JPS6057024A - Disk brake - Google Patents

Abstract

PURPOSE:To simplify construction while improve safely by combining a master cylinder part in an integrated form with a wheel cylinder part and providing the bearing part of a servo-arm and a wire receiving part in an integrated form with a main body. CONSTITUTION:A master cylinder is longitudinally provided on the lower part of a main body, while a wheel cylinder 15, which is opened to a disk plate 14 side, is provided on its upper position. An arm 6 is projectingly provided toward the lower front of the body, and a servo-arm 23 is rotatably supported by a lug 25 which is vertically provided on the arm 6. Thereby, a wire receiving part which is provided along a chain stay can be provided on this arm 6, eliminating the need for using a separate part for wire receiving, and simplifying construction. Also, the arm 6 and the lug 25 can be made mutually reinforced with each other to have sufficient strength, thereby improving safety.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a disc brake with a servo arm used for bicycles, etc. In particular, the bearing part and wire holder of the servo arm are provided integrally with the main body to improve safety. high,
It provides a compact disc brake.

Conventional structure and its problems Hydraulic disc brakes for bicycles require a master turn cylinder that converts human power into hydraulic pressure, a wheel 7 cylinder that converts hydraulic pressure into pad movement, and a roadway that communicates between them. Normally, a master cylinder mechanism was provided in the handle portion, a wheel cylinder mechanism was provided in the rear wheel disc plate portion, and a pipe was used to communicate between these mechanisms.

Therefore, the brake device becomes something that requires a dog to use, which increases the cost, and also reduces usability, such as oil leakage from pipe connections in the middle and contact with other objects during use.
There were also safety issues.

Purpose of the Invention The present invention aims at miniaturization by completely integrating part of the master cylinder and part of the wheel 7 cylinder, and also includes a bearing part of the servo arm and a receiving part of the wire that transmits the force of the handle bar to part of the master cylinder. The present invention provides a highly safe disc brake with a simplified structure, which is integrated with the main body.

Structure of the Invention The disc brake of the present invention is provided with a master cylinder in the front and back direction at the bottom, a wheel cylinder above the master cylinder that communicates with the cylinder through a roadway and opens on the side, and further has a substantially triangular flat plate-shaped cylinder in the lower front part. A main body with protruding arms, a pad holder that holds a movable pad that pressurizes the disc plate and is disposed on the opening side of the wheel cylinder, and one end of which is pivotally supported by an ear that protrudes perpendicularly from the arm;
A servo arm whose other end is pivotally supported in the disk plate rotation direction ♂U of the holder, a wire receiving part provided at the end of the arm, one end which is pivotally supported at the rear of the main body, and the other end of which is a servo arm that is pivotally supported in the direction of rotation of the disk plate ♂U in the holder. The crank is connected to the master cylinder and has a push rod that pushes the piston in the master cylinder.

DESCRIPTION OF EMBODIMENTS FIG. 1 is a right side view showing a state in which a disc brake according to the present invention is attached to a vehicle body. 1 is the disc brake body, which is attached to the bracket 3 at the connection part 2 with the fixed pad holder provided above the front part, and the placket 3
is fixed to the seatstay 4 and chainstay 6. Reference numeral 6 denotes a substantially triangular plate-shaped arm that projects downward from the front of the main body 1, and a pivot arm 8 provided with a wire adjustment screw 7 is rotatably inserted into the arm 6, as shown in FIG. , is installed in Natsuto 9. 1° is an outer wire, 11 is an inner wire, and 12 is a crank with one end pivoted to the rear of the main body and the other end connected to the inner wire 11. When the wire 11 is pulled forward by operating the brake lever, the crank 12 rotates in the direction of arrow X, and a push rod 13 pivotally supported by the crank 12 acts to advance the master piston. In addition, crank 12
When the wire is rotated, the position of the wire moves up and down, but since the adjusting screw 7 provided on the rotatable arm 8 rotates in the direction of arrow y, the wire does not become twisted.

The main body 1 has a master cylinder provided in the lower part thereof in the front-rear direction, and a master piston that cooperates with the push rod 13 is completely housed therein. A wheel cylinder 15 is provided above the master cylinder and opens on the side facing the disk plate 14.

The wheel piston 16 in the cylinder 15 is advanced by hydraulic pressure applied across the road from the master cylinder and pushes against the bushing rod 17. 18 is a return spring. 19 is a movable pad, 20 is its holder, 21 is a fixed pad, and 22 is its holder. During braking, the holder 2Q is pressed against the disk plate 14 side, and the pad 19.2
1 to pinch the disk plate.

23 is a servo arm that supports the holder 20, one end of which is supported by a shaft 24 at the end of the holder 20 on the rotating side of the disk plate, and the other end is supported by an ear 26 provided vertically from the arm 6 or 8. It is supported by a shaft 26. 27 is a return spring.

Since the movable pad holder 20 is supported by the servo arm 23 as described above, the servo arm 23 is moved by the rotational force of the disk plate 14 applied to the pad 19 during braking.
rotates in an arc shape with the shaft 26 as a fulcrum as shown by arrow 2, and therefore a strong braking force is exerted due to the wedge effect between the pad 19 and the disc plate 14.

Effects of the Invention In the disc brake of the present invention, the main body 1 is provided with a master cylinder in the front-rear direction at the bottom thereof, and a wheel cylinder 15 opened toward the disc plate above the master cylinder.
Furthermore, the arm 6 is provided to protrude downward in the front, and the servo arm 23 is pivotally supported by an ear 26 provided vertically on this arm, so that the receiving part of the wire 10 along the chain stay 6 is Therefore, there is no need for a separate part for the wire receiver, and in this way, the two working parts of the wire and servo arm can be gathered in one place, making it possible to have a small and simple +14 construction. . moreover,
Since the arm 6 has a substantially triangular shape and the ears 25 are provided perpendicularly thereto, the arms 6 can reinforce each other and have sufficient strength.

Improves safety.

[Brief explanation of the drawing]

FIG. 1 is a side view showing how a disc brake according to the present invention is attached to a vehicle body, and FIG. 2 is a cross-sectional view taken along the line 1--n' in FIG. 1...Body, 6...Arm, 10...
・Outer wire, 11...inner wire,
12...Crank, 13...Push rod, 14
---Disk plate, 16...Wheel cylinder, 19...Movable pad, 20...
Holder, 23...Servo arm, 25...
··ear. Name of agent: Patent attorney Toshio Nakao and one other person JP-A-Sho GO-57024 (3)! A1 Figure 2 Figure 2

Claims (1)

[Claims] A master cylinder is provided in the lower part in the front-rear direction, and above the master cylinder, a wheel cylinder that communicates with the cylinder through a roadway and opens on the side is provided, and furthermore, a substantially triangular plate-like arm is provided to protrude downward from the front. a pad holder which holds a movable pad for pressurizing the disc plate and is disposed on the opening side of the wheel cylinder; one end is pivotally supported by an ear protruding perpendicularly from the arm, and the other end is supported by the boulder. The servo arm is pivotally supported in the rotating direction of the disc plate, and the wire receiving part provided at the end of the arm shown in the front △ is pivotally supported at one end on the ridge of the main body, and the other end is connected to the inner wire. It also has a crank equipped with a push rod that pushes the piston inside the master cylinder, and a complete disc brake.