KR20120109121A - Disc brake - Google Patents

Abstract

PURPOSE: A disk brake is provided to reduce brake fluid consumption by performing of the braking of a vehicle by using a motor and hydraulic force at the same time. CONSTITUTION: A disk brake(100) comprises a disk, a carrier(120), and a caliper housing(130). The disk is rotated with the wheel of a vehicle. A pair of pad plates(111, 112) is installed in the carrier rubbed with the disk to be moved back and forth. The caliper housing is coupled with the carrier to be slid. The caliper housing comprises a cylinder block(135) and a finger portion(136). The cylinder block is composed of a first cylinder part(131) and a second cylinder part(132). The cylinder parts press one of the two pad plates to the disk. The finger portion and the cylinder blocks are formed into a single body.

Description

Disc brake

The present invention relates to a disc brake, and more particularly, to a disc brake that facilitates braking of the brake by using mechanical thrust and / or braking hydraulic pressure by a motor.

In general, a disc brake mounted on a vehicle is a device for decelerating, stopping or maintaining a vehicle while driving. A disc brake strongly presses a disk-shaped disk that rotates together with a wheel to a pad from both sides.

Recently, a two-cylinder type disc brake has been released to apply a strong pressure to the pad to generate a greater braking force, which is shown in FIG. 1.

Referring to FIG. 1, a two-cylinder type disc brake includes a carrier 20 in which a pair of pad plates 11 and 12 to which pads 11a and 12a are attached is slidably and braking hydraulic pressure. The disk which rotates together with the wheel while maintaining a state in which a part of the outer circumference is inserted between the caliper housing 30 in which two pistons 33 are built so as to move forward and backward, and a pair of pad plates 11 and 12. ).

The carrier 20 is mounted to a knuckle (not shown) of the vehicle body through a bolt (not shown), and a pair of pad plates 11 and 12 are slidably installed inward. The pair of pad plates 11 and 12 are in contact with the tip of the piston 33 to receive the pressure directly from the inner pad plate 11 and the outer pad plate disposed to be in contact with the finger portion 32 to be described later ( 12).

The caliper housing 30 is installed to cover the upper portion of the carrier 20, and both ends thereof are slidably assembled to the carrier 20 through the guide rod 15.

In addition, two cylinders 31 are arranged side by side while maintaining a constant interval at the rear portion of the caliper housing 30, and the pistons 33 are respectively installed to move forward and backward. In addition, the front portion of the caliper housing 30 is integrally formed with a finger portion 32 bent downward to surround the outer pad plate 12 and pushes the outer pad plate 12 toward the disc 1 during braking. .

The caliper housing 30 is provided with an inlet port 34 for guiding the braking hydraulic pressure generated in the master cylinder assembly (not shown) to the two cylinders 31. This inlet port 34 is machined using a machining tool on the rear wall of the caliper housing 30 to simultaneously communicate the two cylinders 31 with a hydraulic transmission line (not shown). . That is, the pad plates 11 and 12 press the disc 1 by the piston 33 advancing by the braking hydraulic pressure transmitted through the inflow port 34 to obtain the braking force.

However, this conventional two-cylinder type disc brake has a problem in that the amount of brake fluid is increased during braking action by supplying brake fluid to two cylinders. In order to solve this problem, a method of increasing the size of the master cylinder assembly has been proposed, but a problem arises that the volume and weight of the master cylinder assembly increase.

The present invention has been made to solve the above problems, by reducing the amount of brake fluid required by allowing the braking using the motor and hydraulic pressure together, it is possible to easily control the braking of the brake by using a motor. The purpose is to provide a disc brake.

In order to achieve the above object, the disc brake of the present invention, the disk that rotates with the wheel of the vehicle, a pair of pad plates rubbing with the disk and the carrier is removably coupled to the carrier, slidably coupled to the carrier A disc brake comprising a caliper housing, the caliper housing comprising: a cylinder block comprising a first cylinder portion and a second cylinder portion so that two pistons respectively pressing one of the pair of pad plates toward the disc are installed; And a finger part formed integrally with the cylinder block to press the other one of the pair of pad plates toward the disc, wherein the first cylinder part has a braking hydraulic pressure transmission such that a piston for pushing the pad plate toward the disc is operated. An inlet port is formed to guide the motor, and the second cylinder portion is provided with a motor for moving the piston forward and backward through a rotating shaft which is rotated forward and backward.

