JP2546778Y2 - Ratchet plate for foot-operated parking brake system - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ratchet plate in a foot-operated parking brake device.

[0002]

2. Description of the Related Art As a parking device in a vehicle equipped with an automatic transmission, a brake arm is arranged near the floor,
A parking brake device of a type that generates a braking force by stepping on it is widely used. This foot-operated parking brake device is available in
As shown in Japanese Patent Publication No. 1163, for example, a brake arm having a pedal is pivotally supported on a bracket, and a control cable connected to a parking brake device is connected to a tip corner of the brake arm, while an anti-control cable is connected. Side is urged to the return side by a return spring. A ratchet plate having ratchet teeth is fixed to the distal end region of the brake arm by caulking or the like, while a ratchet pole is arranged near the ratchet plate, and a lock claw provided on the ratchet pole is engaged with the ratchet teeth. At the same time, the lock pawl is urged in the meshing direction by a lock spring connected to the lever part of the ratchet pole.

[0003]

[Problems to be Solved by the Invention] However, conventionally, the ratchet plate has been constituted by one thick plate. That is, in detail, if punching is performed to the tooth portion at once by punching, the sagging of the teeth increases, the effective tooth width at the time of meshing decreases, and the wear life is greatly affected. Shape, then
Ratchet teeth were finished by secondary processing such as shaving and machining. For this reason, there has been a problem that the cost is increased in combination with the need for a large-capacity press machine. Further, since the thickness of the ratchet plate is large, it is necessary to increase the width from the periphery of the caulking pin hole to the outer shape, which necessitates an increase in size. Further, the ratchet teeth are always in contact with the lock pawls of the ratchet pole, and the lock pawls move over the ratchet teeth when the brake is operated. For this reason, grease is applied to the ratchet teeth. However, the prior art has a problem that the lubricating film is thinned in a relatively short time due to the above-described structure, and the ratchet teeth are rapidly worn. The present invention was devised in order to solve the above-mentioned problems, and an object of the present invention is to provide a small-sized ratchet plate for a foot-operated parking brake device which has good wear resistance and can reduce costs. Is to provide.

[0004]

According to the present invention, in order to achieve the above object, the present invention is characterized in that a brake arm is provided near a floor of an automobile and is fixed to a distal end region of a brake arm which is locked by generating a braking force.
In a ratchet plate having a ratchet tooth row to be engaged with a ratchet pole, the ratchet plate is constituted by a laminate of a plurality of punched plate pieces. The punched plate piece may be in direct contact with the divided surfaces, or a vibration damping layer may be interposed between the divided surfaces. With this configuration, it is possible to reduce noise generated while the lock claw moves over the ratchet teeth when the brake arm is depressed.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an outline of a foot-operated parking brake device equipped with a ratchet plate according to the present invention, wherein 2 is a bracket fixed to a vehicle body, and 3 is a brake arm provided with a pedal 3a at a lower end near the floor. ,
The brake arm 3 extends into the bracket and has a pivot 12
Pivotally supported by the return spring 11
It is urged to the return side by. An end of a control cable 15 connected to a parking brake device (not shown) is connected to a tip corner of the brake arm 3. Reference numeral 1 denotes a ratchet plate having a ratchet tooth row 10, which is fixed to one surface of the distal end region of the brake arm 3 by caulking pins 16, 16. Reference numeral 4 denotes a ratchet pole, which is rotatably supported by a pivot 18 provided on the bracket 2, has a lock claw 40 at the tip for engaging with the ratchet teeth 10, and a lock supported by the bracket 2 on a lever portion. The spring 13 is attached, and the lock claw 40 is urged in the meshing direction by the spring force of the lock spring 13. Reference numeral 5 denotes a release lever, one end of which is pivotally supported by a pivot 19, and the other end of which is connected to a release cable 7a connected to a release knob 7. The release lever 5 is urged in the direction opposite to the release cable by a holding spring 14 attached to the bracket 2, so that the release piece 5 b contacts or approaches the lever portion of the ratchet pawl 4.

