JPH047021Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a parking brake device, and more specifically, to a parking brake device that winds up a parking cable or a rope connected to it by rotating a winding drum. This invention relates to a parking brake device that applies a parking brake.

BACKGROUND OF THE INVENTION A brake device is known in which a parking brake is applied by winding a parking cable or a rope connected thereto around a winding drum. For example, JP-A-59-134036
This is what is described in the publication. Such a brake device has a worm and a worm wheel that mesh with each other, a motor connected to the worm, and a take-up drum that is provided to rotate integrally with the worm wheel, and rotates the motor in the forward direction. The parking brake is applied by winding the wire connected to the parking cable around the drum.

Problems to be Solved by the Invention However, the conventional parking brake device described above rotates the drum in the opposite direction by reversing the motor, thereby loosening the parking cable and releasing the brake. As a result, it took some time for the brakes to be released, causing the problem that the vehicle could not be started quickly.

Means to Solve the Problems This invention was made to solve these problems, and its gist is as follows:
A worm and a worm wheel that are provided so as to be able to mesh with each other; a rotational drive device that is directly or indirectly connected to the worm and drives the worm to rotate around an axis; In a parking brake device having a drum that applies a parking brake by winding up a parking cable or a cable connected thereto, the worm is moved from the worm wheel to a position where the worm is disengaged from the worm wheel. The worm wheel is provided with an engagement release device that is separable and moves the worm in the direction of separation to release the worm from meshing with the worm wheel.

Functions and Effects In such a device, when the parking brake is applied, that is, the parking cable is tightened, and the engagement release means disengages the worm from the worm wheel, the drum is released from the brake reaction force, etc. Based on this, it will be promptly reversed. Therefore, the parking brake is quickly released, and the vehicle can be started almost simultaneously with the brake release operation.

Embodiment Next, an embodiment in which the present invention is applied to an autobrake device that automatically operates to keep the vehicle in a braking state when the vehicle is stopped will be described in detail with reference to the drawings.

In the figure, 10 is a first sliding body, to which a parking cable 12 is connected to one end and a first operating cable 14 to the other end. The first sliding body 10 is
While it is movable in the left and right directions in the figure on the sliding surface 16 formed on the second sliding body 20, it is biased rightward by the first return spring 18. Similarly, the second sliding body 20 is also movable in the left-right direction on a sliding surface 24 formed on the support body 22, and is biased rightward by a second return spring 26. . One end of a second operating cable 28 is connected to the second sliding body 20, and when the second operating cable 28 is pulled by the manual operating device 30, the second sliding body 20 moves to the left in the figure. It is becoming more and more popular.

The other end of the first operating cable 14 is connected to the drum 32
When the drum 32 is rotated clockwise, the cable 14 is wound around the drum 32 and the first sliding body 10 is moved to the left in the figure. A worm wheel 34 is integrally provided on the drum 32, and a worm 36 is made to mesh with the worm wheel 34. The worm 36 has one end connected to a rotating shaft 43 of a motor 40 via a universal joint 38 so as to be relatively rotatable, and the other end connected to an engagement release device 41 . The disengagement device 41 includes an electromagnetic coil 42 and a movable piece 44, and when the electromagnetic coil 42 is excited, the electromagnetic coil 42 attracts the movable piece 44 and rotates the worm 36 in the disengagement direction. control switch 46
is for operating the device 41 by energizing the electromagnetic coil 42 of the disengagement device 41, and is turned on when the accelerator pedal is depressed and the wheel rotation sensor detects the rotation of the wheel. In addition,
Reference numeral 49 denotes a control device which cuts off power to the engagement release device 41 when the brake is released.
1 to the inactive state.

On the other hand, the motor 40 is controlled by a control switch 50 and a control device 48. The switch 50 operates to ON when the brake pedal is depressed, and the control device 48 supplies a start signal to the motor 40 when the wheel rotation speed detected by the rotation sensor, that is, the vehicle speed becomes approximately zero. That is, by rotating the worm 36,
Drum 3 in the direction of winding up first operation cable 14
2 is rotated. Note that the control device 48
supplies a stop signal to the motor 40 based on a signal from a sensor that detects when the parking cable 12 is tightened and the brake is activated.

