JP2003237552A - Foot parking brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long hole sliding toggle type foot parking brake device having a small loss stroke and a simple structure. <P>SOLUTION: The brake device has a ratchet plate 6 attached to a pedal body 4 of a foot brake pedal rockably supported by a spindle 3 and teeth of a ratchet pole 8 slidably mounted to a pivot pin 7 are engaged with the ratchet plate and a shaft hole of a ratchet pole for inserting the pivot pin is formed at a slot 9. A toggle spring 12 is arranged to provide the ratchet pole with rotational force. In the brake device capable of performing braking operation and brake releasing operation by sliding the ratchet pole along the slot with the rotational force and stepping force of the pedal body, a momentary center of rotational movement ΘPS of the ratchet pole is positioned in an area of the ratchet pole side of the spindle. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foot-operated parking brake device provided mainly in an automobile.

[0002]

2. Description of the Related Art Conventionally, as a parking brake device of this kind, a ratchet plate is attached to a pedal body of a foot brake which is operated by a foot and swings around a support shaft, and teeth of a ratchet pole are rotatably attached to a pivot pin. It is known that the ratchet plate is engaged with the ratchet plate, a shaft hole of the ratchet pole through which the pivot pin is inserted is formed into an elongated hole, and a toggle spring for giving a turning force to the ratchet pole is provided. In the device, the ratchet pole slides along the elongated hole due to the turning force and the depression force acting on the pedal body, and the brake operation and the brake release operation can be alternately performed by depressing the pedal body.

An example thereof is as shown in FIGS. 1 and 2, in which a pedal body a and a ratchet pole b are swingably and rotatably mounted on a mounting base c fixed to the vehicle body of an automobile by a spindle d and a pivot pin e. The ratchet pole b rotated by the toggle spring f meshes with the ratchet plate g provided on the pedal body a in a freely disengageable manner. The ratchet pole b is attached to the pivot pin e by an elongated hole h formed in the ratchet pole b, and when the pedal body a is depressed for brake operation, the ratchet pole b is elongated hole as shown by a solid line in FIG. When the left end of h is engaged with the pivot pin e and the pedal body a is released, the ratchet pole b is pushed by the restoring swing force acting on the pedal body a as shown by the dotted line in FIG. The right end of the long hole h slides so as to engage with the pivot pin e, and the ratchet pole b continues to mesh with the ratchet plate g so as to stop the pedal body a at the brake operating position. When the pedal body a is stepped on again in this state, the ratchet pole b is toggle spring f.
When the pedal body a is released from the engagement by the force of, and the foot is released from the pedal body a, the pedal body a returns to the brake release position by the return spring i. The pedal body a has
Although not shown, a brake wire connected to the brake is connected and the brake is applied when the pedal body a is depressed.

[0004]

In such a foot-operated parking brake device, the ratchet pole b that meshes with the ratchet plate g is a pivot pin e.
Since it slides along the length of the long hole h, the meshing point returns, and the pedal body a has the result that the depression amount returns by the amount of the return. This return length is called loss stroke and reduces the amount of operation applied to the pedal body a, so it is desirable that this is as small as possible. It is also desired that the device has a simple structure and can be manufactured at low cost.

An object of the present invention is to provide an elongated hole slide toggle type stepping parking brake device having a small loss stroke and a simple structure.

[0006]

