JP2001124118A - Disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc brake capable of dispensing with a wide installation space on a moving shaft of a pad. SOLUTION: This disc brake comprises a brake caliper 11 held on a supporting part 10, a pair of pads 13 mounted in the brake caliper 11, holding a disc and producing the braking force, a piston driving mechanism 14 pressing the pads 13 in the brake caliper 11 for producing the braking force, and an actuator 16 mounted on the brake caliper 11 at a position not overlapped to a moving axis 15 of the pads 13 at braking, and driving the piston driving mechanism 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake suitable for use in automobiles, railway vehicles, industrial machines and the like.

[0002]

2. Description of the Related Art Conventionally, in an electric disk brake, for example, a thrust force of a reducer, a motor, or the like is provided on a moving axis of a pad, such as an electromechanically operable disk brake disclosed in Japanese Patent Application Publication No. 10-504876. It was common for a generator to be located.

That is, Japanese Patent Application Laid-Open No. 10-504876.
As disclosed in Japanese Unexamined Patent Publication, a friction pad 4, 5 is disposed in a brake caliper 1 as shown in FIG. By clamping the disc 3, a brake is applied. In order to apply a thrust to the friction pad 4, an electric motor 6 and a speed reducer 7 are arranged on a moving axis of the friction pad 4.

[0004]

However, in the above-mentioned conventional disk brake, the friction pads 4,
Since the width of the moving pad 5 on the moving axis becomes large, there is a problem that it becomes difficult to use the friction pad when a large installation space cannot be taken on the moving axis of the friction pad as in a railway car, for example. An object of the present invention is to solve such a problem, and to provide a disc brake that does not require a very large installation space on a moving axis of a pad.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned technical problems, the present invention provides a brake caliper held by a support portion and a brake caliper arranged in the brake caliper to generate a braking force across a disk. A pair of pads, a piston drive mechanism that generates a braking force by pressing the pad within the brake caliper, and the piston drive mechanism that is disposed on the brake caliper at a position that does not overlap the axis of movement of the pad during braking. The disk brake is provided with a driving actuator.

Further, the present invention can be configured such that the piston drive mechanism is of a hydraulic type, and a connection oil passage between the actuator and the piston drive mechanism is arranged along an arm of the brake caliper. Further, the oil passage may be arranged in the arm. Further, the piston drive mechanism may be of a rotary / linear motion conversion type, and may be provided with a rotation drive transmission unit for transmitting the drive of the actuator.

As described above, according to the structure of the present invention, since the actuator is located at a position that does not overlap with the movement axis of the pad, the actuator can be installed even if there is not so much installation space on the movement axis of the pad.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a disc brake according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view showing a first embodiment of a disc brake according to the present invention, and FIG. 2 is a sectional view showing a second embodiment of the disc brake according to the present invention.

(First Embodiment) As shown in FIG.
The railway vehicle disc brake 1 according to the first embodiment of the present invention includes a brake caliper 11 held by a support portion 10.
And the wheel 12
The brake caliper 11 includes a pair of pads 13 that generate a braking force, and a hydraulic piston drive mechanism 14 that presses the pads 13 within the brake caliper 11 to generate a braking force. . The disc brake 1 includes an actuator 16 that is disposed on the brake caliper 11 at a position that does not overlap with the movement axis 15 when the pad 13 is braked, and that drives a piston drive mechanism 14.

The actuator 16 includes a motor 20, a speed reducer 21, a ball screw 22, a piston 23 and a cylinder 2
In the present embodiment, the actuator 16 is disposed at the base of the brake caliper 11.
The cylinder 24 of the actuator 16 is connected to the cylinder 25 of the piston drive mechanism 14 by an oil passage 26. The oil passage 26 is arranged along the arm 27 of the caliper 11, and in the present embodiment, the oil passage 26 is provided inside the arm 27.

Next, the operation of the disc brake 1 will be described. In the disc brake 1, the holding and release of the braking force is performed by the rotation of the motor 20. That is, when a brake controller (ECU) (not shown) receives a brake command, electric power is supplied to the motor 20 and the motor 20 rotates to generate a predetermined torque. The rotation of the motor 20 is reduced by a speed reducer 21 and the ball screw 2
2 converts the rotational motion into a linear motion. As a result, the piston 23 in the cylinder 24 of the actuator 16 is pushed out, and the brake oil in the cylinder 24 is discharged through the oil passage 26 to the cylinder 25 of the piston drive mechanism 14.
Supplied to

Then, the piston 2 in the cylinder 25
8 is pressed to urge the pad 13 toward the disk. As a result, the pad 13 is pressed against the disk to generate a braking force.

