JP2002276704A - Electric brake device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric brake device for a vehicle capable of surely preventing an action of a brake pad in a direction of separating from a disc by a reaction force from the brake pad in parking brake operation, and of performing a smooth release action in parking brake release operation. SOLUTION: A parking brake drive mechanism 20 includes a rotation plate 21 fixed on a rotation shaft 16 of a drive motor 12 as a drive power source of a brake device, a locking cam 22 locking the rotation plate 21, a motor 23 selectively arrange the locking cam 22 in a lock position or an unlock position. When the rotation shaft 16 rotates to separate the brake pad from the disc, locking projections 21a, 22a of the rotation plate 21 and the locking cam 2 are locked to prevent the rotation shaft 21 from rotating more than that, and when the rotation shaft 16 rotates to press the pad on the disc, lock of the rotation plate 21 and the locking cam is released.

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 for a vehicle using an electric motor as a drive source.

[0002]

2. Description of the Related Art In recent years, various types of vehicle brake devices using an electric motor as a drive source have been proposed. In such a brake device, it is considered to use an electric drive system (electric actuator) instead of using a well-known wire drive system for the parking brake drive mechanism. This is because the known wire drive system has many components and the assembly to the vehicle body is complicated.

[0003]

The brake device is configured to apply a friction member to a rotating body that rotates integrally with the axle to obtain a braking force. Therefore, when the parking brake is operated, it is necessary to maintain a state in which the friction member is pressed against the rotating body by the parking brake driving mechanism.

However, the pressing force of the friction member when it is pressed is an excessive force, so that the reaction force from the friction member is large, and this reaction force may cause the electric actuator to operate in a direction opposite to the direction in which the friction member is pressed against the friction member. Therefore, it is necessary to ensure that the electric actuator does not operate in the reverse direction due to the reaction force.

[0005] This is because the brake pad (friction member) is pressed against the disk (rotating member) in the circumferential direction by the drum brake device in which the brake shoe (friction member) is pressed substantially all around the drum (rotating member). Since the disk brake device that is in pressure contact with a part of the friction member has a higher pressure contact force of the friction member, the above-described reaction force is also large, and in particular, in this disk brake device, it was necessary to ensure that the electric actuator did not operate in the opposite direction. .

In the above-described parking brake driving mechanism, the excessive reaction force acts as described above even when the parking brake is released. Therefore, even if the excessive reaction force acts, the releasing operation can be smoothly performed. Has been requested.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a vehicle electric brake device having a parking brake drive mechanism driven by an electric actuator. Sometimes, the reaction force from the brake pad reliably prevents the brake pad from operating in the direction away from the disc,
An object of the present invention is to provide an electric brake device for a vehicle that can smoothly perform a releasing operation when releasing a parking brake.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises a disk rotating with an axle, and a brake pad for generating a braking force by pressing against each side surface of the disk. A drive motor for rotating a rotating shaft, and bringing the brake pad into and out of contact with the disc based on the rotation of the rotating shaft. A rotating plate having a plurality of locking projections in the circumferential direction, and a locking projection for locking with a locking projection of the rotating plate;
A locking member for locking the locking projection to the locking projection of the rotating plate to prevent rotation of the rotating plate, and a locking position for locking the locking member with the rotating plate, and locking. An electric actuator which is switched to any one of a non-locking position and a non-locking position where the member is separated from the rotating plate, and both locking projections of the rotating plate and the locking member are provided. When the rotating shaft rotates so that the brake pad is separated from the disk, the brake pad is locked to prevent the rotation plate from rotating further in the same direction, and the brake pad is pressed against the disk. As described above, the parking brake driving mechanism has a shape in which the locking between the rotating plate and the locking member is released when the rotating shaft rotates.

According to a second aspect of the present invention, there is provided a disk which rotates together with an axle, a brake pad which presses against each side surface of the disk to generate a braking force, and a rotary shaft which is driven to rotate to rotate the rotary shaft. A drive motor for bringing the brake pad into and out of contact with the disk based on the rotation of the drive motor. A plate and a locking projection for locking with a locking projection of the rotating plate, and the rotation of the rotating plate is prevented by locking the locking projection to the locking projection of the rotating plate. Switching between a locking member and a locking position where the locking member is locked with the rotating plate or a non-locking position where the locking member is separated from the rotating plate and is unlocked. An electric actuator to be arranged, The two locking projections of the locking member are locked when the rotating shaft rotates so that the brake pad is separated from the disc, and prevent the rotating plate from rotating in the same direction any more. A parking brake driving mechanism configured to release the locking between the rotating plate and the locking member when the rotation shaft rotates so that the brake pad is pressed against the disk; and a parking brake operation command. A first step of operating the drive motor such that the brake pad is pressed against the disc with a predetermined pressing force, based on the above, so that the locking member is at the locking position where it is locked with the rotating plate. Parking brake control means for performing a second step of operating the electric actuator and a third step of stopping power supply to the drive motor and the electric actuator , With.

