JPH05221307A - Parking brake operating device - Google Patents

Abstract

PURPOSE:To obtain the high reliability, durability and fail safe characteristic by providing a first and a second locking means for preventing the turnaround of each output member of a motor and a car body to themselves, and providing a first releasing means for releasing the second locking means and a second releasing means for releasing both of the first and the second locking means. CONSTITUTION:A first ratchet 65 as a first locking mean is provided between a motor 61 as a rotating force generating means and an output means 64 of the motor 61 to prevent the turnaround of the output means 64. The output member 64 is provided with a second ratchet 70 as a second locking means for preventing the turnaround. The second ratchet 70 is pushed to release the locking of the second ratchet 70 and the output member 64 by electrifying a first releasing means solenoid 73. When a releasing cable 83 for releasing both of the first and the second ratchets 65, 70 is pulled to rotate a cam 84, and first, the second ratchet 70 is released, and furthermore, a claw 80 of the first ratchet 65 is released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking brake operating device for automatically or semi-automatically operating a parking brake of an automobile.

[0002]

2. Description of the Related Art A conventional parking brake operating device is disclosed in, for example, Japanese Patent Laid-Open No. 134036/1984.
There is known a manual parking brake operating unit, an actuator that pulls a brake cable by driving a motor, and a control circuit that controls the driving of the motor.

That is, in this operating device, a cable wire connected to a parking brake is fixed, and a first slide piston having an elongated hole in an axial direction is supported, and the first slide piston is slidably supported on an inner circumference. , A second slide piston slidably inserted in the piston support so as to move integrally with the first slight piston in the pulling direction of the cable wire, but to move in the opposite direction separately, A reverse motor is rotationally driven in forward and reverse directions through a worm formed on the shaft of the motor and a worm wheel that meshes with the worm, and one end of which is movably engaged with an elongated hole of the first slide piston. A wire winding drum having the other end of one wire fixed, and the other end of the second wire having one end fixed to the second slide piston,
In addition, the manual parking brake operating unit is movable in the pulling direction of the second wire and has a stopper mechanism for holding the moving position.

[0004]

However, in such a conventional parking brake operating device,
Since the holding of the brake cable depends on the self-locking action of the worm gear, if the self-locking action is reduced due to wear of the worm gear or vibration of the vehicle body, it is difficult to secure the parking brake holding force. as a result,
There is a problem that reliability and durability are reduced.

Further, after the motor is operated and the brake cable is pulled, if the motor cannot rotate in the reverse direction due to a failure of the control circuit or the motor, the brake cable cannot be returned and the parking brake cannot be released. As a result, there is a problem that the fail-safe property is not sufficient. The present invention has been made in view of such conventional problems, and when performing the operation of the parking brake automatically, it is possible to obtain high reliability, high durability, and high fail-safety. An object of the present invention is to provide a parking brake operating device.

[0006]

In order to achieve the above object, the present invention provides an actuator for outputting a cable pulling force of a parking brake, a detecting means for detecting a driving state of a vehicle, and a signal from the detecting means. An operating device for a parking brake, comprising: a control unit that drives and controls the actuator according to, and a switch unit that outputs a signal when the cable pulling force is proportional to the service brake hydraulic pressure and the cable pulling force exceeds a predetermined value. The actuator transmits a rotation force generating means for generating a rotation force, an output member transmitting a pulling force to a cable of a parking brake, a rotation of the rotation force generating means to the output member and faces the rotation force generating means. First locking means for preventing reversal of the output member, and reversal of the output member facing the vehicle body Two locking means, a first releasing means for releasing the second locking means, and a second releasing means for releasing both the first and second locking means. ..

[0007]

[Operation] When operating the parking brake automatically,
When the actuator pulls the brake cable, it is required to hold the braking force mechanically and reliably regardless of factors such as deterioration of durability of the actuator and vibration of the vehicle body. In addition to this, when a failure of the actuator occurs, it is required that the operation of the parking brake be manually performed without any trouble, regardless of the content of the failure.

