JPS6130930Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a release mechanism for a foot-operated parking brake, and in particular, the invention relates to a release mechanism for a foot-operated parking brake, and in particular, a pawl that fits into the ratchet wheel of a parking pedal to prevent the pedal from returning, and a mechanism that includes a pawl and a ratchet. The present invention relates to an arrangement structure for a return spring that maintains the release lever and cable in a non-operating state in a release mechanism consisting of a release lever that unfits from a wheel portion and a release cable that rotates the release lever.

Conventionally, in the return spring arrangement structure of this type of release mechanism, for example, as shown in FIG.
Each end of the spring was supported by being engaged with a stop 31' of the petal bracket 2' and a stop 32' of the release rod 30'. (In addition,
1' is a parking pedal, 5' is its ratchet wheel portion, 6' is a pawl, and 9' is a release lever. ) However, such a structure requires special space for the return spring,
Furthermore, if the stop portion 31' of the petal bracket 1' and the hook portion 37' are required for the return spring, and the mounting space is limited, there is a problem that the degree of freedom in setting the spring is reduced.

In another conventional example, as shown in FIG. 2, for example, a return spring 36' is disposed near the manual knob 33' of the release rod 30' between a rod bracket 34' and a collar 35' that is integral with the rod. There is something. However, in such a structure,
In some cases, it may not be possible to provide sufficient space for the spring 36', and in the case of a release mechanism that uses a release cable, which is the subject of the present invention, the portion of the cable up to the release lever may be disconnected when not in operation. There was a risk that the release lever 9' would be insufficiently positioned in the non-operating state due to slack, and the release lever would become loose.

The purpose of the present invention is to provide a release mechanism for a foot-operated parking brake in which the release lever is operated by a cable, in which the return spring that biases the release lever and cable to a non-operating state can be provided in less space and with a simpler structure. It is to be arranged at.

The gist of the configuration of the present invention is that a coiled return spring is arranged in a spiral manner around the axis of the release cable in an area around the outer periphery of the release cable adjacent to the release lever, which is originally a dead space.

Hereinafter, an embodiment of the present invention will be described. In FIG. 3, a parking pedal 1 is pivotally connected to a petal bracket 2 integral with the vehicle body by a shaft 3, and a parking cable 4 connected to a parking brake body (not shown) is engaged. It is stopped and has a ratchet wheel portion 5 in part. A pawl 6 that fits into the ratchet wheel portion 5 is pivotally connected to the bracket 2 via a shaft 7. that ball 6
The fitting is achieved by the elastic force of the spring 8.
Therefore, the parking pedal 1 is allowed to rotate in the clockwise direction of pulling the parking cable 4, that is, in the direction of depressing the pedal, but is prevented from rotating in the opposite direction.

Further, in parallel with the pawl 6, a release lever 9 is pivotally connected to the bracket 2 by a shaft 10. This release lever 9 has a tongue piece 11 that comes into contact with the pole 6.
When the lever itself is rotated counterclockwise, the pawl 6 is rotated in the same direction via the tongue piece 11 and detached from the ratchet wheel portion 5. A release cable 12, which can be pulled and operated in the operator's cab, is connected to the release lever 9 via a resin bush 13, and the release lever 9 is rotated by pulling the cable. That is, as shown in FIGS. 4 to 6, the notch 1 of the rib 14 is integrated with the release lever.
A resin bush 13 is attached to 5, and the release cable 12 loosely passes through the flap-shaped through hole 16, and the release cable 12 passes through the flap-shaped through hole 16 through one opening 17 of the flap-shaped hole.
The pole-shaped stopper portion 18 of the release cable 12 is held in place without causing significant friction. Also,
Regarding the middle part of the release cable 12, there is also a bush 13' having the same structure as the bush 13 mentioned above.
It is supported by the cable bracket 19 via.

Note that the bush 13' is connected to the outer tube 21 by a clip 20.

