KR20160076256A - Caliper brake for vehicle - Google Patents

Abstract

A caliper brake for a vehicle according to an embodiment of the present invention is the caliper brake for a vehicle including: a disc; an inner plate arranged to an inboard side around the disc; an inner pad attached to the inner plate and generating a braking force when adhering to the disc; an outer plate arranged to an outboard side symmetric to the inner plate; an outer pad attached to the outer plate and generating a braking force when adhering to the disc with the inner pad; a piston pressing the inner plate to the disc; and a caliper housing having a cylinder unit wherein the piston is received and an intake of the fluid is received on one side and a finger unit pressing the outer plate to the disc on the other side. Protrusions are formed on the inner circumference of the piston. An elastic member elastically transformed by being pressed by the protrusions when the intake of the fluid is received and returning the piston to a rear side by pressing the protrusions by being elastically restored when the fluid is discharged is installed in the piston. The purpose of the present invention is to provide the caliper brake for a vehicle capable of preventing thermal damage to peripheral compartments.

Description

[0001] CALIBER BRAKE [0002]

The present invention relates to an automotive caliper brake capable of improving the restoring force of a piston and compensating for abrasion of a friction pad.

Generally, a caliper brake applied to a vehicle generally includes a caliper housing, a pair of pad plates provided with friction pads provided inside the caliper housing, and a cylinder portion provided inside the caliper housing to transmit hydraulic pressure generated in the master cylinder And a piston for pushing the pad plate disposed on one side toward the disk.

When the driver depresses the brake pedal, the hydraulic pressure is transmitted to the cylinder portion of the caliper housing to cause the piston to move toward the disc, whereby the piston presses the brake pad and rotates integrally with the wheel So that the braking is performed.

On the other hand, when the driver releases the brake from the brake pedal, the braking hydraulic pressure is released and the piston is retracted, so that the brake pad is separated from the disk and released from braking.

At this time, a sealing member for connecting the caliper housing and the piston to each other is provided on the outer peripheral surface of the piston.

The sealing member is formed of a rubber material having an elastic force, and when the braking hydraulic pressure is released, the piston moved forward is returned to the rear side using the elastic restoring force.

Accordingly, even when the hydraulic pressure transmitted to the cylinder portion is released, the piston gradually returns to the rear side through the sealing member and is separated from the disk, thereby preventing a drag phenomenon between the pad plate and the disk.

However, conventionally, there has been a problem that the sealing member is aged due to the braking action repeatedly performed for a long period of time and the elastic force is lost.

That is, since no clearance is formed between the friction pad and the disk provided on the pad plate, an excessive drag is generated between the friction pad and the disk, and heat damage to the sealing member is increased due to frictional heat generated between the disk and the friction pad There is a problem that the sealing member is damaged as well as the fluid that flows into the cylinder portion through the damaged portion leaks.

In addition, even when the driver does not perform the braking operation, braking is continuously performed irrespective of the intention of the driver, noise and vibration are generated during driving of the vehicle, and driving performance and fuel efficiency are lowered.

Japanese Patent Application Laid-Open No. 10-2004-0071891

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an additional piston returning means in the cylinder portion so that even when the friction pad is worn, The present invention provides a caliper brake for an automobile which can stably support a piston, improve a returning force of a piston to prevent occurrence of drag, and prevent premature wear of a friction pad and thermal damage of peripheral parts.

According to an aspect of the present invention, there is provided an automotive caliper brake comprising a disk, an inner plate disposed on the inboard side of the disk, a braking force applied to the disk, An outer plate disposed on an outboard side symmetrical to the inner plate, an outer pad attached to the outer plate and closely contacting the disc together with the inner pad to generate a braking force, And a caliper housing in which a cylinder portion in which the piston is received and a fluid is introduced is formed at one side and a finger portion is formed at the other side to press the outer plate toward the disk, the caliper brake comprising: Protrusion type And the cylinder portion, and the elastic deformation at the time of inflow of the fluid is pressurized by the protrusion, when the discharge of the fluid has been restored elastically resilient member that presses the projection returns the piston to the rear side is provided.

