JPH0651464B2 - Brake device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of use" The present invention pivotally supports a brake lever on a support bracket,
The end portion of the control cable connected to the braking portion is wound around the winding guide portion provided around the pivot axis of the brake lever to fix the end, and when the brake lever is swung, the winding guide portion is attached to the winding guide portion. The present invention relates to a brake device in which a control cable is wound to apply a brake.

"Prior art" In the conventional braking device, the winding guide part, which is provided around the pivot of the brake lever and is wound around the end of the control cable connected to the braking part, has a radius of the winding part. Is kept constant or the radius is reduced with the intention of increasing the braking force in the end, and as the brake lever depression angle (rotation angle) increases as indicated by lines ac in FIG. Generally, the lever ratio is large, and when the brake lever is rotated sufficiently to maximize the braking force, the change in the stepping load is small with respect to the change in the stepping angle of the brake lever. Met.

[Problems to be Solved by the Invention] However, in such a conventional braking device, when the braking force is maximum, the operating load does not change much even if the brake lever is moved a little, and the braking force reaches the maximum. However, there is a problem that it is difficult to control the braking force by the brake lever and only simple control of turning the brake on or off can be performed.

The present invention has been made in view of the above problems of the conventional technique, and an object thereof is to provide a brake device that is easily controlled by a brake lever even when the braking force reaches a maximum. There is.

"Means for Solving the Problem" The gist of the present invention for achieving such an object is that a brake lever is pivotally supported on a support bracket, and a winding guide portion provided around the pivot shaft of the brake lever is provided. In the brake device, the end of the control cable connected to the braking part is wound around to fix the end, and when the brake lever is swung, the control cable is wound around the winding guide part to apply the brake, In the braking device, the radius of the winding guide portion is set such that the radius in the middle period is smaller than the radius in the initial period when the brake is applied, and the radius is increased in the final stage with respect to the middle period.

To do.

[Operation] When the brake lever is swung, the control cable is wound or unwound to the winding guide portion, and when it is wound, the braking portion is braked. Brake In the early stage of applying the brake lever, quick braking can be started with a small lever ratio with a large radius, and the radius in the next medium term has been made small, so a large lever ratio does not increase the operating force and a large control is possible. You can get power.

The radius of the winding guide part is set to gradually increase at the end of braking, so when the braking force reaches the maximum, the change in the operating load should be relatively large with respect to the change in the rotation angle of the brake lever. Therefore, the braking force can be changed by changing the rotation angle of the brake lever.

Therefore, it becomes possible to easily control the braking state by the brake lever.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

This embodiment is a foot-operated parking brake device 10. The parking brake device 10 includes a support bracket 11 fixedly installed by a mounting bolt 12 near the floor of the vehicle.
Brake lever 13 for pivoting pivotally
And a pawl member 17 that holds the braking force by meshing with a locking tooth 15a of a pawl wheel 15 that is fixedly provided on the brake lever 13, and a swing end 17b of the pawl member 17 is pressed against the tail portion. A release arm 30 for connecting the release cable 40 to the vicinity of the front end provided with a pressing member 34, and a rear end portion of the release arm 40 attached to the brake lever 13 and wound around a winding guide portion 24 fixed to the brake lever 13. And a control cable 25 for transmitting the braking force.

A pedal 14 having a tread surface 14a directed toward the operator's leg is fixedly provided at the tip of the brake lever 13.
A winding guide portion 24 of the control cable 25 is formed so as to surround 6 and a locking tooth 15a of the ratchet wheel 15 is similarly engraved around the pivot shaft 16.

A claw member 17 having a claw 18 that engages with the ratchet wheel 15 is rotatably supported by a pivot shaft 19 of the claw member, and a swinging end 17b of an elongated arm 17a is pushed by a pusher of a release arm 30. 34 is facing. Further, a spring 20 is attached to an end portion 17c of the claw member on the opposite side of the arm 17a so that the claw 18 of the claw member 17 is constantly biased to the side that meshes with the engaging tooth 15a of the claw wheel 15.

The radius of the winding guide portion 24 decreases from the initial radius R1 when the brake is applied to the radius R2 from the intermediate period to the latter period, and becomes a large radius R3 at the final stage, and gradually increases at the final stage. It is set.

