JPS6236911B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a one-way rotational feed mechanism in which an actuating body rotates in a fixed direction through a reciprocating stroke each time an axial reciprocating motion is applied to the actuating body. It is an object of the present invention to obtain the above-mentioned mechanism which is simple in structure and compact.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a brake device for a motorcycle and an automatic adjustment device for its operating wire will be described below with reference to the drawings.

In Figures 1 and 2, an operating lever Lh is pivotally supported on a lever holder Ha of a steering handle H of a motorcycle, and an operating lever is pivotally supported on a brake panel Ba of a drum type brake device B of a rear wheel Wr.
Lb and Lb are connected to each other via the operating wire W as follows.

That is, the operating wire W is composed of an outer wire Wo and an inner wire inserted inside the outer wire Wo, as usual.
Both ends of the inner wire Wi are connected to the operating lever Lh and the operating lever Lb, respectively, and both ends of the outer wire Wo are supported by a fixed lever holder Ha and a brake panel Ba.

An automatic adjustment device A is interposed in the middle of the operation wire W, and its structure will be explained next with reference to FIGS. 3 to 8.

The outer wire Wo of the operating wire W is divided into a first outer wire Wo ₁ on the operating lever Lh side and a second outer wire Wo ₂ on the operating lever Lb side in the middle, and a part of the inner wire Wi is accommodated between them. The cylindrical fixed housing 1 of device A is installed. The fixed housing 1 is disposed at a suitable position on the vehicle body F of the motorcycle, and the fixed housing 1
In FIGS. 3 to 5, the inner end of the second outer wire Wo ₂ is fixed to the left end wall (hereinafter, "left" or "right" refers to FIGS. 3 to 5), and the right end portion is The inner end of the first outer wire Wo ₁ is connected to the adjusting bolt 2, which is exposed outwardly.

In the fixed housing 1, the inner wire Wi
An adjuster rod 4 is fitted on the outer periphery of the adjuster rod 4, and the adjuster rod 4 is connected to a chuck 3 (sixth
The chuck 3 always applies a constant gripping force to the adjuster rod 4 under the tension of an annular spring 5 fitted into its outer circumferential groove 3g. Serrated one-way clutch teeth 3t, 4t that releasably engage with each other are formed on opposing surfaces of the chuck 3 and the adjusting rod 4. Right-hand movement, that is, operation lever Lh
They cooperate to allow movement to the side and prevent leftward movement, that is, movement to the operating lever Lb side.

First and second stoppers 6, 7 are provided in the fixed housing 1, sandwiching the chuck 3 in the axial direction, and there is only one space between the two stoppers 6, 7 that limits the axial movement of the chuck 3 to a constant stroke _S1 . distance is maintained. The above stroke S ₁ is the actuation lever
Corresponds to the proper play stroke of Lb. The first stopper 6 is composed of an annular vertical surface formed on the inner wall of the fixed housing 1 so as to support the front end surface of the chuck 3, and on the outer periphery of the vertical surface there is a cylindrical portion shallower in depth than the stroke _S1 . 6a are continuous, and the chuck 3 cannot be opened once it is fitted into the cylindrical portion 6a.

On the other hand, the second stopper 7 is composed of a circlip that is fixed to the inner wall of the fixed housing 1.

An end plate 9 is fixedly connected to the inner surface of the right end of the fixed housing 1 by engaging a key groove 10 and a key-shaped projection 11, and is also fixed by a circlip 12. This end plate 9 has a substantially oval-shaped locking hole 13 in the center, and the adjusting bolt 2 is inserted into the hole 1.
Chamfered portions 2a are formed on both sides so as to be slidably adapted to 3. Therefore, those chamfered portions 2a
By engaging with the flat surface of the rotation stopper hole 13, the adjustment bolt 2 is always prevented from rotating.

