KR19990037724U - Sliding pin mounting structure of interference type disc brake - Google Patents

Abstract

The present invention relates to a sliding pin mounting structure of a disc brake that can improve the brake performance by minimizing the perturbation resistance of the sliding pin by preventing assembly failure according to the right angle of the sliding pin, with a focus on the caliper bracket during brake operation. A disc brake having a sliding pin for perturbing a caliper body, wherein the sliding pin is fixed to the fixing holes formed at both ends of the caliper bracket so as to extend to the caliper body, and formed at both ends of the caliper body. A sliding bush having a pinhole for perturbing the sliding pin is inserted into and fastened to the fastening hole, and a nut is fastened to an end portion of the sliding pin passing through the sliding bush.

Description

Close fit type sliding pin mounting structure of disc brake

The present invention relates to a disc brake of an automobile, and more particularly, by forcibly sliding sliding pins at both ends of a caliper bracket, and fixing a sliding bush having pinholes to perturb the sliding pins at both ends of the caliper body, It relates to a sliding pin mounting structure to overcome the assembly failure of the sliding pin due to the tightening torque (torque) of the bolt.

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 the inner circumferential surface of the cylindrical drum synchronously rotating with the wheel wheel and the brake shoe installed in the inner side of the wheel cylinder, the pad brake is in close contact with the drum brake generating a braking force, or a 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 ( A caliper bracket 120 having a 126 and a caliper body 130 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 hydraulic pressure. Consists of.

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 a guide part having pin holes 123a at both ends of the upper end part. 123 is formed, and the inside of the guide portion 123 is provided with a guide bracket 124 in which the inner and outer pads 125 and 126 slide.

The wheel 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 the piston 132 is provided in the wheel cylinder 131 to provide the wheel cylinder. The inner pad 125 is slid toward the disc 110 by the hydraulic pressure injected into the 131, and fastening holes 133 corresponding to the pin holes 123a are formed at both ends of the guide part 123. The sliding pin 134 coupled with the pin hole 123a is fixedly installed in the fastening hole 133 through the coupling hole 134a and the bolt 135.

In addition, the lower end of the caliper body 130, the fork 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 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. In this case, the caliper body 130 moves backwards while sliding in the pin hole 123a of the guide part 123 of the caliper bracket 120 through the sliding pin 134. The fork 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, in the disc brake as described above, the sliding pin 134 is fixed to the caliper body 130 through the bolt 135, so that it may maintain a firm fastening state, but is inserted into the fastening hole 133 of the caliper body 130. Due to the fastening torque of the bolt 135 rotated in a state, the assembly failure of the right angle of the sliding pin 134 may be displaced in the caliper body 130.

As such, when an assembly defect occurs according to the right angle of the sliding pin 134, the sliding pin 134 perturbed in the pinhole 123a of the caliper bracket 120 is fixed to the caliper body 130. Smooth perturbation cannot be achieved due to perturbation resistance with 123a), thereby degrading brake performance.

The present invention is conceived in view of the above-described conventional problems, the sliding pin mounting structure of the disc brake to improve the brake performance by minimizing the perturbation resistance of the sliding pin by preventing assembly failure according to the right angle of the sliding pin The purpose is to provide.

1 is a perspective view of the bottom portion of the lumbar incision showing a conventional disc brake

2 is a cross-sectional view showing a fixing structure of a sliding pin of a conventional disc brake.

Figure 3 is a cross-sectional view showing a sliding pin mounting structure of the disk brake according to an embodiment of the present invention

Explanation of symbols on the main parts of the drawings

20: caliper bracket 21: fixing hole

22: vent hole 23: sealing cap

30: caliper body 33: fastening hole

34: sliding pin 35: sliding bush

35a: pinhole

The sliding pin mounting structure of the disc brake according to the present invention for achieving the above object, in the disc brake having a sliding pin for perturbing the caliper body around the caliper bracket during brake operation, both sides of the caliper bracket The sliding pin is fixed to the fixing hole formed at the end so that the sliding pin extends to the caliper body, and a sliding bush having a pinhole to perturb the sliding pin is inserted and fixed to the fastening hole formed at both ends of the caliper body, and the sliding It is a basic feature of the technical configuration that the nut is fastened to the end of the sliding pin passed through the bush.

