KR19990013920U - Sliding pin lubrication structure of disc brake - Google Patents

Abstract

The present invention relates to a sliding pin lubrication structure of a disc brake that allows a smooth flow of lubricating oil at the time of sliding contact between a sliding pin and a pinhole, and allows the sliding pin to achieve a stable flow by releasing air smoothly. In the structure in which the sliding pin 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 is fixed to the caliper body, the outer peripheral surface of the sliding pin Accordingly, it provides a sliding pin lubrication structure of the disc brake in which a spiral lubrication groove is formed.

Description

Sliding pin lubrication structure of disc brake

The present invention relates to a sliding pin of an automobile disc brake, and more particularly, by forming a helical lubricating groove in the longitudinal direction on the outer circumferential surface of the sliding pin in sliding contact with a pin hole, the lubricant during sliding contact between the sliding pin and the pin hole. The present invention relates to a sliding pin lubrication structure of a disc brake that allows for a smooth supply of air, and at the same time, allows air escape and a smooth flow of the sliding pin.

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.

On the other hand, 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 at both ends of the upper end part. Is formed, and a guide bracket 124 is provided on the inner side of the guide part 123 to slide the inner and outer pads 125 and 126.

In addition, 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 form a cylinder ( The inner pad 125 is slid toward the disk 110 by the hydraulic pressure injected into the disk 131, and fastening holes 133 corresponding to the pin holes 123a are formed at both ends thereof to form the pin holes of the guide part 123. 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.

On the other hand, the outer circumferential surface of the sliding pin 134 is formed with a lubrication groove 134b into which grease, which is lubricating oil, is formed, thereby reducing the friction by forming an oil film at the contact portion between the pinholes 123a.

However, the lubrication grooves 134b formed in the sliding pins 134 are formed in one direction, so that the lubrication grooves 134b close to the lubrication grooves 134b, but sufficient lubrication is possible. ) And the contact portion between the pinhole 123a cannot be sufficiently lubricated, and the lubrication groove 134b is biased at one end of the sliding pin 134 so that the sliding pin 134 flows through the pinhole 123a. The loss of air pressure generated during the process was not smooth.

Accordingly, the failure of the lubrication and the air pressure release as described above to make the flow of the sliding pin unstable, thereby lowering the performance of the brake.

The present invention has been made in view of the above-described conventional problems, to ensure a smooth supply of lubricating oil at the time of sliding contact between the sliding pin and the pinhole, and at the same time to ensure a smooth flow of the sliding pin to achieve a stable flow The purpose is to provide a sliding pin lubrication structure for 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 lubrication structure of the disc brake according to the embodiment of the present invention;

Explanation of symbols on the main parts of the drawings

23a: pinhole 34: sliding pin

34b: Lubrication Groove

The present invention for achieving the above object, the caliper body is a sliding pin that is slidably coupled with 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 In the structure fixed to the body, it provides a sliding pin lubrication structure of the disk brake is formed a spiral lubrication groove along the outer peripheral surface of the sliding pin.

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

3 and 4 illustrate a sliding pin lubrication structure of the disc brake according to the embodiment of the present invention, the caliper body 30 to be slidably coupled to the pinhole 23a formed in the guide portion of the caliper bracket 20. On the outer circumferential surface of the sliding pin 34 fixed to the lubrication groove 34b for injecting a predetermined amount of lubricating oil is formed spirally in the longitudinal direction.

That is, the lubrication grooves 34b are lubrication grooves 34b and 23b in the process of perturbing the pin holes 23a by the sliding pins 34 fastened to the caliper body 30 with the bolts 35. The perturbation part, that is, is supplied between the sliding pin 34 and the pinhole 23a, and is formed from the distal end in contact with the pinhole 23a to the other distal end.

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, in the process of perturbing the sliding pin 34 and the pinhole 23a by the operation of the disc brake, the lubricating oil injected into the lubrication grooves 34b and 36 spirally forms an oil film along all the perturbation surfaces. Form uniformly.

In addition, since the spiral lubrication groove 34b forms an air flow path between the sliding pin 34 and the pinhole 23a in the above process, due to the perturbation between the sliding pin 34 and the pinhole 23a. The air pressure is discharged through the spiral lubrication groove 34b and the outside air is also sucked in, so that the sliding pin 34 flows smoothly.

As described above, the present invention forms a helical lubrication groove in the longitudinal direction on the outer circumferential surface of the sliding pin which is in sliding contact with the pinhole so that smooth supply of the lubricating oil is achieved during sliding contact between the sliding pin and the pinhole. It can prevent the wear and deformation of the air at the same time, and smooth out the air due to the perturbation of the sliding pin and pinhole.

Therefore, the present invention is useful to improve the performance of the brake because the flow resistance to the sliding pin is reduced in the perturbation process with the pinhole.

Although the present invention has been shown and described with respect to particular embodiments, it is well known 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 accompanying Utility Model Claims. Anyone who owns it can easily find out.

Claims (2)

The caliper has a sliding pin 34 slidably coupled to the pinhole 23a of the guide portion to press each pad located at both ends of the disk while the caliper body 30 flows along the guide portion of the caliper bracket 20. In the structure fixed to the body 30, the sliding pin lubrication structure of the disc brake, characterized in that the spiral lubrication groove (34b) is formed along the outer peripheral surface of the sliding pin (34). The sliding pin lubrication structure of a disc brake according to claim 1, wherein the spiral lubrication groove (34b) is formed in addition to an inner circumferential surface of the pin hole (23a).