JPH0224979Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a disc brake used in vehicles, and in particular to an insulator mounting structure that is attached to the tip of the piston and blocks braking heat from the friction pads. Regarding.

[Conventional technology]

In the case of disc brakes used in vehicles such as four-wheeled cars and motorcycles, the braking heat from the friction pads used for braking is transferred to the caliper, raising the temperature of the hydraulic fluid in the cylinder and contributing to vapor lock. Therefore, various insulation measures are being considered to prevent this.

3 and 4 show an example in which an insulator is provided in the piston in the caliper to achieve heat insulation. The piston 4 is advanced by the hydraulic fluid supplied to the hydraulic pressure chamber 5 to press one friction pad 6 against the disc rotor 7, and the reaction part 2b of the caliper 2 moves toward the action part 2a by this reaction force. The other friction pad 8 is pressed against the disc rotor 7 to perform a braking action, and an insulator 9 is mounted on the cylinder opening side of the piston 4 to prevent transmission of braking heat generated to the friction pad 6.

This insulator 9 is adhered to a mounting recess 4a provided on the front surface of the piston 4, and its outer surface is supported by a stainless steel retainer 10 having low thermal conductivity. A protrusion 10b protruding inwardly is fitted into a mounting groove 11 provided on the outer periphery of the tip of the piston 4.
Corner seal 1 for returning piston 4 to non-operating position
2, and a dust seal 13 that prevents dust inside the cylinder 3.
is fitted.

[Problem that the invention attempts to solve]

However, in the above-mentioned method, an extra ineffective dimension l is required for forming the mounting groove 11 in addition to the required length of the piston on the outer periphery of the cylinder opening of the piston 4, so the overall length of the piston 4 becomes long and the caliper 2 This increases the size of the retainer 10, leading to an increase in weight and high price, which is disadvantageous, and the uneven peripheral wall 10a of the retainer 10 due to the movement of the piston 4 back and forth.
The contact surface of the dust seal 13 that slides in contact with the dust seal 13 may be damaged, and the inclined surface 11a at the inner part of the mounting groove 11 may come into contact with the dust seal 13 and cause it to be strained.

The present invention was developed against the background of the above-mentioned circumstances, and aims to provide an insulator mounting structure for a disc brake for a vehicle that prevents transfer of braking heat while solving the above-mentioned problems.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention is a disc brake for a vehicle, which is arranged on the cylinder opening side of a piston that moves inside the cylinder of a caliper, and performs a braking action by pressing a friction pad against a disc rotor as the piston moves forward. In the insulator, a mounting recess with a diameter slightly larger than that of the insulator is formed on the side surface of the cylinder opening of the piston, and a plurality of protrusions that fit into the inner periphery of the mounting recess are provided on the outside of the peripheral wall. A retainer is formed, and the retainer housing the insulator is attached to the mounting recess of the piston with the bottom facing the friction pad side.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Pistons 20 are disposed on both sides of the disc rotor 7, which is rotatably arranged in the mounting space 2c of the caliper 2.
Friction pads 6 and 8, which are pushed by the reaction part 2b of the caliper 2, are suspended by a hanger pin 21, and the piston 20 has a mounting recess 22 formed on the side of the cylinder opening, and an insulator is inserted into the mounting recess 22. 23 is attached with a retainer 24.

The mounting recess 22 is formed to have a slightly larger diameter than the insulator 23 which is formed into a disk shape, and the retainer 24 is made of a plate material such as a stainless steel plate and has a bottom with a bottom 24b provided on the peripheral wall 24a as in the past. It is formed into a cylindrical shape, and has three protrusions 25 protruding from the outside of the peripheral wall 24a, which are fitted into the inner periphery 22a of the mounting recess 22 with a tightening margin. , the piston 20 is placed with the bottom 24b facing the friction pad 6.
It can be attached by press-fitting.

Therefore, according to this embodiment, by installing the insulator, the transmission of braking heat is blocked and the occurrence of vapor lock is prevented, and an ineffective dimension for forming the insulator mounting groove is provided on the outer periphery of the piston on the cylinder opening side. This eliminates the need for pistons and calipers, allowing the pistons and calipers to be formed to the minimum necessary size, resulting in weight and cost reductions.

Further, since the dust seal fitted into the cylinder opening does not come into sliding contact with the retainer or the mounting groove, there is no wear and tear, and the dust seal can withstand long-term use.

[Effect of idea]

As described above, the present invention has a mounting recess with a diameter slightly larger than that of the insulator, which is formed on the side surface of the cylinder opening of the piston placed inside the cylinder of the caliper, and a mounting recess with a diameter slightly larger than that of the insulator is formed on the outside of the circumferential wall. A bottomed retainer is formed with a plurality of protrusions that accommodate the insulator, and the retainer housing the insulator is installed in the piston mounting recess with the bottom facing the friction pad, thereby reducing braking heat from the friction pad. In addition to blocking the transmission well and preventing paper lock, the piston and caliper can be formed to the minimum necessary size, making it possible to reduce weight and cost.

In particular, since a plurality of protrusions are provided on the outside of the retainer's peripheral wall to fit into the inner periphery of the piston's mounting recess, these protrusions can prevent the braking heat from the friction pads from being transmitted to the piston as much as possible. Since the bottom of the retainer, which is made of a hard material with a low coefficient of friction, is installed with the friction pad side facing, the friction pads slide on the retainer during braking, and even with repeated braking, there is no damage such as wear to the insulator. , the insulation effect can be maintained for a long time.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
Fig. 1 is a perspective view of the piston, insulator, and retainer, Fig. 2 is a sectional front view of the disc brake, Figs. 3 and 4 show conventional examples, Fig. 3 is a sectional front view of the disc brake, and Fig. 4 is a sectional front view of the disc brake. The figure is also an enlarged view of the main parts. 1... Disc brake, 2... Caliper, 2
a...Action part, 2b...Reaction part, 3...Cylinder, 5...Hydraulic pressure chamber, 6, 8...Friction pad, 7...
...Disc rotor, 20...Piston, 22...
Mounting recess, 23... Insulator, 24... Retainer, 24a... Peripheral wall, 24b... Bottom, 25
……protrusion.

Claims (1)

[Scope of utility model registration request] In an insulator for a disc brake for a vehicle, which is disposed on the cylinder opening side of a piston that moves within the cylinder of a caliper, and performs a braking action by pressing a friction pad against a disc rotor as the piston moves forward, an insulator is installed on the cylinder opening side of the piston. A mounting recess with a diameter slightly larger than that of the mounting recess is bored, and a bottomed retainer is formed on the outside of the peripheral wall with a plurality of protrusions that fit into the inner periphery of the mounting recess, and the retainer housing the insulator is formed. An insulator mounting structure for a disc brake for a vehicle, characterized in that the insulator is mounted in the mounting recess of the piston with the bottom facing toward the friction pad.