Preferably, the two pistons are composed of a first piston provided in the first cylinder portion and a second piston provided in the second cylinder portion, and the first and second pistons are installed to retreat with limited rotation.

According to the present invention, the second piston is provided so that one end is in contact with the pad plate and the coupling hole is formed in the center of the other end is formed with a female thread, the outer circumferential surface of the rotary shaft is formed with a male screw to be coupled to the coupling hole in the rotation of the rotary shaft Accordingly the second piston is made to retract.

Preferably, the motor further comprises a control unit for controlling and supplying a current so that the motor rotates forward and backward, wherein the control unit controls the current of the motor so that the rotation axis rotates in a forward direction when the pedal force of the brake pedal is provided, and the pedal force of the brake pedal is released. When the rotating shaft is rotated in the reverse direction to control the current of the motor.

More preferably, a pressure measuring sensor is provided for measuring the stepping force of the brake pedal, and when the pressure measured by the pressure measuring sensor falls below a pressure value preset by the controller, the current of the motor is controlled and at the same time the first pressure is measured. And a brake hydraulic pressure supplied to the inflow port of the cylinder portion, and when the set pressure value is exceeded, the brake current is supplied to the inlet port of the first cylinder portion at the same time as blocking the current of the motor.

On the other hand, the motor is preferably fixed by the fastening member in the second cylinder portion.

The disc brake according to the present invention can reduce the required amount of brake fluid than the two-cylinder type disc brake using only conventional hydraulic pressure by moving the pad plate toward the disc by hydraulic and / or mechanical thrust. In addition, it is possible to reduce the size of the master cylinder, thereby reducing the weight it is possible to ensure the ease of installation.

In addition, the use of a motor can facilitate the control of the braking operation.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be described in detail with reference to the following drawings, which illustrate preferred embodiments of the present invention, and thus the technical idea of the present invention should not be construed as being limited thereto.
1 is a plan sectional view schematically showing a conventional disc brake.
2 is a plan sectional view schematically showing a disc brake according to a preferred embodiment of the present invention.
3 is a cross-sectional view taken along line III-III ′ of FIG. 2.
4 is a cross-sectional view taken along line IV-IV ′ of FIG. 2.
5 is a block diagram showing an electrical configuration in which a motor is controlled by a control unit provided in a disc brake according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

2 is a cross-sectional plan view schematically illustrating a disc brake according to a preferred embodiment of the present invention, FIG. 3 is a cross-sectional view taken along line III-III 'of FIG. 2, and FIG. 4 is taken along line IV-IV' of FIG. 2. It is a cross section.

2 to 4, the disc brake 100 includes a disk 1 rotating together with a wheel (not shown) of a vehicle, and a pair of pad plates 111 and 112 that rub the disk 1. ) And a caliper housing (130) provided with a carrier (120), which is removably installed, and two pistons (132, 134), which are retractable to compress any one of the pair of pad plates (111, 112). do.

The carrier 120 is firmly mounted to a knuckle (not shown) of the vehicle body through a mounting bolt (not shown). The carrier 120 is provided with a pair of pad plates 111 and 112 which are rubbed with the disk 1 rotating together with a wheel (not shown) of the vehicle so as to be moved forward and backward.

In this case, the pair of pad plates 111 and 112 have inner pads 111a attached to the inner side and the outer side surfaces of the inner pad plates 111 disposed to be in contact with the distal ends of the two pistons 132 and 134. And, the outer pad 112a is attached to the inner side and the outer side is divided into the outer pad plate 112 disposed to contact the finger portion 136 of the caliper housing 130 to be described later, the inner pad plate 111 And a portion of the outer circumferential surface of the disc 1 are positioned between the outer pad plate 112 and the outer pad plate 112. Thus, the two pad plates 111 and 112 move forward and backward toward the disc 1 and braking is performed.