According to the present invention, a ratchet plate is attached to a pedal body of a foot brake pedal which is swingably supported by a support shaft, and teeth of a ratchet pole rotatably attached to a pivot pin are attached to the ratchet plate. The ratchet pole through which the pivot pin is inserted is formed into a long hole, and a toggle spring for giving a turning force to the ratchet pole is provided, and the ratchet pole is provided by the turning force and the pedaling force of the pedal body. In a brake device of a type that allows the pedal body to perform a brake operation and a brake release operation by sliding along the elongated hole, in the region of the support shaft on the ratchet pole side, the moment of rotational movement of the ratchet pole. By positioning the center, the above object was achieved. The vertical bisector of the longitudinal axis of the slot is set so as to intersect with the line connecting the spindle and the center point of the tip radius of the ratchet pole, so that the rotational movement center is located in the region. Or the position where the ratchet pole completes the engagement with the ratchet plate, the vertical bisector of the longitudinal axis of the slot and the vertical bisector of the slot are on the pedal body side of the slot. The angle formed by the line that connects the center point of the addendum radius with the point of intersection with the inner wall surface is set to the slidable angle of the ratchet pole, overcoming the frictional resistance between the inner wall surface of the slot and the pivot pin. Also, the above object can be achieved.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings. In FIGS. 3 to 5, reference numeral 1 indicates a footstep parking brake device fixed to a vehicle body of an automobile by a mounting frame 2. , A pedal body 4 of a foot brake pedal is swingably attached to a support shaft 3 provided on the mounting frame 2, and when the pedal body is stepped, the pedal body swings against a return spring 5 and is connected to the pedal body 4. A wire (not shown) is pulled to activate the brake. A ratchet plate 6 is integrally attached to the pedal body 4, and teeth of a ratchet pole 8 rotatably attached to a pivot pin 7 of the attachment frame 2 mesh with the teeth of the ratchet plate 6.

The pivot pin 7 is inserted into an elongated hole 9 formed in the ratchet pole 8, and a leg of a toggle spring 12 is engaged with a spring hole 10 formed in the ratchet pole 8 and a spring hole 11 of the mounting frame 2. Combine the ratchet pole 8
The turning force and the sliding force are applied to the. 13 is a stopper for restricting the rotation of the ratchet pole 8, and 15 is a toggle spring 12 so that the ratchet pole 8 can be engaged again by the returning operation of the pedal body 4 when the ratchet pole 8 is out of engagement with the ratchet plate 6. A control arm integrated with a pedal body 4 for switching and controlling the direction of force.

Such a structure is almost the same as the conventional one, and when the pedal body 4 is not depressed and the brake is released, as shown in FIG.
6 and the ratchet pole 8 are disengaged, and when the pedal body 4 is stepped on for parking, the ratchet pole 8 is lifted and the pivot pin is attached at the left end of the slot 9.
7 and the turning force of the toggle spring 12 acts so as to mesh the teeth of the ratchet pole 8 with the ratchet plate 6, so that the ratchet plate 6 and the ratchet pole 8 mesh as shown by the solid line in FIG. Like When the pedal is stopped and the foot is released from the pedal body 4, a relatively large restoring force in the opposite direction to the pedal body 4 acts on the pedal body 4 due to the brake wire. The ratchet pole 8 that strongly meshes with 6 is pushed back, and as shown by the dotted line in FIG. 4, the pivot pin 7 engages with the right end of the slot 9 to complete the meshing. At this time, the action point 14 of the toggle spring 12 on the ratchet pole 8 is
Move to the bottom of the line connecting the center of the spring hole 11 and the center of the pivot pin 7 and toggle spring 12 to ratchet pole 8
The ratchet plate 6 is disengaged. However, since the return force of the pedal body 4 is large, the engagement cannot be disengaged, but when the pedal body 4 is stepped on again and the return force disappears, the ratchet pole 8 becomes the ratchet plate 6 by the force of the toggle spring 12. The pedal body 4
When the foot is removed from the pedal body 4, the pedal body 4 returns to the original position, that is, the brake release position by the force of the return spring 5.