The winding guide portion 24 changes, for example, as shown by a line d or a line e, as shown in FIG. 3 showing the relationship between the depression angle of the brake lever 13 and the lever ratio.

The release arm 30 is swingably supported by a pivot shaft 35 of the release arm, and a pusher 34 is fixed to the swinging tail end 33. The pusher 34 is opposite to the pusher 34 with the pivot shaft 35 interposed therebetween. The tip of the release cable 40 is fastened to the fastening point 32 at the position.

The control cable 25 has one end fastened to the brake lever 13, and the winding guide portion 2 of the control cable 25.
It is wound along 4 and is extended along the vehicle body so as to transmit a braking force corresponding to the depression amount of the brake lever 13.

Next, the operation will be described.

When the pedal 14 is stepped on from the state shown in FIG. 1, the brake lever 13 rotates in the clockwise direction in FIG. 1 around the pivot shaft 16 to transmit the braking force corresponding to the stepped amount to the control cable 25. . On the other hand, since the pawl member 17 is constantly biased toward the pawl wheel 15, when the foot is released from the pedal 14, the engaging tooth 15a of the pawl wheel 15 and the pawl 18 of the pawl member 17 mesh with each other at that position. The lever 13 is prevented from returning to the braking state.

In the initial stage of applying the brake, the radius R1 of the winding guide portion 24
Therefore, the lever ratio is relatively small, and the control cable 25 is quickly wound around the winding guide portion 24. From the middle period to the latter period, the radius of the winding guide portion 24 becomes R2 and the lever ratio increases, so that the control cable 25 is strongly wound.

At the end of braking, the radius of the winding guide portion 24 is R
3, the lever ratio decreases again, and the rate of change of the braking force with respect to the rotation angle of the brake lever 13 increases.

In this way, the lever ratio changes in the braking state, the stepping force and the braking force of the brake lever 13 change according to this change, and the braking force is controlled by changing the stepping force of the brake lever 13 in the final stage. You can

As shown in FIG. 2, the manner of this change can be clearly understood by comparing with a line where the lever ratio is constant.

When the release knob provided at the end of the release cable 40 is pulled to release the brake state, the release arm 30 rotates the pawl member 17 in the counterclockwise direction via the pusher 34 while rotating itself in the counterclockwise direction. To the claw member 17
The pawl 18 is disengaged from the locking tooth 15a of the ratchet wheel 15, the ratchet wheel 15 is released, the brake lever 13 is returned, the control cable 25 is loosened, and the brake is released.

Although the above embodiment shows the foot-operated parking brake device, it may be manually operated, and a power-operated brake device is also effective for enhancing the controllability thereof.

[Advantages of the Invention] According to the braking device of the present invention, quick braking can be started in the initial stage of braking, and a large braking force can be obtained in the middle period without increasing the operating force due to the large lever ratio. In the final stage of braking, the control of the braking force becomes easier, the operation feeling is improved as a whole, and the idea is reversed and a remarkable effect is achieved as compared with the conventional technology in which only the strong braking force is pursued. I was able to raise it.

[Brief description of drawings]

FIG. 1 is a front view of a foot-operated parking brake device according to an embodiment of the present invention, and FIG. 2 is a diagram showing a relationship between an operation angle of a brake lever, a lever ratio, and an output stroke.
FIG. 3 is a diagram showing the relationship with the depression angle lever ratio of the brake lever. 10 ... Foot-operated parking brake device 11 ... Support bracket, 13 ... Brake lever 15 ... Claw wheel, 17 ... Claw member 24 ... Winding guide part 25 ... Control cable 30 ... Release arm, 34 ... … Presser 40 …… Release cable

Claims (1)

[Claims] 1. A brake lever is pivotally supported on a support bracket, and an end portion of a control cable connected to a braking portion is wound around a winding guide portion provided around the pivot axis of the brake lever to fix the end portion. In a brake device in which a control cable is wound around the winding guide portion to apply a brake when the brake lever is swung, the radius of the winding guide portion is set to a value in a middle period with respect to an initial radius for applying the brake. A braking device characterized in that the radius is made smaller and the radius is set to be larger at the end of the middle period.