JPH0117005B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic play stroke adjustment device for an operation wire of an operation system mainly applied to a brake operation system, a clutch operation system, etc. of a motorcycle.

In general, in motorcycles, etc., in which 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 inner wire of the operating wire may be damaged. Due to its elongation, 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, an automatic operating wire play stroke adjustment device has been proposed which adjusts the play stroke of the inner wire of the operation wire when it exceeds a predetermined amount. It is an object of the present invention to provide the above-mentioned device, which has a simplified and compact overall structure, and which allows the operating wire to be easily attached anywhere.

Hereinafter, a first embodiment in which the device of the present invention is applied to the operating wire of a brake device of a motorcycle will be described with reference to FIGS. 1 to 6. The operating wire W that connects the provided drum brake devices B and transmits the operating force of the brake lever L to the drum brake device B is an outer wire Wo and an outer wire Wo.
It consists of an inner wire Wi that is inserted inside.

An adjustment device 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" includes elongation of the inner wire itself and substantial elongation of the inner wire due to wear of the brake shoe of the drum brake device B.

Next, to explain the structure of the adjustment device, a two-part fixed housing 1 is installed at a suitable position on the body F of a motorcycle.
is arranged, and this fixed housing 1 constitutes a part of the outer wire Wo of the operation wire W,
The outer wire Wo is interposed in the middle, and the inner wire Wi runs vertically inside the housing 1.

An adjusting bolt 2 is inserted into the fixed housing 1 from one end thereof, and one end of an outer wire Wo connected to a drum brake device B is connected to the outer end of the adjusting bolt 2. As shown in FIG. 6, the adjusting bolt 2 is formed into an oval cross section with two symmetrical chamfers on both sides, and is installed in a U-shaped groove 4 formed at the end of the fixed housing 1 so that it cannot rotate and has a shaft. It is inserted and supported so that it can move in the direction. A cylindrical adjuster 3 is screwed into the threaded portion of the adjuster bolt 2 in the fixed housing 1, and the adjuster 3 is supported by the fixed housing 1 via an adjuster receiver 5 so as to be rotatable at a fixed position. . Therefore, when the adjuster 3 is rotated,
The non-rotatable adjuster bolt 2 moves axially with respect to the fixed housing 1, and the outer wire Wo
The length can be adjusted. A ratchet wheel 6 for rotating the adjuster 3 in one direction (clockwise in FIG. 5) is integrally formed on one side of the adjuster 3.

Close to the adjuster 3, an intermediate portion of an adjuster lever 7 is pivotally supported in the fixed housing 1 by a lever pin 8, and one first arm ₇₁ of the adjuster lever 7 has a hook shape and is attached to an inner wire Wi. It extends to one side and is fixed to this inner wire Wi, and has an adjustment gap δ between the actuator 9 and the adjustment gap δ, which will be described later.
They are facing each other. Also, asiast lever 7
The other second arm 7 ₂ is longer than the first arm 7 ₁ and has a ratchet wheel 6 in the middle.
The other end of a tension spring 10 is engaged with the ratchet pawl of the lever, and the other end of the tension spring 10 is fixed at one end to the fixed housing 1. It is biased so as to rotate counterclockwise in FIG. 1, and is engaged with a stopper 11 provided on the fixed housing 1. An actuating element 9 is fixed to the inner wire Wi, and a preset adjustment gap δ is formed between this actuating element 9 and the tip of the first arm ₇₁ of the adjuster lever 7. When the inner wire Wi is pulled to the left by more than the adjustment gap δ, the actuator 9 collides with the first arm ₇₁ , and the adjuster lever 7 is moved clockwise against the tensile force of the tension spring 10. It is designed to be able to rotate.

At the other end of the housing 1 (left end in Figures 2 and 3),
An adjustment mechanism Ma for the adjustment gap δ is provided. This adjustment mechanism Ma is a bolt 12 that is non-rotatably connected to one end of the brake lever side outer wire Wo.
A collar 13 fitted into the opening at the other end of the housing 1 and a nut 14 are screwed together.
By rotating the collar 13 and nut 14, the bolt 12 relative to the collar 13 can be adjusted to expand or contract, that is, the length of the outer wire Wo on the brake operating lever L side can be adjusted, thereby adjusting the adjustment gap δ.