Meanwhile, guide holes 125 are formed at both ends of the carrier 120, and the guide holes 125 are formed to be formed at a position corresponding to the guide rod 150 installed in the caliper housing 130 to be described later. . The guide hole 125 will be described again below.

The rear of the caliper housing 130 is provided with a cylinder block 135 in which two pistons 132 and 134 are installed to be retractable, and the front portion is bent downward to operate the outer pad plate 112. The molded finger portion 136 is provided integrally with the cylinder block 135.

Meanwhile, guide rods 150 are installed at both ends of the caliper housing 130 to slidably couple the caliper housing 130 to the carrier 120. As described above, guide holes 125 are formed at both ends of the carrier 120 at positions corresponding to the positions at which the guide rods 150 are formed, so that the guide rods 150 are inserted into the guide holes 125, respectively. The caliper housing 130 is slid from the carrier 120. In this case, the guide rod 150 is installed by the bolt 152 on the fastening portion 138 provided symmetrically at both ends of the caliper housing 130.

The cylinder block 135 includes a first cylinder portion 131 and a second cylinder portion 133 on which two pistons 132 and 134 are installed.

In this case, the two pistons 132 and 134 include a first piston 132 installed in the first cylinder part 131 and a second piston 134 installed in the second cylinder part 133. The first and second pistons 132 and 134 may be installed to be able to move forward and backward in the first cylinder portion 131 and the second cylinder portion 133 in a restricted rotation state. For example, the structure for limiting the rotation of the first and second pistons 131 and 132 may include the first and second cylinder portions 131 coupled to the outer surfaces of the first and second pistons 132 and 134 and correspondingly. The inner surface of the 133 is polygonal, or the guide means (not shown) in the form of a key and a key groove are installed on the outer surface of each piston 132 and 134 and the inner surface of each cylinder portion 131 and 133. It can be implemented by.

The first cylinder portion 131 is formed with an inlet port 131a for guiding braking hydraulic pressure transmission so that the first piston 132 for pushing the inner pad plate 111 toward the disk 1 is operated. One end of the first piston 132 is disposed to be in contact with the outer surface of the inner pad plate 11, and the other end has a closed cup shape to press the inner pad plate 111 by braking hydraulic pressure. That is, as shown, as the braking hydraulic pressure generated in the master cylinder assembly (not shown) is supplied through the inlet port 131a, the first piston 131 presses the inner pad plate 111 to perform a braking action. do.

On the other hand, the sealing member 115 in contact with the first piston 132 is installed inside the first cylinder 131 to apply a restoring force to the first piston 132, the inlet portion of the first cylinder 131 The boot 116 made of a rubber material is disposed in order to prevent foreign substances from entering. Here, the sealing member 115 and the boot 116 is preferably provided in the second cylinder portion 133 in the same manner.

The second cylinder part 133 is provided with a motor 140 for advancing and retreating the second piston 134 via the rotating shaft 144 which is rotated forward and backward. The second piston 134 is configured to press the inner pad plate 111 toward the disk 1 while linearly reciprocating through the driving of the motor 140 during braking. As follows. A coupling hole 134b having a female threaded portion 134a is provided at the center of the other end of the second piston 134 installed so that one end thereof is in contact with the inner pad plate 111, and the rotary shaft is screwed to the coupling hole 134b. A male screw portion 144a is formed on the outer circumferential surface of the 144 so that the second piston 134 moves forward and backward as the rotation shaft 144 rotates. For example, when the rotation shaft 144 rotates in the forward direction (clockwise), the second piston 134 moves forward toward the disc 1, and when the rotation shaft 144 rotates in the reverse direction (counterclockwise direction), the second piston ( 134 is reversed.

The motor 140 is fixed by the fastening member 160 in the second cylinder portion 133 to smoothly transfer the driving force to the second piston 134.

