JPH04101828U - disc brake - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the propagation of frictional heat to the cylinder through space without increasing the number of parts. [Structure] One end of a pad spring provided to prevent rattling of the friction pad extends around the protrusion of the piston to form a backing plate disposed around the cylinder.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a disc brake used in vehicles and the like.

0002

[Conventional technology]

Conventionally, disc brakes are placed on both sides of the disc, and the shaft of the disc is Friction pads are supported so as to be slidable in the direction, and the discs straddle these friction pads. A caliper arranged in such a way that the caliper can a cylinder facing the back surface of the friction pad; and a cylinder of the piston. a retractable boot that covers the protrusion from the disc; and a retractable boot that covers the protrusion from the Some devices are known that are equipped with a pad spring that biases toward the center side and presses against the sliding part. ing.

0003 This is because when pressure oil acts on the cylinder, one friction pad is moved by the piston. While being pressed against one side of the disk, this reaction causes the other friction pad to The caliper presses against the other surface of the disc, which causes the rotating disc to It is braked, and rattling of the friction pad is prevented by the pad spring. . The intrusion of foreign matter into the cylinder is prevented by the boot made of a flexible material. This is prevented by

0004

[Problem that the idea aims to solve]

By the way, disc brakes like the ones mentioned above are designed to be used with calipers to reduce vehicle weight. made of aluminum alloy, at least the cylinder side is made of aluminum alloy Calipers that are lightweight are known. However, these aluminum Alloy calipers conduct heat more easily, so they require more friction pads than traditional calipers. It is necessary to block the heat transmitted from etc. And a friction pad? As a technology to prevent heat conduction from the caliper to the caliper claws and from heat conduction through the piston. There is a known technology to reduce the impact by interposing a heat insulating material between them. be.

[0005] However, the heat generated by the pressure contact between the disk and the friction pad is transmitted through the space. Little consideration has been given to the points that are transmitted to the cylinder (by radiation, etc.). not present. Therefore, there has been a demand for something that can also prevent such heat transfer. deer However, adding new parts has the disadvantage of increasing the number of parts and assembly man-hours. There is a case.

[0006] This invention was devised in view of these conventional circumstances, and it allows frictional heat to be transferred through space. A structure that prevents energy from being transmitted to the cylinder is realized without increasing the number of parts. The purpose is to provide disc brakes with

[0007]

[Means to solve the problem]

The disc brake of this invention is placed on both sides of the disc, and is placed in the axial direction of the disc. friction pads slidably supported by the disk, and a disk that straddles these friction pads. The caliper is arranged in the same way, and the piston installed in the caliper and fitted inside the caliper. a cylinder facing the back surface of the friction pad; and a cylinder between the piston and the cylinder. A retractable boot is provided between the piston and the cylinder to protect the sliding part between the piston and the cylinder. and urges the friction pad toward the center in the radial direction of the disk and presses it against the sliding part. A disc brake comprising a pad spring, The pad spring is installed on the inner surface of the portion of the caliper that straddles the disc. a spring plate portion attached to press the end surface of the friction pad; and the cylinder of the spring plate portion. extending in the radial direction of the disk from the side end and disposed around the protrusion of the piston; It is characterized by consisting of a backing plate part.

[0008]

[Effect]

According to the disc brake of this invention, the heat generated by the friction pad is transferred to the caliper. Since the temperature is not directly transmitted to the wall around the cylinder, it is possible to prevent the temperature of the caliper from rising.

[0009]

【Example】

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Figure 1 shows the disc brake. Figure 2 is a longitudinal sectional view of the disc brake, Figure 3 is a front view of the pad spring. The front view and FIG. 4 are sectional views taken along line II in FIG. 3.

