JPS63297819A - Coupling device for rotary shaft - Google Patents

Abstract

PURPOSE:To enable a shaft to be firmly tightened by decreasing a slit width to be narrowed, by providing a protruding part in a hollow coupling member and screwing each nut to be tightened toward the protruding part. CONSTITUTION:A hole 28 is formed penetrating in the lengthwise direction through a coupling member 10. And in the periphery of the coupling member 10, it is equipped in the lengthwise direction central part with an annular protruding part 12 rising to the outer direction. The coupling member 10 inserts each screwable nut N1, N2 to be screwed to each end part 30, 32 next rotary shafts S1, S2 into the hole 28 finally screws the nut N1 and N2 to be tightened toward the protruding part 12. Accordingly, each rotary shaft S2, S2, which is pressed and held to the coupling member 10 from its periphery by decreasing a width of each slit 18, 20 to be narrowed completing the connection, can be firmly tightened.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a coupling device for coupling two rotating shafts.

Therefore, it can be used, for example, to connect the motor shaft of a servo motor and the shaft of a detector.

[Conventional technology]

Conventionally, in coupling rotating shafts, especially for small-diameter shafts such as the motor shaft of a servo motor and the shaft of a detector, or as a shaft joint with a small torque load, each of the two shafts is housed in a joint member, and each Some shafts are connected by using a screw member that passes through the joint member from the radial direction of the shaft, and pressing the tip of the screw member against the outer circumferential surface of each shaft. In addition, the outer periphery of the end of one shaft is cut into a tapered shape, and the inside of the end of the other shaft is cut and drilled at the same angle of inclination so that it comes into close contact with the tapered end. There is also a taper bonding method in which they are bonded to each other through the holes.

[Problem that the invention seeks to solve]

However, with the above connection method of pressing the tip of the screw member, if used for a long time, the tip of the screw member may wear out or deform, which may cause minute play when the shaft rotates. A precise detector will have a large measurement error. In the case of the latter taper joint, high-precision machining is required to form the tapered shape of both wheels, resulting in a joint that is expensive to manufacture.

SUMMARY OF THE INVENTION Therefore, in order to solve these problems, it is an object of the present invention to provide a rotary shaft coupling device that is highly reliable, can withstand long-term use, is easy to manufacture, and is inexpensive.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a joint device for a rotating shaft, which includes a hollow joint member having a protrusion extending outwardly in the longitudinal center portion of the joint member; a pickpocket extending from the part to each of the raised parts;
Provided is a coupling device for a rotating shaft, characterized in that the coupling member has threaded portions provided near the bases on both sides of the raised portion, and is formed by combining the coupling member and a nut member that can be screwed into the threaded portion. .

[For production]

The joint is assembled by inserting (screwing) nuts into each end of the hollow joint member, then inserting the rotating shaft to be connected into the hollow hole from both ends of the joint member, and then tightening each nut toward the protrusion. The width of the slit provided in the member is sandwiched, and as a result, each shaft can be fastened.

〔Example〕

The present invention will be described in more detail below based on embodiments shown in the accompanying drawings. Referring to FIG. 1, which is shown in a perspective view with two rotating shafts SL and S2 to which the rotating shaft coupling device is to be coupled, a hole 28 is formed through the coupling member 10 in the longitudinal direction. On the outer periphery of the joint member 10, an annular raised portion 12 is formed at the longitudinally central portion of the joint member 10.
In this embodiment, each has inclined surfaces 24 and 26 whose height decreases as the distance from the ridge line 22 is at the center. This joint member 1
Threaded portions 14 and 16 are provided on the outer circumferential surface of the raised portion 12 from each end 30 and 32 of the raised portion 12 to the vicinity of the root thereof. The threaded portions 14 and 16 do not actually need to be provided from the ends 30 and 32, but may be provided from a position halfway toward the raised portion 12. Furthermore, the above-mentioned vicinity of the root includes the case before reaching each of the slopes 24 and 26 of the raised portion 12, and also the case where it slightly enters and enters each of the slopes 24 and 26. Just choose. Furthermore, the coupling member 10 is provided with slits 18 , 20 extending from each end 30 , 32 to the raised portion 12 . In this embodiment, each slit 18.degree. 20 reaches the ridgeline 22 of the raised portion 12, and further reaches the inclined surfaces 26, 24 on the other side. Where the slits 18 and 20 terminate on the raised portion 12 depends on the elastic force of the joint member 10, which is determined by the material and shape of the joint member 10. The number of slits 18.degree. 20 to be provided also depends on the elastic force.

However, since they are used as joints for rotating shafts, it is preferable to arrange them at equal angles to maintain symmetry.

In this embodiment, two slits I-18 and 20 are formed, and four slits are alternately extended from each end 30 or 32 so that the slits are spaced apart from each other by 90 degrees. It is arranged at an angle.

The screwable nuts Nl and N2 are screwed into the respective ends 30 and 32 of the joint member 10 having the above configuration, and then the rotating shafts 31 (for example, the drive shaft) and 32 (for example, the driven shaft) are inserted into the holes. 2
8, and finally insert Nara l-N1 and N2 into the raised part 1.
2, each slit 18, 20
As the width becomes narrower, each rotating shaft Sl, S2 is pressed and held by the joint member 10 from the periphery, and the connection is completed. Each nut Nl, N2 may have a double nut structure.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to provide a rotary shaft coupling device that is highly reliable, easy to manufacture, and low cost.

41 Description of the Drawings FIG. 1 is a perspective view showing a rotary shaft coupling device according to the present invention together with two rotary shafts.

10...Joint member, 12...Protuberance, 14
, 16... Threaded portion, 18, 20... Slit, 22... Ridge line, 24, 26...
Inclined surface, 28... hole, 30, 32...
・End, Nl, N2... Nut, St, 32...
Axis of rotation.

Claims (1)

[Scope of Claims] 1. A joint device for a rotating shaft, which includes a hollow joint member having a raised portion extending outwardly in the longitudinal center of the joint member, and a raised portion extending outward from each end of the joint member. Each of the joint members has a slit extending up to the raised portion, and threaded portions provided near the bases on both sides of the raised portion of the joint member, and the joint member is connected to a nut member that can be screwed into the threaded portion. Combination rotating shaft coupling device. 2. The rotating shaft coupling device according to claim 1, wherein the slits provided on both sides of the raised portion are arranged alternately around the coupling member and arranged at equal angles to each other. 3. The rotating shaft coupling device according to claim 1 or 2, wherein the raised portion is annular.