The ratchet plate 1 is not formed of a conventional thick plate, but has a laminated structure of two or more thin punching plates 1a and 1b whose dividing line is a horizontal plane having a thickness. 2 and 3 show a first embodiment of such a ratchet plate 1. FIG. In this embodiment, the number of the punching plates 1a and 1b is two, each having the same contour shape, having ratchet teeth 10a and 10b at the tip, and caulking holes 100 and 10 in at least two places.
0 is penetrated. Each punching plate 1a, 1b
The recess 101 is formed on one side by half-piercing with a punch or the like at a position different from the caulking holes 100, 100,
Two or more sets of protrusions 102 are formed on one side, respectively. The punching plates 1a, 1b are in surface contact with each other, and the projections 102 of one punching plate 1a are fitted into the recesses 101 of the other punching plate 1b, so that the aligned ratchet teeth 10a, 10b are integrated. It is a ratchet plate 1. The brake arm 3 is provided with a through hole 31 separately from the caulking hole.
2 is fitted. That is, the projection 102 also functions as a positioning element at the time of assembly with the brake arm 3, whereby the ratchet teeth 10 a and 10 b
It is possible to accurately set the protruding length from the brake arm end face. FIG. 9 shows the second ratchet plate 1
An example is shown. In this embodiment, a hole 100 for caulking is provided at a central portion of each of the punching plates 1a and 1b, and the punching plates 1a and 1b are fixed to the brake arm by caulking pins. Then, on both sides of the hole 100 for swaging,
As in the first embodiment, two or more combinations of the recesses 101 and the projections 102 are formed, and the projections 102 and the recesses 10 of the respective sets are formed.
1 and the projection of the punching plate 1b is fitted into the through hole of the brake arm for positioning.

FIG. 4 shows a third embodiment of the ratchet plate 1. In this embodiment, one or more punching plates 1a are formed with a recess 101 on one surface and two or more sets of projections 102 on one surface, and the other punching plate 1b is formed with through holes 103 at corresponding positions. . And
The projections 102 are fitted into the through holes 103 by superimposing the punching plate 1a and the punching plate 1b. If necessary, a projection may be provided on the brake arm 3 and fitted into the through hole 103.

FIG. 5 shows a fourth embodiment of the ratchet plate 1. In this embodiment, a vibration damping layer 8 is interposed between the overlapping surfaces of the punched plates 1a and 1b. FIG. 6 shows a fifth embodiment of the ratchet plate 1, in which a vibration damping layer 8 is interposed between the overlapping surfaces of the laminated punching plates 1a and 1b, and between the punching plate 1b and the surface of the brake arm. Also has a vibration damping layer 8 interposed. In some cases, the vibration damping layer 8 may be interposed only between the punching plate 1b and the surface of the brake arm. As the vibration damping layer 8, a sheet made of rubber, synthetic resin, metal, or the like is generally used. in this case,
The vibration damping sheet 8 has a position corresponding to the caulking hole and the projection 1.
02 has a through hole at a position corresponding to 02,
It has a tooth row corresponding to the ratchet tooth row.

The punching plates 1a and 1b may be laminated such that the side having the corner drooping surface 104 is opposed to the adjacent barbed surface side as shown in FIG. 7, or as shown in FIG. The layers may be laminated so that they overlap with each other. In each case, a continuous groove-shaped grease reservoir 6 is formed on the ratchet teeth 10a and 10b by the drooping surface 104. In the third to fifth embodiments, the number of through holes for caulking may be two or more as in the first embodiment, or may be one as in the second embodiment.

