JPH0235207A - Fixing means for rotor, rotor using same and manufacture thereof - Google Patents

Abstract

PURPOSE:To improve a completely accurate alignment and a fixing strength by forming a rotor fixing means for fixing a rotor rotating together with a rotation shaft of a member having a shape memory operation. CONSTITUTION:The major diameter of a rotor fixing means 1 before it is fixed is smaller than the minor diameter of a rotor 2 and the minor diameter of the rotor fixing means 1 is larger than the major diameter of a rotating shaft 3. When the rotor fixing means 1, therefore, is inserted into a ring shaped gap between the center hole of the rotor 2 and the major diameter of the rotating shaft 3, this operation can be readily carried out without requiring a strong force. When a heat treatment of determined temperature and time is applied, the rotor fixing means 1 made of a shape memory alloy has its shape changed, its major diameter enlarged and its minor diameter reduced. Thus, the rotor 2 and the rotating shaft 3 are fixed through the rotor fixing means 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotating body fixing device, a rotating body using the same, and a method for manufacturing the same. The present invention relates to a rotating body fixture suitable for fixing parts, particularly for centering and positioning, a rotating body using the same, and a method for manufacturing the same.

[Prior Art] In a conventional device, a rotating body is fixed to a rotating shaft by tightening with a screw, as described in, for example, Japanese Unexamined Patent Publication No. 61-79008.

In addition, the hole diameter (inner diameter) of the rotating body is made slightly smaller than the outer diameter of the rotating shaft, and the rotating body is fixed by shrink fitting, cold shrinking, etc., which are inserted using thermal expansion.

[Problem to be solved by the invention] 1. The former in the prior art, JP-A-61-79008
With the technology described in the publication, eccentricity is likely to occur if the mechanism is complex and the precision of each member is insufficient, and if there is an imbalance in the tightening force of the screw, vibrations are likely to occur during high-speed rotation. There was no consideration given to

In addition, the latter fitting technique using thermal expansion in the prior art described in 1. had problems in terms of the size of work equipment and work cost. In particular, there has been a problem in that it is difficult to position the rotating body with high precision when fixing it to the rotating shaft.

The present invention has been made in order to solve the problems in the prior art described in 1. The first object is to easily fix a rotating body to a rotating shaft with simple equipment, and to provide a shaft with sufficient precision. It is an object of the present invention to provide a rotating body fixture that can achieve centering and sufficient fixing strength.

A second object of the present invention is to provide a rotating body fixing device that enables highly accurate adjustment of the fixed position of the rotating body with respect to the rotating shaft (fixed position in the rotating shaft direction, fixed angle in the rotating direction). It is in.

Furthermore, the third object of the present invention is to attach to a rotating shaft,
The objective is to realize rotating bodies such as gears and pulleys that can be easily centered.

Furthermore, a fourth object of the present invention is to realize a screw fluid machine that facilitates the assembly and timing adjustment of synchronous gears in a pair of male and female screw rotors that mesh with each other.

Furthermore, a fifth object of the present invention is to improve the reliability of the rotating body fixing device used to achieve the first to fourth objects of item 2, and to manufacture a rotating body fixing device that is easy to manufacture. The purpose is to provide a method.

[Means for Solving the Problems] In order to achieve the above first object, the configuration of the first invention related to the rotating body fixing device of the present invention includes a rotating shaft, a rotating body rotating together with the rotating shaft, A rotating body fixing device for fixing a rotating body, which has an annular shape made of a member with shape memory effect, and has dimensions that allow it to be inserted into an annular gap between a rotating shaft and a hole in a rotating body before fixing. and when fixed,
Heat treatment at a specified temperature and time causes the material to return to its memorized dimensions and shape, and its outer diameter expands to become larger than the hole diameter of the rotating body, and then comes into contact with the rotating body.
The inner diameter is reduced to a diameter smaller than the shaft diameter of the rotary shaft and comes into contact with the rotary shaft, and the frictional force caused by this contact fixes the rotary body to the rotary shaft.

Other means may be used to achieve the first objective.

