KR100388102B1 - Caliper housing of disc brake - Google Patents

Abstract

The present invention relates to a caliper housing of a disc brake, and its object is to configure the bore and the finger portion of the caliper housing eccentrically with respect to the center line of the pad to prevent uneven wear of the pad and to improve durability and reliability.

According to the caliper housing of the disc brake according to the present invention, the pads 41 and 51 are provided with a pair of fingers 14L and 14R for attracting the bore 11 and the outer pad plate 50 in which the piston 13 is incorporated. By eccentrically configuring the disk 30 in the forward rotational direction (arrow C direction) exit side from the center line D1, the pressure of the piston 13 becomes relatively strong at the exit side of the forward rotational direction of the disk 30. Delivered. However, due to the characteristics of the disc brake, in which the surface pressure is to be concentrated at one end of the pad 41 and 51 corresponding to the inlet side of the forward rotation direction by the rotational torque of the disc 30, the actual pad 41 and 51 at the time of braking action. ), The surface pressure acts uniformly as a whole, thereby preventing uneven wear of the pads 41 and 51, thereby reducing braking noise and improving durability and reliability of the overall disc brake.

Description

Caliper housing of disc brake

The present invention relates to a disc brake, and more particularly, to a caliper housing of a disc brake provided with a finger portion for operating a bore and an outer pad plate having a piston therein.

The brake mounted on the vehicle includes a drum hydraulic brake and a disk hydraulic brake.

Conventional disc brakes obtain a braking force by strongly pressing a disk-shaped disk that rotates together with a wheel instead of a drum with pads on both sides, and a disk that rotates with the wheel, a pair of pad plates installed on both sides of the disk, and a piston A caliper housing.

The caliper housing has a bore processed to move the piston forward and backward at the center of the rear portion and a pair of fingers formed to be bent downward in the front portion to surround the outer pad plate described later. The inner circumferential surface of the bore is provided with an elastic seal to restore the piston when the braking hydraulic pressure is released, the caliper housing is provided symmetrically around the bore.

The pad plate is installed in the carrier mounted on the vehicle body so as to be spaced inwardly. An inner pad is attached to one surface and an inner pad plate is disposed such that the center of the other surface is in contact with the piston tip. It is distinguished by an outer pad plate disposed to be in contact with the inner surface.

On the other hand, the disk-shaped disk is inserted into a portion of the outer circumference between the inner pad and the outer pad, when the braking action is not made, while maintaining a constant gap with them to rotate with the wheel.

When the driver presses the brake pedal while the vehicle having the disc brake configured as described above is running, the braking hydraulic pressure generated in the master cylinder is transferred into the bore through the hydraulic line. The piston advances by braking hydraulic pressure and the inner pad plate is pushed to the disk side, whereby the inner pad is pressed against the disk to generate a braking force. In addition, since the hydraulic pressure remains inside the bore, the caliper housing itself moves in the opposite direction, whereby a pair of finger portions push the outer pad plate toward the disk and the outer pad is pressed against the disk to exert a braking force.

When the driver steps on the brake pedal, the piston is restored due to the elasticity of the seal, and the inner pad and the outer pad are again spaced apart from the disk.

However, such a conventional disc brake has a problem in that the pad for compressing the disk according to the continuous braking action is unevenly worn as shown in FIG. 1.

That is, when the piston 1 moves forward, even if the inner pad 2 and the outer pad 3 come into contact with the disk 4 that rotates in the direction of the arrow A (when the vehicle moves forward), the actual disk 4 The surface pressure of the pads 2 and 3 to be applied to the pads is concentrated to the rear side (left side in the drawing) corresponding to the entry side of the disc 4 by the rotational torque of the disc 4.

Accordingly, when the disc brake is used for a long time, the wear state of the pads 2 and 3 is biased to the rear side with respect to the center line B. FIG. The wear and tear of the pads 2 and 3 not only causes deterioration of braking performance but also causes braking noise generated between the pads 2 and 3 and the disk 4, and the life of the pads is also shortened. The reliability of the disc brake is reduced.

The present invention is to solve this problem, an object of the present invention is to improve the bore and the finger portion provided in the caliper housing to equalize the surface pressure distribution load that the pad substantially receives, thereby preventing uneven wear of the pad and product durability and reliability It is to provide a caliper housing of a disc brake which can be improved.

1 is a cross-sectional view showing a pad wear state of a conventional disc brake.

2 is a plan sectional view of a disc brake according to the invention.

Figure 3 is a schematic diagram showing an extract of the coupling state of the piston and the pad plate during the eccentric machining of the bore according to the present invention.

