JPH11294472A - Rotary body fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of eccentricity of a rotary body mounted on a shaft and to improve mounting precision. SOLUTION: A second slit S2 is cut in a direction orthogonal to the central axis of a pin hole 11 from a boundary position near the fastening bolt 6 for a diameter contraction deformed part 2 and a diameter expansion deformed part 3 into which this fixing tool is divided through a first slit, and the terminal part of the second slit is communicated with a pin hole 11. A deformation regulation pin 12 is inserted in a fit-in state in the pin hole 11 and since deformation of the pin hole 11 is blocked, during transmission of torque, eccentricity of the center of the cylindrical outer peripheral surface 4 of the diameter expansion deformation part 3 from the center of an axis to the fastening bolt 6 side is prevented from occurring, and mounting precision of the rotary body on the shaft is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotator fixing device for fixing a rotator to a shaft.

[0002]

2. Description of the Related Art Conventionally, when a rotating body such as a pulley or a gear is fixed to a shaft, for example, a rotating body fixing tool as shown in FIG. 5 is used.

[0003] The rotating body fixture A1 shown in the figure is made of a material having elasticity such as steel or aluminum and having a high elasticity. As shown in FIG. A radially contracted deformation portion A4 whose peripheral surface is frictionally fixed by tightening the tightening bolt A3, and a central hole H of the rotating body b
And a diameter-enlarging deformed portion A5 to be inserted into the shaft are connected in the axial direction.

[0004] The shaft hole A2 is formed so as to penetrate the diameter contraction deformation portion A4 and the diameter expansion deformation portion 5 in the axial direction.
By the first slit S1 which crosses the shaft hole A2 in the diameter direction, the diameter contraction deformation portion A4 and the diameter expansion deformation portion A5 are each divided into two parts.

The tightening bolt A3 is provided with a first slit S
1 is inserted into a bolt insertion hole formed on one side of the radially contracted deformation portion 4 and screwed into a screw hole formed on the other side.

Further, the tightening bolt A is inserted into the shaft hole A2.
The width W1 of the first slit S1 on the side where 3 crosses on the diameter contraction deformation portion side is formed wider than the width W2 on the diameter expansion deformation portion side.

[0007] A pair of pin holes A6 are formed on both sides of the first slit at a boundary position between the diameter contraction deformation portion A4 and the diameter expansion deformation portion A5 on the side opposite to the tightening bolt A3 side with respect to the shaft hole A2.
It is formed to penetrate symmetrically in the radial direction so as to form an acute angle with the two centers as vertices.

In each of the two portions divided by the first slit S1, a radially contracted deformation portion A
4 from the outside of the boundary position near the tightening bolt A3 of the enlarged diameter deformed portion A5 in the direction orthogonal to the center axis of the pin hole A6.
Is cut, and the terminal end thereof communicates with the pin hole A6.

[0009] As shown in FIG.
When the tightening bolt A3 is assembled between the rotating body b and the tightening bolt A3 and tightened with a tool such as a wrench, as shown in FIG. Are drawn toward each other, and the inner peripheral surface of the shaft hole A2 on the side of the radially contracted deformation portion A4 is pressed against the outer peripheral surface of the shaft a.

When the tightening bolt A3 is further tightened from here, the first portion of the portion of the radially contracted deformation portion A4 opposite to the side through which the tightening bolt A3 penetrates with respect to the shaft hole A2.
The interval between the slits S1 becomes wider.

The widening displacement of the first slit S1 in the above-mentioned portion is performed through a continuous portion C between the first slit S1 and the pin hole A6 as shown in FIG.
As a result, the outer peripheral surfaces on both sides of the two portions of the enlarged diameter deformed portion A5 are pressed against the inner peripheral surface of the center hole H of the rotating body.