According to a third aspect of the present invention, there is provided a disk which rotates together with an axle, a brake pad which presses against each side surface of the disk to generate a braking force, and a rotary shaft which is rotationally driven to rotate the rotary shaft. A drive motor for bringing the brake pad into and out of contact with the disk based on the rotation of the drive motor. A plate and a locking projection for locking with a locking projection of the rotating plate, and the rotation of the rotating plate is prevented by locking the locking projection to the locking projection of the rotating plate. Switching between a locking member and a locking position where the locking member is locked with the rotating plate or a non-locking position where the locking member is separated from the rotating plate and is unlocked. An electric actuator to be arranged, The two locking projections of the locking member are locked when the rotating shaft rotates so that the brake pad is separated from the disc, and prevent the rotating plate from rotating in the same direction any more. A parking brake driving mechanism configured to release the locking between the rotating plate and the locking member when the rotating shaft rotates so that the brake pad is pressed against the disk; and a parking brake release command. A fourth step of operating the drive motor so that the brake pad comes into pressure contact with the disc, and the electric actuator so that the locking member is at the non-locking position separated from the rotating plate. Parking brake control means for performing the fifth step of operating.

According to a fourth aspect of the present invention, there is provided a disk which rotates together with an axle, a brake pad which presses against each side surface of the disk to generate a braking force, and a rotary shaft which is rotationally driven to rotate the rotary shaft. A drive motor for bringing the brake pad into and out of contact with the disk based on the rotation of the drive motor. A plate and a locking projection for locking with a locking projection of the rotating plate, and the rotation of the rotating plate is prevented by locking the locking projection to the locking projection of the rotating plate. Switching between a locking member and a locking position where the locking member is locked with the rotating plate or a non-locking position where the locking member is separated from the rotating plate and is unlocked. An electric actuator to be arranged, The two locking projections of the locking member are locked when the rotating shaft rotates so that the brake pad is separated from the disc, and prevent the rotating plate from rotating in the same direction any more. A parking brake driving mechanism configured to release the locking between the rotating plate and the locking member when the rotation shaft rotates so that the brake pad is pressed against the disk; and a parking brake operation command. A first step of operating the drive motor such that the brake pad is pressed against the disc with a predetermined pressing force, based on the above, so that the locking member is at the locking position where it is locked with the rotating plate. Performing a second step of operating the electric actuator and a third step of stopping power supply to the drive motor and the electric actuator; A fourth step of operating the drive motor so that the brake pad is pressed against the disk based on a release command; and the electric motor is driven so that the locking member is at the unlocked position separated from the rotating plate. Parking brake control means for performing a fifth step of operating the actuator.

The invention described in claim 5 is the invention according to claim 2 or 4
In the electric brake device for a vehicle described in (1), the parking brake control means stops the power supply to the electric actuator after stopping the power supply to the drive motor in the third step.

The invention described in claim 6 is the third or fourth invention.
In the electric brake device for a vehicle according to (1), when the locking member is disposed at the non-locking position in the fifth step, the parking member is maintained at the non-locking position. Thus, the sixth step of applying a predetermined voltage to the electric actuator is performed.

(Operation) According to the first aspect of the present invention,
When the parking brake is operated, the drive motor is operated so that the brake pad is pressed against the disk with a predetermined pressing force, and then the electric actuator is operated so that the locking member is at the locking position where it is locked with the rotating plate. Due to the reaction force from the brake pad, the rotation shaft of the drive motor tries to rotate so that the brake pad is separated from the disk, but the rotation plate and the both locking projections of the locking member are locked to each other, Further rotation of the rotating shaft in the same direction is prevented.
Therefore, the operation of the brake pad in the direction away from the disk can be reliably prevented. On the other hand, when the parking brake is released, the drive motor is operated so that the brake pad is pressed against the disk, and then the electric actuator is operated so that the locking member is at the non-locking position separated from the rotating plate. In this case, when the rotation shaft of the drive motor rotates so that the brake pad is pressed against the disk, the locking member itself moves away from the rotating plate due to the shape of both the locking projections of the rotating plate and the locking member. . Therefore, the locking member can be easily arranged at the non-locking position separated from the rotary plate by the electric actuator, and the releasing operation of the parking brake can be performed smoothly.

According to the second aspect of the present invention, when the parking brake is operated, the drive motor is operated based on the control of the parking brake control means so that the brake pad presses against the disc with a predetermined pressing force. The electric actuator is operated such that the stop member is at the locking position for locking the rotating plate, and then the power supply to the drive motor and the electric actuator is stopped. The rotating shaft of the drive motor tries to rotate so that the brake pad is separated from the disk by the reaction force from the brake pad, but the rotating plate and the locking projections of the locking member are locked to each other, Further rotation of the rotating shaft in the same direction is prevented. Therefore, the operation of the brake pad in the direction away from the disk can be reliably prevented. On the other hand, when the parking brake is released, the drive motor is operated so that the brake pad is pressed against the disc, and then the electric actuator is operated so that the locking member is at the non-locking position separated from the rotating plate. In this case, when the rotation shaft of the drive motor rotates so that the brake pad is pressed against the disk, the locking member itself moves away from the rotating plate due to the shape of both the locking projections of the rotating plate and the locking member. . Therefore, the locking member can be easily arranged at the non-locking position separated from the rotary plate by the electric actuator, and the releasing operation of the parking brake can be performed smoothly.