That is, the configuration of the second invention related to the rotating body fixing device of the present invention is based on the same premise as the first invention, in which a part of the rotating body fixing device is pre-rotated before being fixed to the rotating shaft. It is fixed to the body, and when it is fixed, it returns to the memorized size and shape by heat treatment at a specified temperature and time, and the inner diameter of the rotating body fixing device is reduced to be smaller than the shaft diameter of the rotating shaft. As the diameter becomes smaller, it comes into contact with the rotating shaft, and the frictional force caused by this contact fixes the rotating body to the rotating shaft.

Similarly, the configuration of the third invention is such that a part of the rotating body fixing tool is pre-warmed and fixed to the rotating shaft before being fixed to the rotating body, and when fixing, heat treatment is performed at a predetermined temperature and time. The function of returning to the memorized size and shape is activated by
The outer diameter of the rotating body fixing tool expands to a diameter larger than the diameter of the hole provided at the center of rotation of the rotating body, and comes into contact with the rotating body, and the frictional force from this contact fixes the rotating body to the rotating shaft. It is something to do.

Next, among the second objects described above, in order to enable highly accurate adjustment of the fixing position in the direction of the rotating shaft, the configuration of the fourth invention related to the rotating body fixture of the present invention is such that the rotating shaft and A rotating body fixing device that fixes a rotating body that rotates with the rotating shaft, and has an annular shape made of a member that has a shape memory effect, and its inner surface is fixed to the rotating shaft, and its outer surface is also the center of rotation of the rotating body. After it is fixed to the inner surface of a hole provided in or near it, and is fixed to both the rotating body and the rotating shaft, it is heated to a specified temperature and time to return to its memorized size and shape, and the rotation The outer surface fixed to the rotating body is deformed to move in parallel in the axial direction with respect to the inner surface fixed to the shaft, the amount of deformation is determined by the heat treatment conditions, and the rotating body is fixed in the axial direction with respect to the rotating shaft. The position can be adjusted by the amount of deformation.

Furthermore, among the purposes of ``2 Memory 2'', in order to enable highly accurate adjustment of the rotation angle in the rotation direction, the structure of the fifth invention related to the rotating body fixing device of the present invention is the same as that of the fourth invention. Based on the same premise, heat treatment at a specified temperature and time works to return to the memorized one-way shape, and the outer surface fixed to the rotating body rotates with respect to the inner surface fixed to the rotating shaft. The amount of deformation is determined by the heat treatment conditions, and the fixed angle of the rotational direction of the rotating body with respect to the axis of rotation can be adjusted by the amount of deformation.

Next, in order to achieve the purpose of ``2 Memory 3'', the structure of the rotating body according to the present invention is such that the rotating body is fixed to a rotating shaft and rotates together with the rotating shaft, and the rotating body has a hole for inserting the rotating shaft. is provided at the center of rotation, and an annular rotating body fixture made of a member with shape memory is fixed on or near the inner surface of the hole, and the inner diameter of the rotating body fixture is larger than the diameter of the rotating shaft. or equivalent, the rotating shaft can be inserted into the rotating body before being fixed to the rotating body or the rotating shaft, and when fixed, the dimensions and shape are memorized by heat treatment at a predetermined temperature and time. A device using a rotating body fixing device characterized in that the inner diameter of the rotating body fixing device is reduced to a small diameter and comes into contact with the rotating shaft, and is fixed to the rotating shaft by the frictional force caused by the contact. It is.

Further, in order to achieve the object of "-Memory 4," the screw fluid machine according to the present invention includes a pair of male and female screw rotors that mesh with each other in a casing, and the screw rotors mutually interact with each other with the casing or the mating screw rotor. In a screw fluid machine that rotates without contact while maintaining a minute gap, the screw fluid machine is equipped with synchronous gears that mesh with each other on each rotating shaft so as to synchronize the rotation of the pair of screw rotors. The synchronous gear is fixed to the rotating shaft using a rotating body fixing device that has an annular shape made of alloy and that returns to its memorized size and shape by heat treatment at a predetermined temperature and time. It is.

Furthermore, in order to achieve the fifth object, the method for manufacturing a rotating body fixture according to the present invention includes inserting the fixture into an annular gap between a rotating shaft and a hole in a rotating body to be rotated together with the rotating shaft. To make this possible, multiple layers of thin foil plates made of a member having a shape memory effect are wound to form an annular shape.

