JPH08159807A - Method of fixing rotary disk - Google Patents

Abstract

PURPOSE: To provide a method for fixing a rotary disk which has a simple structure and can reduce the cost. CONSTITUTION: In the method of fixedly fitting a rotary disk 3 having a mounting hole 31 into which a small diameter part 22 can be filled on a rotary shaft 2 having the small diameter 22 at a shaft end, the rotary disk 3 is provided with a ring part 51 and tongue parts 52 which project from at least three places at an equal interval in the circumferential direction toward the center from the inner circumference of the ring part 51, and a ring-like spring clamp 5 made of a spring steel plate in which the diameter of a circle connecting to the tip of the tongue parts 52 is made smaller than the diameter of the small diameter part 22 is provided, and after the rotary disk 3 is fitted into the small diameter part of the rotary shaft 2, the spring clamp 5 is pushed into the small diameter part 22 and the ring part 51 is brought into close contact with the rotary disk 3, and the tongue parts 52 are deformed and at the same time, the tip of the tongue parts 52 is made to eat into the periphery of the small diameter part 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing a rotary disk such as a rotary encoder or a disk motor to a rotary shaft.

[0002]

2. Description of the Related Art Conventionally, when a rotary disk is fixed to a rotary shaft, a fixed portion 1 such as a motor is used as shown in FIG.
At the end of the rotary shaft 2 via the bearing 11, a small diameter portion 22 having a predetermined length from the shaft end surface 21 is provided, and a stepped portion end surface 23 is formed. The rotary disc 3 has a mounting hole 31 provided at the center thereof inserted into the small diameter portion 22, and is axially pressed against the end surface 23 of the stepped portion by the ring-shaped hub H via the ring-shaped support plate 4, and is set by the set screw H1. H is fixed to the rotating shaft 2, and if necessary, the hub H, the rotating disk 3 and the hub H
An adhesive is applied between the rotary shaft 2 and the rotary shaft 2 to fix them.

[0003]

However, in the prior art, there are gaps between the rotary disk and the hub and between the hub and the rotary shaft, and the rotary screws are rotated during the work of tightening the set screw or applying the adhesive. The disc is tilted with respect to the hub, or the hub is tilted with respect to the rotation axis, and errors accumulate between the rotation disk and the rotation axis, and the detection element (not shown) of the rotation disk and the detector or the field of the motor. There has been a problem that a gap between a fixed part such as an iron core (not shown) cannot be sufficiently maintained. Further, it is possible to increase the processing accuracy of each part to reduce the error, but if the processing accuracy is increased, there is a problem that the cost increases. The present invention
An object of the present invention is to provide a method for fixing a rotary disc, which has a simple structure and can reduce the cost by directly fixing the rotary disc to the rotary shaft.

[0004]

In order to solve the above-mentioned problems, according to the present invention, a rotary disk having a small diameter portion at its shaft end is fitted with a rotary disk having a mounting hole capable of being fitted into the small diameter portion. In the fixing method, a ring portion and a tongue portion projecting from at least three locations at equal intervals in the circumferential direction from the inner circumference of the ring portion toward the center are provided, and the diameter of a circle connecting the tips of the tongue portions. Is provided with a spring clamp made of a ring-shaped spring steel plate having a diameter smaller than the diameter of the small diameter portion, and after fitting the rotary disc to the small diameter portion of the rotary shaft,
The spring clamp is pushed into the small diameter portion to bring the ring portion into close contact with the rotating disk, to deform the tongue portion, and to cause the tip of the tongue portion to bite into the outer periphery of the small diameter portion.

[0005]

