KR19980067659U - Pinhole Structure of Disc Brake - Google Patents

Abstract

The present invention relates to a pinhole structure of a disc brake that can smoothly absorb vibrations generated between both ends of a sliding pin and a pinhole, thereby minimizing abrasion and deformation of the sliding portion caused by the vibration. In the pinhole structure of the disc brake in the pinhole structure of the disk brake to form a pinhole slidably coupled with the sliding pin fixed to the caliper body to press each pad located at both ends of the disk, the guide pin, the inner peripheral surface of the sliding pin An annular groove is formed in the annular groove, and an annular buffer bush is provided in contact with the outer circumferential surface of the sliding pin.

Description

Pinhole Structure of Disc Brake

The present invention relates to a pinhole of an automobile disc brake, and more particularly, an annular assembly groove is formed on an inner circumferential surface of a pin hole in which a sliding pin is in sliding contact, and a cushioning property is provided in the annular assembly groove. The present invention relates to a pinhole structure of a disc brake capable of smoothly absorbing vibrations generated during sliding contact between a sliding pin and a pinhole.

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 pinhole 123a despite their usefulness. That is, when the metal pinhole 123a and the metal sliding pin 134 are in sliding contact during the operation of the disc brake, vibrations transmitted between both ends of the sliding pin 134 or 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 devised in view of the above-described conventional problems, and by smoothly absorbing the vibrations transmitted between both ends of the sliding pin and the pinhole when the brake is operated, the wear and deformation of the sliding part due to the vibration can be minimized. It is to provide a pinhole structure of a 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

3 is a cross-sectional view of the main portion showing the pinhole structure of the disk brake according to an embodiment of the present invention

Figure 4a is a side view showing a buffer bush according to an embodiment of the present invention

Figure 4b is a cross-sectional view showing a buffer bush according to an embodiment of the present invention

Explanation of symbols on the main parts of the drawings

23a: pinhole 23b: assembly groove

24: buffer bush 24a: oil path

34: sliding pin

The present invention for achieving the above object is slidably coupled with the sliding pin fixed to the caliper body to press each pad located at both ends of the disk while the caliper body flows along the guide portion of the caliper bracket In the pinhole structure of the disc brake forming the pinhole in the guide portion, an annular assembly groove is formed in the inner circumferential surface of the sliding pin, and an annular cushioning bush in contact with the outer circumferential surface of the sliding pin is formed in the annular assembly groove. Provides a pinhole structure of the disc brake to be installed.

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

3 illustrates a pinhole structure of a disc brake according to an embodiment of the present invention, and an annular assembly groove 23b is formed in the pinhole 23a formed in the guide portion 23 of the caliper bracket 20. Three or more buffer bushes 24 having a diameter smaller than the inner diameter of the pinhole 23a are provided in the annular assembly groove 23b. That is, as shown in FIG. 4B, the buffer bush 24 has a thickness t of 10 to 20% of the length of the pinhole 23a, and an outer diameter d of 110 to 125% of the outer diameter of the pinhole 23a. Most preferably, the thickness th between the outer diameters is set to 5 to 25% of the outer diameter of the pinhole 23a.

On the other hand, the inner circumferential surface of the buffer bush 24, that is, the portion in contact with the sliding pin 34 fixed to the caliper body 30, as shown in Figure 4a, a plurality of greases to smooth the flow of the lubricant The oil flow passage 24a is formed in a recess.

The buffer bush 24 is made of a rubber material or a synthetic rubber material having high durability and abrasion resistance. In the figure, reference numeral 35 is a bolt coupled to the fastening hole 34a of the sliding pin 34, and 36 is a foreign material flows into the pinhole 23a when the sliding pin 34 is perturbed in the pinhole 23a. The pin boot prevents leakage of lubricant oil injected into the sliding part.

Accordingly, the buffer bush 24 provided on the inner circumferential surface of the sliding pin 34 absorbs vibration 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 24 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 24 and delivered to the sliding pin 34.

Further, by providing a plurality of buffer bushes 24 in the pinholes 23a, the contact area between the buffer bushes 24 and the pinholes 23a is remarkably reduced, and the pinholes 23a and the buffer bushes in sliding contact. Minimize the interference between the (24) and at the same time to further improve the buffering effect of the buffer bush 24 can increase the durability of the sliding pin 34 and the pinhole (23a).

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

Therefore, the present invention can minimize the wear and deformation of the pinhole and the sliding pins according to the transmission of vibration, thereby minimizing the performance degradation and the shortening of the brakes caused by the interference and vibration of the sliding pin and the pinhole during the operation of the brake. Can be.

Although the present invention has been shown and described in connection with specific embodiments, it is common knowledge 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 utility model registration claims. Anyone who has a can easily know.

Claims (4)

Of the disc brake which forms a pinhole slidably coupled with a sliding pin fixed to the caliper body to press each pad positioned at both ends of the disc while the caliper body flows along the guide portion of the caliper bracket. In the pinhole structure, an annular groove is formed in the inner circumferential surface of the sliding pin, and an annular buffering bush is provided in the annular groove. The pinhole structure of claim 1, wherein the groove and the buffer bush are formed in plural numbers. 2. The pinhole structure of a disc brake according to claim 1, wherein a plurality of oil passages are formed in the inner circumferential surface of the buffer bush. The pinhole structure of a disc brake according to any one of claims 1 to 3, wherein the buffer bush is made of rubber or synthetic rubber.