JPS627016B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic play stroke adjustment device for an operating wire in a brake operating device for a motorcycle or the like.

Generally, in motorcycles, etc., where the brake operating lever and the brake device are connected and the operating force of the brake operating lever is transmitted to the brake device, the brake shoe in the brake device may be worn out or the operating wire may be damaged. Due to the elongation of the inner wire itself, the play stroke of the operating wire gradually increases, which is undesirable since it may change the feel of the brake operation to some extent.

Therefore, the present invention can automatically adjust the idle stroke of the inner wire of the operating wire when it exceeds a predetermined amount, and also regulates the final adjustment position so that no unreasonable force is applied to the adjustment mechanism during the final adjustment. The main object of the present invention is to provide an automatic idle stroke adjustment device for an operation wire in a brake operation device with a simple structure, which allows braking force to be reliably transmitted to a brake device without any brake force being applied.

Hereinafter, an embodiment in which the device of the present invention is applied to the operating wire of a drum brake device of a motorcycle will be described with reference to FIGS. 1 to 5. The operating wire W that connects the drum brake devices B and transmits the operating force of the brake lever L to the drum brake device B is composed of an outer wire Wo and an inner wire Wi inserted through the outer wire Wo, as usual. Ru.

An adjustment mechanism A for automatically adjusting the elongation of the inner wire Wi of the drum brake device B is interposed in the middle of the operation wire W. Here, "elongation of the inner wire Wi" refers to the elongation of the inner wire itself and the substantial elongation of the inner wire due to wear of the brake shoe (not shown) of the drum brake device B.

Next, to explain the structure of the adjustment mechanism, as shown in FIG. As shown in FIG.

An adjustment bolt 2 is inserted into the housing 1 from one end (right end in FIGS. 2 and 3) so as to be slidable in the axial direction.
The inner wire Wi is inserted, and the outer wire is connected to the drum brake device B at its outer end.
One end of the Wo is joined together. The adjusting bolt 2 has a large-diameter screw portion 3 formed at its inner end, and a large-diameter head 4 at its outer end. The threaded portion 3 has a male thread 3a carved on its outer periphery and a locking step portion 5 formed on its inner end surface. One end (1st, 2nd
Right end of the figure) The outer side of the adjusting bolt 2 when engaged with the stopper surface 6 formed on the inner wall (right side of Figures 2 and 3)
Movement is becoming restricted. The locking step portion 5 and the stopper surface 6 constitute a stopper mechanism in the present invention. A locking step 7 is also formed on the inner end surface of the large-diameter head 4, and this locking step 7 is located at one end of the housing 1 (right end in FIGS. 2 and 3).
The adjusting bolt 2 is engaged with the outer surface to restrict movement of the adjusting bolt 2 inward (to the left in FIGS. 2 and 3).

Inside the housing 1, adjust bolt 2
The threaded portion 3 is screwed into a female thread 8a formed on the inner surface of a cylindrical adjuster 8.
are rotatably supported by bearings 9 and 10 formed in the housing 1. A ratchet wheel 11 is integrally provided in the center of the adjuster 8 for rotating it in one direction (clockwise in FIG. 5).

Further, in the housing 1 close to the adjuster 8, an intermediate portion of a bell crank-shaped adjustment lever 12 is pivotally supported by a lever pin 13.
A is integrally extended with a second arm 12b on the other side, and a receiving piece 14 facing an actuator 18, which will be described later, is formed at the tip of the first arm 12a. A ratchet pawl 15 that is longer than one arm 12a and that engages with the ratchet teeth of the ratchet wheel 11 is formed at its tip. The other end of a tension spring 16 whose one end is tied to the housing 1 is locked at the tip of the second arm 12b, and the tension of this tension spring 16 moves the adjuster lever 12 counterclockwise in FIG. It is biased so as to rotate and is engaged with a stopper 17 provided integrally with the housing 1. Inside the housing 1, the inner wire
An actuator 18 is fixed to Wi, and this actuator 18
and the first arm 12a of the adjuster lever 12.
A gap is formed between the receiving pieces 14, and as will be described later, when the inner wire Wi is pulled to the left during brake operation, the actuator 18 collides with the first arm 12a and moves the adjuster lever 12. can be rotated clockwise in FIG. 2 against the tensile force of the tension spring 16.

As shown in FIGS. 2 and 3, a rubber seal boot 19 is connected between one end (right end) of the housing 1 and the end of the outer wire Wo on the side of the drum brake device B.
covered with.

Next, to explain the operation of the first embodiment of the present invention, in order to apply a brake to the drum brake device B, the brake operating lever L is rotated and the inner wire Wi of the operating wire W is moved in the direction of the arrow in FIGS. When the vehicle is towed, the drum brake device B can be activated to apply brakes to the rear wheels Wr as usual.

