JP3772387B2 - Parking brake device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a parking brake device mounted on, for example, an automobile, and more particularly to a parking brake having an automatic cable adjustment mechanism.
[0002]
[Prior art]
As disclosed in Japanese Patent Application Laid-Open No. 8-11687, a conventional parking brake device is configured to pull a cable having one end connected to a brake lever and the other end connected to a braking portion by rotating the brake lever. In the parking brake device, the braking action at the braking portion is released by returning the brake lever to the original position, and the brake lever is connected to one end of the cable. The plate to be connected to the plate is relatively rotatably assembled, and the plate is engaged with a tooth portion provided on the plate so that the plate can be rotated only in the direction of pulling the cable with respect to the brake lever. As a result, the brake lever is rotated in a direction to return the brake lever to its original position by the first urging member. Is energized, the plate has a parking brake device is known which is characterized in that it has to be rotationally biased in a direction to pull the cable to the brake lever by the second biasing member.
[0003]
In this conventional parking brake device, when the brake lever is rotated against the urging force of the first urging member to obtain a braking action from the original position, the claw portion of the brake lever is engaged with the tooth portion of the plate. As a result, the plate also rotates integrally with the rotation of the brake lever, and the cable is pulled by the rotation of the plate, so that a braking action is obtained at the braking portion.
[0004]
When the depression of the brake lever is released, the brake lever is returned to the original position by the urging force of the first urging member and the return action of the braking unit.
[0005]
As an operation of the automatic adjusting mechanism, the plate is urged to rotate with respect to the brake lever in the original position while shifting the engagement position of the tooth portion and the claw portion in the direction of pulling the cable by the second urging member. When the cable is pulled by the urging force of the second urging member, the tension is automatically adjusted in a stepwise manner according to the engagement position of the claw portion with the tooth portion. That is, in general, the parking brake extends the cable by operating the parking brake, and the operability also changes because the operation stroke of the parking brake lever changes as it is, and the braking force becomes unstable, Although an operation failure occurs, the operation stroke of the parking brake lever can be made almost constant by the automatic adjustment mechanism even if the cable is stretched, and the brake braking force can be stabilized.
[0006]
[Problems to be solved by the invention]
However, the above-described conventional parking brake device includes a first urging member for returning the brake lever to the initial position and a second urging member for the automatic adjustment mechanism that urges the plate in the direction of pulling the cable. Therefore, the work efficiency in the assembly process is reduced due to an increase in the number of parts, and the cost is increased.
[0007]
It is a technical object of the present invention to provide a parking brake device that can improve work efficiency and reduce costs by adopting a simple configuration.
[0008]
[Means for Solving the Problems]
In order to solve the above technical problem, a brake lever that is rotatably attached to a support shaft and is stepped on, and a brake lever that is rotatably attached to the brake lever. A cam plate and a cable having one end connected to the cam plate and the other end connected to a braking portion are provided, and the cable is pulled by rotation of the brake lever to obtain a braking action in the braking portion. In addition, the parking brake device is configured such that the braking action of the braking portion is released by returning the brake lever to its original position, wherein the cam plate is moved against the brake lever by an urging member. The cable is pulled in the direction of pulling the cable, and the brake lever is moved back to the original position by the biasing member. In the parking brake device having a disassembling means for disassembling the urging direction of the urging member so as to be urged to rotate in a direction to return to the position, the disassembling means is a rotation function provided to the cam plate. A cam portion; a cam hole provided in the brake lever; and a cam follower that is movably assembled to the cam hole. The cam follower is urged toward the cam plate by the urging member. the causes the cam follower engaged Tamabachi to engage the pivot function the cam portion of the cam plate, by Tamabachi to engage with the brake lever in the cam hole, the cam plate is the biasing member Te And the brake lever is urged to rotate in the direction of pulling the cable with respect to the brake lever. It has to be rotationally biased in a direction to return to the position to constitute a parking brake device according to claim.
[0012]
In the parking brake device according to claim 1, when the depression of the brake lever is released , the brake lever is biased by the biasing member via the cam follower that is elastically engaged with the brake lever in the cam hole by the biasing member. It is returned to its original position by the urging force.
[0013]
As an operation of the automatic adjustment mechanism , the cam plate is connected to the cable by the urging member via the cam follower which is elastically engaged with the rotation function cam portion by the urging member with respect to the brake lever in the original position. The cable is pulled by the urging force of the urging member, and the tension is automatically adjusted.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be specifically described with reference to embodiments.
