JPH062853Y2 - Parking brake cable tension adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a tension adjusting device for a parking brake cable installed in an automobile.

[Prior Art] In a parking brake that uses a brake cable, extension of the brake cable occurs due to its long-term use, and when this extension becomes significant, it becomes difficult to effectively operate a mechanism such as a brake. Therefore, an automatic adjustment mechanism for the length (tension) of the brake cable has been developed in order to absorb the extension when the brake cable is stretched and always expect a stable operation of the brake or the like. For example, as a conventional automatic adjusting mechanism of this type, a structure shown in FIG. 2 is disclosed in Japanese Patent Laid-Open No. 50-141036. This automatic adjustment mechanism is based on FIG. 2 and is as follows, and 16 is a base fixed to the body (not shown) of the automobile. A lever 18, a first clutch 4 and a second clutch 10 are rotatably provided on the base 16 via a shaft 17 independently of each other. The wire 1 having one end connected to a parking brake (not shown) has the other end fixed to the drum 3 of the first clutch 4 by the connector 2.

The arrangement order is the first clutch 4, the second clutch 10, the base 16, and the lever 18 in this order when viewed from the front in FIG.

The first and second clutches 4 and 10 are substantially fan-shaped as a whole, and teeth 6 and 12 are formed at arcuate peripheral ends, respectively. A play hole 5 having a substantially rectangular shape penetrates through the first clutch 4, and the operating portion 11 of the second clutch 10 is inserted into the hole 5.
Is included. Reference numeral 21 denotes an operating portion 11 in the play hole 5.
The play width (shown as a tab in the figure) is shown.

Further, the lever 18 has two claws 7 and 24 attached to the base 16
One claw 13 is rotatably attached to each of the shafts 8 and 1.
It is provided via 4,18. 1st claw 7 and 2nd claw 1
3 are biased by springs 9 and 15 respectively, so that the teeth 6 of the first clutch 4 and the teeth 12 of the second clutch 10 are
It is always engaged. The third tab 24 is the operating rod 2
3 selectively engages the teeth 25 formed on the arcuate peripheral edge of the base 16.

The teeth 6 and 12 of the first and second clutches 4 and 10 and the first and second claws 7 and 13 constitute a so-called one-way clutch. That is, referring to FIG. 2 as an example, the first and second clutches 4 and 10 can freely rotate in the counterclockwise direction, but the claws 7 and 1 cannot rotate in the clockwise direction.
3 is suppressed.

[Problems to be solved by the invention] However, in such a conventional automatic adjustment mechanism,
When the brake lever 18 is pulled more than the play width of 21, the wheel 4 is fixed at a position moved counterclockwise with respect to the brake lever 18, and the play of the brake cable 1 is adjusted. Even if there is no play in the cable 1, if the brake lever 18 is pulled with an excessive force, similarly, the wheel 4 is fixed at the position moved counterclockwise with respect to the brake lever 18, and at the position where the brake lever 18 is returned. There is a problem that the brake cable 1 is stretched more than necessary, the clearance between the brake shoe (not shown) and the brake drum (not shown) is reduced, and the brake is dragged.

[Means for Solving the Problems] The present invention has been made in view of such a problem. One wheel corresponds to the clutch described in the conventional example, and a ratchet having a claw meshed with the wheel is provided. We provide a tension adjustment device for the parking brake cable that has the function of not adjusting the brake cable so that the cable tension when the brake lever is returned to the conventional function drags the brake with the configuration of sticky claw and To do.

[Embodiment] The present invention will be described in detail below with reference to an embodiment shown in FIG.

Reference numeral 31 is a hand brake lever for operating a parking brake, and the hand brake lever 31 is rotatably supported by a base 32 fixed to the vehicle body via a support shaft 33.

Reference numeral 34 denotes a wheel rotatably supported by the support shaft 33. A ratchet gear 35 is formed on the peripheral edge of the wheel 34. The ratchet gear 35 is provided on the hand brake lever 31 and a support pin. A ratchet 37, which is pivotally connected via 36, is meshed with the elastic force of a spring 45. Reference numeral 38 denotes an arcuate drum fixed to the side surface of the wheel 34. One end of the brake cable 39 is fixed to the drum 38 via a connector 40 so that the brake cable 39 is guided. ing. An arm 41 is pivotally attached to the support shaft 33, and a stick-like claw 43 is slidably held at the tip of the arm 41. The sticky claw is held in mesh with the ratchet gear 35 by the elastic force of the spring 44. Reference numeral 46 denotes a ratchet pivotally supported on the handbrake lever 31 via a support pin 47. The ratchet 46 meshes with a ratchet gear 48 provided on the base 32 to tilt the handbrake lever 31. It holds the position. Reference numeral 49 denotes a release button for disengaging the ratchet 46 and ratchet gear 48 from each other, which is connected to the ratchet 46 via a rod 50. The base 32 is provided with stoppers 32a and 32b which are engaged with the tip 41 'of the arm 41 and restrict the rotation range of the arm.

