JP2914509B2 - Foot-operated parking brake device - Google Patents

Description

The present invention relates to an improvement in a foot-operated parking brake device.

[Prior Art] In a conventional foot-operated parking brake device, the direction of the line of force of a release cable that transmits a releasing force for releasing the engagement between a ratchet wheel and a pawl member, and a pivot shaft that is a swing center of a releasing arm. Is almost constant between the start of the release and the completion of the release, so that the release operation force is also generally constant.

However, in such a conventional foot-operated parking brake device, the distance does not change between the start of release requiring a large release force and near the completion of release, which may be a small release force. Increasing the distance to reduce the initial release force increases the pulling distance for pulling the release cable, and conversely, if the pulling distance of the release cable is shortened, the distance H must be reduced, and the release force is reduced. There is a problem that needs to be solved because it becomes larger and it becomes difficult to release the brake.

The fact that the release force is large in the former at the beginning and at the time of completion of the brake release and then gradually becomes smaller will be described below with reference to FIG.

In the figure, θ: claw member operating angle P: release resistance F: tread force applied to the foot lever L2: distance from the foot lever pivot shaft to the pedal (point of application) W: brake response force (applied to the claw tip of the claw member) Drag: μ: Coefficient of friction, the relationship between the release resistance force P and the brake response force W is as follows.

The above analysis results are illustrated in FIG. In the figure, the release resistance force P is made dimensionless to be P1.

As shown in the drawing, the release resistance P decreases as the operating angle θ of the claw member increases, while the pulling distance S of the release cable (indicated as the operating stroke of a knob provided at the rear end of the release cable in the figure). Is gradually increasing.

The present invention has been made in view of such problems in the prior art, and the brake can be released with a small releasing force even at the initial stage of releasing the brake requiring a large releasing force,
In addition, it is an object of the present invention to provide a foot-operated parking brake device having a brake release mechanism in which a release cable pulling distance is small.

Means for Solving the Problems The gist of the present invention for achieving the above object is that a foot lever pivotally supported by a support bracket fixed near the floor of an automobile, and one end of the foot lever A control cable, which is fixed to the step lever and transmits the braking force; and A claw member pivotally supported by the support bracket and meshing with the ratchet wheel to lock the foot lever; and a presser engaged with a swing end of the claw member. A foot-operated parking brake device, comprising: a release arm pivotally movably supported; and a release cable fixed to a stop point of a swing portion of the release arm and transmitting a release force. A shaft-side member pivotally supported by the swinging shaft, and a cable fastening member pivotally attached to the vicinity of the distal end of the shaft-side member so that a release cable is fastened to an intermediate portion thereof; The cable fastening member is pivotally attached to the shaft-side member so as to be bent in a direction opposite to the pulling direction of the release cable, and ends of both members are restrained at a relative predetermined angular position in the pulling direction. The foot-operated parking brake device is characterized in that a stopper is fixed to the support bracket so that the cable fastening member abuts and bends during the releasing arm releasing step.

"Action" When the release cable is pulled to release the brake, the release arm attempts to rotate about its pivot axis.

Since the end of the shaft side member and the cable fastening member constituting the release arm are in contact with each other and are restrained at a predetermined angular position relative to the pulling direction of the release cable, they are united at the beginning of release. The release arm rotates and the distance between the release force line and the pivot axis of the release arm is large, and a large release rotational force can be obtained with a small release force.

The release arm is gradually rotated by being pulled by the release cable, and the presser fixed to the tail end presses the tail end of the claw member to rotate the claw member.

Since the pulling direction of the release cable is substantially constant, the distance between the direction and the pivot axis of the release arm gradually decreases. When a certain swing angle is reached, the distal end of the cable fastening member comes into contact with the stopper and is prevented from advancing.

However, since the stopping point of the release cable is provided between the stopper and the pivot point of the two members constituting the release arm, the release arm is bent at the pivot point of the two members, and the beak of both members is bent. The joint is released, and thereafter, only the shaft side member acts as the release arm.

On the other hand, the release resistance generated at the meshing portion between the locking teeth of the ratchet wheel and the pawl of the pawl member is the largest when the meshing state is complete,
Since it gradually decreases with the rotation of the claw member, even if the release rotational force of the release arm is reduced, the engagement state can be released against the release resistance force.

In addition, the pulling amount of the release cable is large when both members constituting the release arm are integrally long, and when only the shaft side member is used, the stopper of the cable fastening member is centered at the distance between the stopper and the release cable. Multiplied by the increment of the swing angle, which is extremely small,
The release arm is smaller overall than in the case of a single solid.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

The foot-operated parking brake device 10 is provided with a foot-operated lever 13 rotatably supported by a support bracket 11 fixedly mounted by a mounting bolt 12 near the floor of the vehicle, and fixedly provided on the foot-operated lever 13. The release cable 40 is provided with a claw member 17 that meshes with the locking teeth 15a of the ratchet wheel 15 to hold the braking force, and a pressing element 34 that presses the swing end 17b of the claw member 17 at the swing tail. It comprises a release arm 30 and a control cable 25 whose rear end is engaged with the foot lever 13 and wound around a control cable guide member 24 fixed to the foot lever 13 to transmit a braking force.

The tip of the foot lever 13 has a tread 14 in the direction of the operator's leg.
A pedal 14 facing a is fixed, and a control cable guide member 24 is fixed so as to wind around a pivot shaft 16, and similarly, a locking tooth 15 a of a ratchet 15 around the pivot shaft 16. Is engraved.

