JP3466216B2 - Parking brake operating device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parking brake operating device, and more particularly to a parking brake operating device having a power operating device.

[0002]

2. Description of the Related Art As a kind of parking brake operating device,
(A) It has a power source, and is configured to include a power operation device that operates the parking brake based on the power of the power source, and (b) a power operation device control device that controls the power operation device. There is something.

For example, the device of Japanese Utility Model Laid-Open No. 61-110058 has a stick-shaped parking brake operating lever, and a parking brake provided on each wheel is connected to the lower end of the operating lever via a brake cable. There is. When the operating lever is raised in the axial direction, the operating force is transmitted via the brake cable, and the parking brake is activated.

The operating lever is moved up and down by a power operating device using an electric motor as a power source. The power operating device is composed of a pinion fixed to the rotating shaft of the electric motor, a rack portion formed on the lower surface of the operating lever, a control device for controlling conduction / interruption between the electric motor and the power source, and the like. Stop the vehicle and set the ignition switch to OF
By performing a predetermined operation such as setting to F, the electric current is supplied to the electric motor. When the electric motor is driven, the pinion integrally rotates, the engagement between the pinion and the rack portion raises the operation lever, and the operation force is applied to the parking brake, so that the parking brake is activated. When the limit switch detects that the operating lever has reached the predetermined operating position, the supply of current to the electric motor is cut off, and the parking brake is kept in the operating state.

In the above device, the power operation device is operated by the operation command signal issued by the driver performing a predetermined switch operation, and the parking brake is operated.

In the device disclosed in Japanese Utility Model Laid-Open No. 63-159370, after the parking brake operating lever is pulled up by the driver, the operating lever is raised by the power operating device using the air cylinder as the power source. It is like this. The power operating device has a pawl that is engaged with ratchet teeth formed on an operating lever at one end so as to be rotatable, and is rotatable about one axis, and the other end of the rotating member and the air cylinder. And a cable that connects the piston to the piston, and the operation lever is raised by rotating the rotating member via the cable by the operation of the air cylinder.

If the driver pulls the operating lever above a predetermined operating position, the power operating device does not operate, but if the operating lever does not reach the operating position, the power operating device operates. As a result, the operating lever is raised, and the operating force of the parking brake is increased. When the operating lever reaches a predetermined operating position, the limit switch stops the operation of the air cylinder. In this device, even if the operating force of the parking brake becomes insufficient due to insufficient pulling up of the operating lever, the power operating device raises the operating lever to increase the operating force of the parking brake.

[0008]

[Problems to be Solved by the Invention] However, the above 2
In the two devices, since the operating force of the power operating device was regulated by the operating position of the operating lever, there was a problem that the operating force of the parking brake varied, and a sufficient operating force could not be obtained. For example, if the brake cable disposed between the operating lever and the parking brake stretches and becomes longer during use, even if the operating lever is operated to the set position by the power operation device, The parking brake operating force is reduced by the amount of extension, and the parking brake cannot be operated sufficiently.

In view of this problem, an object of the present invention is to always obtain a parking brake operating device provided with a power operating device capable of operating the parking brake with a preset constant operating force. .

[0010]