Wherein the piston has a tubular body having a front surface in contact with the inner plate and a coupling groove in which one side of the piston is coupled to an inner surface of the caliper housing and an other side of a sealing member is coupled to the outer surface, And a partition wall partitioning the interior of the partition wall and receiving pressure when the fluid is introduced, wherein the protrusions can be formed on a rear side of the partition wall portion.

The elastic member may include an annular fixing portion provided in the caliper housing, and a restoring portion extending from the fixing portion and contacting the projection.

The restoring portions may be formed at equal intervals along the inner circumferential surface of the fixing portion.

The restoring portion may include a pivoting member extending from the fixing portion along the central axis direction of the fixing portion and elastically deforming or elastically restoring through rotation, and a supporting member extending from the end portion of the pivoting member and contacting the projection .

A guide surface which is pressed by the support member when the fluid is discharged is formed in front of the projection toward the inner plate and a retaining jaw supported by the support member may be formed at the rear of the projection toward the fixing portion .

The guide surface may be inclined toward the outside of the piston.

The support member may be formed in a semicircular shape.

The projections may be formed in a plurality of along the axial direction of the piston.

According to the present invention, by providing a protrusion on the inner circumferential surface of the piston and providing an elastic member having an elastic restoring force inside the cylinder to return the piston backward together with the sealing member when the fluid pressure is released, Thereby preventing premature wear of the friction pad and heat damage to peripheral parts, improving the braking force and fuel consumption of the vehicle, and providing a comfortable driving environment.

In addition, since a plurality of protrusions formed on the inner surface of the piston and elastic members for supporting the piston in contact therewith are provided to compensate for wear of the friction pad, the distance between the disc and the friction pad is maintained constant even when the friction pad is worn, The frictional pad is firmly in contact with the disk, so that the correct braking force can be assured to the automobile.

1 is a cross-sectional view schematically showing an automotive caliper brake according to an embodiment of the present invention.
2 is a cross-sectional view schematically showing a state where a piston and an elastic member of an automotive caliper brake are installed in a caliper housing according to an embodiment of the present invention.
3 is an enlarged view of an enlarged view of the portion "A" in Fig.
4 is a perspective view showing a piston and an elastic member of a caliper brake for an automobile according to an embodiment of the present invention.
5 is a cross-sectional view schematically illustrating the operation of the piston and the elastic member in the wear of the friction pad of the caliper brake of the automobile according to the embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view schematically showing an automotive caliper brake according to an embodiment of the present invention.

1, a caliper brake for an automobile according to an embodiment of the present invention includes a disk 2, an inner plate (not shown) An inner plate 61 which is attached to the front surface of the inner plate 31 to generate a braking force when the disc 2 is in close contact with the disc 2, an outer plate 33 which is disposed on the outboard side to be symmetrical to the inner plate 31, An outer pad 63 attached to the front surface of the outer plate 33 to generate a braking force in close contact with the disk 2 together with the inner pad 61, And a cylinder portion 4 in which a piston 41 is accommodated and a caliper housing 5 in which a finger 5 for pressing the outer plate 33 toward the disk 2 is formed, (1).

More specifically, the automotive caliper brake includes a disk 2 rotating together with a caliper housing 1 and a wheel (not shown), and a pair of pad plates 31 and 33 provided on both sides of the disk 2. [ Respectively. The caliper housing 1 includes a cylinder portion 4 provided at one side and a finger portion 5 provided at the other side and connected to the cylinder portion 4. The pair of pad plates 31 and 33 are connected to the cylinder portion 4 ) And the ping rejection (5). Friction pads 61 and 63 are attached to the front surfaces of the respective pad plates 31 and 33 and a disk 2 is provided between the friction pads 61 and 63. A piston 41 capable of moving back and forth is incorporated in the cylinder 4 and connected to the piston 41 on the inner circumferential surface of the cylinder 4 to prevent foreign matter from entering the cylinder 4 And a sealing member 45 of an elastic material for restoring the piston 41 to its original position when the braking hydraulic pressure is released.

Such a caliper brake of the present automobile is used when the driver depresses a brake pedal (not shown) and the hydraulic pressure formed in the master cylinder (not shown) is transmitted to the caliper housing 1 by a power unit (not shown) The fingers 5 on the side opposite to the cylinder portion 4 connected to the cylinder portion 4 by the hydraulic pressure remaining in the cylinder portion 4 move to the inner side And pushes the outer plate 33 on the fingering reed 5 side.

