JPH0825437B2 - Parking brake device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a parking brake device,
In particular, the present invention relates to a parking brake device that prevents the wheels that operate the brake device from locking when the parking brake operating means such as the parking brake pedal or the parking brake lever is suddenly braked while the vehicle is traveling. .

[Conventional technology]

There are two types of conventional parking brake devices: a stepping type in which the parking brake pedal is stepped on by a foot, and a manual type in which the parking brake lever is pulled by hand.

As a conventional foot-operated parking brake device,
For example, the one described in Japanese Utility Model Publication No. 61-161065 is known.

In this conventional device, the brake device for the rear wheels is operated via the cable by depressing the parking brake pedal, and the release lever at hand is operated to release the operation of the brake device. An air damper is installed between the parking brake pedal and the pedal bracket, and this air damper extends when the parking brake pedal returns, and when this extension occurs, a slight damping force is generated by the orifice, and the mud jumps due to the jumping up of the parking brake pedal. Is being prevented.

Further, such an air damper is not used in the conventional manual parking brake device.

[Problems to be Solved by the Invention]

However, in such a conventional parking brake device, a parking brake operating means such as a parking brake pedal or a parking brake lever may be suddenly operated during an emergency during traveling,
Such an abrupt brake operation of the parking brake operating means causes a full stroke to be operated all at once, and the rising speed of the braking torque increases in proportion to the operating speed, causing a problem that the braking wheels are locked. .

Further, in the parking brake device equipped with the above-mentioned air damper, this air damper is for returning the parking brake pedal, that is, for providing a light damping force on the extension side of the air damper to prevent the parking brake pedal from jumping up, No damping force is applied to the brake operating side of the parking brake pedal, that is, the contracting side of the air damper. For this reason, this air damper does not generate any reaction force against the above-mentioned sudden braking operation, and does not prevent the wheels from being locked.

The present invention has been made in view of such a conventional problem, and the parking brake is designed to prevent the wheels from being locked even when the parking brake operating means is suddenly operated during an emergency such as traveling. The purpose is to provide a device.

[Means for solving the problem]

In view of this, the parking brake device of the present invention is provided with a reaction force generation mechanism that generates a large operation reaction force when the braking operation of the parking brake operation means is rapid.

[Action]

When the parking brake operating means is abruptly operated while the vehicle is traveling, a large operation reaction force is generated by the reaction force generation mechanism, the sudden braking operation of the parking brake operating means is alleviated, and the operation speed is reduced. This reduces the rising speed of the braking torque,
Wheel locks are prevented.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

First, as a first embodiment, the configuration when applied to a foot-operated parking brake device equipped with a hydraulic damper will be described.

In FIG. 1, a pedal bracket 1 is fixed to the vehicle body side, and a parking brake pedal 2 as a parking brake operating means is rotatably attached to the pedal bracket 1. A return spring 3 is mounted between the parking brake pedal 2 and the pedal bracket 1 and always urges the parking brake pedal 2 in the returning direction. The parking brake pedal 2 is connected via a release cable 4 to a hand release lever 5 as a release means.

A hydraulic damper 6 as a reaction force generating mechanism is mounted between the parking brake pedal 2 and the pedal bracket 1. The relationship between the hydraulic damper 6 and the parking brake pedal 2 is that the parking brake pedal 2 is on the brake operation side. That is, when the parking brake pedal 2 is depressed, the hydraulic damper 6 is on the contracted side, and the return side of the parking brake pedal 2 is on the extended side of the hydraulic damper 6.
The hydraulic damper 6 will be described in detail later.

The front cable 7 is composed of an inner cable 8 and an outer cable 9. One end of the inner cable 8 is connected to the parking brake pedal 2 and the outer cable 9
One end side of is fixed to the pedal bracket 1. And
The other end of the outer cable 9 is fixed to the vehicle body side via a bracket 10, and the other end of the inner cable 8 is connected to the equalizer 11.

Further, a right rear cable 14 including an inner cable 12 and an outer cable 13 and a left rear cable 17 including an inner cable 15 and an outer cable 16 are connected to the equalizer 11 and the brake devices 30, 30 on the rear wheel side, respectively. It An adjuster 18 for adjusting the clearance of the brake device is provided in the middle of the inner cables 12 and 15.

As shown in FIG. 3, the characteristic of the hydraulic damper 6 is that the return side generates a light damping force proportional to the square of the piston speed with a small coefficient as in the conventional case (broken line A). Then, normally, of this damping force, only the area indicated by the thin line B is used.

