JP2000255397A - Parking brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manually and reliably release a brake and to prevent generation of large collision sound in releasing of a brake by an electric actuator without using a shock absorber. SOLUTION: A brake holding mechanism for holding a brake pedal 14 manually operated to the brake position returns the brake pedal 14 at the operating speed corresponding to the operating amount in which the free end 23a of a coil spring 23 is released by an operating plate 26. A stepping motor 30 releases the free end 23a by being operated in a state where the operating plate 26 is interlocked through a spur gear 32 and a gear part 34. When the specified operation can not be performed to the stepping motor 30, if a release cable 27 is manually operated, the operating plate 26 mechanically and reversely drives the stepping motor 30 through the spur gear 32 from outside and also releases the free end 23a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking brake device capable of releasing the brake state of a parking brake provided in a vehicle or the like by electric control.

[0002]

2. Description of the Related Art Hitherto, as a parking brake device for a vehicle, there has been proposed a device in which a parking brake is automatically released under a predetermined condition when traveling starts from a state where the parking brake is applied. I have. This type of parking brake device releases, for example, the brake state of the brake mechanism that applies the left and right brakes when the shift lever is switched from the parking position to the traveling position and the accelerator pedal is depressed by a predetermined amount or more. I do. In these parking brake devices, when the brake release condition is satisfied, the electric actuator or the negative pressure actuator is operated to release the brake state of the brake mechanism.

When the brake mechanism is operated by a negative pressure actuator, it is necessary to draw a negative pressure pipe from a negative pressure pump in an engine room to a negative pressure actuator in a vehicle room. In this case, it is necessary to provide a hole for piping in a partition plate separating the engine room and the vehicle room, so that noise of the engine room easily enters the vehicle room. Therefore, electric actuators tend to be used so that the driver does not feel discomfort due to noise.

An example of a parking brake device in which the brake state is released by an electric actuator is disclosed in, for example, Japanese Patent Application Laid-Open No. Sho 59-134037. As shown in FIG. 9, the parking brake device is used to manually set and release the brake.
A ratchet 61 pulled by the brake operation of the brake pedal 60 and a spring 62 biased to mesh with the moving ratchet 61,
A pawl 6 whose engagement with the ratchet 61 is released by a release operation by a release knob 63 that is manually operated.
4 is provided. Further, in order to automatically set and release the brake, the parking brake device operates the brake pedal 60 during braking, and operates the pawl 64 to release the engagement with the ratchet 61 when releasing the brake. It has a mechanism. The electric mechanism is
The worm wheel 66 is rotatably supported on the support shaft 65 of the brake pedal 60, the worm 68 is provided on the output shaft of the electric motor 67 and meshes with the worm wheel 66, and the worm wheel 66 is provided on the worm wheel 66. In the state of being turned into the brake state, the guide part 69 and the like for moving the pawl 64 so as not to mesh with the ratchet 61 are provided. Then, when the worm wheel 66 is rotated by the electric motor 67 in a direction opposite to that during braking when the brake is released, the return spring 70 and the brake pedal 60 due to the brake reaction force are allowed to return. At this time, the pawl 64 is moved by the guide portion 69 so that the ratchet 61 can be moved by rotating the brake pedal 60.
It is held at a position where it does not mesh with.

According to such a parking brake device,
The brake can be set and released automatically, and there is no need to provide a hole for passing negative pressure piping in the partition wall between the engine room and the vehicle room, so that noise is not increased. Can be.

[0006]

However, in the above-described parking brake device, when the electric motor cannot be operated normally in a state where the brake is automatically applied, the brake state cannot be manually released. .
This is because a worm gear that can obtain a high reduction ratio is used to directly drive the support shaft 65 of the brake pedal 60. Further, even if the electric motor 67 cannot operate normally, the guide portion 69 remains in the state where the brake pedal 60 is operated.
Therefore, there are cases where the brake cannot be released even by manual operation, and there is a problem that the usability is insufficient.

In order to solve such a problem, the present applicant can manually set and release the brake and release the brake automatically, and operate the electric actuator normally in a state where the brake is applied. We have devised a parking brake device that can reliably release the brakes manually even if it is no longer possible. This parking brake device is provided with only an electric actuator for removing the pawl 64 from the ratchet 61 when the brake is automatically released, instead of the electric mechanism in the parking brake device. This electric actuator is a direct-acting output shaft for driving a door lock mechanism, and includes an electric motor, a reduction mechanism, and an output shaft of the electric motor and an input shaft of the reduction mechanism inside a casing. A centrifugal clutch, a cylindrical cam rotationally driven by a speed reduction mechanism, an operating shaft driven straight forward and backward by the cylindrical cam, a return spring for returning the operating shaft to its original position when the operation is stopped, and the like. The centrifugal clutch transmits the output of the electric motor from the output shaft to the operating shaft only when the electric motor operates at a predetermined rotation speed. When the electric motor stops, the operating shaft is driven by the biasing force of the return spring. To return to the original position. And
When the electric power is supplied to the electric motor when the brake state is released, the operating shaft is immersed, and the pawl 64 is disengaged from the ratchet 61 by the operating shaft. As a result, the ratchet 61 and the brake pedal 60 are returned to their original positions by the return spring 70, and the brake state is released. When the power supply to the electric motor is stopped when the brake state is released, the output shaft is returned to the original position by the return spring, and the pawl 64 is returned to the position where the pawl 64 is engaged with the ratchet 61, so that the manual brake setting can be performed. It is possible. Therefore, the brake is set only manually, and the operating shaft of the electric actuator operates the pawl 64 only when the brake is released, so that it is not possible to control the power supply to the electric motor while the brake is applied. The brake can be reliably released manually.

By the way, in this parking brake device,
The release of the brake by the electric actuator is performed by the ratchet 61 moved by the brake operation of the brake pedal.
This is done by removing the pawl 64 from the position and returning to the original position by the urging force of the return spring 70. As a result, when the brake is released by the electric actuator, the brake pedal 60 forcibly returned to the original position by the return spring collides with the rotation restricting portion (stopper), generating a loud collision sound, and discomfort to the driver. There is a problem giving.

In order to solve such a problem, it is conceivable to provide a pneumatic shock absorber between the brake pedal 60 and the bracket of the brake device for limiting the operation speed when the brake pedal 60 returns. . However, there is a problem that an extra shock absorber is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to control an electric actuator to release a brake.
Even if the electric actuator can no longer be controlled, the electric actuator can be reliably released by manual operation, and a loud collision sound can be prevented from being generated when the brake is released by the electric actuator without using a shock absorber. To provide a parking brake device

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention according to the first aspect of the present invention is operated manually while being urged to perform a return operation, and the brake is braked while being manually operated. The setting operation is performed by the manual operation of the manual brake operating member to be operated, the manual brake operating member is maintained in the state of being manually operated, and the manual brake operating member is released by the manual operation of the manually operated brake releasing member. A brake holding mechanism that allows the manual brake operating member to return at an operation speed according to the operation amount of the brake actuator, and an electric actuator that is controlled to perform a predetermined operation for releasing the brake holding mechanism. The brake holding mechanism and the electric actuator are provided with a brake holding mechanism when the electric actuator performs a predetermined operation. The brake is released by the manual operation of the manual brake release member regardless of whether or not the mechanism is capable of releasing the mechanism at the operation speed corresponding to the operation speed of the predetermined operation, and whether or not the electric actuator can perform the predetermined operation. A parking brake that is drivingly connected to allow the release operation of the holding mechanism and to allow the brake holding mechanism to return to the state before the release operation when the manual brake release member is no longer manually operated. Device.