[Action Co. First, the first basic invention will be explained in detail.

When a rotating shaft is passed through a hole provided at the center of rotation of a rotating body, an annular gap will be created between the two if the hole diameter (inner diameter) of the rotating body is sufficiently larger than the outer diameter of the rotating shaft. .

An annular rotating body fixture made of metal or synthetic resin with shape memory is inserted into this gap. The rotating body fixing tool is molded to have a smaller outer diameter and a larger inner diameter than the memorized dimensions so that it can be easily inserted, so it can handle the force required between the rotating shaft and the rotating body after fixing. It can be inserted with a sufficiently small force.

After the rotating body fixture is inserted into a predetermined position, heat treatment is applied at a predetermined temperature and time.

By heat treatment, the rotating body fixture tries to return to its memorized size and shape, and its outer diameter becomes larger and its inner diameter becomes smaller.

Due to this deformation, the outer periphery strongly contacts the inner surface of the center hole of the rotating body, and as it continues to grow, it exerts stress on the rotating body.
The rotating body and the rotating body fixture are fixed by the frictional force caused by this stress.

On the other hand, the inner periphery of the rotating body fixture strongly contacts the outer periphery of the rotating shaft, and as it tries to become smaller, it exerts stress on the rotating shaft. The rotating shaft and the rotating body fixture are fixed by the frictional force caused by this stress.

In this way, the rotating body is fixed to the rotating shaft via the rotating body fixing device.

Furthermore, since the rotating body fixture is rotationally symmetrical with respect to the rotating shaft both before and after deformation, forces other than those in the radial direction are unlikely to be generated.

For this reason, the outer circumference of the rotating body fixture.

As long as the circularity of the inner circumference and the uniformity of the material are sufficient, the eccentricity between the fixed rotating shaft and the rotating body is extremely small.

The effect of the second invention is that in the effect of the first invention,
Everything is the same except that the rotating body and the rotating body fixture are fixed in advance.

Further, the operation of the third invention is the same as the operation of the first invention except that the rotating shaft and the rotating body fixture are fixed in some way.

Next, the fourth invention will be explained in detail.

After the rotating body fixture is fixed to both the rotating body and the rotating shaft, heat treatment is performed at a predetermined temperature and time. When the heat treatment is performed, the rotating body fixture tries to return to its memorized shape, and the outer surface is deformed by moving parallel to the inner surface in the axial direction. The amount of deformation changes depending on conditions such as temperature during heat treatment.

This can be achieved by adjusting the axial fixing position of the rotating body on the rotation axis 2 within the deformable range of the rotating body fixing device, or by adjusting the heat treatment conditions.

Monthly materials that have shape memory properties generally tend to return to the memorized shape after a long period of time at high temperatures, so when the position of the rotating body is moved significantly due to deformation of the rotating body fixture, heat treatment at high temperatures or for a long period of time is sufficient. . On the other hand, when only a small amount of deformation is required, it is better to set the heat treatment conditions to a lower temperature or a shorter time than in the previous example.

Further, the operation of the fifth invention is the same as that of the fourth invention except that the deformation of the rotating body fixture is not in the axial direction but in the rotational direction.

Needless to say, a rotary body and a screw fluid machine using these rotary body fixing devices have the desired effect.

Next, we will discuss the concept of the manufacturing method of the rotating body fixing tool.In general, the thinner or thinner the material (member) that has a shape memory effect, the more pronounced the effect will be. However, in the case of a thin plate, the deformation in the thickness direction is small. Therefore, by forming multiple layers of thin plates of members having a shape memory effect, the amount of deformation becomes the sum of these layers, and a sufficient amount of deformation can be ensured.

[Embodiments] Each embodiment of the present invention will be described below with reference to FIGS. 1 to 11.

First, an embodiment of the first invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is a cross-sectional view showing a state in which a rotating body fixing device according to an embodiment of the present invention is inserted between two rotating shafts of rotating bodies, and FIG. A cross-sectional view showing the condition,
FIG. 3 is a cross-sectional view showing a change in the inner and outer diameters of the rotating body fixture.

In FIG. 1, 1 is an annular rotating body fixture made of shape memory alloy, 2 is a rotating body, and 3 is a rotating shaft.