4 is a perspective view of a caliper housing according to the present invention.

* Description of the symbols for the main parts of the drawings *

10. Housing 11. Bore

13. Piston 14L, 14R.

20.carrier 30.disk

40,50..Pad plate 41,51..Pad

In order to achieve the above object, the present invention provides a disk rotating with a wheel, an inner pad plate, an outer pad plate, and an inner pad plate having pads attached to one side thereof, by braking hydraulic pressure. In the disc brake comprising a reciprocating piston, a caliper housing having a bore machined to install the piston in the rear portion and a pair of finger portions bent to surround both ends of the outer pad plate in the front portion,

The bore is machined eccentrically to the exit side of the disc in the forward rotation direction from the center line of the pad.

The pair of fingers is configured to be eccentrically shaped toward the exit side of the disk in the forward rotational direction from the center line of the pad.

According to this configuration, the pressure by the piston and the finger portion is applied eccentrically toward the exit side of the disc in the forward direction, but the wear state of the pad is made uniform by the rotation torque of the disc, thereby preventing uneven wear of the pad, Reliability can be improved.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

In the disc brake according to the present invention, as shown in FIG. 2, a pair of pad plates 40 and 50 are arranged to be spaced apart at regular intervals, and the carrier 20 fixed to the vehicle body and a part of the edge of the pad plate 40 ( The disk 30 is inserted between the 50 and rotates together with the wheel (not shown), and the caliper housing 10 in which the piston 13 is built to move back and forth by the braking hydraulic pressure.

The carrier 20 is bolted to the knuckle of the vehicle body, and the inner pad plate 40 having the inner pad 41 attached thereto and the outer pad plate 50 having the outer pad 51 attached thereto have a disk 30. It is installed in the longitudinal direction so as to be freely centered. At this time, the other surface of the inner pad plate 40 is disposed in contact with the tip of the piston (13).

In addition, the caliper housing 10 is mounted on both ends of the carrier 20 so as to be freely spaced through the guide rod 60, and the bore 11 and the front part are machined so that the piston 13 is removably embedded in the rear part. A pair of finger portions 14L and 14R are formed to surround both end portions of the outer pad plate 50. Reference numeral 12 is a hydraulic port machined in communication with the bore 11 so that the braking hydraulic pressure is transmitted, 15 is a seal installed on the inner circumference of the bore 11 to restore the piston 13 to its own elastic force.

On the other hand, the bore is the disk 30 so that the pressure of the piston 13 is applied relatively strongly to the exit side of the disk 30 in the forward rotational direction (arrow C direction) starting from the center lines D1 of the pads 41 and 51. Machined eccentrically toward the exit direction of forward rotation.

That is, as shown in FIG. 3, the bore 11 has the center line D2 eccentric by the length of "E" toward the exit direction of the disk 30 in the forward rotation direction starting from the center line D1 of the pads 41 and 51. The eccentricity E of the bore 11 is a value calculated in consideration of factors such as an initial thickness of the inner pad 41 and a coefficient of friction.

The eccentricity E of the bore 11 is expressed by the following equation when the initial thickness of the inner pad 41 is T and the friction coefficient of the inner pad 41 is F. FIG.

E = T × F

Therefore, when the bore 11 is eccentrically processed in consideration of the initial thickness T and the friction coefficient F of the inner pad 41, the pressing force of the piston 13 for operating the inner pad plate 40 is also the disk 30. ) Is biased toward the exit direction of the forward rotation direction, but a uniform surface pressure is applied to the entire inner pad 41 that actually rubs against the disk 30 by the rotational torque of the disk 30.

In addition, the pair of fingers 14L and 14R are provided to pull the outer pad plate 50 toward the disk 30 during the braking operation, the detailed structure of which is as follows.

3 and 4, the finger portions 14L and 14R are formed to bend downward from the front of the caliper housing 10 so as to surround the outer pad plate 50 with a predetermined space therebetween. This is formed to be divided into a pair, which is to facilitate the processing of the bore 11 in the rear portion of the caliper housing (10). In other words, the bore 11 is formed by passing the cutting tool through the space between the pair of finger portions 14L and 14R.

The pair of fingers 14L and 14R are eccentrically provided toward the outlet of the disk 30 in the forward rotational direction so as to apply an eccentric pressure to the outer pad plate 50. That is, the finger portion 14L on one side (left side in the drawing) is provided to surround one end of the outer pad plate 50 corresponding to the forward rotation entrance side of the disk 30, and the ping on the other side (right side in the drawing). Rejection (14R) is provided to surround the other end of the outer pad plate 50 corresponding to the forward rotation exit side of the disk 30, these also the disk 30 starting from the center line (D1) of the outer pad (51) ) It is molded eccentrically to a predetermined width toward the exit direction of forward rotation. In addition, the width W2 of the other finger portion 14R is provided relatively larger than the width W1 of the one finger portion 14L, so that the other finger portion 14R is closer to the other end portion of the outer pad plate 50. Widely wrapped.

