JP2003072527A - Electric parking brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an emergency releasing device of an electric parking brake actuator which can easily release a parking brake by wiring and a switch for releasing an emergency when a brake device is failed and the parking brake cannot be released while the electric parking actuator is operated. SOLUTION: In the electric parking brake device which presses a friction member P disposed on a side of a member D to be braked by the driving force of an electric motor 44 controlled by a control device 3 to perform the braking, connectors 25, 27 and 29 are connected in the middle of a wiring for connecting the electric motor 44 to a power source 23 thereof, a pair of connectors, i.e., the connector 27 (29) on the electric motor 44 side and the connector 25 on the power source 23 side out of the connectors 25, 27 and 29 are directly connected to each other, and the parking brake can be released when the electric motor 44 and the power source 23 are directly connected to each other by the pair of connectors.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric brake device, and more particularly, to an existing electric brake device when the parking brake is being operated by an electric motor and the control device fails to release the parking brake. The present invention relates to an electric brake device that can easily release a puncturing brake by wiring.

[0002]

2. Description of the Related Art Conventionally, as an electric brake device, for example, one described in JP-A-7-89420 is known. This electric brake device has a pair of pads arranged on both sides of the disc and a caliper that presses the pair of pads against the disc to generate a braking force. The caliper is movable in the axial direction of the disc. The so-called floating type is generally adopted. The device includes an electric motor supported by a caliper, a piston moved by the electric motor, a pad arranged on one side of the disc and pressed by the piston, and a pad arranged on the other side of the disc. It is equipped with a caliper that has a claw that presses against this pad. When the motor is driven to move the piston toward the disk and one of the pads is pressed against the disk, the reaction force causes the caliper to move the claw to the disk. It moves in the direction of approaching, the other pad is pressed against the disk by this claw portion, and the disk is pressed from both sides by both pads to exert a braking force.

[0003]

In the above braking device, it is required to release the braking force held in correspondence with the abnormality in the drive circuit (control circuit) of the electric motor after holding the braking force.

[0004]

Therefore, the technical solution adopted by the present invention is that the friction member P disposed on the side surface of the braked member D of the electric motor 44 controlled by the control device 3 is controlled. In an electric parking brake device that presses and brakes with a driving force, connectors 25, 2 are provided in the middle of the wiring connecting the electric motor 44 and its power source 23.
The controller 3 is connected via 7, 29, and a pair of the connectors 25, 27, 29 of the electric motor 44 side connector 27, (29) and the power source 23 side connector 25 are connected. The electric parking brake device is configured to be directly connectable, and is capable of releasing the parking brake when the electric motor 44 and the power supply 23 are directly connected by the pair of connectors. Further, with respect to the member D to be braked, the friction member P disposed on the side surface thereof is controlled by the control device 3 by the electric motor 4
In the electric parking brake device which is pressed and braked by the driving force of 4, the circuit switching means 3 for switching the drive circuit of the electric motor 44 to the direct connection to the power source 23.
4 and an electric parking brake release switch 6 in the circuit that can be switched, and the electric motor 44 of the parking brake is reversely rotated by a signal from the release switch 6. is there. The electric parking brake device according to claim 2, wherein the circuit switching means 34 is configured by a relay.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment according to the present invention will be described. FIG. 1 is a system configuration diagram including a brake device in which an electric parking brake device is incorporated in a hydraulic brake according to the embodiment of the present invention. Is a configuration diagram of a control device incorporated in the system, and FIG. 3 is a sectional view of a brake device incorporating an electric parking brake device.

In FIG. 1, 1 is a hydraulic brake device provided on the left and right front wheels, 2 is a brake device in which an electric parking brake device is incorporated into the hydraulic brakes provided on the left and right rear wheels,
3 is a control device for an electric parking brake device, 4 is a parking brake operation lamp, 5 is a parking brake operation switch, 6 is a parking brake release switch, 7 is a brake pedal, and the solid line in the figure is a hydraulic circuit. The broken line indicates the electric signal circuit.

