JPH062848Y2 - Parking brake device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a parking brake device having an actuator for reducing the operating force of an operating lever.

[Prior Art] As a conventional parking brake, for example, one using an actuator to actuate the parking brake with an operation lever and reduce the operation force of the operation lever is known. The advantage of this parking brake is that it is only necessary to pull the operating lever lightly by the power assist from the actuator.

[Problems to be Solved by the Invention] However, in such a conventional parking brake device, since it is difficult to balance the operation amount of the operation lever and the operating force of the actuator, sufficient power assist is not provided. There is a problem in that it is not obtained, and the followability is not good.

The present invention has been made in view of such conventional problems, and a parking brake device that detects a relative displacement amount between an operation amount of an operation lever and an operation amount of an actuator to reduce the relative displacement amount. Is intended to provide.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an operation lever,
An actuator, a balance lever on one end of which an operating force of the operation lever acts and an other end of which acts on the actuator and a parking brake force on an intermediate portion, and a relative displacement for detecting a relative displacement between the operation lever and the actuator. And a control means for controlling the actuator so that the relative displacement detected by the relative displacement means becomes small.

[Operation] In the present invention, since the relative displacement between the operation lever and the actuator is detected and the actuator is operated so that the relative displacement amount becomes small, sufficient power assist can be obtained.

Further, since the regulating means is provided so that the relative displacement amount of the operation lever and the actuator is equal to or less than a certain value, and the connecting portion of the balance lever, the operation lever and the actuator is slidable, the balance lever can be easily moved and Even if one actuator does not operate, it can be operated by the lever without loss of force.

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

1 and 2 are views showing an embodiment of the present invention.

First, the structure will be described. In FIG. 1, 1 is an operating lever, and 2 is an actuator. Reference numeral 3 denotes a balance lever. One end of the balance lever 3 is acted upon by the operation force of the operation lever 1, the other end is actuated by the actuator 2, and the intermediate portion between the one end and the other end is subjected to the parking brake force. Is designed to work.

Reference numeral 4 denotes a connecting portion between the operation lever 1 and the balance lever 3, 5 denotes a connecting portion between the actuator 2 and the balance lever 3, and these connecting portions 4 and 5 are configured to be slidable, respectively. When only one of them operates, the operating lever 1 or the connecting portions 4 and 5 on the non-actuating side of the actuator 2 slide so as not to hinder the movement of the balance lever 3. In this embodiment, the slidable connecting portions 4 and 5 are provided on the operation lever 1 side and the actuator 2 side, respectively, but the slidable connecting portion 5 is provided only on the actuator 2 side and the operating lever 1 side is provided. May be fixed to the balance lever 3.

The balance lever 3 is connected to an equalizer 7 via a connecting member 6, and the equalizer 7 is connected to a brake unit for the rear wheels 9 and 10 via a bracket member 8. A stopper portion 11 serving as a regulating means is provided on the connecting member 6 so as to approach the balance lever 3, and the stopper portion 11 regulates the relative displacement amount of the balance lever 3 to be a fixed value or less. That is, the stopper portion 11 regulates the inclination of the balance lever 3 so as to be a certain value or less.

A pair of relative displacement detection switches (relative displacement detection means) 12 and 13 for detecting relative displacement of the balance lever 3 are provided on the stopper portion 11, and each relative displacement detection switch 1
Reference numerals 2 and 13 designate a relative displacement detection signal as a control circuit (control means) 1.
Output to 4 respectively.

The control circuit 14 controls the actuator 2 based on the relative displacement detection signals of the relative displacement detection switches 12 and 13 so that the relative displacement amount becomes small.

Next, the configuration of the control circuit 14 will be described with reference to FIG.

In FIG. 2, 12 is the relative displacement detection switch, 2
Reference numeral 1 denotes a motor forward rotation first relay which is turned on when the relative displacement detection switch 12 is closed, 13 is the relative displacement detection switch, and 22 is a motor reverse rotation second relay which is turned on when the relative displacement detection switch 13 is closed. is there.

