JPS62292913A - Tension adjusting device for control wire - Google Patents

Abstract

PURPOSE:To ensure constant and adequate tension to a wire so as to automatically avoid both permanent elongation of the wire and excessive tension acting on the wire, by constituting the system so that the wire-tension-adjusting-action is performed every time the wire operating means is in operation. CONSTITUTION:A rod 4 forming the first member is connected to an end of a wire 3 in such a manner that the rod 4 does not rotate. A male screw 5, which has a blunt pitch-angle and which acts as the first screw, is formed on the rod 4. A torsion spring 7 as an adjusting spring is arranged at the tip of the rod 4. A nut 9, which is screwed with the male screw 5 of the rod 4 and acts as the second member, is housed in a carrier 10 in such a manner that the nut 9 can freely rotate and move in the axial direction. Owing to rotation-locking means 17, 13 and 22, this nut 9 can freely rotate when the operation means is on the return-position, while it is restrained from rotating when the operation means is apart from the return-position.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a tension adjustment device for a manipulation wire. More specifically, when permanent elongation occurs in the wire or excessive tension occurs in the wire, the permanent elongation and excessive tension are automatically resolved and the most appropriate tension is always applied to the wire. The invention relates to a device that can be adjusted to

[Conventional technology]

2. Description of the Related Art Conventionally, operating wires (hereinafter simply referred to as wires) made of, for example, twisted steel wires or synthetic resin wires have been widely used as means for remotely controlling driven devices such as automobile clutches.

One end of such a wire is connected to a driven device such as a clutch or brake that is always biased in the return direction by a return spring, and the other end is connected to an operating means such as a clutch pedal or hand lever, and the intermediate portion thereof is It is typically routed in a series of pulleys mounted on a fixed member, such as the frame of a motor vehicle, or slidably guided by a conduit fixed at both ends on said fixed member. The latter is a mechanism known as a control cable (Bowden cable).

With the wiring as described above, when the operating means is operated in the pulling direction of the wire, the movement is transmitted to the driven device such as the clutch via the wire, and the operation is performed against the biasing force of the return spring. When the force on the wire is released, the return spring causes the driven member to return to its original position.

On the other hand, as mentioned above, wires made of steel wire etc.
Because it is subjected to repeated tension and relaxation operations over a long period of time, it gradually stretches and undergoes permanent elongation from which it cannot return to its original state.

As a result, the wire may become slack, and the operating force may not be transmitted accurately.

In order to absorb such permanent elongation of the wire, for example, the actual length of the wire can be adjusted directly by separating the wire in the middle and winding the separated end around a pulley, or by adjusting the length of the control cable. A method is adopted in which the length of the conduit is adjusted to be extended by a t:y operation of a screw at the attachment end of the conduit, and the length of the inner cable is relatively shortened.

The elongation absorption work is extremely complicated because it must be performed every time elongation occurs. In order to solve this drawback, there are methods that automatically absorb the elongation of the wire, such as Utility Model Application No. 51-792G8 and Utility Model Application No. 5L-792G8.
The one disclosed in Japanese Patent No. 2-21358 is known.

[Problem that the invention seeks to solve]

By the way, in addition to the above-mentioned permanent elongation, wire elongation includes elastic elongation, which temporarily elongates only when an external force is applied and returns to its original state when the external force is removed.

All of the conventional elongation absorbing devices described above absorb the elongation of the inner cable using a one-way clutch means that combines a ratchet and a pawl, so they absorb not only the permanent elongation of the wire but also the elastic elongation. There is a problem with putting it away. For example, when such a device is used in an automobile clutch device, it absorbs the apparent elongation of the wire that occurs due to distortion of the car body while driving, as well as the elastic elongation caused by overload during operation. . Therefore, excessive tension is generated in the wire, and the clutch device is always in a half-clutch state, which may lead to burnout of the clutch plate. In addition, when used for brakes, the brake rate remains low and the brake lining is burned for 1 m.
There are problems such as

On the other hand, as parts such as the clutch plate of the clutch device and the brake lining of the brake device gradually wear out, the length of the wire becomes insufficient and excessive tension is generated in the wire. In that case, the length of the wire may need to be increased to eliminate excessive tension. However, there has been no known tension adjusting device with a simple structure that can automatically adjust the length of the wire in such a case.

In addition to the ability of conventional devices to automatically adjust the length of the wire to shorten it when the wire tension is relaxed, the present invention also automatically adjusts the length of the wire when excessive tension is applied to the inner cable. It is an object of the present invention to provide a tension adjustment device for a manipulation wire that can be adjusted to increase its length, has a simple structure, and has reliable operation.