A parking brake operating device according to one aspect of the present invention is (a) a parking brake operating member operated by a driver to operate the parking brake via a brake cable, (b) a power operating device that has a power source and that operates the parking brake via the brake cable based on the power of the power source; (c) an operating force sensor that detects an operating force; and (d) A movable member provided so as to be capable of relative movement with respect to the brake operating member, and (e) a brake operation including a ratchet tooth provided on one of the brake operating member and the movable member and a ratchet pawl provided on the other. A ratchet mechanism that allows relative movement in one direction between the member and the movable member but blocks relative movement in the opposite direction; and An actuating force transmitting device that transmits to the member in the opposite direction, (g) a reaction force transmitting device that transmits the reaction force of the operating force applied to the movable member from the brake cable to the operating force sensor, (h) Power operation device control for activating the power operation device when the operation force detected by the operation force sensor is less than a preset set operation force, and stopping the power operation device when the set operation force is reached And a device. When the parking brake operating member is a stick-shaped lever that is operated in the axial direction, it is desirable that the movable member is a slider that is relatively movable in the axial direction of the stick-shaped lever, and the slider has A pulley is attached rotatably around an axis of rotation perpendicular to the axial direction of the stick-shaped lever, one end of a cable other than the brake cable wound around the pulley is connected to the power operating device, and the other end is It is desirable that the pulley and another cable be connected to the operation force sensor so as to form the actuation force transmission device and the reaction force transmission device. On the other hand, in the case where the parking brake operating member is a pivotable lever that is pivotally operated about one axis, the movable member is rotatable relative to the pivotable lever about the one axis. It is desirable that the brake cable is a moving member, and two end portions of the brake cable and another cable are respectively attached to two cable guides provided in the rotating member in an arc shape centered on the one axis. While being wound around, one end of each of the two cables is fixed to the rotating member, and the other cable is connected to both the power operating device and the operating force sensor, so that the other cable is connected to the working member. It is desirable to configure the power transmission device and the reaction force transmission device.

[0011]

In the parking brake operating device configured as described above, the parking brake operating member is the driver.
Operated by the brake cable
The king brake is activated. Break in that state
The operating force applied to the operating member is eliminated
And from the parking brake via the brake cable
The reaction force applied to the brake operating member is the ratchet mechanism.
Is transmitted to the movable member via the
Is transmitted to the operating force sensor. Transmission to this operating force sensor
Reaction force, that is, the hand of the parking brake operating member
Dynamic operation force and parking brake operation force (action force)
Is smaller than the preset size, power operation
The device controller actuates the power operating device. as a result,
Actuating force transmission device, movable member, ratchet mechanism, brake
Parking brake via operating member and brake cable
The operating force of the rake is increased and the reaction force transmission device controls the rake.
The reaction force transmitted to the force sensor increases. And reaction force
When the power reaches a preset size, the power operation device control
The device deactivates the power operated device. Therefore , when the parking brake is activated by manual operation of the parking brake operating member, even if the brake cable is extended, the brake cable is tightened until the parking brake operating force reaches the set value. That is, when the detected operation force by the operation force sensor is less than the set operating force is power-operated device is actuated by a power-operated device controller, elongation amount of the brake cable
Only the brake operating member is moved beyond its normal operating position.
Then, the parking brake is operated ( set into an operating state) with the set operation force. It is also possible to apply a proper operation force of a preset magnitude to the parking brake by directly tightening the brake cable by the power operation device.

[0012]

Therefore, when the operating force of the parking brake operating member becomes insufficient due to the fact that the brake cable arranged between the parking brake operating member and the parking brake extends and becomes longer during use. also, since the parking brake is operated by setting the operation force, the parking brake is allowed to operate reliably, you increase safety during the vehicle parked or stopped is.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. In FIG. 1, 10 is a parking brake operation lever (hereinafter, simply referred to as an operation lever).
The operating lever 10 has a stick shape, and is held in a cylindrical holding member 12 so as to be movable in the axial direction and rotatable by 90 degrees around the axis. The holding member 12 is fixed to the vehicle body 18 by brackets 14 and 16.

A grip 22 is provided at the end of the operating lever 10 protruding from the holding member 12, and one end of a brake cable 24 is connected to the opposite end. The brake cable 24 extends while being guided by the outer tube 25, and is connected to a free end portion of an intermediate lever 28 rotatably attached to the vehicle body 18 by a bracket 26. Parking brakes 40, 42 provided on wheels 36, 38 are connected to an intermediate portion of the intermediate lever 28 via a rod 30, an equalizer 32, and a brake cable 34. The brake cable 24 is tightened by axially moving the operation lever 10 to the grip 22, and the force is boosted by the intermediate lever 28, equally divided by the equalizer 32, and passed through the brake cable 34. Transmitted to the parking brakes 40, 42,
The parking brakes 40 and 42 are activated.

