JPS5827136B2 - Two-operation release stick type parking brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cane-type parking brake for automobiles, and more specifically, to increase safety during parking by making the release mechanism of the parking brake operating handle a two-stage operation type. This is the purpose.

With conventional cane-type parking brakes, there is a risk that the parking brake may be released against the driver's will if the operating handle is turned due to something such as a limb or object coming into contact with the operating handle while parking. There was that.

(For example, Utility Model Publication No. 46-23054 by the present applicant “
The parking brake automatic return device is no exception.

) In order to eliminate the drawbacks of the conventional parking brake, the present invention is designed to prevent the parking brake from being released even if the operating handle is accidentally turned by a limb or an object. In addition, the brake release preliminary operation by the operating handle is not a single operation (for example, rotation of the handle) as in the prior art, but requires a different kind of two-stage operation.

However, such a two-operation release stick-type parking brake operating handle existed before the present invention.

(See, for example, Japanese Patent Application No. 1983-90105, ``Two-operation release stick type parking brake,'' co-filed by the present applicant and Nissan Motor Co., Ltd.).

The essential preliminary action when releasing a cane-type parking brake from the applied state is to remove the pawl from the teeth of the operating rod, but this action cannot be performed by a single action such as rotating the operating bundle. prevent it from happening,
The above feature is such that the pawl is released from the teeth of the operating rod only by pulling the operating bundle toward you and then rotating it, and then the brake is released by pushing the bundle in the direction of releasing the brake. Gansho 52
This was the mechanism described in the specification of the application No.-090105.

In order to achieve the same object as the above-mentioned application, the present invention has the structure of the operating rod that is the same as the original simple structure of the stick-type parking brake, that is, a solid rod shape, and the operation of removing the pawl from the teeth is performed by the second part of the operating bundle. It is designed so that it can be performed for the first time through manipulation.

Therefore, the two-operation release stick-type parking brake according to the present invention can have relatively few additional parts compared to the basic stick-type parking brake, and can achieve the purpose of two-operation release with a simple structure.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a two-operation release stick type parking brake according to the present invention will be exemplified with reference to the accompanying drawings.

FIG. 1 is an overall perspective view showing the external appearance of a two-operation release stick type parking brake according to the present invention, in which the two-operation release mechanism 10 is constructed relatively compactly (details will be described later), and other overall configurations are shown. That is, the operating rod 1, the guide tube 2, the guide pin 4 fixed to the end of the bundle 3, the guide groove 5 on the upper surface of the guide tube, the guide tube support bracket 6.7, and the pin 8 that supports the guide tube (illustration) In this case, it also serves as a pivot pin for the claws and other parts that will be described later.

) etc. are generally the same as the basic format of conventional stick type parking brakes.

In other words, in the two-operation release stick type parking brake according to the present invention, by performing two different operations (pulling and rotation) on the bundle 3, the pawl is connected to the tooth of the operating rod via the two-operation release mechanism 10 described below. It is meant to separate from the

At the final position of brake release, the guide pin 4 of the operating lever 1 is guided by the guide groove 5, and the operating lever is rotated back to the bundle angle during the braking operation, as in the conventional case.

Next, the details will be explained with reference to FIG. 2, which shows the two-operation release mechanism 10 of FIG. 1 in an expanded form.

In FIG. 2, the operating rod 1, guide tube 2, bundle 3, guide groove 5, and pin 8 are the basic parts shown in FIG. 1 and do not require any special explanation.

The upper surface of the operating rod 1 in the position shown in FIG. The trough line 9' of the tooth may be an arc not concentric with the operating rod.

The reason will become clear later.

The operating rod 1 has a non-circular cross section (in the illustrated figure, an oval shape with parallel straight sections on both sides), and a cam 12 having a fitting hole 11 of the same shape is fitted therein so as to be freely slidable in the axial direction.

The cam 12 adjusts the maximum rotation angle (for example, 90°) of the operating rod 1.
The cam surface 13 is formed into an appropriate shape so that its height changes with respect to the axis of the operating rod within a range of .

Although this cam 12 is shown pulled out from the guide tube 2 to clearly show its connection with the operating rod 1,
In the assembled state, as shown by the imaginary line 12', the cam ring 14 is located within a cam surround 14 that forms an integral part of the guide tube 2 and projects in the shape of a substantially semicircular brim, allowing the limited rotation described above. You will understand.