Accordingly, the pressing force of the finger portions 14L and 14R for operating the outer pad plate 50 is also biased toward the exit side of the disk 30 in the forward rotational direction, whereby the surface pressure distribution load received by the actual outer pad 51 becomes uniform. This is described in detail in the operation description below.

Next, the operation and effects of the caliper housing 10 provided with the eccentric bore 11 and the finger portions 14L and 14R according to the present invention will be described.

First, when the driver steps on the brake pedal (not shown) when the vehicle moves forward, a braking hydraulic pressure is formed in the master cylinder, which is transmitted into the bore 11 through the hydraulic port 12 so that the piston 13 moves forward.

Subsequently, the inner pad plate 40 is pushed inward by the advance of the piston 13 and the disk 30 and the inner pad 41 are rotated, and the caliper housing 10 is caused by hydraulic pressure remaining in the bore 11. The finger pads 14L and 14R attract the outer pad plate 50 as the < Desc / Clms Page number 7 > .

This braking force is exerted by the forward and backward motion of the piston 13, and since the bore 11 in which the piston 13 is built is eccentrically processed by " E " toward the forward rotation direction side of the disk 30, the piston 13 ) Applies a relatively strong eccentric pressure to the other end of the inner pad plate 40 corresponding to the exit side of the disk 30 in the forward rotational direction. In addition, since the other finger portion 14R is relatively large and eccentrically shaped, the other end portion of the outer pad plate 50 corresponding to the outlet side of the disk 30 in the forward rotational direction also receives an eccentric pressure.

That is, since the bore 11 and the finger portions 14L and 14R are eccentrically provided, the inner pad plate 40 and the outer pad plate 50 may have the center line D1 of the pads 41 and 51 as a starting point. The exit side of the disk 30 in the forward rotational direction is pushed relatively strongly. In addition, due to the characteristics of the disc brake, the surface pressures of the inner pad 41 and the outer pad 51 applied to both sides of the disk 30 by the rotational torque of the disk 30 are determined by the rotation of the disk 30 in the forward rotational direction of the vehicle. Trying to concentrate on the rotating entrance.

Accordingly, although the pressure applied to the inner pad plate 40 and the outer pad plate 50 acts eccentrically toward the exit direction of the disk 30 in the forward rotational direction, the inner pad 41 and the outer pad 51 during the actual braking action. By the friction at a uniform pressure on the side of the disk 30 as a whole, the braking force is further improved, as well as the wear state of the inner pad 41 and the outer pad 51 is uniform, so that braking noise is reduced and durability is improved.

As described in detail above, according to the caliper housing of the disc brake according to the present invention, the bore in which the piston is built and the pair of finger portions which pull out the outer pad plate are eccentrically toward the exit direction of the disc forward rotation direction from the center line of the pad. By such a configuration, the pressure of the piston is transmitted relatively strongly to the outlet side of the disk in the forward rotational direction. However, due to the characteristics of the disc brake which tries to concentrate the surface pressure on one end of the pad corresponding to the forward rotation direction inlet by the rotating torque of the disk, the surface pressure acts uniformly on the actual pad during braking action. This prevents braking noise and reduces the durability and reliability of the overall disc brake.

Claims (2)

A disk rotating together with a wheel, an outer pad plate of an inner pad plate having a pad attached to one side thereof, and a piston moving forward and backward by braking hydraulic pressure to operate the inner pad plate, and a rear part A disc brake comprising a caliper housing having a bore processed to install the piston and a pair of finger portions bent to surround both ends of the outer pad plate at a front portion thereof. The bore 11 is eccentrically processed to the exit direction of the forward rotation direction of the disk 30 from the center line (D1) of the pad 41, 51, The pair of fingers 14L and 14R are formed to be eccentrically shaped toward the exit direction of the disk 30 in the forward rotation direction starting from the center line D1 of the pads 41 and 51. Caliper Housing. The method of claim 1, The pair of finger portions 14L and 14R, A first finger portion 14L surrounding one end of the outer pad plate 50 corresponding to the inlet side of the disk 30 in the forward rotation direction; And a second finger portion 14R wrapping the other end portion of the outer pad plate 50 corresponding to the outlet side in the forward rotation direction of the disc 30 in a wider range than the first finger portion 14L. Caliper housing of the disc brake.