Then, the inner peripheral surface of the center hole H restricts further expansion displacement of the first slit S1 on the side opposite to the side on which the fastening bolt A3 penetrates with respect to the shaft hole A2. Therefore, by further tightening the tightening bolt A3, the first slit S1 on the side closer to the tightening bolt A3 with respect to the shaft hole A2 is displaced in a direction in which the distance decreases.

At this time, as shown in FIG. 5, the width W1 of the slit S1 in the diameter contraction deformation portion A4 on the side where the tightening bolt A3 crosses the shaft hole A2 is the same as that of the diameter expansion deformation portion A5 on the same side. Because it is wider than the width W2 of the slit S1,
First, the opposing sides of the first slit S on the tightening bolt A3 side in the enlarged diameter deformed portion A5 abut.

When the tightening bolt A3 is further tightened in this state, the inner peripheral surface of the shaft hole A2 is strongly pressed against the shaft a on the side of the radially contracted deformation portion A4 to be frictionally fixed. The outer peripheral surface is strongly pressed against the inner peripheral surface of the center hole H of the rotating body b and is frictionally fixed, so that the shaft a and the rotating body b are integrally connected via the rotating body fixture A1. In addition, the pin hole A6 is provided in order to reduce the concentration of stress generated at the end of the second slit S2.

In the rotating body fixture A1 having the above-described structure, since the shaft a can be disassembled into two parts on both sides, as shown in FIG. 6, the diameter of the shaft a on both sides is larger than the diameter of the center part.
There is an advantage that the rotating body b can be fixed to the central part of the shaft and the assembly and removal of the rotating body b with respect to the shaft a can be performed quickly and easily.

[0016]

In the above-mentioned conventional rotary member fixing device A1, increasing the diameter of the pin hole A6 has a greater effect of alleviating the concentration of stress acting on the terminal end of the second slit S2. However, when the diameter of the pin hole A6 is increased to cope with a high load, the pin hole A6 is elastically deformed by the torque transmitted between the shaft a and the rotating body b via the rotating body fixture A1. There is a problem that the rotating body b is easily eccentric with respect to the shaft a, and the mounting accuracy of the rotating body b with respect to the shaft a is reduced.

When the rotating body b is fixed to the shaft a, when the tightening bolt A3 is tightened, the enlarged diameter deformed portion A5
Is elastically deformed, as shown exaggeratedly in FIG.
Since the center O 'of the cylindrical outer peripheral surface of the enlarged diameter deforming portion A5 is displaced toward the tightening bolt A3 by the distance e with respect to the center O of the shaft a, the rotating body b is eccentrically fixed to the shaft a. There was a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and to provide a rotating body fixture capable of improving the mounting accuracy of the rotating body with respect to the shaft.

[0019]

In order to achieve the above-mentioned object, a first rotating body fixing device according to the present invention comprises an elastically deformable radially contracted deformation portion and a cylindrical outer periphery adapted to a center hole of the rotating body. An elastically deformable diameter-enlarging deformation portion having a surface is provided in the axial direction, and a shaft hole having an inner diameter that is substantially concentric with the cylindrical outer peripheral surface and fits with the shaft is formed in a radially expanding deformation portion. It is formed so as to penetrate the deformed portion in the axial direction.

Each of the radially contracted deforming portion and the radially enlarged deforming portion is divided into two parts by a first slit traversing the shaft hole in the diametrical direction. The two parts are tightenably and separably connected to each other by a tightening bolt crossing one slit, and the width of the first slit on the side where the tightening bolt crosses the shaft hole is reduced in diameter. The deforming portion is formed wider than the diameter-enlarging deforming portion.

A pair of pin holes penetrating in the radial direction are provided on both sides of the first slit at a boundary position between the radially contracted deformation portion and the radially expanded deformation portion on the side opposite to the tightening bolt with respect to the shaft hole. Are symmetrically formed such that the central axis of the forms an acute angle from the center of the shaft hole.

