JPH02151552A - Parking brake device - Google Patents

Abstract

PURPOSE:To contrive the reduction of control force by constituting a device applying the control force of a stick-type control lever and acting force of an actuator to an assist lever and transmitting its motion to a parking brake means through an acting lever. CONSTITUTION:For applying a parking brake, when a stick lever 1 is lifted, control force (f) is applied to a balance lever 14 in its connection part 14a, and by swiveling said lever 14 a little in the clockwise direction for an acting lever 12, the first contact of a switch 18 is closed. Then a control circuit 19 drives an actuator 15 swiveling an assist lever 13 in the clockwise direction, and acting force FA is applied from a pin 14a to a butt part 14b of the balance lever 14 swiveled in the counterclockwise direction. Thus driving the acting lever 12 in the clockwise direction, wheel brakes 5L, 5R are applied.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a parking brake device for a vehicle, and more specifically, the present invention relates to a parking brake device for a vehicle, and more specifically, a parking brake device that performs power assist using a boosting mechanism to reduce the operating force of an operating lever. Regarding brake equipment.

(Prior Art) Generally, in a parking brake device for a vehicle, a manual or foot-operated operating lever is operated, and the parking brake is applied manually via a transmission system such as a cable or link connected to the operating lever. Some wheel brakes or center brakes are being driven. A ratchet-type locking mechanism or the like is provided between this operating lever and the vehicle body to lock the operating lever in the operated position, and the amount of operation of the operating lever is increased in stages to generate a relatively large wheel braking torque. I'm trying to get it.

(Problem to be Solved by the Invention) However, in such a conventional parking brake device, the wheel brake etc. are driven only by manually operating the operating lever, so it is difficult to drive the vehicle up a slope. This required a large amount of operating force when parking or stopping the vehicle. For this reason,
In particular, when the control lever is manual, there are problems such as when stopping on a slope, there is not enough force to operate the lever, causing the vehicle to move backwards, and the driver becomes tired due to the large force required to operate the lever. .

On the other hand, in order to solve these problems, the applicant of the present application filed Japanese Patent Application No. 63-219459 for a parking brake device that reduces the operating force by providing a simple boosting mechanism. However, even in this case, there is room for improvement in the boosting mechanism, especially when the operating lever is of a stick type, considering the arrangement of the operating lever and the method of operating it.

The present invention has been made in view of the above-mentioned conventional problems, and uses a booster mechanism suitable for particularly when the operating lever is a stick type to reduce the operating force of the operating lever, and also reduces the operating force of the parking brake device. It is intended to simplify configuration.

(Means for Solving the Problems) In order to achieve the above objects, the present invention includes (1) a boosting mechanism that boosts the operating force from the operating lever to drive the parking brake means; The mechanism includes an operating lever that is swingably supported by a support member fixed to the vehicle body and swings to actuate and release the parking brake means; an assist lever that swings in response to the actuation force of the actuator; and an assist lever that is swingably supported by the actuation lever and that can collide with a connecting portion that is swingably connected to the operating lever and the other end of the assist lever. It is characterized by comprising a balance lever having an abutting portion, a displacement detection means for detecting the swinging displacement of the balance lever with respect to the operating lever, and a control means for controlling the operation of the actuator based on the detection information of the displacement detection means. (2) A device characterized in that a regulating means is provided for regulating the swinging displacement of the balance lever with respect to the operating lever within a predetermined range; (3) the regulating means is characterized in that the a hole formed in one of the two, and a stopper pin supported by the other and loosely inserted into the hole; The balance lever is swingably supported by an operating lever, and the direction of swinging of the balance lever accompanying the operation of the operating lever for operating the parking brake means is opposite to the direction of swinging due to the collision of the abutting portion and the assist lever. (5) The displacement detecting means includes a switch fixed to one of the balance lever and the operating lever, and a switch provided on the other so as to be able to engage with the switch. (6) The balance lever has a first portion that abuts against the operating lever, and a second portion whose swinging displacement is regulated by the regulating means. , a third part whose rocking displacement is detected by the regulating means, and a distance between the first part and the second part is smaller than a distance from the first part to the third part. (7) At least two of the actuation lever, the assist lever, and the balance lever each have a pair of parallel plate-like members, and each of the pair of plate-like members excludes the two levers ( (8) The pair of plates, wherein one of the operating lever and the balance lever is arranged on both sides of the other lever. The assist lever has a pair of plate-like members disposed outside of the operating lever and the balance lever.