[Means for solving problems]

The operating wire tension adjustment device of the present invention is provided between an operating wire whose one end is connected to a reciprocating driven member which is always urged in the return direction by a return spring, and an operating means for the wire. a first member interposed therebetween and (ω) connected to the other end of the wire so as not to rotate about its own axis, and having a first thread with a loose pitch concentric with the wire; (c) a Tz2 member that is fitted with the first member and has a second screw that is threadedly engaged with the first screw; and (c) a Tz2 member that rotatably supports the second member and is connected to the operating means. <d> an adjustment spring for biasing the first member in the wire pulling direction at least when the operating means is near the return position; +8)
a rotation locking mechanism for freeing rotation of the second member when the operating means is in the return position and restraining rotation of the second member when the operating means is away from the return position; It is configured.

Note that a screw with a loose pitch angle as referred to in the claims refers to a screw whose lead is sufficiently long compared to the effective diameter of the screw, so that one of the first member and the second member that are screwed together is fixed in the axial direction. A screw that can move itself while rotating the other when pushed or pulled.

[For production]

The rotation of the second member is always restrained by the locking means, except when the rotational locking means is temporarily released when the operating means is in the return position. Therefore, under normal conditions, the operation of pulling or returning the operating means is transmitted from the carrier to the second member, and then transmitted to the first member by the engagement of the screw of the second member and the screw of the first member, and then transmitted to the wire. As a result, the driven device is also pulled against the force of the return spring or returned by the force of the return spring.

In the device of the present invention, the first member and the first member are always screwed together, and by locking or unlocking the rotation of the second member, movement of the first member in the axial direction with respect to the second member is prevented. indirectly binding or permitting. Therefore, compared to locking by direct engagement between the locking pawl and the tooth row, the locking and unlocking action is much smoother, there is less scratching of the engaging part, and there is no step. It has the advantage of being adjustable.

While the rotation locking means is temporarily released, the first member can freely move in the axial direction while rotating the second member. Therefore, when permanent elongation occurs in the wire, the first and second members move relative to each other to shorten the effective length of the wire due to the action of the adjustment spring, and the rotation locking means is reengaged. At the time when the wires meet, the permanent elongation of the wire has been absorbed.

Also, if excessive tension is applied to the wire,
When the wire is pulled toward the driven member, the member and the second member move in a sealed manner to extend the effective length of the wire, thereby eliminating excessive tension in the wire.

Note that if there is no permanent elongation or excessive tension in the wire, the first member and second member will not move relative to each other even when the rotation lock is released, and the wire will be re-attached while maintaining an appropriate tension. A rotational locking means is engaged.

The above-mentioned rotation zeroing action and wire tension adjustment action are as follows:
This is done each time the wire reciprocates once, that is, each time the operating means such as the clutch pedal returns to the return position, so the wire is automatically adjusted to the appropriate tension state at all times.
Maintenance free is achieved.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings.

Fig. 1 is a vertical sectional view showing one embodiment of the device of the present invention, Fig.
3 is a perspective view of the device shown in FIG. 1; FIG. 4 is an enlarged cross-sectional view of important parts such as a carrier in the device shown in FIG. 1; FIG. 5 is an enlarged cross-sectional view of a main part showing the operating state of the carrier etc. shown in FIG. 4, and FIG. 6 is an explanatory diagram showing the operating state of the clubchi operating device equipped with the device shown in FIG. 1.

In Figures 1 and 4, the clutch pedal (31)
This shows a state in which the operating means are not operated, so the wire (3) and rod (4) are pulled back in the direction of arrow (B) by the return spring ((39) in Figure 6). . FIGS. 2 and 5 show a state in which the operating means is being operated in the opposite direction, and the wire (3) and the like are being pulled in the direction of the arrow (A).

In FIGS. 1 and 2, (1) is a stationary member such as the body of an automobile, and an opening (2) is formed in the stationary member (1). The opening (2) has a wire (3) connected at one end to a movable member (for example, the lever (311) in FIG. 6) provided in a driven device such as a clutch.
) is inserted through the wire (3), and a rod (4) constituting the first member is connected from one end of the wire (3) in the direction in which the wire (3) extends.

The surface of the rod (4) has multiple male threads with a loose pitch angle (
5) is formed as a first screw. The number of threads and the pitch angle of the threads are not particularly limited, but usually about 4 to 8 threads and 25 to 50' are used. Also rod (4
) and the nut (g) to be described later are not particularly limited, but may be made of, for example, S35C (zinc-plated MFZn5-C or the like), BsBM, or the like. Further, a ball screw or the like may be used as the first screw and the second screw.