A large number of ratchet teeth 50 are formed in the axial direction on a part of the outer peripheral surface of the operating lever 10. The ratchet teeth 5 extend from the opening 52 extending in the longitudinal direction of the holding member 12.
Part of 0 is exposed. The opening 52 is the guide portion 5.
It is connected to 4.

On the other hand, a pin 56 is projected from the outer peripheral surface of the operating lever 10 in the direction at a right angle. The pin 56 is located in the groove 62 of the guide portion 54 in the state where the operation lever 10 is in the original position in FIG. 1, and allows the operation lever 10 to move in the axial direction and prevents the rotation, while the operation lever 1
0 is located in the wide portion of the guide portion 54 in the operating position shown in FIGS.
Allow rotation of degrees. When the operating lever 10 is rotated 90 degrees around the axis in the operating position and then lowered inside the holding member 12, the pin 56 moves the pin 56 to the slope 6 of the guide portion 54.
4, the operating lever 10 is rotated 90 degrees in the clockwise direction, the pin 56 is fitted in the groove 62, and the operating lever 10 is returned to the original position.

When the operating lever 10 is in the original position shown in FIG. 1, the pin 56 abuts on the contact of the brake switch 58 fixed to the holding member 12, and the brake switch 5
Although the switch 8 is in the OFF state, if the operating lever 10 is slightly pulled out, the pin 56 is separated from the contactor, and the brake switch 58 is turned on. The brake switch 58 is connected to the control circuit 60, and the output signal of the brake switch 58 is input to the control circuit 60.

A slider 66 is attached to the holding member 12 so as to be slidable in the axial direction. The slider 66 includes a ratchet pawl 68 that can be meshed with the ratchet teeth 50. The ratchet pawl 68 is biased by an elastic member (not shown) in a direction to engage with the ratchet teeth 50, and the ratchet pawl 68 engages with the ratchet teeth 50 to hold the operation lever 10 at an arbitrary position. When the operation lever 10 is pulled up to the operation position against the biasing force of the return springs of the parking brakes 40 and 42, the reaction force applied to the operation lever 10 from the parking brakes 40 and 42 is transmitted from the ratchet teeth 50 to the ratchet pawl 68. And is transmitted to the slider 66. Slider 6
6 is always held at the original position shown in FIGS. 1 and 2 by the biasing force of the return spring 72 arranged between the retainer 70 fixed to the holding member 12 and the retainer 70. In this state, the contact piece 74 fixed to the slider 66 acts on the origin switch 76 fixed to the holding member 12, and the origin switch 76 is in the ON state. The origin switch 76 is connected to the control circuit 60, and the output signal of the origin switch 76 is input to the control circuit 60.

The vehicle body 18 is also provided with an electric motor (hereinafter, simply referred to as a motor) 80 capable of rotating in both forward and reverse directions. A pulley 84 is attached to the output shaft of the motor 80 via a speed reducer 82 so as to be relatively non-rotatable.
The speed reducer 82 decelerates the rotation of the output shaft and transmits it to the pulley 84, and also prevents the motor 80 from being rotated by the rotational force applied to the pulley 84. Of which, it is composed of gear differentials and the like. The motor 80 is connected to the control circuit 60. The control circuit 60 drives or stops the motor 80 in the forward or reverse direction based on the signals respectively input from the brake switch 58, the origin switch 76 and the pressure sensor 96 described below.

The bracket 14 and slider 66 include
Pulleys 86 and 88 are rotatably attached, and a cable 90 is wound between these pulleys 86 and 88. One end of the cable 90 has a bracket 1
It is fixed to an arm 92 rotatably attached to the armature 4. A contact piece 94 is formed integrally with the arm 92, and is brought into contact with a contact of a pressure sensor 96 fixed to the holding member 12. The pressure sensor 96 is the control circuit 6
It is connected to 0, and a signal corresponding to the detected pressure is input to the control circuit 60. The other end of the cable 90 is connected by a connecting member 98 to one end of a cable 100 wound around the pulley 84.
When the motor 80 is stopped, the cables 90, 100
A constant tension is applied to the pressure sensor 96, and this tension is detected by the pressure sensor 96 via the pulley 88, the cable 90 and the arm 92.