As described above, in the disc brake 1 according to the first embodiment of the present invention, the actuator 16 is disposed on the brake caliper 11 at a position that does not overlap the movement axis 15 of the pad 13 during braking. Pad 13
Can be prevented from becoming too large on the moving axis 15. Therefore, the disc brake 1 can be installed even in a case where the installation space on the movement axis 15 of the pad 13 cannot be widened as in a railway car, for example.

(Second Embodiment) FIG. 2 shows a disc brake 3 according to a second embodiment of the present invention. The disc brake 3 includes a brake caliper 31 held by a support portion 30, a pair of pads 33 that are arranged in the brake caliper 31 and generate a braking force across discs located on both side surfaces of the wheel 32, A rotation / linear motion conversion type piston drive mechanism 34 for generating a braking force by pressing a pad 33 in the brake caliper 31 is provided.

The disc brake 3 is disposed on the brake caliper 31 at a position where the disc brake 3 does not overlap with the movement axis 35 when the pad 33 is braked, and a motor 36 as an actuator for driving a piston drive mechanism 34, A rotation drive transmission mechanism 37 for transmitting the rotational force to the piston drive mechanism 34.

The rotation drive transmission mechanism 37 includes a pulley 39 fitted on a rotation shaft 38 of a motor 36, and a pulley 3
9 and a belt 40 wound therearound. The piston drive mechanism 34 includes a piston 41 that urges the pad 33 toward the disk, a ball screw 42 that presses the piston 41, and a pulley 43 around which the belt 40 of the rotation drive transmission mechanism 37 is wound. .

Next, the operation of the disc brake 3 will be described. The disc brake 3 also holds and releases the braking force by the rotation of the motor 36. That is, when a brake controller (ECU) (not shown) receives a brake command, the rotating shaft 38 of the motor 36 rotates, and this rotating force is transmitted to the ball screw 42 via the pulley 39, the belt 40, and the pulley 43, This allows
Rotational motion is converted to linear motion. Then, the piston 41 is pressed toward the pad 33 by the ball screw 42,
The pad 33 is pressed against the disc to apply the brake.

As described above, the disc brake 3 according to the second embodiment of the present invention also has the motor 3 as an actuator.
6 is disposed at a position off the movement axis 35 of the pad 33, in this embodiment, at the base of the brake caliper 31, so that even if the installation space on the movement axis 35 of the pad 33 cannot be widened, the disk A brake 3 can be installed. In the above-described embodiment, a hydraulic mechanism or a belt transmission mechanism is used as the power transmission mechanism. However, other suitable power transmission means can be used.

[0019]

As described above, according to the disk brake of the present invention, since the actuator is located at a position not overlapping the moving axis of the piston driving mechanism, it is located on the moving axis of the piston driving mechanism, for example, on the side opposite to the pad. Even if there is not such a large installation space, the disk brake can be installed, and a disk brake which does not require a large installation space on the moving axis of the pad can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a disc brake according to the present invention.

FIG. 2 is a cross-sectional view showing a second embodiment of the disc brake according to the present invention.

FIG. 3 is a sectional view showing a conventional disc brake.

[Explanation of symbols]

 1, 3 Disc brake 10, 30 Support portion 11, 31 Brake caliper 12, 32 Wheel 13, 33 Pad 14, 34 Piston drive mechanism 16, 36 Actuator 26 Oil passage 27 Arm 37 Rotational drive transmission means

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3D048 BB59 CC54 HH18 HH50 HH55 HH58 3J058 AA48 AA53 AA63 AA69 AA77 AA78 AA83 AA87 BA67 CC03 CC15 CC25 CC33 CC35 CC63 CC77 CC78 FA01 FA11 FA21 FA31

Claims (4)

[Claims] A brake caliper held by a support portion; a pair of pads arranged in the brake caliper for generating a braking force across a disc; and a braking force by pressing the pad in the brake caliper. A disc brake, comprising: a piston drive mechanism that generates a force; and an actuator that is disposed on a brake caliper at a position that does not overlap the movement axis of the pad during braking, and that drives the piston drive mechanism. 2. The piston drive mechanism is of a hydraulic type,
The disk brake according to claim 1, wherein an oil passage connecting the actuator and the piston drive mechanism is arranged along an arm of the brake caliper. 3. The disc brake according to claim 2, wherein the oil passage is disposed in the arm. 4. The disk brake according to claim 1, wherein said piston drive mechanism is a rotary-to-linear motion conversion type, and further comprises a rotation drive transmission means for transmitting drive of said actuator.