In addition, on the inner circumferential wall of the intermediate portion of the fixed housing 1,
The adjuster string 14 is fitted and fixed by a positioning pin 15, and the adjuster string 14 moves a cylindrical adjuster 16 screwed to the adjuster bolt 2 through a constant stroke S ₂ in the axial direction.
It is supported slidably and rotatably. The sliding stroke S ₂ of the adjuster 16 is regulated by a pair of left and right retaining rings 25 and 26 fixed to the adjuster 16 alternately abutting both left and right ends of the fixed adjuster string 14 .

A compression spring 17 is interposed between the adjuster 16 and the second stopper 7. This spring 17 pushes the adjusting bolt 2 to the right outside of the fixed housing 1 via the adjusting star 16 and
It applies tension to Wi, and its spring force is set to be weaker than the return spring (not shown) of brake device B. Further, the threaded portion between the adjuster 16 and the adjuster bolt 2 provides an axial displacement to the lower rotational adjuster bolt 2 to the right, that is, to the operating lever Lh side, when the adjuster 16 is rotated in a certain direction R. According to the axial displacement, the first
The effective length of the outer wire Wo ₁ can be increased.

Furthermore, first and second one-way clutch springs 18 and 19 are interposed between the left and right ends of the adjuster 16 and the adjuster string 14, respectively.

The first one-way clutch spring 18 has a coil portion 18a that is wound around the outer peripheral surface of the adjuster 16 with a certain tightening force, and a locking portion 18b that stands up from the right end of the coil portion 18a is attached to the left end of the adjuster 16. It is slidably engaged with the formed inclined groove 20.
In this case, when the adjuster 16 tries to rotate in the anti-R direction relative to it, the coil part 18a strengthens the tightening force on the adjuster 16 and frictionally connects with it, and when it tries to rotate in the R direction, the coil part 18a tightens the force less. It's starting to loosen up. Also, inclined groove 2
0 is relative to the generatrix of the cylindrical circumferential surface of the adjuster 16,
It is inclined toward the R direction toward the right.

The second one-way clutch spring 19 also has an adjuster 16
Coil part 1 wound with a certain tightening force on the outer peripheral surface of
9a, and a locking portion 19b standing up from the left end of the coil portion 19a is slidably engaged with a linear groove 21 formed at the right end of the adjuster 16. In this case, when the adjuster 16 tries to rotate in the anti-R direction relative to it, the coil part 19a strengthens the tightening force against the adjuster 16 and frictionally connects with it, and when it tries to rotate in the R direction, the coil part 19a tightens the force. It's starting to loosen up. Further, the straight groove 21 extends parallel to the generatrix of the cylindrical peripheral surface of the adjuster 16.

In the above, the adjuster string 14 and the first and second one-way clutch springs 18 and 19 are connected to the one-way rotation feed mechanism 27 of the present invention which rotates the adjuster 16 in a fixed direction R in conjunction with the reciprocating sliding movement of the adjuster 16. Configure. Thus, the adjuster string 14 corresponds to the guide tube of the present invention, and the adjuster 16 corresponds to the actuator of the present invention.

A retractable dustproof boot 22 is stretched between the fixed housing 1 and the first outer wire _Wo1 .

Next, the operation of this embodiment will be explained.

First, starting with the function that automatically compensates for the wear of the brake shoe of brake device B, if you operate the control lever Lh to pull the inner wire Wi,
The inner wire Wi moves along the outer wire Wo to the right, that is, to the operating lever Lh side, and the brake device B
The operating lever Lb is rotated, thereby the brake shoe comes into pressure contact with the brake drum and braking force is applied to the rear wheel Wr.

By the way, when the inner wire Wi moves to the right, the adjuster rod 4 that is integrally connected to it also moves to the right, so the chuck 3 that grips the adjuster rod 4 by the spring 5 also initially moves the inner wire Wi.
However, due to wear of the brake shoe, the right stroke of the inner wire Wi is
When the specified movement stroke _S1 is exceeded, as shown in FIG. 5, the chuck 3 comes into contact with the second stopper 7 and is prevented from moving to the right. , 4t, only the inner wire Wi and the adjuster rod 4 continue to move to the right, allowing the brake device B to operate reliably.

