JP2000185119A - Body of rotation with low moment of inertia - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a body of rotation to be easily swung round by constituting the body of rotation so that large masses of the radial mass distribution in rotation or revolution are concentrated at the center of rotation or in a range in the vicinity thereof and small masses are evenly or unevenly dispersed in other parts. SOLUTION: The upper half of a grip 13 is made a right hand area R and the lower half the left hand area L and a rotation center C is set in between. A weight 14 is attached at a point within a range 4 cm from the rotation center C to form concentrated mass on the grip 13. The weight 14 made of a metal material with large specific gravity such as tungsten is housed in the outer shell and a fitting part equipped on the outer shell is fit into the shaft 12 to assemble. The weight 14 is constituted so that large mass of the radial mass distribution in rotation or revolution is concentrated on a part of the center of rotation or a range in the vicinity thereof and small mass is evenly or unevenly dispersed in other parts. Thus the body of rotation can be easily swung round in swing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low inertia moment rotating body.

[0002]

2. Description of the Related Art For example, when swinging a golf club, rotation axes X1 and X2 of motion are generated between a body B and palms of both hands A as shown in FIG. Assuming that the rotation axis on the body B side is the first axis X1 and the rotation axis on the palm side is the second axis X2, the first axis X1 is the second axis X when viewed ergonomically.
2 can withstand a large load compared to
Axis X1 is affected by even a slight increase in load. Therefore, even if the load on the first axis X1 side increases, it is expected that the overall mobility can be improved if the load on the second axis X2 side can be reduced. Here, FIG.
Shows the relationship between the body and the club shaft immediately after the start of the swing, (b) immediately before the impact, and (c) immediately after the impact. In the figure, S is a club shaft,

In order to reduce the load on the second shaft, a weight is provided at the rear end of the grip to improve the static imbalance and the dynamic imbalance, thereby enabling a golf club to swing lightly. Has been proposed (see, for example, Japanese Patent No. 2581577).

[0004]

However, in the conventional golf club described above, the tip head side and the rear end side are balanced with the second shaft as a fulcrum, so that the golf club can be lightly supported by both hands. However, there is a problem that the moment of inertia about the second axis increases by an amount corresponding to the addition of the weight, and the golf club cannot be swung without a large force when swinging.

[0005] In view of the above problems, it is an object of the present invention to provide a golf club that can be swung lightly when swinging.

[0006]

Means for Solving the Problems The inventors of the present invention have made various prototypes in order to solve the above-mentioned problems, and have repeated experiments on the relationship between the mass distribution and the moment of inertia. As a result, they have found the following. . That is, as shown in FIG. 1 (a), when the center of a rod material having an ultra-light weight and a moment of inertia smaller than that of the columnar rotating body is vertically connected to the columnar rotating body having a large mass, the rotating body after the coupling is formed. Is smaller than the inertia moment of the columnar rotating body alone, despite the addition of the mass of the bar. However, in FIG.
As shown in (b), when the rod was too long, the moment of inertia of the rotating body after coupling became larger than the moment of inertia of only the columnar rotating body. Therefore, to reduce the moment of inertia, the length of the bar was limited,
It was necessary to determine the value by experiments in consideration of the relationship between the mass of the columnar rotating body and the radius of rotation.

Further, as shown in FIG. 1 (c), when a columnar rotating body having a smaller inertia moment but a larger mass than the rotating body is connected to the center of rotation of the disk-shaped rotating body, The moment of inertia of the rotating body is smaller than that of the disk-shaped rotating body alone. Furthermore, when a columnar rotor with a smaller inertia but a larger mass is connected to the center of rotation of a ring-shaped rotor with a heavier outer periphery, the inertia of the rotor after coupling is only the ring-shaped rotor. Became smaller than the moment of inertia.

Therefore, when the mass is concentrated on the center of rotation or the radius of rotation of the rotating body is increased by using an ultra-light rod, the moment of inertia as a whole can be reduced despite the increased mass. found.

