JPH0454341Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention fixes a rotating body such as a precision gear or coupling to the rotating shaft of an ultra-small motor of 50W or less used in office equipment, precision equipment, etc. The present invention relates to a device for fastening a rotating body to a rotating shaft, which is suitable for cases in which the rotating body is fastened to a rotating shaft.

BACKGROUND ART FIG. 3 shows a conventional example of a rotating body fastening device to a rotating shaft of the above-mentioned ultra-small motor, etc., in which 11 is a rotary body boss, 12 is a shaft hole, and 13 is a rotary body fastening device perpendicular to the shaft hole 12. This is a bottomed hole with one end open that is eccentrically drilled, and a small diameter hole 15 is inserted between the notch 14 provided in the boss portion 11 and the bottomed hole 13 at a position substantially concentric with the hole 13.
and concentrically. A cylindrical stopper 16 is slidably fitted into the hole 13, and a screw 17 formed at one end thereof projects from the small diameter hole 15 into the notch 14.
The stopper 16 is provided with an arcuate notch 18 that is concentric with the shaft hole 12 and has the same radius. 19 is Wasiya,
20 is Natsu. The fastening device having the above structure fixes the boss portion 11 to the rotating shaft by inserting the rotating shaft into the shaft hole 12, then tightening the nut 20 and strongly pulling the stopper 16 upward in the figure.

This fastening device has the advantages of not requiring machining such as flattening the rotating shaft and of not providing a space for fastening in the axial direction, but it has the following disadvantages in use and manufacturing. be.

(1) The shaft hole 12 usually has a small diameter, and the fit tolerance for the rotating shaft inserted through it is also quite small.
During the insertion, it is necessary to match the surface shape of the notch 18 with the inner surface of the shaft hole 12 with sufficient accuracy, but for this purpose, the longitudinal position and angular position of the stopper 16 can be adjusted only by tightening the nut 20. It is not easy to accurately adjust and hold both, and it is difficult to insert the rotating shaft.

(2) Machining of the notch 18 is done separately from the shaft hole 12, so machining is troublesome, and the user side
It is difficult to enlarge or change the inner diameter of the Therefore, it is necessary to always have various types of fastening devices with different shaft hole diameters available depending on demand, which is uneconomical.

Problems to be Solved by the Invention The purpose of the present invention is to improve the stopper support structure of the conventional device and to propose a fastening device that allows easy insertion of the rotating shaft and enlargement of the shaft hole on the user side.

Means for Solving the Problems In the present invention, a stopper is slidably fitted into a hole bored eccentrically and perpendicular to the shaft hole in the boss of the rotor having a shaft hole, and is fixed to the boss of the rotor. The gist is a structure of a device for fastening a rotating body to a rotating shaft, in which both ends of the stopper are tightened and fixed by twisting the metal in the axial direction, and the stopper has an arcuate notch that is concentric with the shaft hole and has the same radius. do.

Function: With the stopper in the present invention fixed by screws at both ends at a position where the surface of the notch matches the inner surface of the shaft hole, the rotating shaft is inserted into the shaft hole. Next, when one screw is removed and the other screw is tightened, the cut portion comes into pressure contact with the outer surface of the rotating shaft, and the rotating body boss portion is strongly fastened to the rotating shaft.

If the stopper is fixed to the boss of the rotating body using the screws at both ends with the notch surface aligned with the inner surface of the shaft hole, the shaft hole and notch can be simultaneously drilled or reamed in this state to adjust the shaft hole inner diameter. can be enlarged and changed.

Embodiment FIGS. 1 and 2 show an embodiment in which the present invention is applied to a bellows type shaft joint. A shaft hole 3 is bored in the center of the rotating body boss portion 2 connected to both ends of the bellows 1, respectively.
A hole 4 is bored in the boss portion 2, perpendicular to the axis of the shaft hole 3 and eccentric from the axis by a dimension l smaller than the radius of the shaft hole 3. A threaded portion 5 with a slightly smaller diameter than the hole 4 is formed at one end of the hole 4, and a threaded portion 6 with a larger diameter than the hole 4 is formed at the other end, and after the stopper 7 is tightly fitted into the hole 4, the screw is screwed. A round machine screw 8 is screwed into the part 5, and a set screw 9 is screwed into the threaded part 6 to fix the stopper 7.
In this fixed state, the stopper 7 and the threaded portion 5 are slightly apart in the axial direction, and the stopper 7 protrudes into the threaded portion 6 by that amount. In the fixed state, an arcuate notch 10 is cut into the stopper 7 so as to coincide with the inner surface of the shaft hole 3. When enlarging the shaft hole 3, if the notch 10 is also cut at the same time, the surface of the notch 10 can always be aligned with the inner surface of the shaft hole 3.

To fasten the shaft joint to a rotating shaft, the rotating shaft (not shown) is inserted into the shaft hole 3, the screw 8 is removed, and the screw 9 is tightened. When appropriate, cut section 1
0 is pressed against the rotating shaft to firmly fasten the rotating body boss portion 2 to the rotating shaft.

To remove the rotary boss portion 2 from the rotary shaft, the operation opposite to the above may be performed. The threaded portion 5 has a small diameter and is useful for preventing the stopper 7 from falling, and the threaded portion 9 has a large diameter and is effective for strongly tightening the stopper. However, for convenience of manufacturing, the threaded portion 5 may have the same diameter as the threaded portion 9.

If the diameter of the rotating shaft is slightly larger than the inner diameter of the shaft hole, by holding the stopper 7 in the fixed state and enlarging the diameter of the shaft hole 3 with a reamer or the like, the notch 10 can also be machined into the desired shape at the same time.

Effects of the invention Since the present invention has the above-mentioned configuration, both ends of the stopper can be tightened with screws to fix it to the boss of the rotating body, so it is extremely easy to fit the rotating shaft into the shaft hole with this fixed body. In addition, in the fixed state, the notch can be easily machined at the same time as the shaft hole diameter enlargement, so the user can easily machine parts such as gears that have a small rotary boss part. As a result, the manufacturer drills a pilot hole in the rotating body boss instead of the shaft hole, and the notch is also machined to match the shape of the pilot hole. If this is done, the rotating body boss portions of the same prepared hole can be kept in stock for various different shaft holes, and the amount of inventory can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is an elevational view showing a part of an embodiment of the present invention in cross section, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig.
The figure is a sectional view similar to FIG. 2 of the conventional example. 2... Rotating body boss portion, 3... Shaft hole, 4... Hole,
7... Clasp, 8, 9... Screw, 10... Arc-shaped notch.

Claims (1)

[Scope of utility model registration request] A stopper is slidably fitted into a hole bored eccentrically and at right angles to the shaft hole in a rotating body boss having a shaft hole, and a screw is screwed into the rotating body boss in the axial direction of the stopper. A device for fastening a rotating body to a rotating shaft by tightening and fixing both ends of the clasp and providing the clasp with an arcuate notch that is concentric with and has the same radius as the shaft hole.