According to a second aspect of the present invention, a brake operation is performed from an initial position to a brake position by manual operation.
A manual brake operating member for performing a brake operation of a brake at a brake position, and an operating member returning means for urging the manual brake operating member to return from the brake position to an initial position when the manual brake operating member is no longer operated The manual brake operation member is manually operated to the brake position, and the setting operation is performed. The manual brake operation member is held at the brake position against the urging force of the operation member return means. When the release operation unit provided for releasing the holding state is released, the manual brake is operated at an operation speed corresponding to an operation amount by which the release operation unit is released by the urging force of the manual operation return unit. A brake hold that allows the operating member to return from the brake position to the initial position A mechanism, a manual brake release member manually operated to release the brake, a release operation member operated by the manual brake release member to release the release operation portion, and the manual brake release member being manually operated. A release operation returning unit that urges the release operation member so that the release operation unit returns to a state before the release operation is performed, and a predetermined operation for operating the release operation member is performed. And an operating member that is driven and coupled to interlock with a predetermined operation of the electric actuator, and the predetermined operation of the electric actuator causes the operating member to release the release operation section. And an electric release mechanism for operating the release operation member against the urging force of the release operation return means. The removing mechanism operates the release operation member at an operation speed corresponding to the operation speed of the predetermined operation when the electric actuator performs a predetermined operation, and determines whether or not the electric actuator can perform the predetermined operation. Regardless, the operation of the release operation member by manual operation of the manual brake release member is permitted, and the release operation member is returned by the urging force of the release operation return means when the manual brake operation member is no longer manually operated. A parking brake device that is drivingly connected to allow.

According to a third aspect of the present invention, in the second aspect of the invention, the release operation member and the electric release mechanism are drivingly connected such that the release operation member is interlocked with the electric actuator via the operation member. By doing so, the release operation unit is released at an operation speed corresponding to the operation speed of the predetermined operation, and the release operation member operated by the manual operation of the manual brake release member or the release operation return means is provided. By release operation member operated by power,
The electric actuator is mechanically reversely driven from the outside via the operation member, so that the operation and the return operation of the release operation member are permitted.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the brake holding mechanism comprises a drum which rotates in conjunction with the manual brake operating member, and an elastic outer surface of the drum. A coil spring having an inner peripheral surface abutting in a biased state, one end being a fixed end, and the other end being a free end. When the brake is operated to the position, the force with which the inner peripheral surface of the coil spring contacts the outer peripheral surface of the drum is reduced so as to allow the rotation of the drum. When it is attempted to return to the initial position by the urging force of the coil spring, the inner peripheral surface of the coil spring is driven so as to prohibit the rotation of the drum against the urging of the operating member returning means. The free end as the release operation portion is provided so as to increase the force of contact with the outer peripheral surface of the drum, and the outer end surface of the drum is configured such that the force with which the inner peripheral surface of the coil spring abuts the outer peripheral surface of the drum decreases. When the release operation is performed so as to be separated from the drum by an arc-shaped locus, the force with which the inner peripheral surface of the coil spring comes into contact with the outer peripheral surface of the drum is reduced in accordance with the operation amount of the release operation. Formed so as to allow rotation of the drum so that the manual brake operation member returns from the brake position toward the initial position at an operation speed corresponding to the operation amount at which the free end is released by the force. Wherein the electric actuator is a rotary motor that is repeatedly controlled so as to perform a predetermined operation in which an output shaft rotates by a predetermined angle in the same direction, and the operating member includes A gear that is interlocked with the output shaft of the motor, wherein the release operation member is rotatably supported so that the free end of the coil spring can be released, and includes a gear portion with which the gear meshes, The free end of the coil spring is configured to be released by being rotated by the rotation of the gear, and the gear portion and the gear are rotatable via the gear when the release operating member is operated. The motor is formed with a gear ratio that is externally mechanically driven in reverse.

According to a fifth aspect of the present invention, in the second aspect of the invention, the release operation member and the electric release mechanism are operated by the operation member such that the release operation portion is released. Only when is operated, the release operation member is driven and connected to interlock with the electric actuator via the operation member, thereby releasing the release operation portion at an operation speed corresponding to the operation speed of the predetermined operation. In addition, a release operation member operated by manual operation of the manual brake release member, or a release operation member operated by the urging force of the release operation return means, mechanically reverses the electric actuator from the outside via the operation member. It is provided so as to allow the operation and return operation of the release operation member by not being driven.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the brake holding mechanism comprises a drum which rotates in conjunction with the manual brake operating member, and an elastic outer surface of the drum. A coil spring having an inner peripheral surface abutting in a biased state, one end being a fixed end, and the other end being a free end. When the brake is operated to the position, the force with which the inner peripheral surface of the coil spring contacts the outer peripheral surface of the drum is reduced so as to allow the rotation of the drum. When it is attempted to return to the initial position by the urging force of the coil spring, the inner peripheral surface of the coil spring is driven so as to prohibit the rotation of the drum against the urging of the operating member returning means. The free end as the release operating portion is formed so that the force of contact with the outer peripheral surface of the drum is increased so that the force with which the inner peripheral surface of the coil spring contacts the outer peripheral surface of the drum is reduced. When the release operation is performed so as to be separated from the surface by an arc-shaped trajectory, the force with which the inner peripheral surface of the coil spring comes into contact with the outer peripheral surface of the drum is reduced according to the operation amount of the release operation. The biasing force is formed to allow the rotation of the drum so that the manual brake operation member returns from the brake position toward the initial position at an operation speed corresponding to the operation amount at which the free end is released. Wherein the electric actuator is a rotary motor that is controlled so as to sequentially perform a predetermined operation in which an output shaft rotates in a same direction at a predetermined rotation angle unit, and the operation member includes the rotation member. A lever rotatably driven in conjunction with an output shaft of a mold motor, wherein the release operation member is rotatably supported so as to release a free end of the coil spring, and the output shaft is rotated by the predetermined rotation. It is formed so that the free end of the coil spring is released by being rotated by the lever which temporarily contacts when rotating by an angle.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the manual brake operating member is a parking brake pedal provided in a vehicle compartment. The manual brake release member is a release cable pulled by a release knob provided in the vehicle compartment.

(Operation) According to the first aspect of the present invention,
When the manual brake operating member is manually operated, the brake holding mechanism is set and operated, and the manual brake operating member is held with the brake applied. When the electric actuator is controlled to perform a predetermined operation with the brake holding mechanism set and operated, the brake holding mechanism is released at an operation speed corresponding to the operation speed of the predetermined operation. Then
Since the brake release mechanism allows the manual brake operation member to return at the operation speed according to the operation amount of the release operation, the manual brake operation member performs the return operation at the operation speed according to the operation speed of the release operation. When the manual brake release member is manually operated with the brake holding mechanism set and operated, the brake release mechanism is released regardless of whether the electric actuator can be controlled to perform the predetermined operation. When the manual operation of the manual brake operation member is stopped, the brake holding mechanism is allowed to return to the state before the release operation. Therefore, even if the brake cannot be released by causing the electric actuator to perform the predetermined operation, the brake is released by manually operating the manual brake release member. The operation speed at which the manual brake operation member returns to the original state is determined by the operation speed at which the brake holding mechanism is released in accordance with the operation speed at which the electric actuator performs the predetermined operation.

