JPS6324270Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a disc brake, particularly an open-top disc brake for two-wheeled vehicles.

This is a floating type disc brake for two-wheeled vehicles, and in consideration of heat dissipation effect, pad replaceability, and observation of wear conditions, the brake pad is installed at the upper part of the caliper in the middle of the disc rotation direction (outside the disc insertion groove in the disc radial direction). In so-called open-top type brake pads that have a substantially square opening, the brake pad is generally supported by a guide pin installed parallel to the brake piston in the opening.

By the way, this type of disc brake requires the caliper to receive the torque applied to the brake pads during braking.

In conventional disc brakes, in order to receive this braking torque, the lower side of the pad back metal (on the center side of the disc) was brought into contact with the caliper. However, in order to do this, a guide groove is provided in the cylinder part of the caliper in the disk axial extension of the disk storage groove, and a guide groove is provided in which the pad back metal on the cylinder side comes into contact, and a wheel side pad back metal is locked on the arm side. Grooves or protrusions for attaching support pins had to be provided, making the structure very complicated and requiring time and effort to manufacture. Furthermore, it is necessary to make the length of the guide groove longer than the stroke of the brake piston, which causes the caliper to become longer in the axial direction of the piston, resulting in a disadvantage that the brake becomes larger in the direction where the assembly space is limited.

It is also possible to use guide pins to receive the braking torque that acts on the pads, but this method requires the guide pins to have great strength, so it is necessary to increase the pin diameter or increase the number of guide pins used. In addition, the pin has a very small contact surface with the pad, and since braking force is applied there, it has the disadvantage of premature wear and tear.

The purpose of this invention is to eliminate the above-mentioned drawbacks and to provide a disc brake that is simple in structure, has excellent durability, and is compact.

Hereinafter, the configuration of this invention will be explained based on embodiments shown in the accompanying drawings.

As shown in FIGS. 1 to 3, the disc brake of this invention is a floating type disc brake that is slidably attached to a support part, and includes a caliper 1 and a pair of parts facing each other with a disc in between. door assemblies 10, 10';
It consists of a brake piston 20 that presses against the cylinder side pad assembly. In addition, D in the figure
indicates a disk.

The caliper 1 includes a cylinder portion 2, a bridge portion 3 that is connected to the cylinder portion and opens at the center in the circumferential direction of the disk and spans the outer periphery of the disk, and an arm 4 that is connected to the bridge portion and faces the cylinder portion 2. The wheel side pad assembly 1
0' is adapted to be pressed by the arm 4.

A guide pin 5 is inserted into the center of the cylinder part 2 in parallel to the axial direction of the piston 20, and the pad assemblies 10, 10' can be slid onto this pin 5, spanning the opening of the bridge part. installed on. Further, the guide pin 5 is prevented from coming off with a split pin or the like.

The pad assemblies 10, 10' have the same shape, and pin insertion holes 12, 12' are provided at the upper center of the back metals 11, 11', respectively, and the guide pin 5 is inserted into these holes 12, 12'. It is supported to prevent it from falling off. In addition, pin insertion hole 1
2 and 12' are elongated holes, and both sides 13 and 13' of the pad backing plate are used to provide flexibility in the circumferential direction of the disk between the pin 5 and the pin 5.
and the torque receiving surface 7 formed in the opening of the bridge portion opposite thereto.

The pad back metals 11, 11' have both ends extending above the disk insertion groove 6 of the caliper 1, and when braking, only the upper portions facing into the openings of the caliper pubs on both sides 13, 13', respectively, are exposed. Only the part indicated by A in FIG. It will be done. In other words, if the disc is rotating clockwise in FIG. 3, the transmission of braking torque in the brake of the present application is between the lower end of the right side A of the two parts A and the upper end of the left A part. It is done by. pad assembly 10,
10' comes into sliding contact with the disk, the pin 5 acts as a rotational fulcrum and generates a force that rotates the pad assembly in the counterclockwise direction.Next, this rotation causes the extension part on the right to move to part A on the right in the figure. When they touch each other, the pad assembly receives a rotational force from the disk closer to the disk center than the A part, so its rotational fulcrum moves to the lower end of the A part on the right, and as a result, the extension part on the left side of the figure also rotates counterclockwise. This is because it rotates and comes into contact with the left side A part, so that torque can be transmitted only by the A part. Furthermore, since the rotation of the pad assembly during braking is performed within the above-mentioned flexible range of the pin insertion holes 12, 12',
No force perpendicular to the pin axis is transmitted from the pad assembly during braking. Therefore, it is now possible to omit the guide groove of the cylinder part, which was conventionally provided in the part B in FIG. , Also, by eliminating the transmission of braking torque to the guide pin 5, the pin is worn out.
It can also protect against fatigue.

The disc brake of this invention has the above structure, and the braking torque applied to the pad assembly is received only by the bridge part of the caliper, so the length of the caliper piston in the axial direction can be shortened, and the guide pin All you need is one thin disc brake, making the disc brake more compact. Furthermore, the structure is simplified and maintenance and manufacturing are facilitated. In addition, the pad assemblies on the cylinder side and the wheel side can have the same shape, which improves productivity and reduces costs.In addition, braking torque is transmitted to the caliper via a guide pin, which reduces torque transmission. Since it can cover a wide surface area, it has many advantages such as improved durability, and is particularly suitable as a disc brake for two-wheeled vehicles.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of this invention;
FIG. 2 is a cross-sectional view taken along the - line same as above, and FIG. 3 is a cross-sectional view similarly taken along the - line. 1... Caliper, 2... Cylinder part, 3... Bridge part, 4... Arm, 5... Guide pin, 6
...Disc insertion groove, 7...Torque receiving surface, 1
0,10'...Pad assembly, 11,11'...
...Padded back metal, 12, 12'...Pin insertion hole, 1
3, 13'... Side, 20... Brake piston,
D...disc.

Claims (1)

[Scope of utility model registration request] The caliper has an approximately square opening in the center of the bridge part that spans the outer circumference of the disk, with surfaces facing in the circumferential direction of the disk. In an open-top type disc brake, a pair of pad assemblies having a width in the disc axial direction that is slightly smaller than the opening in the disc axial direction are arranged facing each other in the center, and are supported so as to be slidable in the disc axial direction. Forming extensions extending outward in the disk radial direction from the disk insertion groove on both the rotation side and the rotation side of the disk, and making the extension portions face into the opening communicating with the disk insertion groove, The sum of the distances from the sides of the two extensions to the opposing surfaces of the openings facing each side is the flexibility in the disk circumferential direction created between the guide pin and the hole in the pad assembly through which it passes. Further, the number of the guide pins is one, and the guide pin is positioned at the center of the opening in the circumferential direction of the disk outside the disk insertion groove in the disk radial direction, so that the braking torque is transmitted from the pad assembly to the caliper. A disc brake characterized in that the brake is applied only between a side surface of the extension of the backing metal located outside the outer periphery of the disc and a facing surface of the opening.