JPH05180235A - Shaft coupling mechanism - Google Patents

Abstract

PURPOSE:To prevent the damage of an equipment to be driven by facilitating the detaching of a shaft jointing member which transfers rotation torque and preventing the rotation of a shaft when transferring torque is applied. CONSTITUTION:A part of the head of an output shaft 1 is notched, and a sleeve 2 fitting to a fitting diameter is positioned, and a spring 3 is installed so as to hold the sleeve 2 from the outer periphery. This constitution binds the shafts transmitted by the spring back of the spring 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft joint structure for transmitting rotary motion.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view showing a conventional structure.
In the figure, the output shaft 1 has a tapered portion at the tip end and is coupled with the taper of the retainer 2a, and the inner diameter is coupled with the spline shaft of the potentiometer 4 by the spline teeth to transmit rotation and move freely in the axial direction. You can The spring 3 having extension energy is fixed to the end surface of the potentiometer 4 via the spacer 8. The potentiometer 4 is attached to the housing 7 by a clamp 5 and a screw 6. By loosening the tightening torque of the screw 6, the case portion of the potentiometer 4 can be freely rotated within the rotatable range of the potentiometer shaft.

Next, the operation will be described. Drive motor,
The rotation of the output shaft 1 is transmitted via a reduction gear portion and a rotation angle control limit switch mechanism (neither is shown). At that time, the shaft of the potentiometer 4 is rotated and adjusted to a position near the zero reference (minimum output resistance) of the potentiometer 4 in accordance with the rotation angle reference of the output shaft 1, and then the spacer 8, the spring 3, and the retainer 2a are adjusted to the shaft portion of the potentiometer 4. Then, the taper of the retainer 2a is attached to the taper portion of the shaft end portion of the output shaft 1. Then, the case portion of the potentiometer 4 is inserted into the mounting seat of the housing 7, and the case portion of the potentiometer is finely manually rotated so that the rotation angle reference of the output shaft 1 and the reference of the potentiometer 4 are perfectly matched, and the clamp 5 , The rotation of the output shaft 1 is transmitted to the serration of the potentiometer 4 via the taper clutch portion by firmly mounting it on the housing 7 with the screw 6, and the potentiometer is detected.

[0004]

The conventional shaft coupling mechanism is composed of two portions, a serration portion and a taper clutch portion, and it takes a long time to assemble. Also, the joint backlash of the serration part directly affects the output value of the potentiometer and causes an error in the output shaft angle, and the final joint between the potentiometer and the output shaft 1 is a tapered surface for precision machining of each part (position accuracy, machining accuracy). ) Was required and processing time was slowed down. In particular, the shaft portion of the pontentiometer requires special specifications for serrations, which poses a problem of high price.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a shaft coupling device in which the transmission mechanism of the coupling portion is provided in one place and the straight shaft of the potentiometer can eliminate the coupling play and transmit the rotation. And

[0006]

A shaft coupling mechanism according to the present invention comprises a cylindrical clutch composed of a movable sleeve capable of holding a straight shaft and a spring made of an elastic material which gives a holding force to the sleeve. is there. In addition, the unit can be easily attached and detached by integrating the components on one side of the drive shaft.

[0007]

The elastic spring according to the present invention is
Holds the tightening force, and when a rotational force more than a predetermined holding force acts, it overcomes the holding force of the spring and causes a minute spread, and the inner diameter of the sleeve that forms the fitting diameter with the mating shaft diameter is restricted. The force is released and transmission from the drive shaft is blocked.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. The same reference numerals in FIG. 1 and FIG. 2 indicate the parts corresponding to those in FIG. 4, and the paragraph and the cutout are arranged in the shaft coupling portion of the potentiometer 4 of the output shaft 1, and the sleeve 2 is inserted in the cutout. .. The sleeve 2 is a semi-circular cylindrical ring that matches the remaining semi-circle of the output shaft 1, and uses phosphor bronze as a sliding material. The spring 3 is a ring-shaped spring formed of an elastic metal material, and the outer end of the sleeve 2 is inserted by inserting it from the upper end of the output shaft 1 by pushing the tip and opening it outward using a bending jig or the like. The sleeve 2 and the spring 3 are fixed by a spring back, and the axial movement of the sleeve 2 and the spring 3 is prevented by an upper retainer 1b and a lower retainer 1 by the paragraph of the output shaft 1.
The vertical stopper is attached at c.

Next, the operation will be described. In the output shaft 1 portion of the device, as shown in FIG. 2C, the sleeve 2 is initially set in a free state between the cutout portion of the output shaft 1 and the inner diameter of the spring 3. When the straight shaft of the potentiometer 4 is inserted from the output shaft guide portion 1a, the sleeve 2 moves to the inner diameter of the spring 3 as shown in FIG. Works. The elastic force of the spring 3 acts on the inner diameter of the sleeve 2 and the semicircular portion of the output shaft to fix the straight shaft of the potentiometer 4 as a surface holding force. If this surface holding force is made smaller than the impact torque of the internal mechanical stopper of the potentiometer 4, even if it collides with the mechanical stopper, the joint portion of the shaft of the potentiometer 4 and the output shaft 1 will slip and prevent rotation. It is possible to protect expensive potentiometers.

Embodiment 2. In the above-mentioned embodiment, the attaching / detaching mechanism is integrated on the drive shaft side, but the same effect can be obtained even on the driven side (control device side), and the joint has the transmission torque control mechanism. Further, the sizes of the sleeve 2 and the spring 3, the material, the plate thickness, and the like may be changed as necessary depending on the magnitude of the transmission torque. As shown in FIG. 3, it is also possible to connect without directly using the sleeve 2 by providing a notch in the fitting diameter portion and providing a spring portion. FIG. 3 (a) shows an embodiment in which a close contact coil spring 3a is fixed by a retaining ring 8. FIG. 3 (b) shows a clip spring 3b using a steel wire for spring that enables connection with a relatively small transmission torque. Example. FIG. 3C shows an embodiment in which the holding force can be adjusted, and the spring 3c is attached to the bolt 9 and the lock nut 10.
There is an advantage that fine adjustment is possible by adjusting the tightening of and the molding of the spring back of the spring 3c is acceptable to some extent.

[0011]

As described above, according to the present invention, since the spring is directly formed in the shaft coupling portion to form a unit, the coupling and dismounting are facilitated, and the coupling shaft is provided with a special anti-rotation process (serration). , Flat knurls, splines) are not required, the apparatus can be made inexpensive, and a joint with high detection accuracy can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a joint device according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a joint portion according to the present invention, where (a) is a front sectional view, (b) and (c) are sectional views taken along the line AA of (a), and (d) is a state at the time of mounting. It is a front view shown.

FIG. 3 is a block diagram of a joint portion showing another embodiment of the present invention, FIG. 3 (a) is an embodiment of a coil spring, FIG. 3 (b) is an embodiment of a steel wire spring, and FIG. It is a figure which shows the Example which enables adjustment.

FIG. 4 is a cross-sectional view showing a conventional joint device.

[Explanation of symbols]

 1 Output shaft 2 Sleeve 3 Spring 4 Potentiometer

Claims (1)

[Claims] 1. A rotation-transmitting joint part is formed of elastic metal into a ring shape and is provided with a spring having a tightening force, and a spring for holding a coupling part by the spring, and the other torque shaft is inserted. In a joint device for transmitting torque, a shaft joint mechanism is characterized in that joint fastening components are integrated and integrated on the drive side.