Furthermore, as clearly shown in FIG.
) has a hole (6) formed at its tip, and one end (7) of the hole (6).
a) is inserted into the hole (6), and the other end (7b) is inserted into the stationary member (
A torsion coil spring (7) attached to 1) is arranged as an adjustment spring. A torsion coil spring (the force is elastically biasing the rod (4) in the direction of constantly pulling the wire (3), that is, in the direction of arrow (A), and also stops the rod (4) from rotating around its own axis. There is.

The other end (7b) of the torsion coil spring (7) may be always restrained by the stationary member (1), or the wire (3 ) may be swingably attached to the stationary member (1) within a certain range so that the biasing force acts only when the member (1) has returned to the vicinity of the return position.

A nut (g) constituting a second member is fitted on the outer periphery of the loft (4), and a nut (g) forming a second member is formed on the inner periphery thereof as a second screw (8) to be screwed into the male screw (5). ing.

As shown in detail in FIGS. 4-5, the nand (g) is housed in a cylindrical carrier (g) so as to be rotatable and capable of some axial movement. career G0
consists of a cylindrical body (10a) having a locking step (II+) extending radially inward at one end, and a fob screwed to close the other end of the loa. .

An opening 9' is formed inside the locking step 011, and a through hole (10c) is formed in the center of the cap (job). In the device shown in FIG. 1, the contact member 03) protruding from the opening O2 at one end is
9i and movable in the axial direction.
C) is housed within. The abutment portion holder 031 has a hole 04) for inserting the rod (4) and the locking step portion 0.
A flange area is formed which comes into contact with the inner surface of 1). The flange area is for preventing the contact member a3 from coming off from the carrier QO) when it is pushed in the direction of the arrow (+3) by the nut (g). Said Natsuto (
A flange portion Oe is also provided on the outer periphery of the carrier 00, and the flange portion aa is a step portion 07 formed on the inner wall of the carrier 00.
).

The rod (4) has a hole (14) formed in the abutting member n.
1, screw together with the nut (g), and then insert the cap (
It is assembled to the carrier 001 so as to protrude outside from the hole 031 of the lob.

A stopper n is provided at a position facing the tip of the abutting member (13) for pressing the abutting member G3 in the direction of the arrow (A) when the carrier 00) moves in the direction of the arrow (B). ing. The stopper is fixed, for example, to the stationary member (1), and further has a hole (22a) formed therein for passing the rod (4) therethrough.

The inner surface of the contact member Oa and one surface of the flange portion O■ (te
a) And between the other surface (IBb) of the flange portion Oe and the inner surface of the cap (10b), the balls Oa and the taker 09 for configuring the thrust ball bearing are accommodated, and the balls are accommodated in the carrier Gol. Natsuto (
g) The rotation is smooth.

In addition, the stopper, nut (g), and cap (10
When b) and nut (g) are each made of a material with low sliding friction, the ball Og;I and the contact member 0
3 may be configured so that they come into direct contact without intervening.

The nut (g) can move in the direction of the arrow (B) within the cavity of the carrier 001 until the flange portion Of3 comes into contact with the stepped portion Q7), and the nut (g) moves through the ball ○a to the cap (
10b) until it is stopped in the direction of arrow (A).

In the case shown in Fig. 4, the step part (+71) of the carrier (goods) constituting the friction surface and the flange part 0
One surface (1G'a) of the nut (g) is tapered, which strengthens the adhesion during contact and increases the frictional force between the two, that is, the force that locks the rotation of the nut (g). Although this configuration is adopted, the present invention is not limited to this configuration. The taper angle of the tapered surface may be appropriately selected depending on the material of the nut, etc., but is preferably about 0 to 45''.
For example, by forming radial serrations on 7),
The rotation locking effect may be further increased.

One surface (tea) of the flange Oe of the nut (g)
The stepped portion 07) of the carrier (10) is a friction surface that restrains the rotation of the nut (g), and the outer end surface of the contact member 03 is fixed to the stationary portion (1). When it comes into contact with the stopper, it pushes the nand (g) in the direction of the arrow (A) through the ball (181) between the one surface (18a) of the flange part (lfia) and the stepped part (+7). In other words, in the device shown in FIG. etc., when the operating means returns to the return position (
The rotation locking means is configured to allow the nut (g) to rotate freely when the nut (g) is in the position shown in FIG. There is.