In the parking brake operating device constructed as described above, when the parking brakes 40 and 42 are not in operation, the operation lever 10 is in the original position, and the OFF signal is issued from the brake switch 58.
The slider 66 is held in the original position by the urging force of the return spring 72, and the origin switch 76 also outputs an OFF signal. Therefore, the urging force of the spring 72 applied to the slider 66 is detected by the pressure sensor 96, and the detection signal corresponding thereto is input to the control circuit 60. Based on these input signals, the control circuit 60 keeps the motor 80 stopped.

On the other hand, when the driver grips the grip 22 and pulls up the operation lever 10, the brake cable 24 is tightened and the intermediate lever 28 is pulled up.
The parking brakes 40 and 42 are brought into an operating state via the above. The operation lever 10 that has been pulled up is held in the operation position by the engagement of the ratchet teeth 50 and the ratchet pawl 68, and the parking brake reaction force applied to the slider 66 is transmitted from the pulley 88 to the cable 90.
/ 2 force is applied to the pulley 86, and the remaining 1/2 force is applied to the arm 9
2 is transmitted by the pressure sensor 96. Further, since the pin 56 is separated from the contact of the brake switch 58 as the operation lever 10 is pulled up, an ON signal is emitted from the brake switch 58 and input to the control circuit 60.

If the parking brake reaction force detected by the pressure sensor 96 is equal to or greater than the set value, the parking brake operating force is also equal to or greater than the set value, the control circuit 60 keeps the motor 80 in the stopped state, and as shown in FIG. The slider 66 is also held in the original position.

On the other hand, the driver's operating lever 1
When the pulling of 0 is insufficient and the parking brake reaction force detected by the pressure sensor 96 is less than the set value, the control circuit 60 drives the motor 80 in the forward direction based on the input signal from the pressure sensor 96. Then, the pulley 84 rotates and the winding of the cable 100 is started. Along with this, the cable 90 is pulled, and the slider 66 is raised along with the pulley 88 along the axial direction of the holding member 12, as shown in FIG. Ratchet pawl 68 of slider 66
Meshes with the ratchet teeth 50 of the operating lever 10, so that the operating lever 10 is raised as the slider 66 moves. Therefore, the brake cable 24 is tightened, and the parking brake operating force increases. Since the contact piece 74 is separated from the contact of the origin switch 76 as the slider 66 moves, the origin switch 7
An ON signal is emitted from 6 and is input to the control circuit 60.

When the parking brake reaction force detected by the pressure sensor 96 reaches a set value as the operating lever 10 moves up, the control circuit 60 stops the motor 80 by the output signal thereof. Therefore, the pulley 88, the slider 66, and the operating lever 10 are stopped from rising, and the parking brakes 40, 42 are held in the operating state by the predetermined parking brake operating force.

When the vehicle is started, the driver holds the grip 22 of the operating lever 10 and pulls up the operating lever 10 slightly, and the operating lever 10 is moved around its axis 9
When the ratchet teeth 50 and the ratchet pawl 68 are disengaged by rotating the ratchet teeth 50 by 0 degree, the operation lever 10 is pulled back into the holding member 12 by the parking brake reaction force, and the parking brakes 40 and 42 are released. When the operation lever 10 is returned to the original position, the pin 56 contacts the contact of the brake switch 58, and the brake switch 5
An OFF signal is issued from 8.

As shown in FIG. 3, when the slider 66 is raised during the operation of the parking brake, even if the OFF signal is issued from the brake switch 58, the ON signal is issued from the origin switch 76. The control circuit 60 rotationally drives the motor 80 in the reverse direction because the motor 80 remains in the above state. As a result, the pulley 10 is connected to the cable 10
0 is extended, the tension of the cable 90 is relaxed, and the pulley 88 and the slider 66 are allowed to move, so that the slider 6 is biased by the return spring 72.
6 is lowered along the holding member 12 and returned to the original position. When the contact piece 74 contacts the contact of the origin switch 76, an OFF signal is issued from the origin switch 76, and the control circuit 60 stops the motor 80 accordingly. In this state, the slider 66 can be further lowered, but the slider 66 is stopped when the motor 80 is stopped.
Also stops in place.

