JP2538970B2 - Brake clearance adjustment device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a brake clearance adjusting device applied to a brake for a railway vehicle or the like.

[Conventional technology]

FIG. 3 shows a sectional view of a conventional brake clearance adjusting device. In the figure, 1 is a main lever, 2 is a pin attached to a fixed portion and supporting the main lever 1, and the main lever 1 can swing about the pin as a fulcrum. Reference numeral 3 denotes a sleeve having an internal thread, and 4 denotes a brake push rod having an external thread connected to an internal thread of the sleeve, which has a function of pressing a brake (not shown). 5
Is a spherical bush attached to the outer surface of the sleeve and is engaged with the lower end of the main lever 1. In FIG. 3 (b),
When the main lever 1 is swung counterclockwise to operate the brake device, the movement of the lower end of the main lever is transmitted to the sleeve 3 via the bush 5, and the push rod 4 connected to the sleeve 3 moves to the right. Move to and press the brake. It is a ratchet that is fitted in the sleeve 3 and the sleeve 3
It is designed to rotate around its axis.
However, the push rod 4 is constrained from rotating even if the sleeve 3 rotates, and when the sleeve 3 rotates, the push rod 4 moves in the axial direction by the action of the screw between them. Reference numeral 7 is a thrust adjuster ring attached to the sleeve 3. However, even if the sleeve 3 rotates, the thrust adjuster ring 7 is constrained so as not to rotate. Reference numeral 8 is a pin attached to the thrust adjuster ring 7. 9 is the thrust adjuster ring 7
It is a shaft incorporated in the and can be moved up and down. 10 is a claw, 11 is a link, and when the shaft 9 moves up and down, the movement is transmitted to the claw 10 by the link 11 having the pin 8 as a fulcrum, and the claw 10 moves up and down. 12 claws
It is a spring stretched between 10 and the thrust adjuster ring 7, and when the shaft 9 is not under force, the pawl 10
Is being lowered. The spring 12 further functions to press the tip of the pawl 10 against the tooth surface of the ratchet 6. 13 is a roller provided at the upper end of the shaft 9, 14 is a main lever 1
It is a detection lever attached to. When the detection lever 14 pushes down the shaft 9 via the roller 13 by swinging the main lever 1, the action of the link 11 pulls the pawl 10 upward.

FIG. 4 shows a state in which the main lever 1 is swung counterclockwise around the pin 2 as a fulcrum in order to operate the brake device in the above device. At this time, the detection lever 14
Pushes down the shaft 9 via the roller 13, and accordingly the link 11 rotates clockwise around the pin 8 as a fulcrum in FIG. 3 (a), and pulls up the pawl 10 against the force of the spring 12. The illustrated state shows that the tip of the pawl 10 has passed over one of the teeth of the ratchet. Spring 9 pawl 10
Is pressed against the tooth surface of the ratchet 6. The above is the state of FIG.

From the above-mentioned state, when the main lever oscillates clockwise and returns to the state shown in FIG. 3, the pawl 10 moves downward by the force of the spring 12 while being caught by the teeth of the ratchet 6, and the ratchet 6 Rotates the sleeve 3 counterclockwise in FIG. 3 (a) by an angle of one tooth. The push rod 4 which is restrained from rotating is caused by the action of the screw between the push rod 4 and the sleeve 3.
Is extruded from the sleeve 3 by an amount corresponding to the rotation of the.

In the conventional clearance adjusting device, according to the above principle, the movement amount of the push rod 4 increases due to the abrasion of the friction surface of the braking device, and the swing angle of the main lever 1 increases accordingly, and the detection is performed. When the pawl 10 gets over the teeth of the ratchet 6 by the action of the lever 14, the sleeve 6 rotates and the push rod 4 is pushed out, whereby the clearance set value of the friction surface of the brake device is automatically adjusted. It

[Problems to be Solved by the Invention] In the conventional device, the brake gap when the brake is not operated, that is, the gap setting value is determined by the gap between the detection lever 14 and the roller 13 when the brake is not operated. . However, when the gap adjustment is repeated and the pushing amount of the push rod 4 with respect to the sleeve 3 increases, the vertical position of the tip end portion of the push rod 4 changes due to restraint of a hanger or the like (not shown), and as a result, the sleeve 3 Since the relative inclinations of the thrust adjuster ring 7 and the shaft shaft 9 with respect to the main lever 1 are changed, the position of the roller 13 with respect to the detection lever 14 is changed and the gap is also changed. That is, the conventional technique has a drawback that the gap setting value changes as the gap adjusting action is repeated.

The present invention is intended to prevent the gap setting value from changing even if the gap adjusting operation is repeated.

[Means for solving the problem]

The present invention has solved the above-mentioned problems and has a sleeve rotatable around an axis having an internal ratchet and a spherical bush engaging with a main lever and having an internal thread, and an external thread. A brake push rod, which is connected to the sleeve through which rotation about an axis is suppressed, is provided, and a pawl that moves in response to a change in the gap between the brake friction surfaces detected by the brake gap detection unit is provided on the ratchet. In a brake gap adjusting device for hooking and rotating the sleeve to push out a brake push rod to adjust a gap, a brake gap detecting portion is provided at a central portion of the spherical bush when viewed from a direction perpendicular to a swing surface of the main lever. The present invention relates to a brake gap adjusting device, which is provided so as to be positioned and a stopper which faces the detecting portion is provided on a fixed portion.

[Action]

In the device of the present invention, since the gap detecting portion and the stopper corresponding thereto are provided at the positions that are not affected by the inclination of the sleeve, the gap adjusting action is repeated and the sleeve is inclined due to the restraint of the hanger or the like. However, a constant gap setting value can always be maintained.