According to the third aspect of the present invention, when the parking brake is operated, the drive motor is operated so that the brake pad is pressed against the disk with a predetermined pressing force, and then the locking member is locked with the rotating plate. The electric actuator is operated so as to be at the stop position. Due to the reaction force from the brake pad, the rotation shaft of the drive motor tries to rotate so that the brake pad is separated from the disk, but the rotation plate and the both locking projections of the locking member are locked to each other, Further rotation of the rotating shaft in the same direction is prevented. Therefore, the operation of the brake pad in the direction away from the disk can be reliably prevented. On the other hand, when the parking brake is released, based on the control of the parking brake control means, the drive motor is operated so that the brake pad is pressed against the disc, and then the locking member is set to the unlocked position separated from the rotating plate. The electric actuator is operated. In this case, when the rotation shaft of the drive motor rotates so that the brake pad is pressed against the disk, the locking member itself moves away from the rotating plate due to the shape of both the locking projections of the rotating plate and the locking member. . Therefore, the locking member can be easily arranged at the non-locking position separated from the rotary plate by the electric actuator, and the releasing operation of the parking brake can be performed smoothly.

According to the fourth aspect of the present invention, when the parking brake is operated, the drive motor is operated based on the control of the parking brake control means so that the brake pad presses against the disc with a predetermined pressing force. The electric actuator is operated such that the stop member is at the locking position for locking the rotating plate, and then the power supply to the drive motor and the electric actuator is stopped. Due to the reaction force from the brake pad, the rotation shaft of the drive motor tries to rotate so that the brake pad is separated from the disk, but the rotation plate and the both locking projections of the locking member are locked to each other, Further rotation of the rotating shaft in the same direction is prevented. Therefore, the operation of the brake pad in the direction away from the disk can be reliably prevented. On the other hand, when the parking brake is released, based on the control of the parking brake control means, the drive motor is operated so that the brake pad is pressed against the disc, and then the locking member is set to the unlocked position separated from the rotating plate. The electric actuator is operated. In this case, when the rotation shaft of the drive motor rotates so that the brake pad is pressed against the disk, the locking member itself moves away from the rotating plate due to the shape of both the locking projections of the rotating plate and the locking member. . Therefore, the locking member can be easily arranged at the non-locking position separated from the rotary plate by the electric actuator, and the releasing operation of the parking brake can be performed smoothly.

According to the fifth aspect of the invention, the parking brake control means stops the power supply to the electric actuator after stopping the power supply to the drive motor when the parking brake is operated. Therefore, the locking member may move due to the reaction force from the brake pad after the operation of the drive motor is stopped. However, since the locking member is maintained at the locking position by the electric actuator, both the rotating plate and the locking member are moved. The locking projection can be reliably brought into the locked state, and malfunction can be prevented.

According to the invention described in claim 6, the parking brake control means applies a predetermined voltage to the electric actuator so that the locking member is maintained at the unlocked position when the parking brake is released. Therefore, when the vehicle is traveled with the parking brake released, even if the locking member acts due to the vibration or impact received by the brake device, the position of the locking member can be maintained, and malfunction can be prevented.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an electric disc brake device 1 for a vehicle according to the present embodiment. The brake caliper 2 is supported movably in the axial direction of the axle with respect to a bracket (not shown) that rotatably supports the axle (not shown). In the brake caliper 2, brake pads 4 and 5 are disposed at positions facing the outer side surface 3a and the inner side surface 3b of the disc 3 fixed to the axle, respectively. Brake pad 4 on outer side
Is fixed to the outer side of the brake caliper 2, and the inner brake pad 5 is supported on the inner side of the brake caliper 2 so as to be movable in the axial direction (the direction in which the brake caliper 2 moves toward and away from the disk 3). The brake pad 5 on the inner side is moved toward and away from the disk 3 by the axially moving movement of the output shaft 11 of the brake actuator 10 provided on the inner side of the brake caliper 2.

Then, in such a brake device 1,
When the brake pad 5 on the inner side is pressed against the disk 3 by the operation of the actuator 10, the brake caliper 2 moves to the inner side in the axial direction due to the reaction force generated at that time, and the brake pad 4 on the outer side is pressed against the disk 3. , A braking force is generated. In addition, output shaft 1
A waterproof boot 6 made of an elastic member for preventing infiltration into the inside of the motor 12, which will be described later, is attached to an opening formed between the brake caliper 1 and the brake caliper 2.