(Function) In the first invention, the operating force from the operating lever and the operating force from the actuator are applied to the balance lever, and the operating lever is oscillated via the balance lever, thereby operating the parking brake means. Operate. Therefore, the operating force for swinging the operating lever is power assisted by the operating force from the actuator, and the operating force for the operating lever is reduced.

In addition, the operating lever and assist lever are swingably supported by a support member fixed to the vehicle body, and power assist by the actuator is promoted based on the swinging displacement of the balance lever with respect to the operating lever, so the length of each lever can be set appropriately. By doing so, it becomes a simple parking brake device with a booster attached to the side, which is suitable when the operation lever is a stick type.

In the second invention, the regulating means regulates the swinging displacement of the balance lever with respect to the operating lever within a predetermined range. Therefore, when the actuator fails, etc., the parking brake means can be operated only by manual operation.

In the third invention, the regulating means is easily configured by loosely inserting the stopper pin into the hole.

In the fourth invention, the balance lever swings in the opposite direction when it is operated in the operating direction by the operating lever and when it collides with the assist lever. Therefore, power assist by the actuator can be prompted in response to the operation of the control lever.

In the fifth invention, the displacement detection means is simply constituted by the switch and the contact member that can be engaged with the switch.

In the sixth invention, the first point is the center of swing of the balance lever.
The distance from the part to the second part whose swing is regulated by the regulating means is made smaller than the distance from the first part to the third part which is the detection point of the swing displacement. Therefore, the displacement amount of the displacement detection point is large, and the detection accuracy of the displacement detection means is increased.

In the seventh invention, two of the operating lever, the assist lever, and the balance lever that relatively swing or collide are configured to have a pair of plate-like members that are parallel to each other on both sides of the other one. . Therefore, unnecessary twisting or the like does not occur in each lever.

In the eighth invention, the assist lever is arranged in parallel on the outside of the actuating bar and the balance lever in which the regulating means is interposed. Therefore, the restriction means can be easily installed, and the degree of freedom in layout of the operating lever and actuator is increased.

(Example) Hereinafter, the parking brake device according to the present invention will be specifically described based on first and second examples.

1 to 3 are diagrams showing a first embodiment of a parking brake device according to the present invention.

First, the configuration will be explained. In Figures 1 to 3, 1 is a stick-type operating lever (hereinafter referred to as
The stick lever 1 is axially movably supported by a bracket 3 fixed to a vehicle body B (not shown in detail) via a support mechanism 2 having a guide member 2a. The support mechanism 2 can lock the cane lever 1 at a plurality of operating positions to maintain the operating force of the cane lever 1 using a known ratchet or the like (not shown), and can lock the cane lever 1 at a plurality of operating positions using a known ratchet or the like (not shown). This lock can be released by rotating the stick lever 1, and by increasing and decreasing the amount of operation of the stick lever 1 in stages, it is applied to the wheel brakes 5L and 5R (parking brake means) via the transmission system 4. The driving force is changed. The transmission system 4 consists of a booster mechanism 6, a connecting member 7, a parking cable 8, etc., and the wheel brakes 5L and 5R are, for example, drum brakes or disc brakes attached to the rear wheels of the vehicle. This is a known type with a built-in brake mechanism.

