JPH0611365Y2 - Disc brake mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention reduces the operating force of a mechanical brake device arranged in a mission device of a traveling vehicle.

(B) Conventional technology In the conventional disc brake mechanism, the operator rotates the braking cam by the force of rotating the brake arm with his / her foot or hand, and thereby the actuator is rotated to ride the ball on the cam groove. As a result, the actuator was moved forward to press the friction plate.

(C) Problems to be solved by the device However, in the conventional disc brake mechanism, since the force for the operator to operate the brake arm is the braking force as it is, the force required for the braking operation becomes large and the steering force is increased. In the case of a portion such as a braking device that needs to be repeatedly operated during traveling, the operator's fatigue becomes severe due to long-term work.

In order to improve this, as a conventional technique, a hydraulic brake device that brakes by hydraulic pressure is known, but in the case of a hydraulic type, there is a problem that repair inspection becomes complicated and cost increases. Is.

In order to eliminate such a conventional problem, the present invention is a mechanism for operating a mechanically configured brake with a hand or a foot, but it is a servo that can assist the rotational force of a rotating body as a braking side force of the brake. The mechanism is configured to reduce the operating force of the mechanical brake device.

Also, when adopting such a servo mechanism, it is possible to use a normal fixed side friction plate in its original shape,
It is configured by slightly changing the shapes of the brake case and the actuator.

Further, by engaging not only one friction plate but also two or three friction plates and the servo claws 5a, the force acting as an assisting force can be selectively adjusted, and the servo effect can be further enhanced. It is a thing.

(D) Means for Solving the Problems The object of the present invention is as described above, and the configuration for achieving the object will be described below.

The actuator 5 is rotated in one direction by the braking cam 6a, the cam groove 5d is mounted on the ball 3, and the actuator 5 is moved forward to press the plurality of rotation-side and fixed-side friction plates in one direction. In a disc brake device that applies braking to a rotating body that rotates around, a first engagement circle having a width b in which the engagement protrusion 1x of the fixed-side friction plate 1 can be engaged and fitted in the fixed-side brake case 4. The circumferential groove 4d and the second engaging circumferential groove 4c having a width a by which the engaging projection 1x can be slightly rotated are alternately arranged at equal intervals.
Into the second engagement circumferential groove 4c , a servo claw 5a protruding from the actuator 5 and an arbitrary engagement protrusion 1x of the plurality of fixed-side friction plates 1 are fitted and inserted, It is arranged so as to engage with the servo claw 5a when the portion 1x rotates in one direction.

(E) Embodiment The purpose and construction of the present invention are as described above. Next, the construction of the embodiment shown in the accompanying drawings will be described.

FIG. 1 is a rear sectional view of a disc brake device with a servo mechanism, FIG. 2 is a side sectional view of a portion of a brake case 4 and an actuator 5, and FIGS. 3, 4, and 5 show braking of a servo plate 1a. 6 is a side sectional view showing the movement of the disc brake mechanism of the present invention in a disassembled state, and FIG. 7 is a side sectional view showing the positions of the servo groove 4c and the engaging circumferential groove 4d in the brake case 4. It is a figure.

1 and 2, the structure of the essential part of the present invention will be described.

In FIG. 1, only the right side of the left and right steering braking devices is shown. Therefore, the same one as the steering brake device is also arranged on the left side.

A speed change mechanism is configured above the inside of the transmission case, and the rotation after the speed change is generated by the speed change mechanism by the steering shaft 1
4 is transmitted to the center gear 10 above.

The steering clutch gear 25a engraved on the steering clutch body 25 can be meshed with the inner diameter gear portion formed on the left and right of the boss portion of the center gear 10.

Then, slide the steering clutch body 25 left and right,
The steering clutch is disengaged when the steering clutch gear 25a is disengaged from the inner diameter gear of the center gear 10.

The steering clutch body 25 is normally urged by the urging spring 13 on the steering shaft 14 so that the steering clutch gear 25a and the inner diameter gear mesh with each other and the power is transmitted.

In carrying out the present invention, the steering clutch body 25 is
It is a rotating body that gives braking. Then, at the position of the outer end portion of the steering clutch body 25, the rotation-side friction plates 2a, 2
A plate engaging portion 25b for engaging the inner diameter portions of b, 2c, 2d and 2e is configured.

