JPH08169249A - Drive device for clutch operation cable - Google Patents

Abstract

PURPOSE: To eliminate over-tension acting on a cable and prevent the occurrence of a change in operation variables due to cable elongation, regarding a cable drive device for remotely operating a clutch. CONSTITUTION: A linearly traveling slider 7 is coupled to a motor 2 having a reduction gear via an arm 5 and a rod 6, and a tension spring 11 is laid in series between the slider 7 and a wire cable B. According to this construction, over-tension acting on the cable B or a play due to cable elongation is absorbed by the spring 11. Thus, the diameter of the cable B can be reduced and stable cable operation variables can be maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for driving a cable for remotely operating a clutch.

[0002]

2. Description of the Related Art When a clutch is mounted between a wheel drive shaft and a differential of a four-wheel drive vehicle and the clutch is actuated to switch between transmission and interruption of torque to and from the wheel while the vehicle is traveling, the clutch and the vehicle are transferred. A structure is adopted in which the clutch connection is switched by remote operation of the wire cable by connecting the and.

Conventionally, such a wire cable has been driven by a method in which an actuator using a cylinder, a motor or the like is directly connected to the end portion of the cable, and the cable is pulled in or loosened by the actuator. There is.

[0004]

However, in the method of directly pulling the wire cable by the actuator,
There is a problem in that the wire cable is likely to be overtensioned, and in order to cope with the overtension, the cable diameter must be made thicker than necessary so that the cable is not cut, resulting in an increase in weight and cost.

Further, when the wire cable is permanently stretched due to a change with time, the amount of operation of the cable is changed by the extension, and there is a problem that switching of the operation of the clutch is likely to be disturbed.

In particular, when a highly accurate operation is required for switching the clutch, the extension of the wire cable causes a malfunction.

Therefore, the present invention solves the above problems and provides a cable drive device in which overtension does not occur in the cable and the clutch can be reliably operated even by extension of the cable. Has an aim.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to a motor with a reduction gear, a slider for reciprocating linearly with the rotation of the motor, and a cable for connecting the slider and the clutch. Are connected to the cable via an elastic member connected in series, and the elastic member is configured to apply tension to the slider and the cable in the moving direction.

In the above structure, the cable is
When a return spring that pulls it back to the clutch side is attached, the tension of the elastic member is set higher than the tension of the return spring.

[0010]

As described above, by interposing an elastic member that generates a pulling force in series between the slider attached to the motor and the cable, the elastic member buffers the excessive tension applied to the cable, and the cable is overloaded. Protect from load.

Further, even if the cable is stretched, the elastic member absorbs the play due to the stretch, so that the clutch can be operated reliably.

[0012]

1 and 2 show a drive device for a remote control cable according to an embodiment. In this drive unit A, a motor 2 with a speed reducer is attached to the bottom surface of a case 1, and an arm 5 is attached to an output shaft 4 of the speed reducer 3 while the arm 5 is not rotating.

The speed reducer-equipped motor 2 is constructed, for example, by forming a worm gear on a motor shaft connected to a rotor and engaging a drive gear connected to the output shaft 4 of the speed reducer 3 with the worm gear. By stopping the drive gear, the rotational movement of the motor is arbitrarily controlled.

One end of a rod 6 is rotatably connected to the tip of the arm 5, and a slider 7 is rotatably connected to the other end of the rod 6.

A guide plate 8 having a linear guide groove 9 is attached to the bottom surface of the case 1, and the guide groove 9
A guide portion 7a provided at one end of the slider 7 is slidably fitted therein.

The guide groove 9 is formed linearly on a line connecting the cable insertion hole 10 provided in the case 1 and the output shaft 4 of the speed reducer 3, and the arm 5 is driven by the motor 2 with the speed reducer. When rotated, the slider 7 linearly moves by the guide of the guide groove 9 and reciprocates toward the cable insertion hole 10.

One end of a tension spring 11 made of a coil spring is connected to the tip of the slider 7, and the other end of the tension spring 11 is connected to a wire cable B drawn from the cable insertion hole 10 into the case 1. ing.