Therefore, when the operating lever Lh is released to release the brake, the operating lever Lb is rotated in the backward direction by the unillustrated return spring of the brake device B and pulls the inner wire Wi, so that the inner wire Wi and the adjuster rod 4 As a result, the chuck 3 moves to the left in the opposite direction to the previous step, but when the left movement reaches the specified stroke _S1 , the chuck 3 is supported by the first stopper 6 and stops, as shown in FIG. The one-way clutch tooth 3 is fitted into the portion 6a.
Since mutual separation of t and 4t is reliably prevented, leftward movement of the inner wire Wi is also stopped.

In this way, in brake device B, even if the brake shoe is worn out, the brake shoe is prevented from separating from the brake drum beyond the gap corresponding to the prescribed movement stroke _S1 of the chuck 3, and the brake shoe of brake device B is It is possible to maintain an appropriate gap between the brake shoe and the brake drum when the brake shoe is not in operation.

Next, regarding the function of eliminating the idle stroke of the inner wire Wi, if an idle stroke occurs in the inner wire Wi due to the above-mentioned wear compensation of the brake shoe or due to its own elongation, when the brake device B is not activated, the fourth As shown in the figure, the adjustment bolt 2 is attached to the compression spring 1 together with the adjuster 16.
The elastic force of 7 pushes the inner wire Wi out of the fixed housing 1 to the right and puts tension on the inner wire Wi. At this time, if the idle stroke of the inner wire Wi is equal to or greater than the specified sliding stroke _S2 of the adjuster 16, the left stop ring 25 comes into contact with the adjuster string 14.

Therefore, when the inner wire Wi is towed by operating the operating lever Lh to operate the brake device B, since the elastic force of the compression spring 17 is set to be weaker than the return spring of the brake device B, the elastic force of the compression spring 17 is set to be weaker than the return spring of the brake device B. 1 Due to the stretching force applied to the intermediate bending portion of the outer wire Wo ₁ , the adjuster bolt 2 moves to the left together with the adjuster 16 against the elastic force of the spring 17, and as shown in FIG. 26 comes into contact with the adjuster string 14 to prevent the first outer wire Wo ₁ from expanding, and then the inner wire Wi starts moving to the right and the brake device B is activated. In this way, each time the brake device B is activated and released, the adjuster 16 reciprocates to the left and right together with the adjuster bolt 2, and at the same time the adjuster 16 moves back and forth to the left and right, and at the same time the adjuster 16 is connected to the first and second coil parts 18a and 19a wound around the adjuster 16, respectively. Directional clutch spring 1
8 and 19 also reciprocate.

When the two one-way clutch springs 18 and 19 move to the left with the operation of the brake device B, the locking portion 18b of the first one-way clutch spring 18 is guided into the fixed inclined groove 20 and the coil portion 18a is rotated in the counter-R direction, but the second one-way clutch spring 19
In this case, the locking portion 19b is restricted by the fixed linear groove 21 and does not rotate the coil portion 19a. Therefore, as described above, the first coil portion 18a weakens the tightening force on the adjuster 16, so the rotational torque applied to the adjuster 16 in the counter-R direction is weak, whereas the second coil portion 19a
6 tries to rotate in the counter-R direction, the tightening force is increased as described above and the adjuster 16 is frictionally connected to the adjuster 16, so that the adjuster 16 is eventually prevented from rotating by the first one-way clutch spring 18, which is not rotatable.

On the other hand, when the two-way clutch springs 18 and 19 move to the right when the brake device B is released, the first
In the one-way clutch spring 18, the locking part 18b is guided by the inclined groove 20 to rotate the coil part 18a in the R direction, but in the second one-way clutch spring 19, the coil part 18a is not rotated as before. Therefore, the first coil portion 18a now strengthens the tightening force against the adjuster 16 and applies a strong R to it.
In contrast, when the adjuster 16 tries to rotate in the R direction, the second coil portion 19a weakens the tightening force, so that the adjuster 16 eventually rotates in the R direction together with the first one-way clutch spring 18. When the adjuster 16 rotates in the R direction, the unrotatable adjuster bolt 2 is sent out to the right from the fixed housing 1, increasing the effective length of the first outer wire Wo _1. As a result, the length of the inner wire Wi is increased. The play decreases in the stroke, and by repeating the above operation, the inner wire Wi
If the idle stroke of brake device B disappears,
Even when the brake device B is not activated, the right stop ring 26 is kept in contact with the adjuster string 14, and the brake device B
Even when the adjustment bolt 2 is repeatedly activated and released, it does not move laterally.