When the pedal body 4 is stepped on for parking and then the foot is removed, the ratchet pole 8 moves along the slot 9 to cause a loss stroke S2. The loss stroke S2 is the loss stroke S2 of the ratchet pole 8. By positioning the rotational movement instantaneous center ΘPS in the region closer to the ratchet pole 8 than the support shaft 3, it can be made smaller and the operation feeling becomes better. To further explain this, as shown in FIG. 2, conventionally, the rotational movement instantaneous center ΘPS is located in a region on the side substantially opposite to the ratchet pole side of the spindle, and therefore the loss stroke S2 is a long hole. The length was not so different from the moving distance S1 and the moving distance LS of the operating point of the toggle spring was almost the same as S1, but according to the inventor's consideration, the ratchet pole 8 meshes from the meshing start position. The loss stroke S2 is made sufficiently longer than the movement distance S1 by locating the rotational movement instantaneous center ΘPS in the region of the ratchet pole 8 side closer to the ratchet pole 8 side than the spindle 3 when moving to the completion position. It was found that it can be made smaller and the operation feeling is improved.

According to the structure of the present invention, since the instantaneous center of rotation ΘPS is close to the tip of the meshing ratchet pole 8,
S2 / S1 = (distance from center point R of the tooth tip radius of ratchet pole 8 to ΘPS) / (pivot pin 7 of slot 9)
The value of the distance from the support position to ΘPS) can be easily set to, for example, 0.5 or less. Moreover, the moving distance LS of the action point 14 of the toggle spring 12 and the moving distance S1 of the long hole
It is also easy to set the ratio to 1 or more, for example 1.3.
Therefore, the loss stroke S2 can be reduced without using special parts. On the other hand, in the conventional configuration of FIG. 2, the rotational movement instantaneous center ΘPS is farther than the support shaft with respect to the tooth tips of the ratchet pole. Therefore, increasing the value of LS / S1 is advantageous in terms of strength and equipment. It was difficult due to size restrictions, and it was difficult to set the value to 1.15 or more as an actual machine.

The position of the rotational movement instantaneous center ΘPS is
The vertical bisector of the long axis of the oblong hole 9 of the ratchet pole 8 and the intersection point PT between this perpendicular bisector and the straight line portion of the oblong hole 9 and the center point R of the tip radius of the ratchet pole 8 By making the angle ΘE formed by the connecting straight line small, it is possible to easily approach the center point R of the tip radius of the ratchet pole 8. That is, the loss stroke is proportional to the pedal depression loss angle (loss stroke angle) Θ PED, and Θ PED is (S
2 / root radius RRT of ratchet plate 6) is substantially equal, and therefore, the smaller S2 is, the smaller the stroke loss angle is. In the example of FIGS. 3 and 4, ΘE can be set to 10 to 45 °, which allows the instantaneous rotational movement center ΘPS to be set.
Can be made closer to the ratchet pole 8 to reduce the loss stroke, but it is important not to set ΘE to a small angle (friction angle) such that the inner wall surface of the pivot pin 7 and the slot 9 cannot be slid. This friction angle is the pivot pin
7 and the inner wall surface of slot 9 are determined by the material and surface condition, and if this angle is exceeded, ratchet plate 6 of pedal body 4
Even if the ratchet pole 8 is pushed by, the ratchet pole 8 does not slide along the slot 9 and the brake cannot be released. In the conventional type, ΘE is set to a large angle in consideration of the sliding performance of the pivot pin 7 and the long hole 9, and as a result, the rotational movement instantaneous center ΘPS is almost opposite to the ratchet pole 8 of the spindle 3. Located in S
2 was large, the loss stroke was large and the operation feeling was bad.

In order to locate the instant rotational movement instant center ΘPS in the region of the ratchet pole 8 side from the support shaft 3 as in the present invention, the perpendicular bisector of the longitudinal axis of the slot 9 is set to the center of the tip radius. This can be easily done by setting so as to intersect with the line connecting the point R and the support shaft 3.

The instantaneous center of rotation ΘP in the present invention
The position of S may be anywhere in the region from the support shaft 3 to the ratchet pole 8 side, but it is preferable from the design point of view to be located near the line connecting the center point R of the addendum radius and the support shaft 3.

