KR960009982Y1 - Brake actuator for railway carriage - Google Patents

Abstract

None.

Description

Brake Actuator for Railway Vehicles

1 is a cross-sectional view of the brake actuator according to the present invention.

Figure 2 is a longitudinal sectional view of the brake actuator according to the present invention.

3 is a side view of the brake actuator installed state according to the present invention.

4 is an operating state diagram of the brake actuator according to the present invention

(A) Drawing before the braking operation because the piston and cam do not rise.

(B) is a diagram of a state in which the compressed air flows into the cylinder and the Liston and the cam rise to the top dead center to perform a braking operation.

5 is a longitudinal sectional view schematically showing the structure of a conventional brake actuator equipped with a wedge-shaped operation tool.

* Explanation of symbols for main parts of the drawings

1: Actuator 1a: working surface

2: operation roller 3: sleeve

4: brake shoe 5: piston

5a: packing 6: fixed roller

7: compressed air entrance 8: brake shoe holder

9: Bellows cover A: Brake actuator according to the present invention

10 body 10a side wall

11 cylinder portion 12 compressed air inlet and outlet

13: piston 14: connecting pin

15 bushing 16 camshaft

17: bearing 18: spring

19: fixing pin 20: inner sleeve

22: thrust head 24: forward and backward operating rod

26: roller support shaft 27: outer sleeve

27a: through-hole 27b: first space part

27c: 2nd space part 28: operation roller

29: spring 30: cam

30a: working surface 32: feed nut

33: color 34: bellows cover

35 clutch 36 spring

37: restoring spring 40: brake shoe holder

41: brake shoe 42: wheel

P: Contact point D: Horizontal distance between cam contact point and camshaft

R: radius of curvature of cam working surface N: force on roller

The present invention relates to an actuator for operating a brake for a railway vehicle, and more particularly, to a brake actuator for braking a wheel by actuating a brake by cam motion.

In the conventional brake for a railway vehicle, as shown in FIG. 5, a wedge-shaped actuating tool 1 whose horizontal width generally increases gradually descends and comes into contact with the working surface 1a of the actuating tool 2. ), The brake shoe 4 provided at the front end of the sleeve 3 on which the operation roller 2 is installed advances and brakes by frictionally pressing the wheel.

Such a conventional wedge actuated brake actuator is disclosed in Japanese Patent Publication No. 63-54587, which is applied to the roller 2 as the actuating tool 1 is wedge shaped as shown in FIG. The force (N) does not act in the direction coinciding with the direction in which the brake shoe (4) moves forward and backward, but is pressed in a direction inclined by a predetermined angle with respect to the forward and backward operating direction thereof, so that the horizontal direction thereof. Since only the force (F ') in the reverse operating direction is used to transmit the braking force, the action force of the piston 5 has a disadvantage in that it is not effectively used for wheel braking.

The present invention has been devised to solve the problems of the conventional wedge-type brake actuator, so that the force acting on the piston can be efficiently used for wheel braking, and the contact friction between the roller and the cam acting surface is improved. It is an object of the present invention to provide a brake actuator which minimizes the durability of moving parts.

In order to achieve the above object, the present invention can pivotally install an operation having an arc-shaped action surface at the tip of the piston, and at the same time the action surface is rotatable on the wing shaft of the sleeve coupled to the rear end of the thrust head. It is structured to make rolling contact with the installed roller.

Hereinafter, the brake actuator according to the present invention will be described in detail with reference to the accompanying drawings.

The brake actuator according to the present invention, as shown in Figure 2, the cylinder portion 11 is coupled to the lower end of the body 10, the cylinder portion 11 is inserted into the cylinder portion 11 is installed The piston 13 slides up and down by the force of the compressed air flowing through the compressed air inlet 12 formed in the side wall and is inserted into the body 10 in the horizontal length direction as shown in FIG. The inner sleeve 20 is rotatably installed in the body 10, but does not move in the longitudinal direction, and is screwed into and assembled with a screw formed in the inner diameter of the inner sleeve 20, while the brake is provided at the front end surface. The forward and backward actuating rods 24 to which the thrust heads 22 to which the shoe holders 40 are coupled are coupled, and are fitted to the outer circumferential surface of the inner sleeve 20, and the roller support shaft 26 is radially outer on the outer circumferential surface. Protruding outer sleeve (27) The camshaft is connected to both ends of the connecting pin 14 penetrating the front end of the piston 13 via the bushing 15 so as to be connected to the piston 13 and the rear end penetrates both sides of the body 10. 16) is pivoted about the cam axis 16 by a bearing 17 as a medium, and an arc-shaped action surface 30a is provided at the tip, and this action surface 30a is the roller support shaft. It consists of two cams 30 which are abutted left and right in contact with the outer peripheral surface of the operation roller 28 rotatably inserted in the 26.

In particular, the working surface 30a of the cam 30 has a curvature that gradually increases as the radius R goes downward from the center of the cam shaft 16 where the cam 30 is the center of rotation, as shown in FIG. 3. The cam 30 is rotated in the counterclockwise direction as shown in FIG. 4A by receiving the force of the compressed air through the piston 13, thereby causing the center of rotation of the cam 30 to rotate. Since the horizontal distance (D) to the contact point (P) of the cam 30 and the operation roller (28) gradually increases in the cam 30, the cam (30) and the operation roller (28) by the increased horizontal distance ) And forward and backward actuating rods 24 coupled to the outer sleeve 27 is installed and the outer sleeve 27 is inserted forward.