In this embodiment, the operating lever 10 corresponds to a stick-shaped lever which is a kind of parking brake operating member, and the slider 66 corresponds to a movable member. Further, the ratchet teeth 50 and the ratchet pawl 68 form a ratchet mechanism, and the electric motor 80, which is a power source, forms a power operating device together with the pulley 84. Pressure sensor 9
6 constitutes an operating force sensor, and the control circuit 60 constitutes a power operating device control device.

In this embodiment, the control circuit 60,
Even when the motor 80 or the like fails to operate, it can be used as a normal parking brake operating device without any trouble. When an abnormality occurs in the control circuit 60 or the like and the motor 80 operates abnormally, the connecting member 98
If the connection between the cable 90 and the cable 100 is cut off, it can be used as a normal parking brake operating device.

In this embodiment, after the operating lever 10 is pulled up by the driver, when the parking brake operating force is less than the preset operating force, the power operating device operates to operate the parking brake. It is designed to increase the force, but the driver's operating lever 1
When the pulling force of 0 is too large and the parking brake operating force exceeds the set operating force, it is possible to reduce the operating force by operating the power operating device. For example, the origin switch 76 is a switch means (a limit switch or a photoelectric switch is acceptable) of a type that allows the contact piece 74 to pass, and the control circuit has means for storing which side of the origin position the slider 66 is. As a matter of fact, after the driver finishes pulling up the operation lever 10, the slider 66 can be moved in either forward or reverse directions. By doing this, the brake cable 2
It is possible to reduce elongation and deterioration of 4, 34, etc., and improve the life.

Further, in this embodiment, after the driver pulls up the operation lever 10, the control circuit 60 issues an operation command to operate the power operation device. It is configured to include switches such as a brake operation switch and an ignition switch, and a control circuit, and an operation command signal is issued by the driver operating these switches, and the operation lever is pulled up by the power operation device, and parking is performed. It is also possible for the brakes to be activated.

Further, instead of the control circuit 60, a control device provided with a microcomputer is provided as operation command means, and for example, an operation command signal is automatically issued to the power operation device several seconds after the vehicle stops. In this case, the parking brake can be operated without any manual operation by the driver.

In this embodiment, the parking brake is operated by pulling up the stick-shaped operation lever 10. However, the parking brake is operated by a manually rotating operation lever or a foot-operated operation lever. The present invention can be applied to a parking brake operating device of an actuated type.

The power operating device may be of a type in which the parking brake is operated by directly tightening the parking brake cable without moving the operating lever.

Yet another embodiment of the present invention is shown in FIGS.
Shown in. The parking brake operating device of the present embodiment is provided in a vehicle with an automatic transmission, and the power operating device applies the parking brake in response to the operation of the shift lever.

In FIGS. 4 and 5, reference numeral 180 denotes a vehicle body, and a pair of brackets 182, 184 are fixed to the vehicle body 180 at intervals as shown in FIG. A manual operation lever 188 is rotatably attached to a shaft 186 supported by the brackets 182 and 184 via a bush 190 and a pair of plates 192. The manual operation lever 188 has a U-shaped cross section, and one end of a brake cable 194 is connected to an outer surface of the manual operation lever 188 by a cable retainer 196. The brake cable 194 is connected to the outer tube 198 as shown in FIG.
When the manual operation lever 188 is rotated to tighten the brake cable 194, the force is equally divided by the equalizer 200 and the brake cable 202 is guided by the equalizer 200.
Is transmitted to the parking brakes 204 and 206 via
The parking brakes 204 and 206 are activated. At that time, if the operating force of the manual operation lever 188 is insufficient, the insufficient operating force is compensated in the same manner as in the above-described embodiment.