Therefore, a low moment of inertia rotating body according to the present invention provides a rotating body that rotates or rotates around a center of rotation, wherein the mass distribution in the radial direction at the time of rotation or rotation is limited to the rotation center and the immediate vicinity thereof. Is characterized in that a large mass is concentrated in the range, and a small mass is distributed uniformly or non-uniformly in a range other than the rotation center and the immediate vicinity thereof.

The present invention is applicable not only to golf clubs but also to sports equipment such as baseball bats, tennis and other rackets, ski poles, bamboo swords, sabers, boat oars, tools such as hammer, pickaxe, plow, hoe, etc. (Hereinafter also referred to as hand-held tools). That is, the rotating body is a hand-held tool that grips or handles the grip or handle with one hand or both hands, and rotates or rotates around the center of the palm of one hand or between the two hands, and the rotation center of the grip or handle and its rotation center. A concentrated mass can be provided in the immediate vicinity.

In particular, when the present invention is applied to a golf club, since there is a center of rotation between both hands holding the grip, the concentrated mass is preferably provided within a range of 4 cm around the center of rotation of the grip. . This concentrated mass may be designed so that the mass is concentrated on the grip in advance when designing the club, the material of the grip may be appropriately selected and manufactured, or the grip may be manufactured with a normal material and the weight may be fixed. You may. When fixing the weight, it is preferable to select and fix a weight having an appropriate weight as a structure to which the weight can be attached and detached so that an optimum moment of inertia can be obtained by the muscle strength of the golf club user and the like. .

The present invention can be applied not only to hand-held tools but also to a reduction in the moment of inertia of a rotating mechanism such as a motor, a fan, and a door. In this case, a method of concentrating the mass on the rotating shaft of the rotating mechanism can be adopted, but it is preferable to provide the mass along the center axis direction of the rotating shaft in order to further reduce the moment of inertia. That is, the rotating body is a rotating shaft that is rotatably supported by a bearing and may have a rotating additive, and a concentrated mass is provided on the rotating shaft along a center axis direction of the rotating shaft. Structure.

The same effect can be obtained by increasing the radius of rotation of the rotating shaft of the rotating mechanism. That is, the rotating body is a rotatable shaft that is rotatably supported by a bearing and may have a rotating additive, and the rotating shaft has a mass of the rotating shaft or a weight of the rotating shaft and the rotating additive. It is also possible to adopt a structure in which one or a plurality of rod members having a predetermined length and having an extremely small mass as compared with the mass are mounted symmetrically and perpendicularly to the rotation axis. Further, the rotating body is a rotating shaft that is rotatably supported by a bearing and may have a rotating additive, and the rotating shaft has a mass of the rotating shaft or a weight of the rotating shaft and the rotating additive. It is also possible to adopt a structure in which a plate-like body having a predetermined outer diameter having an extremely small mass as compared with the mass is mounted perpendicular to the rotation axis. Such a method of increasing the radius of rotation can be used together with the above-described structure in which a concentrated mass is provided on the rotating shaft.

The present invention can also be applied to a case where the moment of inertia is reduced in an existing rotating body, and a method of reducing the moment of inertia can be novel. That is, according to the present invention, there is provided a method for reducing the moment of inertia of a rotating body that rotates or rotates around a rotation center, wherein a weight is added to the rotation center and a portion immediately adjacent to the rotation center to rotate or rotate. The mass distribution in the radial direction at the time of movement is such that a large mass is concentrated in the range of the rotation center and its immediate vicinity, and a small mass is uniformly or non-uniformly distributed in the range other than the rotation center and its immediate vicinity. A method of reducing the moment of inertia of the rotating body, characterized in that the distribution is made as described above.

Further, according to the present invention, there is provided a method for reducing the moment of inertia of a rotating body which is rotated or rotated about a rotation center, wherein the rotation center has a very small mass having a very small mass. Or, a plurality of rods are symmetrically and vertically attached to the rotation center, and a mass distribution in a radial direction at the time of rotation or rotation is concentrated in the rotation center and a range immediately adjacent to the rotation center, and A method for reducing the moment of inertia of a rotating body, characterized in that a small mass is distributed uniformly or non-uniformly in a range other than the rotation center and a region immediately adjacent to the rotation center.