Between one end (right end) of the fixed housing 1 and the end of the outer wire Wo on the drum brake device B side, and between the other end (left end) of the fixed housing 1 and the end of the outer wire Wo on the brake operating lever L side,
Each is covered with rubber seal boots 15 and 16.

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 to the left (to the left), the drum brake device B can be operated as usual via the operating wire W to apply brakes to the rear wheels Wr.

By the way, when the brake operation is repeated, the idle stroke amount during the brake operation gradually increases due to the elongation of the inner wire Wi itself and the wear of the brake shoe in the drum brake device B.

The amount of idle stroke of the inner wire Wi is now
When the adjustment gap δ becomes larger than the adjustment gap δ, the inner wire Wi is pulled to the left, and the actuator 9 fixed there hits the first arm ₇₁ of the adjustment lever 7, and the lever is pushed around the lever pin 8. Rotate clockwise in Figures 2 and 3. Then, when the brake operation of the brake operation lever L is released, the inner wire Wi is moved to the second and third positions by the spring force of the return spring (not shown) in the drum brake device B.
When returned to the state shown in the figure, the adjustment lever 7 is rotated counterclockwise by the tensile force of the tension spring 10 and returned to its original position. By the way, when pulling the inner wire Wi mentioned above, the amount of movement of the engaging portion of the ratchet wheel 6 of the second arm 72 due to the clockwise rocking of the adjuster lever ₇ is equal to 1 of the ratchet pawl.
If the adjustment lever 7 is rotated counterclockwise, the second arm ₇₂ engages with the ratchet pawl one position in front, and moves the ratchet wheel 6 clockwise in FIG. It rotates by one pitch, and the adjuster 3 is also rotated by the same amount in the same direction. When the adjuster 3 is rotated, the non-rotatable adjuster bolt 2, which is screwed into the adjuster 3, has a second
In Fig. 3, the outer wire Wo is pushed outward in the axial direction and the length of the outer wire Wo between the fixed housing 1 and the drum brake device B becomes longer, so the inner wire Wi is drawn into the outer wire Wo by that amount. , thereby adjusting the idle stroke of the inner wire Wi due to wear of the brake shoe and elongation of the inner wire Wi itself.

Then, while the play stroke during brake operation exceeds the adjustment gap δ, the adjustment is performed intermittently, and the play stroke exceeds the adjustment gap δ.
is adjusted to the appropriate amount.

A second embodiment of the invention is shown in FIGS. 7-9.

In this embodiment, the fixed housing 1 is integrally formed with a bracket 20 that is integrated with the handlebar H of the motorcycle, and is inserted through the fixed housing 1.
One end of the inner wire Wi of the operating wire W is tied to the base end of a brake operating lever L that is pivotally supported 21 on the mounting bracket 20. and inner wire
Wi is normally pulled to the right in FIG. 7 by the spring force of the return spring in the drum brake device B, and the brake operating lever L is held in the state shown in FIG.

