JPH03284455A - Foot-operated parking brake device - Google Patents

Abstract

PURPOSE:To provide a compact structure and make release operation easy by driving a release mechanism which performs release action of a locking mechanism through a motor which works on the operation of a command switch. CONSTITUTION:When a pedal 20B is depressed, a pedal member 20 is rotated around a shaft 15 to pull a brake cable 25. When the pedal is depressed to a prescribed degree, the pedal member 20 attempts to return to an original position by the force of a return spring 81, and a brake drum 32 attempts to rotate counter-clockwise, however, its rotation is stopped by friction tightening of a brake spring 33 to obtain a parking brake condition. When releasing the parking brake, a motor 52 is rotated by depressing a command switch 100, so that a release lever 51 is rotated against a return spring 56 through a gear mechanism 53 and a tooth part 51D. Then the edge part 33B of the brake spring 33 is rotated in a release direction by the arc-shaped part 51B of the lever 51 to release the restraint of the brake drum 32.

Description

Detailed Description of the Invention] Industrial Application Field 1 The present invention relates to a foot-operated parking brake device used in automobiles and the like.

[Prior art 1] In general, a foot-operated parking brake device operates by depressing a pedal to perform a braking operation via a brake cable, and by holding the pedal in the depressed position with a locking mechanism, the parking brake state is adjusted. I try to maintain it.

As a release device for releasing this brake state, there are a manual type that releases by pulling a release cable wired inside the vehicle interior, and a vacuum type that uses the negative pressure of the engine. .

[Problem to be solved by the invention 1 However, in such a conventional release device,
In the case of a manual type, it is a complicated mechanism, requires a large installation space, and has restrictions on wiring, which may reduce transmission efficiency or force the release operation to be performed in an awkward position. There was a problem.

In addition, in the case of a vacuum type, the release operation may have to be performed even when the engine is stopped, and an accumulator, etc. for sound pressure is required, which poses problems in terms of onboard space. Ta.

SUMMARY OF THE INVENTION An object of the present invention is to provide a foot-operated parking brake device that solves these conventional problems, has a compact structure, and can be easily released.

[Means for Solving the Problems 1] In order to achieve the above object, the present invention includes a base member fixed at a predetermined position of a vehicle body, a base member rotatably supported by the base member, and a brake cable connected to an end thereof. A pedal member having a mating portion and a toothed portion, a locking mechanism that engages with the toothed portion and prevents the pedal from rotating in the return direction at a depressed position, and a command provided at a predetermined position in a vehicle interior. It is characterized by comprising a switch and a release mechanism that is driven by a motor that responds to the operation of the command switch and performs a release operation of the lock mechanism.

[Function 1] According to the present invention, when the pedal is depressed, the parking brake is operated via the cable engaged with the brake cable engagement portion, and the pedal member is prevented from rotating in the return direction by the lock mechanism. , is held in that position.

When performing a release operation, a command switch provided at a predetermined position in the vehicle interior is operated, and the motor rotates to drive the release mechanism. As a result, the locking mechanism is unlocked, the pedal is rotated in the return direction, and the pedal is released.

[Embodiment J] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

An embodiment of the present invention is shown in FIGS. 1 to 10.

In the figure, reference numeral 10 denotes a base member formed in the shape of a box with one side open, and is fixed to a predetermined position such as a dash board of a vehicle body via mounting brackets 11 and 12 fixed to the side surfaces. An emboss is formed on the bottom wall 10A of the base member 10 to improve strength, and an insertion hole 10B for a motor, which will be described later, is formed, and one ends of shafts 13, 14 and 15 are fixed by caulking, and a shaft 16 is inserted through the bottom wall 10A. It is fixed. Further, a rear wall 10C (based on the front of the vehicle) of the base member 1O is provided with a notch hole 100 for holding an emergency release cable and a spring locking hole 10E, which will be described later. And the bottom wall 10A
A hook member 17 for locking the end of a return spring, which will be described later, is provided on the outside of the spring.

20 is a hole 20A in the shaft 13 fixed to the base member 10.
This is a pedal member rotatably supported, and a bracket 21 for locking a brake cable 25 (see FIG. 4), an L half piece 22 for switch operation, and a sector gear 23 are fixed to the end opposite to the pedal 20B. has been done. Also,
A rod 24 for locking a damper and a return spring, which will be described later, is fixed near the pedal 20B.