The fixed-side friction plates 1a, 1b, 1c, 1d, and 1e, which are alternately arranged with the rotating-side friction plate 2, are formed with engaging protrusions 1x so as to engage with the brake case 4 side.

The main part of the present invention is configured such that a first engaging circumferential groove 4d having a width b opened by the width d of the engaging protrusion 1x of the fixed side friction plate 1 and a groove having a wide width a are provided. The two engaging circumferential grooves 4c are alternately formed on the end surface of the brake case 4.

The embodiment shown in FIG. 6 includes a brake case 4
Three engaging protrusions 1x are formed on the fixed-side friction plate 1 so as to correspond to the first engaging circumferential grooves 4d formed at three 120 ° intervals. Further, the second engaging circumferential groove 4c is formed at three positions at 120 ° intervals, which are offset from each other by 60 ° with respect to the first engaging circumferential groove 4d.

Therefore, any one of the plurality of fixed-side friction plates 1 engaged with the first engagement circumferential groove 4d can be selectively set to 1
When it is rotationally displaced by 60 ° as shown in a, the three engaging protrusions 1x can be located in the second engaging circumferential groove 4c .

The actuator 5 is fitted and inserted in a donut-shaped groove inside the brake case 4 with the ball 3 being sandwiched between the brake case 4 and the brake case 4.
Is laterally fitted into the opening of the mission case and fixed with bolts.

Then, in the actuator 5, the servo claws 5a are made to face the direction of the fixed side friction plate 1 facing the actuators 5 at intervals of 120 ° or the like in FIG. 6 so as to correspond to the second engaging circumferential grooves 4c . It is formed in several places. And the servo claw 5a
Is projected into the second engagement circumferential groove 4c .

The width a of the second engagement circumferential groove 4c is the width c of the servo claw 5a.
Is slightly larger than the sum of the width d of the engaging protrusion 1x of the fixed-side friction plate 1 and provides a margin for allowing the servo claw 5a, that is, the actuator, to rotate in the braking direction.

A cam shaft 6 having a braking cam 6a engraved therein is loosely fitted in the brake case 4, and the cam shaft 6 and the braking cam 6a are rotated by the rotation of the brake arm 11.

The ball 3 is fitted and sandwiched between the cam groove 4e of the brake case 4 and the cam groove 5d of the actuator 5, and is normally settled at the deepest position of the cam groove 5d. When you rotate the board in one direction, it rides on the shallow groove.
The friction plates 1 and 2 on the fixed side are pressed.

Due to this pressing, the fixed side friction plate 1 is entrained in a direction to rotate in one direction. When the fixed-side friction plate 1a is rotated in one direction, the engagement protrusion 1x and the servo claw 5a are in a second engagement direction so that the engagement protrusion 1x rotates the servo claw 5a in one direction. It is engaged with and disposed in the circumferential groove 4c .

Further, in FIG. 1, the servo claw 5a protruding from the actuator 5 is projected to a position where it engages with the two fixed side friction plates 1a and 1b. It is possible to engage up to 1c.

When only the servo claw 5a and the fixed-side friction plate 1a are engaged with each other, the plate surface that obtains an assisting force from the actuator 5 is only one surface where the fixed-side friction plate 1a contacts one surface of the rotating-side friction plate 2. However, when it is engaged with the two fixed side friction plates 1a and 1b as shown in FIG.
There are three friction surfaces to obtain the assisting force.

Further, the servo claw 5a can be engaged only with the fixed side friction plate 1b without engaging with the fixed side friction plate 1a. In this case, the surface receiving the assisting force is in contact with both right and left sides of the fixed-side friction plate 1b, and thus has two surfaces.

As described above, the assisting force applied to the actuator 5 can be adjusted by arbitrarily changing the number of engaging projections 1x of the plurality of fixed-side friction plates 1 with respect to the servo claws 5a.

(F) Action of the Invention Since the present invention is configured as described above, it operates as follows.

The brake cam 6a is rotated by rotating the brake arm 11, and the brake cam 6a is fitted into the cam engaging portion 5c of the actuator 5, so that the actuator 5 is forcibly rotated in one direction around the circumference. To start.

The ball 3, which has been inserted into the deepest portion of the teardrop-shaped cam groove 5d, rides on the shallow portion.

Since the ball 3 rides on the shallow portion of the cam groove 5d, the brake case 4 is fixed, so that the actuator 5 moves leftward in FIG.