By the way, when the inner wire Wi is pulled to the left in FIGS. 2 and 3 by brake operation in a state where the play stroke amount of the operating wire W is appropriate, the actuator 18 moves to the first position of the adjuster lever 12.
The adjustment lever 12 is rotated clockwise as it hits the receiving piece 14 of the arm 12a. Less than 1 pitch. Therefore, even if the leftward pulling force of the inner wire Wi is released by releasing the brake operating force and the adjuster lever 12 is rotated counterclockwise by the tensile force of the tension spring 16, the adjuster 8 cannot be rotated. Therefore, no adjustment is made for the growth of the inner wire Wi.

As the brake operation is repeated, the idle stroke amount during the brake operation gradually increases due to the stretch of the inner wire Wi. If the elongation becomes large enough to interfere with brake operation, the inner wire Wi is pulled to the left in Figures 2 and 3, causing the actuator 18 fixed there to hit the receiving piece 14 of the first arm 12a. So, adjust lever 1
The second arm 12 when the second arm 12 is rotated clockwise.
The amount of movement of the ratchet pawl 15 in b is more than one pitch of the ratchet tooth of the ratchet wheel 11, and the ratchet pawl 15 drops to the ratchet tooth one position before. When the brake operation is released and the inner wire Wi is returned to its original position by the spring force of a return spring (not shown) in the drum brake device B, the adjuster lever 12 is counteracted by the tensile force of the tension spring 16. When the second arm 12b is rotated clockwise, the ratchet pawl 15 of the second arm 12b moves by more than one pitch of the ratchet tooth of the ratchet wheel 11 and falls onto the ratchet tooth one position in front of the ratchet wheel 11, as described above. When rotating back clockwise, the ratchet pawl 15 of the second arm 12b
engages with the ratchet tooth next to the front, and rotates the ratchet wheel 11 by one pitch clockwise in FIG. 5, and the adjuster 8 is also rotated by the same amount in the same direction. When the adjuster 8 is rotated and screwed into it, the adjuster bolt 2 (which does not rotate due to frictional engagement with the inner wire Wi) is pushed outward in the axial direction in FIGS. 2 and 3, and is substantially Since the length of the outer wire Wo between the housing 1 and the drum brake device B becomes longer, the inner wire Wi is drawn into the outer wire Wo by that amount, thereby adjusting the idle stroke amount due to the elongation of the inner wire Wi. . Then, by pulling the inner wire Wi, adjust the lever 1.
2 rotates, the amount of movement of the ratchet pawl 15 is equal to 1 of the ratchet teeth of the ratchet wheel 11.
The adjustment described above is repeated until the inner wire Wi has an appropriate idle stroke amount.

By the way, if the above-mentioned adjustment of the play stroke amount is repeated according to the elongation of the inner wire Wi, the adjuster bolt 2 will adjust to the housing 1 according to the adjustment.
It is pushed out, and the locking step 5 of the threaded portion 3 of the adjusting bolt 2 finally comes into contact with the stopper surface 6 of the housing 1, as shown in FIG. 4, and the adjustment is completed.

In this adjustment completed state, most of the large-diameter threaded portion 3 at the inner end of the adjuster bolt 2 is threaded into the female thread 8a of the adjuster 8, and the threading distance corresponds to the braking force during brake operation. Possesses enough strength to fully counter. In addition, this adjustment bolt 2 is equipped with an outer wire that does not rotate.
Since it is integrally connected to one end to prevent rotation with the adjuster 8, it is possible to reset it by simply rotating the adjuster bolt 2 without disassembling the housing 1 after the above-mentioned adjustment is completed. It is.

A second embodiment of the invention is shown in FIGS. 6 and 7. In this second embodiment, an adjustment bolt 2 is inserted into the housing 1 through an insertion hole 21 formed in one end wall of the housing 1, and the large diameter screw portion 3 is inserted into the housing 1.
The adjuster 8 is screwed on. Inside the housing 1, a stopper 22 made of a circlip, a resin collar, etc. is slidably fitted to the adjuster bolt 2, and the stopper 22 is made to face the inner surface of the outer wall of the housing 1. When the adjusting bolt 2 is pushed outward, the locking step 5 of the large diameter threaded portion 3
collides with the front stopper 22 to regulate its final adjusted position. Therefore, the locking step portion 5 and the stopper 2
2 constitutes a stopper mechanism in the present invention.