Further, the boosting mechanism 6 includes a pin 1 provided on the bracket 3.
), an actuation lever 12 and an assist lever 13 that are swingably supported by a bracket 3 as a support member via this pin 1), and a balance lever 14 that is swingably supported by the actuation lever 12. Assist lever 1
and an actuator 15 connected to one end of the actuator 3. The actuation lever 12 is connected to the bracket 3 via the pin 1).
A parking cable 8 is connected via a connecting member 7 to a predetermined swing radius position of the operating lever 12.
The input ends 8a of the two are removably connected. Further, a support portion 14r (first portion) of the balance lever 14 is pin-coupled to the swing end side of the operating lever 12 via a pin 12p. Assist lever 13 has pin 1 in the middle)
It is swingably supported by the bracket 3 via the bracket 3, and swings by receiving the operating force of the actuator 15 at its end. The actuator 15 is, for example, a lead screw 15.
3, which operates the balance lever 14 via a moving member 16 threadably connected to the lead screw 15a.
receives the actuating force. balance lever 1
4 is a connecting portion 14a swingably connected to the lower end of the stick lever l via a pin 17 and an assist lever 1.
The balance lever 14 has an abutment part 14b that can abut against a pin 13a provided at the other end of the balance lever 14.
It is swingably supported by the operating lever 12 between the abutting portion 14b and the abutting portion 14b. And wheel brake 5L, 5
The direction in which the balance lever 14 swings when the stick lever 1 is operated to operate R is opposite to the direction in which the balance lever 14 swings due to the collision between the abutting portion 14b and the assist lever 13. Actuating lever 1 receives force from at least one of assist levers 13
It is designed to swing relative to 2.

A switch 18 is provided between the operating lever I2 and the balance lever 14 as a displacement detecting means for detecting the swinging displacement of the balance lever 14 with respect to the operating lever 12. The switch 18 has a pair of levers 18a and 18b that engage with contact portions 12a and 12b (which together with the switch 18 constitute displacement detection means) are bent and provided at one end of the actuation lever 12, for example. It is fixed to a swinging part 14t (third part) of the balance lever 14, and two contacts (not shown) open and close at different timings as the levers 18a and 18b swing. Specifically, when the assist lever 14 swings relative to the operating lever 12, the lever 18
One of the levers 18a and 18b is pressed by one of the actuation levers 12a and 12b by a predetermined amount to close (or open) the first contact, and at this time, the other lever 18a and 18b returns to open the second contact. (or closed).

The switch 18 is connected to a control circuit 19 that controls the actuator 15, and the control circuit 19 drives the actuator 15 in normal rotation when the first contact of the switch 18 is closed, and drives the actuator 15 in normal rotation when the second contact of the switch 18 is closed. The actuator 15 is driven in reverse. That is, the control circuit 19 constitutes a control means for controlling the operation of the actuator 15 so that the swing displacement of the balance lever 14 with respect to the operating lever 12 is equal to or less than a predetermined amount based on the detection information of the first switch.

Then, the operating force from the stick lever 1 and the operating force from the actuator 15 via the assist lever 13 swing the operating lever 12 pin-coupled to the balance lever 14 to drive (actuate) the wheel brakes 5L and 5R. At the same time, the operation lever 12 is swung by the release operation of the stick lever 1 and the reverse operation of the actuator 15, thereby releasing the wheel brakes 5L and 5R.

On the other hand, an intermediate portion 14S of the balance lever 14, which is one of the operating lever 12 and the balance lever 14
A hole 14c is formed in the other operating lever 12, and a stopper pin 21 is loosely inserted into the hole 14c and supported, and the swinging displacement of the balance lever 14 with respect to the operating lever 12 is The lever 14 is stopped by the actuating lever 12 via the stopper pin 21, thereby being regulated within a predetermined range.

That is, a regulating means 22 consisting of a hole 14c of the balance lever 14 and a stopper pin 21 is provided.
Actuator 15, switch 18 or control circuit 19
When the actuating lever 12 is to be swung by the cane lever l when the actuating lever 12 fails, the actuating lever 1 is regulated by the regulating means 22.
The wheel brakes 5L and 5R are operated while the wheel brakes 2 and the balance lever 14 are integrally swung. Furthermore, as shown in FIG. 2, the balance lever 14
The distance from the pin 12p, which is the supporting part of the switch 18, to the regulating means 22 is smaller than the distance from the pin 12p to the mounting position of the switch 18, and the lever 13a of the switch 18,
A predetermined swing stroke can be obtained at 18b, so that the switch 1B can be operated accurately even if the amount of backlash of the regulating means 22 is reduced.