0010 In Figures 1 and 2, the reference numeral 1 indicates an aluminum alloy caliper. Ru. The caliper 1 is arranged to straddle the disc 2 and is fixed to the vehicle body. It is attached to the carrier 3 and is movable in the axial direction of the disk 2. this The caliper 1 has claws on both sides of its disc path portion 1a (the part that straddles the disc 2). A portion 1b and a cylinder 4 are formed. The cylinder 4 has an axial direction of the disk 2 inside. A piston 5 that is slidable in both directions is fitted. And the sliding of piston 5 The part is attached to the boot 6 attached to the opening from which the piston 5 protrudes from the cylinder 4. more covered from the outside. This boot 6 is made of a flexible material and has bellows. It expands and contracts as the piston 5 slides and always covers the opening. It is in a good condition.

[0011] Friction pads 7 and 8 are located on both sides of the disc 2 and inside the caliper 1. They are arranged respectively. The friction pads 7 and 8 have metal fibers on the back metals 7a and 8b, respectively. Pad bodies 7b and 8b made of non-asbestos material containing fibers are fixed. The upper end of each back metal (radially outer end surface of the disc 2) has convex portions 7c and 8c. Steps 7d and 8d are provided at both side edges of each back metal (end faces in the circumferential direction of the disc 2). Each is formed. In this case, these friction pads 6 and 7 are connected to the knuckle 3. A state in which the stepped portions 7d and 8d on both sides are engaged with the stepped portions 3a and 3b formed in the The disk 2 is slidably supported in the axial direction of the disk 2 by being provided therein. Further, the back surface of the friction pad 8 faces the piston 4, and the friction pad 7 faces the piston 4. The back surface is configured to face the claw portion 1b of the caliper 1.

0012 Moreover, what is indicated by the reference numeral 10 in FIGS. 1 and 2 is a pad spring. The pad spring 10 is made by plastically processing a plate material, for example, and is attached to the caliper 1. It has lower thermal conductivity than the material, has good elasticity, and has sufficient strength to protect the boots 6. It is made of a material (for example, a metal plate made of SUS) that has the following characteristics. This pa As shown in FIGS. 3 and 4, the head spring 10 extends around the opening of the cylinder 4. A backing plate portion 11 that is joined to the edge and at a position outside the boot 6, and this backing plate The main structure includes a spring plate portion 12 extending substantially perpendicularly from the portion 11. And the spring plate part 12 is curved in the opposite direction to the backing plate part 11. The mounting parts 13, 13 are engaged with both sides of the lower surface of the disc pass part 1a of the caliper 1. By doing so, the spring plate portion 12 connects the disk path portion 1a with the disk 2 or the friction member. It is attached to the caliper 1 so as to be located between the rubbing pads 7 and 8.

[0013] In the center of the spring plate portion 12 of this pad spring 10, the friction pad Pressing portions 14 are formed to elastically abut on the upper surfaces of the convex portions 7c and 8c of the doors 7 and 8, respectively. In addition, the disc of the caliper 1 is located inside the engaging portion 13 of the spring plate portion 12. Protrusions 15, 15 are formed that abut on both sides of the lower surface of the pass portion 1a, and these protrusions 15, 15, The pad spring 10 has a shape in which almost the entirety thereof is spaced apart from the lower surface of the disk path portion 1a. The friction pads 7 and 8 are urged downward (towards the radial center of the disk 2) while maintaining the It is said that the configuration is as follows.

[0014] Furthermore, the pad spring 10 is provided along the outer periphery of the boot 6. A cover portion 16 extending in a ring shape from the inside of the plate portion 11 is formed. 16 is configured to cover the outer periphery of the boot 6.

[0015] In Figs. 1 and 2, the symbols 20 and 21 are used to prevent squealing noise during braking. Alternatively, a friction pad may be used to prevent frictional heat conduction to the caliper 1 or piston 5. interposed between the backing metals of doors 7 and 8 and the claw portion 1b of the caliper 1 or the piston 5. It's a sim. The shims 20 and 21 are made of a material with low thermal conductivity (for example, a metal plate made of SUS). ).

[0016] According to the disc brake configured as described above, the cylinder 4 shown in FIG. When pressure oil is supplied from the master cylinder that is not in use, the piston 5 causes the friction pad 8 to is pressed against one surface of the disc 2, and due to this reaction, it is pushed against the claw portion 1b of the caliper 1. The friction pad 7 is brought into pressure contact with the other surface of the disk 2, and the rotating disk 2 becomes ( That is, the vehicle is braked. In addition, at this time, the disks 2 of the friction pads 7 and 8 In this case, the movement in the circumferential direction is such that the side ends of the back metals 7a and 7b of the friction pads 7 and 8 are This is prevented by contacting the inner surface of A3.