With the above means, the surface of the rotary disk is directly pressed against the end surface of the stepped portion of the rotary shaft by the spring clamp.
At that time, the tip of the tongue bites into the small diameter part of the rotating shaft, and the rotating disk is pressed against the rotating shaft by the spring stress generated by the displacement of the tongue, and is fixed by the frictional force of the pressing force. There is no tilting of the rotating disc, which makes the construction and mounting work extremely simple.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an (a) main part side sectional view and (b) front view showing an embodiment of the present invention, and FIG. 2 is a (a) side sectional view and (b) front view of a spring clamp. In the figure, 1 is a fixed part such as a motor, 2 is a rotary shaft supported by the fixed part 1 via a bearing 11, 21 is an end face of the rotary shaft 2, and 22 is the rotary shaft 2.
It is a small-diameter portion formed between the end surface 21 and the end surface 23 of the stepped portion. 3 is a rotating disk having a mounting hole 31 which can fit into the small diameter portion 22 in the center, 4 comprises an inner diameter that can fit into the small diameter portion 22, front and back both sides in parallel supporting plates, an outer diameter d ₁ is rotated It is larger than the diameter d _{2 of the} shaft 2. 5 is a spring clamp made of a ring-shaped spring steel plate,
1 has tongue portions 52 projecting from at least three locations at equal intervals in the circumferential direction from the inner circumference toward the center, and the diameter d ₃ of the circle connecting the tips of the tongue portions 52 is the diameter d of the small diameter portion 22. _It is smaller than ₄ . Notches 53 are provided on both sides of the tongue portion 52 in order to increase the amount of displacement of the tongue portion 52.

When the rotary disc 3 is attached to the rotary shaft 2, first, the support plate 4 is fitted into the small diameter portion 22, and then the rotary disc 3 is fitted into the small diameter portion 22. Next, the tongue portion 52 of the spring clamp 5 is pushed into the small diameter portion 22,
The tip of the disk is displaced to bring the ring portion 51 into close contact with the surface of the rotating disk 3. At this time, the tip of the tongue portion 52 bites into the small diameter portion, and displacement of the tongue portion 52 causes spring stress,
The ring portion 51 of the spring clamp 5 presses the rotary disc 3 together with the support plate 4 against the end face 23 of the stepped portion of the rotary shaft 2, and the frictional force fixes the rotary disc 3 to the rotary shaft 2. At this time, the surface of the rotary disk 3 is directly pressed by the spring clamp 5 against the end surface 23 of the stepped portion of the rotary shaft 2, so that the rotary disk 3 does not tilt with respect to the rotary shaft 2. The diameter d ₂ of the rotating shaft 3 is equal to the spring clamp 5
When the outer diameter d ₅ of the ring portion 51 is substantially equal to or larger than the outer diameter d ₅ , the support plate 4 may be omitted.

[0008]

As described above, according to the present invention, the rotary disc can be fixed to the rotary shaft by merely pressing the surface of the rotary disc against the end face of the stepped portion of the rotary shaft by the spring clamp. On the other hand, the rotating disc does not tilt, the structure and the mounting work are extremely simple, and there is an effect that a method of fixing the rotating disc that can significantly reduce the cost can be provided.

[Brief description of drawings]

FIG. 1A is a side sectional view and FIG. 1B is a front view showing an embodiment of the present invention.

FIG. 2 shows a spring clamp according to an embodiment of the present invention (a).
A side sectional view and (b) front view.

FIG. 3A is a side sectional view and FIG. 3B is a front view showing a conventional example.

[Explanation of symbols]

1 fixed part, 2 rotary shaft, 21 end face, 22 small diameter part,
23 stepped end face, 3 rotation disc, 31 mounting hole, 4
Support plate, 5 spring clamps, 51 ring parts, 5
2 tongue, 53 notch

Front page continuation (72) Inventor Hidenori Matsuura 2-1, Kurosaki Shiroishi, Hachimansai-ku, Kitakyushu, Fukuoka Prefecture Yasukawa Electric Co., Ltd.

Claims (1)

[Claims] 1. A method of fitting and fixing a rotary disk having a mounting hole capable of being fitted to the small diameter portion on a rotary shaft having a small diameter portion at the shaft end, from a ring portion and an inner circumference of the ring portion. A ring-shaped spring having tongues protruding from at least three locations at equal intervals in the circumferential direction toward the center, and having a diameter of a circle connecting the tips of the tongues smaller than the diameter of the small diameter portion. After providing a spring clamp made of a steel plate and fitting the rotary disc to the small diameter portion of the rotary shaft,
A rotation characterized in that the spring clamp is pushed into the small-diameter portion to bring the ring portion into close contact with the rotating disc, deform the tongue portion, and cause the tip of the tongue portion to bite into the outer periphery of the small-diameter portion. How to fix the disc.