Therefore, the operating rod 1 is rotatably inserted into the guide tube 2 while being supported by a bearing portion 15 formed integrally with the cam enclosure 14 .

However, when the cam 12 is rotated in a limited manner in this manner, it is necessary to prevent the pawls from coming off the teeth 9 of the operating rod 1 as in the conventional stick-type parking brake.

This causes the tooth 9 of the operating rod to be at least 1 circumferential angle as described above.
400, and preferably the tooth valley line 9
This is the reason why ′ is an arc that is non-concentric with the operating rod.

In this case, it is desirable that the tip of the claw also have a concave shape that matches the curvature of the valley line of the tooth.

Next, in the developed view of FIG. 2, a pin 8 is horizontally inserted into a pair of brackets 16 that integrally extend upward from the guide tube 2, and a claw 17 is supported by its legs in a normal manner so as to be pivotable. and its tip 18 is arranged to engage the teeth 9 of the operating rod 1, and a lever-shaped intermediate arm 22 is pivoted on the pin 8 between the legs of the claw, one of the arms 22' The lower surface of the hook 24 has a claw 17.
is placed so that it is in contact with the

Unlike the conventional pawl, which has a coil spring between it and the bracket 16 of the operating rod to constantly press the pawl against the operating rod 1, the pawl 17 in the present invention is connected to the bracket 16 of the operating rod.
The rotational force is not directly received by the coil spring 20 whose one end 19 is engaged with the notch or hole 19', but is received by another coil spring 23 via the intermediate arm 22.

That is, the other end 21 of the coil spring 20 is connected to the intermediate arm 2
2 in the clockwise direction in FIG. 2, one end of the coil spring 23
The other end of the arm 22'' is engaged with the hook 24 of the claw 17 from the inside.

These coil springs 20 and 23 each loosely fit their coil portions coaxially with the pin 8, for example, on the outer surface of the bearing collar 25 of the intermediate arm 22;
The latter acts to push the arm 22' of the intermediate arm 22 clockwise in FIG.
A relatively weak force is applied in the direction of pressing the catch portion 24 of the claw 17.

Further, the cam surface 13 of the cam 12, which is slidable in the axial direction with respect to the operating rod 1 but rotates integrally with the rotation of the operating rod, engages with the lower surface of the arm 22' of the intermediate arm 22. placed in position.

3A, 3B, 3C, and 3D are enlarged side views for explaining the operation of the two-operation release mechanism 10 according to the present invention, and FIG. 3A shows the parking brake operating state (intermediate The arm 22 and the claw 17 are pressed together by the force of the spring 23, sandwiching the catch 24 of the claw, and the entire body is pressed clockwise by the force of the spring 20, so that the tip 18 of the claw is pressed against the tooth 9. ),
FIG. 3B shows a first operation state for brake release (a state in which the operating handle is rotated counterclockwise in the example diagram and the intermediate arm 22 is pushed down by the cam 12, and FIG. 3C shows another state for brake release). 1 operation state (the operation handle is pulled without rotating), and Fig. 3D shows the state where the two operations (handle rotation and handle pull) to prepare for brake release are performed, that is, Figs. 3B and 3C. A state is shown in which one of the operations is performed as the first operation and the other one is performed as the second operation.

In each figure in Fig. 3, parts that are the same as those in Figs. 1 and 2 are given the same reference numerals, so a detailed explanation of each is not necessary. The operating states of each figure will be explained in turn.

FIG. 3A shows a normal brake operating condition, with the cam 12
Since the cam surface 13 of the intermediate arm 22 does not contact the lower surface of the arm 22' of the intermediate arm 22, the intermediate arm 22
The pawl 17 and the protrusion 24 of the pawl are in pressure contact with each other, and the coil spring 20 as a combination of these pawls and the intermediate arm is pressed by the spring F1 toward the operating rod 1, and the tip of the pawl 17 18 is tooth 9 of operating rod 1
is firmly engaged with.

FIG. 3B shows the first action of releasing the brake (this may be considered an erroneous operation against the driver's will).

