JPS62289458A - Stamping type parking brake - Google Patents

Abstract

PURPOSE:To have stable braking and its release by allowing a swing arm to rotate with stamping of a pedal, restraining return of the arm by means of meshing of a pawl with ratchet, and holding the braked condition with pulling of a brake cable. CONSTITUTION:When a pedal 35 is stamped, a swing arm 30 rotates clockwise round a pivot 31, and a pawl element 37 of a pawl member 36 moves striding over teeth 53 of a ratchet 50 to cause generation of braking force through pulling of a brake cable C. If foot is removed from the pedal 53, said ratchet 50 is restrained unrotatable by a decelerative mechanism built in a motor unit 40, and the swing arm 30 is held in the brake position. To release brakes, on the other hand, current is supplied to the motor unit 40 to rotate the utput shaft counterclockwise. This allows the swing arm 30 and ratchet 50 to rotate as in a single body counterclockwise without causing relative displacement of the teeth 53 and pawl element 37, and brakes are released with slack of the brake cable C.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention "Industrial Application Field" The present invention is characterized in that the base of a swinging arm is pivotally supported on a base fixed to a vehicle body, and a plate is attached to the base of the swinging arm. This invention relates to a foot-operated parking brake device in which the cables are connected, the distal end thereof extends below the foot, and a foot pedal is provided at the distal end.

"Prior Art" A conventional foot-operated parking brake device is generally as shown in FIG.

That is, the base 2 of the swing arm 1 is pivotally supported by the pivot 1a, a sector 3 centered on the pivot 1a is formed on the base 2 of the swing arm 1, and a brake cable is connected to one end of the base 2. Foot pedal 4 at the tip extending to the bottom of the foot
A claw member 5 facing the sector 3 and swingably supported by a pivot shaft 5a is disposed, and the claw member 5 is engaged with the sector 3.

If we look at the meshing state in detail, as shown in FIG. a (the tangential direction of an arc centered on the pivot 5a) and the tooth surface 3a form an angle A, and the relationship between the tip 5b and the tooth surface 3a reduces the braking load on the swinging arm 1 and the release of the claw member 5. power is greatly affected.

The braking load of the swing arm l is W, the release force of the claw member 5 is P,
If B is the coefficient of friction between the tip 5b and the tooth surface 3a, and L is the total lever ratio of each member, the following relationship is required.

Recently, it has been proposed to use an actuator to release the parking brake, and in this case, it is necessary to reduce the release force P.

"Problems to be Solved by the Invention" However, in such conventional foot-operated parking brake devices, when releasing the parking brake using an actuator, the releasing force P must be minimized or a powerful actuator is required. This results in increased size, weight, and high cost.

Therefore, considering the above equation (1), the coefficient of friction B is about 0.1 to 0.2 from the viewpoint of the material, so it is most effective to reduce the lever ratio. As the parts become larger and the amount of movement increases,
There is a problem in that the layout of the device becomes extremely difficult.

Further, since it is essential that the protruding end 5b of the claw member 5 and the tooth surface 3a of the sector 3 slide, there are problems in that wear is unavoidable and the impact is large when the mesh is disengaged.

The present invention has been made in view of these conventional problems, and an object of the present invention is to provide a foot-operated parking brake device that solves these problems by fundamentally changing the concept of how to release the brake. It is said that

"Means for Solving the Problems" The gist of the present invention for achieving the above object is to provide a base of a swinging arm that is pivotally supported on a base that is fixed to the vehicle body, and a brake on the base of the swinging arm. While connecting cables,
In a foot-operated parking brake device whose tip extends below the foot and is provided with a foot pedal, a windmill connected to a motor via a deceleration mechanism is attached to the base concentrically with the axis of the swing arm; The foot-operated parking brake device is characterized in that the swing arm is provided with a pawl member that engages with the windmill.

``Function'' However, when the foot pedal is pressed, the swinging arm rotates,
The claw of the claw member climbs over the fixed teeth of the windmill. In the return direction, the swinging arm is restrained by the claw members meshing with the teeth of the windmill, and the brake cable is tightened to perform braking, and the braking state is maintained.

To release the brake, start the motor and rotate the windmill in the direction in which the swing arm returns. The claw member and the swing arm rotate together with the windmill and return to the brake release position. Since the pawl member and the windmill are only displaced and engaged with each other during braking operation, almost no wear or impact occurs.

"Example" Hereinafter, one embodiment of the present invention will be described based on an open view.

1 and 2 show one embodiment of the invention.

The foot-operated parking brake device 10 includes a base 32 of a swinging arm 30 that is pivotally supported via a pivot 31 on a base 20 that is fixed to the vehicle body. A brake cable C is connected thereto.

A pivot bracket 21 is fixed to one side of the base 20,
The end portion 22 extends to a pivot shaft 31 of the swing arm 30, a bushing 24 is fitted into a burring portion 23 formed at the end portion 22, and the pivot shaft 31 is pivotally supported by the pivot bracket 21 via the bushing 24. There is.

