JPS62255618A - Simplified shaft coupling - Google Patents

Abstract

PURPOSE:To enable torque to be smoothly transmitted by surrounding the side surface of a laminated spring with a coil spring, and making act just as an universal joint by the flexibility of the laminated leaf springs and coil spring. CONSTITUTION:Into the interior of slits 14, 15, laminated leaf springs 16 which are composed of a suitable number of thin leaf springs laminated each of which has a breadth nearly equal to the diameter of an output shaft 2 are inserted, and a coil spring 17 common to shaft end parts 12, 13 is externally fitted so as to surround the laminated spring 16. The laminated leaf springs 16 transmits torque by the twist elastic force thereof, and the coil spring 17 prevents the laminated spring 16 from getting out from the slits 14, 15. Accordingly, even if an offset exists to some degree between a motor shaft 2 and a worm shaft 5 or between these shafts 2, 5 and the coil spring 17, it is absorbed by the flexibility of the laminated leaf springs 16 and coil spring 17 and the transmission of torque can be smoothly carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a shaft coupling that has a relatively small transmission torque and is simple in structure and easy to attach and detach from the shaft end.

Conventional technology Most conventional shaft joints connect flanges fixed to the shaft end using bolts, rubber, etc., or meshingly connect them with gears, chains, etc., making the structure, processing, mounting, and removal difficult. Therefore, it was unsuitable for applications where the transmitted torque is relatively small.

Problems to be Solved by the Invention The present invention has a structure that is suitable for applications where the transmitted l and torque are relatively small, and is easy to install and remove, so that even if the alignment between the shafts is somewhat imperfect, it will not interfere with torque transmission. The purpose of the present invention is to provide a simple shaft joint that does not require any additional equipment and is inexpensive.

Means for Solving the Problems The present invention involves inserting each half of a stacked leaf spring for torque transmission into a slit formed along the axis at the end of the shaft where the end surfaces of the two shafts face each other with a small gap. However, it is characterized in that the sides of the stacked slope spring are surrounded by a common coil spring that fits into both shaft ends.

Function: The stacked leaf springs are locked in the slits of the two shafts to transmit torque by torsional elastic force, and the coil springs are tightly attached to the shaft ends to prevent the stacked leaf springs from escaping laterally from the slits.

Since stacked slope springs and coil springs can be installed and removed in the axial direction,
It is possible to connect both shafts by attaching a stacked leaf spring and a coil spring to one shaft end, and then pushing the other shaft end into the coil spring and inserting the stacked leaf spring into the slit. . In this case, since the stacked leaf spring and the coil spring are flexible, it is not necessary to hold both shafts in a straight line during the connection process, and even if the shaft center is bent slightly, the stacked spring and coil spring The flexibility of the spring acts like a universal joint to smoothly transmit torque.

Embodiment The figure shows an embodiment in which torque is transmitted from the output shaft 2 of a small motor 1 to the worm shaft 5 of a worm reducer 4 by means of the shaft joint 3 of the present invention. The worm shaft 5 is supported in a case 6 of the reducer 4 by a bearing 7.7, and a motor-side mounting plate 8 is bolted to the case 6 so that the worm shaft 5 and the output shaft 2 are concentrically opposed to each other. The output shaft 2 and the worm shaft 5 have the same diameter, and there is a small gap 11 between both ends 9 and 10, and there are grooves of equal width and approximately equal length formed with cuts along the axis at both shaft ends 12 and 13. Surin) has a value of 14.15.

A stacked leaf spring 16 formed by stacking an appropriate number of thin slope springs with a width approximately equal to the diameter of the output shaft 2 in the slit 14.15.
is inserted, and a common coil spring 17 is fitted onto the shaft ends 12 and 13 to surround the stacked slope spring 16.

The stacked leaf spring 16 transmits torque by its torsional elastic force, and the coil spring 17 has a positive slope spring 16 which is connected to the slit 14.1.
Prevent escape from 5. Therefore, even if there is some misalignment between the motor shaft 2 and the worm shaft 5 or between these shafts 2.5 and the coil spring 17, the flexibility of the stacked leaf spring 16 and the coil spring 17 will be affected. It is absorbed and does not interfere with torque transmission.

To connect the output shaft 2 to the worm shaft 5, connect the worm shaft 5
One half of the stacked slope spring 16 and one half of the coil spring 17 are inserted in advance into the spring 16. l'? If the output shaft 2 is pushed toward the worm shaft 5 so that it is inserted into the output shaft 2, both shaft ends 12.13 will be guided to a substantially concentric position by the springs 16.17, and the mounting Fj will be installed at that position. , 8 to the case 6 with bolts.

Since the stacked leaf spring 16 is made by stacking thin leaf springs, it has high flexibility in relation to the torque transmission force, and is resistant to fatigue caused by alternating bending stress caused by misalignment.The coil spring 17 also resists alternating strain due to misalignment. However, since the coil spring 17 does not contribute to torque transmission, it is easy to design it to be resistant to fatigue, and therefore both springs 16 and 17 have a long service life.

Effects of the Invention The present invention has the above configuration, is simple in structure and small in size, has the effect of being convenient for film deposition as a flexible shaft joint, and is suitable for applications where torque is relatively small.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view of an embodiment of the present invention. 2.5...axis

Claims (1)

[Claims] Each half of the stacked leaf spring for torque transmission is inserted into a slit formed along the axis center in the shaft end where the end surfaces of the two shafts face each other with a small gap, and a common common leaf spring that is fitted to both shaft ends is inserted. A simple shaft joint made by surrounding the sides of a stacked leaf spring with a coil spring.