As shown in FIG. 2, the control device 3 for the electric parking brake device includes an input / output circuit 31 and a control circuit 3.
2. The driving circuit 33 is provided, and when the parking brake operation switch 5 is turned on, the electric motor 44 in the electric parking brake device is operated via the input / output circuit 31, the control circuit 32, and the driving circuit 33 to perform parking. The brake works and the operation lamp 4 lights up. Further, when the parking brake release switch 6 is turned on, the operation lamp 4 is turned off, the electric motor 44 in the electric parking brake device is reversed, and the parking brake is opened.

In this system, when the service brake is operated, when the brake pedal 7 shown in FIG. 1 is depressed, the hydraulic pressure generated in the master cylinder M / C is applied to the front and rear wheels via the hydraulic circuit. 2, the brake pressure in the hydraulic brake having a known mechanism is moved by this hydraulic pressure, and the pad is pressed against the disk to obtain the braking force. When the brake pedal 7 is released, the hydraulic pressure is lost, the pad is separated from the disc, and the brake is released. To operate the parking brake, turn on the parking brake operation switch 5.
When set to N, the electric motor 44 provided in the brake device 2 on the rear wheel side (details of which will be described later) is operated to obtain a braking force.

Next, with reference to FIG. 3, the specific structure of the brake device equipped with the electric parking brake device will be described. The brake device is a caliper 11 that straddles the brake rotor D and the brake pads P arranged axially on both sides thereof. The brake pad P moves toward the brake rotor D by the forward movement of the piston 13, and the claw portion of the caliper moves toward the brake rotor D, thereby sandwiching the brake rotor D as a member to be braked. ,
It is designed to be able to exert the braking force.
A brake piston 13 is slidably arranged in a cylinder 12 formed in the caliper 11, and a dust seal 14 and a hydraulic seal 15 are arranged between the brake piston 13 and the cylinder 12, and a hydraulic seal is provided. 15
Also serves as a return spring for returning the brake piston 13 to the retracted position after the hydraulic brake is activated.
The hydraulic chamber 16 is connected to the above-mentioned master cylinder M / C via a hole 17 formed in the caliper 11.

Further, a ramp body 18 constituting a force transmission conversion mechanism is arranged in the brake piston 13, and the ramp body 18 does not rotate with respect to the brake piston 13 and is in the brake piston 13 in the axial direction of the brake rotor D. It is slidably arranged.

The lamp body 18 is held so as to be rotatable and slidable with respect to the operating shaft 20, and a nut 21 screwed onto the operating shaft 20 is provided inside the lamp body 18.
And a rotating body (ball) 22 forming a ball ramp mechanism is disposed between the lamp body 18 and the nut 21. The lamp body 18, the nut 21, and the ball 22 constitute a force transmission conversion mechanism. The torque plate 40 of the electric parking brake device is coupled to the end of the operating shaft 20.
Includes an elastic body 46, a worm wheel 42, and a worm 4.
The electric motor 44 is connected via a transmission mechanism composed of three parts. And the worm wheel 42 and the worm 43
And constitute a lock mechanism. In addition, 45 in the figure
Is a rotor for pad clearance adjustment.

In this brake device, when the hydraulic brake is operated (during service braking), the hydraulic pressure generated in the master cylinder M / C by the depression operation of the brake pedal 1 flows into the hydraulic chamber 16 formed in the caliper 11. The hydraulic pressure causes the brake piston 13 to move to the left in the figure while bending the seal member 15 to cause a friction member (brake pad).
P is pressed against the member to be braked (brake rotor) D, and by the reaction thereof to the right of the caliper 11, the friction member P on the opposite side is pressed against the member to be braked D, and the member to be braked D is pressed by both pads P, P. Hold it and apply the brakes. When the brake is released, the hydraulic pressure in the hydraulic chamber is released and the brake piston 13 is returned to the retracted position by the return operation of the seal member 15.