According to the second aspect of the present invention, when the manual brake operating member for operating the brake is manually operated, the brake holding mechanism is set and the manual brake operating member is held in the manually operated state. Is done.
When the electric actuator is controlled to perform a predetermined operation while the brake holding mechanism is set and operated by manual operation of the manual brake operating member, the release operating member is operated by the operating member interlocked with the electric actuator, and the brake holding is performed. The mechanism is released at an operation speed corresponding to the operation speed of the predetermined operation. Further, when the manual brake release member is manually operated in a state where the brake holding mechanism is set and operated by the manual operation of the manual brake operation member, it is determined whether or not the electric actuator can be controlled to perform the predetermined operation. Regardless, the release operation member is operated to release the brake release mechanism, and when the manual brake operation member is no longer manually operated, the release operation member returns to the original state by the urging force of the release operation return means. . Further, when the release operation member is not operated by the manual brake release member or the electric actuator, the release operation member is returned to the original state by the release operation return means, and the brake holding mechanism is brought into a state where a new setting operation can be performed. Therefore, even if the brake cannot be released by operating the electric actuator, the brake is released by manually operating the manual brake release member. The operating speed when the manual brake operating member returns from the brake position to the initial position by the operating member returning means is controlled by the release operating member to release the release operating portion in accordance with the predetermined operating speed of the electric actuator. Determined by operating speed.

According to the invention of claim 3, according to claim 2,
In addition to the operation of the invention described in the above, the release operation member is drivingly connected so as to interlock with the electric actuator via the operation member, so that the release operation member is operated at an operation speed corresponding to an operation speed at which the electric actuator performs a predetermined operation. The part is released. When it is no longer possible to cause the electric actuator to perform a predetermined operation with the brake holding mechanism set and operated, when the manual brake release member is released, the electric actuator is mechanically reversely driven from the outside via the operation member. And the release operation unit is released. or,
When the manual brake operation means is no longer operated, the urging force of the release operation return means mechanically drives the electric actuator from the outside through the operating member and returns to the state before the release operation section was released. I do. Therefore,
The operation speed when the manual brake operation member returns from the brake position to the initial position by the operation member return means is determined by the operation speed at which the brake holding mechanism is released according to the predetermined operation speed of the electric actuator. You.

According to the invention set forth in claim 4, according to claim 3,
In addition to the operation of the invention described in the above, when the output shaft of the rotary motor performs a predetermined operation of rotating by a predetermined angle in the same direction, through a gear and a release operation member interlocked with the output shaft,
The free end of the coil spring is released at an operation speed corresponding to the operation speed of the rotary motor. When the manual brake operation member is manually operated, the rotary motor is mechanically reversely driven from the outside via the spur gear, and the free end of the coil spring is released. Further, when the manual brake operating member is no longer manually operated, the urging force of the releasing operation returning means mechanically reversely drives the rotary motor from the outside via the spur gear, and releases the releasing operation member from the coil spring. It returns to the state before releasing the end. Accordingly, the brake is released by the rotating motor that is repeatedly controlled so that the output shaft rotates in the same direction by the predetermined rotating angle.

According to the invention of claim 5, according to claim 2,
In addition to the operation of the invention described in the above, the release operation member is linked to the electric actuator only when the release operation member is operated by the operation member so that the release operation portion is released, so that the electric actuator performs the predetermined operation. The release operation unit is released at an operation speed corresponding to the operation speed to be performed. When it is no longer possible to cause the electric actuator to perform a predetermined operation while the brake holding mechanism has been set and operated,
When the manual brake release member is released, the release operation portion is released without mechanically reversely driving the electric actuator from the outside via the operation member. Further, when the manual brake operating means is no longer operated, the urging force of the releasing operation returning means prevents the electric actuator from being mechanically reversely driven from the outside via the operating member, and the release operating section is operated before the releasing operation is performed. Returns to the state. Therefore, the operating speed when the manual brake operating member returns from the brake position to the initial position by the operating member returning means is determined by the operating speed at which the brake holding mechanism is released in accordance with the predetermined operating speed of the electric actuator. It is determined.

According to the invention described in claim 6, according to claim 5,
In addition to the operation of the invention described in the above, when a predetermined operation in which the output shaft of the rotary motor rotates by a predetermined rotation angle in the same direction is performed, the release that the lever fixed to the output shaft temporarily abuts is released. The free end of the coil spring is released through the operation member at an operation speed corresponding to the operation speed of the rotary motor. or,
When the manual brake operation member is manually operated, the free end of the coil spring is released while the lever is not operated by the release operation member. Further, when the manual brake operating member is no longer manually operated, the urging force of the releasing operation returning means returns to a state before the releasing operation member releases the free end of the coil spring without releasing the lever by the releasing operating member. . Therefore, the brake is released by the rotary motor that is controlled so that the output shaft sequentially rotates in the same direction at a predetermined rotation angle unit.

According to the invention of claim 7, according to claim 1,
In addition to the functions of the invention according to any one of claims 6 to 6, the parking brake is set by manual operation of a parking brake pedal provided in the passenger compartment, and the parking brake is released by manual operation of a release knob. A parking brake device having the function of the invention according to any one of claims 1 to 6.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment in which the present invention is embodied in a vehicular parking brake device mounted on a vehicle will be described below with reference to FIGS.

FIG. 2 shows a parking brake device 10 for a vehicle. The vehicle parking brake device 10 includes a brake unit 11, a braking force distribution mechanism 12, and a brake 13 as a parking brake device. The brake unit 11 is for setting and releasing the parking brake, and includes a brake pedal 14 as a manual brake operation member that is manually operated to set the parking brake. The brake unit 11 includes a release knob 15 that is manually operated to release the parking brake, and a left and right brake 13 that is manually operated by a brake pedal 14.
Is connected to a brake cable 16 for actuating. The brake force distribution mechanism 12 connects between the brake cable 16 and both brakes 13 provided separately on the left and right tires T, and a brake brake pedal 14
The operating force applied to the brake cable 16 by the manual operation of is distributed equally to the left and right brakes 13.

FIGS. 1, 3, 4, 5, and 6 show the brake unit 11, respectively. The brake unit 11
The vehicle has a bracket 17 fixed to the vehicle. A mounting plate 18 is provided on the bracket 17 so as to be orthogonal to the rotation axis of the brake pedal 14. The mounting plate 18 is 3
It is supported on the bracket 17 by the support shafts 19 and 20. A drum 21 is rotatably supported by the support shaft 19, and a base end of the brake pedal 14 is fixed to an end surface of the drum 21 on the mounting plate 18 side. The drum 21
It rotates in conjunction with the brake pedal 14.

The brake pedal 14 is rotated by a rotation restricting portion (stopper) (not shown) provided on the bracket 17 from the initial position shown in FIGS. Rotation to the direction side is restricted. From the initial position, the brake pedal 14
The brake is operated to the brake position where the brake 13 operates. Further, even if the brake pedal 14 is operated from the initial position to the brake position side by the brake operation by the tension coil spring 22 as operation member return means connected between the bracket 17 and the brake pedal 14, when the brake operation is stopped, the brake pedal 14 is initialized. It is urged to return to the position.

As shown in FIG. 4, an end of a brake cable 16 is connected and fixed to a base end side of the brake pedal 14 with a sheath fixed to a bracket 17. The brake cable 1 is operated so that the brake 13 is operated as the brake pedal 14 is operated from the initial position to the brake position by the brake operation.
6 is to be pulled. The brake position at which the brake 13 operates when the brake pedal 14 is operated by the brake is determined by the time when the brake pad of the brake 13 is pressed against the brake disk to apply a brake of a predetermined size.
Is the position determined by the pulled length.