Accordingly, the two friction pads 61 and 63 attached to the front surfaces of the pad plates 31 and 33 press the disc 2 positioned therebetween to perform braking. When the driver releases his / her foot from the brake pedal (not shown), the piston 41 is returned to its original position due to the elastic force of the sealing member 45, and the inner pad 61 and the fingers 5 Are spaced apart from the disk 2 by a predetermined distance.

At this time, the caliper brake of this automobile is provided with a returning device capable of returning the piston 41 to the original position through the elastic force when the oil pressure is released together with the sealing member 45 described above.

Fig. 2 is a cross-sectional view schematically showing a state in which a piston and an elastic member of a caliper brake for an automobile according to an embodiment of the present invention are installed in a caliper housing. Fig. 3 is an enlarged view of the "A" 4 is a perspective view showing a piston and an elastic member of an automotive caliper brake according to an embodiment of the present invention.

2, a protrusion 4111 is formed on the inner circumferential surface of the piston 41 of the caliper brake for an automobile according to the embodiment of the present invention. When the fluid flows into the cylinder 4, the protrusion 4111 And is elastically deformed when the fluid is discharged, and an elastic member 43 for pressing the protrusion 4111 and returning the piston 41 to the rear side is provided.

4, the piston 41 may include a tubular body 411 and a partition wall 413 disposed inside the body 411 to partition the internal space of the body 411 .

More specifically, the piston 41 is formed with an engaging groove 4113 whose front surface is in contact with the inner plate 31 and whose other side is coupled to the inner surface of the caliper housing 1, And a partition wall 413 disposed inside the body 411 to partition the interior of the body 411 and receive pressure when the fluid is introduced. At this time, the protrusion 4111 may be formed on the rear side of the partition wall portion 413.

4, the elastic member 43 may be composed of an annular fixed portion 431 and a restoring portion 433 protruding from the fixed portion 431 toward the piston 41 side.

More specifically, the elastic member 43 includes an annular fixing portion 431 provided on the caliper housing 1 and a restoring portion 433 extending from the fixing portion 431 and contacting the projection 4111 . For example, a seating groove may be formed on the inner surface of the caliper housing 1 where the cylinder part 4 is formed, so that the fixing part 431 can be seated.

The restoring unit 433 may be divided into a tilting member 4331 and a supporting member 4333 according to its role.

3, the recovery unit 433 includes a tilting member 4331 extending from the fixing unit 431 along the central axis of the fixing unit 431 and elastically deforming or elastically restoring through rotation, And a support member 4333 extending from an end of the projection 4331 and contacting the projection 4111.

The restoring portion 433 includes a pivoting member 4331 having an elastic restoring force and a supporting member 4333 for transmitting elastic restoring force of the pivoting member 4331 in contact with the projection 4111 formed on the inner surface of the piston 41 The piston 41 can be pressed and elastically deformed, or the piston 41 can be pressed through elastic restoration.

At this time, the restoration part 433 may be formed to have a structure capable of transmitting a greater elastic restoring force to the piston 41.

That is, a plurality of the restoring portions 433 may be formed at regular intervals along the inner peripheral surface of the fixing portion 431.

The protrusion 4111 formed on the piston 41 may be configured to guide the restoration part 433.

More specifically, a guide surface 4111a, which is pressed by the support member 4333 when the fluid is discharged, may be formed in front of the projection 4111 facing the inner plate 31. [

At this time, the guide surface 4111a may be formed to be inclined toward the outside of the piston 41.

That is, the guide surface 4111a is inclined at the front surface contacting with the support member 4333 so that when the fluid is discharged from the cylinder portion 4 and the oil pressure is released, the support member 4333 is naturally moved along the inclined surface, The elastic restoring force of the tiltable member 4331 can be transmitted to the entirety of the tiltable member 41 without loss.

Meanwhile, the support member 4333 may be formed to be stably movable on the guide surface 4111a.

That is, the support member 4333 extending from the end of the tiltable member 4331 may be formed in a semicircular shape.

The protrusion 4111 formed on the piston 41 may be formed in a structure that can compensate for wear of the inner pad 61.