The fastening member 160 is for stably fixing the motor 140 to the second cylinder part 133. For example, the fastening member 160 may be used to secure the motor 140 to the second cylinder by using a bolt or the like. It may be made of a bracket, or an adhesive pad made of an adhesive to directly fix the portion 133. That is, it should be understood that the fastening member 160 may be employed in any structure as long as the fastening member 160 is configured to fix the motor 140 to the second cylinder portion 133.

Meanwhile, in the present specification, the second piston 134 is illustrated and described as being directly connected to the rotation shaft 144 of the motor 140, but a separate speed reducer (not shown) is separately provided so as to be connected to the motor 140. ) May be transmitted to the second piston 134 in an amplified state through the reducer.

According to the present invention, a control unit (see '170' of FIG. 5) for easily controlling the driving of the motor 140 is further provided. The controller 170 is configured to supply and control a current so that the motor 140 rotates forward and backward. 5 is a block diagram illustrating an electrical configuration in which the motor 140 is controlled by the controller 170.

Referring to FIG. 5, the control of the motor 140 is performed by the controller 170 and the brake pedal 180 which apply a current through the motor driver 147. That is, the brake pedal 180 is electrically connected to an input side of the controller 170, and the motor driver 147 for driving the motor 140 is electrically connected to the output side thereof based on a signal transmitted from the brake pedal 180. Is connected. Therefore, when the driver presses the brake pedal 180 to provide a stepping force, the controller 170 controls and supplies a current to the motor driving unit 147 so that the rotation shaft 144 of the motor 140 rotates in the forward direction. When the stepping force of 180 is released, the control unit 170 controls and supplies a current to the motor driving unit 147 so that the rotating shaft 144 of the motor 140 rotates in the reverse direction.

On the other hand, the brake pedal 180 is provided with a pressure measuring sensor 182 for measuring the step force, the pressure measured by the pressure measuring sensor 182 is controlled to be driven according to the pressure value preset by the controller 170 Can be. For example, when the pedal force is provided to the brake pedal 180, if the pressure measured by the pressure measuring sensor 182 is less than the pressure value preset by the controller 170, the motor 140 may be driven by the motor driving unit 147. Control the current and supply braking hydraulic pressure to the inlet port (131a) of the first cylinder portion 131, if the set pressure value exceeds the first cylinder unit at the same time blocking the current of the motor 140 It is made to supply the braking hydraulic pressure only to the inlet port (131a) of (131).

Next, an operation of operating the brake by the disc brake 100 having the above structure will be described.

First, when a brake force is provided to the brake pedal 180 during brake braking, braking hydraulic pressure is generated through brake fluid provided from a master cylinder assembly (not shown). That is, the braking hydraulic pressure is supplied to the inlet port 131a of the first cylinder portion 131 so that the first piston 132 presses the inner pad plate 111.

At the same time, the control unit 170 controls and supplies a current to the motor driving unit 147 so that the rotating shaft 144 of the motor 140 rotates in the forward direction according to the signal transmitted from the brake pedal 180. Accordingly, the second piston 134 is moved toward the disk 1 to press the inner pad plate 111.

In addition, the caliper housing 130 slidably mounted to the carrier 120 moves in a direction opposite to the forward direction of the first piston 132 and the second piston 134, whereby the finger portion 136 is moved. By pressing the outer pad plate 112 and compressing the disk 1, a braking force is generated.

That is, according to the present invention, the first piston 132 and the second piston 134 simultaneously push the inner pad plate 111 toward the disk 1 by hydraulic and mechanical thrust, so that the braking force is smooth and smooth. Let this occur.

In this way, by braking using the driving and braking hydraulic pressure of the motor 140 together, it is possible to reduce the amount of brake fluid required than the conventional two-cylinder type disc brake. Accordingly, the size of the master cylinder assembly (not shown) for storing the brake fluid can be reduced, and the weight thereof is reduced, thereby making it possible to secure the ease of installation.