Further, according to the present invention, there is provided a method for reducing the moment of inertia of a rotating body which is rotated or rotated around a center of rotation, the plate having a predetermined outer diameter having an extremely small mass at the center of rotation. The body is attached perpendicularly to the rotation center, and the mass distribution in the radial direction at the time of rotation or rotation,
A large mass is concentrated in the rotation center and a range immediately adjacent to the rotation center, and a small mass is uniformly or non-uniformly dispersed in a range other than the rotation center and a range immediately adjacent to the rotation center. A method of reducing the moment of inertia of the rotating body.

Further, according to the present invention, there is provided a method for reducing the moment of inertia of a rotating body which rotates or rotates around a center of rotation, wherein a weight is added to the center of rotation and a portion immediately adjacent to the center of rotation. One or a plurality of rods of a predetermined length having an extremely small mass are attached symmetrically and perpendicularly to the rotation center at the rotation center, and the mass distribution at the time of rotation or rotation is determined by the rotation center and its rotation. A large mass is concentrated in the immediate vicinity, and a small mass is distributed uniformly or non-uniformly in the region other than the rotation center and the vicinity. A method for reducing the moment can be provided.

Still further, according to the present invention, there is provided a method for reducing the moment of inertia of a rotating body which rotates or rotates around a center of rotation, wherein a weight is added to the center of rotation and a portion immediately adjacent to the center of rotation. At the same time, a plate-like body having a predetermined outer diameter having an extremely small mass is attached to the rotation center perpendicularly to the rotation center, and the mass distribution at the time of rotation or rotation is limited to the rotation center and a range immediately adjacent to the rotation center. Is a method of reducing the moment of inertia of a rotating body, characterized in that a large mass is concentrated, and a small mass is distributed uniformly or non-uniformly in a range other than the rotation center and its immediate vicinity. Can be provided.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to specific examples shown in the drawings. FIG. 2 shows a preferred embodiment of a low moment of inertia rotating body according to the present invention, which is an example applied to a wood type golf club. As shown in FIG. 2A, the wood type golf club 10 has a club head 11 attached to the tip of a shaft 12, a grip 13 provided at the rear end of the shaft 12,
An end cap 15 is fixed to the rear end of 3.

As shown in FIG. 2B, the grip 13 has a right-hand area R where the upper half is gripped with the right hand, and a left-hand area L where the lower half is gripped with the left hand. As shown in FIG. 2B, a weight 14 is added to the grip 13 within a range of 4 cm or less around the rotation center C, and the weight 14 is a concentrated mass of the grip 13. It has become.

FIG. 3 shows one of the concrete structures in which the weight 14 is provided.
Here is an example. The weight 14 is made of a metal material having a large specific gravity, for example, tungsten or lead. The weight 14 is contained in an outer shell, for example, an outer shell 16 made of 17-4 stainless steel. Shaft fitting portions 16a are formed in the outer shell 16 at the outer peripheral portions at both ends, a portion corresponding to the rotation center C of the grip 13 of the shaft 12 is cut, and the cut ends are fitted into the fitting portions 16a of the outer shell 16. A grip 13 is attached from above, and the outer shell 16 reinforces a connection portion of the shaft 12.

FIGS. 4A and 4B show another example of a specific structure in which the weight 14 is provided. In FIG. 4A, the weight 14 is made of 17-7 stainless steel, and is manufactured to have a structure including a cylindrical portion and an outer cylindrical portion, and the rear end of the shaft 12 has the outer cylindrical portion of the weight 14 and the cylindrical portion. An extension shaft 12a made of a reinforced plastic pipe is attached to an outer cylindrical portion of the weight 14 so that the weight 14 is near the rotation center of the grip 13.
Is externally fitted, and a rubber grip 1 is provided on the outside of the shaft 12 and the extension shaft 12a via a layer 17 of a foamed resin material.
3 are attached.