In each of the two portions divided by the first slit, a direction perpendicular to the center axis of the pin hole is defined from a boundary position between the diameter contraction deformation portion and the diameter expansion deformation portion near the tightening bolt. The second slit is cut, the terminal end thereof communicates with the pin hole, and each pin hole has a length held between the outer peripheral surface of the shaft and the inner peripheral surface of the center hole of the rotating body. A deformation regulating pin having a diameter matching the pin hole is inserted.

A second rotary member fixing device according to the present invention comprises an elastically deformable radially contractible deformable portion and an elastically deformable radially enlarged deformable portion having a cylindrical outer peripheral surface adapted to the center hole of the rotary member. A shaft hole which is connected in the axial direction and has an inner diameter adapted to the shaft is formed so as to extend through the radially contracted deformation portion and the radially expanded deformation portion in the axial direction.

The radially contracted and deformed portion and the radially enlarged deformed portion are each divided into two portions by a first slit traversing the shaft hole in the diameter direction. The two parts are tightenably and separably connected to each other by a tightening bolt crossing one slit, and the width of the first slit on the side where the tightening bolt crosses the shaft hole is reduced in diameter. The deforming portion is formed wider than the diameter-enlarging deforming portion.

Also, the first position is determined from the boundary position between the outer peripheral surfaces of the radially contracted deformed portion and the radially enlarged deformed portion near the tightening bolt.
A second slit is cut out to a position crossing the center of the shaft hole and exceeding the center of the shaft hole, and the cylindrical outer peripheral surface is formed slightly eccentric from the center of the shaft hole to the side opposite to the tightening bolt side.

A third rotating body fixing device according to the present invention comprises an elastically deformable radially contracting deforming portion and an elastically deformable radially expanding deforming portion having a cylindrical outer peripheral surface adapted to the center hole of the rotating body. A shaft hole which is connected in the axial direction and has an inner diameter adapted to the shaft is formed so as to extend through the radially contracted deformation portion and the radially expanded deformation portion in the axial direction.

The diametrically contracted deformation portion and the diametrically enlarged deformed portion are each divided into two portions by a first slit traversing the shaft hole in the diametrical direction, and at positions deviated from the shaft hole of the diametrically contracted deformation portion,
The two parts are fastened and separated from each other by a tightening bolt crossing the first slit, and the width of the first slit on the side where the tightening bolt crosses the shaft hole has a diameter. The contraction deformation portion side is formed wider than the diameter expansion deformation portion side.

A pair of pin holes penetrating in the radial direction are provided on both sides of the first slit at the boundary between the radially contracted deformation portion and the radially expanded deformation portion on the side opposite to the tightening bolt with respect to the shaft hole. Are symmetrically formed such that the central axis of the forms an acute angle from the center of the shaft hole.

In each of the two portions divided by the first slit, the second portion extends in a direction orthogonal to the center axis of the pin hole from the boundary position near the tightening bolt between the radially contracted deformation portion and the radially expanded deformation portion. The slits are cut so that the terminal ends thereof communicate with the pin holes, and the length and pin hole which are held between the outer peripheral surface of the shaft and the inner peripheral surface of the center hole of the rotating body in each pin hole. The cylindrical outer peripheral surface is formed to be slightly eccentric from the center of the shaft hole to the side opposite to the tightening bolt side.

[0030]

The procedure for fixing the rotating body to the shaft using the rotating body fixing device of the present invention is the same as that of the above-described rotating body fixing device shown in FIG. In this case, stress concentration at the end of the second slit is reduced by the pin holes.

Further, since the deformation of the pin hole is prevented by the deformation regulating pin inserted in the pin hole, the center of the cylindrical outer peripheral surface of the enlarged diameter deforming portion is tightened from the center of the shaft during torque transmission. Eccentricity to the bolt side is prevented.

In the second rotating body fixing device of the present invention, the enlarged diameter deforming portion is elastically deformed by tightening the tightening bolt, and the center position of the cylindrical outer peripheral surface is tightened from the center position of the shaft. The cylindrical outer peripheral surface is preliminarily formed slightly eccentric from the center of the shaft hole to the side opposite to the tightening bolt side by the amount that causes the shift on the attached bolt side, so the shaft and the rotating body are almost integrally concentrically joined together. You.