The outer diameter of the rotating body fixture 1 before fixing shown in FIG.
At the same time, the inner diameter of the rotating body fixture 1 is larger than the outer diameter of the rotating shaft 3. Therefore, inserting the rotating body fixture 1 into the annular gap between the center hole (inner diameter) of the rotating body 2 and the outer diameter of the rotating shaft 3 and placing it in the arrangement shown in Fig. 1 requires a strong force. It can be easily done without having to do it.

When these are subjected to heat treatment at a predetermined temperature and time, the rotating body fixture 1 changes shape as shown in FIG. 2, with the outer diameter becoming larger and the inner diameter becoming smaller. and,
As the outer diameter contacts the inner surface of the center hole of the rotating body 2 and tries to become larger, internal stress is generated on the inner surface of the rotating body 2.
The rotating body 2 and the rotating body fixture 1 are coupled together by the resulting frictional force. Similarly, the inner diameter of the rotating body fixture 1 comes into contact with the outer peripheral surface of the rotating shaft 3 and tends to become smaller.
Stress is generated on the surface of the rotating shaft 3, and the resulting frictional force connects the rotating shaft 3 and the rotating body fixture.

In this way, the rotating body 2 and the rotating shaft 3 are connected to the rotating body fixture 1.
Fixed via.

Since the rotating body fixture 1 uses a unidirectional shape memory alloy, the fixture will not come off even if the temperature is returned to room temperature after heat treatment.

Therefore, the dimensions of the rotating body fixture before deformation are shown in Figure 3 (
As shown in a), the outer diameter Do and inner diameter Dj are expressed, and the dimensions of the rotating body fixture after deformation are expressed as outer diameter DO' and inner diameter D1', as shown in Fig. 3(b). There is the following relationship.

Dj>Di D　o　<　D　.

According to this embodiment, the objective is to provide a rotating body fixing tool that can easily fix a rotating body to a rotating shaft with simple equipment, and that can achieve sufficient axis alignment accuracy and sufficient fixing strength. Having achieved the first object of the invention, it is possible to achieve the third object of the invention, which is to realize a rotating body that can be easily attached to a rotating shaft and easily centered by using this rotating body fixture.

Next, an embodiment of the second invention will be described with reference to FIGS. 4 and 5.

FIG. 4 is a sectional view showing a state in which a rotating body fixture according to another embodiment of the present invention is fixed to a rotating body and a rotating shaft is inserted, and FIG. FIG.

In FIG. 4, ] 1 is a rotating body fixture made of a shape memory alloy and has an annular (cylindrical) shape; 12 is a rotating body;
3 is a rotation axis.

The rotating body fixture 1] shown in FIG. 4 before fixing is the rotating body], 2
It is fixed in advance by casting into the center hole of
The inner diameter of the rotating body fixture 1'' is larger than the outer diameter of the rotating shaft 13. Therefore, it is possible to easily insert the rotating body fixture 11 integrated with the rotating body 12 into the rotating shaft] 3 without requiring strong force.

When heat treatment is applied at a specified temperature and time in the state shown in FIG. As they come into contact and try to become smaller, stress is generated on the surface of the rotating shaft 13, and the resulting frictional force connects the rotating shaft 13 and the rotating body fixture cord. In this way,
The rotating body 12 and the rotating shaft 13 are fixed via the rotating body fixture 11.

According to this embodiment, the same effects as described in the previous embodiment can be obtained, and the first and third objects of the present invention can be achieved.

Next, an embodiment of the third invention will be described with reference to FIGS. 6 and 7.

FIG. 6 is a sectional view showing a state in which a rotating body fixing device according to still another embodiment of the present invention is fixed to a rotating shaft and inserted into a rotating body, and FIG. It is a sectional view showing a state after fixation.

In FIG. 6, 21 is an annular (cylindrical) rotating body fixture made of shape memory alloy; 22 is a rotating body;
3 is a rotation axis.

The rotating body fixture 21 before fixation shown in FIG. 6 is fixed to the rotating shaft 23 by press fitting, and the outer diameter of the rotating body fixture 21 is smaller than the inner diameter of the center hole of the rotating body 22.

Therefore, the rotating body fixture 21 integrated with the rotating shaft 23 can be easily inserted into the rotating body 22 without requiring strong force.

