KR101896501B1 - Electric caliper brake - Google Patents

Abstract

An electronic caliper brake is disclosed which can forcibly roll back a piston by the restoring force of an elastic member upon releasing a brake. According to an aspect of the present invention, there is provided an electronic caliper brake comprising: a carrier having a pair of pad plates each including an inner pad plate and an outer pad plate movably installed; A caliper housing slidably installed on the carrier and provided with a cylinder in which the piston is installed so as to be movable forward and backward by braking hydraulic pressure; A spindle unit which is installed in the cylinder and receives rotational force from the actuator and converts the rotational force into linear motion to press and release the piston; And a reaction force assembly provided between the inner pad plate and the piston.

Description

[0001] ELECTRIC CALIBER BRAKE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic caliper brake, and more particularly, to an electronic caliper brake capable of forcibly rolling back a piston by a reaction force of a reaction force assembly when releasing a brake.

Generally, an electronic caliper brake employs an actuator that is electrically operated in addition to a conventional hydraulic disk brake.

Korean Patent No. 10-1184575 discloses an example of such an electronic disk brake system (hereinafter referred to as an electronic caliper brake). According to the disclosed document, there are provided a disk rotatable together with a wheel of a vehicle, a carrier provided with a pair of pad plates for pressing the disk so as to be movable forward and backward, a slider provided slidably on the carrier, An electronic caliper brake comprising a caliper housing provided with a cylinder, a spindle unit for pressing the piston, and a motor and a speed reducer for transmitting rotational force to the spindle unit.

Such an electronic caliper brake has a structure for performing a parking function by applying a braking action by the pressure of a piston according to a braking hydraulic pressure or by pressing a piston by a spindle unit which receives a rotational force of the motor and converts the rotational motion into a linear motion. At this time, the electronic caliper brake is usually a method of retracting the piston by using a sealing member and a rollback chamber to reduce the drag phenomenon in which the friction pad attached to the disc and the pair of pad plates is continuously rubbed after the braking action .

1, the sealing member 125 has a ring shape which is inserted into an annular rollback chamfer formed on the inner surface of the cylinder 121 of the caliper housing 120, and is formed between the inner surface of the cylinder 121 and the outer surface of the piston 124 . The sealing member 125 functions to prevent the brake oil from leaking between the inner surface of the cylinder 121 and the outer surface of the piston 124, thereby returning the piston 124 to its original position. That is, as shown in the figure, the piston 124 is moved in the direction of the arrow A to perform braking, and the piston 124 which has advanced due to the elasticity of the sealing member 125 after the braking operation is deformed is restored again And restoring the data. This is called roll back.

However, such a conventional electronic caliper brake can not smoothly return the piston due to a decrease in the durability of the sealing member during long-time use due to the return of the piston only by the elastic restoring force of the sealing member, thereby causing a drag phenomenon . In addition, since the deformation width of the sealing member is limited, the restoration distance of the piston is short and the restoration distance of the piston is limited.

Registration No. 10-1184575 (September 14, 2012)

An embodiment of the present invention is to provide an electronic caliper brake that can forcibly roll back a piston by a reaction force of a reaction force assembly upon braking release.

According to an aspect of the present invention, there is provided a semiconductor device comprising: a carrier having a pair of pad plates made of an inner pad plate and an outer pad plate movably installed; A caliper housing slidably installed on the carrier and provided with a cylinder in which a piston is installed so as to be movable forward and backward by braking hydraulic pressure; A spindle unit installed in the cylinder, receiving a rotational force from the actuator and converting the rotational force into a linear motion to press and release the piston; And a reaction force assembly provided between the inner pad plate and the piston.

The reaction force assembly is fixed to one surface of the inner pad plate or the piston and interposed between the inner pad plate and the piston to elastically deform as the piston is pressed toward the inner pad plate during braking And an elastic member for pushing the piston by an elastic restoring force when releasing the brake.

Also, one surface of the inner pad plate or one surface of the piston may be provided with a groove or a protrusion such that the elastic member is fastened so that the elastic pad is not separated from the inner pad plate and the piston.

The reaction force assembly may further include a first fixing member provided on one surface of the inner pad plate and a second fixing member provided on a pressing surface of the piston so as to face the first fixing member, May be provided.

The elastic member may be interposed between the first fixing member and the second fixing member so that the distance between the first fixing member and the second fixing member is variable, The electronic caliper brake may be provided such that the elastic member is elastically deformable as the distance between the two fixing members varies.

The first fixing member and the second fixing member may be provided with an electronic caliper brake having a circular ring shape and having an outer diameter smaller than the outer diameter of the piston.

The first fixing member and the second fixing member may be arranged to have an arbitrary angle with respect to the center of the surface on which the second fixing member is fixed in the piston.