Further, in the third rotating body fixing device of the present invention, similarly to the first rotating device, the stress concentration generated at the end of the second slit is reduced by the pin holes. Also,
The deformation of the pin hole is prevented by the deformation regulating pin inserted into the pin hole, so that the center of the cylindrical outer peripheral surface of the enlarged diameter deformed portion is eccentric from the center of the shaft toward the tightening bolt during torque transmission. And the second
Similarly to the above, the cylindrical outer peripheral surface is formed in advance slightly eccentric from the center of the shaft hole to the side opposite to the tightening bolt side, so that the center of the rotating body coincides with the center of the shaft with high accuracy. Can be combined.

[0034]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a first embodiment of a rotating body fixing device of the present invention, FIG. 2 is a cross-sectional view taken along a line AA in FIG. 1, and FIG. 3 is an exploded perspective view. As shown in these figures, the rotating body fixture 1 has a radially contracted deformation portion 2 and a radially expanded deformation portion 3 which are arranged adjacent to each other in the axial direction, and is elastically deformed of steel, aluminum, or the like. It is manufactured by cutting possible materials.

A cylindrical outer peripheral surface 4 is formed in the enlarged diameter deforming portion 3 so as to fit into a center hole of a rotating body (not shown).
In this embodiment, the outer peripheral surface of the diameter contraction deforming portion 2 is formed in a large-diameter cylindrical shape coaxial with the cylindrical outer peripheral surface 4.

The radially contracting and deforming part 2 and the diameter expanding and deforming part 3 penetrate in the axial direction and are concentric with the cylindrical outer peripheral surface 4 and adapted to the outer diameter of a shaft (not shown) on which the rotating body fixture 1 is mounted. A shaft hole 5 having an inner diameter is formed.

The diameter contraction deformation section 2 and the diameter expansion deformation section 3 are shown in FIG.
As shown in the figure, the shaft hole 5 is divided into two parts by a first slit S1 traversing the diameter direction thereof. In the diameter shrinkage deforming portion 2, the first
A tightening bolt 6 is mounted so as to cross the slit S1.

The tightening bolt 6 is inserted into a bolt insertion hole 7 having an inner diameter slightly larger than the diameter of the tightening bolt 6, formed in one of the portions of the radially contracted deformation portion 2 divided by the slit S1. It is inserted through the spring washer 8 from the outer peripheral side of the portion, is screwed into the screw hole 9 formed in the opposing surface C of the other portion of the radially contracted deformation portion 2 with the slit S1 interposed, and is divided by the slit S1. The two parts are connected to each other in a tightenable and separable manner.

Further, at the entrance side of the bolt insertion hole 7,
A notch 10 for receiving the head 6A of the tightening bolt 6 is formed, and the bottom thereof is a seat surface 10 for receiving the head 6A via a spring washer 8.

The facing surface F formed on one part of the radially contracted deformable portion 2 is provided with the radially enlarged deformed portion 3 which is arranged in the axial direction.
The screw hole 9 is also formed perpendicularly to the opposing surface F so as to incline slightly outward in the radial direction from the opposing surface F1.

Therefore, on the side where the tightening bolt 6 crosses the shaft hole 5, the width of the first slit S1 is such that the radially contracting and deforming portion 2 side expands and deforms when the tightening bolt 6 is loosened. It is slightly wider than the part 3 side.

A pair of radially penetrating parts is provided at the boundary between the radially contracted deforming part 2 and the radially enlarged deforming part 3 on the side opposite to the side where the tightening bolt 6 is disposed with respect to the shaft hole 5. The pin holes 11 are formed symmetrically on both sides of the first slit S1 such that their respective central axes form an acute angle θ from the center O of the shaft hole 5.