[0010]

Next, the operation of the embodiment will be described. The ratchet plate 1 of the present invention is fixed to the brake arm 3 as shown in FIG.
The lock pawl 40 of the ratchet pole 4 meshes with each of the ratchet teeth 10a and 10b. When the pedal 3a is depressed from the state shown in FIG. 1, the brake arm 3 rotates clockwise about the pivot shaft 12, and the control cable 15 is pulled. When the brake arm 3 rotates, the ratchet plate 1 moves integrally, and the ratchet pawl 4 is driven by the urging force of the lock spring 13 so that the ratchet teeth 1
It moves over while contacting 0a and 10b. Pedal 3a
Is released, the lock pawl 40 is pushed by the urging force of the lock spring 13 so that the ratchet teeth 10
The engagement is locked at a and 10b, and the braking force is maintained. When releasing the parking brake, pulling the release knob 7 causes the release lever 5 to rotate counterclockwise, and the release piece 5b presses the lever portion of the ratchet pawl 4, so that the ratchet pawl 4 pivots around the pivot 18 as a fulcrum. Rotating clockwise, the lock pawl 40 and the ratchet teeth 1
The engagement with 0a and 10b is released. Thereby,
The brake arm 3 returns by the spring force of the return spring 11 and the tension of the control cable 15, and the brake state is released.

In the present invention, the ratchet plate 1
Is composed of a laminated body of a plurality of punching plates 1a and 1b, and a projection 102 of one punching plate 1a is formed by a concave portion 101 or a through hole 10 of the other punching plate 1b.
Since the positioning is carried out by fitting to 3, good integration can be obtained. In addition, the grease reservoir 6 is formed by the sagging surface 104 between the ratchet teeth 10a and 10b of each of the punching plates 1a and 1b. For this reason, the grease applied to the ratchet teeth 10a and 10b stays for a long time, and the ratchet teeth 10a and 10b are less likely to be worn even if the grease is relatively slid while always in contact with the lock claws 40. Further, when the vibration damping layer 8 is interposed on the dividing surface as in the third and fourth embodiments, each time the lock claw 40 falls into the groove of the ratchet tooth row at the time of the brake operation, the lock claw 40 becomes the ratchet tooth row. The impact energy generated each time it hits the tooth back is absorbed by the vibration damping layer 8 and the propagation to the brake arm 3 is suppressed, so that noise is reduced.

[0012]

According to the first aspect of the present invention described above, since the ratchet plate 1 is composed of a laminate of a plurality of punching plates 1a and 1b, the punching thickness of the material can be greatly reduced. Can be. For this reason, the sagging amount is small, the effective tooth thickness can be ensured even when the required number of sheets are matched, and the width can be reduced, so that downsizing can be achieved. In addition, finishing can be performed all at once by precision punching including ratchet teeth, and secondary processing such as shaving and machining can be omitted, and cost can be reduced. Furthermore, since at least one of the mating surfaces of the stacked punching plates 1a and 1b has a drooping surface, a grease reservoir can be formed along the ratchet teeth row by this dripping surface, and the abrasion resistance of the ratchet teeth is improved. be able to. According to the second aspect, in addition to the above features, an excellent effect that noise at the time of operating the brake arm can be reduced can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a foot-operated parking brake device using a ratchet plate according to the present invention.

FIG. 2 is a perspective view showing the first embodiment of the ratchet plate according to the present invention;

FIG. 3 is a cross-sectional view taken along line XX of FIG.

FIG. 4 is a sectional view showing a third embodiment of the present invention.

FIG. 5 is a sectional view showing a fourth embodiment of the present invention.

FIG. 6 is a sectional view showing a fifth embodiment of the present invention.

FIG. 7 is a partially enlarged view of the ratchet plate according to the present invention.

FIG. 8 is a partially enlarged view of the ratchet plate according to the present invention.

FIG. 9 is a perspective view showing a second embodiment of the present invention.

[Description of Signs] 1 Ratchet plate 1a, 1b Punching plate 3 Brake arm 4 Ratchet pole 10a, 10b Ratchet teeth

Claims (2)

(57) [Scope of request for utility model registration] 1. A ratchet plate provided near a floor of an automobile and having a ratchet tooth array fixed to a tip end region of a brake arm which is locked by generating a braking force and engaging with a ratchet pole. A ratchet plate for a foot-operated parking brake device, comprising a laminate of a plurality of punched plates. 2. A ratchet plate for a foot-operated parking brake device according to claim 1, including a plate in which a vibration damping layer is interposed on a dividing surface of the punching plate.