A locking mechanism 30 includes a gear 31 that meshes with the sector gear 23 and a brake drum 3 that rotates integrally with the gear 31.
2.8 and a brake spring 33 wound around a brake drum 32. Thus, the gear 31 and the brake drum 32 are rotatably supported on the shaft 14 fixed to the base member 10 described above. As shown in FIG. 9, the brake spring 33 has one end 33A.
is held between a bracket 34 fixed to the base member 1O and a lock plate 36 fastened to the bracket 34 with screws 35, and the other end 33B can come into contact with a release lever to be described later. Note that the winding direction of the brake spring 33 is a direction in which the tightening force on the brake drum 32 is loosened with respect to the rotation direction of the brake drum 32 accompanying the depression operation of the pedal member 20.

40 is a resin intermediate body, which is connected to the base member 1 described above.
Insertion holes 40A, 40B and 40C are formed through which shafts 14 and 15 fixed to the shafts 15 and a motor described below are inserted, and stems 40D, 40E, 40E and 40F are formed on the bottom wall of the holes for receiving each member described below. , 4
0F is integrally formed.

50 is a release mechanism, which includes the above-mentioned release lever 51, motor 52, transmission gear mechanism 53, and switch mechanism 5.
4 as its main constituent elements.

The release lever 51 is formed with a hole 51A through which the tip of the shaft 14, which pivotally supports the gear 31 and the brake drum 32 together with the insertion hole 40A of the intermediate body 40, is inserted through a collar 55. An arcuate portion 51B that can come into contact with one end 33B of the brake spring 33 and an end of the emergency release cable described above are locked on one end side of the release lever 51 with this hole 51A as the center. a locking notch 51G, and a locking hole 51C in which the other end of the return spring 56, one end of which is locked in the spring locking hole 10D of the base member IO described above, is locked.
are formed, and a tooth portion 510 and a tongue piece 51E are formed on the other end side.

Further, on the other end side of the release lever 51, a cam member 57 having a circular arc surface 57A centered on the axis of the hole 51A is fixed. Two cam ridges 57B and 57C (see FIG. 4) are provided so as to protrude in a staggered manner in the axial direction.

Two limit switches 58 and 59 are provided corresponding to the cam ridges 57B and 57G, and both limit switches 58 and 59 are connected to the stem 40E formed on the intermediate body 40 described above.

40E and is supported.

The cam member 57 and limit switches 58 and 59 constitute the above-mentioned switch mechanism 54.

Next, the motor 52 is fixed to a motor bracket 52A, and the motor bracket 52A connects the motor 52 to the insertion hole 40G of the intermediate body 40 and the insertion hole 10B of the base member 10.
With the stem inserted through the stem 40F and the 4th leaf, it is fixed with screws.

A binion 53A is fixed to the output shaft of the motor 52, and this binion 53A is meshed with a large diameter gear 53B. In addition, the large diameter gear 53B is the release lever 51 mentioned above.
The support shaft 53D is integrally formed with a small diameter gear 53C (see FIG. 4) that meshes with a tooth portion 510 formed in a support shaft 53D, and one end of the support shaft 53D is connected to the aforementioned intermediate body 40.
It is rotatably supported by a stem 400 of. Thus, the transmission gear mechanism 53 is composed of the pinion 53A, the large diameter gear 53B, the support shaft 53D, and the small diameter gear 53G, and the rotational axes of these, including the rotational axes of the motor 52 and the release lever 51, are all parallel. It is said that reversible transmission is possible.

60 is a cover member that covers the open surface of the base member 10, and holes 60A, 60B, which respectively support the other ends of the shafts 13, 14, 15 and 16 fixed to the bottom wall 10A of the base member 10. 60C and 600 are drilled. The shaft ends of the shafts 13, 14, 15 and 16 are inserted into the holes 60A, 60B, 60G and 60D, respectively, and then fixed to the cover member 60 by caulking.

Furthermore, 60E is a bearing hole, which rotatably supports the other end of the aforementioned support shaft 53D. Further, 60F is an arcuate slit, which is the tongue piece 5 formed on the release lever 51 described above.
1E is inserted and engaged to regulate the amount of rotation of the release lever 5I. In addition, 61 is a parking brake switch operated by the L half piece 22 fixed to the pedal member 20.

