JPH05139269A - Parking brake operating device - Google Patents

Abstract

PURPOSE:To obtain high reliability and durability at a low cost at the time of performing automatic control by making the cable pulling force of a parking brake proportional to the liquid pressure of a service brake, and outputting an 'off' signal by a control means when the cable pulling force exceeds the specified value. CONSTITUTION:Brake units 1, 2 are connected to an actuator 12 through cables 3, 4 and 10. When an operation command is sent to a controller 14 from a manual switch 15, the motor of the actuator 12 pulls the cable 10 through a limit switch 11. In the non-depressed state of a service brake, the switch is turned off when the cable pulling force exceeds the set load, so that the actuator 12 is stopped through the controller 14. In the depressed state of the brake, the cable pulling force is controlled to the force proportional to the liquid pressure of the service brake, and the actuator 12 is stopped when the cable pulling force exceeds the value obtained by adding braking liquid pressure to the set load.

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. 145658/1984.
2. Description of the Related Art There is known a vehicle in which an operating state of a parking brake is controlled by detecting a tilted state of a vehicle. That is, this device includes electromagnetic means for actuating and releasing the parking brake of the vehicle, a gradient sensor for detecting at least the inclination state of the vehicle, a sensor group for detecting the operating state of the vehicle, and a sensor group from the sensor group. A controller that receives a signal and outputs a brake operation command signal and a brake release command signal to the electromagnetic means, and a signal from a gradient sensor of the above sensor group, receives a signal from the electromagnetic means when the parking brake operation control is performed. And a parking brake actuation force variable control means for performing variable control according to the degree.

[0003]

However, in such a conventional parking brake operating device,
If the inclination state of the vehicle has to be detected and the operating force is controlled based on that, there is a problem that the detection and control system is complicated, the manufacturing cost becomes high, and it is difficult to secure reliability.

When the parking brake operating force is made constant without performing the operating force control, if the set value is low, the braking force becomes insufficient on a slope, and conversely if the set value is increased to the required braking force on a slope. However, there is a problem that the parking brake is always operated with a large operation force, which adversely affects the durability of the actuator and the brake unit.

The present invention has been made in view of the above-mentioned conventional problems, and obtains low cost, high reliability and high durability when automatically controlling the operating force of the parking brake. An object of the present invention is to provide a parking brake operating device that can be used.

[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. A control means for driving and controlling the actuator by means of, and provided between the actuator and the cable of the parking brake,
The cable pulling force is proportional to the service brake hydraulic pressure, and a switch means is provided for outputting an off signal to the control means when the cable pulling force exceeds a predetermined value.

[0007]

[Function] When the parking brake operation of a taxi or the like is automated, it is required to be automatically operated when the passenger gets on and off, and particularly when the passenger gets on and off the slope, the service brake (normal foot brake) is depressed. In this state, operate the open / close switch on the rear door. That is, if the parking brake is automatically operated in conjunction with the opening / closing switch of the rear door, the information about the braking force required on the slope can be obtained from the service braking force, that is, the brake fluid pressure.

When the opening / closing switch of the rear door is operated while the brake pedal is not stepped on, it can be interpreted as a flat road surface. Therefore, it is sufficient to control to a small parking brake operation force required on a flat road. .. In the present invention, switch means (limit switch) is provided between the actuator and the cable of the parking brake to make the cable pulling force proportional to the service brake hydraulic pressure, and when the cable pulling force exceeds a predetermined value, an off signal is output. To stop the actuator.

By controlling the cable pulling force in proportion to the hydraulic pressure of the service brake in this way, the required parking brake force can be secured and an excessive pulling force can be avoided. As a result, the durability of the actuator and the brake unit can be improved.

Further, since the structure is simple, the cost can be reduced and the reliability can be improved.

[0011]

Embodiments 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 configuration will be described. In FIG. 1, reference numerals 1 and 2 denote a pair of brake units.
2 is 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 arm 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 includes the cable 10 and the actuator 1.
It is provided at the connecting portion of the second arm 13.

The actuator 12 outputs a cable pulling force for pulling 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, brake fluid pressure corresponding to the pedaling 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. 2, the limit switch 11 has a case 31 and a plug 32 fixed to the case 31. The plug 32 is connected to the arm 13 of the actuator 12 through the arm connecting hole 33, and the switch 35 having the contact 34 therein.
Is stored. 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, one end of which is fixed with the cable 10 inserted therein, and the other end of which is a retainer 50.
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 operation will be described. For example, when an operation (normal rotation) command is issued from the controller 14 by a signal from the manual switch 15, the motor of the actuator 12 is operated and the arm 13 starts pulling the cable 10 via the limit switch 11. At this time, if the service brake is not stepped on, the first spring 39 bends when the cable pulling force exceeds the set load of the first spring 39, the plunger 38 moves with respect to the case 31, and the switch 35 is turned off. The controller 14 issues a command to stop the operation, and the actuator 12 stops.