In the example shown in FIGS. 3 to 5, when the pedal body 4 is stepped on with a foot for parking, the ratchet pole 8 slides along the elongated hole 9 and the ratchet by the turning force of the toggle spring 12. The plate 6 and the ratchet pole 8 mesh with each other, the brake wire is pulled, and the brake operates. After that, when the foot is removed from the pedal body 4, the return force of the brake wire acts on the pedal body 4, so that the ratchet pole 8 meshed with the ratchet plate 6 is pushed, and the dotted line in FIG. Slide the S1 distance as shown and place the pivot pin on the right end of slot 9.
Although 7 engages, the loss stroke S2 of the center point R of the addendum radius associated with this slide is small, so that the pedal body 4 only produces a small loss angle Θ PED, and the feeling of operation becomes good. At this time, the toggle spring 12 comes to act in the direction of disengaging the ratchet pole 8, and when the pedal body 4 is stepped on again, the mesh is disengaged and the ratchet pole 8 is rotated by the force of the toggle spring 12. When the foot is removed from the pedal body 4 as it is, the pedal body 4 returns to the original position, that is, the brake release position by the force of the return spring 5.

[0016]

As described above, according to the present invention, the teeth of the ratchet pole are meshed with the ratchet plate of the pedal body of the foot brake pedal, the ratchet pole is supported by the pivot pin through the elongated hole, and the ratchet pole is turned by the toggle spring. In a braking device that performs a brake operation and a brake release operation by sliding the ratchet pole by force and the stepping force of the pedal body, the moment of rotational movement of the ratchet pole in the region of the pedal shaft of the pedal body on the ratchet pole side. Since the center is located, the loss stroke when stopping the depression is greatly reduced and the feeling of operation is improved, and the loss stroke can be reduced without using special parts, so there is no increase in manufacturing cost and toggle The moving distance LS of the spring action point is the moving distance S1 of the long hole
Since the movement is more expanded, the slide toggle mechanism can be operated stably even if S1 is formed shorter than the conventional one, and there is an effect that manufacturability and vibration resistance are improved. The object of the present invention can be accurately achieved by adopting the configurations of a few.

[Brief description of drawings]

FIG. 1 is a side view of a main part of a conventional foot-operated parking brake device.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a side view of an essential part showing an embodiment of the present invention.

FIG. 4 is a partially enlarged view of FIG.

5 is a detailed view of the ratchet plate of FIG.

[Explanation of symbols]

1 foot pedal parking brake device, 3 support shafts, 4 pedal body, 5 return spring, 6 ratchet plate, 7 pivot pin, 8 ratchet pole, 9 oblong hole, 10/11 spring hole, 12 toggle spring, 14 working point, ΘPS rotation Center of instantaneous radius of movement, radius of tooth tip of R ratchet pole

Claims (3)

[Claims] [Claim 1] A ratchet plate is attached to a pedal body of a foot brake pedal which is swingably supported by a support shaft, teeth of a ratchet pole rotatably attached to a pivot pin are meshed with the ratchet plate, and the pivot pin is The shaft hole of the ratchet pole to be inserted is formed in an elongated hole, and a toggle spring for giving a turning force to the ratchet pole is provided, and the ratchet pole is slid along the elongated hole by the turning force and the stepping force of the pedal body. In the brake device of the type which enables the brake operation and the brake release operation to the pedal body, the instantaneous center of rotational movement of the ratchet pole is located in the region of the support shaft on the ratchet pole side. Foot pedal parking brake device. 2. A vertical bisector of the longitudinal axis of the slot is set so as to intersect with a line connecting the spindle and the center point of the tip radius of the ratchet pole, so that The foot parking brake device according to claim 1, wherein the center of rotational movement is located. 3. The vertical bisector of the longitudinal axis of the slot and the vertical bisector at the position where the ratchet pole completes the meshing with the ratchet plate, and the vertical bisector is the pedal body side of the slot. The angle formed by the line that connects the center point of the addendum radius with the intersection point that intersects the inner wall surface of the ratchet pole is set to the slidable angle of the ratchet pole overcoming the friction resistance between the inner wall surface of the slot and the pivot pin. The foot-operated parking brake device according to claim 1 or 2, wherein