23 is a normally open contact of the first relay 21, 24 is the first relay 2
1 normally closed contact, 25 is a normally open contact of the second relay 22, 26
Is a normally closed contact of the second relay 22.

When the first relay 21 is turned on to close the normally open contact 23 and the normally closed contact 24 is opened, the electric motor 2A constituting the actuator 2 is normally rotated, and when the second relay 22 is turned on, the normally open contact 25 is closed. When the closing contact 26 opens, the electric motor 2A rotates in the reverse direction.

Next, the operation will be described.

First, the case where the parking brake is operated by the operation lever 1 will be described.

When the operation lever 1 is pulled up, the balance lever 3 is tilted, the relative displacement detection switch 12 is turned on, and the first relay 21 is turned on. When the first relay 21 is turned on, the normally open contact 23 is closed and the normally closed contact 24 is opened.
A rotates normally. When the balance lever 3 is balanced by the forward rotation of the electric motor 2A, the relative displacement detection switch 12 is turned off and the first relay 21 is also turned off.
A stops. In this way, the parking brake can be operated with the assistance of the actuator 2.

Next, the case where the parking brake is released by the operation lever 1 will be described.

When the operation lever 1 is returned to its original position, the balance lever 3 tilts in the opposite direction to the above case, the relative displacement detection switch 13 is turned on, and the second relay 22 is turned on.

When the second relay 22 is turned on, the normally open contact 25 is closed and the normally closed contact 26 is opened, so that the electric motor 2A is rotated in the reverse direction. Since the balance lever 3 is balanced by the reverse rotation of the electric motor 2A, the relative displacement detection switch 13 is turned off and the second relay 22 is also turned off, so that the electric motor 2A is stopped. In this way, the parking brake can be released.

When the actuator 2 does not operate, the balance lever 3 tilts when the operation lever 1 is pulled, but the stopper portion 11
It does not tilt more than a certain amount. Further, since the connecting portion 5 slides, the parking brake can be operated without loss of force.

[Effects of the Invention] As described above, according to the present invention, the relative displacement between the operation lever and the actuator is detected, and the actuator is operated so that the relative displacement amount becomes small. Can be obtained.

The power assist rate can be changed by designing the connecting portion of the balance lever and the connecting portion at a position moved to the operation lever side or the actuator side.

Further, since the regulating means is provided so that the relative displacement amount of the operation lever and the actuator is equal to or less than a certain value, and the connecting portion of the balance lever, the operation lever and the actuator is slidable, the movement of the balance lever is facilitated and the actuator The parking brake can be operated without loss of force even when the vehicle does not operate.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, and FIG. 2 is a configuration diagram of a control circuit. In the figure, 1 ... Operation lever, 2 ... Actuator, 2A ... Electric motor, 3 ... Balance lever, 4, 5 ... Connection part, 6 ... Connection member, 7 ... Equalizer, 8 ... Bracket member, 9, 10 ... Rear wheel, DESCRIPTION OF SYMBOLS 11 ... Stopper part (regulating member), 12, 13 ... Relative displacement detection switch (relative displacement detection means), 14 ... Control circuit (control means), 21 ... 1st relay, 22 ... 2nd relay, 23 ... 1st relay Normally open contact, 24 ... normally closed contact of first relay, 25 ... normally open contact of second relay, 26 ... normally closed contact of second relay.

Claims (3)

[Scope of utility model registration request] 1. An operating lever, an actuator, a balance lever on one end of which an operating force of the operating lever acts, and on the other end of which a working force of the actuator acts, and a parking brake force acting on an intermediate portion, and the operating lever. A parking brake device comprising: a relative displacement detection means for detecting a relative displacement of the actuator; and a control means for controlling the actuator so that the relative displacement detected by the relative displacement detection means becomes small. 2. The parking brake device according to claim 1, wherein a regulating means for regulating a relative displacement amount of the operation lever and the actuator so as to be a fixed value or less is provided in the vicinity of the balance lever. 3. The balance lever can be moved when only one of the connecting portion of the balance lever, the operating lever and the actuator or both of them is operated. The parking brake device according to claim 1, wherein the parking brake device is slidable.