That is, the cable pulling force is controlled to the value of the set load of the first spring 39. When the service brake is stepped on, the brake fluid pressure acts on the plunger 38, which is the same as adding the fluid pressure to the set load of the first spring 38.

That is, the cable pulling force is controlled in proportion to the hydraulic pressure of the service brake, and the parking brake is operated by the force added to the set load of the first spring 39. The cable pulling force is the first spring 39
When the value obtained by adding the brake fluid pressure to the set load is exceeded, the first spring 39 bends, the plunger 38 moves with respect to the case 31, the switch 35 turns off, and the controller 14 issues an operation stop command. , The actuator 12 is stopped.

Further, even when the hydraulic pressure of the service brake exceeds a certain value on a steep slope or the like, the cable pulling force is controlled in proportion to this hydraulic pressure. When the cable pulling force exceeds the set load of the second spring 51, the second spring 51 bends before the plunger 38 moves,
The switch 35 is turned off and the actuator 12 is stopped. That is, the maximum operating force of the parking brake is determined by the set load of the second spring 51.

As described above, when the parking brake is automatically operated, by controlling the cable pulling force proportional to the hydraulic pressure of the service brake, it is possible to secure the necessary parking brake force and it is also excessive. It is possible to avoid the pulling force. Therefore, the actuator 1
2 and the brake units 1 and 2 can be ensured in durability.

Also, the actuator 12 and the cable 10
Since the limit switch 11 is provided at the connecting portion of the above, the detection and control system can be simplified, the cost can be reduced, and the reliability can be improved. Next, FIG. 3 is a diagram showing another embodiment of the present invention. In FIG. 3, reference numeral 23 denotes a hydraulic pressure sensor as a hydraulic pressure detecting means. The hydraulic pressure sensor 23 detects the brake hydraulic pressure from the master cylinder 21 due to the depression of the brake pedal 20, and outputs a detection signal to the controller 14. ..

When the controller 14 receives from the hydraulic pressure sensor 23 a signal indicating that the brake hydraulic pressure has been detected, the controller 14 controls the actuator 12 so that the brake pulling force of the parking brake is proportional to the brake hydraulic pressure. Also in this embodiment, the same effect as that of the above embodiment can be obtained. It is needless to say that both of the above-described two embodiments include not only the parking brake force that changes in an analog manner in proportion to the service brake force but also the one that controls stepwise.

[0026]

As described above, according to the present invention, since the cable pulling force proportional to the hydraulic pressure of the service brake is controlled when the parking brake is automatically operated, the required parking brake is obtained. The force can be secured and an excessive pulling force can be avoided, and as a result, the durability of the actuator and the brake unit can be improved. Further, since the structure is simple, the cost can be reduced and the reliability can be improved.

[Brief description of drawings]

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

[Fig.2] Limit switch configuration diagram

FIG. 3 is a diagram showing another embodiment of the present invention.

[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: Arm 14: Controller (control means) 15 : Manual switch 16: Rear door open / close switch 17: Transmission position switch 18: Clutch release switch 19: Detection means 20: Brake pedal 21: Master cylinder 22: Brake pipe 23: Fluid pressure sensor (fluid pressure detection means) 31: Case 32 : Plug 33: Arm connection hole 34: Contact point 35: Switch 36: Lead wire 37: Cylinder chamber 38: Plunger 39: First spring 40, 41: Washer 42: Hydraulic chamber 43: Inlet port 44: Liquid passage 45, 46: Oil seal 47: S Ppuringu 48: Rod 49: Large diameter portion 50: retainer 51: second spring

Claims (2)

[Claims] 1. An actuator for outputting a cable pulling force of a parking brake, a detection means for detecting a driving state of a vehicle, a control means for driving and controlling the actuator by a signal from the detection means, the actuator and the parking. A switch means is provided between the cables of the brake, which makes the cable pulling force proportional to the service brake fluid pressure and outputs an off signal to the control means when the cable pulling force exceeds a predetermined value. Parking brake operating device. 2. An actuator for outputting a cable pulling force of a parking brake, a detection means for detecting a driving state of a vehicle, a control means for driving and controlling the actuator by a signal from the detection means, and a service brake hydraulic pressure. An operating device for a parking brake, comprising a brake fluid pressure detecting means for detecting and outputting a detection signal to a control means, and controlling the cable pulling force so as to be proportional to the service brake fluid pressure.