When heat treatment is applied at a predetermined temperature and time in the state shown in FIG. 6, as shown in FIG. Since it contacts the inner surface of the hole and tries to grow further, the rotating body 2
Stress is generated on the inner surface of the rotor 2, and the resulting friction force connects the rotating shaft 23 and the rotating body fixture 2]. In this way, the rotating body 22 and the rotating shaft 23 are fixed via the rotating body fixture 2].

According to the embodiments shown in FIGS. 6 and 7, the same effects as described in the previous embodiments can be obtained, and the first and third objects of the present invention can be achieved.

Next, an embodiment of the fourth invention will be described with reference to FIG.

FIG. 8 is a sectional view of a rotating body fixing device that deforms in parallel according to still another embodiment of the present invention, (a) before deformation, (b)
The figure shows the deformed state.

The rotating body fixture 5 shown in FIG. 8 is made of a shape memory alloy and has an annular shape. In this rotating body fixture 5, the displacement A of the outer surface relative to the inner surface in the axial direction is determined by heat treatment conditions including temperature.

Utilizing this, it is possible to adjust the position of the rotating body fixed on the outer surface, which is attached to the rotating shaft fixed on the inner surface.

According to the embodiment shown in FIG. 8, the second object of providing a rotating body fixing device that enables highly accurate adjustment of the fixing position of the rotating body with respect to the rotating shaft, especially the fixing position in the direction of the rotating shaft is achieved. be able to.

Next, an embodiment of the fifth invention will be described with reference to FIG. 9.

FIG. 9 is a front view of a rotationally deformable rotating body fixing device according to still another embodiment of the present invention, (a) before deformation, (b)
The figure shows the deformed state.

In FIG. 9, 6 is an annular rotating body fixture made of a shape memory alloy, and 7 is a mark for indicating zero rotational displacement of the outer surface relative to the inner surface around the rotation axis.

The rotational displacement O of this rotating body fixture 6 is determined by heat treatment conditions including temperature.

Utilizing this, it is possible to adjust the rotation angle of the rotating body fixed to the outer surface of the rotating body fixture 6 with respect to the rotating shaft fixed to the inner surface of the rotating body fixture 6.

According to the embodiment shown in FIG. 9, the second object of providing a rotating body fixing device that enables highly accurate adjustment of the fixing position of the rotating body with respect to the rotating shaft, especially the fixing angle in the rotation direction is achieved. I can do it.

Next, an example of a rotating body using a rotating body fixture will be described with reference to FIG. 10.

FIG. 10 is a schematic configuration diagram of a screw fluid machine using the rotating body fixture of the present invention.

In FIG. 10, 5], 52 are a pair of male and female screw rotors that mesh with each other, 53 and 54 are their rotating shafts,
Reference numerals 55 and 56 indicate synchronous gears provided on the rotating shafts 53 and 54.

A pair of screw rotors 51. ．． 52 is a minute gap 2:) It rotates while ensuring a gap. Screw rotor 51.5
If the rotation synchronization of the two screws becomes out of synchronization, the screw rotors will come into contact with each other,
It generates noise and vibration, which can lead to accidents. Therefore, synchronizing gears 55, 56 are provided on each rotating shaft 53, 5/4, thereby achieving rotational synchronization.

However, it is not easy to adjust the fixing angle when fixing the synchronous gears 55, 56 to the rotating shafts 53, 54. The reason for this is that the gap between the screw rotors 51, 52 is very small, and if the fixed angle of the synchronous gears 55, 56 deviates by more than that gap, the screw rotors 51, 52...
This is because they come into contact with each other.

Therefore, the fixing and minute angle adjustment of the synchronous gears 55, 56 are performed using the rotary body fixing device of any one of the first to third aspects of the invention, as well as the fifth aspect of the invention.

According to the embodiment shown in FIG. 10, a screw fluid mechanism is realized that facilitates the assembly and timing adjustment of synchronous gears on a pair of male and female screw rotor shafts that mesh with each other,
The third and fourth objects of the present invention can be achieved.

Next, an example of a method for manufacturing a rotating body fixture will be described with reference to FIG. 11.

FIG. 11 is a front view of a rotating body fixture according to still another embodiment of the present invention.