A coil spring 23 is fitted on the drum 21. The coil spring 23 is provided such that the inner peripheral surface thereof comes into contact with the outer peripheral surface of the drum 21 in a state of being elastically urged, and one end on the back side in FIGS. One end on the near side in each figure is a free end 23a as a release operation portion not fixed to the bracket 17. The free end 23a is shown in FIG.
As shown in FIG. 3, the drum 2 extends from the opening hole 24 provided in the brake pedal 14 to the mounting plate 18 side, and further, as shown in FIG.
Extending away from one. A known brake holding mechanism 25 is configured by the drum 21 and the coil spring 23.

The brake holding mechanism 25 is set and operated by manually operating the brake pedal 14 from the initial position to the brake position. Even when the brake pedal 14 is no longer manually operated, the brake holding mechanism 25 resists the urging force of the tension coil spring 22. Hold the brake pedal 14 at the brake position. When the free end 23a for returning the brake pedal 14 held at the brake position to the initial position is released, the brake holding mechanism 25 operates the brake pedal 14 at an operation speed corresponding to the operation amount of the release operation. From the brake position toward the initial position.

More specifically, the drum 21 and the coil spring 2
3, when the brake pedal 14 is operated from the initial position to the brake position, the force with which the inner peripheral surface of the coil spring 23 abuts the outer peripheral surface of the drum 21 decreases so as to allow the drum 21 to rotate. When the brake pedal 14 that has been operated to the position attempts to return to the initial position by the urging force of the tension coil spring 22, the coil spring 23 is controlled so as to prohibit the rotating operation of the drum 21 against the urging force of the tension coil spring 22. The inner peripheral surface is provided so as to increase the force of contact with the outer peripheral surface of the drum 21. Further, the drum 21 and the coil spring 23 are arranged such that the free end 23a of the coil spring 23 has a reduced contact force between the inner peripheral surface of the coil spring 23 and the outer peripheral surface of the drum 21 as shown by an arrow A in FIG. When the release operation is performed so as to be separated from the outer peripheral surface by an arc-shaped trajectory, the inner peripheral surface of the coil spring 23 depends on the operation amount of the release operation, that is, the distance that the free end 23 a is separated from the outer peripheral surface of the drum 21. Reduces the force of contact with the outer peripheral surface of the drum 21.
Then, the rotation of the drum 21 is permitted by the urging force of the tension coil spring 22 so that the brake pedal 14 returns from the brake position to the initial position at an operation speed corresponding to the operation amount at which the free end 23a is released. It is supposed to.

That is, when the brake pedal 14 is operated to move from the initial position toward the brake position, the coil spring 22
When the brake pedal 14 is rotated in a direction opposite to the winding direction and moved to the brake position and is no longer operated, the brake pedal 14 is returned to the initial position by the tension coil spring 22 so that the drum 21 It is provided so as to rotate in the same direction as the winding direction. The coil spring 23 is connected to the brake pedal 1
When the brake 4 is operated, the drum 21 is elastically deformed so as to slightly expand its inner diameter by frictional resistance with the drum 21, and the frictional resistance with the drum 21 is reduced, thereby allowing the rotation of the drum 21. I have. Also, the coil spring 23
When the brake pedal 14 that has moved to the brake position is no longer operated, it is elastically deformed so as to reduce the inner diameter by frictional resistance with the drum 21 and the frictional resistance with the drum 21 increases, and the rotation of the drum 21 is increased. The brake pedal 14 is regulated and held at the brake position.

An operation plate 26 for releasing the parking brake by releasing the free end 23a of the coil spring 23 is rotatably supported on the side surface of the mounting plate 18 opposite to the brake pedal 14. A release cable 27 as a manual brake release member connected to the parking brake release knob 15 provided in the passenger compartment is connected to the operation plate 26 with one end of the sheath fixed to the mounting plate 18. .
The operation plate 26 is provided on the side surface on the side of the mounting plate 18 with an engagement piece 28 that engages with the free end 23a of the coil spring 23 so as to rotate integrally. The engagement piece 28 presses the free end 23a of the coil spring 23 from the inside when the release cable 27 is manually operated and the operation plate 26 is rotated by a predetermined angle, and an arc-shaped locus from the outer peripheral surface of the drum 21. Is provided so as to release the free end 23a so as to be separated therefrom. In the present embodiment, the operation plate 26 and the locking piece 28
Constitutes a release operation member.

Between the mounting plate 18 and the operation plate 26, when the release cable 27 is no longer released by the release knob 15, the free end 23a of the coil spring 23 returns to the state before the release operation. Is provided with a tension coil spring 29 as a release operation returning means for urging the operation plate 26.

An electric actuator and a stepping motor 30 as a rotary motor are provided between the bracket 17 and the mounting plate 18 so that the center axis of the output shaft 31 is parallel to the rotation axis of the drum 21. The output shaft 31 is fixed so as to overlap the drum 21 in the same central axis direction. The stepping motor 30 is of a PM type having a constant non-excitation holding torque, and has a free end 2 of a coil spring 23.
It has a step angle that is sufficiently smaller than the rotation angle of the output shaft 31 required to rotate the operation plate 26 to release the 3a. The stepping motor 30 has a free end 2
Control is performed such that a predetermined operation of rotating in the same direction by the rotation angle of the output shaft 31 necessary for releasing the operation of the switch 3a is repeated. The output shaft 31 extends through the mounting plate 18 to the operation plate 26 side without interfering with the brake pedal 14, and an operation member and a spur gear 32 as a gear are fixed to a tip portion thereof. Therefore, the spur gear 32 is drivingly connected so as to interlock with the output shaft 31 of the electric stepping motor 30. In the present embodiment, an electric release mechanism 33 is configured by the stepping motor 30 and the spur gear 32.

On the operation plate 26, a spur gear 32 of a stepping motor 30 meshes with a part of the periphery thereof.
Gear part 34 for rotating the operation plate 26 by the rotation of
Is provided. The gear portion 34 is provided only in a range corresponding to the rotation angle of the operation plate 26 necessary for releasing the free end 23a of the coil spring 23. That is, the operation plate 26 and the stepping motor 30 are drivingly connected so that the operation plate 26 is interlocked with the rotation of the output shaft 31 of the stepping motor 30. When the release cable 27 is manually operated by the release knob 15, the gear portion 34 of the operation plate 26 and the spur gear 32 cause the stepping motor 30 to be mechanically reversely driven via the operation plate 26 and the spur gear 32. Gear ratio. In other words, the gear portion 34 of the operation plate 26 and the spur gear 32 are
5, the gear ratio is such that when the release cable 27 is manually operated with a predetermined operating force, the stepping motor 30 can be reversely driven against its non-excitation holding torque. That is, the operation plate 26 and the electric release mechanism 33
Is connected so that the operation plate 26 is interlocked with the rotation of the stepping motor 30, and when the power is not supplied to the stepping motor 30, the release cable 27 is connected.
When the operating plate 26 is operated by operating the operating plate 26 and when the operating plate 26 is operated by the urging force of the tension coil spring 29 in a state where the release cable 27 is not operated, the stepping motor is 30
Is mechanically reversely driven from the outside, the operation of the operation plate 26 based on the operation of the release cable 27, and the operation plate 26 based on the urging force of the tension coil spring 29 when the release cable 27 is no longer operated. Is allowed.

Next, the operation of the parking brake device configured as described above will be described. The stepping motor 30 is controlled by an electronic control unit that performs, for example, fuel injection control, ignition advance control, and the like. The electronic control unit determines whether or not the vehicle is in a driving state based on, for example, each detection signal from a shift lever position switch and an accelerator switch. The electronic control unit does not supply power to the stepping motor 30 when it is determined that the operation is not performed, and does not control the power supply. After performing a predetermined operation of rotating by a predetermined rotation angle at the dynamic speed, the power supply is stopped.