Next, the operation of this device will be explained. When the vehicle is running, the first sliding body 10 and the second sliding body 20
is at the right end in the figure, and the autobrake device is in a non-operating state. In this state, when the brake pedal is depressed to stop the vehicle, such as when stopping at a traffic light, the switch 50 is turned on and the control device 48 is turned on.
A starting signal is supplied to the motor 40 from. As a result, the motor 40 is rotated in the forward direction, and the worm 36
Then, the worm wheel 34 that meshes with the worm wheel 34 is rotated, and the first operation cable 14 is wound around the drum 32. In conjunction with this, the first sliding body 10 is moved to the left in the figure, and at the same time the parking cable 12 is tightened to the left to apply the brake.

When the brake is applied, a motor stop signal is issued from the control device 48, and the motor 40 is stopped. If the motor 40 stops, the worm 3
6 and a worm wheel 34 meshing therewith,
Further, the drum 32 and the first sliding body 10 are stopped at that position, and the brake is maintained in the applied state. A force acts on the drum 32 and the worm wheel 34 to rotate them in the opposite direction (counterclockwise in the figure) based on the tension of the parking cable 12, that is, the brake reaction force. The drum 32 is locked in the position when the motor is stopped.

Next, when the accelerator pedal is depressed to start the vehicle and the wheels are thereby slightly rotated, the switch 46 is turned on and supplies a brake release signal to the engagement release device 41. When this signal is supplied to the disengagement device 41, the electromagnetic coil 42 is excited, attracts the movable piece 44, and moves the tip of the worm 36 in a direction away from the worm wheel 34. That is, the worm 36 is rotated in a direction in which it disengages from the worm wheel 34. When the worm 36 and the worm wheel 34 are disengaged, the drum 32 is now in a state where it can freely rotate. Therefore, the first sliding body 10 is moved toward the drum 3 by the brake reaction force and the biasing force of the first return spring 18.
2 counterclockwise and forcefully returned to the right in the figure to loosen the parking cable 12.
In other words, the brake is released. When the brake is released, the released state is detected by a sensor (for example, a limit switch that detects the position of the parking cable 12, etc.), and the control device 49 controls the current supply to the engagement release device 41 based on this detection signal. cut off. Then, the movable piece 44 is again projected upward in the figure by the biasing force of a spring (not shown).
Return the worm 36 to the position where it engages with the worm wheel 34. As a result, the drum 32 and motor 40
If the brake pedal is reconnected and the brake pedal is then depressed to stop the vehicle,
The parking brake is automatically applied by the above-mentioned action.

By the way, the device of this example can be operated not only automatically as described above but also manually. Manual operation device 3
0 and pull the second operation cable 28. When the second operating cable 28 is pulled, the second sliding body 20 is moved to the left, and at this time, the first sliding body 10 is also moved together to tighten the parking cable 12. On the other hand, when the manual operating device 30 is released, the second sliding body 20 is moved to the right by the brake reaction force and the urging force of the second return spring 26, and at the same time, the parking cable 12 is loosened.

In this way, the device of this example is designed to release the brake by disengaging the worm 36 and the worm wheel 34. At this time, since the drum 32 can rotate quickly, the parking brake is released almost instantaneously. This makes it possible to start the vehicle quickly, and also improves the fuel efficiency of the vehicle.

Although one embodiment of the present invention has been described in detail above, the present invention can also be implemented in other embodiments.

For example, it is possible to use a device that uses air pressure or hydraulic pressure as a drive source as the disengagement device 41, and it is also possible to indirectly connect the worm 36 to the motor 40 via a member such as a gear. It is. Furthermore, in the case where the worm 36 and the motor 40 are directly connected, the worm 36 and the worm wheel 3 are connected while rotating the motor 40 itself.
It is also possible to release the mesh with 4.

In addition, the present invention can be implemented with various modifications based on the knowledge of those skilled in the art without departing from the spirit thereof.

[Brief explanation of the drawing]

The attached drawing is a diagram showing the configuration of a parking brake device that is an embodiment of the present invention. 12... Parking cable, 32... Drum, 34... Worm wheel, 36... Worm, 38... Universal joint, 40...
Motor (rotary drive device), 41...disengagement device.

Claims (1)

[Claims for Utility Model Registration] A worm and a worm wheel that are provided so as to be able to mesh with each other, a rotational drive device that is connected directly or indirectly to the worm and rotates the worm around an axis, and the worm wheel and the worm wheel. A parking brake device including a drum that is provided to rotate integrally and applies a parking brake by winding up a parking cable or a rope connected to the parking cable, wherein the worm is engaged with the worm wheel. A parking brake device comprising: a disengagement device which is separable from the worm wheel to a disengaged position, and which disengages the worm from the worm wheel by moving the worm in the direction of the disengagement.