The rotating body fixture 7 shown in FIG. 11 is a thin foil-like plate made of a shape memory alloy member, which is wound in multiple layers to form an annular shape.

In general, the thinner the shape memory effect is, the stronger it appears, so the rotating body fixture 7 shown in FIG. 11 can effectively utilize the shape memory effect.

That is, according to the embodiment shown in FIG. 11, the reliability of the rotating body fixing device used to achieve the first to fourth objects is increased, and a manufacturing method of the rotating body fixing device that is easy to manufacture is provided. The fifth object of the present invention to provide can be achieved.

Note that in each of the above embodiments, the member forming the rotating body fixing device is made of a shape memory alloy, but the present invention is not limited to this, and the rotating body fixing device may be formed using a synthetic resin having a shape memory effect. It's okay.

Also, the second. In the third invention, an example has been described in which the rotating body fixing tool is fixed to the rotating body by casting in advance, but the present invention is not limited to this.
There is no problem in fixing with screws or other means.

[Effects of the Invention] As mentioned above, according to the present invention, it is easy! The rotating body can be easily fixed to the rotating shaft using 1-ton equipment, and it achieves axis alignment with 1-minute accuracy and sufficient fixing strength.
It is possible to provide a rotating body fixture that enables highly accurate adjustment of the fixed position of the rotating body with respect to the rotating shaft (fixed position in the rotational axis direction, fixed angle in the rotational direction).

In addition, by using the rotating body fixing device of the present invention, it is possible to realize rotating bodies such as gears and pulleys that are easy to attach to a rotating shaft and center, and also to assemble synchronous gears on the screw rotor shaft of the a female row that meshes with each other. A screw fluid machine that facilitates timing adjustment can be realized.

Furthermore, it is possible to provide a method for manufacturing a rotating body fixture that increases the reliability of the rotating body fixture and is easy to manufacture.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a state in which a rotating body fixing device according to an embodiment of the present invention is inserted between two rotating shafts of the rotating bodies, and Fig. 2 is a sectional view showing a state in which a rotating body fixing device according to an embodiment of the present invention is inserted between two rotating shafts. FIG. 3 is a cross-sectional view showing changes in the inner and outer diameter dimensions of the rotary body fixing device, and FIG. 4 is a cross-sectional view showing a state in which a rotary body fixing device according to another embodiment of the present invention is fixed to a rotating body. FIG. 5 is a sectional view showing the state after the rotating body fixing device shown in FIG. 7 is a sectional view showing a state in which the rotating body fixing device is fixed to the rotating shaft and inserted into the rotating body, FIG. 7 is a sectional view showing the state after fixation by the rotating body fixing device shown in FIG. 6, and FIG. FIG. 9 is a cross-sectional view of a rotary body fixing device that undergoes parallel deformation according to yet another embodiment of the invention, and FIG. FIG. 11 is a front view of a rotary body fixture according to still another embodiment of the present invention. 1. 5, 6, 7, 1.1, 2] - rotating body fixture, 2.
12.22・Rotating body, 3, 13.23 Rotating shaft, 51
．． 52...Screw rotor, 55.56 synchronous gear.

Claims (1)