When the parking brake is actuated When the parking brake actuation switch 5 is pressed, the electric motor 44 is actuated, and the actuating shaft 20 is actuated via the worm 43, the worm wheel 42, the elastic body 46, and the torque plate 40. Rotates. At the initial stage of the brake operation, the brake clearance between the friction member P and the brake rotor D is not filled,
Since the pressing force between the lamp body 18 and the nut 21 is small, the lamp body 18 is not activated when the ball lamp mechanism is inoperative.
The nut 21 and the nut 21 move together on the operating shaft 20 to the left in the drawing. By this movement, the lamp body 18 contacts the stopper 13b formed on the inner surface of the brake piston 13, the brake piston 13 moves leftward in the figure, moves the brake pad P, and presses the pad P against the brake rotor D. Further, the reaction force at that time causes the caliper 1 to move to the right, and the brake pad P on the other side also moves to clamp the brake rotor D to operate the brake.

When the brake pressing force becomes higher, that is,
When the pressing force from the lamp body 18 to the nut 21 of the force transmission conversion mechanism (ball ramp mechanism) increases, the nut 21 starts to rotate integrally with the operating shaft 20, and the rotation of the nut 21 causes the ball ramp mechanism to operate and not rotate. By moving the lamp body 18 in the state to the left in the figure, a higher braking force can be obtained. A predetermined braking force is generated by the electric current to the electric motor 44. When the electric motor 44 is stopped in the brake operating state, the state is maintained by the lock mechanism including the worm 43 and the worm wheel 42.

When the parking brake release switch 6 is pressed, the electric motor 44 reversely rotates and the torque plate 40 reversely rotates. When the brake is released, the rolling resistance of the ball 22 is smaller than the frictional resistance between the operating shaft 20 and the nut 21, so the ball ramp mechanism first returns to the initial state to reduce the braking force, and then the nut 21 It moves to the right in the figure on the operating shaft 20 in a non-rotating state. The movement also moves the lamp body 18 to the right in the figure to release the brake.

The control device for the electric parking brake described above includes a wiring circuit described below. As shown in FIG. 4, this wiring circuit includes wiring 24 that connects the battery 23 and the control device 3, and wirings 26 and 28 that connect the control device 3 and the electric motor 44 in the electric parking brake device.
Is equipped with. In the wiring 24 connecting the battery 23 and the control device 3, the male side is connected to the battery 23 side and the control device 3
The first connector 25 having a female side is arranged on the side
The battery 23 and the control device 3 are connected via the connector 25. Similarly, in the wirings 26 and 28 between the control device 3 and the electric motor 44, the second connectors 27 and 29 having the male side on the control device 3 side and the female side on the electric motor 44 side are arranged. The control device 3 and the respective electric motors 44 are connected by the second connectors 27 and 29. Then, the first connector 25 and the second connector 2
7 and 29 are configured as connectors that can be assembled according to the same standard, and are placed in a less conspicuous place in the vehicle body and at a position where they can be easily operated (for example, in a trunk room or a glove box inside the vehicle at an appropriate position). To do.

In this wiring circuit, normally, when the parking brake operation switch 5 is turned on, the battery 23 and the electric motor 44 are electrically connected to each other via the first connector 25, the control device 3, and the second connectors 27 and 29. Electric motor 4
4 rotates forward and the brake operates. When the parking brake release switch 6 is turned on, the parking brake is released. Further, in this wiring circuit, when an abnormality occurs in the control device 3 and the operating state of the parking brake is not released, the male side of the first connector 25 is connected to the second connector 27 (29) as shown in FIG. Connect to female side. At this time, the + side of the battery is RR- (RL
-), Since the connector terminal on the electric motor 44 side is arranged so that the negative side of the battery is connected to RR + (RL +), the electric motor 44 reversely rotates to release the braking force when both are connected.

Next, the configuration of the control device according to the second embodiment of the present invention will be described. In the first embodiment, the wiring circuit that directly connects the battery and the electric parking brake device via the connector is adopted, but in the second embodiment, the original parking brake release switch 6 is used without any special operation. The feature is that the parking brake can be released by the operation of. 6, a control circuit 32 having an input / output circuit, a drive circuit 33, and a circuit switching means (emergency release relay) 34 are arranged in the control device 3, and the emergency release determined by the control circuit 32 is performed. A relay 34 for use is arranged, and the connection destination of the parking brake release switch 6 is switched between the control circuit 32 and the drive circuit 33.