In addition, the disc brake 100 according to the present invention further provides a pressure measuring sensor 182 to operate the first piston 132 and the second piston 134 according to the stepping force of the brake pedal 180. Can be converted, and the converted operation state is as follows.

The pressure measuring sensor 182 measures the stepping force of the brake pedal 180, and transmits the measured pressure signal to the controller 170. At this time, the control unit 170 is a state in which a preset pressure value is designated, and is compared with the preset pressure value according to the applied signal. That is, when the stepping force of the brake pedal 180 measured is smaller than the preset pressure value, the current of the motor 140 is controlled through the motor driving unit 147 and at the same time the inflow port 131a of the first cylinder unit 131 is provided. The brake pedal 180 is supplied to the brake hydraulic pressure, and when the pedal pedal 180 has a larger step force than the preset pressure value, the current of the motor 140 is blocked and at the same time, the inlet port 131a of the first cylinder part 131 is provided. Supply braking hydraulic pressure only.

Meanwhile, the first and second pistons 132 and 134 are simultaneously operated or only the second piston 134 is operated according to the pressure measured by the pressure measuring sensor 182, but the present invention is not limited thereto. Can be configured to actuate the first and second pistons 132 and 134 simultaneously or actuate only the first piston 132 according to the pressure measured by the pressure measurement sensor 182 optionally by the user. Is self-explanatory.

Next, when the brake pedal 180 is released when the brake braking is released, the brake hydraulic pressure acting on the first cylinder part 131 is released and the motor 140 installed in the second cylinder part 133 rotates in the reverse direction. As the two pistons 132 and 134 together with the pair of pad plates 111 and 112 are restored, the disk 1 and the two pad plates 111 and 112 are spaced apart from each other.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

100: disc brake 111: inner pad plate
112: outer pad plate 120: carrier
130: caliper housing 131: first cylinder portion
132: first piston 133: second cylinder portion
134: second piston 135: cylinder block
136: finger 140: motor
144: rotating shaft 160: fastening member
170: control unit 180: brake pedal

Claims (6)

A disk brake comprising a disk rotating together with a wheel of a vehicle, a carrier provided with a pair of pad plates rubbing with the disk, and a caliper housing slidably coupled to the carrier.
The caliper housing,
A cylinder block consisting of a first cylinder portion and a second cylinder portion such that two pistons for pressing any one of the pair of pad plates toward the disc are respectively installed; And
A finger portion formed integrally with the cylinder block to press the other one of the pair of pad plates toward the disk;
The first cylinder portion is formed with an inlet port for guiding the braking hydraulic pressure to operate the piston for pushing the pad plate toward the disc,
And a motor for advancing and retracting the piston via the rotating shaft rotated forward and backward. The method of claim 1,
The two pistons are composed of a first piston provided in the first cylinder portion and a second piston provided in the second cylinder portion, the first and second piston disc brake, characterized in that the rotation is installed to move forward with limited state . The method of claim 2,
The second piston is provided so that one end is in contact with the pad plate and the coupling hole formed with a female thread in the center of the other end,
The outer circumferential surface of the rotary shaft is a disk thread, characterized in that the male screw is formed to be coupled to the coupling hole and the second piston is advanced in accordance with the rotation of the rotary shaft. The method of claim 1,
And a controller for controlling and supplying current so that the motor rotates forward and backward,
The control unit controls the current of the motor so that the rotation axis rotates in the forward direction when the pedal force of the brake pedal is provided, and controls the current of the motor so that the rotation axis rotates in the reverse direction when the pedal pedal is released. The method of claim 4, wherein
A pressure measuring sensor for measuring the pedaling force of the brake pedal is provided,
When the pressure measured by the pressure measuring sensor is less than the pressure value preset by the controller, it controls the current of the motor and supplies the braking hydraulic pressure to the inlet port of the first cylinder part. Disc brake characterized in that the braking hydraulic pressure is supplied only to the inlet port of the first cylinder portion while blocking the current of the motor. The method of claim 1,
And the motor is fixed by the fastening member in the second cylinder portion.

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