In FIG. 4B, a weight 14 is inserted into and fixed to the shaft 12 at the position of the center of rotation of the grip 13, and an annular reinforcing rib 18 made of synthetic resin and a weight are provided outside the shaft 12. A reinforced plastic pipe 19 is externally fitted via an annular reinforcing rib 14a having a large specific gravity functioning as a weight, and a space between the reinforced plastic pipe 19 and the shaft 12 is filled with a foamed resin material 20 for absorbing shock. The rubber grip 13 is attached to the outside of the plastic pipe 19. The portion of the foamed heavy material 20 may be left hollow.

FIGS. 5A and 5B show still another example of a specific structure in which the weight 14 is provided. In this example, a weight 14 is inserted and fixed in the shaft 12 at the position of the rotation center of the grip 13, and a second weight 14 b is attached to the outside of the shaft 12, and a base material or a foamed resin material is used. 21 is attached so as to cover the rear end portion of the shaft 12, and a rubber grip 13 is attached to the outside thereof.

The above structure is similar to the iron type golf club 30 and the grip 33 of the putter 40 shown in FIGS.
43 can also be applied. Further, in the so-called long putter 50 shown in FIG. 6C, the grip 53 and the lower grip 53a are grasped with a gap between both hands, and there is a rotation center C between them. Therefore, a weight may be provided at the rotation center C in the shaft 12 of the long putter 50.

Here, to give specific numerical values, in the case of a wood type golf club, the total length is about 96 cm to 120 cm,
Total weight 230g-420g, head weight 180g-25
0g, shaft weight 30g-100g, grip weight 2
The weight was 5 g to 70 g, the length was 20 cm to 30 cm, and the weight provided at the center of rotation of the grip was optimally 5 g to 18 g.

In the case of an iron type golf club, the total length is about 8
1 cm to 107 cm, total weight 250 g to 480 g, head weight 220 g to 350 g, shaft weight 35 g to 10
0g, grip weight 25g-70g, length 20cm-3
0cm, and the weight provided at the center of rotation of the grip is 5g
１８18 g was optimal.

In the case of a putter, the total length is about 76 cm to 122 c.
m, total weight 300g-600g, head weight 250g ~
The weight is 400 g, the shaft weight is 40 g to 120 g, the grip weight is 45 g to 200 g, and the length is 20 cm to 35 cm.
However, in the case of a so-called long putter, the grip is divided into two for the left hand and the right hand, each having a length of 15 cm to 2 cm.
It is 5 cm, weighs 20 g to 100 g, and is arranged within 100 cm from the grip end. For this putter,
The weight provided at the rotation center was optimally 10 g to 25 g.

Further, in the case of a so-called chipper type club located between the putter and the iron, the total length is about 76 cm.
~ 122cm, total weight 300g ~ 600g, head weight 250g ~ 400g, shaft weight 40g ~ 120g,
Grip weight 25g-70g, length 20cm-30cm
And the weight provided at the center of rotation of the grip is 5 g to 18 g
g was optimal.

FIG. 7 shows a second embodiment of the low inertia moment rotating body according to the present invention, which is an example applied to a wind power generator. In the wind power generator 60, the lower end of a wind direction shaft 64 extending in the vertical direction is rotatably supported by a bearing, and the wind direction shaft 6
A generator main body 61 is attached to the upper end of 4, and three blades 63... Are fixed to a rotation shaft 62 of the generator main body 61. Are directed, and the blades 63.
Is rotated to generate power in the generator body 61.

A weight 65 having a large specific gravity is provided in the wind direction shaft 64 along the axial direction to reduce the moment of inertia when the wind direction shaft 64 rotates around the central axis. The rotating shaft 62 of the generator main body 61 is provided with weights 67, 67 along its central axis to reduce the moment of inertia during rotation of the rotating shaft 62 around the central axis. If the main purpose is to reduce the moment of inertia of the wind direction shaft 64, the weight 67 may be changed to an ultra-light bar.