A board 70 has a plurality of relays 71 fixed thereon, and is supported on the back surface of the intermediate body 40 described above.

The relay 71 is connected to a ground terminal 72 via a lead wire. Power connector 73. Switch connector 74. Limit switches 58 and 59 and motor 52 are connected, respectively.

Reference numeral 80 denotes a cylindrical bumper member made of an elastic body that is inserted and supported by the aforementioned shaft 16, and serves as a buffer when the pedal member 20 returns.

Reference numeral 81 denotes a return spring, which is stretched between the rod 24 of the pedal member 2° and the hook member 17.

And 82 is an air damper similarly attached to the rod 24 and the shaft 16 extending outside the base member 2o.

The air damper 82 is a cylinder 82A as a component as shown in FIG. 3 and a piston rod 82B integral with the piston are each molded of resin, and a shaft 16 is formed in a mounting hole 82C formed in the cylinder 82A in a direction perpendicular to the axis, and a shaft 16 is also formed in the piston rod 82B in a direction perpendicular to the axis. The rods 24 are inserted through and attached to the attachment holes 82D, respectively.

Further, reference numeral 90 denotes an operating handle used during the emergency, and is connected to an emergency release cable 91 that is locked in the locking notch 51C of the release lever 51 described above.

Also. Reference numeral 100 designates a command switch for commanding the release of the parking brake, which can be installed at any position within the vehicle interior that can be operated by the driver, and is connected to the switch connector 74 via a lead wire.

In this embodiment having the above configuration, when the pedal 20B is depressed, the pedal member 20 rotates around the shaft 13, and the brake cable 25 that is locked to the locking bracket 21 is pulled. Gear 31 meshing with sector gear 23 at this time
The brake drum 32 rotates clockwise as shown in the first figure through the brake drum 32, but since the brake spring 33 is in the loosening direction, it can rotate without any restraining force. When the pedal member 20 is depressed by a predetermined amount, the pedal member 20 tends to return to its original position due to the urging force of the return spring 81, and the brake drum 3
2 tries to rotate counterclockwise, but this rotation is prevented by the frictional tightening of the brake spring 33, so that the pedal member 20 is held in that position and a parking brake condition is obtained.

In this state, the parking brake switch 61 is operated by the L half piece 22, and lamps and the like are turned on.

When releasing the parking brake, press the command switch 100 provided at any position in the vehicle interior, the motor 52 will rotate, and the release lever 51 will be activated via the transmission gear mechanism 53 and the teeth 510. It rotates clockwise in FIG. 1 against the urging force of the return spring 56.

Then, the arcuate portion 51B of the release lever 51 rotates the end portion 33B of the brake spring 33 in the loosening direction, and as a result, the restraining force of the brake drum 32 is released, and the pedal member 20 is moved by the biasing force of the return spring 81. The air damper 82 prevents sudden rotation and returns to the original position. Therefore, the parking brake is released.

Furthermore, when the above-mentioned release lever 51 rotates in the unlocking direction, the limit switch 58 is operated by the cam ridge 57B of the cam member 57 at its terminal end, and the motor 52 starts to reverse rotation. Then, the release lever 51
rotates counterclockwise and returns to its original position, and at the end thereof, the cam ridge 57C operates the limit switch 59 to stop the motor 52.

Note that if a problem occurs in the electrical system such as the motor 52, the parking brake state can be released by pulling the operating handle 90 as an emergency measure. That is, when the operating handle 90 is pulled, the release lever 51 is directly rotated via the emergency release cable 91, the brake spring 33 is loosened, the brake drum 32 is rotated, and the pedal member 2 is rotated.
0 is returned to its original position.

According to this embodiment, the release lever 51 is provided with a switching cam member 57, which starts and stops the motor 52 in reverse rotation, so that accurate motor control can be performed.

Further, since the release mechanism 50 including the lock mechanism 30 and the motor 52 is sub-assembled to the intermediate body 40 made of resin and is disposed between the base member IO and the cover member 60, assembly is easy. In addition, there is no interference with other parts (there is no risk of malfunction etc.).

Next, another embodiment of the present invention is shown in FIG.