[0019]
(Embodiment)
FIG. 1 shows an example in which a parking brake device according to the present invention is implemented in a foot-operated parking brake device 10, and FIG. 2 shows a state where the parking brake device 10 of FIG. 1 is depressed. 3 is a view showing a state where the parking brake device 10 of FIG. 1 is fully depressed , and FIG. 4 is a view showing an operating state of the automatic adjustment mechanism of the parking brake device 10 of FIG. It is. In the parking brake device 10, a cam plate 12 is assembled on one side of a brake lever (pedal) 11 that is stepped on. The cam plate 12 has a rotation function cam portion (inclined cam surface) 12 a and is rotatably mounted on a support shaft 13 that pivotally supports the brake lever 11. optionally mounted so as to be rotatable with respect to, so the rotation of the support bracket 19 which is fixed to the vehicle body to the contact by the counterclockwise direction between the stopper 19a formed integrally is restricted Yes. One end of a cable 14 is connected to the cam plate 12 via a connection bracket 15 and a connection pin 16, and a cam follower (roller) 17 is engaged with the cam plate 12. Note that the other end of the cable 14 is connected to the braking unit 30 as is well known, and the cable 14 is pulled when the brake lever 11 is rotated in the clockwise direction in the drawing, so that the braking operation is obtained by the braking unit 30. It is supposed to be.
[0020]
The cam follower 17 is movably provided in a cam long hole 11 a provided in the brake lever 11, and is engaged with the brake lever 11 by the urging force of a spring 18 toward the cam plate 12 along the cam long hole 11 a. It is moved and elastically engaged with the turning function cam portion 12a, and is urged to turn in the direction in which the brake lever 11 returns to the original position by the spring 18 via the cam follower 17 (counterclockwise in the figure). In addition, the cam plate 12 is urged to rotate in the direction of pulling the cable 14 (clockwise in the figure) with respect to the brake lever 11 by the spring 18 via the cam follower 17.
[0021]
That is, the urging direction of the spring 18 is divided into a direction in which the cable 14 is pulled with respect to the cam plate 12 with respect to the brake lever 11 (clockwise in the figure) and a direction in which the brake lever 11 is returned to the original position (counterclockwise in the figure). The disassembling means for disassembling is composed of a cam follower 17, a cam long hole 11a, and a rotating function cam portion 12a. 1 is extended in the direction connecting the pedal portion 11b of the brake lever 11, and the rotation function cam portion 12a is lowered to the left in the extending direction toward the support shaft 13 of the cam long hole 11a in FIG. It has an inclined surface, and the cam long hole 11a, the inclination direction and inclination angle of the rotation function cam portion 12a, and the spring 18 are further adjusted so that the brake lever 11 is rotated to the original position. As the cam plate 12 is rotated in a direction to pull the cable 14, are respectively set and arranged.
[0022]
Further, in the parking brake device 10 of the present embodiment, a fan-shaped ratchet 21 is fixed to the brake lever 11, an air cylinder 22 is interposed between the brake lever 11 and the support bracket 19, and a pole is attached to the support bracket 19. 23 and a release lever 24 are assembled so as to be rotatable about pins 23 and 24 as support shafts, respectively. The pole 23 is urged clockwise by a spring 25, and can be engaged with and disengaged from the ratchet 21 by an engagement end 23b. The release lever 24 rotates the pole 23 counterclockwise in the figure via an engagement end 24a that engages with the pole 23, and is biased in the clockwise direction in the figure by a spring 26. It is connected to a release knob (both not shown) via a release cable, and the release lever 24 is rotated counterclockwise by pulling the release knob. The support bracket 19 is provided with a rubber stopper 27 that defines a return position (original position) of the brake lever 11, and a switch 28 is built in the rubber stopper 27.
[0023]
In the present embodiment configured as described above, when the brake lever 11 is stepped on as shown in FIGS. 1 to 4, the brake lever 11 causes the engagement end portion 23 b of the pole 23 to reach the ratchet 21. When the cam follower 17 is rotated in the illustrated clockwise direction against the biasing force of the spring 18 while being pushed up counterclockwise by the teeth, the cam follower 17 is moved substantially integrally with the brake lever 11 to thereby move the cam plate 12. The cam plate 12 is pushed through the cam follower 17 so that the cam plate 12 is rotated together with the brake lever 11 in the clockwise direction in the drawing so that the cable 14 is pulled. It is done.
[0024]
As shown in FIG. 3, when the brake lever 11 is depressed to the maximum and the depression of the brake lever 11 is released, the pole 23 is rotated clockwise by the spring 25 to engage the ratchet 21 and the pole 23. Even if the end portion 23b is engaged and the depression of the brake lever 11 is released, the brake lever 11 is held in the depressed state, and the braking action at the braking unit 30 is maintained.
[0025]
Such a state (parking brake operating state) can be released by pulling the release knob and turning the release lever 24 counterclockwise in the figure. At this time, the pawl 23 is engaged by the engagement end 24a of the release lever 24. Is rotated counterclockwise in the drawing to disengage the engaging end 23b of the pole 23 from the ratchet 21, and the brake lever 11 is elastically repelled by the spring 18 in the cam long hole 11a. Is returned to its original position by the urging force of the spring 18 and the return action of the braking unit 30 through the cam follower 17 engaged with the brake follower 11, that is, the brake lever 11, the cable 14, etc. And it will return to the original position shown in FIG. 1 by the reset action of the air cylinder 22 or the brake part 30.