A claw member 17 having a claw 18 to be engaged with the ratchet wheel 15 is pivotally supported by a pivot shaft 19 of the claw member, and an elongated arm is provided.
The swinging end 17b of 17a is in contact with the pressing element 34 of the release arm 30. A spring 20 is attached to an end 17c of the claw member 17 opposite to the arm 17a, so as to always bias the claw 18 of the claw member 17 to a side meshing with the locking teeth 15a of the ratchet wheel 15.

The release arm 30 is pivotally supported by a pivot shaft 34a of the release arm so as to be swingable, and a shaft-side member 31 having a presser 34 fixed to a swing tail portion.
And a cable tie having a lock point 38 which is a rocking portion which is pivotally supported by the pivot pin 36 on the shaft side member 31 and is provided at a middle portion of the entire length to lock the distal end of the release cable 40. Member 35
And consists of The cable fastening member 35 is pivotally attached to the shaft side member 31 so as to be able to bend in a direction opposite to the pulling direction of the release cable 40.

As shown in FIG. 2, the release arm 30 constituted by the shaft side member 31 and the cable fastening member 35 is restrained at a relative predetermined angular position in the pulling direction when pulled by the release cable 40. The ends 37a and 37b that abut are both members 31,
35 are provided.

On the other hand, the support bracket 11 is provided with a stopper 39 that bends by contacting the end of the cable fastening member 35 when the release arm 30 rotates by a predetermined angle.

The release cable 40 is connected to the release arm 30 at a stop connection point 38, and a release knob (not shown) is provided at the other end.

The control cable 25 is fixed at one end to the foot lever 13, is disposed along the control cable guide member 24, and extends along the vehicle body, and transmits a braking force corresponding to the amount of depression of the foot lever 13. ing.

 Next, the operation will be described.

When the pedal 14 is depressed, the foot lever 13 rotates clockwise in FIG. 1 around the pivot 16 to transmit a braking force corresponding to the amount of depression to the control cable 25. On the other hand, since the pawl member 17 is always urged toward the ratchet wheel 15, when the foot is released from the pedal 14, the locking teeth 15 of the ratchet wheel 15 are at that position.
a meshes with the claw 18 of the claw member 17 to prevent the foot lever 13 from returning, and a brake state is set.

In the braking state, a constant braking force W corresponding to the braking force is applied to the tip of the claw 18 of the claw member.

When releasing the release knob provided at the rear end of the release cable 40 to release the brake state, the pulling direction of the release cable 40 and the release arm 30
The distance from the pivot shaft 35 is H1 as shown in FIG.

When the release cable 40 is continuously pulled, the release arm 30 itself also turns counterclockwise while turning the claw member 17 counterclockwise via the pressing element 34. The pulling direction of the release cable 40 hardly changes, and eventually the cable fastening member 35
Abuts against the stopper 39.

When the release cable 40 is further pulled as it is, the release arm 30 bends around the pivot pin 36 and ends 37a, 37b.
Are separated from each other, and the release arm 30 moves almost as if only the shaft-side member 31 is provided.

That is, the release arm 30 has the arm length H1 until it comes into contact with the stopper 39, and becomes H2 after the contact. Therefore, the release rotational force of the release arm 30 increases at the start of release, and decreases in the latter half of the release operation. And presser
The same is transmitted to the claw member 17 through 33.

This is consistent with the previous analysis result, and there is no waste in the release force to be applied. In addition, although the pulling amount of the release cable 40 is large at the beginning, after abutting on the stopper 39, the distance h1 between the stopper 39 and the release cable 40 is multiplied by the increment of the swing angle of the cable fastening member 35 about the stopper 39. And extremely small.

[Effect of the Invention] According to the foot-operated parking brake device of the present invention, the brake can be released with a small releasing force even at the beginning of releasing that requires a large releasing force, and the amount of pulling of the knob for releasing can be reduced. Thus, the brake release operation of the foot-operated parking brake device becomes extremely easy.

[Brief description of the drawings]

1 and 2 show one embodiment of the present invention,
FIG. 1 is a front view of a foot-operated parking brake device, FIG. 2 is an explanatory diagram of an operation of a release arm, FIG. 3 is an explanatory diagram for analysis of engagement between a ratchet wheel and a pawl member, and FIG. FIG. 10: Foot-operated parking brake device 11: Support bracket, 13: Foot-operated lever 15: Claw wheel, 15a: Locking teeth of the claw wheel 16: Pivot shaft, 17: Claw member 17b: Claw Swinging end of member 25 Control cable 30 Release arm 31, Shaft side member 32 Tail end of release arm 34 Presser 34a Pivot shaft of release arm 35 Cable stop Connection member, 36… pivot pin 38… release cable stop point 39… stopper, 40… release cable

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60T 7/06 G05G 5/24

Claims (1)

(57) [Claims] 1. A foot lever pivotally supported by a support bracket fixedly mounted near a floor of an automobile; a control cable having one end fixed to the foot lever to transmit braking force; and a pivot shaft of the foot lever. A tab wheel provided concentrically with the foot lever and having a number of locking teeth engraved thereon, pivotally supported by the support bracket so as to be swingable, meshing with the tab wheel, and A release member that has a presser that engages with a swing end of the claw member, and that is pivotally supported by the support bracket so as to be pivotable; A foot-operated parking brake device comprising a release cable fixed to a connection point and transmitting a release force, wherein a shaft-side member pivotally supporting the release arm on a swing shaft thereof,
A cable fastening member pivotally attached to the vicinity of the distal end of the shaft-side member and a release cable being fastened to an intermediate portion thereof, wherein the cable fastening member is released with respect to the shaft-side member. In addition to pivotally connecting the cable in a direction opposite to the pulling direction of the cable, the ends of both members are brought into contact with each other so as to be restrained at a relative predetermined angle position in the pulling direction. A foot-operated parking brake device, wherein a stopper that is bent by contacting the cable fastening member is fixed to the support bracket.