This embodiment differs from the previous embodiment in that the locking mechanism is a brake drum 32 and a brake spring 33 wound around the brake drum 32.
In contrast to the previous configuration, which is configured by a combination of ratchet teeth 230 and a bowl 330.

Hereinafter, another embodiment of the present invention will be described based on FIG. 11, which corresponds to FIG. 4 in the previous embodiment, and unless otherwise specified, the same parts as in the previous embodiment are shown. Use the same reference numerals to avoid duplicate explanations.

That is, in this embodiment, an arcuate ratchet tooth 230 is provided at the end of the pedal member 20 in place of the sector gear 23 of the previous embodiment. A bowl 330 that rotates integrally with the release lever 51 is rotatably supported on the shaft 14, and the bowl 330 is urged by a return spring 56 in the direction of meshing with the ratchet teeth 230.

In this embodiment as well, when the pedal member 20 is depressed, the pedal member 20 rotates about the shaft 13 and is held at a predetermined depressed position by the engagement of the ratchet teeth 230 and the bowl 330, thereby obtaining a parking brake state.

At the time of release, when the command switch 100 is pressed as in the previous embodiment, the motor 52 rotates, and the release lever 51 and bowl 330 are moved to the return spring 5 via the transmission gear mechanism 53 and the teeth 51D.
It is rotated clockwise in FIG. 11 against the urging force of 6. Then, the engagement with the ratchet teeth 230 is released, and the pedal member 20 is returned to its original position by the biasing force of the return spring 81.

Further, the motor 52 starts reverse rotation when the limit switch 58 is operated by the cam ridge 57B, and
7C is stopped by operating the limit switch 59.

The release lever 51 and bowl 330 are thus returned to their original positions.

[Effect of the Invention 1] As is clear from the above description, according to the present invention, the release mechanism that performs the release operation of the lock mechanism is driven by a motor that responds to the operation of a command switch provided at a predetermined position in the vehicle interior. As a result, it is possible to obtain a foot-operated parking brake device that is compact and can be easily released.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment of the present invention, Fig. 2 is a perspective view showing an assembled state of the embodiment of the invention, Fig. 3 is a rear view of the embodiment of the invention, Fig. 4 FIG. 2 is a right side view of one embodiment of the present invention, showing a state with a cover member removed. FIG. 5 is a right side view of one embodiment of the present invention, showing a state in which a cover member is attached. FIG. 6 is a left side view of an embodiment of the present invention, FIG. 7 is a sectional view taken along the line A-A in FIG. 6, FIG. 8 is a sectional view taken along the line B-B in FIG. 6, and FIG. 5 is a sectional view taken along the line C-C in FIG. 5, FIG. 10 is a side view showing an example of the air damper, and FIG. 11 is a right side view of another embodiment of the present invention, with the cover member removed. shows. DESCRIPTION OF SYMBOLS 10... Base member, 20... Pedal member, 30... Lock mechanism, 32... Brake drum, 33... Brake spring, 40... Intermediate body, 50... Release mechanism, 51 ...Release lever 52...Motor, 53...Transmission gear mechanism, 54...Switch mechanism, 57...Cam member, 58, 59...Limit switch, 60...Cover member, 80...Bumper 81...Return spring, 82...Air damper Hokanro-Actual fact 1 row 4 friends mountain country Figure 3 (Ki M month-Disasters row non-kei, farm ( (Cover q) (Cover q)
J Saitori 1 size) Figure 5 1ff: vfJ odor example's friend side prisoner Figure 6 Figure 5I! ]') C-C Kyu 3 Mio 1 Kuniku Air Tamper Example Color 7r, 1st side tio country Fig. 10 Fig. 60 A-A Tenpetsu Cod Sankuni Fig. 7 Fig. Hermitage P Month 0 I Ya's actual ratio of 1 row of filod road ■Illusion (to power-
Figure 11

Claims (1)

[Scope of Claims] 1) A base member fixed at a predetermined position on a vehicle body; A pedal member rotatably supported by the base member and having a brake cable engaging portion and a tooth portion at an end thereof; , a locking mechanism that engages with the teeth and prevents the pedal from rotating in the return direction when the pedal is depressed; a command switch provided at a predetermined position in the vehicle interior; and a motor that responds to the operation of the command switch. A foot-operated parking brake device comprising: a release mechanism that is driven by the lock mechanism and performs a release operation of the lock mechanism.