JPH0439149A - Foot-depressed parking brake - Google Patents

Abstract

PURPOSE:To make a device compact by outwardly fitting a lock spring in close contact across a support shaft and a rotor, inwardly fitting a clutch spring in close contact across the rotor and a damper case, and dually fitting both springs to the support shaft inwardly and outwardly. CONSTITUTION:A lock spring 22 is outwardly fitted in close contact across the large-diameter section of a support shaft 3 and a rotor 6, a hook section 22a at one end is hooked on the support shaft 3, and a hook section 22b at the other end is hooked on a lock release ring 23 as a lock releasing member. A clutch spring 27 is inwardly fitted in close contact across a rotor 6 and a damper case 7, and the lock spring 22 and the clutch spring 27 are dually fitted to the support shaft 3. When a brake arm is rotated, the rotor 6 is rotated, the lock spring 22 is expanded in diameter, the clutch spring 27 is shrunk in diameter, and the damper case 7 is integrated with the support shaft 3 via a viscous material. This device can be made compact.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a foot-operated parking brake that operates and releases the parking brake of a vehicle such as an automobile.

[Prior Art] With the installation of automatic transmissions, recent automobiles have adopted foot-operated parking brakes instead of hand-operated parking brakes. FIG. 3 shows a conventional foot-operated parking brake disclosed in Japanese Unexamined Patent Publication No. 63-106161.

In the figure, the structure will be described. A support shaft 3 is fitted into and fixed to a vehicle body frame 20, and a brake arm 4 is rotatably supported on the support shaft 3. The support shaft 3 has a stepped shape whose diameter gradually decreases in the direction away from the vehicle body frame 20 (rightward in FIG. 3), and a brake arm 4 is attached to the large diameter portion on the vehicle body frame 20 side.
A brake arm cylinder 21 that rotates integrally with the brake arm is inserted externally. The brake arm cylinder 21 and the support shaft 3 are closely covered with a coil portion of a lock spring 22 so as to be wrapped around the brake arm cylinder 21 and the support shaft 3. The locks ring 22 is made of a coil spring with a rectangular cross section, and has a hook portion 22a at one end.
is inserted into the support shaft 3, and the hook portion 22b at the other end is inserted into the support shaft 3.
The lock release ring 23 is rotatably inserted into the lock release ring 23. The coil portion of the lock spring 22 expands in diameter when the lock release ring 23 is rotated in the lock release direction.

The rotating drum 15 is externally mounted on the small diameter portion of the support shaft 3 on the opposite side of the vehicle body frame 20. A brake connecting plate 29 extends from the rotating drum 15 in the direction of the brake arm 4, and the brake connecting plate 29 and the brake arm are connected to each other. They are connected by a connecting bin 24. Therefore, when the brake arm 4 is depressed, the rotating drum 15
and rotate in the same direction. A fixed drum 14 facing the rotating tram 15 is provided outside the rotating drum 15. A connecting plate 25 is fitted on one end surface of the fixed drum 14, and the connecting plate 25 is indirectly attached to the supporting shaft 3 by being connected to a fixed drum cylinder 26 fitted onto the supporting shaft 3. .

Comb tooth-shaped fins 18 and 17 extending in the radial direction of the support shaft 3 are respectively attached to the fixed drum 14 and the rotating drum 15, and these fins 18 and 17 are inserted into each other with a predetermined gap, The void is filled with a viscous substance such as viscous grease. Further, the fixed drum cylinder 26 and the support shaft 3 are covered with a clutch sling 27 which is a coil spring having a rectangular cross section and is tightly wrapped around the clutch sling 27 . The clutch spring 27 is wound in the same direction as the lock spring 22 and is tightly covered with the lock spring 22, and the hook portions at both ends are free ends. Note that reference numeral 28 is a presser plate fitted to the tip of the support shaft 3 in order to prevent the fixed drum cylinder 26 and the connecting plate 25 from being removed.