Each of the two portions divided by the first slit S1 is defined by a pin hole 1 from a boundary position near the tightening bolt 6 of the radially contracted deforming portion 2 and the radially enlarged deforming portion 3.
A second slit S <b> 2 is cut in a direction orthogonal to the center axis of the first S <b> 1, and the terminal end thereof communicates with the pin hole 11.

These pin holes 11 are provided with deformation restricting pins 12.
Is inserted. The deformation regulating pin 12 has an outer diameter that matches the inner diameter of the pin hole 11, and when the shaft (not shown) and the rotating body are coupled via the rotating body fixture 1, the deformation regulating pin 12 rotates with the outer peripheral surface of the shaft. It has a length to be held between the inner peripheral surface of the center hole of the body and is made of a material such as steel having the same rigidity and strength as the rotating body fixing device 1.

Further, in the rotating body fixing device 1 of this embodiment, the center O1 of the cylindrical outer peripheral surface 4 of the enlarged diameter deforming portion 3 when the tightening bolt 6 is loosened as shown in FIG.
Are formed to be shifted from the center O of the shaft hole 5 to the side opposite to the tightening bolt 6 by the amount of eccentricity e. In addition, FIG.
The eccentric state of the cylindrical outer peripheral surface 4 is shown in an exaggerated manner, and the value of the eccentric amount e is actually 25 μm to 100 μm.
It is in the range of μm.

The procedure for connecting the shaft (not shown) and the rotating body by the rotating body fixture 1 having the above-described structure is the same as that of the conventional rotating body fixture shown in FIG. However, in the rotating body fixing tool 1 of the present embodiment, when the rotating body fixing tool 1 is interposed between the shaft and the rotating body and the tightening bolt 6 is tightened with a wrench or the like, the second slit S
2, the inner peripheral surface of the shaft hole 5 is elastically deformed in the direction of tightening the outer peripheral surface of the shaft on the side of the diameter contraction deforming portion 2, while the cylindrical outer peripheral surface 4 is formed of the rotating body on the side of the diameter expanding deforming portion 3. It elastically deforms in a direction to press the inner peripheral surface of the center hole.

As a result, the center position of the cylindrical outer peripheral surface 4 is
Although it is slightly displaced toward the tightening bolt 6 as compared with the state before undergoing the elastic deformation, the center O1 of the cylindrical outer peripheral surface 4 is aligned with the center O of the shaft hole 5 as shown in FIG. On the other hand, since it is formed so as to be shifted by the eccentric amount e to the side opposite to the tightening bolt 6 side, the displacement of the cylindrical outer peripheral surface 4 due to the tightening of the tightening bolt 6 is offset by the eccentric amount e, and the shaft is offset with respect to the shaft. The rotator can be fixed without eccentricity.

The eccentricity e is determined by the amount of displacement (25 μm to 1 μm) of the cylindrical outer peripheral surface 4 generated when the bolt 6 is tightened.
(About 00 μm) may be set according to the size, material, and the like of the rotating body fixture 1.

When the torque is transmitted by the rotating body and the shaft connected via the rotating body fixing tool 1 in this manner, the radially contracting and deforming portion 2 of the rotating body fixing tool 1 is frictionally fixed to the shaft side, and the diameter expanding and deforming portion 3 is Since the rotor is frictionally fixed to the rotating body, the transmitted torque is applied between the first slit S1 and the two pin holes 11 through the radially contracting deforming portion 2 and the radially expanding deforming portion 3 as shown in FIG. It is transmitted through a pair of continuous portions C connected in the directions.

Therefore, when the transmission torque increases, the second
A stress is generated around the pin hole 11 formed at the end portion of the slit S2 to deform the pin hole 11, but inside the two pin holes 11, a deformation regulating pin 12 having an outer diameter adapted to the inner diameter is formed. The deformation of the pin hole 11 is prevented by the deformation restricting pin 12.