Further, the blades 63 are provided with a rod member 66... Of ultra-light weight and a predetermined length (preferably obtained by an experiment) symmetrically with respect to the center line of the rotation shaft 62. The rotation shaft 62 is mounted vertically so as to reduce the moment of inertia in rotation of the rotation shaft 62 about the central axis. Some wind direction generators do not have a wind direction axis. In this case, the moment of inertia of the rotating shaft 62 can be reduced by providing only the weight 67 and the bar 66.

FIGS. 8A and 8B show third and fourth embodiments of the low inertia moment rotating body according to the present invention. FIG. 8 (a)
Is an example applied to a generator. The generator 70 has a rotor 7
1 is supported on a rotating shaft 72, a weight 73 having a large specific gravity is provided on the rotating shaft 72 along the center axis thereof, and a super-lightweight rod member 74 of a predetermined length is mounted on the rotating shaft 72. Mounted symmetrically and vertically with respect to In the case of a hydroelectric generator, the rotating shaft 72 rotates at a relatively low speed. However, in the case of a generator using a turbine, the rotating shaft 72 rotates at a high speed.

FIG. 8B shows an example applied to a transmission shaft mechanism. In the transmission shaft mechanism 80, the transmission shaft 81 is rotatably supported by bearings. The transmission shaft (rotation shaft) 81 is provided with a weight 82 having a large specific gravity along its central axis. Are mounted symmetrically and perpendicularly to the transmission shaft 81.

FIG. 9 shows fifth and sixth embodiments of the low inertia moment rotating body according to the present invention. FIG. 9A shows an example applied to an electric motor. In the motor 90, a stator 91 is mounted in a housing, and a rotor 9 is mounted in the stator 91.
2, the rotor 92 is supported by a rotating shaft 93, and the rotating shaft 93 is rotatably supported by a housing by a bearing (not shown). A weight 94 having a large specific gravity is provided on the rotating shaft 93 along its central axis, and an ultralight rod 95 of a predetermined length is mounted on the rotating shaft 93 symmetrically and vertically with respect to the rotating shaft 93. Have been.

FIG. 9B shows an example applied to a gear transmission mechanism. In the gear transmission mechanism 100, a pair of spur gears 101, 1
02 are engaged with each other, and both gears 101 and 102 are attached to rotating shafts 103 and 104, respectively.
Are rotatably supported by bearings (not shown). Ultralight rods 105 and 106 having a predetermined length are attached to the rotating shafts 103 and 104 symmetrically and perpendicularly to the rotating shafts 103 and 104.

FIG. 10 shows a seventh embodiment of the low inertia moment rotating body according to the present invention, which is an example applied to a bevel gear transmission mechanism. In the bevel gear transmission mechanism 110, a pair of bevel gears 111 and 112 mesh with each other, and both gears 111 and 11
2 is attached to the rotating shafts 113 and 114. Weights 115, 116 having a large specific gravity are provided on the rotation shafts 113, 114 along their central axes.
4, super-lightweight rods 117 and 118 of a predetermined length are mounted symmetrically and perpendicularly to the rotating shafts 113 and 114.

FIG. 11 shows an eighth embodiment of the low inertia moment rotating body according to the present invention, which is an example applied to a torque converter. In the torque converter 120, the input shaft (rotating shaft) 121 and the output shaft (rotating shaft) 122 are provided with rod members 123, 124 of a predetermined length, which are ultralight, on the rotating shaft 121,
It is mounted symmetrically and perpendicular to 22.

FIG. 12 shows ninth and tenth embodiments of the low inertia moment rotating body according to the present invention. FIG. 12A shows an example applied to a centrifugal dehydrator. In the centrifugal dehydrator 130, a weight 132 having a large specific gravity is provided on a central axis (rotating shaft) 131 rotatably supporting the dehydration tank so as to protrude into the dehydration tank along its central axis. A light-weight rod 133 having a predetermined length is symmetrically and perpendicularly attached to the central axis 131.