When the brake pedal 14 is braked to apply the parking brake, the drum 21 is allowed to rotate in a direction in which the frictional force received from the coil spring 23 decreases, and the brake pedal 14 is moved toward the brake position. Operate. When the brake pedal 14 is operated toward the brake position and the brake cable 1
6 is pulled, and the brake 13 gradually operates. When the brake pedal 14 is operated to the brake position, the brake 13 is braked.

When the brake operation on the brake pedal 14 that has been operated to the brake position is stopped, the brake pedal 14 attempts to return to the initial position by the urging force of the tension coil spring 22 and the urging force from the braking force distribution mechanism. Then, the drum 21 attempts to rotate in the rotation direction in which the frictional force received from the coil spring 23 increases, so that the rotation is restricted and the brake pedal 14 is held at the brake position. As a result, the brake holding mechanism 25 is set and the parking brake is applied to the brake 13 by the brake unit 11.

When the shift lever is operated to the operating position and the accelerator pedal is depressed while the parking brake is applied, the electronic control unit rotates the stepping motor 30 by a predetermined angle at a predetermined speed. Then, the operation plate 26 rotates in response to the rotation of the stepping motor 30 against the urging force of the tension coil spring 29, and the engagement piece 28 that rotates together with the operation plate 26 rotates the operation speed of the stepping motor 30. End 23a of the coil spring 23 at an operation speed corresponding to
Is released. Then, the coil spring 23 and the drum 2
1 decreases in accordance with the operation speed at which the free end 23a is released, and the drum 2 is driven by the urging force of the tension coil spring 22 and the urging force of the brake force distribution mechanism 12.
1 is allowed, and the brake pedal 14 returns from the brake position to the initial position at an operation speed corresponding to the rotation speed of the stepping motor 30. Therefore, when the parking brake is released by the electric control, the operation speed at the time when the brake pedal 14 performs the return operation is reduced by the stepping motor 3.
The operation speed is determined by the operation speed at which the operation plate 26 releases the free end 23a of the coil spring 23 in accordance with the zero rotation speed.

When the electronic control unit fails, the battery voltage drops, or the power supply line to the stepping motor 30 is broken while the parking brake is being applied, the stepping motor 30 is supplied with power to operate normally. become unable. In this state, when the release cable 27 is manually operated by the release knob 15, the operation plate 26 is rotated, and the stepping motor 30 is mechanically reversely driven from the outside by the spur gear 32 interlocked with the operation plate 26. The free end 23a of the coil spring 23 is released by the mating piece 28. Then, the brake holding mechanism 25 stops holding the brake pedal 14 at the brake position, and the brake pedal 14 returns from the brake position to the initial position.
Therefore, even if it becomes impossible to release the brake by supplying power to the stepping motor 30 and operating it, the brake is released by manually operating the release cable 27.

When the stepping motor 30 operates normally, the electronic control unit controls the stepping motor 30.
When the release cable 27 is manually operated by the release knob 15 without automatically controlling the release of the brake, the operation plate 26 is rotated and the coil spring 2 is
3 is released. Then, the brake holding mechanism 25 stops holding the brake pedal 14 at the brake position, and the brake pedal 14 returns from the brake position to the initial position.

Here, when the operation plate 26 is rotated by the manual operation of the release knob 15, the stepping motor 30 is mechanically reversely driven from the outside by the spur gear 32 interlocked with the operation plate 26. In this case, since the electronic control unit does not determine that the vehicle is in a driving state, power is not supplied to the stepping motor 30. As a result, similarly to the case where the stepping motor 30 cannot be operated in spite of the state in which the electronic control device determines that the vehicle is in a driving state, the stepping motor 30 is externally operated by the operation plate 26 in the same manner. And the free end 23 of the coil spring 23 is
a is released. Then, the brake holding mechanism 25 stops holding the brake pedal 14 at the brake position,
The brake pedal 14 returns from the brake position to the initial position. Therefore, even if the brake can be released by supplying power to and operating the stepping motor 30, the brake is released by manually operating the release knob 15 and operating the release cable 27.

According to the present embodiment described in detail above, the following effects can be obtained. (A) The brake pedal 14 is held at the brake position by the brake holding mechanism 25 that returns the brake pedal 14 from the brake position at an operation speed corresponding to the operation amount of the release operation. Further, an operation plate 26 operated by a release cable 27 operated by manual operation of the release knob 15 or an electrically controlled stepping motor 30 to release the brake holding mechanism 25, and the operation plate 26 is rotated. The stepping motor 30 for operating the spur gear 32 in conjunction with the output shaft 31 is connected to the release knob 15.
When the release cable 27 is manually operated by
The operation plate 26 is operated to release the brake holding mechanism 25.
Is operated, and when the release cable 27 is no longer manually operated by the release knob 15, the urging force of the tension coil spring 29 causes the operation plate 26 to return to the state before the release operation of the free end 23a of the coil spring 23. Allow to return operation.

As a result, even if it is not possible to release the brake by operating the stepping motor 30, the brake is released by manually operating the release cable 27 with the release knob 15. The operation speed at which the brake pedal 14 performs the return operation from the brake position to the initial position depends on the rotation speed at which the stepping motor 30 rotates by a predetermined angle. Determined by speed. Therefore, the parking brake can be released by controlling the stepping motor 30, and even if the stepping motor 30 cannot be controlled, it can be reliably released by manual operation. It is possible to prevent a loud collision sound from being generated when the brake is released by the stepping motor 30 without using the stepping motor.

(B) The operation plate 26 is drivingly connected to the stepping motor 30 via the spur gear 32 so that the brake is held at an operation speed corresponding to the rotation speed of the rotation operation of the stepping motor 30. The free end 23a of the coil spring 23 for releasing the mechanism 25 is released. Further, when the operation plate 26 is operated by manually operating the release cable 27 and when the operation plate 26 is operated by the urging force of the tension coil spring 29 when the release cable 27 is no longer operated, The stepping motor 30 is mechanically reversely driven from the outside via the gear 32.

As a result, the operation speed at which the brake pedal 14 returns when the parking brake is released depends on the rotation speed at which the stepping motor 30 rotates by a predetermined angle. End 23
It is determined by the operation speed at which a is released. By appropriately setting the rotation speed of the stepping motor 30 or the gear ratio between the gear portion 34 of the operation plate 26 and the spur gear 32, it is possible to prevent a loud collision sound from being generated when the parking brake is released. it can. Therefore, output shaft 3
The brake can be released by using a rotation type stepping motor 30 which is repeatedly controlled so that 1 rotates in the same direction by a predetermined rotation angle.

(C) The brake is released by repeatedly controlling the stepping motor 30 to rotate in the same direction by a predetermined rotation angle. Therefore, the vehicle can be driven at an arbitrary rotation speed regardless of the voltage of the vehicle-mounted battery, and the rotation speed can be easily changed. Therefore, even in a parking brake device having a different specification, a loud collision sound is easily generated when the brake is released. It can be prevented from occurring.

(D) A stepping motor 30, which is a rotary motor constituting an electric release mechanism 33, is connected to a brake holding mechanism 25 composed of a drum 21 and a coil spring 23. The output shaft 31 was provided so as to be parallel to the rotation axis of the drum 21 and to overlap the drum 23 in the same central axis direction. Therefore, the power transmission mechanism such as the speed reduction mechanism can be simplified, and the entire brake device can be downsized.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, the operation plate 26, the stepping motor 30, and the spur gear 32 in the first embodiment are used.
The operation plate 40, the stepping motor 41 and the lever 4
The third embodiment differs from the first embodiment only in that the third embodiment has been changed. Accordingly, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only the operation plate 40, the stepping motor 41, and the lever 43 will be described in detail.

