JPS62214039A - Releasing mechanism for foot-operated parking brake - Google Patents

Abstract

PURPOSE:To improve controllability of a parking brake, when it is released, while to smoothly actuate the parking brake, by constituting the parking brake such that releasing action of its braking force is performed in a desired speed by an electric motor-driven mechanism. CONSTITUTION:A brake cable 25 is pulled by depressing a brake pedal arm 24 to apply a parking brake, while a ratchet gear 23 is turned in the clockwise direction to bring up a spring against its resilient force thereafter engaged again with a worm gear 27. Accordingly, the brake pedal arm 24, which is not returned even if a foot is separated from the pedal, can hold braking force. Next, a motor 34 is turned by a switch 37 being manually actuated or interlocking to a change lever, causing the brake pedal arm 24 to turn in the counterclockwise direction by rotating the worm gear 27. And for a trouble, generated in power supply and electric circuits, a manual lever 32 is controlled so as to be pulled up. As a result, the brake pedal arm 24 enables its brake holding force to be smoothly further surely generated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a release device for a foot-operated parking brake of an automobile or the like.

Background of the Invention] As a conventional foot-operated parking brake, for example,
There is something like the one shown in the figure. This is ratchet gear 1
The brake pedal arm 2 has a brake pedal arm 2 with There is. Reference numeral 6 denotes a release lever rotatably supported by a support shaft 7, one end of which is brought into contact with the back surface of the ratchet 3, and the other end of which is brought into contact with the release knob 8 for releasing the lock of the ratchet. , are connected via a flexible cable 9. Note that 10 indicates a brake cable, and 11 indicates a warning switch.

Then, when the brake pedal arm 2 is depressed, the brake cable 10 connected to this brake pedal arm 2
is pulled, and at the same time the parking brake is activated,
When the ratchet is moved to a predetermined position by pressing the toe and the foot is released, the ratchet 3 is hooked to the gear 1 and the parking brake is maintained in an activated state. To release this braking force, pull the release knob 8 by hand, and the release lever 6 will rotate in the counterclockwise direction in the drawing with the support shaft 7 as a fulcrum, and as a result, the ratchet 3 will move in the counterclockwise direction in the drawing. Since the brake pedal arm is flipped up, the locking force of the ratchet gear 1 is released, and the brake pedal arm returns to its original position and is released.

However, such conventional foot-operated parking brakes have poor operability because the release knob 8 must be reached to the installation position to operate it. If the release knob 8 is to be installed near the driver in order to improve operability, the flexible cable will have to be long and the link mechanism will become complicated. In addition, with the above conventional structure, when the release knob 8 is pulled, the ratchet 3 suddenly disengages from the gear 1 and the reaction of the pedal is strong, resulting in a large abnormal noise and impact force. Ta.

(Object of the Invention) The present invention has been made by focusing on such conventional problems, and it is possible to release the parking brake force by using an electric mechanism at a desired speed. It is an object of the present invention to provide a release mechanism for a foot-operated parking brake, which improves the operability of the parking brake and smoothes the operation of the parking brake.

[Embodiments of the invention]

The present invention will be explained in detail below based on the embodiments shown in FIGS. 1 to 4.

Reference numeral 21 denotes a box-shaped base frame, and a brake pedal arm 24 having a sawtooth ratchet gear 23 formed in an arc shape is pivotally attached to a support shaft 22 attached to the base frame 21. Further, a brake cable 25 is connected to this brake pedal arm 24 via a connector 26. 27 is a worm gear formed with teeth that mesh with the ratchet gear 23, and one end of the worm gear 27 is connected to a drive shaft 29 rotatably supported by the base frame 21 via a universal joint 28. has been done. Also, a bushing 3 is provided at the other end of the worm gear 27.
0, the worm gear 27 is connected to the ratchet gear 2 through
A spring 31 is provided for biasing in the direction of meshing with 3. Furthermore, at the other end of the worm gear 27,
A manual lever 32 that penetrates and projects from the base frame 21 to the outside is formed as an extension. The through hole 33 of the manual lever 32 provided in the base frame 21 is formed into a long hole in the vertical direction, and the manual lever 32 is movable only in the vertical direction. 34 is a motor for rotating the drive shaft 29, and 35 is a switch for lighting the warning lamp 36. Also, this switch 35 and motor 34
The electrical circuit is shown in FIG. 2, where 37 is a brake release switch that can be closed or manually operated independently when the shift L-lever of an automatic car is placed in the drive position, and 38 is a relay. .