As shown in FIG. 5, the grip 21 is attached to the end of the manual operation lever 188 extended from the shaft 186.
0 is attached. In addition, the manual operation lever 188
A brake release button 212 is axially slidably fitted inside, and one end of a release rod 214 is connected to the other end of the release rod 214.
16 is rotatably connected by a pin 218. The ratchet pawl 216 is rotatably attached to the manual operation lever 188 by a shaft 220, and is provided with a release rod 214.
Is urged by a spring 224 disposed between the ratchet claw 2 and the manual operation lever 188.
16 is a ratchet tooth 228 of the ratchet wheel 226
Have been meshed with. 230 is a ratchet claw 222
Of the ratchet teeth 228 is a stopper that restricts rotation in a direction out of engagement with the ratchet teeth 228.

As shown in FIG. 6, the ratchet wheel 226 is rotatably attached to the shaft 186 via a pair of bushes 231 and a spacer 232.
As shown in FIG. 5, one end of a pulling cable 234 is connected to the ratchet wheel 226 by a cable retainer 236 and is guided by a partially annular cable guide 237. The tension cable 234 is wound around the pulley 238 and inverted, and the other end is connected to the tension sensor 240. The pulley 238 is rotatably attached to the pulley support 242, and one end of a drive cable 244 is connected to the pulley support 242.

The other end of the drive cable 244 is connected to a pulley 248 rotated by an electric motor 246. The pulley 248 is attached to the electric motor 246 via the speed reducer 250. Similar to the speed reducer 82, the speed reducer 250 is composed of a tooth-tooth swinging device, a tooth-tooth differential device, and the like, and decelerates the rotation of the output shaft of the electric motor 246 to transmit the rotation to the pulley 248 and the pulley 2
The rotation force applied to 48 prevents the electric motor 246 from rotating.

A torsion spring 252 is provided between the ratchet wheel 226 and the bracket 182 to urge the ratchet wheel 226 counterclockwise in FIG. A detection piece 254 is attached to the ratchet wheel 226, and the bracket 182 is attached.
The ratchet wheel sensor 256 attached to the mounting member 255 detects the detection piece 254, thereby detecting the position of the ratchet wheel 226 in the inactive state of the parking brakes 204 and 206, that is, the original position. The ratchet wheel sensor 256 issues an OFF signal when detecting the original position.

The electric motor 246 is controlled by the parking brake controller 260. The parking brake controller 260 includes the tension sensor 2
40, ratchet wheel sensor 256, and manual operation lever operation detection switch 264, seat sensor 266, brake pedal depression detection switch 268, and parking range detection switch 270.

The manual operation lever rotation detection switch 264 is attached to the bracket 184, and as shown in FIG. 5, the plate 272 attached to the outer surface of the manual operation lever 188 is brought into contact with or separated from the detector. It is for detecting whether the manual operation lever 188 is rotated, that is, whether the parking brakes 204 and 206 are in the operating state, and an OFF signal is output when the manual operation lever 188 is not rotated. Turns on when turning
It is said to emit a signal. Also, the sheet sensor 2
66 is a sensor that detects whether or not the driver is sitting in the driver's seat, and is ON when the driver is sitting in the driver's seat.
It is said to emit a signal and an OFF signal when not sitting. Brake pedal depression detection switch 2
Reference numeral 68 denotes a switch for detecting the depression of the brake pedal 274 for applying the service brake, which emits an OFF signal when the pedal is not depressed and an ON signal when the pedal is depressed.

The parking range detection switch 270 is
The shift lever device 278 shown in FIG. 4 is provided.
The shift lever device 278 is a device that controls the shift of the automatic transmission by operating the shift lever 280. The parking range detection switch 270 indicates that the shift lever 280 is in the parking range and that the parking range is selected. To detect. Shift lever device 2
78 is provided with a shift lock mechanism, and when the parking range is selected, the other range cannot be selected unless the service brake is applied, and the driver missteps the accelerator pedal and the brake pedal 274. But it doesn't matter. Because of such a shift lock mechanism, a vehicle provided with the parking brake operating device is provided with a brake pedal depression detection switch 268 and a parking range detection switch 270, and signals from these switches 268 and 270 are parked. It is supplied to the brake controller 260. This parking range detection switch 270
Emits an ON signal when a parking range is selected and turns off when a range other than the parking range is selected.
It is said to emit a signal.