The actuator 10 has a drive motor 12 as a drive source. The housing 13 of the drive motor 12 is fixed to the brake caliper 2. The housing 13 has a substantially cylindrical shape, and an annular stator 14 including a core 14a and a coil 14b wound around the core 14a is fixed to an inner peripheral surface of the housing 13. Inside the stator 14, a rotor 15 having a magnet on the outer peripheral surface is rotatably accommodated. Rotor 1
The rotation shaft 16 has a base end rotatably supported by the housing 13 via a bearing 17 and a front end rotatably supported by the brake caliper 2 via a bearing 18.

The rotating shaft 16 has a cylindrical shape. Inside the rotating shaft 16, a deceleration mechanism (not shown) for reducing the rotation of the rotating shaft 16 and a rotational movement of the output shaft 11 are converted into a linear movement (projection movement). And the output shaft 11 are accommodated. Since these mechanisms are well-known mechanisms using a screw shaft, a key, and the like, the description thereof will be omitted.

When the coil 14b of the stator 14 is excited, the rotary shaft 16 rotates together with the rotor 15,
The rotational movement of the rotating shaft 16 is converted into a retracting movement in the axial direction of the output shaft 11. This movement of the output shaft 11 causes the brake pads 4 and 5 to approach and separate from the disk 3 and generate a desired braking force.

As shown in FIG. 1 to FIG.
A parking brake drive mechanism 20 is formed on the base end side of the vehicle. The parking brake drive mechanism 20 includes a rotating plate 21, a locking cam 22 as a locking member, and a parking motor 23 as an electric actuator.

More specifically, the rotating plate 21 is fixed to the base end of the rotating shaft 16 and rotates integrally with the rotating shaft 16. A plurality of saw-tooth-shaped locking projections 21a are formed on the outer peripheral portion of the rotating plate 21 at equal intervals. 2 and 3, each locking projection 21a has a surface in the counterclockwise direction as the locking surface 21b and a surface in the clockwise direction as the slope 21c. The locking surface 21b is a surface that linearly extends in the radial direction of the rotating plate 21, and the inclined surface 21c is a surface that is linearly inclined in the counterclockwise direction toward the outside in the radial direction. In this embodiment, when the brake pads 4 and 5 are pressed against the disk 3, the rotating plate 21 rotates clockwise, and when the brake pads 4 and 5 are separated from the disk 3,
The rotating plate 21 rotates counterclockwise.

The locking cam 22 is formed in an arc shape with a thickness substantially equal to that of the rotary plate 21, and is arranged on the outer peripheral side of the rotary plate 21. The base end of the locking cam 22 is fixed to the rotating shaft 23a of the parking motor 23 so as to rotate integrally therewith. The parking motor 23 is fixed to a support plate 24 fixed to the housing 13,
Is swung at a predetermined angle. At the tip of the locking cam 22,
A locking projection 22a that protrudes toward the rotating plate 21 and locks with the locking projection 21a of the rotating plate 21 is formed. 2 and 3, the locking projection 22a has a clockwise surface as the locking surface 22b and a counterclockwise surface as the slope 2 in FIGS.
2c. The locking surface 22b is a surface extending linearly corresponding to the locking surface 21b, and the inclined surface 22c is an inclined surface corresponding to the inclined surface 21c.

In the parking brake mode (at the time of parking), the locking cam 22 is actuated by the parking motor 23 so that the locking projections 21a, 22a (both locking surfaces 21b, 22).
b) is disposed at a locking position where the locking is performed (see FIG. 3).
That is, in the parking brake mode (at the time of parking), the rotating plate 21 (the rotating shaft 16) is rotated clockwise until the pressing force of the brake pads 4 and 5 against the disk 3 reaches a predetermined value. Then, the locking cam 22 rotates toward the rotating plate 21 by the operation of the parking motor 23, and the locking projections 2
1a, 22a (both locking surfaces 21b, 22b) are located at locking positions where the rotation plate 21 (rotating shaft 16) is prevented from reversing in the counterclockwise direction, that is, the counterclockwise rotation of the drive motor 12. Directional rotation is prevented.

In this case, the rotating plate 21 (rotating shaft 16) tries to reversely rotate in the counterclockwise direction due to the reaction force from the brake pads 4 and 5, but is rotated by the locking projections 21a and 22a. Since the plate 21 cannot rotate in the counterclockwise direction, the pressing force of the brake pads 4 and 5 against the disc 3 is maintained at a substantially predetermined value, and the desired braking force is generated and maintained. In other words, the parking brake is applied,
At this time, both locking projections 21a and 22a (both locking surfaces 2)
1b and 22b), the pressing force acts on each other, so that the locking of the locking projections 21a and 22a is not released, and the power supply to the parking motor 23 is stopped.

When the locking projections 21a, 22a are released in order to release the parking brake, the direction in which the pressing force of the brake pads 4, 5 against the disk 3 is increased, that is, the rotating plate 21 (rotating shaft) 16) is rotated clockwise.
At this time, both locking projections 21a, 22a (both locking surfaces 21a)
b, 22b), there is no mutual pressing force, and both slopes 21c, 22c of both locking projections 21a, 22a.
As a result, the locking cam 22 attempts to rotate in a direction away from the rotary plate 21. Then, the locking cam 22 rotates in a direction away from the rotary plate 21 by the operation of the parking motor 23, and the locking of the locking projections 21a, 22a is released. At this time, the locking cam 22 itself also rotates in the direction away from the rotary plate 21, so that the locking of the locking projections 21a, 22a can be easily released.