〔Example〕

FIG. 1 shows a sectional view of an embodiment of the present invention. Code 1
The parts denoted by 8 and 10 to 12 have the same functions and structures as those of the prior art shown in FIG. The shaft 9 has the same function as in the prior art, but the structures at both ends are different.

In FIG. 1, 15 is a detection lever, 16 is a pin attached to the thrust adjuster ring 7, and the detection lever 15
Is rotatably supported at its central portion. A long hole is provided at one end of the detection lever 15, and the lower end of the shaft 9 penetrates into the long hole. 17 is the lower end of the shaft 9 and the detection lever 15
In the state of FIG. 1 in which the brake is not operated, the lower end of the detection lever 15 is pushed up by the action of the spring 12. 18 is the detection lever 15
A roller as a clearance detecting portion provided at the upper end of the spherical lever 5 and at the central portion of the spherical bush 5 when viewed from the direction perpendicular to the swing surface of the main lever 1 as shown in FIG. Is a stopper attached to a fixed portion (not shown) of the present apparatus. That is, the roller 18 and the stopper 19 as the gap detecting portion are provided at positions that are not affected by the inclination of the sleeve 3 due to the change in the vertical position of the tip of the push rod 4.

FIG. 2 shows a state in which the main lever 1 is swung counterclockwise around the pin 2 as a fulcrum in order to apply a brake in the apparatus of this embodiment. At this time, the sleeve 3 moves to the right through the spherical bush 5 in FIG. 2 (b). The thrust adjuster ring 7 and the detection lever 15 connected to the sleeve 3 also move to the right accordingly.
When the friction surface of the brake is worn and the strokes of the push rod 4 and the sleeve 3 are larger than usual, the roller 18 attached to the tip of the detection lever 15 comes into contact with the stopper 19 attached to the fixed portion, and the roller 18 is attached. Trying to stop the movement of 13 to the right. When the sleeve adjuster ring 7 moves further to the right along with the sleeve 3, the roller 18 constrained by the stopper 19 moves upward, and the detection lever 15 uses the pin 16 as a fulcrum to resist the force of the spring 12. Then, it rotates counterclockwise. At this time, the detection lever 15 pulls down the shaft 9 via the roller 17. When the shaft 9 is pulled down, the link 11 rotates clockwise around the pin 8 as a fulcrum, and the pawl 10
Pull up. Since the tip of the pawl 10 is pressed against the tooth surface of the ratchet 6 by the spring 12, the pawl 10 moves while sliding on the tooth surface of the ratchet 6 and is caught by the tooth when the tooth of the ratchet 6 is crossed over. FIG. 2 shows a state in which the tip of the pawl 10 gets over one of the teeth of the ratchet 6 because the wear of the braking surface is great. The above is the state of FIG. From this state, when the main lever 1 is swung clockwise and returned to the state shown in FIG. 1, the pawl 10 moves downward by the force of the spring 12 while being caught by the teeth of the ratchet 6, and the ratchet 6 Rotates to rotate the sleeve 3 counterclockwise in FIG. 1 (a). The push rod 4 whose rotation is restrained is pushed out of the sleeve 3 by the action of the screw between the push rod 4 and the sleeve 3, and the clearance setting value of the friction surface of the brake device is automatically adjusted.

In the present embodiment, the gap adjusting operation described above is repeated, and the pushing amount of the push rod 4 with respect to the sleeve 3 increases, and the vertical position of the tip end portion of the push rod 4 is increased by restraint of a hanger (not shown). Even if the inclination of the sleeve 3 or the like changes, the roller 18 of the gap detecting portion is positioned at the center of the spherical bush 5 as viewed from the direction perpendicular to the swing surface of the main lever 1 so as not to be affected by the inclination of the sleeve 3. Provided, and again,
Since the stopper 19 is also attached to the fixed portion that is not affected by the inclination of the sleeve 3, the positional relationship between the roller 18 and the stopper 19 is always kept the same when the brake is not operated. The gap setting value can be kept constant.

〔The invention's effect〕

In the present invention, since the gap detecting portion for detecting the gap of the brake and the stopper which is opposed to the gap detecting portion are provided at the position not affected by the inclination of the sleeve, the wear of the brake progresses and the brake gap adjusting action is repeated. Even if the vertical position of the tip of the brake push rod changes and the inclination of the sleeve changes, a constant brake gap setting value can be maintained.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is an operation explanatory view of the above-mentioned embodiment, FIG. 3 is a sectional view of a prior art, and FIG. In all of these figures, (a) is a front view and (b) is a side view. 1 ... Main lever, 2 ... Pin, 3 ... Sleeve, 4 ... Brake push rod, 5 ... Spherical bush, 6 ... Ratchet, 7 ... Slack adjuster ring, 8 ... Pin, 9 ... Shaft, 10 ... Claw, 11 ... Link, 12 ... Spring, 13 ... Roller, 14 ... Detection lever, 15 ... Detection lever, 16 ... Pin, 17 ... Roller, 18 ... Roller, 19 ...... Stopper.

Claims (1)

(57) [Claims] 1. A sleeve rotatable around an axis having a ratchet on the outside and a spherical bush for engaging with a main lever and having an internal thread inside, and a sleeve having an external thread connected to the sleeve via the male thread. And a brake push rod whose rotation around the axis is suppressed, and a pawl that moves according to a change in the gap between the brake friction surfaces detected by the brake gap detection unit is hooked on the ratchet to rotate the sleeve. In a brake clearance adjusting device for adjusting a clearance by pushing out a brake push rod, a brake clearance detecting unit is provided so as to be located at a central portion of the spherical bush when viewed from a direction perpendicular to a swing surface of the main lever, and the same detection A brake clearance adjusting device characterized in that a stopper which is opposed to the stopper is provided in a fixed portion.