SU349195A1 - DISK BRAKE - Google Patents

Description

This invention relates to disc brakes for wheeled vehicles.

Disc brakes are known, comprising a brake disc, brake pads cooperating with its working surfaces, a support bracket with guide surfaces and an axially movable bracket with a driving device and guide fingers installed in the bracket interacting with the guide surfaces of the bracket.

The disadvantage of such brakes is a violation of the clarity of their work due to the biting and wear of the fingers at the point of contact with the guide surfaces of the bracket, as well as the occurrence of unwanted noise and vibrations caused by a loose contact of the fingers with the guide surfaces.

The proposed brake differs from the known ones in that the interaction of the fingers with the guide surfaces of the bracket is carried out by means of bushings freely mounted on the fingers, which have the possibility of limited axial movement relative to the bracket and pressed to the guide surfaces of the bracket by the elastic elements installed on it. stiffness.

and one of the sleeves is loaded by the force of a spring interacting with it, acting in a plane passing through the geometric axes of the sleeves, and the other - by the force of a spring interacting with it, acting perpendicular to the specified plane.

In order to reduce wear on the fingers, it is desirable that at both ends of the sleeves, seals are associated with the fingers.

With this arrangement, the vibrations and finger biting in the guide surfaces are eliminated.

FIG. 1 shows the brake, front view;

in fig. 2 is a section along the AL in FIG. one; on

FIG. 3-brake, rear view; pas figs. 4 - section

according to BB in FIG. one.

The disk / brakes are mounted on the hub 2 of the wheel rotating around the trunnion 3, with which the support bracket 4 of the brake is rigidly connected. Floating bracket 5 covers the peripheral part of the disk and rests on guide cylindrical surfaces 6, 7 of protrusions 8.9

bracket through parallel to the axis of the disk sleeves 10, freely mounted on the guide pins 11.

The fingers are installed in coaxial holes 12, 13 of the bracket and fixed in them. The length of the sleeves is chosen to be somewhat shorter than the inner end surfaces 15, 16 of the bracket, so as to limit their reciprocal movement within the gaps a and b defined by the necessary workers. staples and admissible axial deformations of the disk.

The bracket 4 screws 17 attached tared lamellar springs 18, 19, the free ends of which interact with the sleeves 10. The spring 19 is bent so that it loads the sleeve in contact with it in the plane in which the geometric axes of the sleeves lie and the spring 18 in contact with it bushing with a force acting perpendicular to said plane.

Since the radii of the supporting surfaces 6, 7 should be somewhat larger than the radius of the sleeves (for reasons of assembling the assembly and allowing the sleeves to move relative to the bracket), the bracket under the action of the springs 18, 19 is set so that radial in and side g gaps between the surface 6 and the with her sleeve. The free end of the spring 18 is made of fork and covers the edge of the bracket.

In the bracket is mounted hydraulic driven cylinder 20 with a piston 21, which interacts with the primary brake pad 22. Opposite from the cylinder, the shoulder 23 of the bracket carries the secondary block 24.

The cuff cuff 25 covers the piston 21 tight enough to properly hold the pads in light contact with the disc, thereby fulfilling the functions of an automatic brake clearance regulator.

When a pressurized fluid from the brake master cylinder into the cavity of the cylinder, the piston presses the pad 22 against the disc, and the reactive counter movement of the clevis - pad 24. Since the sleeves are pressed against the surfaces 6, 7 by springs, with normal (i.e. within clearances a and b) the clevis moves the fingers move in the bushings held by friction forces on the surface 6, 7. The stiffness of the springs is chosen enough to avoid the occurrence of vibrations and cracking of the clevis but not enough to prevent the movement of the bushings relative to the base in either direction in the selection brace clearances and used or due to wear of the friction linings, or because of the so-called kickback from the disk. Such impacts are the result of excessive axial deformation of the disk, which is formed during sudden 5 axial loads on the wheel.

Due to the use of sleeves as intermediates between the fingers and the bracket, the specific pressure on the fingers and their wear, as well as the ability to bite them on the gripping surfaces due to distortions and scuffing, are reduced.

To further improve the working conditions of the fingers, sealing cuffs 26 are mounted in the sleeves, preferably

5 of the rolling-in type, i.e., with work surfaces not moving relative to the surface of the fingers, and the cavities of the sleeves between the cups are filled with grease during assembly.

Subject invention

Claims (3)

1. A disk brake comprising a brake disk, brake pads cooperating with its working surfaces, a support bracket with guide surfaces and an axially mounted bracket with a drive device and guide fingers installed in the bracket interacting with the guide surfaces of the bracket characterized in that, in order to eliminate vibrations and biting of fingers in guide surfaces, their interaction is carried out with the help of loosely installed fingers on the fingers, which may There is a limited axial movement relative to the bracket and pressed against the guide surfaces of the bracket by means of elastic elements mounted on it with a predetermined stiffness. 2. A brake according to claim 1, characterized in that the elastic elements are made in the form of plate springs, one of the sleeves being loaded by a force of a spring interacting with it, acting in a plane passing the geometric axes of the sleeves, acting perpendicular to the indicated plane. 3. Brake on PP. 1 and 2, characterized in that, in order to reduce the wear of the fingers, seals interacting with the fingers are installed at both ends of the sleeves.