In the present invention, the brake cable pulling force can be reliably retained by providing the second locking means between the output member for transmitting the pulling force to the brake cable and the vehicle body. When returning the cable, the second releasing means is released by the first releasing means, and the rotational force generating means is reversed. In addition to the above, by providing the first locking means between the rotational force generating means and the output member, and providing the second releasing means capable of manually releasing both the first and second locking means. Also, when the actuator pulls the brake cable and a failure occurs such that the rotational force generating means cannot reverse, the second releasing means releases the first and second locking means, and thereafter, It is possible to manually operate the parking brake without any trouble.

As a result, reliability, durability and fail-safety can be improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are views showing an embodiment of the present invention.
First, the configuration will be described. In FIG. 4, reference numerals 1 and 2 denote a pair of brake units, and the brake units 1 and 2 are connected to an equalizer 5 via cables 3 and 4. The equalizer 5 is connected to a parking brake lever 9 via a cable 6, a connector 7 and a cable 8.

The equalizer 5 is connected to an output lever 13 of a motor-driven actuator 12 via a cable 6, a connector 7, a cable 10 and a limit switch (switch means) 11 described later. That is, the limit switch 11 is provided at the connecting portion between the cable 10 and the output lever 13 of the actuator 12.

The actuator 12 outputs a cable pulling force that pulls the cable 10, and starts (forward rotation), stops, and returns (reverse rotation) according to commands from the controller (control means) 14. The controller 14 outputs a start command to the actuator 12 by a signal from the manual switch 15, the rear door opening / closing switch 16 and the like, and outputs a stop command to the actuator 12 by a signal from the limit switch 11. Further, the controller 14 outputs a return command to the actuator 12 by a signal from the transmission position switch 17, the clutch release switch 18, a manual release switch, etc., and outputs a reverse rotation stop command to the actuator 12 by a signal from the release completion switch of the actuator 12. To do. The manual switch 15, the rear door opening / closing switch 16, the transmission position switch 17, the clutch disengagement switch 18 and the like constitute the detecting means 19 for detecting the operating state of the vehicle.

Reference numeral 20 denotes a brake pedal. When the brake pedal 20 is depressed, a brake fluid pressure corresponding to the depression force is supplied from the master cylinder 21 to the limit switch 11 via the brake pipe 22. Next, the structure of the limit switch 11 will be described with reference to FIG. In FIG. 5, the limit switch 11 has a case 31 and a plug 32 fixed to the case 31. The plug 32 receives the output lever 13 of the actuator 12 through the lever connecting hole 33.
A switch 35 having a contact 34 is housed therein. The switch 35 is connected to the controller 14 via a lead wire 36.

A cylinder chamber 37 is formed in the case 31, and a plunger 38 is slidably accommodated in the cylinder chamber 37. Between the plunger 38 and the case 31, a compressed first spring 39 is provided between the washer 40,
41 is provided via the inlet 41, and the hydraulic chamber 42 has an inlet 4
3. The brake fluid pressure acts via the fluid passage 44.

Between the plunger 38 and the case 31,
Oil seals 45 and 46 are provided to prevent leakage of brake fluid. The function of the stopper of the plunger 38 to the left in the figure is that the snap ring 4 fixed to the case 31 is used.
7, and the large diameter portion 49 of the rod 48 performs the function of the stopper of the plunger 38 to the right in the figure.

The rod 48 is slidably inserted into the plunger 38, the cable 10 is inserted into and fixed to one end of the plunger 48, and the retainer 50 is attached to the other end.
Are fixed by screw connection. A second spring 51 is interposed between the retainer 50 and the plunger 38 in a compressed state. The retainer 50 can come into contact with or separate from the switch 35 housed in the plug 32.
The switch 35 is turned on and off depending on the positional relationship between the retainer 50 and the retainer 50.

Further, the tension (set load) of the second spring 51 is greater than the tension (set load) of the first spring 39.
Is set to be large. That is, when the cable pulling force is controlled by the set load of the first spring 39 and the brake fluid pressure acts, the first spring 3
The cable pulling force is controlled to a value in which the brake fluid pressure is added to the set load of 9, while the maximum operating force of the parking brake is determined by the set load of the second spring 51.