Next, to describe its operation, when applying the parking brake, by depressing the brake pedal arm 24, the brake cable 25 is pulled in the same way as in the conventional case, and the parking brake (not shown) is applied. On the other hand, when the brake pedal arm is operated, the ratchet gear 23 flips up the worm gear 27 against the elastic force of the spring 31 and rotates it in the direction of the arrow, that is, clockwise, so the brake cable 25 is pulled without any problem. . After applying the parking brake and releasing the brake pedal arm 24,
The tensile force of the spring 31 maintains the engagement between the ratchet gear 23 and the worm gear 27, and the braking force of the parking brake is maintained without restoring the brake pedal arm 24.

Next, when the braking force of the parking brake is released, the switch 37 is manually operated, or the change lever is returned to the drive position and switched to operate the relay 38 and rotate the motor 34. The worm gear 27 rotates, and as a result, the brake pedal arm 24 rotates counterclockwise as shown by the arrow in FIG. 3, and the braking force of the parking brake is released. At this time, the switch 35 is activated and the warning lamp 36 is turned off. The braking force of the parking brake can be released by operating the switch 37 in this way, but if the motor 34 is not started due to a malfunction in the power supply or electric circuit, the manual lever 3
If it is pulled up against the tensile force of the spring 31, the ratchet gear 23 and the worm gear 27 are disengaged, and the braking holding force of the brake pedal arm 24 is released.

In the embodiment shown in FIG. 4, a reduction gear group 39 is interposed between the motor 34 and the drive shaft 29, so that the worm gear 27 can be rotated slowly.

Therefore, according to these embodiments, the parking brake is actuated by depressing the brake pedal arm 24, and the braking force of the parking brake can be released by automatic or manual switching. In this type of parking brake, the brake release operation can be performed extremely easily and reliably.

[Summary of the invention]

As described above, the present invention provides a foot-operated parking brake that has an arc-shaped ratchet gear 23 formed at one end and a brake pedal arm 24 to which a brake cable 25 is connected.
a worm gear 27 that meshes with the ratchet gear 23; a spring 31 that elastically maintains the mesh between the worm gear 27 and the ratchet gear 23; a motor 34 that is connected to the worm gear 27 via a universal joint 28; This is a foot-operated parking brake release mechanism characterized by having a switch 37 that operates a motor 34.

[Effects of the Invention] Therefore, according to the present invention, since the braking force release operation of the brake pedal arm 24 can be performed automatically or manually by switching, there is an effect that the parking brake release operability is improved. Further, according to the present invention, the worm gear 27 that meshes with the ratchet gear 23 of the brake pedal arm 24 can be molded from resin, which improves ease of production and reduces costs. Furthermore, according to the present invention, since the restoring operation of the brake pedal arm 24 is smoothly performed by the rotation of the motor, there is also an effect that the impact noise that is generated when the brake pedal arm 24 is restored as in the past can be eliminated. .

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an embodiment of the parking brake release mechanism according to the present invention, Fig. 2 is an electrical circuit diagram thereof, Fig. 3 is an explanatory diagram of its operation, and Fig. 4 is an illustration of another embodiment of the present invention. An explanatory diagram showing an example, FIG. 5 is an explanatory diagram of a conventional example. 21... Base frame 22... Support shaft 23...
・Ratchet gear 24...Brake pedal arm 25...Brake cable 26...Connector 27・
... Worm gear 28 ... Universal joint 29 ...
Drive shaft 30... Bush 31... Spring 32... Manual lever 33... Through hole 34... Motor 35.37... Switch 36... Warning lamp 38... Relay 39...・Reduction gear group Fig. 4 0, 5? 8W1 1986-214039 (5) Figure 5

Claims (1)

[Claims] In a foot-operated parking brake having a brake pedal arm (24) formed with an arc-shaped ratchet gear (23) at one end and connected to a brake cable (25), the ratchet gear (23) of the brake pedal arm (24) is Worm gear (27) meshed with 23)
, the worm gear (27) and the ratchet gear (23)
a spring (31) that elastically maintains meshing with the worm gear (27), a motor (34) connected to the worm gear (27) via a universal joint (28), and a switch (37) that operates the motor (34). A foot-operated parking brake release mechanism characterized by having the following features: