KR19980085277A - Sliding pin structure of disc brake - Google Patents

Abstract

The present invention relates to a sliding pin structure of a disc brake capable of minimizing wear and deformation of a sliding part due to vibration by smoothly absorbing vibration generated during sliding contact between a sliding pin and a pinhole. The caliper body includes a guide of a caliper bracket. In the sliding pin structure of the disk brake is fixed to the caliper body sliding pins slidably coupled to the pinhole of the guide portion to press each pad located at both ends of the disk while flowing along the portion, the outer peripheral surface of the sliding pin An annular assembly groove is formed, and the annular assembly groove provides a sliding pin structure of a disc brake in which a buffer bush having a diameter larger than the outer diameter of the sliding pin is installed.

Description

Sliding pin structure of disc brake

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding pin of an automobile disc brake, and more particularly, an annular assembly groove is formed on an outer circumferential surface of a sliding pin, and a cushioning bush is installed in the annular assembly groove, thereby providing a sliding pin. The present invention relates to a sliding pin structure of a disc brake capable of smoothly absorbing vibration generated between both ends of a pin hole.

In general, a vehicle is provided with a braking device that serves to slow down or stop the vehicle speed while driving.

The brake system is a booster that doubles the pedal effort by using the vacuum pressure (engine suction pressure) generated by the power of the engine, creates pressure in each brake circuit, and changes the volume of the brake oil. It consists of a master cylinder that quickly compensates for the loss of circuit pressure and a wheel cylinder that stops the rotation of the wheel by the brake oil pressure and reduces the rotation speed.

The wheel cylinder is in close contact with an inner peripheral surface of the cylindrical drum synchronously rotating with the wheel wheels to close the brake shoe installed in the inner side of the wheel brake to generate a braking force, or to close the pad to the disk-shaped disk synchronously rotating with the wheel wheel It is installed in the disc brake that generates the braking force to activate the brake.

Here, a typical example of a conventional disc brake is illustrated in FIGS. 1 and 2, which will be briefly described as follows.

As shown in the figure, the disc brake is largely installed to rotate synchronously with the wheel wheel, and the inner and outer pads 125 which are fixed to the inner knuckle arm of the wheel wheel and slide with both sides of the disk 110 interposed therebetween ( Caliper bracket 120 having a 126 and a caliper sliding through the caliper bracket 120 to bring the inner and outer pads 125 and 126 into contact with the disk 110 by the action of the piston 132 according to the hydraulic pressure. The body 130 is comprised large.

At the lower end of the caliper bracket 120, a support part 121 having a through hole 122 is formed to be fixed to the knuckle arm through a bolt, and guide parts 123 having pin holes 123a are formed at both ends of the upper part. The inside of the guide part 123 is provided with a guide bracket 124 on which the inner and outer pads 125 and 126 slide.

A cylinder 131 is formed in the center of the caliper body 130 in the sliding direction of the inner and outer pads 125 and 126, and a piston 132 is provided in the cylinder 131 to enter the cylinder 131. The inner pads 125 and 126 are slid toward the disk 110 by the injected hydraulic pressure, and fastening holes 133 corresponding to the pin holes 123a are formed at both ends thereof, such that the pin holes of the guide part 123 are formed. A sliding pin 134 coupled to the 123a is fixed to the fastening hole 133 through the bolt 135. In addition, the lower end of the caliper body 130, the contact portion 138 is the outer side to contact the outer pad 126 to the outer surface of the disk 110 in response to the piston 132 during the operation of the piston 132. It extends to the pad 126 side and supports the back side thereof.

According to the conventional disc brake configured as described above, the pressure of the vacuum booster acting upon the stepping of the brake pedal injects the brake oil of the master cylinder into the cylinder 131 of the caliper body 130. At this time, the piston 132 is in close contact with the disk 110 while advancing by the injected brake oil.

While the inner pad 125 is in close contact with the disk 110, the caliper body 130 reacts backward with respect to the forward action of the piston 132 by the pressure of the brake oil. At this time, the caliper body 130 moves backward while sliding in the guide hole 123 of the caliper bracket 120 through the sliding pin 134. The close contact portion 138 formed at the lower portion of the caliper body 130 moving backward pulls the outer pad 126 to closely contact the outer surface of the disk 110.

According to the above process, the contact of the disk 110 of the inner and outer pads 125 and 126 stops the rotational motion of the disk 110 through the friction force or slows down the rotational speed.

However, the conventional disc brakes have some problems in the structure of the sliding pin 134 despite their usefulness. That is, when the metal sliding pin 134 and the metal pinhole 123a are in sliding contact during the operation of the disc brake, the vibrations transmitted between the sliding pins 134 or both ends of the pinhole 123a are not absorbed. As it is delivered as it is, the sliding pin 134 and the pinhole 123a caused uneven wear or deformation.

As described above, wear or deformation of the sliding part may reduce the performance of the disc brake as well as shorten the life of the disc brake due to interference and vibration when the disc brake is operated.

Therefore, the present invention has been made in view of the above-described conventional problems, by smoothly absorbing the vibration transmitted between both ends of the sliding pin and the pinhole during brake operation, it is possible to minimize the wear and deformation of the sliding portion due to the vibration. It is to provide a sliding pin structure of the disc brake.

1 is a perspective view of a partially cut bottom view showing a conventional disc brake

Figure 2 is a cross-sectional view showing the structure of the sliding pin and the pinhole of the conventional disc brake

Figure 3 is a front view showing the sliding pin structure of the disk brake according to an embodiment of the present invention

Figure 4 is a cross-sectional view of the main portion of the disc brake to which the sliding pin structure according to an embodiment of the present invention is applied.

5 is a front view showing a sliding pin structure of the disc brake according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

34, 37: sliding pins 34a, 37a, 37b, 37c: assembly groove

34b, 37d, 37e, 37f: buffer bush

The present invention for achieving the above object is a caliper body is a sliding pin which is slidably coupled to the pinhole of the guide portion to press each pad located at both ends of the disk while flowing along the guide portion of the caliper bracket the caliper body In the sliding pin structure of the disc brake fixed to the disc, an annular assembly groove is formed on the outer peripheral surface of the sliding pin, the disc assembly is provided with a buffer bush having a diameter larger than the outer diameter of the sliding pin in the annular assembly groove Provides a sliding pin structure.

Hereinafter, an embodiment of the present invention will be described in more detail based on the accompanying drawings.

Figure 3 shows a sliding pin structure of the disc brake according to an embodiment of the present invention, an annular assembly groove (34a) is formed on the outer peripheral surface of the sliding pin 34, the annular assembly groove (34a) A buffer bush 34b having a diameter larger than the outer diameter of the sliding pin 34 is installed. The buffer bush 34b is made of a rubber material or a synthetic rubber material having high durability and abrasion resistance.

4 shows a part of the disc brake to which the sliding pin 34 provided with the cushioning bush 34b is applied, and the sliding pin 34 is fixed to both sides of the caliper body 30 with bolts 35. And is slidably coupled to the pinhole 23a formed in the guide portion 23 of the caliper bracket 20.

In the figure, reference numeral 36 denotes a pin boot that prevents foreign matter from flowing into the pinhole 23a when the sliding pin 34 slides into the pinhole 23a and prevents leakage of lubricant oil injected into the sliding portion. to be.

Accordingly, the buffer bush 34b provided on the outer circumferential surface of the sliding pin 34 absorbs vibrations generated between both ends of the sliding pin 34 and the pinhole 23a during brake operation. That is, the vibration generated from the sliding pin 34 side is partially blocked from being absorbed by the buffer bush 34b and transmitted to the pinhole 23a, and the vibration generated from the pinhole 23a side is also a buffer bush ( It is partially blocked from being absorbed by the 34b) and delivered to the sliding pin 34.

FIG. 5 shows a sliding pin structure of a disc brake according to another embodiment of the present invention, in which one sliding groove 34a and one buffering bush 34b are installed in the sliding pin 37. FIG. Unlike the embodiment, a plurality of annular assembly grooves 37a, 37b, 37c are formed on the outer circumferential surface of the sliding pin 37, and a plurality of buffer bushes are provided in the assembly grooves 37a, 37b, 37c. (37d) 37e and 37f are provided. That is, by significantly reducing the contact area between the buffer bushes 37d, 37e, 37f and the pinhole, the interference between the pinhole and the buffer bushes 37d, 37e, 37f during sliding contact is minimized. The durability of the sliding pin 37 can be improved by further improving the buffering effect of the (37d) (37e) and (37f).

In addition, among the plurality of buffering bushes 37d, 37e and 37f, the buffering bushes 37d and 37f provided on the outer side have a larger diameter and are more bufferable than the buffering bushes 37e provided on the inner side. By using this high material, the sliding in the pinhole, that is, the flow of the caliper body can be made more smooth.

As described above, the present invention forms an annular assembly groove on the outer circumferential surface of the sliding pin, and installs a buffer bush in the annular groove, thereby smoothly absorbing vibrations transmitted between the sliding pin and the both ends of the pinhole during brake operation. can do.

Therefore, the present invention can minimize the wear or deformation of the sliding pin and pinhole due to the vibration during the sliding contact, it is possible to prevent the performance degradation and shortening of the brake due to the interference and vibration of the sliding portion during operation of the brake. .

While the invention has been shown and described with respect to particular embodiments, it will be understood by those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the appended claims. Anyone can grow up easily.

Claims (3)

In the sliding pin structure of the disc brake, the sliding pin which is slidably coupled to the pinhole of the guide part to press each pad located at both ends of the disk while the caliper body flows along the guide part of the caliper bracket, And a plurality of annular assembly grooves are formed on an outer circumferential surface of the sliding pin, and a cushioning bush is installed in each of the assembly grooves, respectively. The sliding pin of the disc brake of claim 1, wherein the buffer bush installed on the outer side of the plurality of buffer bushes has a diameter larger than that of the buffer bush installed on the inner side and is made of a high buffer material. rescue. The sliding pin structure of claim 1 or 2, wherein the buffer bush is made of rubber or synthetic rubber.