An arm portion 34 extends downward from the pivot 31 of the swing arm 30, and a foot pedal 35 is provided at the tip thereof.

The base 20 has a motor unit, and the housing 4 of the t40
1 is fixed by mounting legs 42.42 and screws 43.43, a motor and a reduction mechanism are built in the housing 41 of the motor unit 40, and an output shaft 44 from the reduction mechanism is connected to the swing arm 30. It extends concentrically to the axis 31.

A worm mechanism is adopted as the deceleration mechanism, and the mounting leg 42
．． The pivot bracket 21 of the base 20 is collinear with the screw 43.

A windmill 50 is fixed to the output shaft 44 of the motor unit 40, and the pivot 31 of the swing arm 30 is connected to the center hole 51 of the windmill 50.
It is rotatably connected to via a bush 52.

A pawl member 36 facing the teeth 53 of the windmill 50 is pivotally supported via a pivot pin 36a provided upright on the arm portion 34 of the swing arm 30, and the engaging pawl 37 of the pawl member 36 can be climbed over during braking operation. The teeth 53 of the windmill 50 are locked when returning.
It meshes with the

The claw member 36 is biased by a spring 38 in a direction in which the engaging claw 37 comes into contact with the teeth 53 of the windmill 50 .

A detection switch 25 that detects the arm portion 34 of the swing arm 30 in the brake release position (solid line in Figure 1) is fixed to the base 20, and the detection end 25a of the detection switch 25 faces the edge of the arm portion 34. There is.

Next, the action will be explained.

The solid line in FIG. 1 indicates that the foot-operated parking brake device 10 is in the brake release state, the swing arm 30 is in the brake release position where it has fully rotated in the direction of the half-hour hand, and the windmill 50 is a deceleration device built into the motor unit 740. It is restrained in a stopped state by a mechanism.

When the foot pedal 35 is stepped on, the swing arm 30 rotates clockwise about the pivot 31, and the engaging claw 37 of the claw member 36 moves over the teeth 53 of the windmill 50. The brake cable C is pulled by the operating end 33 to generate braking force.

When the foot pedal 35 is fully depressed and the foot pedal 35 is released, the windmill 50 is restrained from rotating by the deceleration mechanism built into the motor unit 40, and the engaging claw 37 of the claw member 36 is rotated in the return direction by the teeth 53 of the windmill 50. Since the swing arm 30 cannot be overcome, the swing arm 30 is restrained in the braking position.

When the brake is released, the motor built in the motor unit 40 is energized and activated so that the output shaft 44 rotates in the direction of the half-hour hand in FIG. Wind turbine 50 by output shaft 44
also rotates in the direction of the half-hour hand.

There is almost no shock at startup.

Since the swinging arm 30 receives a braking reaction force from the brake cable C, when the windmill 50 rotates in the direction of the half-hour hand,
The swinging arm 30 also rotates in the direction of the half-hour hand, and the swinging arm 30
The windmill 50 and the windmill 50 rotate integrally in the direction of the half-hour hand without causing any relative displacement between the teeth 53 and the engagement pawl 37, and the braking is released when the brake cable C is loosened.

At the brake release position, the edge of the arm portion 34 of the swinging arm 30 pushes the detection end 25a of the detection switch 25, and the power to the motor built in the motor unit 40 is cut off. stops, and although the engagement position between the teeth 53 of the windmill 50 and the engagement pawl 37 is different from the above, the foot-operated parking brake device 10 is in the same brake release state.

In the above embodiment, the deceleration mechanism is described as a worm mechanism which itself has a restraint function, but the deceleration mechanism itself may have no restraint function, and a brake may be provided at the starting end of the deceleration mechanism. Further, the motor is not limited to an electric motor, and may be a hydraulic motor or the like.

"Effects of the Invention" According to the foot-operated parking brake device according to the present invention, the release force from the braking state is hardly a problem, and there is no impact, no parts that wear out, and the operation is extremely stable. This makes it possible to create a foot-operated parking brake device that is durable and quiet.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
Figure 1 is a front view of the foot-operated parking brake device:
Similarly, FIG. 52 is a longitudinal sectional view, and FIGS. 3 and 4 are explanatory views of the conventional example. 10... Foot-operated parking brake device 20...
Base 21... Pivot bracket 30...
Swing arm 31... Pivot 32... Base
33... Operating end 34... Arm part 3
5... Foot pedal 36... Claw member 37
...Engagement claw 40...Motor unit 44...Output shaft Fig. 3 Fig. 4

Claims (1)

[Claims] A base of a swing arm is pivotally supported on a base fixed to a vehicle body, and a brake cable is connected to the base of the swing arm, while a brake cable is connected to the base of the swing arm.
In a foot-operated parking brake device whose tip extends below the foot and is provided with a foot pedal, a ratchet wheel connected to a motor via a deceleration mechanism is attached to the base concentrically with the pivot of the swing arm; A foot-operated parking brake device, wherein the swing arm is provided with a claw member that engages with the ratchet wheel.