Further, the return spring 5 is provided so as to span between the vehicle body frame 20 and the brake arm 4.

[Problems to be Solved by the Invention] However, the conventional foot-operated parking brake described above has a complicated structure, and the lock spring and clutch spring are arranged in parallel to the spindle, so There is a problem in that the length increases and the overall size of the device increases.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a foot-operated parking brake that can be made more compact.

[Means for Solving the Problems] In order to achieve the above object, the foot-operated parking brake of the present invention includes a spindle that is fixed to the vehicle body side and has a cylindrical body integrally provided on one end side, and this spindle. a rotary body rotatably mounted at a position facing the cylindrical body on the other end side and linked to the brake arm; a damper case interposed between the support shaft and the rotary body; and the support shaft. and the rotary body, the lock spring is wrapped in a close contact state, and has one end locked to the support shaft and the other end locked to the lock release member, and the rotary body and the damper case. The present invention is characterized by comprising a clutch spring that is wrapped around and housed in a tight state, and a viscous substance that fills a gap between the support shaft and the damper case.

[Operation] When the brake arm is depressed and then released, the rotating body and damper case rotate as one, and a shearing force acts on the viscous material filled in the gap between the damper case and the support shaft. . Therefore, the rotational force of the brake arm is absorbed to some extent by the viscous resistance of the viscous substance, so the brake arm returns at a slow speed. Further, the clutch spring and the lock spring are not arranged in parallel to the support shaft, but are mounted double on the outside and on the outside, resulting in a compact design.

[Example] Hereinafter, an example of the present invention will be described based on FIG. 1, and the same reference numerals will be given to the same components as in the prior art.

In FIG. 1, the support shaft 3 is composed of a large diameter portion 3a at one end, a cylindrical portion 3b, and a small diameter portion 3C extending from one end to the other end. is fixed. A substantially cylindrical rotating body 6 that is connected to a brake arm (not shown) is attached to the other end of the support shaft 3 at a position facing the cylindrical body portion 3b of the support shaft 3. Between this rotating body 6 and the cylindrical body part 3b of the support shaft 3, a damper case 7 having a double cylindrical shape surrounds the cylindrical body part 3b.
is interposed.

In addition, a lock spring 22 is externally wrapped around the large diameter portion 3a of the support shaft 3 and the rotating body 6 in a close state. 22a is locked to the support shaft 3, and the hook portion 22b at the other end is locked to a lock release ring 23 as a lock release member. Further, a clutch spring 27 is installed inside the rotating body 6 and the damper case 7 in a tight state, and the clutch spring 27 is made of a coil spring with a rectangular cross section, and the hook portions at both ends thereof are free ends. ing.

A gap between the cylindrical body portion 3b of the support shaft 3 and the damper case 7 is filled with a viscous substance such as viscous grease. In addition, in the figure, symbols 9 and 10 indicate the support shaft 3 and the damper case 7, respectively.
25 indicates a connecting plate for connecting the rotating body 6 to the brake arm, and 30 indicates a connecting plate for preventing the rotating body 6 from being removed. For this purpose, an E-ring fitted to the tip of the support shaft 3 is shown. Further, although not shown, the return spring is provided so as to span between the vehicle body frame 20 and the brake arm as in the conventional device.

In such a configuration, when the brake arm is depressed and rotated, the rotating body 6 connected to the brake arm via the connecting plate 28 rotates. In this case, the lock spring 22 expands in diameter and the clutch spring 27 contracts in diameter, so the damper case 7 is transferred to the support shaft 3 through the viscous substance.
It does not rotate as one unit. Therefore, in this case, since the shearing force of the viscous substance does not act, the brake arm can be depressed with a light force.