On the other hand, in the normal brake mode (during running or stopping), the locking cam 22 is arranged at a non-locking position where the locking projections 21a, 22a are not locked by the operation of the parking motor 23. Then, the drive motor 12 becomes rotatable in both rotation directions (see FIG. 2). In this case, the locking cam 2
2 is a rotary plate 2
It does not rotate in a direction away from the first.
In the normal brake mode, the locking cam 22
Is pressed against the locking member to apply a small voltage (an operation maintaining voltage Vrun described later) to the parking motor 23 so that the locking cam 22 is maintained at the non-locking position, and the weak current is continuously supplied. This is because the locking cam 22 disposed at the non-locking position due to vibration, impact, or the like received by the brake device 1
Is disposed at the locking position to prevent the locking projections 21a and 22a from being locked unexpectedly.

FIG. 4 shows an electrical configuration for driving the brake device 1. The brake device 1 is controlled by a brake controller 30 mounted on a vehicle. The controller 30 receives power supply from a battery 31 of the vehicle.

The controller 30 is connected to a depression amount detection device 32 for detecting the depression amount of the driver's brake pedal, and receives a depression amount detection signal corresponding to the depression amount from the device 32.

The controller 30 is connected to a parking brake operation switch 33. The parking brake operation switch 33 outputs an on / off signal based on the operation of a parking brake operation lever provided on the vehicle, and outputs the on / off signal to the brake controller 30. That is, when the parking brake operation lever is operated to the parking position, the parking brake operation switch 33 outputs an ON signal (parking brake operation signal) to the brake controller 30. When the parking brake operation lever is operated to the parking release position, the parking brake operation switch 33 outputs an off signal (parking brake release signal) to the brake controller 30.
Output to

Then, the controller 30 switches to either the "normal brake mode" or the "parking brake mode" based on the ON / OFF signal from the parking brake operation switch 33. That is, when the parking brake operation switch 33 outputs an ON signal (parking brake operation signal), the controller 30 enters the “parking brake mode”, and when the parking brake operation switch 33 outputs an OFF signal, the controller 30 outputs “normal brake”. Mode ". Brake controller 30
Controls the drive motor 12 and the parking motor 23 according to each mode.

[Normal Brake Mode] Controller 30
Controls the parking motor 23 to dispose the locking cam 22 at the non-meshing position shown in FIG. 2 and to make the drive motor 12 rotatable. In this case, the controller 30 applies a small voltage to the parking motor 23 so that the locking cam 22 is maintained at the position where the locking cam 22 is actuated even when vibrations, impacts, and the like received by the brake device 1 act on the locking cam 22. (Operation maintaining voltage Vr
un) to continue supplying a weak current.

When the amount of stepping increases, the controller 30 rotates the drive motor 12 clockwise in FIG. 2 to cause the output shaft 11 to protrude. Then, the brake pads 4 and 5 are pressed against the disk 3 and the braking force of the brake device 1 increases. On the other hand, when the stepping amount decreases, the controller 30 rotates the drive motor 12 in the counterclockwise direction in FIG. 2 so that the output shaft 11 is immersed. Then, the brake pads 4 and 5 move in a direction away from the disk 3, and the braking force of the brake device 1 decreases.

That is, the controller 30 controls the drive motor 12 on the basis of the depression amount detection signal corresponding to the depression amount of the brake pedal to bring the brake pads 4 and 5 into and out of contact with the disk 3, The braking force of the brake device 1 is controlled by changing the pressing force of the brake pads 4 and 5 with respect to.

[Parking brake mode] When the parking brake operation signal is input, as shown in FIG.
The drive motor 12 is rotated clockwise in FIG. 2 until the pressure contact force (braking force) of No. 5 is equal to or more than a predetermined value, that is, a braking force necessary for parking the vehicle is obtained (first step).

Next, the controller 30 controls the parking motor 23 to rotate the locking cam 22 toward the rotating plate 21 (second step). At this time, the locking projection 22a of the locking cam 22 enters between the locking projections 21a of the rotating plate 21, and the locking cam 22 is disposed at the locking position, or the locking cam 22 is locked. The protruding portion 22a presses the protruding end surface of the locking protruding portion 21a of the rotating plate 21. And the controller 3
0 stops the power supply to the drive motor 12 (third
Steps). Then, the rotating plate 21 (the rotating shaft 16) tries to reversely rotate counterclockwise due to the reaction force from the brake pads 4 and 5.

