JPH0341968Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a parking brake device that brakes wheels by operating a cable using a parking brake lever.

In a conventional parking brake device, for example, a parking brake lever is pivotally attached to a ratchet plate fixed to the vehicle body, and
When the parking brake lever is pulled up,
The sector carved into the ratchet plate engages with the locking pawl pivotally attached to the parking brake lever, pulling the cable connected to the parking brake lever to hold both the left and right wheels in a braking state, and To release the braking state, there is a system in which a release button provided on the head of the parking brake lever is pressed to release the engagement between the sector and the locking pawl, and the parking brake lever is pushed back.

However, in such conventional parking brake devices, a ratchet plate and a locking pawl are provided to maintain the parking brake lever in the braking state where the cable is pulled, and the engagement between the sector and the locking pawl is released. The structure is complicated because a release button must also be provided to release the parking brake lever, and when pushing the parking brake lever back, the release button must be pressed while the parking brake lever is pushed back. However, there was another problem in that the parking brake lever was only operated in stages.

The present invention was developed by focusing on these conventional problems, and eliminates the need for a ratchet plate and locking pawl, as well as the need for a release button to release the engagement between the two. The aim is to solve the above problems by doing so.

The gist of the present invention to achieve this purpose is to provide a parking brake device that brakes wheels by operating a cable using a parking brake lever, which includes: a drum fixed to a base fixed to the vehicle body;
A lock spiral made of a hard elastic material is wound around the drum, and the parking brake lever is provided with an operating lever pivotably mounted on the drum, and a pivot of the operating lever. The operating lever is pivoted on the same axis, and in the direction of raising the operating lever, a part of the operating lever contacts and can be interlocked, while in the direction of lowering the operating lever, it escapes and can be relatively displaced. and an auxiliary lever disposed adjacent to the wheel and connected to a cable extending to the wheel, and the lock spiral body has one end fixed to the auxiliary lever and is operated by pulling up the operating lever during braking operation. When the auxiliary lever is engaged, the one end is displaced in the loosening direction, and when the auxiliary lever receives a braking reaction force from the cable, it is wound around the drum in the tightening direction, and the other end is displaced in the direction of loosening the operating lever. The auxiliary lever is provided with a spring that urges the other end of the locking spiral in the tightening direction, and when the operating lever is pushed back and tilted when the brake is released.
The parking brake device is characterized in that the part of the operating lever that is displaced relative to the auxiliary lever pushes the other end and displaces the lock spiral in the loosening direction.

Then, when the operating lever is pulled up and operated during braking, the auxiliary lever is interlocked after reaching the end of a predetermined amount of stroke that allows for relative displacement, and one end of the locking spiral is displaced in the direction of loosening, thereby increasing the winding force on the drum. The parking brake lever and locking helix rotate together, pulling the cable and braking the wheels.

When the operating lever is released under braking, the auxiliary lever is pulled back slightly by the braking reaction force applied to the cable, and one end of the locking spiral is slightly displaced in the tightening direction, and the other end is moved in the tightening direction by the spring. Since it is energized, the locking spiral wraps tightly around the drum. As a result, the lock spiral becomes unable to rotate, and the auxiliary lever is held while receiving the braking reaction force.

To release the brake, press down on the operating lever of the parking brake lever, and the operating lever will be displaced within a predetermined amount relative to the auxiliary lever.
The other end of the lock spiral is pushed by a part of the lock spiral, and the other end of the lock spiral is displaced against the biasing force of the spring that biases the other end in the tightening direction.

When the other end is pressed, the tightening force of the lock spiral on the drum becomes weaker, and with the braking reaction force of the cable, the parking brake lever and the lock spiral become rotatable together, and the auxiliary lever rotates in the direction of letting out the cable. The brake is released.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

Figures 1 to 4 show an embodiment of the present invention, in which a drum 2 is fixed to a base 1 fixed to the vehicle body with bolts B, and a pivot 21 is protruded from the drum 2. , and the head of the pivot 21 has a threaded portion 22.
is formed.

As shown in FIGS. 1 to 3, the parking brake lever 3 that pulls the cable C to the left in FIG.
It consists of an operating lever 4 pivoted on a pivot 21 and an auxiliary lever 5 pivoted on the pivot 21, and the operating lever 4 and the auxiliary lever 5 are attached to the pivot 21.
A nut N is tightened to the threaded portion 22 so as to be able to swing around the nut N.

An interlocking pin 41 is provided on the wall portion 40 of the operating lever 4.
is provided protrudingly, and the auxiliary lever 5 has an interlocking pin 4.
1 is formed, and when the operation lever 4 is pulled up and operated as shown in FIG. 5 rotates clockwise in conjunction with the operating lever 4, but escapes in the direction in which the operating lever 4 is pushed down and is configured to be relatively displaceable.

A coil spring 6, which is a locking spiral made of a hard elastic material, is wound around the drum 2.
One end 61 of the coil spring 6 is fixed by a locking portion 51 protruding from the auxiliary lever 5, and when the operating lever 4 is pulled up and operated as shown in FIG. A coil spring 6 is wound around the drum 2 so as to be displaced (displaced clockwise in FIG. 1). Furthermore, the other end 62 of the coil spring 6 is provided on the auxiliary lever 5 so that the other end 62 can abut against the abutting wall 42 of the operating lever 4 from below, and one end S1 is attached to the abutting wall 42 of the operating lever 4.
is biased by a spring S that contacts from below, and pushes back (pushes down) the operating lever 4.
At this time, the abutting wall portion 42 is arranged so as to displace the other end 62 (displace downward) in the direction in which the coil spring 6 loosens. As mentioned above, press the operating lever 4.
When pushing back and tilting down, the auxiliary lever 5 is initially stopped and the operating lever 4 is relatively displaced.