By moving the actuator 5 to the left side, the fixed side friction plate 1 is pushed to generate a frictional state between the fixed side friction plate 1 and the rotating side friction plate 2, and the steering clutch body 25
The rotation of the right wheel or crawler device is stopped.

In this case, a servo, that is, an assisting action is performed with respect to the one-way rotation operation of the actuator 5, and assists the operator to perform braking without applying a large force to the brake arm 11.

That is, as shown in FIGS. 3, 4, and 5, when the brake arm 11 is first rotated, the braking cam 6a of the cam shaft 6 is rotated and the actuator 5 is rotated in the direction of arrow A in FIG. To move.

As a result, the actuator 5 is pushed out by the ball 3 in the direction in which the fixed-side friction plate 1 and the rotating-side friction plate 2 are pressed, and braking is started.

Next, as shown in FIG. 4, since the steering clutch body 25 is still rotating in this state, the rotating side friction plate 2 is rotated, and the fixed side friction plate 1a is rotated as shown by the arrow B. The actuator 5 is rotated along with, and pushes the actuator 5 until it comes into contact with the servo claw 5a of the actuator 5 and the position where the servo claw 5a comes into contact with the engaging protrusion 4b, and rotates in one direction.

The force by which the engaging protrusion 1x pushes the servo claw 5a causes the actuator 5 to rotate in one direction regardless of the braking cam 6a, and the amount by which the cam groove 5d rides on the ball 3 increases.
It becomes the servo power.

(G) Effect of the Invention Since the present invention is configured as described above, it has the following effects.

First, when the fixed-side friction plate 1 is braked, the rotational force when the fixed-side friction plate 1 is rotated together with the rotating body is changed by the actuator 5
Can be used as an assisting force for rotating the cam shaft 6, so that even if the force for rotating the cam shaft 6 by the brake arm 11 is small, the braking can be performed completely, and the steering braking operation can be repeated repeatedly for a long time. Even when doing so, the operator is less tired.

Secondly, when comparing with a normal brake mechanism to which the servo mechanism is not attached, the fixed side friction plate 1 and the rotating side friction plate 2 can use the same parts, and the brake case 4 and the actuator 5 can be used. It is possible to change to a disc brake mechanism with a servo mechanism simply by changing the shape of.

Thirdly, the servo effect can be obtained by projecting the servo claws 5a from the actuator 5 and engaging with the engaging protrusions 1x of the fixed-side friction plate 1 of any number of plural sheets. Therefore, it is possible to easily increase or decrease the number of friction surfaces receiving the assisting force, and it is possible to easily change the servo effect due to the difference in brake capacity.

[Brief description of drawings]

1 is a rear sectional view of a disc brake device with a servo mechanism, FIG. 2 is a side sectional view of a portion of a brake case 4 and an actuator 5, and FIGS. 3, 4, and 5 show braking of a servo plate 1a. 6 is a side sectional view showing the movement of the disc brake mechanism of the present invention, and FIG. 7 is a side sectional view showing the positions of the servo groove 4c and the engaging circumferential groove 4d in the brake case 4. It is a figure. 1 ... Fixed-side friction plate 1a ... Servo plate 1x ... Engagement protrusion 2 ... Rotation-side friction plate 3 ... Ball 4 ... Brake case 4c ... Engagement circumferential groove 4d ... Engagement circumferential groove 5 ... Actuator 5a ... Servo Claw 6 ... Cam shaft 6a ... Brake cam

Claims (1)

[Scope of utility model registration request] 1. A brake cam 6a rotates the actuator 5 in one direction, and the ball 3 rides on a cam groove 5d to move the actuator 5 forward so that a plurality of rotating-side and fixed-side friction plates are moved. In a disc brake device that applies a brake to a rotating body that is pressed to rotate in one direction, the fixed-side brake case 4 has a width b with which the engaging protrusion 1x of the fixed-side friction plate 1 can be engaged and fitted. The first engagement circumferential groove 4d and the second engagement circumferential groove 4c having the width a at which the engagement protrusion 1x is slightly rotatable are alternately arranged at equal intervals, and the second engagement Servo claws 5a protruding from the actuator 5 and arbitrary engaging projections 1x of the plurality of fixed-side friction plates 1 are fitted into the circumferential groove 4c, and the engaging projections 1x are moved in one direction. Servo claw 5 when rotating
A disc brake mechanism arranged so as to engage with a.