[Claims] 1. A rotating body fixing device for fixing a rotating shaft and a rotating body that rotates together with the rotating shaft, which has an annular shape made of a member having a shape memory function, and before fixing, It has dimensions that allow it to be inserted into the annular gap between the rotating shaft and the hole in the rotating body, and when it is fixed, it returns to its memorized size and shape through heat treatment at a specified temperature and time. , the outer diameter expands and comes into contact with the rotating body in an attempt to become a diameter larger than the hole diameter of the rotating body, and the inner diameter contracts and comes into contact with the rotating shaft in an attempt to become a smaller diameter than the shaft diameter of the rotating shaft, A rotating body fixing device that fixes a rotating body to a rotating shaft using frictional force caused by these contacts. 2. A rotating body fixture that fixes a rotating shaft and a rotating body that rotates together with the rotating shaft, which has an annular shape made of a member that has a shape memory effect, and a part of the rotating body fixture fixes the rotating body that rotates with the rotating shaft. It is fixed to the rotating body in advance before being fixed to the rotating body, and when it is fixed, the inner diameter of the rotating body fixing device is reduced by heat treatment at a specified temperature and time to return to the memorized size and shape. A rotating body fixing device that is characterized in that it comes into contact with the rotating shaft while trying to have a smaller diameter than the rotating shaft, and fixes the rotating body to the rotating shaft by the frictional force caused by the contact. 3. A rotating body fixing device that fixes a rotating shaft and a rotating body that rotates together with the rotating shaft, which has an annular shape made of a member that has a shape memory effect, and a part of the rotating body fixing device fixes a rotating body that rotates together with the rotating shaft. It is fixed to the rotating shaft in advance before being fixed to the rotating body, and when it is fixed, the outer diameter of the rotating body fixing device expands as it returns to its memorized size and shape through heat treatment at a specified temperature and time. A rotating body fixing device characterized in that the rotating body is fixed to the rotating shaft by the frictional force caused by the contact with the rotating body as the diameter of the hole becomes larger than the diameter of the hole provided at the rotation center of the rotating body. 4. A rotating body fixture that fixes a rotating shaft and a rotating body that rotates together with the rotating shaft, which has an annular shape made of a member that has shape memory, the inner surface of which is fixed to the rotating shaft, and the outer surface of which is fixed to the rotating shaft. is also fixed to the inner surface of the hole provided at the center of rotation of the rotating body or near it,
After it is fixed to both the rotating body and the rotating shaft, it is heated to a specified temperature and time to return to its memorized size and shape, and it is fixed to the rotating body against the inner surface fixed to the rotating shaft. The outer surface of the rotating body is deformed to move in parallel in the axial direction, the amount of deformation is determined by the heat treatment conditions, and the axial fixing position of the rotating body with respect to the rotating shaft can be adjusted by the amount of deformation. Rotating body fixture. 5. A rotating body fixing device that fixes a rotating shaft and a rotating body that rotates together with the rotating shaft, which has an annular shape made of a member that has a shape memory effect, the inner surface of which is fixed to the rotating shaft, and the outer surface of which is fixed to the rotating shaft. is also fixed to the inner surface of the hole provided at the center of rotation of the rotating body or near it,
After it is fixed to both the rotating body and the rotating shaft, it is heated to a specified temperature and time to return to its memorized size and shape, and it is fixed to the rotating body against the inner surface fixed to the rotating shaft. The outer surface of the rotating body undergoes rotational deformation in the rotation direction about the rotation axis, the amount of the deformation is determined by heat treatment conditions, and the fixed angle of the rotating body in the rotation direction with respect to the rotation axis can be adjusted by the amount of deformation. A rotating body fixture featuring: 6. In a rotating body that is fixed to a rotating shaft and rotates with the rotating shaft, a hole for inserting the rotating shaft is provided at the center of rotation, and the inner surface of the hole or the vicinity thereof has a shape memory effect. An annular rotating body fixing device is fixed by a member, the inner diameter of the rotating body fixing device is larger than or equal to the rotating shaft diameter, and the rotating body is fixed to the rotating body before the rotating body is fixed to the rotating body. When it is fixed, it returns to its memorized size and shape through heat treatment at a predetermined temperature and time, and the inner diameter of the rotating body fixture tries to become smaller and comes into contact with the rotating shaft. , A rotating body using a rotating body fixing device, which is fixed to a rotating shaft by the frictional force generated by the contact. 7. A pair of male and female screw rotors that mesh with each other are provided in the casing, and the screw rotors rotate without contact with the casing or the mating screw rotor while maintaining a small gap with each other, and the pair of screw rotors In a screw fluid machine that is equipped with synchronous gears that mesh with each other on each rotating shaft so as to synchronize the rotation of the rotor, the shape memory alloy has an annular shape and is memorized by heat treatment at a predetermined temperature and time. A screw fluid machine characterized in that the synchronous gear is fixed to a rotating shaft using a rotating body fixing device that has the function of returning to a certain size and shape. 8. Create an annular shape by wrapping multiple layers of thin foil-like plates of a member with shape memory so that it can be inserted into the annular gap between the rotating shaft and the hole of the rotating body that is to rotate with the rotating shaft. 1. A method for manufacturing a rotating body fixture, characterized in that the fixture is formed into a rotating body fixture.