An operation plate 40 rotatably supported by the mounting plate 18 is provided with an engagement piece 28 that engages with the free end 23a of the coil spring 23 so as to rotate integrally. In the present embodiment, the operation plate 40 and the engagement piece 28 constitute a release operation member.

Between the bracket 17 and the mounting plate 18,
An electric actuator and a stepping motor 41 as a rotary motor have a center axis of an output shaft 42 of the drum 2.
It is fixed so as to be parallel to one rotation axis. The stepping motor 41 is a PM type having a laminated core,
It has a step angle of 180 °. Stepping motor 4
1 indicates that the output shaft 42 has a step angle 180 in the same direction.
The rotation is controlled sequentially in degrees. Output shaft 42
A lever 43 as an operation member is fixed to the distal end of the lever. The levers 43 are formed so as to extend in mutually opposite directions from the rotation axis of the output shaft 42. Therefore, the lever 43 is drivingly connected so as to interlock with the output shaft 42 of the stepping motor 41. In the present embodiment, the stepping motor 41 and the lever 43 are
4 is constituted.

The operation plate 40 has, at a part of the periphery thereof, a cam portion 45 to which one end of the lever 43 temporarily abuts when the output shaft 42 of the stepping motor 41 rotates 180 °. Is provided. The operation plate 40 is rotated by the rotation of the output shaft 42 so that the lever 43 temporarily comes into contact with the cam portion 45, and the free end 23 of the coil spring 23 is rotated.
a is released. That is, the operation plate 40
The operation plate 40 is connected to the stepping motor 41 via the lever 43 only when the free end 23a of the coil spring 23 is released. Then, when the output shaft 42 rotates by 180 °, the operation plate 40 rotates by releasing the free end 23 a of the coil spring 23 by temporarily contacting the lever 43 with the cam portion 45. Is formed.

That is, the operation plate 40 and the electric release mechanism 44 cause the stepping motor 41 to rotate only when the operation plate 40 is operated by the lever 43 so that the free end 23a of the coil spring 23 is released. Operation plate 40
Are connected so that the free end 23a is released at an operation speed corresponding to the turning operation. The lever 43 is operated by the operation plate 40 operated by the manual operation of the release cable 27 or the operation plate 40 operated by the urging force of the tension coil spring 29 when the release cable 27 is not operated.
The operation of the operation plate 40 is allowed by preventing the stepping motor 41 from being mechanically reversely driven from the outside via the.

Next, the operation of the parking brake device configured as described above will be described. The electronic control unit supplies power so that the output shaft 42 of the stepping motor 41 is maintained at the same rotational position when it is determined that the operation is not to be performed.
After power is supplied so as to rotate, control for supplying power so as to be held at the rotated rotational position is repeatedly performed.

When it is determined that the vehicle is driven while the parking brake is being applied, the electronic control unit rotates the stepping motor 41 by 180 °. The operation plate 40 rotates in response to the rotation of the stepping motor 41 against the urging force of the tension coil spring 29, and depends on the rotation speed of the stepping motor 41 and the lever ratio between the operation plate 40 and the lever 43. The operating plate 40 releases the free end 23a of the coil spring 23 at the operated speed. Then, the brake holding mechanism 25 causes the brake pedal 14 to return from the brake position to the initial position at an operation speed according to the rotation speed of the stepping motor 41 and the lever ratio between the operation plate 40 and the lever 43. Accordingly, the operation speed at which the brake pedal 14 returns when the parking brake is released depends on the rotation speed of the stepping motor 41, the operation plate 40 and the lever 43.
Is determined by the operation speed at which the operation plate 40 releases the brake holding mechanism 25 in accordance with the lever ratio.

When the release cable 27 is manually operated with the release knob 15 in a state where the stepping motor 41 cannot be controlled and operated normally, the operation plate 40
Is rotated, and the free end 23 a of the coil spring 23 is released by the engagement piece 28. On the other hand, since the output shaft 42 temporarily comes into contact with the operation plate 40 when the lever 43 is rotated by 180 °, the stepping motor 41 may be mechanically reversely driven from the outside via the lever 43. Absent.
Then, the brake holding mechanism 25 stops holding the brake pedal 14 at the brake position, and the brake pedal 14 returns from the brake position to the initial position. Therefore,
Stepping motor 41 with brake applied
Even if it becomes impossible to release the brake by supplying power to the power supply, the brake is released by manually operating the release knob 15 and operating the release cable 27.

When the stepping motor 41 operates normally, the electronic control unit controls the stepping motor 41.
When the release cable 27 is manually operated by the release knob 15 without automatically controlling the brake to release the free end 2 of the coil spring 23 by the engagement piece 28 of the operation plate 40.
3a is released. Then, the brake holding mechanism 25
Stops holding the brake pedal 14 at the brake position, and the brake pedal 14 returns from the brake position to the initial position.

Here, when the operation plate 40 is rotated by operating the release knob 15, the free end 23a of the coil spring 23
The operation plate 40 does not come into contact with the lever 43 that comes into contact with the operation plate 40 only when is released, and no externally reversely-driven force is applied to the stepping motor 41 via the lever 43. As a result, when the release cable 27 is operated in the same manner as when the stepping motor 41 cannot be operated normally despite the state in which the electronic control unit determines that the vehicle is in a driving state. , The stepping motor 41 is not mechanically reversely driven from the outside, and the coil spring 23 is
Is released. Then, the brake holding mechanism 25 stops holding the brake pedal 14 at the brake position, and the brake pedal 14 returns from the brake position to the initial position. Therefore, even if the brake can be released by supplying power to and operating the stepping motor 41, the brake is released by manually operating the release knob 15 and operating the release cable 27.

According to the present embodiment described in detail above, the following effects can be obtained in addition to the effect (a) of the first embodiment. (E) As long as the free end 23a of the coil spring 23 is released by the rotation of the operation plate 40, the operation plate 40 is drivingly connected to the stepping motor 41 via the lever 43 so as to interlock. Accordingly, the operation plate 40 releases the free end 23a of the coil spring 23 in accordance with the rotation speed of the 180 ° rotation operation performed by the stepping motor 41, and the operation plate operated by the manual operation of the release cable 27. The stepping motor 41 is not reversely driven from the outside via the lever 43 by the operating plate 40 operated by the urging force of the tension coil spring 29 when the release cable 27 is not operated or the release cable 27 is not operated.

As a result, the operation speed at the time when the brake pedal 14 performs the return operation, the operation plate 40 releases the free end 23a of the coil spring 23 in accordance with the rotation speed of the 180 ° rotation operation performed by the stepping motor 41. Is determined by the operating speed. By appropriately setting the rotation speed of the stepping motor 41 or the lever ratio between the operation plate 40 and the lever 43, it is possible to prevent a loud collision sound from being generated when the parking brake is released. Therefore, the rotation type stepping motor 4 is controlled so that the output shaft 42 is sequentially rotated in the same direction by a predetermined rotation angle unit.
1 can be used to release the brake.

(F) The brake is released by using the stepping motor 41 whose step angle is the predetermined rotation angle of the output shaft 42. Therefore, unlike the DC motor and the brushless motor, it is not necessary to detect the rotation position of the output shaft 42 and perform control based on the rotation position, so that the control content is simple.