[0026]
As shown in FIG. 4, the automatic adjustment mechanism is actuated via a cam follower 17 that is elastically engaged with the turning function cam portion 12a by a spring 18 with respect to the brake lever 11 in the original position. Thus, the cam plate 12 is urged to rotate in the direction of pulling the cable 14 by the spring 18, that is, the cam follower 17 pushes the rotation function cam portion 12a of the cam plate 12, and the cam plate 12 is rotated clockwise in the figure. The cable 14 is pulled by the spring force of the spring 18 so that the tension is automatically adjusted steplessly.
[0027]
As described above, according to the parking brake device 10 of the present embodiment, the spring 18 performs the urging of the brake lever 11 to the original position and the urging for the automatic adjustment of the cable 14. Therefore, there is no need to install a spring for returning the brake lever to its original position and for automatic adjustment of the cable. Therefore, the number of parts can be reduced, and the assembly work can be reduced during the assembly process of the parking brake device. It is possible to provide a parking brake device that can be simplified and cost can be reduced.
[0028]
Further, according to the parking brake device 10 of the present embodiment, the cam elongated hole 11a, the rotation function cam portion 12a and the cam follower 17 constituting the disassembling means brake the biasing direction of the spring 18 and brake the cam plate 12. Disassembling the cable 14 with respect to the lever 11 (clockwise in the figure) and returning the brake lever 11 to the original position (counterclockwise in the figure), and urging the brake lever 11 to the original position; The urging for automatic adjustment of the cable 14 can be performed by the spring 18.
[0029]
Further, according to the parking brake device 10 of the present embodiment, since the engagement between the brake lever 11 and the cam plate 12 is performed via the cam follower 17, the cam follower 17 is related to the brake lever 11 and the spring 18. The engaging member is an engaging member between the cam plate 12 and the spring 18 and is also an engaging member between the brake lever 11 and the cam plate 12. Therefore, the engaging member between the brake lever 11 and the cam plate 12 is No other need.
[0030]
Further, according to the parking brake device 10 of the present embodiment, since the automatic adjustment mechanism is a stepless automatic adjustment mechanism, it is possible to reliably cope with the minute extension of the cable 14. .
[0031]
In the present embodiment, the cam follower 17 and the spring 18 are separate members. However, the present invention is not particularly limited to this configuration. For example, in the parking brake device of the present invention in which the spring and the cam follower are integrally formed. Similar effects can be obtained.
[0032]
Moreover, in this Embodiment, although the cam follower 17 is exhibiting the roller shape, it cannot be overemphasized that it is not limited in particular to this shape.
[0033]
The above embodiment is an example in which the parking brake device according to the present invention is implemented in a stepping type parking brake device, but the parking brake device according to the present invention can be similarly implemented in a manual parking brake device.
[0034]
As mentioned above, although this invention was demonstrated according to the said embodiment, this invention is not limited only to the said aspect, The various aspect according to the principle of this invention is included.
[0035]
【The invention's effect】
As described above, according to the first aspect of the present invention, the urging of the brake lever to the original position and the urging for automatic adjustment of the cable are performed by one urging member. Therefore, it is possible to reduce the number of parts and reduce the number of parts during the assembly process of the parking brake device. It is possible to provide a parking brake device that can simplify the attaching work, improve the work efficiency, and reduce the cost.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a parking brake device according to an embodiment.
2 is a cross-sectional view showing a state where the parking brake device of FIG. 1 is depressed. FIG.
3 is a cross-sectional view showing a state where the parking brake device of FIG. 1 is fully depressed.
4 is a cross-sectional view of the parking brake device of FIG. 1 in an operating state of an automatic adjustment mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Parking brake apparatus 11 Brake lever 11a Cam long hole 12 Cam plate 12a Rotation function cam part 14 Cable 17 Cam follower 18 Spring 30 Brake part

Claims (1)

A brake lever that is pivotally assembled to the support shaft and is stepped on, a cam plate that is pivotally mounted relative to the brake lever, and one end of the cam plate And a cable connected to the braking portion at the other end, and pulling the cable by the rotation of the brake lever to obtain a braking action at the braking portion. A parking brake device in which the braking action at the braking portion is released by returning to the position, wherein the cam plate is biased to rotate in a direction of pulling the cable with respect to the brake lever by a biasing member. At the same time, the brake lever is urged to rotate by the urging member in a direction to return the brake lever to its original position. In addition, in the parking brake device having a disassembling means for disassembling the urging direction of the urging member, the disassembling means includes a turning function cam portion provided on the cam plate, and a cam provided on the brake lever. And a cam follower that is movably assembled to the cam hole. The cam follower is urged toward the cam plate by the urging member and the cam follower is rotated by the cam plate. A direction in which the cam plate pulls the cable with respect to the brake lever by the biasing member by engaging the brake lever elastically with the brake lever in the cam hole. And the brake lever is urged to rotate in a direction to return the brake lever to its original position by the urging member. Parking brake system, characterized in that had Unishi.

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