In the present invention, as shown by the thick line C, the orifice is set independently of the return side so that the damping force on the brake operating side is proportional to the square of the piston speed with a large coefficient,
The parking brake pedal 2 is configured such that a larger operation reaction force is generated as the operation of depressing the parking brake pedal 2 is rapid and the operation speed is higher.

 Next, the operation of the first embodiment will be described.

The parking brake pedal 2 is used for normal parking brake operation when the vehicle is stopped or parked on a slope.
By stepping on the foot, the brake device is actuated via the front cable 7, the right rear cable 14 and the left rear cable 17, and the parking brake is actuated. At this time, since the speed of the brake operation is usually not so high, the damping force of the hydraulic damper 6 as the reaction force generating mechanism is not so large.

When the parking brake is released, the parking brake pedal 2 is unlocked by operating the hand release lever 5, and the parking brake pedal 2 is returned by the restoring force of the return spring 3. At this time, the return force of the hydraulic damper 6 prevents the parking brake pedal 2 from jumping up.

For example, when the parking brake pedal 2 is suddenly depressed during an emergency while the vehicle is traveling, the damping force increases as the operation speed, that is, the piston speed of the hydraulic damper 6 increases, and a large operation reaction force is generated to cause the parking brake. The operation speed of the pedal 2 is reduced, and thus the rising speed of the braking torque is reduced, the lock of the wheels is prevented, and the normal brake operation is performed.

At this time, the rigidity of the operation of the parking brake pedal 2 is also improved.

Next, as a second embodiment, a case of a manual parking brake device will be described.

First, the structure will be described. In FIG. 2, a parking brake lever 21 is rotatably attached to a lever bracket 20 fixed to the vehicle body side. Further, a knob 22 as a releasing means is attached to the tip of the parking brake lever 21.

Then, one end of the front cable 7 is connected to the lever bracket 20 and the parking brake lever 21,
The other end of the front cable 7 is connected to the bracket 22 and the equalizer 11 which are fixed to the vehicle body. Further, a right rear cable 14 and a left rear cable 17 are connected between the equalizer 11 and a brake device (not shown) for the rear wheels.

Then, a hydraulic damper 23 as a reaction force generating mechanism is attached between the equalizer 11 and the vehicle body side.

The relationship between the hydraulic damper 23 and the parking brake lever 21 is that the hydraulic damper 23 is on the extension side during the brake operation for pulling up the parking brake lever 21, and the knob 22 as the releasing means is pushed to push the parking brake lever 21.
When releasing 21 is released, the parking brake lever 21 is on the return side and the hydraulic damper 23 is on the contraction side.

The characteristic of this hydraulic damper 23 is that the damping force on the brake operating side is as shown by the thick line C in FIG. 3, and in proportion to the square of the piston speed on the brake operating side, a sudden operation of the parking brake lever 21 causes A large damping force is generated.

It should be noted that this hydraulic damper 23 does not require any damping force on the return side, and may have no damping force on the return side or may have a small damping force.

The operation of the second embodiment is also the same as that of the first embodiment described above. The normal parking brake operation and the release operation are performed when the vehicle is stopped or parked on a hill, and the parking brake lever 21 is used in an emergency while the vehicle is traveling. When the vehicle is suddenly pulled up, a large damping force is generated by the hydraulic damper 23 in accordance with the operation speed, and the large operation reaction force decreases the operation speed of the parking brake lever 21 and decreases the rising speed of the braking torque. As a result, the rear wheels are prevented from locking.

Also in this case, the rigidity of the operation of the parking brake lever 21 is also improved.

In the above-described two embodiments, the hydraulic damper is used as the reaction force generating mechanism, but the frictional resistance may be used.

〔The invention's effect〕

As described above, according to the parking brake device of the present invention, since the reaction force generating mechanism that generates a large operation reaction force when the braking operation of the parking brake operating means is sudden is provided, It is possible to prevent the wheels from being locked when the parking brake operating means is suddenly operated in an emergency and to improve the rigidity of the parking brake operating means.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a parking brake device of the present invention, FIG. 2 is a perspective view of a second embodiment, and FIG. 3 is a view showing characteristics of a hydraulic damper. 1 ... Parking brake pedal (parking brake operating means), 5 ... Hand release lever (release means),
6,24 …… hydraulic damper (reaction force generation mechanism), 7 …… front cable, 14 …… right rear cable, 17 …… left rear cable, 21 …… parking brake lever, 22 …… knob, 30
...... Brake device.

Claims (1)

[Claims] 1. A parking brake device in which a brake device is operated by a brake operation of a parking brake operation device and the operation of the brake device is released by a release device, and a large operation is performed when the brake operation of the parking brake operation device is rapid. A parking brake device having a reaction force generation mechanism for generating a reaction force.