The structure of the present embodiment is as described above. Next, the operation thereof will be described. When the parking brake is operated, if the hand brake lever 31 is pulled in the direction of arrow A, the ratchet 37 and the ratchet are attached to the hand brake lever 31. The wheel 34, which is engaged through the gear 35, rotates counterclockwise in the drawing, and as a result, the brake cable 39 is pulled while being guided by the drum 38, and the parking brake operates. At this time, if the pulling margin of the hand brake lever 31 is large, the tip 41 'of the arm 41 is
Is rotated until it comes into contact with the stopper portion 32a, and further movement of the arm 41 is prevented.
Since only the ratchet 43 is further rotated counterclockwise, the meshing of the ratchet 43 changes with the new ratchet gear 35 (the meshing teeth of the ratchet gear move to the right in the drawing). Next, when releasing the parking brake, the release button 49 is pressed in this state to release the engagement between the ratchet 46 and the ratchet gear 48, and the hand brake lever 31 is moved to the B position.
When the handwheel lever 31 is rotated in the direction, the wheel 34 is restored while the engagement between the ratchet 37 and the ratchet gear 35 is maintained with the operation of the handbrake lever 31. At the time of this restoration, the relative position between the arm 41 and the wheel 34 is the position where the arm 41 is rotated clockwise when viewed from the wheel 34, so that the arm 41 of the arm 41 is in the middle of returning to the original position. The tip 41 'is the stopper 32b
, And the arm 41 is not rotated any further. When returning the brake lever 31 further, the brake cable 39
If no tension is generated on the wheel 34, the wheel 34 is pressed by the stick-shaped claws 43 so as not to rotate any more, and the ratchet 37 rides over the ratchet gear 35 to reach a new meshing position. Further, if the brake cable 39 is not stretched and tension is generated in the brake cable 39, the force is applied to the wheel 34 in the clockwise direction, so that the ratchet 37 and the ratchet gear 35 are kept in mesh with each other. The stick-shaped claw 43 is released, and the wheel 34 returns with the brake lever 31. Thus, if the brake cable 39 is extended, the ratchet 37 provided on the brake lever 31 and the ratchet gear 35 provided on the wheel 34 are operated by the series of operations of the brake lever described above. Since the meshing position is automatically changed and the extension of the brake cable 39 is absorbed, the brake is always operated with a constant hand brake pulling margin.

Therefore, according to the parking brake cable tension adjusting device of this embodiment, when the brake lever 31 is returned to the function of absorbing the extension of the brake cable 39 if the pulling amount of the brake lever 31 is large. When the tension is generated, the sticky claw is disengaged and the function of preventing the tension of the brake cable 39 from exceeding a certain value is added, and there is an effect that the drag of the brake does not occur.

As described above, according to the present invention, the support shaft 3 attached to the base 32 is provided.
A drum 38 which is pivotally supported by 3 and which locks one end of a brake cable 39, and a wheel 34 which forms a ratchet gear 35 on the periphery thereof, and which is pivotally supported by the support shaft 33 and formed on the base 32. In a handbrake device having a handbrake lever 31 that supports a ratchet 46 that is meshed with a ratchet gear 48, an arm that holds a stick-shaped pawl 43 that meshes with the ratchet gear 35 on the support shaft 33. 41 is pivotally supported, and the handbrake lever 31 is provided with a ratchet 37 that meshes with the ratchet gear 35 to transmit the rotation of the handbrake lever 31 to a wheel 34. Stoppers 32a and 32b for restricting the rotation range of the arm 41 that operates with the rotation of the wheel 34 are provided. A tension adjusting device of the parking brake cable, characterized in that digit.

[Advantage of Invention] Therefore, according to the tension adjusting device for the parking brake cable of the present invention, the brake lever 31 is returned to the function of absorbing the extension of the brake cable 39 if the pulling amount of the brake lever 31 is large. At this time, when the tension of the brake cable 39 is generated, the sticky claw is disengaged and the function of preventing the tension of the brake cable 39 from exceeding a certain value is added, so that the drag of the brake does not occur.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing an embodiment of a tension adjusting device for a parking brake cable according to the present invention, and FIG. 2 is an explanatory view of a conventional example. 31 ... Hand brake, 32 ... Base 32a, 32b ... Stopper part, 33 ... Spindle 34 ... Wheel, 35 ... Ratchet gear 36 ... Support pin, 37 ... Ratchet 38 ... Drum, 39 ... Brake cable 40 ... Connector, 41 ... Arm 41 '... Tip, 43 ... Claw 44 ... Spring, 46 ... Ratchet 47 ... Support pin, 48 ... Ratchet gear 49 ... Release button, 50 ... Rod.

Claims (1)

[Scope of utility model registration request] 1. A drum (38) pivotally supported by a support shaft (33) attached to a base (32) and holding one end of a brake cable (39), and a ratchet gear (35) around the drum (38). The formed wheel (34) and the support shaft (33) are pivotally supported and the base (3
Handbrake lever (31) supporting the ratchet (46) that meshes with the ratchet gear (48) formed in 2)
In the handbrake device having the above-mentioned support shaft (33)
In addition, due to the elastic force of the spring (44), the ratchet gear (35)
Arm (41) that holds the stick-like claw (43) that meshes with the
The hand brake lever (31) is provided with a ratchet (37) that meshes with the ratchet gear (35) to transmit the rotation of the hand brake lever (31) to the wheel (34). Furthermore, the above base (32) has wheels (3
A tension adjusting device for a parking brake cable, which is provided with stopper parts (32a) (32b) for restricting a rotation range of the arm (41) that operates in accordance with the rotation of (4).