In this control device, when the control is normal, the emergency release relay 34 is controlled from the control circuit 32 through the input / output circuit, and the release switch 6 is connected to the input / output circuit 31. If the control circuit 32 fails during the operation of the electric parking brake device, the emergency release relay 34 stops operating and switches to the normally closed side, and the release switch 6 is the control coil of the release relay in the drive circuit 33. Directly connected to. Therefore, when the original release switch 6 is pressed, the release relay in the drive circuit 33 is actuated, and the electric motor reversely rotates to release the braking force without the control of the control circuit 32.

Although the embodiment of the present invention has been described above, the circuit switching means is not limited to the relay,
Other configurations that achieve similar functions can be employed. Further, instead of the electric parking brake device, it is possible to implement the present invention by symmetrically using a conventionally known electric brake device. Furthermore, the present invention is not limited to the above-described embodiments, and the present invention can be implemented in any other form without departing from the spirit or main features thereof. Therefore, the above-described embodiments are merely examples in all respects and should not be limitedly interpreted.

[0021]

As described above, according to the present invention,
Even if an abnormality occurs in the control device, a connector is placed in the middle of the wiring between the battery, the electric parking brake device and the control device, and the male side and the female side are placed so that the battery and the electric motor can be connected. The parking brake can be released simply by connecting the connector. Further, when the control device is out of order, the parking brake can be released only by pushing the release switch by disposing the circuit switching means (emergency release relay) so that the release switch and the drive circuit are connected. ,
And so on.

[Brief description of drawings]

FIG. 1 is a system configuration diagram including a brake device including a hydraulic brake device and an electric parking brake device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a control device incorporated in the system.

FIG. 3 is a cross-sectional view of a brake device including an electric parking brake device and a hydraulic brake device.

FIG. 4 is an electrical wiring diagram of a drive circuit at a normal time according to the first embodiment.

FIG. 5 is a wiring diagram when the electric parking brake in FIG. 4 is released.

FIG. 6 is an electrical wiring diagram of a drive circuit according to a second embodiment.

[Explanation of symbols]

1 Hydraulic Brake Device 2 Brake Device Incorporating Electric Parking Brake Device 3 Control Device 4 Actuating Lamp 5 Actuating Switch 6 Release Switch 7 Brake Pedal 11 Caliper 12 Cylinder 13 Brake Piston 14 Dust Seal 15 Hydraulic Seal 16 Hydraulic Pressure Chamber 17 Hole 18 Lamp body 19 Oil passage 20 Operating shaft 21 Nut 22 Rotating body (ball) 31 Input / output circuit 32 Control circuit 33 Drive circuit 40 Torque plate 42 Worm wheel 43 Worm 44 Electric motor

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kimio Takahashi             Akebonobu 19-5 Koamimachi, Nihonbashi, Chuo-ku, Tokyo             Rake Industry Co., Ltd. (72) Inventor Masaaki Tanaka             Akebonobu 19-5 Koamimachi, Nihonbashi, Chuo-ku, Tokyo             Rake Industry Co., Ltd. (72) Inventor Kazuo Kawase             Akebonobu 19-5 Koamimachi, Nihonbashi, Chuo-ku, Tokyo             Rake Industry Co., Ltd.

Claims (3)

[Claims] 1. An electric parking brake device for braking a member to be braked by pressing a friction member arranged on a side surface of the member by a driving force of an electric motor controlled by a control device, wherein the electric motor and a power source thereof are provided. The controller is connected via a connector in the middle of the wiring that connects the connector, and among the connectors, a pair of connectors of the electric motor side connector and the power source side connector are directly connectable, An electric parking brake device, wherein a parking brake can be released when the electric motor and the power source are directly connected by a connector. 2. An electric parking brake device for braking a member to be braked by pressing a friction member disposed on a side surface of the member with a driving force of an electric motor controlled by a control device, wherein a drive circuit of the electric motor is provided. It is characterized in that it has circuit switching means that can be switched to a direct connection to a power source and an electric parking brake release switch in the switched circuit, and the electric motor of the parking brake is reversely rotated by a signal from the release switch. An electric parking brake device. 3. The electric parking brake system according to claim 2, wherein the circuit switching means is a relay.