk on the disk rotates with the wheel, the piston moving forward and backward by the braking hydraulic pressure, the front end face of the piston is provided on the center of the braking action by friction with the side of the disk when the piston advances In the pad brake with a pad, the disc brake having a cover core made of a steel plate is coupled to surround the outer surface of the pad plate in contact with the piston to prevent the transfer of braking friction heat directly to the piston side,

The cover shim is characterized in that the tip end portion is bent toward the disk side, and the pad wear detection unit for generating metal sounds in contact with the disk when the pad is over-weared is integrally provided.

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

Figure 3 is a plan sectional view showing the overall structure of the disc brake according to the present invention, Figure 4 is a perspective view schematically showing the fastening structure of the cover shim integrally formed pad wear detection unit according to the present invention.

Disc brake according to the present invention, as shown in these, the piston 200 which moves forward and backward by hydraulic pressure is installed in the cylinder 110 of the housing 100 forming the outer body, the central portion of the carrier 400 A pair of pad plates 500 and 600 to which the pads 510 and 610 are attached are configured. Both ends of the housing 100 are formed with a fastening hole 130 to which the guide rod 300 to be described later is fastened to the bolt 140, and reference numeral 210 is a seal for restoring the piston 200.

Fastening grooves 410 are formed at both ends of the carrier 400 fixed to the vehicle body, and the guide rod 300 fastened to the fastening hole 130 by the bolt 140 is fitted therein so as to be freely coupled to the housing 100. Both ends are slidably fastened. The carrier 400 is provided with pad plates 500 and 600 having pads 510 and 610 respectively attached to one surface thereof, which is an outer pad plate 500 having an inner pad 510 and an outer pad 610 attached thereto. The pad plate 600 is distinguished. The inner pad plate 500 is advanced inward due to the forward movement of the piston 200, and the outer pad plate 600 is advanced inward by the finger part 150 of the housing 100. In addition, a portion of the disc-shaped disc 700 that rotates together with the wheel (not shown) of the vehicle is inserted and rotated between the inner pad 510 and the outer pad 610.

On the other hand, the outer surface of the inner pad plate 500 in contact with the front end surface of the piston 200 is fixed to the cover core 800 on the steel plate to cover it so as to be fixed through the bent coupling piece 810, the pad 510 The braking frictional heat and vibration with the disk 700 are not directly transmitted to the piston 200 by the cover shim 800. Accordingly, damage to the boot 160 installed at the inlet of the cylinder 110 is prevented and braking noise is reduced.

In addition, the cover shim 800 is integrally formed with the pad wear detection unit 820 for notifying the driver of the replacement time of the pads 510 and 610 that are damaged due to continuous braking action as a characteristic element of the present invention. The pad wear detection unit 820 extends from one side of the cover shim 800 on the steel plate to the pad plate 500 to be bent toward the disk 700 side, and is formed to be spaced at a predetermined interval in an initial state. Therefore, when the pad 510 is over-weared, the front end of the pad wear detection unit 820 and the side of the disk 700 are rubbed, and thus the replacement time of the pad 510 can be known, which will be described in detail in the operation description.

Next, the operation of the disc brake according to the present invention configured as described above will be described. When the driver steps on the brake pedal (not shown) when the vehicle moves forward, the braking hydraulic pressure is transmitted from the master cylinder (not shown) into the cylinder 110 through the inlet port 120 so that the piston 200 moves forward. Accordingly, the inner pad plate 500 installed in the carrier 400 so as to move forward and backward is moved forward, and the inner pad 510 attached thereto is friction with the side of the disk 700 that rotates together with the wheel to perform a braking action. Done. At the same time, the outer pad 610 of the outer plate 600 is the disk 700 by the finger portion 150 by sliding the housing 100 in the opposite direction of the piston 200 advance by the hydraulic pressure remaining in the cylinder 110. ) And friction braking.

When the driver releases the brake pedal and the brake hydraulic pressure is released, the piston 200 is restored to its original position by the restoring force of the seal 210, and the inner pad 510 and the outer pad 610 rotate at high speed. Again with friction).

At this time, the pad plates 500 and 600 to which the pads 510 and 610 are attached are shaken, and most of the vibrations are attenuated by the cover shim 800 to prevent transfer to the piston 200 embedded in the cylinder 110. Therefore, the overall operating noise due to the braking action is reduced.

On the other hand, when the disk brake is used for a long time, the pads 510 and 610 are gradually worn out by repeated friction with the disk 700 which rotates together with the wheels, so that the gap between the front end of the pad wear detection unit 820 and the side of the disk 700 gradually increases. Will be narrowed. Therefore, when the pad 510 is over-weared, when the braking action is performed, the tip portion of the pad wear detection unit 820 comes into contact with the side of the disk 700 that rotates at high speed, and a metal friction sound is generated by the driver. It is possible to recognize the replacement time of the pad plate 500 is attached to prevent a safety accident due to the braking force is reduced.

Since the pad wear detection unit 820 having such a function is integrally formed on the cover shim 800 to prevent braking frictional heat and vibration transmission as a characteristic element of the present invention, the number of parts of the overall disc brake is reduced and its assembly production. This is facilitated.

As described in detail above, the cover core of the disc brake according to the present invention is made of a steel plate and is installed to cover the outer surface portion of the inner pad plate in contact with the front end surface of the piston to prevent the braking friction heat from being transferred to the piston side. The pad wear detection part was formed at one side of the cover shim so that the tip part was bent toward the disk side so as to generate the metal side contact with the disc side part when the pad was worn.

Therefore, when the pad is over-weared by continuous braking action, the pad wear detection unit recognizes the timing of its replacement, which is integrally formed on the cover shim to prevent the braking frictional heat and vibration from being transmitted directly to the piston side. Due to the reduction in the overall number of parts, as well as their assembly productivity is improved, there is an advantage that the manufacturing cost is reduced.

Claims (1)

The disk 700 that rotates with the wheel, the piston 200 to move forward and backward by braking hydraulic pressure, the front end surface of the piston 200 is provided on the center contact the disk 700 when the piston 200 is advancing A pad plate 500 having a pad 510 frictional with a side portion of the pad) is attached to the pad plate 500, and a padding frictional heat is combined to surround an outer surface of the pad plate 500 contacting the piston 200. In the disk brake having a cover shim 800 made of a steel sheet to prevent the direct transmission to the side), In the cover shim 800, a tip wear portion is bent toward the disk 700 side, and the pad wear detection unit 820 which generates metal sounds by contacting the disk 700 when the pad 510 is over worn. The cover shim of the disc brake is provided integrally.