Next, the structure of the actuator 12 will be described with reference to FIGS. In FIG. 2, reference numeral 61 is a motor as a rotational force generating means, and the motor 61 has a worm gear (not shown). Reference numeral 62 denotes a drive shaft of the motor 61, and a drive member 63 is fixed to the drive shaft 62. The rotation of the motor 61 is decelerated by the worm gear and transmitted to the drive member 63 via the drive shaft 62. A first ratchet 65 as a first locking means is provided between the drive member 63 and the output member 64, and the rotation of the drive member 63 is
It is transmitted to the output member 64 via the first ratchet 65.

The first ratchet 65 prevents the output member 64 facing the drive member 63 from returning. An output lever 67 is fixed to an output shaft 66 of the output member 64, and the output shaft 66 is rotatably supported by an actuator housing 69 via a bearing 68. The rotation of the output member 64 causes the output lever 67 to pull the cable 10 via the limit switch 11.

As shown in FIG. 3, the output member 64 is provided with a second ratchet 70 as a second locking means in order to prevent the output member 64 from returning due to a pulling force from the cable 10. It is provided. The second ratchet 70 has a claw 72 that engages with a tooth portion 71 formed on the output member 64. Further, the second ratchet 70 is provided with a solenoid 73 as a first releasing means for generating a pushing force in a direction of removing the claw 72 of the second ratchet 70, and the solenoid 73 is connected to the controller 14 via a lead wire 88. Has been done. The plunger 74 of the solenoid 73 is normally biased by a spring 75 in a direction in which no force is applied to the second ratchet 70. The plunger 74 has a rod 76, and when the solenoid 73 is energized, it presses the concave portion 77 of the second ratchet 70, and the second ratchet 70 and the output member 64.
Unlock the.

The output member 64 is provided with a spring 78 for pressing the output member 64 in the return direction, and the actuator housing 69 is provided with a switch 79 for detecting the return position of the output member 64. The switch 79 is connected to the controller 14 via a lead wire 89. The first ratchet 65 and the second ratchet 70 are shown in FIG.
As shown in FIG. 7, springs 81 and 82 for pressing the claws 80 and 72 in the respective directions are provided, and the release cable 8 for releasing both the first and second ratchets 65 and 70.
3 is fixed to a cam 84 as a second releasing means. The cam 84 rotates when the release cable 83 is pulled, and is normally biased by a spring 85 in a direction opposite to the direction in which the force is applied from the release cable 83. On the circumferential surface of the cam 84, slopes 86 and 87 are formed as radius changing parts, respectively. The slope 86 has the first ratchet 65 and the slope 87.
The second ratchets 70 are in contact with each other. When the release cable 83 is pulled, the cam 84 rotates, and the claw 72 of the second ratchet 70 is first removed by the slope 87, and the cam 84
Is rotated further, and the first ratchet 65 is
Remove the claw 80 of.

To remove the claw 80 of the first ratchet 65,
This is because the output member 64 is released from the self-locking action of the worm gear to be free when the cable 10 is returned when the motor 61 fails and cannot be reversed. Next, the operation will be described. When the motor 61 receives a start command from the controller 14, the motor 61 starts to rotate normally, and the cable 10 is pulled via the worm gear, the drive shaft 62, the drive member 63, the first ratchet 65, the output member 64, the output lever 67, and the limit switch 11. When the cable pulling force reaches the set value, the limit switch 11 issues a signal, and the motor 61 is stopped by a command from the controller 14. Here, by the self-locking action of the worm gear and the second ratchet 70, the cable 10 can be securely held without being loosened even when the vehicle body vibrates.

The cable 1 is instructed by the controller 14
In order to return 0, first, the solenoid 73 is excited and one end of the second ratchet 70 is pushed by the tip of the plunger 74 to make the second
After the pawl 72 of the ratchet 70 is removed, the motor 61 starts reverse rotation to return the cable 10 and the output member 64 returns to its original position, and the switch 79 issues a signal to cause the controller 1
The motor 61 is stopped by the command from 4. Here, when the second ratchet 70 is removed, the self-locking force of the worm gear overcomes the pulling force from the cable 10 side and the force of the spring 78 that biases the output member 64, so that the cable 1
Prevents 0 from being returned suddenly. At the same time, the second
Since the force required to remove the pawl of the ratchet 70 is small, there is also an advantage that the solenoid 73 can be downsized. The second ratchet 70 may be removed by using a small motor instead of the solenoid 73.