At this time, the locking projection 22a of the locking cam 22
As shown in FIG. 3, the lock plate 21 is brought into a locked state, and the rotating plate 21 (rotary shaft 16) is turned in the counterclockwise direction. Rotation becomes impossible. On the other hand, the locking projection 22a of the locking cam 22
Presses the protruding end surface of the locking projection 21a of the rotating plate 21, the rotating plate 21 (rotating shaft 16) reverses slightly counterclockwise, and at this time, the locking projection 22a After entering between the locking projections 21a, the locking projections 21a and 22a are locked as shown in FIG.
1 (rotary shaft 16) cannot rotate in the counterclockwise direction.
Accordingly, the output shaft 11 is fixed, and the pressing force of the brake pads 4 and 5 against the disk 3 is maintained at a substantially predetermined value, that is, the parking brake is applied while the desired braking force is generated. Then, the controller 30 stops the power supply to the parking motor 23. At this time, since the pressing force acts on both the locking projections 21a and 22a (both the locking surfaces 21b and 22b), even if the power supply to the parking motor 23 is stopped, both the locking projections 21a and 22a are stopped. , 22a are not released.

When the parking brake release signal is input, the controller 30 firstly controls the drive motor 12 in the direction in which the pressing force of the brake pads 4 and 5 increases, that is, the rotating plate 21.
(Rotating shaft 16) is rotated clockwise (fourth step). This is performed to release the locked state between the rotating plate 21 and the locking cam 22 due to the reaction force from the brake pads 4 and 5. At this time, there is no mutual pressing force acting on both locking projections 21a, 22a (both locking surfaces 21b, 22b), and both slopes 21 of both locking projections 21a, 22a.
The locking cams 22 try to rotate in the direction away from the rotary plate 21 by c and 22c.

The controller 30 controls the parking motor 23 to rotate the locking cam 22 in a direction away from the rotary plate 21 to release the locking of the locking projections 21a, 22a. The locking projections 21a and 22a are arranged at a non-locking position where they do not lock (fifth step). At this time, the locking cam 22 itself also rotates in a direction away from the rotary plate 21, so that the locking of the locking projections 21a, 22a can be easily released. Thus, the controller 30 makes the drive motor 12 rotatable. If the brake pedal is not depressed, the controller 30 rotates the drive motor 12 counterclockwise to separate the brake pads 4 and 5 from the disk 3. In this way, the brake device 1 returns to the state where the normal brake operation can be performed as described above.

The controller 30 controls the brake device 1
A small voltage (operation maintaining voltage Vrun) is applied to the parking motor 23 so that the locking cam 22 is maintained at the position where the locking cam 22 is disposed even if vibrations, impacts, and the like received by the vehicle act on the locking cam 22 (the sixth voltage). Step), the erroneous operation of the brake device 1 is prevented by continuously supplying the weak current.

As described above, the brake device 1 of the present embodiment has the following features. (1) When the parking brake is operated, the drive motor 12 is operated based on the control of the controller 30 so that the brake pads 4 and 5 are pressed against the disk 3 with a predetermined pressure.
Next, the parking motor 23 is operated such that the locking cam 22 is at the locking position where the locking cam 22 is locked with the rotating plate 21, and then the power supply to the drive motor 12 and the parking motor 23 is stopped. The rotating shaft 16 of the drive motor 12 tries to rotate so that the brake pads 4 and 5 are separated from the disk 3 by the reaction force from the brake pads 4 and 5.
The locking projections 21a and 22a of the locking cam 22 are locked to each other, so that the rotation shaft 16 is prevented from rotating in the same direction. Therefore, the operation of the brake pads 4 and 5 in the direction away from the disk 3 can be reliably prevented, and the parking brake can be reliably operated to be brought into a state. On the other hand, when the parking brake is released, the drive motor 12 is operated based on the control of the controller 30 so that the brake pads 4 and 5 are pressed against the disk 3, and then the locking cam 22 is separated from the rotating plate 21. The parking motor 23 is operated to be in the position. In this case, when the rotating shaft 16 of the drive motor 12 rotates so that the brake pads 4 and 5 are pressed against the disk 3, the locking cams are formed by the shapes of the rotating plate 21 and the locking projections 21 a and 22 a of the locking cam 22. 22 itself moves away from the rotating plate 21. Therefore, the locking cam 22 can be easily arranged at the non-locking position separated from the rotary plate 21 by the parking motor 23, and the releasing operation of the parking brake can be performed smoothly.

(2) When releasing the locking of the locking projections 21a, 22a of the rotating plate 21 and the locking cam 22, the locking cam 22
Since the vehicle itself is configured to be separated from the rotating plate 21, even if the parking motor 23 is small, the two locking projections 21a,
22a can be easily released. Therefore,
The size and cost of the brake device 1 can be reduced.

(3) Since the locking surfaces 21b, 22b and the slopes 21c, 22c of the locking projections 21a, 22a are formed linearly, the locking projections 21a, 22a (rotary plate 21, locking cam) are formed. 22) can be easily formed.