A third embodiment of the invention is shown in FIGS. 8 and 9. In this third embodiment, the adjusting bolt 2 inserted into the housing 1 has a male thread 3a carved in the equal diameter part except for the large diameter head 4, and the inner end part is left on the upper surface. A flat chamfer 23 is provided to prevent rotation. Further, a stopper pin 24 is fitted into the seal boot 19.
The flat lower surface of the holder is brought into contact with the chamfer 23. When the adjustment bolt 2 is pushed out to the final adjustment position, the locking step 25 formed at the end of the chamfer 23 engages with the stopper pin 24, and the final adjustment position of the adjustment bolt 2 is regulated. Ru. Further, the stopper pin 24 and the chamfer 23 work together to prevent the adjuster bolt 2 from rotating, and the stopper pin 24 and the locking stepped portion 25 constitute a stopper mechanism in the present invention.

FIG. 10 shows a fourth embodiment of the invention.
In this fourth embodiment, it is inserted into the housing 1.
As in the third embodiment, the adjusting bolt 2 has a male thread 3a carved in the same diameter part excluding the large diameter head 4, and a thread crushing part 26 is formed at the inner end of the male thread 3a. Ru. On the other hand, the adjuster 8 has a female thread 8a formed at its outer end to be screwed into the male thread 3a, and the remaining portion has a large inner diameter so that the adjuster bolt 2 can freely pass therethrough. Therefore, when the adjuster bolt 2 is projected outward to the final adjustment position, the screw thread crushing portion 26 reaches the end of the female thread 8a, stopping the rotation of the adjuster 8 and returning the adjuster bolt 2 to the final adjustment position. to regulate. Thus, the thread crushing portion 26 and the female thread 8
a constitutes a stopper mechanism in the present invention.

In the first to fourth embodiments described above, the housing 1 only needs to be configured so that it does not move in the longitudinal direction of the operating wire W, and does not necessarily need to be fixed.

As is clear from the above embodiments, according to the present invention, a housing is provided on the outer wire of the operation wire consisting of an outer wire and an inner wire, and when the idle stroke of the inner wire exceeds a predetermined amount, the inner wire is moved in the housing. Since the adjustment bolt connected to the outer wire can be controlled to be pushed outward in connection with the traction movement, the play stroke can be automatically adjusted to an appropriate amount, and there is no need to make any adjustments to the inner wire. Since only the outer wires are adjusted, the overall structure is greatly simplified, can be formed compactly, and can be provided at low cost.

In addition, the final adjustment position of the adjustment bolt is regulated by the stopper mechanism, which can be easily notified to the operator, and at the final adjustment position, the adjustment bolt and the adjuster screwed thereto are operated by the brake. The outer wire adjustment mechanism has a threading allowance sufficient to withstand the force, and can have sufficient strength to reliably transmit the brake operation force to the brake device.

[Brief explanation of the drawing]

1 to 5 show a first embodiment of the present invention, in which FIG. 1 is a side view of a motorcycle equipped with the device of the present invention, FIG. 2 is a vertical side view of the device of the present invention, and FIG. The figures are a cross-sectional view taken along the line shown in FIG. 2, FIG. 4 is a partial view of FIG.
The figures show a second embodiment of the present invention, FIG. 6 is a partial sectional view thereof, FIG. 7 is a sectional view taken along the line of FIG. 6, and FIGS. 8 and 9 show a third embodiment of the present invention. 8 is a partial sectional view thereof, FIG. 9 is a sectional view taken along the line of FIG. 8, and FIG. 10 is a partial sectional view showing a fourth embodiment of the present invention. W...Operating wire, Wi...Inner wire, Wo
... Outer wire, 1 ... Housing, 2 ... Adjustment bolt, 8 ... Adjustment star, 11 ... Ratchet wheel, 12 ... Adjustment lever,
18... Actuator.

Claims (1)

[Claims] 1. In an operating wire of a brake operating device consisting of an outer wire and an inner wire inserted into the outer wire, a housing is connected to the outer wire, and an adjusting bolt connected to one end of the outer wire is moved in the axial direction to the housing. An adjuster for controlling the movement of the adjuster bolt in the axial direction is screwed into the adjuster bolt, and an adjuster for controlling the movement of the adjuster bolt in the axial direction is screwed into the housing. An actuator capable of rotating the adjustment lever during pulling operation of the inner wire is fixed to an inner wire that pivotally supports an adjustment lever that can be rotated, and that is inserted through the housing and adjustment bolt, and that the inner wire is set in advance. When the actuator moves beyond the specified traction stroke, the actuator rotates the adjuster via the adjuster lever to push and control the adjuster bolt out of the housing. Between the adjustment bolt and the adjuster, the final extrusion position of the adjustment bolt is regulated, and at the time of final extrusion, a threading allowance sufficient to resist the brake operating force is maintained between the adjustment bolt and the adjuster. An automatic play stroke adjustment device for an operating wire in a brake operating device, which is provided with a stopper mechanism.