FIG. 12B shows an example applied to a fan mechanism. In the fan mechanism 140, a material having a large specific gravity is used for a central shaft (rotating shaft) 141 that supports the fan, and an ultralight rod member 142 of a predetermined length is symmetrical and perpendicular to the central shaft 141 for the central shaft 141. Mounted on

FIG. 13 shows an eleventh embodiment of a low inertia moment rotating body according to the present invention, which is an example applied to a rotary door mechanism. In the rotary door mechanism 150, the rotating shaft 15
Are rotatably erected on the floor surface, a plurality of doors 152 are attached to the rotating shaft 151, and a weight having a large specific gravity is provided on the rotating shaft 151 along its central axis. .

FIG. 14 shows a twelfth embodiment of the low inertia moment rotating body according to the present invention, which is an example applied to a door mechanism. Rotary shaft (or hinge) for door mechanism 160
A door 162 is supported on the rotating shaft 161 and a weight 163 having a large specific gravity is provided on the rotating shaft 161 along the center axis thereof.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining means for solving a problem.

FIG. 2 is a schematic view showing a preferred embodiment of a low inertia moment rotating body according to the present invention.

FIG. 3 is a view showing an example of a specific attachment structure of a weight in the embodiment.

FIG. 4 is a view showing another two examples of the specific mounting structure of the weight.

FIG. 5 is a view showing still another example of a specific attachment structure of the weight.

FIG. 6 is a view showing another golf club to which the structure of the embodiment can be applied.

FIG. 7 is a perspective view showing a second embodiment.

FIG. 8 is a perspective view showing a third and a fourth embodiment.
You.

FIG. 9 is a perspective view showing fifth and sixth embodiments.

FIG. 10 is a perspective view showing a seventh embodiment.

FIG. 11 is a perspective view showing an eighth embodiment.

FIG. 12 is a perspective view showing ninth and tenth embodiments.

FIG. 13 is a perspective view showing an eleventh embodiment.

FIG. 14 is a perspective view showing a twelfth embodiment.

FIG. 15 is a diagram for explaining a conventional technique.

[Explanation of symbols]

Reference Signs List 10 wood-type golf club 11 head 12 shaft 13 grip 14 weight 14a weight 14b weight 30 iron-type golf club 40, 50 putter 60 wind generator 61 generator body 62 rotation axis 63 blade 64 wind direction axis (rotation axis) 65 Weight 66 Bar material 70 Generator 71 Rotor 72 Rotation shaft 73 Weight 74 Bar material 80 Conduction shaft mechanism 81 Conduction shaft 82 Weight 83 Bar material 90 Generator 91 Stator 92 Rotor 93 Rotation shaft 100 Gear transmission mechanism 101, 102
Spur gear 103, 104 Rotation shaft 106, 107
Bar 110 Bevel gear transmission mechanism 111, 112
Bevel gears 113,114 rotating shafts 115,116
Weights 117, 118 Weights 120 Torque converter 121 Input shaft (rotary shaft) 122 Output shaft (rotary shaft) 123, 124
Bar 130 Centrifugal dehydrator 131 Center shaft (rotating shaft) 132 Weight 133 Bar 140 Fan mechanism 141 Center shaft (rotating shaft) 142 Bar 150 Rotating door mechanism 151 Rotating shaft 160 Door mechanism 161 Rotating shaft 163 Weight

Claims (11)