As shown in FIG. 3, at least two of the actuation lever 12, the assist lever 13 and the balance lever 14, for example the actuation lever 12 and the assist lever 1,
3 is a pair of parallel plate members 12A, 12B,
13A and 13B, and these plate-like members 12A
, 13A, 12B, and 13B are arranged on both sides of the balance lever 14, which is another lever. Specifically, one of the operating lever 12 and the balance lever 14, the operating lever 12, has a pair of plate members 12A and 12B symmetrically arranged on both sides of the other lever, the balance lever 14. and assist lever 13
has a pair of plate-like members 13A and 13B arranged symmetrically on the outside of the operating lever 12 and the balance lever 14. Then, the pin 12p of the actuation lever 12 and the pin 13a of the assist lever 13 are connected to the plate member 12, respectively.
A and 12B or between plate-like members 13A and 13B. In FIG. 3, reference numeral 7a denotes a connecting pin that is fixed to the operating lever 12 and connects the connecting member 7 to the operating connecting portion 12 in a swingable manner. Further, in FIG. 2, 23 is a switch for detecting return and switching the lamp for indicating parking brake operation from ON to FF, and the switch 23 has a lever 23a that can swing in contact with the balance lever 14. There is.

Next, the effect will be explained.

First, in FIG. 1.2, when the stick lever 1 is pulled up to operate the parking brake, an operating force f is applied to the connecting portion 14a of the balance lever 14, and the balance lever 14 moves clockwise relative to the operating lever 12. The slight rocking causes the first contact of switch 18 to close. Also, if the switch 23 is opened (or closed)
An indicator lamp is displayed. At this time, the control circuit 19 drives the actuator 15 in forward rotation so that the assist lever 13 swings clockwise, and the actuating force FA from the actuator 15 is applied from the pin 13a of the assist lever 13 to the abutting portion 14b of the balance lever 14. The balance lever 14 swings counterclockwise, and the assist lever 13 is driven and swings clockwise to operate the wheel brakes 5L and 5R. In this state, the boosting mechanism 6
applies the operating force f and the operating force FA to the swinging end of the actuating lever 12, and generates an even greater boosted brake driving force at the connecting portion of the connecting member 7, which has a small swing radius.
The wheel brakes 5L and 5R can be easily operated with a small operating force r.

When the cane lever 1 is pulled up by a desired amount, the cane lever 1 is raised while the operating force f is maintained by the support mechanism 2.
is locked, and further, the balance lever 14 receives the actuation force FA from the actuator 15 and swings counterclockwise, opening the first contact of the switch 18. The actuator 15 is stopped and the assist lever 13 and the balance lever are locked. 14 stops swinging. Note that the actuation force FA is such that the movable member 16 is
Since it is screwed to 2, it is maintained at the required value.

Therefore, even if the actuator 15 is stopped, the wheel brakes 5L and 5R are reliably operated with sufficient braking force.

On the other hand, when the cane lever 1 is lowered with a release operation, that is, a rotation operation of the handle la, to release the parking brake, the operating lever 12 swings counterclockwise due to the tension of the parking cable 8, etc., and the balance lever 14 swings counterclockwise with respect to the operating lever 12. Therefore, the second contact of the switch 18 is closed, and the control circuit 19 drives the actuator 15 in the reverse direction, causing the balance lever 14 to swing clockwise relative to the actuating lever 12, and the actuating lever 12 being further rotated in the opposite direction. The wheel brakes 5L and 5R are released by swinging clockwise.

When the stick lever l is completely restored (the state shown in FIG. 2), the balance lever 14, which had been swinging clockwise due to the reverse drive of the actuator 15, further swings relative to the operating lever 12, and the second When the contact of the actuator 1 is opened or the return detection switch 23 is closed, the actuator 1
5 is stopped. Further, at this time, the switch 23 in contact with the operating lever 12 closes (or opens), thereby clearing the indicator lamp, allowing the driver to identify that the parking brake has been released.