Hereinafter, with reference to the accompanying drawings an embodiment of the present invention in more detail as follows.

3 is a view illustrating a mounting structure of the sliding pin 34 of the disc brake according to the embodiment of the present invention, and both sides of the caliper bracket 20 have a cylindrical fixing hole 21 opened toward the caliper bracket 20. It is penetrated and fixed to the fixing hole 21 so that the sliding pin 34 extends to the caliper body 30.

In addition, fastening holes 33 penetrating in the same line as the fixing holes 21 are formed at both ends of the caliper body 30, and the fastening holes 33 pinholes 35a which perturb the sliding pins 34a. The sliding bush 35 having a) is inserted and fixed to be coupled to the sliding pin 34 fixed to the fixing hole (21).

On the other hand, the nut 34a is screwed to the outer circumferential surface of the end of the sliding pin 34 passing through the sliding bush 35 to prevent the sliding bush 35 from being separated from the sliding pin 34, and the nut ( 34a is fitted into the sliding pin 34 and the split pin 34b to prevent loosening of the nut 34a.

The sliding bush 35 is made of an alloy of copper and graphite, so that the perturbation and lubrication film formation with the sliding pin 34 is smooth.

In addition, the inner end of the fixing hole 21 has a vent hole 22 communicated to the outside for releasing pressure generated therein when the sliding pin 34 is fitted in the fixing hole 21 in an airtight state. After the coupling of the sliding pin 34 is completed, the sealing cap 23 for sealing the inside of the fixing hole 21 is covered with the outer end of the vent hole 22.

The outer circumferential surface of the sliding pin 34 exposed to both sides of the fastening hole 33 prevents foreign substances from entering, as well as elastic corrugated boot 38 and 39 for reducing leakage of lubricant injected into the perturbation part. It is covered.

According to the present invention configured as described above, in the process of reciprocating the caliper body 30 about the caliper bracket 20 by the action of the wheel cylinder according to the brake operation to the fastening hole 33 of the caliper body 30 The pinhole 35a of the fixed sliding bush 35 causes the sliding pin 34 fixed to the caliper bracket 20 to synchronously move, thereby smoothly moving the caliper body 30.

In particular, the present invention is made to insert and fix the sliding bush 35 to the caliper body 30 while forcibly fitting the sliding pin 34 to the caliper bracket 20, the tightening torque by the bolt as in the prior art Since it does not make it possible to maintain the squareness of the sliding pin 34 in the processing state. That is, when assembling the fixed hole 21, the fastening hole 33, the sliding pin 34, the sliding bush 35, which has been precisely processed to maintain the right angle, the right angle is eliminated by excluding the fastening torque of the bolt, which has a poor right angle. Since it is possible to prevent the assembly failure according to the maintenance, it is possible to significantly reduce the perturbation resistance due to poor squareness during the brake operation.

As described above, the present invention can continuously prevent the assembly failure according to the right angle of the sliding pin to minimize the perturbation resistance of the sliding pin and to overcome the deterioration of the brake performance due to the perturbation resistance of the sliding pin. It can be effective.

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)

In the disc brake provided with a sliding pin 34 to perturb the caliper body 30 around the caliper bracket 20 during brake operation, The sliding pins 34 are fixed to the fixing holes 21 formed at both ends of the caliper bracket 20 so that the sliding pins 34 extend to the caliper body 30, and fastened to both sides of the caliper body 30. A sliding bush 35 having a pinhole 35a for perturbing the sliding pin 34 is inserted into and fixed to the hole 33, and a nut is provided at an end of the sliding pin 34 passing through the sliding bush 35. Sliding pin mounting structure of the disc brake, characterized in that (34a) is fastened. The sliding pin mounting structure of the disc brake according to claim 1, wherein the sliding bush (35) is made of an alloy of copper and graphite. The sliding pin mounting structure of claim 1, wherein the nut (34a) is fitted into the sliding pin (34) and the split pin (34b). According to claim 1, wherein the inner end of the fixing hole 21 is formed with a vent hole 22 communicated to the outside, the outer end of the vent hole 22 after the coupling of the sliding pin 34 is completed Sliding pin mounting structure, characterized in that the sealing cap 23 for covering the inside of the fixing hole 21 is covered.