As shown in FIG. 1, the lower end 5 of the auxiliary lever 5
Cable C is connected to 2, and when the operating lever 5 is pulled up to brake both the left and right wheels and the cable C is pulled to the left in Fig. 1,
The reaction force of the cable C acts in the direction in which the coil spring 6 tightens the drum 2, that is, in the direction in which the one end 61 of the coil spring 6 is displaced counterclockwise (the first
It is configured to act in the right direction (in the figure).

Next, the effect will be explained.

In order to brake both the left and right wheels, move the operating lever 4 to the first position.
When the lever is pulled up in the figure, the interlocking pin 41 pushes the engaging portion 50 of the auxiliary lever 5 upward, so the auxiliary lever 5 rotates clockwise in conjunction with the operating lever 4. When the auxiliary lever 5 rotates clockwise, one end 61 of the coil spring 6 is displaced in a direction that loosens the tightening force of the coil spring 6 wound around the drum 2. Therefore, by pulling up and operating the control lever 4, the drum 2 can be rotated. The operating lever 4 and the auxiliary lever 5 rotate clockwise about the pivot 21, pulling the cable C to the left, and braking both the left and right wheels.

In this braking state, the cable C is moved in the direction in which the coil spring 6 firmly tightens the drum 2 (that is, in the direction in which the auxiliary lever 5 is rotated counterclockwise).
is acting, and the tightening force of the coil spring 6 is greater than the reaction force of the cable C, so the operating lever 4 is pulled up to the operating position (braking position).
is maintained.

Next, when the operating lever 4 is pushed back to release the brake, the contact wall portion 42 of the operating lever 4 pushes the other end 62 of the coil spring 6 downward, and when the operating lever 4 is pushed back and folded down, the auxiliary lever 5 is stopped, and the relative displacement of the operating lever 4 displaces the other end 62 in the direction of loosening the tightening force of the coil spring 6, so that the restraint of the auxiliary lever 5 is loosened and released together with the operating lever 4. When the operating lever 4 returns from the braking position to the release position shown in FIG.
Since 1 is pushed downward, the auxiliary lever 5 is also the operating lever 4.
In conjunction with this, the cable C is rotated counterclockwise from the braking position toward the release position shown in FIG. 1, and as a result of this rotation, the cable C is also returned to the release position shown in FIG.

In the above embodiment, the coil spring 6 is used as the lock helix, but a hard, elastic and flexible material such as wire or plastic wire may also be used as the lock helix.
Furthermore, in the embodiment described above, one end of the spring provided on the auxiliary lever engages with the operating lever so as to bias the other end of the lock band. It may be provided on the auxiliary lever so as to bias it.

According to the parking brake device according to the present invention, when the operating lever is pulled up to brake both left and right wheels, one end of the lock spiral is displaced in the direction in which the tightening force of the lock spiral wrapped around the drum is loosened, and In the braking state where the operating lever is pulled up, the locking spiral body is tightened to the drum to hold the operating lever in the braking state where the cable is pulled, thereby maintaining the operating lever in the braking state. Therefore, there is no need for a ratchet plate having a sector or an engaging pawl that can be engaged with the sector, and at the same time, when pushing back the operating lever, a part of the operating lever moves in the direction of loosening of the locking spiral and other parts of the locking spiral. The end is configured to be displaced, and there is no need for a release button to release the engagement between the sector and the locking pawl, so the structure is extremely simple and the operation is easy.
Furthermore, a parking brake device that can be operated steplessly is obtained.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention; FIG. 1 is a front view, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a right side view of FIG. FIG. 4 is an exploded perspective view. 2...Drum, 3...Parking brake lever, 4...Operation lever, 5...Auxiliary lever, 6...
...Coil spring (lock spiral), C...Cable,
S...Spring, 21...Pivot, 61...One end of the coil spring (one end of the locking spiral), 62...
The other end of the coil spring (the other end of the locking helix).

Claims (1)

[Scope of claim for utility model registration] A parking brake device that brakes wheels by operating a cable using a parking brake lever, which includes a drum fixed to a base fixed to the vehicle body;
A lock spiral made of a hard elastic material is wound around the drum, and the parking brake lever is provided with an operating lever pivotably mounted on the drum, and a pivot of the operating lever. The operating lever is pivoted on the same axis, and in the direction of raising the operating lever, a part of the operating lever contacts and can be interlocked, while in the direction of lowering the operating lever, it escapes and can be relatively displaced. and an auxiliary lever disposed adjacent to the wheel and connected to a cable extending to the wheel, and the lock spiral body has one end fixed to the auxiliary lever and is operated by pulling up the operating lever during braking operation. When the auxiliary lever is engaged, the one end is displaced in the loosening direction, and when the auxiliary lever receives a braking reaction force from the cable, it is wound around the drum in the tightening direction, and the other end is displaced in the direction of loosening the operating lever. The auxiliary lever is provided with a spring that urges the other end of the locking spiral in the tightening direction, and when the operating lever is pushed back and tilted when the brake is released.
A parking brake device characterized in that the part of the operating lever displaced relative to the auxiliary lever pushes the other end and displaces the lock spiral in a loosening direction.