) and turn the operating handle 3 counterclockwise (in the case of Fig. 1).
3B, and the intermediate arm 22 is rotated counterclockwise by the cam surface 13 of the cam 12 in the counterclockwise direction in FIG. Unless otherwise, the tip 18 of the pawl 17 will not come out of engagement with the teeth 9 of the operating rod.

In this state, the depressing force F1 by the spring 20 is completely disabled by the cam 12, and the intermediate arm 22 is pushed up by the cam surface 13. 22
However, by making this coil spring 23 a sufficiently weak spring, the restraining force due to the brake reaction force applied by the teeth 9 of the operating rod 1 to the tip end 18 of the pawl is suppressed. In comparison, this rotational force F
This is because 2 can be made sufficiently small.

Therefore, rotate the operating handle clockwise to remove the cam surface 13.
By lowering the brake, the brake will return to a safe braking state.

Next, FIG. 3C shows the first operation of brake release (this is
It may be considered a malfunction that goes against the driver's will.

) shows the case where the operating handle 3 is pulled toward you,
In this case, unless the handle is rotated as the second action, the pawl 17 is pressed against the teeth 9 of the operating rod together with the intermediate arm 22 by the relatively strong coil spring 20 which acts as an original pawl spring. , if you stop pulling the handle, the safe braking state will be restored again.

Further, as a second operation, when the handle is rotated, the cam 12 lifts the intermediate arm 22 in the same way as shown in FIG. The force F of the coil spring 23 is weak enough to cause
2, the pawl 17 is lifted until it presses against the intermediate arm 22.

FIG. 3D shows this state, in other words, this is the state in which the two-operation type release preparation operation has been completed, and from now on, the S handle 3 is left to the brake reaction force and held out forward to park the vehicle. The brake is released.

Of course, it will be easily understood that in the above two operations, if the first operation is shown in FIG. 3B, if the handle is pulled in that state, the state shown in FIG. 3D will be achieved.

The two-operation release mechanism of the stick-type parking brake according to the present invention has been exemplified above, but the shape, arrangement, etc. of each part, for example, the claw Those skilled in the art will readily understand that many variations can be made in the shape, the shape and circumferential angle of the teeth, the shape of the intermediate arm (e.g., eliminating arm 22'), the direction of rotation of the cam and handle, etc. Dew.

[Brief explanation of the drawing]

1 is an overall perspective view showing a two-operation release stick type parking brake according to the present invention; FIG. 2 is an exploded perspective view showing the components of the two-operation release mechanism in FIG. 1; 3A, 3B, 3C, and 3D are enlarged side views for explaining the operation of the two-operation release mechanism according to the present invention. 1... Operating rod, 2... Guide tube, 3... Handle, 4... Guide pin, 5... Guide groove, 6゜7...Bracket, 8...Pin, 9...Teeth, 10...
...Two-operation release mechanism, 12...Cam, 13
...cam surface, 16...a pair of brackets, 17...claw, 18...claw tip,
20... Coil spring, 22... Intermediate arm, 23... Coil spring, 24...
Claw hook part.

Claims (1)

[Claims] 1. A guide tube 2 fixed to the body of an automobile; an operating rod 1 rotatably inserted into the guide tube, having a parking brake cable fixed to one end and an operating handle 3 at the other end; A cane-type parking brake having a pawl 17 that is pivotally supported 8 on a pair of brackets 16 extending upward from the guide tube and engages with a large number of teeth 9 on the operating rod, the pawl 17
an intermediate arm 22 pivotally supported between both legs of the intermediate arm 22, one end 19 of which is hooked to one of the brackets 16, and the other end 21 of which is hooked to one arm 22' of the intermediate arm 22;
A spring 20 acts to rotate the intermediate arm 22 in a direction to bring it closer to a hook 24 provided near the tip of the claw 17; one end is hooked to the intermediate arm 22 and the other end is attached to the The latching portion 24 provided near the tip 18 of the claw 17
a spring 23 which acts to rotate the pawl 17 in a direction toward the one arm 22' of the intermediate arm 22; a cam 12 that is movably but relatively unrotatably fitted and held at a fixed position in the axial direction with respect to the guide tube 2; By rotating the operating handle 3, the intermediate arm 22
engaging said one arm 22' of said intermediate arm 2
A two-operation release type stick type parking brake, characterized in that the two-operation release stick type parking brake acts to rotate the lever 2 in a direction away from the pawl 17.