Solenoid 7 with cable 10 pulled out
3 or output cable 10 when motor 61 fails
To release the cable, pull the release cable 83 manually. When the release cable 83 is pulled, the cam 84 rotates, and the inclined surface 87 on the outer periphery of the cam 84 causes the pawl 72 of the second ratchet 70 to move first.
When the cam 84 is further rotated and the claw 80 of the first ratchet 65 is removed by the inclined surface 86, the cable 10 is returned by the pulling force from the cable 10 side and the force of the spring 78 that biases the output member 64. Here, an advantage that the operation of pulling the release cable 83 is smoothly performed by first removing the second ratchet 70, which requires less force to remove the ratchet pawl, and then removing the pawl 80 of the first ratchet 65. There is.

In this way, high reliability, high durability and high fail-safety can be obtained.

[0026]

As described above, since the parking brake holding force can be sufficiently ensured, high reliability and high durability can be obtained. Further, when the motor cannot rotate in the reverse direction due to a failure of the motor or the like, the brake cable can be surely returned, so that a high fail-safe property can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of an actuator according to the present invention.

FIG. 2 is a view on arrow A-O-B of FIG.

FIG. 3 is a view on arrow C-C in FIG.

[Fig. 4] Overall configuration diagram

[Fig. 5] Limit switch configuration diagram

[Explanation of symbols]

 1, 2: Brake unit 3, 4, 6, 8, 10: Cable 5: Equalizer 7: Connector 9: Parking brake lever 11: Limit switch (switch means) 12: Actuator 13: Output lever 14: Controller (control means) 15: Manual switch 16: Rear door opening / closing switch 17: Transmission position switch 18: Clutch release switch 19: Detection means 20: Brake pedal 21: Master cylinder 22: Brake pipe 31: Case 32: Plug 33: Lever connecting hole 34: Contact 35: Switch 36, 88, 89: Lead wire 37: Cylinder chamber 38: Plunger 39: First spring 40, 41: Washer 42: Liquid pressure chamber 43: Inlet port 44: Liquid passage 45, 46: Oil seal 47: Snap ring 48 Rod 49: Large diameter part 50: Retainer 51: Second spring 61: Motor (rotational force generating means) 62: Drive shaft 63: Driving member 64: Output member 65: First ratchet (first locking means) 66: Output shaft 67: Output lever 68: Bearing 69: Actuator housing 70: Second ratchet (second locking means) 71: Tooth portion 72: Claw 73: Solenoid (first releasing means) 74: Plunger 75: Spring 76 : Rod 77: Recess 78: Spring 79: Switch 80: Claw 81, 82: Spring 83: Release cable 84: Cam (second releasing means) 85: Spring 86, 87: Slope (radius change part)

Claims (2)

[Claims] 1. An actuator for outputting a cable pulling force of a parking brake, a detecting means for detecting a driving state of a vehicle, a control means for driving and controlling the actuator according to a signal from the detecting means, and a cable pulling service. What is claimed is: 1. A parking brake operating device, comprising: a switching device that outputs a signal in proportion to a brake fluid pressure when a cable pulling force exceeds a predetermined value, wherein the actuator generates a rotational force and a parking force generating device. An output member that transmits a pulling force to the cable of the brake, and a first locking unit that transmits the rotation of the rotational force generation unit to the output member and prevents the output member that faces the rotational force generation unit from reversing. Second locking means for preventing the output member from returning to the vehicle body, and a first solution for releasing the second locking means. Means and the operation device of the parking brake, characterized in that a second release means for releasing both of said first and second locking means. 2. The first and second locking means are each constituted by a ratchet, and the second releasing means has a radius changing portion on a circumferential surface which abuts against the two ratchets. It is composed of a cam, and the ratchet of the first locking means is first released after the ratchet of the second locking means is released by the change of the radius of the circumferential surface due to the rotation of the cam. The parking brake operating device according to claim 1.