Hereinafter, embodiments other than the above-described embodiment embodying the present invention will be listed as other examples. In the first embodiment, the electric release mechanism 33 and the operation plate 26 may be drivingly connected so that the operation plate 26 is interlocked with the rotation of the output shaft 31 of the stepping motor 30. A driving connection form such as a configuration in which the fixed friction wheel slides on a friction portion provided on a part of the peripheral edge of the operation plate 26 may be used.

In the first and second embodiments, the electric actuator is not limited to the stepping motors 30 and 41, and the rotational positions of the output shafts 31 and 42 are detected, and the output is performed based on the detected rotational positions. It may be a DC motor or a brushless motor that is controlled so that the shafts 31 and 42 rotate by a predetermined rotation angle.

In the second embodiment, the operation member operates the operation plate 40 so that the free end 23a of the coil spring 23 is released when the rotary motor rotates by a predetermined rotation angle. The lever 43 is not limited to the lever 43 that is drivingly connected to a motor that rotates by 180 °. For example, the lever may be provided so as to extend in only one direction from the output shaft 42 of the motor that rotates by 360 °, and may be equiangularly spaced from the output shaft 42 of the motor that rotates by 120 ° in three directions. May be a lever formed to extend.

In the first and second embodiments, the stepping motors 30 and 41 are not limited to the PM type, but may be the VR type or the HB type. A brake pedal 14 as a manual brake operating member
However, the method of operating the brake 13 is not limited to the operation by the brake cable 16, and may be a method of operating via hydraulic pressure.

The manual brake release member is a release knob 1
The hydraulic cable is not limited to the release cable 27 that is manually operated directly by the control unit 5, and may be, for example, a hydraulic cylinder that is manually operated indirectly by hydraulic oil supplied by manual operation of the release knob 15.

Not only a parking brake device that releases a brake by automatically controlling an electric actuator,
A parking brake device that releases a brake by electrically controlling an electric actuator based on a manual switch operation may be used.

The parking is not limited to the parking brake device that applies the parking brake by manually operating the brake pedal 14, but the parking brake is applied by the manual operation of the lever provided on the side of the driver's seat or on the dashboard. It may be applied to the middle brake device.

In the following, in addition to the inventions described in the claims, the technical ideas grasped from the above-described embodiment or each example will be described together with their effects. (1) The parking brake device according to claim 7, a release knob provided in a vehicle compartment for manually operating the release cable of the parking brake device, and a brake cable operated by the brake pedal. A parking brake device for a vehicle, comprising: a connected brake force distribution mechanism; and a brake connected to the brake force distribution mechanism and operated by manual operation of the brake pedal. According to such a configuration, the brake is applied by the manual operation of the brake pedal, and the brake is released by the manual operation of the release cable by the release knob.

(2) In the invention according to claim 4,
The rotary motor is a stepping motor having a step angle sufficiently smaller than the predetermined angle. According to such a configuration, since the rotation speed can be easily changed, it is possible to easily prevent a loud collision sound from being generated when the brake is released even in a parking brake device having different specifications.

(3) In the invention according to claim 6,
The rotary motor is a stepping motor having a step angle equal to the predetermined rotation angle. According to such a configuration, since the detection of the rotation position of the output shaft and the control based on the detected rotation position are not required, the control content can be simplified.

(4) In the invention according to claim 4 or 6, the rotary motor is arranged such that a center axis of an output shaft is parallel to a rotation axis of the drum with respect to the drum, and The output shaft is provided so as to overlap the drum in the same central axis direction. According to such a configuration, the power transmission mechanism can be simplified, and the entire brake device can be downsized.

[0075]

As described in detail above, according to the first to seventh aspects of the present invention, the electric actuator can be controlled to release the parking brake, and the electric actuator is controlled. Even if it becomes impossible to release the brake, the brake can be reliably released by manual operation, and a loud collision sound can be prevented from being generated when the brake is released by the electric actuator without using a shock absorber.

According to the fourth and seventh aspects of the present invention, the brake is released by repeatedly controlling the output shaft of the rotary motor to rotate in the same direction by a predetermined rotation angle, and the loud collision noise is released. Can be prevented.

According to the sixth and seventh aspects of the invention, the output shaft of the rotary motor is controlled to rotate sequentially in the same direction at a predetermined rotation angle unit to release the brake and generate a large collision noise. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a brake unit according to a first embodiment.

FIG. 2 is a schematic diagram showing a configuration of a parking brake device.

FIG. 3 is a schematic sectional view of a brake unit not including an operation plate.

FIG. 4 is a schematic sectional view of a brake unit not including a mounting plate.

FIG. 5 is a schematic sectional view of a brake unit not including a brake pedal.

FIG. 6 is a schematic sectional view of the brake unit in an operating state in FIG. 5;

FIG. 7 is a schematic side view showing a brake unit according to a second embodiment.

FIG. 8 is a schematic side view of the brake unit showing an operation state.

FIG. 9 is a schematic side view of a conventional parking brake device.

[Explanation of symbols]

10: parking brake device for vehicle, 11: brake unit as parking brake device, 13: brake, 14
... Brake pedal as a manual brake operating member, 21
... A drum constituting a brake holding mechanism, 22 a tension coil spring as an operating member returning means, 23 a coil spring constituting a brake holding mechanism, 23a a free end as a release operating part, 25 a brake holding mechanism, 26 a releasing operation Operation plate constituting a member, 27 ... Release cable as a manual brake release member, 28 ... Engagement piece constituting a release operation member, 29 ... Tension coil spring as release operation return means, 30 ... Electricity constituting an electric release mechanism Actuator and stepping motor as rotary motor, 3
DESCRIPTION OF SYMBOLS 1 ... Output shaft, 32 ... Spur gear as operation member and gear which comprise an electric release mechanism, 33 ... Electric release mechanism, 34 ... Gear part, 40 ... Operation plate as a release operation member, 41 ... Electric release mechanism An electric actuator and a stepping motor as a rotary motor, 42 ... an output shaft, 43 ...
A lever as an operation member constituting the electric release mechanism.

Claims (7)