This tension spring 11 is a wire cable B
And the slider 7 are directly connected to each other, and a tensile force in the moving direction is applied to the cable B and the slider 7.

The other end of the wire cable B (not shown) is connected to the clutch.
When a return spring for pulling back the cable toward the clutch side is attached to, the tension of the tension spring 11 is set to be larger than the tension of the return spring.

In the driving apparatus A of the embodiment constructed as described above, as shown in FIGS. 1 and 2, the arm 5 and the rod 6 connected to the speed reducer 3 are connected to the tension spring 11 and the wire cable B. The motor 2 is controlled so that the rotation of the output shaft 4 of the speed reducer 3 is stopped when it comes to the 180-degree opposite position lined up on a straight line. Reciprocating, wire cable B
Set to pull in or loosen.

That is, the speed reducer 3 turns the motor 2 to 1
The rotation radius of the arm 5 is 2 for each rotation of 80 degrees.
It is set so that the wire cable B reciprocates in the length direction with a double stroke to switch the operation of the clutch.

In this case, since the wire cable B is pulled in via the tension spring 11, the over tension acting on the wire cable B is absorbed by the tension spring 11. Therefore, it is not necessary to make the wire cable B thicker than necessary, and the weight of the cable and the manufacturing cost can be reduced.

Further, even if the wire cable B is permanently stretched due to a change with time or the like, the tension spring 11 absorbs the play due to the extension, so that the operation amount of the cable with respect to the clutch can be stably maintained. it can.

FIGS. 3 and 4 show an example in which the above-described wire cable driving device A is used for remote operation of the clutches E, E mounted between the shaft C and the differential D of a four-wheel drive vehicle. .

As shown in FIGS. 4 to 8, the clutch E is provided between the outer ring 21 connected to the front wheel C through the constant velocity joint F and the inner ring 22 connected to the front differential D. Rotating in the direction, the inner and outer rings 21, 22
A plurality of sprags 23 engaged with the sprags 23, and a retainer 24 and a movable retainer 2 for fixing the inner spur 23 for holding the sprags 23.
5, the movable cage 25 and the cage 25 and the outer ring 2 are provided.
A coupling means 26 for detachably coupling the 1 is provided.

The coupling means 26 is attached to a slidable operating member 27 which is connected to the wire cable B, and is attached to the movable retainer 2.
The connector 28 that moves in the axial direction while being prevented from rotating by 5.
And a meshing member 29 that meshes with the connector 28 is attached to the inner diameter surface of the outer ring 21, and the wire cable B is pulled back to the clutch side on the operating member 27 (that is, the connector 28).
A return spring 30 that urges the engaging member 29 in the direction in which the engaging member 29 engages is incorporated.

Further, a switch spring 31 which gives a rotational force in one direction to the movable retainer 25 is attached between the movable retainer 25 and the fixed retainer 24, and both retainers 2 are attached by the spring force.
The relative rotation of 4 and 25 causes the sprag 23 to tilt to the engagement operating position.

Further, a spline shaft 32 connected to the inner ring 22 is fitted with a spindle 33 connected to a stationary system of the vehicle, and a cable passage 34 for guiding the wire cable B to the outside of the clutch with a gentle curvature is fitted to the spindle 33. The wire cable B drawn out through the passage 34 is connected to the drive unit A.

As shown in FIG. 3, the drive unit A of this embodiment is arranged in a transfer or the like in the engine room G, and the movement of the motor 2 is controlled by operating a lever or the like provided in the driver's seat. Install.

In this case, the spring force of the return spring 30 incorporated in the coupling means 26 may be equal to or more than the sum of the force for sliding the operating member 27 and the sliding resistance of the wire cable B, and a relatively small value. However, the tension spring 1 of the drive unit A is compared with the spring force of the return spring 30.
Set so that the spring force of 1 becomes large.