3 and 5, a locking protrusion 4111b may be formed at the rear of the protrusion 4111 facing the fixing portion 431 and supported by the supporting member 4333 of the restoring portion 433, 4111 may be formed along the axial direction of the piston 41.

Therefore, when the inner pad 61 is worn down by a certain amount of repetitive braking action, the piston 41 moved forward by the oil pressure further moves toward the disc 2 by the amount of wear of the inner pad 61, And when the oil pressure is released, it is caught by the engagement protrusion 4111b of another protrusion 4111 disposed on the rear side of the protrusion 4111 moved forward by the worn length of the inner pad 61 The abrasion of the inner pads 61 can be compensated for thereby maintaining the same spacing between the disc 2 and the inner pads 61. [

As described above, according to the present invention, when the protrusion 4111 is formed on the inner circumferential surface of the piston 41 and the elastic member 43 having an elastic restoring force is provided inside the cylinder portion 4 to release the fluid pressure, By restoring the piston 41 to the rear side together with the member 45, occurrence of dragging is prevented to prevent premature wear of the inner pads 61 and thermal damage of peripheral parts, and the braking force and the fuel consumption of the vehicle are improved , A pleasant driving environment can be provided.

A plurality of projections 4111 formed on the inner surface of the piston 41 and an elastic member 43 supporting the piston 41 are provided to compensate for the wear of the inner pads 61, The distance between the disc 2 and the inner pad 61 is maintained at a constant level during abrasion of the disc 2, so that the inner pad 61 is surely brought into contact with the disc 2 during braking, have.

While the present invention has been particularly shown and described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And all changes and modifications to the scope of the invention.

1. Caliper housing
2. Disc
31. Inner plate
33. Outer Plate
4. Cylinder section
41. Piston
411. Body
4111. Projections
4111a. Guide surface
4111b. Jaw
4113. Coupling groove
413. Partition walls
43. Elastic member
431. Fixed Government
433. Restoration unit
4331. Pivot member
4333. Support member
45. A sealing member
5. Ping denial
61. Inner pad
63. Outer pad

Claims (9)

An inner plate attached to the inner plate and generating a braking force when the disc is in close contact with the disc, an outer plate disposed on an outboard side symmetrical to the inner plate, An outer pad attached to the outer plate and cooperating with the inner pad to generate a braking force, a piston for pressing the inner plate toward the disc, and a cylinder portion accommodating the piston and having a fluid inlet formed on one side thereof, And a caliper housing in which a finger portion for pressing the outer plate toward the disk is formed,
A projection is formed on the inner peripheral surface of the piston,
The elastic member is elastically deformed when the fluid is discharged and is elastically deformed by the protrusion when the fluid flows into the cylinder portion. The elastic member is elastically restored to return the piston to the rear side by pressing the protrusion,
A caliper brake for an automobile. The method of claim 1,
The piston
A tubular body having a front surface in contact with the inner plate and having an outer circumferential surface formed with a coupling groove in which one side of the sealing member is coupled with an inner surface of the caliper housing,
And a partition wall disposed inside the body to partition the interior of the body and receive pressure when the fluid is introduced,
And the protrusion is formed on the rear side of the partition wall portion. 3. The method of claim 2,
The elastic member
An annular fixing part provided on the caliper housing, and
And a restoring portion extending from the fixing portion and contacting the projection. 4. The method of claim 3,
Wherein the plurality of restoring portions are formed at equal intervals along the inner circumferential surface of the fixing portion. 4. The method of claim 3,
The restoring unit
A tiltable member extending from the fixing portion along the central axis direction of the fixing portion and elastically deforming or elastically restoring through rotation;
And a support member extending from an end of the tiltable member and contacting the projection. The method of claim 5,
A guide surface which is pressed by the support member is formed in front of the projection toward the inner plate when the fluid is discharged,
And a locking protrusion supported by the support member is formed at the rear of the projection toward the fixing portion. The method of claim 6,
Wherein the guide surface is formed obliquely toward the outside of the piston. 8. The method of claim 7,
Wherein the support member is formed in a semicircular shape. 8. The method of claim 7,
Wherein the protrusions are formed in a plurality of along the axial direction of the piston.

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