Two pins (21) are protruded from the outer circumferential surface of the carrier (goods), and the pins (2D) are rotatably attached to the end of an operating means such as a latch petal (31) as shown in Fig. 6, for example. is supported by

For example, the tension adjusting device configured like a diagonal
The clutch pedal (31) of the clutch operating device shown in the figure
) side, connect the end of the wire (3) and the clutch pedal <
31) and the end portion (33) of the end portion (31).

In FIG. 6, (34) is a conduit for slidably guiding the wire (3), and together with the wire (3) forms a control cable (Bowden cable).

The conduit (34) is, for example, a cable cap (3) in FIG.
2) is fixed to the stationary member (n).

The device of the present invention can be used not only for such control cable wires but also for wires whose direction is changed or slidably guided by, for example, a bobbin or cable guide.

Further, (35) in Fig. 6 shows a conventionally known clutch, in which a clutch plate (37) and a clutch plate (37) are constantly urged in the direction of arrow (B) by a plate-shaped return spring (3B). It consists of a lever (38) for releasing the engagement. A return spring (39) is also provided on the latch pedal (31).

Next, the operation of the device will be explained with reference to FIGS. 1-2 and 6. Note that the solid lines in Figures 1 and 6 and
The imaginary lines in FIGS. 2 and 6 are in a relationship showing the main parts and the whole in the same state, respectively.

First of all, when the clutch pedal (31) is not depressed, the return spring (36) of the clutch (35) is pressed against the flange plate (
37) in the direction of arrow (B), the clutch plate (37) stops at a position where it comes into contact with a member (40) such as a flyhole. In that state, the wire (3) is also being pulled in the direction of the arrow (B), and the rod (4) and NAND (g
) and carrier 00) to the clutch pedal (31
) is also pulled back in the direction of arrow (F).

In the state shown by the solid line in FIGS. 1 and 6, the abutment member 03 in the carrier body comes into contact with the stopper, as shown in detail in FIG. It is away from the stepped portion 07). Therefore, the nut (g) can rotate freely, and the loft (4) can also freely move the arrows (A) and (B).
) direction.

The tension adjustment of the wire (3) according to the invention takes place in the meantime. In other words, if the wire (3) is slack due to permanent elongation, the torsion coil spring (7) is pulling the rod (4) in the direction of the arrow (A), so the rod (4)
) moves in the direction of arrow (A) while rotating nut (g). Therefore, the effective length of the wire (3) is shortened,
The elongation of the wire (3) is absorbed and the tension of the wire (3) is restored.

Also, if excessive tension is applied to the wire (3), the tension will cause the rod (4) to twist into the coil spring (7).
Pull the rod (4) in the direction of arrow (B) against the urging force of
moves in the direction of arrow (B) while rotating Nando (g). The effective length of the wire (3) is therefore increased and excess tension on the wire (3) is removed.

Then, as shown by the imaginary lines in Figures 2 and 6,
Clutch pedal (31) to release the clutch (35)
When you step on the button, the carrier ao) moves in the direction of the arrow (A).

In that case, as the abutment member (13) separates from the stopper, the flange fil) of the nand (g)
) is pushed in the direction of the arrow (toward) by the zero force. Therefore, one surface (16a) of flange part 0■ and step part 07
) The rotation of the nut (g) is restrained by the frictional force with
The nut (g) and the loft (4) are pulled against the biasing force of the return spring (36) in the direction of the arrow (A) without changing their relative positions so that the tension of the wire (3) is properly maintained. It will be destroyed.

Then, loosen the pressure on the clutch pedal (31) and press the flange fN (37) again. ! In the case of tightening, the operations are performed in the reverse order to the above, and after the clutch pedal (31) returns to its original position (the position shown in FIG. 1), the wire tension adjustment function is performed.

The device of the present invention can be installed in most machines [1
Since it is constructed to accommodate and hang wires, the length is 2/2 compared to conventional wire elongation absorbing devices used for the same wire.
3. It can be designed extremely compactly with a width of 273 mm and a weight of 172 mm, and can be produced at low cost.

Although preferred embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to these embodiments, and can be modified in various ways without departing from the spirit of the invention.

For example, as mentioned above, the rod (4) is restrained from rotating around its own axis by the torsion coil spring (7), so there is no need to provide a rotation stopper, or a cable fixed to the stationary member (1) if desired. A guide for stopping the rotation of the loft (4) may be formed on the cap (24) or the like.