(4) When both the locking projections 21a and 22a of the rotating plate 21 and the locking cam 22 are locked, the drive motor 1
2 and the power supply to the parking motor 23 is stopped. In this case, the two locking projections 21a and 22a are pressed against each other by the reaction force from the brake pads 4 and 5, so that both the locking projections 2a and 22a are pressed.
The lock of 1a and 22a does not come off. Therefore, unnecessary consumption of the battery 31 can be reduced.

(5) During the operation of the parking brake, after the power supply to the drive motor 12 is stopped, the power supply to the parking motor 23 is stopped. Therefore, the locking cam 22 may move due to the reaction force from the brake pads 4 and 5 after the operation of the drive motor 12 is stopped, but the locking cam 22 is maintained in the locking position by the parking motor 23. Rotating plate 2
The locking projections 21a and 22a of the locking cam 1 and the locking cam 22 can be reliably locked, and malfunction can be prevented.

(6) When the parking brake is released, a predetermined voltage (operation maintaining voltage Vrun) is applied to the parking motor 23 so that the locking cam 22 is maintained at the unlocked position.
Accordingly, when the vehicle travels with the parking brake released, even if the locking cam 22 is acted upon by the vibration or impact received by the brake device 1, the arrangement position of the locking cam 22 can be maintained,
Malfunction can be prevented. In this case, the predetermined voltage is continuously applied to the parking motor 23. However, since the voltage is small and the parking brake is released, that is, the vehicle can run, the battery 31 is charged once the vehicle runs, and the battery 31 is charged. Has a very small effect.

(7) Since the motor 23 is used as the driving source of the parking brake drive mechanism 20, the parking brake drive mechanism 2
0 can be a relatively simple configuration. The embodiment of the present invention may be modified as follows.

The shapes of the rotating plate 21 and the locking cam 22 in the above embodiment are not limited to these, and may be changed as appropriate. In the above embodiment, the motor 23 is used as the drive source of the parking brake drive mechanism 20, but an electric actuator other than the motor may be used. For example, an electromagnetic solenoid, a torque motor, or a motor with a speed reduction mechanism may be used.

The control of the controller 30 in the above embodiment is not limited to this, and may be changed as appropriate. For example, the operation maintaining voltage Vrun is applied to the parking motor 23 while the parking brake is released, but the voltage may be applied to the parking motor 23 only during traveling.

The configuration of the brake device 1 of the above embodiment is not limited to this, and may be changed as appropriate.
The technical ideas other than the claims that can be understood from the above embodiments are described below.

(A) In the electric brake device for a vehicle according to any one of claims 1 to 6, both the locking projections of the rotating plate and the locking member are arranged such that the brake pad is separated from the disk. So that when the rotation shaft rotates, the rotation plate extends linearly in a direction substantially perpendicular to the rotation direction of the rotation plate so as to prevent the rotation plate from rotating in the same direction. Surface, and a linear inclined surface for releasing the engagement between the rotating plate and the engaging member when the rotating shaft rotates so that the brake pad is pressed against the disc. An electric brake device for a vehicle, comprising:

(B) The vehicular electric brake device according to any one of (1) to (6), wherein the electric actuator is an electric motor. .

[0057]

As described in detail above, according to the present invention,
In an electric brake device for a vehicle provided with a parking brake drive mechanism using an electric actuator as a drive source, a reaction force from a brake pad during operation of a parking brake surely prevents the brake pad from operating in a direction away from a disk. Further, it is possible to provide an electric brake device for a vehicle capable of smoothly performing a releasing operation when releasing a parking brake.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an electric brake device for a vehicle according to an embodiment.

FIG. 2 is a diagram for explaining a parking brake driving mechanism.

FIG. 3 is a diagram for explaining a parking brake driving mechanism.

FIG. 4 is an electric block diagram of the electric brake device for a vehicle.

FIG. 5 is a waveform diagram for explaining the operation of the electric brake device for a vehicle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 3 ... Disc, 3a, 3b ... Side, 4,5 ... Brake pad, 12 ... Drive motor, 16 ... Rotating shaft, 20 ... Parking brake drive mechanism, 21 ... Locking cam as locking member, 2
1a: locking projection, 22: rotating plate, 22a: locking projection, 2
3. Parking motor as electric actuator, 30 ...
Brake controller as parking brake control means.

Claims (6)