In the parking brake operating device of this embodiment, the brake pedal is operated when the vehicle is stopped and the manual operation lever rotation detecting switch 264 detects that the manual operation lever 188 is not rotated. When the depression of 274 is released and the selection of the parking range is detected, the electric motor 246
Is driven. As a result, when the drive cable 244 is wound by the pulley 248, the pulley 238 is moved to the left in FIG.
4 is pulled, and the ratchet wheel 226 is rotated clockwise in FIG. Along with that, the manual operation lever 188 engaged with the ratchet wheel 226 is rotated clockwise by the engagement of the ratchet pawl 216 and the ratchet tooth 228, the brake cable 194 is tightened, and the parking brake 204,
206 is activated.

When the pull cable 234 is pulled,
The tension applied to the brake cable 194 is detected by the tension sensor 240, and when the tension reaches the set value, the supply of the electric current to the electric motor 246 is cut off and the parking brakes 204 and 206 are kept in the operating state. Thus, until the tension reaches the set value, the brake cable 19
4 is tightened so that the parking brake 2
The friction materials of 04 and 206 are worn and the brake clearance is increased, or the brake cable 194
A constant braking force can always be obtained even if there is elongation.

In the parking brakes 204 and 206 thus operated, it is detected by the seat sensor 266 that the driver is sitting in the driver's seat and that the service brake is operated by the brake pedal depression detection switch 268. When it is detected and the parking range detection switch 270 detects that the shift lever device 278 selects a range other than the parking range, the electric motor 246 is rotated in the direction opposite to that when the parking brake is applied. Therefore, the ratchet wheel 226 is biased by the torsion spring 252 to be rotated counterclockwise in FIG. 5, the manual operation lever 188 is rotated in the same direction, the brake cable 194 is loosened, and the parking brake 20 is released.
4,206 is released. Then, the ratchet wheel 226 returns to the original position, and the ratchet wheel sensor 25
When the OFF signal is issued from 6, the electric motor 246 is stopped.

In this embodiment, when the ratchet wheel 226 cannot be rotated due to a failure of the parking brake controller 260 or the electric motor 246, the driver manually activates or releases the parking brake. You can If the driver squeezes the grip 210 of the manual operation lever 188 to rotate the manual operation lever 188 around the shaft 186, the ratchet pawl 216 rides over the ratchet teeth 228 and the rotation of the manual operation lever 188 is allowed. Thus, the brake cable 194 is tightened and the parking brakes 204 and 206 are operated.

Further, the parking brakes 204 and 206
When releasing, the brake release button 212 is pushed with the manual operation lever 188 slightly raised. As a result, the ratchet pawl 216 is rotated and disengaged from the ratchet teeth 228, and the driver operates the manual operation lever 1
By rotating 88, the brake cable 194 can be loosened, and the parking brakes 204 and 206 can be released.

As described above, the parking brake operating device according to the present embodiment can operate the parking brakes 204 and 206 without operating the manual operating lever 188 as long as the electric system and the control system are not damaged. The burden on the driver can be reduced, and it is particularly effective when the parking brake operating device is provided in a vehicle for a physically handicapped person.

As is apparent from the above description, in this embodiment, the manual operation lever 188 constitutes a rotary lever which is a kind of brake operation member, and the ratchet wheel 226 is a rotary member which is a kind of movable member. Are configured. Further, the electric motor 246 constitutes a power source and a power operating device, and the ratchet pawl 216 and the ratchet tooth 2 are provided.
28 constitutes a ratchet mechanism, the tension sensor 240 constitutes an operation force sensor, and the parking brake controller 260 constitutes a power operation device control device.

The embodiments of the embodiments shown in FIGS. 4 to 6 are not limited to those having a rotary type manual operation lever, but can be applied to a walking stick type or foot stepping type parking brake operating device.

Although the two embodiments of the present invention have been described above, other various modifications, based on the knowledge of those skilled in the art, are also possible.
The present invention can be implemented in an improved manner.