As a result, the displacement of the center position of the cylindrical outer peripheral surface 4 due to the deformation of the pin hole 11 is prevented, and the mounting accuracy between the shaft and the rotating body can be maintained high even during high torque transmission.

In the above-described embodiment, the pin hole 11 is formed at the end of the second slit S2, the deformation regulating pin 12 is inserted therein, and the center position O1 of the cylindrical outer peripheral surface 4 is set. Is eccentric from the center position O of the shaft hole 5 to the side opposite to the side of the tightening bolt 6 by a small distance e. However, even when the pin hole 11 in which the deformation regulating pin 12 is Can be prevented from shifting between the shaft and the center of the rotating body, and the mounting accuracy of the rotating body with respect to the shaft can be improved.

Further, the eccentricity of the rotating body due to the tightening of the tightening bolt 6 can be prevented only by eccentricity of the cylindrical outer peripheral surface 4 without fitting the deformation regulating pin 12 into the pin hole 11.

In particular, when the torque to be transmitted is small, the pin hole 11 for preventing stress concentration at the end of the second slit S2 may not be provided.

[0055]

As described above, according to the first aspect of the present invention, since the stress concentration at the end of the second slit is reduced by the pin holes, the durability of the rotating body fixture is improved. As a result, the deformation of the pin hole at the time of torque transmission is prevented by the deformation regulating pin inserted in the pin hole, so that the center of the cylindrical outer peripheral surface of the diameter-enlarged deformation portion becomes larger. Since the eccentricity from the center of the shaft toward the tightening bolt is prevented, the mounting accuracy of the rotating body with respect to the shaft during torque transmission can be improved.

Further, since the deformation of the pin hole is prevented by the deformation restricting pin, the diameter of the pin hole can be made larger than that of the conventional rotating body fixture, and the concentration of stress generated at the end of the second slit is greatly increased. Therefore, high torque can be transmitted.

According to the second aspect of the present invention, when the tightening bolt is tightened, the enlarged diameter deforming portion is elastically deformed, and the center position of the cylindrical outer peripheral surface is shifted from the center of the shaft to the tightening bolt side. Since the cylindrical outer peripheral surface is formed in advance slightly slightly eccentric from the center of the shaft hole to the side opposite to the tightening bolt, the mounting accuracy of the rotating body with respect to the shaft can be improved.

Further, according to the third aspect of the present invention, both the effects of the above-described first aspect and the effects of the second aspect are provided, and the mounting accuracy of the rotating body with respect to the shaft is further improved. And high torque can be transmitted.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a rotating body fixture of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is an exploded perspective view showing one embodiment of a rotating body fixing device of the present invention.

FIG. 4 is an exaggerated view of an eccentric state of a cylindrical outer peripheral surface of a rotating body fixing device with respect to a shaft hole in a rotating body fixing tool of the present invention.

FIG. 5 is a perspective view showing an example of a conventional rotating body fixture.

FIG. 6 is a cross-sectional view showing a state in which a rotating body is attached to a shaft using a conventional rotating body fixture.

FIG. 7 is a cross-sectional view as viewed in a direction of an arrow at a position XX in FIG. 6;

FIG. 8 is a cross-sectional view taken along a line YY in FIG.

FIG. 9 is an exaggerated view of an eccentric state of an outer peripheral surface of a diameter-enlarged deformation portion from an axial center when a conventional rotating body fixing tool is used.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rotating body fixture 2 Diameter contraction deformation part 3 Diameter expansion deformation part 4 Cylindrical outer peripheral surface 5 Shaft hole 6 Tightening bolt 6A Head 7 Bolt insertion hole 8 Spring washer 9 Screw hole 10 Notch 10A Seat surface 11 Pin hole 12 Deformation control pin

Claims (3)