In addition, the through hole 27a of the outer sleeve 27 has a structure in which the front end of the first space portion 27b having a relatively large diameter and the second space portion 27c having a relatively small diameter are formed coaxially with each other. One end of the transfer nut 32 is inserted between the inner circumferential surface of the second space portion 27c and the outer circumferential surface of the outer sleeve 27, and the other end of the transfer nut 32 is the first space portion ( It is in contact with the rear end of the collar 33 fitted to slide 27b).

The collar 33 is also in contact with the flexible bellows cover 34 provided on the side wall 10a of the body 10 at the front end thereof, and the collar 33 is in contact with the collar 33. The clutch 35 is inserted into the space between the nuts 32 so that the clutch 35 and the transfer nut 32 are driven by the force of the spring 36 elastically installed between the rear end of the clutch 35 and the collar 33. It is in close contact with each other.

And a resilient spring 37 is elastically installed between the operation roller 28 inserted into the roller support shaft 26 of the outer sleeve 27 and the inner surface of the body side wall 10a, the cam 30 is When the operation roller 28 is not pressurized, the rear sleeve 27, the forward and backward actuation rods 24 assembled therewith, and the trust head 22 coupled to the front end of the forward and backward actuation rods 24 are connected to the rear side ( To the left side in FIG.

The operation of the brake actuator according to the present invention having the above structure will be described below.

The brake actuator according to the present invention, as shown in FIG. 3, installs the body 10 adjacent to the wheel at the bottom of the vehicle body. When the brake is to be operated by operating the brake actuator according to the present invention installed as described above, the cylinder part is provided in the state of FIG. 4 (a), that is, through the compressed air inlet 12 provided at the lower end of the body cylinder part 11. (11) When the compressed air is introduced into the cylinder 11 and the piston 13 installed in the cylinder portion 11 is raised at the bottom dead center position, the cam connected to the piston 13 as shown in FIG. 30 is also raised while moving axially around the camshaft 16 and simultaneously presses the operation roller 28 to push the wheel to the right of FIG. 4.

That is, the horizontal distance D from the camshaft 16 to the contact point P, in which the cam operating surface 30a is in contact with the actuating roller 28, gradually increases and actuates the actuated roller 28 by this increased horizontal distance. Is pushed toward the wheel.

Thus, through the outer sleeve 27 is provided with the operation roller 28, the transfer nut 32 assembled to the outer sleeve 27, and the collar 33 in contact with the transfer nut 32, forward and backward As the thrust head 22 coupled to the tip of the operating rod 24 is advanced, the outer circumferential surface of the wheel 42 on which the brake shoe 41 coupled to the thrust head 22 through the brake shoe holder 40 rotates is rotated. Pressurized braking.

In this state, when the brake of the wheel is to be released, the compressed air flowing into the inner space of the cylinder part 11 is removed to remove the force applied to the piston 13. Received by the elastic restoring force of the lower force toward the bottom dead center and the cam 30 coupled to the piston 13 is also lowered while making an axial rotational movement in a clockwise view as shown in FIG.

As the cam 30 pivots and descends as described above, the distance from the cam shaft 16 to the cam operating surface 30a adjacent to the actuating roller 28 decreases by a fold. The actuating roller 28 is operated during the braking operation. The elastic restoring force of the spring 29 compressed by the outer sleeve 27 is transmitted through the outer sleeve 27 and is moved backward while maintaining close contact with the cam action surface 30a. Thus, the thrust head 22 and The brake shoe holder 40 and the brake shoe 41 attached to the holder 40 also retreat and fall from the wheel 42 to release the wheel braking.

The brake actuator according to the present invention, which operates as described above, has a working surface that substantially advances the brake shoe 41 in order to pressurize and brake the rotating wheel 42 by actuating surface 30a in which the curvature gradually changes. Since the cam 30 has a cam, the brake shoe 41 can be advanced at a constant speed to prevent the brake brake from being applied to the wheels, and the force applied to the piston 13 can be effectively applied to the wheel braking. Since the cam 30 operates in rolling contact with the operation roller 28, the frictional force between the operation roller 28 and the cam action surface 30a is minimized, thereby improving the durability of these components. .

Claims (1)

Body 10 and the cylinder portion 11 is coupled to the bottom; A piston 13 inserted into the cylinder part 11 and sliding upward and downward by a force of compressed air flowing through the compressed air inlet and outlet 12 formed on the side wall of the cylinder part 11; An inner sleeve 20 inserted into the body 10 in a horizontal length direction and capable of rotating in the body 10 but not moving in the longitudinal direction; The screw head formed in the inner diameter of the inner sleeve 20 is screwed into the assembly, while the front end is coupled to the thrust head 22 is coupled to the brake shoe holder 40. A reverse operating rod 24; An outer sleeve 27 fitted to the outer circumferential surface of the inner sleeve 20 and having a roller support shaft 26 protruding radially outward from the outer circumferential surface; In the brake actuator for a railway vehicle composed of an operating port (1) coupled to the piston 13, the piston 13 is moved up and down as the piston 13 moves up and down. The fitting port 1 is connected to the piston 13 through the bushing 15 at both ends of the connecting pin 14 penetrating the front end of the piston 13 and connected to the piston 13. The camshaft 16 penetrates both sides of the camshaft 16 through the bearing 17, and pivots around this camshaft 16, and the arc-shaped working surface 30a is provided at the front end, and this working surface 30a is provided. And (2) left and right cams (30) in contact with the outer circumferential surface of the operation roller (28) rotatably inserted into the roller support shaft (26).