[Brief description of drawings]

FIG. 1 is a front view showing a parking brake operating device according to an embodiment of the present invention.

FIG. 2 is an enlarged front view of a main part of the parking brake operating device, showing an operating state different from that in FIG.

FIG. 3 is an enlarged front view of the main part of the parking brake operating device, showing an operating state different from those in FIGS. 1 and 2.

FIG. 4 is a front view showing an appearance of a parking brake operating device according to another embodiment of the present invention.

5 is a front cross-sectional view showing a main part of the parking brake operating device shown in FIG.

6 is a sectional view taken along line VI-VI in FIG.

[Explanation of symbols]

10 Parking brake operating lever 12 Holding member 24 brake cable 40, 42 Parking brake 50 ratchet teeth 58 Brake switch 60 control circuit 66 slider 68 Ratchet Claw 72 Return spring 76 Origin switch 80 electric motor 84,86,88 pulleys 90 cable 96 pressure sensor 100 cables 188 Manual operation lever 194 Brake cable 204,206 Parking brake 216 Ratchet Claw 228 ratchet teeth 234 Tensile cable 240 Tension sensor 244 drive cable 246 electric motor 256 ratchet wheel sensor 260 parking brake controller 266 sheet sensor 268 Brake pedal depression detection switch 270 Parking range detection switch

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Junichi Miyagi               Toyota City, Toyota-cho, Toyota City, Aichi Prefecture               Motor Co., Ltd. (72) Inventor Isao Shimazu               Aichi Prefecture Anjo City Imahoncho 4-14-24 million               Noh Industry Co., Ltd.                (56) References JP-A-59-145658 (JP, A)                 JP-A-2-270667 (JP, A)                 JP-A-59-11935 (JP, A)                 3-82257 (JP, U)                 Actual Kaihei 2-13859 (JP, U)                 63-159370 (JP, U)                 Actual Kaihei 1-142363 (JP, U)

Claims (3)

(57) [Claims] 1. A parking brake operating device for operating a parking brake, comprising: a parking brake operating member operated by a driver to operate the parking brake via a brake cable; and a power source. A power operation device that operates the parking brake via the brake cable based on the power of the operation force, an operation force sensor that detects an operation force, a movable member that is provided so as to be relatively movable with respect to the brake operation member, With the ratchet teeth provided on one of the brake operating member and the movable member and the ratchet pawl provided on the other, the one direction relative movement between the brake operating member and the movable member is permitted, but the opposite relative movement is not allowed. A ratchet mechanism for preventing the operation force of the power operating device from being applied to the movable member in the reverse direction. An operating force transmitting device for transmitting, a reaction force transmitting device for transmitting a reaction force of the operating force applied to the movable member from the brake cable to the operating force sensor, and an operating force detected by the operating force sensor in advance. A parking brake operation, comprising: a power operation device control device that activates the power operation device when the set operation force is less than a predetermined set operation force, and stops the power operation device when the set operation force is reached. apparatus. 2. The parking brake operating member is a stick-shaped lever that is operated in the axial direction, the movable member is a slider that is relatively movable in the axial direction of the stick-shaped lever, and the slider is the stick-shaped member. A pulley is attached rotatably around a rotation axis perpendicular to the axial direction of the lever, and one end of the cable, which is different from the brake cable wound around the pulley, is connected to the power operating device.
The parking brake operating device according to claim 1 , wherein the other end is connected to the operating force sensor, and the pulley and another cable constitute the operating force transmitting device and the reaction force transmitting device. 3. The parking brake operating member is a rotary lever that is pivotally operated around an axis, and the movable member is rotatable relative to the pivotable lever around the axis. It is a rotating member, and each one end of the brake cable and another cable is wound around two cable guides provided in the rotating member in an arc shape with the one axis as a center, One end of each of the two cables is fixed to the rotating member, and the other cable is connected to both the power operating device and the operating force sensor, so that the other cable is connected to the operating force transmitting device and the operating force sensor. The parking brake operating device according to claim 1 , which constitutes a reaction force transmitting device.