The first fixing member is provided such that one end of the first fixing member contacts with the second fixing member or the piston when braking and the piston transmits a pressing force to the inner pad plate, Wherein one end of the second fixing member is in contact with the inner pad plate or the first fixing member during braking so that the piston transmits a pressing force to the inner pad plate, An electronic caliper brake may be provided which is tightly coupled so as not to be distanced beyond a certain distance.

The electromagnetic caliper brake according to the embodiment of the present invention is provided with the reaction force assembly having the elastic member between the inner pad plate and the piston so that the piston is forced to roll back to the original position by the elastic force of the elastic member .

Further, since the restoring force of the piston is improved when the vehicle is released from braking, the drag phenomenon in which the pad and the disc are in continuous contact can be prevented.

In addition, since the drag phenomenon that occurs even when the vehicle is released from braking can be prevented, the running performance of the vehicle can be improved.

1 is a view showing a state in which a piston is retracted by using a sealing member provided in a conventional electronic caliper brake.
2 is a cross-sectional view schematically showing an electronic caliper brake according to an embodiment of the present invention.
3 is an enlarged view of a portion B in Fig.
4 is a view showing a braking state according to a spindle unit of an electronic caliper brake according to an embodiment of the present invention.

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

The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

2 is a cross-sectional view schematically showing an electronic caliper brake 100 according to an embodiment of the present invention.

2, an electronic caliper brake 100 according to an embodiment of the present invention includes a disk D rotating together with a wheel of a vehicle (not shown), a pair of pad plates A carrier 110 slidably mounted on the carrier 110 and provided with a cylinder 121 in which the piston 124 can be moved forward and backward by braking hydraulic pressure, An actuator 150 which transmits a rotational force to the spindle unit 130 and a piston 124 which is provided between the pad plate and the piston 124 to release the braking force from the piston 124, And a reaction force assembly 140 for applying additional force to return to the original position.

The pair of pad plates are distinguished by an inner pad plate 111 arranged to be in contact with the piston 124 and an outer pad plate 112 arranged in contact with a fingering 122 of a caliper housing 120 to be described later. The pair of pad plates 111 and 112 are installed on the carrier 110 fixed to the vehicle body so as to be able to move back and forth toward both sides of the disk D. A friction pad 113 is attached to one surface of each of the plates 111 and 112 facing the disk D.

The caliper housing 120 is slidably mounted to the carrier 110. More specifically, the caliper housing 120 includes a cylinder 121 that is installed so that when the spindle unit 130 is installed at the rear of the caliper housing 120, the piston 124 can move forward and backward, and the outer pad plate 112 is operated And a body portion 123 connecting the cylinder 121 and the fingering 122 are formed integrally with each other.

The caliper housing 120 is provided with an oil port 127 through which brake oil is introduced so that oil pressure for braking can be applied to the inside of the cylinder 121. An oil port 127 is formed between the outer surface of the piston 124 and the inner surface of the cylinder 121, A sealing member 125 for preventing leakage of the air is provided. The sealing member 125 serves to prevent leakage of the brake oil flowing into the cylinder 121 and to return the piston 124 to its original position upon releasing the brake.

The spindle unit 130 receives rotational force from an actuator 150 constituted by a motor (not shown) and a speed reducer (not shown) and presses the piston 124 toward the inner pad plate 111 side. The spindle unit 130 includes a nut 132 that is disposed in the piston 124 and contacts the piston 124 and a screw 131 that is screwed with the nut 132.

The screw 131 is rotatably installed in the cylinder 121 so as to be parallel to the rear portion of the caliper housing 120, that is, the direction in which the nut 132 passes through the cylinder 121. The other end of the screw 131 is supported by the bearing 133 so that the screw 131 is smoothly rotated and the other end of the screw 131 is coupled with the actuator 150 do.

The nut 132 is disposed in the piston 124 in a limited rotation state and is screwed with the screw 131. [ The nut 132 moves forward and backward in accordance with the rotation direction of the screw 131 and presses and releases the piston 124. The nut 132 has a head portion 132a contacting the piston 124 and a rod 132b extending from the head portion 132a and threaded on the inner circumferential surface to be screwed with the screw 131. [ The head portion 132a and the rod 132b are integrally formed.

The electronic caliper brake 100 as described above has a reaction force assembly 140 that smoothly returns the piston 124 to its original position after the braking operation.

FIG. 3 is an enlarged view of a portion B in FIG. 2, and FIG. 4 is a view showing a braking state according to a spindle unit 130 of an electronic caliper brake 100 according to an embodiment of the present invention.

3 and 4, the reaction force assembly 140 is fixed to one surface of the inner pad plate 111 or the piston 124 and interposed between the inner pad plate 111 and the piston 124, And an elastic member 143 that elastically deforms as the piston 124 presses in the direction of the inner pad plate 111 and pushes the piston 124 by an elastic restoring force when releasing the brake.