[Claims] The manual operation is performed in a state where the brake is biased so as to perform a return operation, and the setting operation is performed by a manual operation of a manual brake operation member (14) for performing a brake operation of a brake (13) in a manually operated state. The brake operation member (14) is held in a manually operated state, and is released by a manual operation of the manually operated manual brake release member (27), and is operated at an operation speed corresponding to the operation amount of the release operation. A brake holding mechanism (25) that allows the manual brake operation member (14) to perform a return operation.
An electric actuator (3) controlled to perform a predetermined operation for releasing the brake holding mechanism (25).
0, 41), and the brake holding mechanism (25) and the electric actuator (30, 41) are provided with the electric actuator (30, 4).
When 1) performs a predetermined operation, the brake holding mechanism (25)
Is released at an operation speed corresponding to the operation speed of the predetermined operation, and regardless of whether the electric actuators (30, 41) can perform the predetermined operation, the manual brake release member ( The manual operation of 14) allows the release operation of the brake holding mechanism (25), and the state before the brake holding mechanism (25) is released when the manual brake release member (27) is no longer manually operated. A parking brake device that is drivingly connected to allow the vehicle to return. 2. A manual brake operation member (1) for performing a brake operation from an initial position to a brake position by manual operation, and performing a brake operation at the brake position.
4) an operation member return means (22) for urging the manual brake operation member (14) so as to perform a return operation from the brake position to the initial position when the manual brake operation member (14) is no longer operated. The setting operation is performed by manually operating the manual brake operation member (14) to the brake position, and the manual brake operation member (14) is held at the brake position against the urging force of the operation member return means (22). When the release operation section (23a) provided to release the holding state of the manual brake operation member (14) is released, the release operation is performed by the urging force of the operation member return means (22). The manual brake operation member (14) returns from the brake position to the initial position at an operation speed corresponding to the operation amount at which the part (23a) is released. A brake retaining mechanism (25) permitting them to a brake (13) hand brake release member which is manually operated to release the (27), is operated by the manual brake release member (27),
A release operation member (26, 28, 28, 40) for releasing the release operation portion (23a); and a release operation portion (23a) when the manual brake release member (27) is no longer manually operated. The release operation member (2) is returned to a state before the release operation.
6, 28, 28, 40) and an electric actuator controlled to perform a predetermined operation for operating the release operation member (26, 28, 28, 40). (30, 41) and the electric actuator (3
Operating members (32, 43) that are driven and connected in conjunction with the predetermined operations of the electric actuators (30, 41).
2, 43) such that the release operation members (26, 28, 28, 40) release the release operation section (23a).
And a motorized release mechanism (30, 32, 41, 43) for operating the release operation returning means (29) against the urging force. The release operation member (26, 28) and the power release mechanism (3)
0, 32, 41, 43) are electric actuators (3
0, 41) performs a predetermined operation, the release operation member (26,
28, 28, 40) at an operation speed corresponding to the operation speed of the predetermined operation.
Regardless of whether the predetermined operation can be performed in 1) or not, the operation of the release operation members (26, 28, 28, 40) by the manual operation of the manual brake release member (14) is permitted, and Release operation members (26, 2) when the manual brake operation member (14) is no longer manually operated.
(8, 28, 40) is a parking brake device that is drivingly connected so as to allow the release operation returning means (29) to return by the urging force. 3. The release operation member (26, 28) and the electric release mechanism (30), wherein the release operation member (26, 28) is connected to the electric actuator (3) via an operation member (32).
0), the release operation portion (23a) is released at an operation speed corresponding to the operation speed of the predetermined operation, and the manual brake release member (2) is released.
Release operation member (2) operated by the manual operation of (7)
6, 28) or a release operation member (26, 28) operated by the urging force of the release operation return means (29), the electric actuator (30) is externally mechanically driven via the operation member (32). 3. The parking brake device according to claim 2, wherein the parking brake device is provided to allow the operation and the return operation of the release operation member by being reversely driven. 4. The brake holding mechanism (25) elastically urges a drum (21) that rotates in conjunction with the manual brake operating member (14) and an outer peripheral surface of the drum (21). In this state, the inner peripheral surface is in contact with the coil spring (23), one end of which is a fixed end and the other end of which is a free end. The drum (21) and the coil spring (23)
When the manual brake operating member (14) is operated from the initial position to the brake position, the drum (21)
The force with which the inner peripheral surface of the coil spring (23) comes into contact with the outer peripheral surface of the drum (21) is reduced so as to allow the rotation of the manual brake operating member (1) operated to the brake position.
4) When the operation member is to be returned to the initial position by the urging force of the operating member returning means (29), the rotating operation of the drum (21) is prohibited against the urging of the operating member returning means (29). The inner peripheral surface of the coil spring (23) is provided so as to increase the force of contact with the outer peripheral surface of the drum (21), and the free end (23) as the release operation portion is provided.
a) The inner peripheral surface of the coil spring (23) is the drum (21)
(21) so that the force of contact with the outer peripheral surface of the drum is reduced.
When the releasing operation is performed so as to be separated from the outer peripheral surface of the drum by an arc-shaped trajectory, the force of the inner peripheral surface of the coil spring (23) contacting the outer peripheral surface of the drum (21) is reduced according to the operation amount of the releasing operation. The manual brake operating member (14) is moved from the brake position toward the initial position at an operation speed corresponding to the operation amount at which the free end (23a) is released by the urging force of the operating portion returning means (29). The electric actuator is formed so as to allow rotation of the drum (21) so as to perform a return operation, wherein the electric actuator performs a predetermined operation in which the output shaft (31) rotates by a predetermined angle in the same direction. The operation member is a gear (32) interlocked with an output shaft (31) of the rotation motor (30), and the release operation member ( 26,28 The gear (32) includes a gear portion (34) that is rotatably supported so that the free end (23a) of the coil spring (23) can be released and that meshes with the gear (32). The free end (23a) of the coil spring (23) is formed to be released by being rotated by rotation of the coil spring (23). The gear portion (34) and the gear (32) are formed by a release operation member (26, 4. The parking brake device according to claim 3, wherein the rotary motor (30) is formed with a gear ratio that is mechanically reversely driven from the outside via the gear (32) when the gear (28) is operated. . 5. The release operation member (28, 40) and the electric release mechanism (41, 43) include the release operation part (23).
Only when the release operation member (28, 40) is operated by the operation member (43) so that the operation a) is released,
The release operation member (28, 40) is drivingly connected to the electric actuator (41) via the operation member (43) so as to interlock with the electric actuator (41), so that the release operation portion ( 23a) is released, and
The release operation member (28, 40) operated by the manual operation of the manual brake release member (27) or the release operation member (28, 40) operated by the urging force of the release operation return means (29) is used. 3. The electric actuator (41) is provided so as to allow the operation and return operation of the release operation member (28, 40) by not being mechanically reversely driven from the outside via the operation member (43).
A parking brake device according to claim 1. 6. A drum (21) that rotates in conjunction with the manual brake operating member (14), and a state in which the brake holding mechanism is elastically urged against an outer peripheral surface of the drum (21). And a coil spring (23) having an inner peripheral surface abutting, one end being a fixed end, and the other end being a free end. The drum (21) and the coil spring (23) are formed by the manual brake operating member (14). When the operation is performed from the initial position to the brake position, the force of the inner peripheral surface of the coil spring (23) contacting the outer peripheral surface of the drum (21) decreases so as to allow the rotation of the drum (21), and the brake is released. When the manual brake operating member (14) that has been operated to the position attempts to return to the initial position by the urging force of the operating member returning means (22), the operating member returning means (2)
The inner peripheral surface of the coil spring (23) is moved so that the rotation of the drum (21) is prohibited against the bias of (2).
The free end (23a) serving as the release operation portion is formed so that the force of contact with the outer peripheral surface of the drum (21) contacts the outer peripheral surface of the drum (21). When the releasing operation is performed so as to be separated from the outer peripheral surface of the drum (21) along an arc-shaped locus so as to decrease the coil spring (23) in accordance with the operation amount of the releasing operation.
The operation speed according to the amount of operation of the free end (23a) being released by the urging force of the operation unit return means (22) by reducing the force of the inner peripheral surface of the drum contacting the outer peripheral surface of the drum (21) The manual brake operation member (14) returns from the brake position toward the initial position.
The electric actuator is controlled so as to sequentially perform a predetermined operation in which the output shaft (42) rotates in the same direction by a predetermined rotation angle unit. The operating member is a lever (43) that is driven to rotate in conjunction with an output shaft (42) of the rotating motor (41), and the release operating member (28, 40) is rotatably supported so that the free end (23a) of the coil spring (23) can be released, and temporarily when the output shaft (42) rotates by the predetermined rotation angle. The parking brake device according to claim 5, wherein the free end (23a) of the coil spring (23) is released by being rotated by the abutting lever (43). 7. The manual brake operation member (14),
Parking brake pedal (14) provided in the cabin of the vehicle
The parking brake according to any one of claims 1 to 6, wherein the manual brake release member is a release cable (27) pulled by a release knob (15) provided in the vehicle compartment. Brake device.