[Claims] An elastically deformable radially contracting deformable portion and an elastically deformable radially expanding deformable portion having a cylindrical outer peripheral surface conforming to a center hole of a rotating body are connected in the axial direction, and the cylindrical member has a cylindrical shape. An axial hole substantially concentric with the outer peripheral surface and having an inner diameter adapted to the shaft is formed through the radially contracted deformation portion and the enlarged diameter deforming portion in the axial direction. Is divided into two parts by a first slit diametrically crossing the two parts. At a position deviated from the shaft hole of the radial contraction deformation part, the two parts are tightened and tightened by a tightening bolt crossing the first slit. The width of the first slit on the side where the tightening bolt crosses the shaft hole is formed wider on the diameter contraction deformation portion side than on the diameter expansion deformation portion side while being connected separably. Diameter contraction deformation part and diameter on the side opposite to the tightening bolt side A pair of pin holes penetrating in the radial direction are formed symmetrically on both sides of the first slit so that their respective central axes form an acute angle from the center of the shaft hole at the boundary position of the enlarged deformation portion. In each of the two divided parts, a second slit is cut in a direction orthogonal to the center axis of the pin hole from a boundary position near the tightening bolt of the radially contracted deformation portion and the enlarged diameter deformation portion. Deformation regulation having a terminal end communicating with the pin holes, a length held between the outer peripheral surface of the shaft and the inner peripheral surface of the center hole of the rotating body in each pin hole, and a diameter adapted to the pin hole. A rotating body fixture having a pin inserted therein. 2. An elastically deformable radially contracting deformable portion and an elastically deformable radially expanding deformable portion having a cylindrical outer peripheral surface adapted to a center hole of a rotating body are connected in the axial direction, and are connected to the shaft. A shaft hole having a suitable inner diameter is formed in the axial direction through the radially contracted deformation portion and the radially expanded deformed portion, and the radially contracted deformation portion and the radially expanded deformed portion each cross a shaft hole in the diameter direction. The two parts are divided into two parts at a position deviated from the shaft hole of the radially contracted deformation part. The width of the first slit on the side where the tightening bolt traverses the hole is formed wider on the radially contracted deforming part side than on the radially enlarged deforming part side, and the radially contracted deforming part and the radially expanded deforming part on the side closer to the tightening bolt. From the boundary position of the outer peripheral surface of each part A second slit is cut into a position crossing the first slit and exceeding the center of the shaft hole, and the cylindrical outer peripheral surface is formed slightly eccentric from the center of the shaft hole to a side opposite to the tightening bolt side. A rotating body fixture characterized by the following. 3. An elastically deformable radially contracting deformable portion and an elastically deformable radially expanding deformable portion having a cylindrical outer peripheral surface that fits into the center hole of the rotating body are connected in the axial direction. A shaft hole having a suitable inner diameter is formed in the axial direction through the radially contracted deformation portion and the radially expanded deformed portion, and the radially contracted deformation portion and the radially expanded deformed portion each cross a shaft hole in the diameter direction. The two parts are divided into two parts at a position deviated from the shaft hole of the radially contracted deformation part. The width of the first slit on the side where the tightening bolt crosses the hole is formed to be wider on the radially contracted deforming part side than on the radially enlarged deforming part side, and the radial contraction on the side opposite to the tightening bolt side with respect to the shaft hole. At the boundary between the deformed part and the enlarged diameter deformed part, A pair of pin holes penetrating in opposite directions are formed symmetrically on both sides of the first slit such that their respective central axes form an acute angle from the center of the shaft hole, and the two portions divided by the first slit are In each case, a second slit is cut in a direction perpendicular to the center axis of the pin hole from a boundary position near the tightening bolt between the diameter contraction deformation portion and the diameter expansion deformation portion, and the end portion communicates with the pin hole. In addition, a deformation regulating pin having a length that is held between the outer peripheral surface of the shaft and the inner peripheral surface of the center hole of the rotating body and a diameter that fits the pin hole is fitted into each of the pin holes, and the cylindrical shape is formed. A rotating body fixing device characterized in that an outer peripheral surface is formed slightly eccentric from a center of a shaft hole to a side opposite to a tightening bolt side.