KR19980067667U - Pin Hole Lubrication Structure of Disc Brake - Google Patents

Abstract

The present invention relates to a pinhole lubrication structure of a disc brake that prevents the sliding pin from sticking out due to exhaustion of lubricant by ensuring smooth supply of lubricant during sliding contact between the sliding pin and the pinhole. The caliper body has a caliper In the pinhole structure of the disc 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 while flowing along the guide portion of the bracket In addition, it provides a pinhole lubrication structure of the disc brake in which an annular lubrication groove is formed in which a predetermined lubricating oil is injected into the inner circumferential surface of the sliding pin.

Description

Pin Hole Lubrication Structure of Disc Brake

The present invention relates to a pinhole of an automobile disc brake, and more particularly, by forming a concentric lubrication groove acting as a lubricating oil pocket on the inner circumferential surface of the pinhole in which the sliding pin is in sliding contact. The present invention relates to a pinhole lubrication structure of a disc brake for smooth supply of lubricating oil during sliding contact with 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.

Meanwhile, grease (grease), which is a lubricating oil, is formed between the sliding pins 134 and the pinholes 132a to form an oil film at their sliding contact portions to achieve a smooth flow.

However, since the lubricating oil is injected into the narrow gap between the sliding pin 134 and the pinhole 123a, the amount did not satisfy the amount necessary for sufficient lubrication. Since the insufficient lubricating oil is exhausted due to friction between the pinhole 123a and the sliding pin 134, the sliding pin 134 is stuck to the pinhole 123a.

The sintering phenomenon as described above causes the wear and deformation of the sliding pins 134 and the pinholes 123a due to the excessive perturbation resistance, and also deteriorates the performance of the disc brake and shortens the life.

Therefore, the present invention has been devised in view of the conventional problems as described above, and by allowing the smooth supply of the lubricating oil during the sliding contact between the sliding pin and the pinhole, it is possible to prevent the sticking phenomenon of the sliding pin due to exhaustion of the lubricating oil. It is to provide a pinhole lubrication 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

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

4 is an enlarged cross-sectional view taken along the line A-A of FIG.

Explanation of symbols on the main parts of the drawings

23a: pinhole 23b: lubrication groove

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 which forms the pinhole in the said guide part, it provides the pinhole lubrication structure of the disc brake in which the annular lubrication groove into which predetermined lubricating oil is inject | poured is formed in the inner peripheral surface of the said sliding pin.

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

3 and 4 illustrate the pinhole lubrication structure of the disc brake according to the embodiment of the present invention, in which a predetermined amount of lubricant is injected into the inner circumferential surface of the pinhole 23a formed in the guide portion 23 of the caliper bracket 20. An annular lubrication groove 23b is formed. That is, in the process of the sliding pin 34 fastened to the caliper body 30 with the bolt 35 by perturbing the pinhole 23a, the lubrication groove 23b is a perturbation part of the lubricating oil, that is, with the sliding pin 34. Supply is made between the pinholes 23a.

In the figure, reference numeral 36 is a pin boot that prevents foreign matter from entering the pinhole 23a while the sliding pin 34 perturbs the pinhole 23a and prevents leakage of lubricant oil injected into the perturbation site. .

Accordingly, the lubricating oil injected into the lubrication groove 36 during the perturbation of the sliding pin 34 and the pinhole 23a by the operation of the disc brake is supplied along the perturbation surface to continuously form an oil film at the perturbation site. .

Therefore, the present invention prevents the exhaustion of the lubricating oil according to the supply of the lubricating oil, which is insufficient in the prior art, thereby preventing the sticking phenomenon of the sliding pin 34 as well as increasing the durability of the sliding pin 34 and the pinhole 23a. .

As described above, the present invention forms a lubrication groove that serves as a lubricating oil pocket on the inner circumferential surface of the pinhole so that the smooth supply of the lubricating oil can be prevented during perturbation between the sliding pin and the pinhole, thereby preventing the exhaustion of the lubricating oil.

Therefore, the present invention can prevent the sticking phenomenon of the sliding pin due to the exhaustion of the lubricating oil, and can prevent the wear or deformation of the perturbation part caused by excessive perturbation resistance due to the squeeze phenomenon, and thus the performance of the disc brake The problem of degradation and shortening of life can be solved.

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 (2)

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, the pinhole lubrication structure of the disc brake, characterized in that an annular lubrication groove is formed in the inner peripheral surface of the sliding pin is injected. The pinhole lubrication structure of a disc brake according to claim 1, wherein the lubrication groove is replaced by an annular lubrication groove formed in the outer circumferential surface of the sliding pin.