As described above, in this embodiment, the operation of the actuator 15 is controlled by the control circuit 19 based on simple displacement detection information such as opening and closing of the switch 18, and the operating force is doubled (that is, the operating force is increased by power assist). The wheel brakes 5L and 5R are reliably driven by the driving force generated by the vehicle.

Therefore, the operating force for the stick lever 1 is reduced.

Further, the actuation lever 12 and the assist lever 13 are swingably supported by the bracket 3 via the pin 1), and power assist by the actuator 15 is promoted based on the swinging displacement of the balance lever 14 with respect to the actuation lever 12. By setting the length of each lever 12, 13, 14 as appropriate, the transmission mechanism 6 can be installed compactly without protruding into the passenger compartment, and a suitable booster that is compatible with the operating direction and mounting structure of the stick lever 1 can be achieved. It can be a parking brake device attached to the side of the machine.

Furthermore, in this embodiment, the swinging displacement of the balance lever 14 relative to the actuating lever 12 is regulated within a predetermined range by the simple regulating means 22 consisting of the stopper bin 21 and the hole 14C of the balance lever 14. 18 or the control output circuit 19, the wheel brakes 5L and 5R are activated by manually operating the operating lever 1.

In addition, as described above, the switch 18, the regulating means 22
The accuracy of detecting the swinging displacement by the switch 18 can be improved from the positional relationship of the levers 12 and 13, and since the plate members 12A, 13A, 12B, and 13B are provided in parallel with each lever 12 and 13, and their arrangement is devised, The regulation means 22 can be easily installed, unnecessary twisting of each lever, etc. does not occur, and the degree of freedom in layout of the operating lever 1 and the actuator 15 is increased.

FIG. 4 is a diagram showing a second embodiment of the parking brake device according to the present invention, in which one of the operating lever 32 and the balance lever 34, the balance lever 34, is connected to the other lever. The assist lever 13 has a pair of plate-like members 34A and 34B arranged on both sides of the assist lever 32, and the plate-like members 13A and 13B of the assist lever 13 are arranged in parallel on the outside of the operating lever 32 and the balance lever 34. In addition, in the figure, 7b is the connecting pin 7a of the first embodiment.
The pin 12 that connects the operating lever 32 and the balance lever 34 is a connecting pin similar to that of the balance lever 34.
Fixed. The other configurations are the same as in the first embodiment, and the same effects as in the first embodiment can be obtained in this embodiment as well.

(Effect) According to the first invention, the operating force from the operating lever and the operating force from the actuator are applied to the balance lever, and the parking brake means is actuated by swinging the operating lever via the balance lever. Therefore, the operating force for swinging the operating lever can be power assisted by the operating force of the actuator, and the operating force for the operating lever can be reduced. In addition, the operating lever and assist lever are swingably supported by a support member fixed to the vehicle body, and power assist by the actuator is promoted based on the swinging displacement of the balance lever with respect to the operating lever, so the length of each lever can be reduced. By making appropriate settings, it is possible to obtain a simple parking brake device with a booster attached next to it, which is suitable when the operation lever is a stick type.

According to the second aspect of the invention, since the rocking displacement of the balance lever with respect to the operating lever is restricted within a predetermined range by the restriction means, when the actuator and the control means fail, etc.
The parking brake means can be activated or released only by manual operation.

According to the third invention, since the stopper pin is loosely inserted into the hole to constitute the regulating means, the regulating means can be made simple.

According to the fourth aspect of the invention, the balance lever is configured to swing in the opposite direction when the operating lever is operated in the actuating direction and when it collides with the assist lever, so that the balance lever does not correspond to the operation of the operating lever. power assist by the actuator.

According to the fifth invention, since the displacement detection means is constituted by the switch and the contact member that can be engaged with the switch, the displacement detection means can be made simple.