In the above embodiment, if the inner wire Wi between the fixed housing 1 and the brake device B is arranged in a straight line depending on the installation position of the automatic adjustment device A, the second outer wire Wo ₂ can be omitted. Of course, it is necessary to fix the fixed housing 1 to the vehicle body F. In short, in any case, it is sufficient that the fixed housing 1 cannot be moved at least in the axial direction of the operating wire W.

As described above, according to the present invention, the inclined groove 20 and the straight groove 21 are formed in the guide tube (adjuster string 14), and the actuating body (adjuster 16) is rotatably and slidably fitted into the guide tube. A pair of first and second one-way clutch springs 18 and 19 are wound around the outer periphery with a constant tightening force, and the locking portion 18b of the first one-way clutch spring 18 is inserted into the inclined groove 20.
Also, the locking portion 19b of the second one-way clutch spring 19
are slidably engaged with the linear grooves 21, respectively,
When the actuating body tries to rotate in one direction (anti-R direction) relative to the two one-way clutch springs 18 and 19, the two one-way clutch springs each strengthen the tightening force, but the tightening force increases in the other direction (in the R direction). Since the tightening force is weakened when the actuating body tries to rotate, the first one-way clutch spring 18 and the inclined groove 20, the second one-way clutch spring 19 and the linear groove are Due to each of the 21 interactions,
The operating body can be rotated in the other direction according to its reciprocating stroke. Moreover, since the above structure uses fewer members and is achieved by concentrically arranging them, it is possible to obtain a one-way rotary feed mechanism with a simple and compact structure.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Figure 1 is a side view of a motorcycle equipped with an automatic adjustment device to which the unidirectional rotational feed mechanism of the invention is applied, and Figure 2 is a side view of a motorcycle equipped with an automatic adjustment device. Figure 3 is a sectional view taken along the line - - in Figure 2, Figure 4 is a sectional view taken along the line - - in Figure 3, and Figure 5 is a connection system diagram between the brake device and its operating lever.
6 is a sectional view taken along the line ``-'' in FIG. 3, ``FIG. 7'' is a sectional view taken along the ``-'' line in FIG. 3, and FIG. 8 is an exploded perspective view of the one-way rotation feed mechanism in the automatic adjustment device. . 14... Asia string as a guide tube, 16
... Adjuster as an operating body, 18... First one-way clutch spring, 18b... Locking portion, 19... Second one-way clutch spring, 19b... Locking portion, 20... Inclined groove, 21... Straight groove, 27... One Directional rotation feed mechanism.

Claims (1)

[Claims] 1. An inclined groove 20 inclined in the circumferential direction with respect to the generatrix of the circumferential surface of the cylinder and a straight groove 21 parallel to the generatrix are formed in the guide tube, and the guide tube is fitted into the guide tube so as to be rotatable and slidable. A pair of first and second one-way clutch springs 18 and 19 are wound around the outer periphery of the operating body with a predetermined tightening force, and the locking portion 18b of the first one-way clutch spring 18 is inserted into the inclined groove 20 and The locking portions 19b of the two one-way clutch springs 19 are slidably engaged with the linear grooves 21, and the two one-way clutch springs 18 and 19 are arranged so that the operating body is moved in one direction relative to them. When the actuating body attempts to rotate in the opposite direction, each tightening force is strengthened, but when attempting to rotate in the other direction, the respective tightening forces are weakened. A one-way rotary feed mechanism configured to rotate in the other direction according to the stroke.