A coiled return spring 22 for maintaining the release lever 9 in the returned state and pulling and releasing the release cable 12 is arranged adjacent to the release lever 9 so as to draw a spiral with the release cable 12 as the axis. Butsuyu 1
3 and the outer peripheral part 23 or conical part 24 of the bush 1.
3' is positioned by the outer peripheral part 23' or conical part 24'. Then, the release lever 9 is biased clockwise.

That is, the return spring 22 is compactly arranged using the outer circumferential area of the release cable 12 adjacent to the release lever 9, which is originally a dead space, without requiring any special space for arrangement.

In the operation of such a foot-operated parking brake, when the parking pedal 1 is depressed, the pedal rotates clockwise without the pole 6 engaging with the ratchet wheel portion 5, pulling the parking cable 4 and activating the parking brake.

The parking pedal 1 is prevented from returning to its original position by fitting the pawl 6 into its ratchet wheel portion 5, and is maintained in the parking operating state.

Next, to release the parking brake, pull the release cable 12 in the driver's cab, the release lever 9 will rotate counterclockwise against the elastic force of the return spring 22, and the tongue piece 1
1, the pawl 6 is rotated counterclockwise and disengaged from the ratchet wheel portion 5, and the parking pedal 1 is lifted by its own weight and a petal spring (not shown).
to return it to its original position and release the parking brake. In the above action, when the release cable 12 is pulled and the release lever 9 is rotated counterclockwise, the return spring 22 curves in a waveform, but since the return spring 22 is positioned by the outer circumferential portion 23 or the conical portion 24 of the bush 13, the spring itself is supported in a stable state. In addition, the rib 14 of the release lever 9 is provided with a resin bush 13.
This prevents interference between the release cable 12 and the release cable 12, and the lug-shaped through hole 16 of the bush prevents local bending of the cable itself, thereby preventing fatigue failure of the release cable 12.

As described above, the present invention has a return spring for maintaining the release lever in the returned state and releasing tension on the release cable, by arranging it in the area around the outer periphery of the release cable adjacent to the release lever, which is originally a dead space. The return spring can be installed with less installation space and with a simple structure. Therefore, the present invention does not require additional space for the return spring.

In addition, in this invention, what drives the release lever is a cable, and cables are generally highly flexible, so even if there are any parts between the release lever and the manual knob, the release cable can be routed by bypassing those parts. It can be arranged. Therefore, there are no restrictions on the arrangement of components.

Also, since the present invention has a pole, there is no need for the inconvenience of the manual knob moving in and out every time the pedal is stepped on. Also, don't overlook the fact that the reason you don't have the inconvenience of having the manual knob move in and out every time you step on the pedal is that the cable drives the release lever, and the cable is flexible, so it absorbs the movement of the ratchet. I can't.

Furthermore, since the cable is flexible, a very thin cable can be used. Therefore, the device of the present invention is lighter.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing the return spring arrangement structure of a conventional foot-operated parking brake;
FIG. 3 is a diagram showing the entire foot-operated parking brake according to the embodiment of the present invention, and FIGS. 4 to 6 are diagrams showing only the main parts of the embodiment of the present invention. 1...Parking pedal, 5...Ratchet wheel section, 6...Pole, 9...Release lever,
12...Release cable, 21...Outer tube, 22...Return spring.

Claims (1)

[Scope of utility model registration request] A release mechanism for a foot-operated parking brake includes a pawl that resiliently engages with a ratchet wheel portion of a parking pedal to prevent the pedal from returning, and a mating mechanism between the pawl and the ratchet wheel portion. It consists of a release lever to be released, and a release cable that is locked to the release lever and rotates the lever, and the release cable is disposed in an outer tube, and a part of the release cable is exposed from the outer tube. and extends toward the release lever;
A coil-shaped return spring is disposed between the release lever and the outer tube to bias the release lever into a non-rotating state, and the release cable is inserted into the return spring coaxially with the return spring. A foot-operated parking brake release mechanism characterized by being penetrated.