The elastic member 143 of the reaction force assembly 140 may be a plate spring, a disc spring, or a wave spring. This is because the piston 124 can advance during braking and press the inner pad plate 111. When the brake is released, the leaf spring or the disc spring can apply the reaction force due to the elastic restoring force between the inner pad plate 111 and the piston 124 . Therefore, it is possible to improve the returning ability of the piston 124 upon releasing the brake. One surface of the inner pad plate 111 or one surface of the piston 124 may be provided with grooves or protrusions so that the elastic member 143 is fastened and is not separated from the inner pad plate 111 and the piston 124 have.

The reaction force assembly 140 includes a first fixing member 141 provided on one surface of the inner pad plate 111 and a second fixing member 141 provided on a surface facing the inner pad plate 111 of the piston 124 142 may be further included. Accordingly, the elastic member 143 may be interposed between the first fixing member 141 and the second fixing member 142.

The first fixing member 141, the second fixing member 142, and the second fixing member 142 may have a circular ring shape and may have an outer diameter smaller than the outer diameter of the piston 124.

The first fixing member 141 and the second fixing member 142 may be arranged at an arbitrary angle with respect to the center of the surface of the piston 124 on which the second fixing member 142 is fixed.

The first fixing member 141 and the second fixing member 142 are coupled to each other such that the distance between the first fixing member 141 and the second fixing member 142 can be varied to elastically deform the elastic member 143. The first fixing member 141 is configured such that one end of the first fixing member contacts the second fixing member 142 or the piston 124 during braking so that the piston 124 transmits the pressing force to the inner pad plate 111 And one end of the second fixing member comes in contact with the inner pad plate 111 or the first fixing member 141 during braking so that the piston 124 presses the inner pad plate 111 And the first and second fixing members 141 and 142 are provided so as to be tightly coupled so that the distance between the first and second fixing members 141 and 142 does not deviate by a predetermined distance or more when the brake is released have. Accordingly, one end of the first and second fixing members 141 and 142 may be coupled by a hook coupling.

As a result, the electronic caliper brake 100 according to an embodiment of the present invention is configured to forcibly return the piston 124 to its original position by the reaction force assembly 140 when the brake is released after braking, It is possible to prevent the drag phenomenon.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand. Accordingly, the true scope of the invention should be determined only by the appended claims.

100: Electronic caliper brake 110: Carrier
111: inner pad plate 112: outer pad plate
113: pad 120: caliper housing
121: cylinder 122:
123: body portion 124: piston
125: sealing member 126: rollback spring
127: Oil port 130: Spindle unit
131: screw 132: nut
132a: head portion 132b: rod
133: bearing 140: reaction force assembly
141: first fixing member 142: second fixing member
143: elastic member 150: actuator

Claims (8)

A carrier in which a pair of pad plates made of an inner pad plate and an outer pad plate are movably provided;
A caliper housing slidably installed on the carrier and provided with a cylinder in which a piston is installed so as to be movable forward and backward by braking hydraulic pressure;
A spindle unit installed in the cylinder, receiving a rotational force from the actuator and converting the rotational force into a linear motion to press and release the piston; And
And a reaction force assembly provided between the inner pad plate and the piston,
The reaction force assembly includes:
A first fixing member provided on one surface of the inner pad plate;
A second fixing member provided on a pressing surface of the piston so as to face the first fixing member; And
And an elastic member interposed between the first fixing member and the second fixing member,
Wherein the first fixing member and the second fixing member are provided in a circular ring shape and have an outer diameter smaller than the outer diameter of the piston. delete The method according to claim 1,
Wherein one surface of the inner pad plate or one surface of the piston is provided with a groove or protrusion such that the elastic member is fastened so that it is not separated between the inner pad plate and the piston. delete The method according to claim 1,
Wherein the first and second fixing members are coupled to each other such that the distance between the first fixing member and the second fixing member is variable, and the elastic member is configured such that, when the distance between the first and second fixing members varies, The elastic member is elastically deformed by pressing the elastic member in the direction of the inner pad plate and pushes the piston by the resilient restoring force of the elastic member when releasing the brake. delete The method according to claim 1,
Wherein the first fixing member and the second fixing member are arranged at an arbitrary angle with respect to the center of the surface on which the second fixing member is fixed in the piston. 6. The method of claim 5,
Wherein the first fixing member is provided such that one end of the first fixing member is in contact with the second fixing member or the piston when the brake is braked so that the piston transmits a pressing force to the inner pad plate, Wherein one end of the second fixing member is in contact with the inner pad plate or the first fixing member and the piston is provided to transmit a pressing force to the inner pad plate,
Wherein the first and second fixing members are tightly coupled to each other so as not to be distanced beyond a predetermined distance when the brake is released.

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