According to the sixth invention, the distance from the first part that is the center of swing of the balance lever to the second part whose swing is regulated by the regulating means is determined by the detection point of the swing displacement from the first part. Since the distance is smaller than the distance to a certain third portion, the amount of displacement of the displacement detection point can be increased and the detection accuracy of the displacement detection means can be improved.

According to the seventh invention, at least two of the operating lever, the assist lever, and the balance lever that swing or collide with each other have a pair of plate-like members arranged in parallel on both sides of the other lever. This makes it possible to prevent unnecessary twisting of each lever.

According to the eighth invention, since the assist lever is arranged in parallel on the outside of the actuation lever and the balance lever in which the regulating means is interposed, the regulating means can be easily installed, and the control lever and the actuator can be laid out freely. The degree can be increased.

[Brief explanation of the drawing]

Figures 1 to 3 are diagrams showing a first embodiment of the parking brake device according to the present invention, with Figure 1 being a model of its configuration, Figure 2 being its configuration, and Figure 3 being twice that size. FIG. 4 is a layout diagram of each lever constituting the force mechanism, showing a second embodiment of the parking brake device according to the present invention. 1...stick lever (operation lever), 3...
...Bracket (supporting member), 5L, 5R...
... Wheel brake (parking brake means), 6 ... Boosting mechanism, 12.32 ... Actuation levers 12a, 12b ... Contact portion (displacement detection means),
l3...Assist lever 14.34...Balance lever 14a...
...Connection part, 14b...Abutting part, 14c...Hole, 12p...Bin (first part), 14s...
...Intermediate part (second part) 14t...Owing part (third part) 15...Actuator, 18...Switch (displacement detection means) 19 ...
... Control circuit (control means), 21 ... Stopper bin, 22 ... Regulation means. Agent: Patent Attorney Arigagun

Claims (8)

[Claims] (1) A boosting mechanism is provided for driving the parking brake means by boosting the operating force from the operating lever, and the boosting mechanism is swingably supported by a support member fixed to the vehicle body, and the parking brake an actuating lever that swings to actuate and release the means; an assist lever that is swingably supported by a support member at an intermediate portion and swings at one end in response to the actuating force of an actuator; and an assist lever that swings freely on the actuating lever a balance lever supported by the operating lever and having a connecting portion swingably connected to the operating lever and an abutment portion capable of abutting against the other end of the assist lever; and a displacement device for detecting the swinging displacement of the balance lever with respect to the operating lever. A parking brake device comprising: a detection means; and a control means for controlling the operation of an actuator based on information detected by the displacement detection means. (2) The parking brake device according to claim 1, further comprising a regulating means for regulating the swinging displacement of the balance lever relative to the operating lever within a predetermined range. (3) The regulating means comprises a hole formed in one of the balance lever and the operating lever, and a stopper pin supported by the other and loosely inserted into the hole. Parking brake device. (4) The balance lever is swingably supported by the operating lever between the connecting portion and the abutment portion, and the direction of swinging of the balance lever is determined by the operation of the operating lever for actuating the parking brake means. 2. The parking brake device according to claim 1, wherein the direction of the parking brake is opposite to the direction of rocking caused by the collision between the collision portion and the assist lever. (5) Claim characterized in that the displacement detecting means comprises a switch fixed to one of the balance lever and the operating lever, and an abutment member provided on the other so as to be able to engage with the switch. 1. The parking brake device according to 1. (6) The balance lever includes a first part supported by the actuation lever, a second part whose swinging displacement is regulated by the regulating means, and a third part whose displacement is detected by the displacement detecting means. 3. The parking brake device according to claim 2, wherein the distance from the first portion to the second portion is smaller than the distance from the first portion to the third portion. (7) At least two of the actuation lever, the assist lever, and the balance lever each have a pair of parallel plate-like members, and each of the pair of plate-like members is connected to another lever other than the two levers. The parking brake device according to claim 1, wherein the parking brake device is arranged on both sides of the lever. (8) One of the operating lever and the balance lever has the pair of plate-like members arranged on both sides of the other lever, and the assist lever is arranged outside of the operating lever and the balance lever. 8. The parking brake device according to claim 7, comprising a pair of plate-like members.