When this brake arm depression force is released, the rotational force in the opposite direction is transmitted to the brake arm and the rotating body 6 by the return spring, but in the rotating direction of the rotating body 6, the lock spring 22 contracts in diameter and the clutch spring 27 Since the diameter is in the expanding direction, the lock spring 22 tightens the rotating body 6 and the support shaft 3, and the clutch spring 27
tightens the rotating body 6 and damper case 7. As a result, rotation of the rotating body 6 is restricted, and the rotation of the brake arm is also locked, and the parking brake (
(not shown) is in a locked state.

To unlock the parking brake in this state, the lock release ring 23 is rotated in the unlocking direction. That is, the hook portion 22b at the other end of the lock spring 22 is engaged with the lock release ring 23. Since the rotating direction is the direction in which the lock spring 22 is wound, the lock spring 22 expands in diameter and is no longer tightened to the rotating body 6. Therefore, the return spring causes the brake arm to rotate in the opposite direction to that when the pedal is depressed.
A return is made. At this time, the clutch spring 27 expands in diameter, so the rotating body 6 and the damper case 7 rotate together, and the viscous substance filled between the damper case 7 and the cylindrical portion 3b of the support shaft 3 A shearing force acts on the brake arm, and the rotational force of the brake arm is absorbed to some extent by the viscous resistance of the viscous substance, so the brake arm returns at a slow speed.

In this embodiment, the lock spring 22 and the clutch spring 27 are not parallel to the support shaft 3, but are mounted twice on the exterior and interior, making it possible to achieve compactness.

FIG. 2 shows another embodiment of the present invention, and the same components as those in the embodiment of FIG. 1 are given the same reference numerals and redundant explanations will be omitted.

In this embodiment, the rotating body 6 has a double cylinder shape, and the damper case 7 has a triple cylinder shape, and both are in sliding contact with the small diameter portion 3a of the support shaft 3 in the embodiment shown in FIG. different from. Then, when the brake arm is depressed, the clutch spring 27, which is housed in the rotary body 6 and the damper case 7 in a tight state, expands in diameter as the rotary body 6 rotates and releases the brake arm from being depressed. Then, the rotating body 6 tries to rotate in the opposite direction, so that it acts to reduce its diameter. Other than that, it operates in the same way as the embodiment shown in FIG.
The operation and effect of the entire device are similar to those of the first embodiment. However, in this embodiment, the viscous substance is filled at the support shaft 3.
In addition to the gap between the cylindrical body part 3b and the damper case 7,
Since this extends to the gap between the damper case 7 and the small diameter portion 3C of the support shaft 3, the viscous resistance of the viscous substance that acts when the brake arm returns is large, and the brake arm becomes more rigid than the embodiment shown in FIG. It has the advantage of returning at a slow speed.

[Effects of the Invention] As described above, according to the present invention, the lock spring is wrapped around the support shaft and the rotating body so that they are tightly packaged, and the clutch spring is wrapped between the rotating body and the damper case so that they are tightly packaged. Since the structure is such that both springs are attached to the support shaft both inside and outside, the device can be made more compact.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the present invention, FIG. 2 is a sectional view of another embodiment, and FIG. 3 is a sectional view of a conventional device. 3... Support shaft, 3a... Large diameter part, 3b... Cylindrical body part,
3c... Small diameter portion, 6... Rotating body, 7... Damper case, 20... Vehicle body frame, 2
2...Lock spring, 23...Lock release ring, 27...Clutch spring.

Claims (1)

[Claims] (1) A support shaft that is fixed to the vehicle body and has a cylindrical body integrally provided on one end side, and is rotatably attached to the other end of this support shaft at a position facing the cylinder body, and is attached to the brake arm. a damper case interposed between the supporting shaft and the rotating body; a damper case that is wrapped around the supporting shaft and the rotating body in a close state, and has one end attached to the supporting shaft; A lock spring that is locked and whose other end is locked to a lock release member, a clutch spring that is wrapped around the rotating body and the damper case and is housed in a close state, and the support shaft and the damper case. A foot-operated parking brake characterized by comprising a viscous substance filled in the gap between the brake and the viscous substance.