[0017] Also, due to the sliding contact between the friction pad and the disc, fire may occur depending on the braking conditions. Flowers, etc. may occur and enter the back side of the friction pad, but cover part 1 6, the boots 6 protect the wearer especially when the friction pads 7 and 8 are not worn out. This prevents the boot 6 from burning out. In addition, when the vehicle is running, Foreign matter such as sand kicked up by tires, etc., was scattered around this disc brake. Even if they collide directly with the boot 6, the cover of the pad spring 10 16, the sealing of the cylinder 4 by the boot 6 is extremely reliable. maintained with high quality.

[0018] Furthermore, the frictional heat generated at this time is conducted into the cylinder 4 via the piston 5. The path is blocked by the shim 21, and the path passing through the caliper 1 is blocked by the shim 21. The shim 20 and pad spring 10 prevent any leakage. Also, through space Heat transfer (radiation, etc.) to the wall surface around the cylinder is carried out by the backing plate part 11 and this backing plate part 1. 1 and the wall surface. That is, on either route Since heat transfer from the friction pads 7 and 8 is blocked even if the vapor lock caused by excessive temperature rise of the brake fluid. Occurrence is reliably prevented.

[0019] Furthermore, the presence of the shims 20 and 21 prevents squealing noise during braking. Further, the spring plate portion 12 of the pad spring 10 is connected to the back plate 7a of the friction pads 7 and 8. , 7b are pressed against the steps 3a, 3b of the carrier 3 in this case. This acts to tighten the friction pads 7 and 8 against the carrier 3. It will be supported without hesitation.

[0020] In other words, according to the disc brake of this embodiment, the circumference of the cylinder through the space is Structure to prevent heat transfer to the wall surface, protect boots, and prevent rattling of friction pads. This will be achieved with one pad spring 10. For this reason, the part point While keeping the number low, it prevents frictional heat from propagating to the cylinder and ensures vapor lock. It can be prevented. In addition, it is highly reliable to prevent malfunctions caused by foreign matter entering the cylinder 4. In addition, it is possible to prevent squealing noise during braking.

[0021]

[Effect of the idea]

As is clear from the above explanation, the disc brake of the present invention saves space. One pad spring has a structure that prevents frictional heat from propagating to the cylinder through the This will be realized in the future. This allows us to maintain a low parts count while also It is possible to reliably prevent problems caused by the propagation of frictional heat to the brake cylinder. It has the effect of

[Brief explanation of drawings]

FIG. 1 is a front view of a disc brake.

FIG. 2 is a longitudinal sectional view of the disc brake.

FIG. 3 is a front view of the pad spring.

FIG. 4 is a sectional view taken along line II in FIG. 3;

[Explanation of symbols]

1 Caliper 1a Part of the caliper that straddles the disc (disc pass part) 2 Disc 4 Cylinder 5 Piston 6 Boots 7, 8 Friction pad 10 Pad spring 11 Backing plate part 16 Cover part

Claims (1)

[Scope of utility model registration request] Claim 1: Friction pads disposed on both sides of a disk and slidably supported in the axial direction of the disk; a caliper disposed so as to straddle the disk and these friction pads; and a caliper provided on the caliper. a cylinder in which a piston fitted therein faces the back surface of the friction pad; a retractable boot provided between the piston and the cylinder to protect a sliding portion between the piston and the cylinder; A disc brake is provided with a pad spring that urges a friction pad toward the center in a radial direction of the disc and presses it against a sliding portion of the disc, the pad spring being attached to the inner surface of a portion of the caliper that straddles the disc. a spring plate portion that presses the end surface of the friction pad; and a backing plate portion extending in the radial direction of the disk from the cylinder side end of the spring plate portion and disposed around the protruding portion of the piston. A disc brake featuring