[Claims] 1. A disk that rotates with an axle, a brake pad that presses against each side surface of the disk to generate a braking force, and a rotary shaft that is driven to rotate, and the brake pad is rotated based on the rotation of the rotary shaft. A drive motor for bringing the disk into and out of contact with a disk, comprising: a rotating plate that rotates with a rotation shaft of the drive motor and has a plurality of locking projections in a circumferential direction; A locking member having a locking projection for locking with the locking projection, and locking the locking projection to the locking projection of the rotating plate to prevent rotation of the rotating plate; An electric actuator that switches and arranges the stop member to one of a locking position where the locking member is locked with the rotating plate and a non-locking position where the locking member is separated from the rotating plate and is unlocked. Having both a rotating plate and a locking member. When the rotating shaft rotates so that the brake pad is separated from the disk, the brake pad is locked to prevent the rotation plate from rotating further in the same direction, and the brake pad is pressed against the disk. An electric brake device for a vehicle, comprising: a parking brake drive mechanism configured to release the engagement between the rotating plate and the engagement member when the rotation shaft rotates. 2. A disk that rotates with an axle, a brake pad that presses against each side surface of the disk to generate a braking force, and a rotation shaft that is driven to rotate, and the brake pad is rotated based on the rotation of the rotation shaft. A drive motor for bringing the disk into and out of contact with a disk, comprising: a rotating plate that rotates with a rotation shaft of the drive motor and has a plurality of locking projections in a circumferential direction; A locking member having a locking projection for locking with the locking projection, and locking the locking projection to the locking projection of the rotating plate to prevent rotation of the rotating plate; An electric actuator that switches and arranges the stop member to one of a locking position where the locking member is locked with the rotating plate and a non-locking position where the locking member is separated from the rotating plate and is unlocked. Having both a rotating plate and a locking member. When the rotating shaft rotates so that the brake pad is separated from the disk, the brake pad is locked to prevent the rotation plate from rotating further in the same direction, and the brake pad is pressed against the disk. When the rotating shaft rotates, the parking pad is configured to release the locking between the rotating plate and the locking member, and the brake pad is driven by the disk based on a parking brake operation command. A first step of operating the drive motor so as to press against the rotating plate with a predetermined pressing force, and a second step of operating the electric actuator such that the locking member is at the locking position where the locking member is locked to the rotating plate. Parking brake control means for performing a third step of stopping power supply to the drive motor and the electric actuator. Vehicle electric brake device that. 3. A disk that rotates with an axle, a brake pad that presses against each side surface of the disk to generate a braking force, and a rotary shaft that is driven to rotate, and the brake pad is rotated based on the rotation of the rotary shaft. A drive motor for bringing the disk into and out of contact with a disk, comprising: a rotating plate that rotates with a rotation shaft of the drive motor and has a plurality of locking projections in a circumferential direction; A locking member having a locking projection for locking with the locking projection, and locking the locking projection to the locking projection of the rotating plate to prevent rotation of the rotating plate; An electric actuator that switches and arranges the stop member to one of a locking position where the locking member is locked with the rotating plate and a non-locking position where the locking member is separated from the rotating plate and is unlocked. Having both a rotating plate and a locking member. When the rotating shaft rotates so that the brake pad is separated from the disk, the brake pad is locked to prevent the rotation plate from rotating further in the same direction, and the brake pad is pressed against the disk. When the rotation shaft rotates, the parking pad is configured to release the lock between the rotary plate and the locking member, and the brake pad is driven by the disk based on a parking brake release command. A parking brake that performs a fourth step of operating the drive motor so as to be in pressure contact with the motor and a fifth step of operating the electric actuator such that the locking member is at the unlocked position separated from the rotating plate. An electric brake device for a vehicle, comprising: a control unit. 4. A disk that rotates with an axle, a brake pad that presses against each side surface of the disk to generate a braking force, and a rotary shaft that is driven to rotate, and the brake pad is rotated based on the rotation of the rotary shaft. A drive motor for bringing the disk into and out of contact with a disk, comprising: a rotating plate that rotates with a rotation shaft of the drive motor and has a plurality of locking projections in a circumferential direction; A locking member having a locking projection for locking with the locking projection, and locking the locking projection to the locking projection of the rotating plate to prevent rotation of the rotating plate; An electric actuator that switches and arranges the stop member to one of a locking position where the locking member is locked with the rotating plate and a non-locking position where the locking member is separated from the rotating plate and is unlocked. Having both a rotating plate and a locking member. When the rotating shaft rotates so that the brake pad is separated from the disk, the brake pad is locked to prevent the rotation plate from rotating in the same direction any more, and the brake pad is pressed against the disk. When the rotating shaft rotates, the parking pad is configured to release the lock between the rotary plate and the locking member, and the brake pad is driven by the disk based on a parking brake operation command. A first step of operating the drive motor so as to press against the rotating plate with a predetermined pressing force, and a second step of operating the electric actuator such that the locking member is at the locking position where the locking member is locked to the rotating plate. Performing a third step of stopping power supply to the drive motor and the electric actuator, and based on a parking brake release command, A fourth step of operating the drive motor so that the brake pad is pressed against the disc; and a fifth step of operating the electric actuator such that the locking member is at the unlocked position separated from the rotating plate. And a parking brake control means for performing steps. 5. The electric brake device for a vehicle according to claim 2, wherein the parking brake control unit supplies power to the electric actuator after stopping supply of power to the drive motor in the third step. An electric brake device for a vehicle, wherein the supply is stopped. 6. The electric brake device for a vehicle according to claim 3, wherein said parking brake control means locks said lock member when said lock member is disposed at a non-lock position in said fifth step. An electric brake device for a vehicle, wherein a sixth step of applying a predetermined voltage to the electric actuator is performed so that the member is maintained at the unlocked position.