JPS621463Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a scissor-shaped disc brake that clamps and brakes the outer periphery of a rotating rotor, and uses a return spring to separate the rotor from the friction pad that is clampingly braked when the brake is released. Regarding equipment.

The applicant of the present invention previously developed a scissor-type disc brake that clamps and brakes the rotor via friction pads. The disc brake is a disc brake fixed in the tangential direction of the rotor near the outer circumference of the rotor.
A pair of seesaw-shaped levers extending in opposition to each other are pivotally attached to the anchor pin of the book, and a scissor-shaped lever is positioned between the lever portions in front of the anchor pin with respect to the rotor. At the same time, a cylinder for hydraulic control is pivotally connected to the anchor pin, and the piston of the cylinder is connected to the end of the lever section rearward with respect to the rotor of the scissor-shaped lever via the lever pin and a pair of brackets. The pair of brackets are configured to form an inverted V shape with respect to the rotor, and a friction pad for clamping the outer circumference of the rotor is attached to the inner end of the front lever portion, and the cylinder When the lever is actuated to push out the piston, a scissor-shaped lever rotates around the anchor pin, and the friction pads clamp the rotating rotor and brake it. The return spring device for separating the rotor and the friction pads when the disc brake is released has a return spring tensioned between the front lever portions so as to spread the distance between the front lever portions.

On the other hand, in this type of disc brake, if the gap between the friction pad and the rotor can be adjusted, there is a pad holding device fitted to the inner end of the front lever part to prevent the friction pad from falling off. Also, if the friction pad is on a disc, uneven wear on the lining causes the pad to rotate and the contact surface to change, so a detent is required to obtain a uniform braking effect. It was hot.

The object of the present invention is to provide a return spring device that serves both as a pressing device and a rotation stopper for the above-mentioned friction pad.

Embodiments of the present invention will be described below with reference to FIG. 1 of the accompanying drawings.

FIG. 1 is a partial cross-sectional plan view of a scissor-shaped disc brake for explaining the device of the present invention. Reference numeral 1 denotes an anchor pin fixed in the tangential direction of the rotor 2 near the rotor outer circumference 2a. This anchor pin 1 has a cylinder 3 for hydraulic control.
A pair of seesaw-shaped levers 4 and 4' extending in opposition to each other are rotatably attached to one end 3a of the lever. A flat back metal 5a is inserted into the recesses 4b and 4'b provided at the inner ends of the lever parts 4a and 4'a of the seesaw-shaped levers 4 and 4' in front of the anchor pin 1 on the rotor side.
Friction pads 5, 5 each having a lining material 5b formed in a convex shape are fitted thereon. 6 is friction pad 5
This is an adjustment tool for adjusting the gap between the rotor 2 and the rotor 2 when the rotor 2 wears out.

On the other hand, the operating end 7a of the piston 7 built in the cylinder 3 and the ends 4d, 4'd of the rear lever parts 4c, 4'c are connected to the operating pin 8, the bracket 9,
9' and lever pins 10 and 10', and when the cylinder 3 is actuated to push out the piston 7, the rear lever parts 4c and 4'c are expanded, and a seesaw-shaped lever moves around the anchor pin 1. 4,
4' rotates slightly, and the friction pads 5, 5 attached to the front lever parts 4a, 4'a clamp and brake the rotating rotor outer peripheral part 2a.

The return spring device of the present invention is
A coil spring 11 having extensions 11a, 11a at both ends is wound around the anchor pin 1, and the extensions 11a, 11a are attached to the friction pads 5, 11a.
5, respectively, and the front lever portions 4a, 4'
A is set so that it expands due to the spring force of the coil spring 11. In addition, 12 is a parking rod, an adjustment nut 13 and a bracket 1.
4 and is engaged with the actuating pin 8 through the parking rod 12 to operate the brake manually by actuating a parking lever (not shown) connected to the parking rod 12.

Since the present invention is constructed as described above, it not only prevents the friction pad from falling off, but also prevents rotation when using a disc-shaped friction pad, which not only achieves the desired results, but also has a simple structure and parts. The present invention provides a return spring device for a scissor-shaped disc brake that is extremely useful because it can reduce the number of points, leading to cost reduction.

[Brief explanation of drawings]

FIG. 1 shows a partially sectional plan view of a scissor-shaped disc brake using the return spring device of the present invention. 1... Anchor pin, 2... Rotor, 3... Cylinder, 4, 4'... Seesaw type lever, 5...
Friction pad, 6... Adjustment tool, 7... Piston, 8
...Operating pin, 11...Coil spring.

Claims (1)

[Scope of utility model registration request] A lever in front of the anchor pin on the rotor side of a pair of seesaw-shaped levers that are pivotally connected by one anchor pin located in the tangential direction of the rotor near the outer periphery of the rotor and extend in opposition to each other. A scissors type mechanism in which the outer circumference of the rotor is positioned between the sections, and at the same time as the rear lever section is expanded, a friction pad attached to the inner end of the front lever section clamps and brakes the rotating outer circumference of the rotor. In this disc brake, a coil spring having extensions at both ends is wound around the anchor pin, and the extensions are engaged with a friction pad attached to the inner end of the front lever part. Disc brake return spring device.