As a result, when the motor 2 with reduction gear retracts the wire cable B through the tension spring 11 as shown in FIG. 1, the connector 28 and the meshing member 29 are separated from each other in the coupling means 26 as shown in FIG. The outer ring 21 and the movable cage 25 are separated. On the contrary, when the motor 2 loosens the wire cable B as shown in FIG. 2, the wire cable B is pulled back by the spring force of the return spring 30 and the connector 28 and the meshing member 29 mesh with each other as shown in FIG. 21 and movable cage 25
And are combined together.

In the remote control structure for a four-wheel drive vehicle configured as described above, when the transfer is set to the two-wheel drive mode and the vehicle travels forward with the outer wheel 21 and the movable retainer 25 separated, Due to the action, the movable retainer 25 rotates relative to the fixed retainer 24, the sprag 23 tilts in the opposite direction to the rotation direction of the inner ring 22, and moves to the engagement operation position on the vehicle forward side.

At this time, when the outer ring 21 is rotating at a rotation speed equal to or higher than that of the inner ring 22, the sprag 23
Is in a free running state, torque is not transmitted from the driven side, and the drive system from the outer ring 21 to the constant velocity joint F to the wheels is stopped.

When the transfer is switched to the four-wheel drive mode, torque is transmitted from the inner ring 22 to the outer ring 21. In this case as well, the outer ring 21 is replaced by the inner ring 22.
On the other hand, the outer ring 21 is in a free running state with respect to the sprag 23 in a state in which the outer ring 21 is rotating at a rotation speed equal to or higher than the above.

From the above state, when the wire cable B is operated by the drive unit A and the outer ring 21 and the movable retainer 25 are connected by the connecting means 26, the outer ring 21 rotates so that the inner ring 2 rotates.
When the number of rotations exceeds 2, that is, when the so-called engine brake is applied, the rotation of the outer ring 21 forcibly rotates the movable retainer 25 in the direction opposite to the acting direction of the switch spring 31. For this reason, the sprag 23 tilts in the direction in which torque is transmitted from the outer ring 21 to the inner ring 22, and torque is transmitted from the driven side, so that engine braking is effective.

[0036]

As described above, according to the present invention, since the elastic member for generating a tensile force is provided in series between the motor and the cable, it is possible to prevent the cable from being overtensioned. It is possible to improve the operability of the cable and reduce the cost without increasing the thickness.

Further, since the elastic member absorbs the play due to the extension of the cable and the like, the operation amount of the clutch by the cable can be kept constant, and the precise control of the cable by the motor is not necessary, so that the cable is stable for a long period of time. The operating state can be maintained.

[Brief description of drawings]

FIG. 1A is a cross-sectional plan view showing a drive device of an embodiment, and FIG. 1B is a vertical sectional front view thereof.

FIG. 2 (a): a cross-sectional plan view showing an operating state of the drive device of the above, (b): a vertical sectional front view thereof.

FIG. 3 is a diagram showing a remote control structure using a drive device.

FIG. 4 is a sectional view showing a driving force transmission structure of a four-wheel drive vehicle.

FIG. 5 is a vertical sectional front view showing the internal structure of the clutch.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a sectional view showing an operating state of a coupling means in the clutch.

[Explanation of symbols]

 1 Case 2 Motor 3 Reducer 4 Output shaft 5 Arm 6 Rod 7 Slider 8 Guide plate 9 Guide groove 10 Cable insertion hole 11 Tension spring 21 Outer ring 22 Inner ring 23 Sprag 24 Fixed cage 25 Movable cage 26 Coupling means 30 Return spring 31 Switch spring A Drive device B Wire cable E Clutch

Claims (2)

[Claims] 1. A motor with a reduction gear is provided with a slider that reciprocates linearly as the motor rotates, and the slider and a cable connected to a clutch are connected via an elastic member connected in series to the cable, A drive device for a clutch operating cable, wherein the elastic member applies tension to the slider and the cable in the moving direction thereof. 2. The clutch operating cable according to claim 1, wherein a return spring for returning the cable to the clutch side is attached to the cable, and the tension of the elastic member is set to be larger than the tension of the return spring. Drive.