Further, instead of the torsion coil spring (7), a tension spring, a compression spring, or the like can also be used. Further, the nut (g) shown in Fig. 1 is connected to the wire (3) so as not to rotate, and serves as the first member, and the rod (4) is rotatably connected to the carrier (end), so that it can be used as the second member. good. In that case, the nut (g) may be provided at the tip of a vibrator or the like having an internal space capable of accommodating the rod (4), for example.

In addition, in the device shown in Fig. 1, when the clutch pedal (31), which is the operating means, is in the return position, the nut (g
) is not restricted from rotating, but it may be configured such that, for example, it is locked or released only when it is slightly moved away from the return position, and locked again when it returns to the return position.

Such a mechanism is such that, for example, when the nut (g) moves to the right end in the drawing, the other surface (16b) of the flange portion 0υ
The nut (g) may be configured so that the nut (g) comes into strong contact with the cap (10b), etc., and the rotation of the nut (g) is stopped by the frictional force therebetween.

According to this configuration, immediately before the clutch pedal (31) and the like return to the return position, and immediately after leaving the return position,
The nut (g) is free to rotate only while it moves from one end to the other within the carrier 00), and during this time the tension adjustment effect of the wire (3) as described above is performed.

At other times, including when the clutch pedal (31) is in the return position, the relative positions of the nut (g) and the rod (4) remain unchanged.

In such a device, the first member such as the rod and the second member such as the nut are locked when the operating means such as the clutch pedal is returned to its original position, so it is necessary to use an adjustment spring with a large spring force. This has the advantage that the clutch can be attached and detached more smoothly.

Further, since the first member and the second member are locked after the operating means such as the clutch pedal is returned, the return spring force of the clutch is offset by the return spring force of the clutch pedal. This has the advantage of not putting any extra load on the clutch return spring.

〔Effect of the invention〕

When employing the mechanism of the present invention, not only permanent elongation of the wire but also excessive tension is automatically resolved. Moreover, since the wire tension is adjusted every time the operating means is operated, the wire is always under an appropriate tension. In addition, since the engagement and disengagement between the wire and the operating means is performed indirectly by restraining and releasing the rotation of a nut that is constantly screwed into a male screw with a loose pitch angle, the engagement and disengagement action is extremely smooth. Moreover, the tension of the wire can be adjusted steplessly.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing one embodiment of the device of the present invention, Fig.
3 is a perspective view of the device shown in FIG. 1; FIG. 4 is an enlarged cross-sectional view of important parts such as a carrier in the device shown in FIG. 1; FIG. 5 is an enlarged sectional view of a main part showing the operation state of the carrier etc. shown in FIG. 4, and FIG. 6 is an explanatory diagram showing the operation state of the clutch operating device equipped with the device shown in FIG. 1. (Main symbols in the drawings) (3): Wire (4) Two rods (5): Male thread (7): Torsion coil spring (8): Female thread (g): Nut GO): Carrier n: Stroke patent applicant Japan Cable System Diagram 73 Carrier Diagram 4 A Carrier Diagram 75

Claims (1)

[Scope of Claims] 1. Tension adjustment interposed between an operating wire whose one end is connected to a reciprocating driven member that is always urged in the return direction by a return spring and an operating means for the wire. The device includes: (a) a first member connected to the other end of the wire so as not to rotate about its own axis, and having a first thread concentric with the wire and having a gentle pitch angle; (b) a second member that is fitted into the first member and has a second screw that engages with the first screw; (c) a second member that rotatably supports the second member and is connected to the operating means; (d) an adjustment spring for biasing the first member in the direction of wire pull, at least when the operating means is in the vicinity of the return position; (e) when the operating means is in the return position; allowing the second member to rotate freely when in position;
When the operating means is away from the return position, the second
An operating wire tension adjustment device having a rotation lock mechanism for restraining rotation of a member. 2. A patent claim in which the first member is a rod having a male thread with a loose pitch angle formed around the rod, and the second member is a nut having a female thread formed on its inner periphery to engage with the male thread. The device according to item 1. 3. The rotation locking mechanism includes: (f) a holding means for holding the second member movably in the axial direction with respect to the carrier; and (g) abutment against each other when the operating means is away from the return position. (h) when the operating means is in the return position, the friction surfaces are rotatably brought into contact with the second member to release the contact between the friction surfaces; 2. The device according to claim 1, comprising a stopper for. 4. The device according to claim 3, wherein the friction surface is a tapered surface. 5. The device according to claim 1, wherein the first screw and the second screw are multi-thread screws.