One end of the outer wire Wo through which the inner wire Wi is inserted is housed inside the housing 1 through the open end thereof, and connected to an adjusting bolt 2 through which the inner wire Wi is inserted. The adjusting bolt 2 has two chamfers on both sides thereof, and a rotation prevention piece 22 fixed to the fixed housing 1 is engaged with the chamfer to prevent its rotation. An adjuster 3 integrally formed with a ratchet wheel 6 is screwed onto the adjuster bolt 2, and the adjuster 3 is rotatably supported by the fixed housing 1 via an adjuster receiver 5. The adjuster lever 7, which is pivotally supported in the fixed housing 1 with a lever pin 8, has a first arm ₇₁ connected to the inner wire Wi.
The second arm ₇₂ is engaged with the ratchet wheel 6. The adjustment lever 7 is biased by the torsion spring 23 to rotate counterclockwise in FIG. 7 until it hits the stopper 11. An actuator 9 is fixed to the inner wire Wi,
This actuator 9 and the first adjustment lever 7
The adjustment gap δ is formed between the arms ₇₁ .
When the inner wire Wi is pulled by the rotation of the brake operating lever L when the brake is applied, and if the inner wire Wi has an idle stroke of more than the adjustment gap δ, the collision between the actuator 9 and the first arm ₇₁ causes the inner wire Wi to be pulled. The adjustment lever 7 rotates clockwise in FIG. When the brake is released, the adjuster lever 7 is rotated counterclockwise by the spring force of the torsion spring 23, and at this time, the adjuster 3 is rotated to adjust the play stroke of the inner wire Wi to an appropriate amount as in the first embodiment. be adjusted. A seal boot 24 covers the space between the open end of the fixed housing 1 and the outer end of the adjusting bolt 2. In this second embodiment, the adjusting device A is provided near the brake operating lever L, so that it is protected from mud, splashes, and the like.

Note that the fixed 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 firmly fixed.

As described above, according to the present invention, a fixed housing is provided in the middle or at the end of the outer wire of an operating wire consisting of an outer wire and an inner wire, and when the idle stroke of the inner wire exceeds a predetermined amount, the In connection with the movement of the inner wire, the adjustment bolt connected to the outer wire is automatically pushed outward and controlled so that the play stroke can be adjusted to an appropriate amount, so the inner wire does not need to be adjusted at all. The idle stroke can be automatically adjusted only by adjusting the outer wire without having to do anything, and the overall structure can be greatly simplified and made compact, and can be provided at low cost. Further, since the adjusting device of the present invention can be installed anywhere on the operating wire, the degree of freedom in its installation is increased, and it is particularly effective when applied to vehicles where installation locations are restricted, such as motorcycles.

[Brief explanation of drawings]

Figures 1 to 6 show one embodiment of the device of the present invention. Figure 1 is a side view of a motorcycle equipped with the device of the present invention, Figure 2 is a vertical side view thereof, and Figure 3 is a side view of a motorcycle equipped with the device of the present invention. Figure 4 is a cross-sectional view along the line in Figure 2, Figure 5 is a cross-sectional view along the line in Figure 2, Figure 6 is a cross-sectional view along the line in Figure 2, and Figures 7 to 9 are the cross-sectional view along the line in Figure 2. 7 is a longitudinal sectional side view of a main part thereof, FIG. 8 is a sectional view taken along the line of FIG. 7, and FIG. 9 is a sectional view taken along the line of FIG. 7. δ...adjustment gap, W...operating wire, Wi...
Inner wire, Wo... Outer wire, 1... Fixed housing, 2... Adjustment bolt, 3...
Adjuster, 7... Adjuster lever, 9... Actuator, 20... Mounting bracket.

Claims (1)

[Scope of Claims] 1. In an operating wire for a brake operating device, etc., comprising an outer wire and an inner wire inserted into the outer wire, a fixed housing is connected to the middle or end of the outer wire, and the free end of the outer wire is connected to a fixed housing. An adjuster bolt is coupled to the housing that is movable in the axial direction and is supported non-rotatably, and an adjuster for controlling the movement of the bolt in the axial direction is screwed to the adjuster bolt. An adjustment lever that engages with a ratchet pawl of the adjuster to rotate it in one direction is pivotally supported within the fixed housing, and an inner wire that is inserted through the fixed housing is provided with an adjustment lever. Opposing actuators are fixed to the free end of the wire with a predetermined gap, and when the inner wire moves beyond a preset traction stroke, the actuator collides with the adjustment lever and An automatic play stroke adjustment device for an operating wire in a brake operating device, etc., which rotates and controls the adjusting bolt to be pushed out of the fixed housing via the adjuster. 2. An automatic play stroke adjustment device for an operating wire in a brake operating device or the like as set forth in claim 1, wherein the housing is integrally provided with a mounting bracket of an operating lever of the operating wire. Automatic adjustment device for play stroke of operating wire in etc.