[Claims] 1. A rotating body that rotates or rotates around a rotation center, wherein a mass distribution in a radial direction at the time of rotation or rotation is such that a large mass is concentrated in the rotation center and a range immediately adjacent to the rotation center, and A low moment of inertia rotating body, characterized in that a small mass is distributed uniformly or non-uniformly in a distribution other than the rotation center and a region immediately adjacent thereto. 2. The hand-held tool for gripping a handle or handle with one hand or both hands and rotating or rotating the center of rotation of one hand or between both hands, wherein the rotating body includes 2. The low moment of inertia rotating body according to claim 1, wherein a concentrated mass is provided at the rotation center and a portion immediately adjacent to the rotation center. 3. The golf club according to claim 2, wherein the rotating body is a golf club having a center of rotation between both hands holding the grip, and the concentrated mass is provided within a range of 4 cm about the center of rotation of the grip. The described low moment of inertia rotating body. 4. The rotating shaft, wherein the rotating body is rotatably supported by a bearing, and may have a rotating additive.
The low moment of inertia rotating body according to claim 1, wherein a concentrated mass is provided on the rotating shaft along a central axis direction of the rotating shaft. 5. The rotating shaft, wherein the rotating body is rotatably supported by a bearing and may have a rotating addition.
One or a plurality of rods of a predetermined length having an extremely small mass in comparison with the mass of the rotating shaft or the mass of the rotating shaft and the rotation additive are symmetrically mounted on the rotating shaft. The low moment of inertia rotating body according to claim 1, wherein the rotating body is vertically mounted. 6. The rotating shaft, wherein the rotating body is rotatably supported by a bearing and may have a rotating addition.
A plate-like body having a predetermined outer diameter and having a very small mass as compared with the mass of the rotating shaft or the mass of the rotating shaft and the rotation additive is attached to the rotating shaft perpendicularly to the rotating shaft. The low moment of inertia rotating body according to claim 1. 7. A method for reducing the moment of inertia of a rotating body that rotates or rotates around a center of rotation, wherein a weight is added to the center of rotation and a part immediately adjacent to the center of rotation, The mass distribution in the radial direction is such that a large mass is concentrated in the rotation center and a range immediately adjacent to the rotation center, and a distribution in which small mass is uniformly or non-uniformly dispersed in a range other than the rotation center and the vicinity immediately therearound. A method for reducing the moment of inertia of a rotating body, characterized in that the method comprises: 8. A method for reducing the moment of inertia of a rotating body which is rotated or rotated around a center of rotation, wherein one or a plurality of rods of a predetermined length having an extremely small mass are provided at the center of rotation. Attached symmetrically and perpendicularly to the rotation center, the mass distribution in the radial direction at the time of rotation or rotation is such that a large mass is concentrated in the rotation center and a range immediately adjacent to the rotation center, and the rotation center and A method of reducing the moment of inertia of a rotating body, characterized in that a small mass is distributed uniformly or non-uniformly in a range other than the vicinity. 9. A method for reducing a moment of inertia of a rotating body which is rotated or rotated around a center of rotation, wherein the plate-like body having a predetermined outer diameter having an extremely small mass at the center of rotation is provided. Vertically attached to, the mass distribution in the radial direction at the time of rotation or rotation, large mass is concentrated in the range of the rotation center and its immediate vicinity, and in the range other than the rotation center and its immediate vicinity A method of reducing the moment of inertia of a rotating body, characterized in that a small mass is distributed uniformly or non-uniformly. 10. A method for reducing the moment of inertia of a rotating body that rotates or rotates around a center of rotation, wherein a weight is added to the center of rotation and a portion immediately adjacent to the center of rotation, and the center of rotation is extremely reduced. One or a plurality of rods of a predetermined length having a small mass are attached symmetrically and perpendicularly to the rotation center, and the mass distribution at the time of rotation or rotation is adjusted to the rotation center and a range immediately adjacent thereto. A method of reducing the moment of inertia of a rotating body, characterized in that a large mass is concentrated, and a small mass is distributed uniformly or non-uniformly in a range other than the rotation center and its immediate vicinity. 11. A method of reducing the moment of inertia of a rotating body that rotates or rotates around a center of rotation, wherein a weight is added to the center of rotation and a portion immediately adjacent to the center of rotation, and the center of rotation is extremely reduced. A plate-like body having a predetermined outer diameter having a small mass is attached perpendicularly to the rotation center,
In the mass distribution during rotation or rotation, a large mass is concentrated in the above-mentioned rotation center and its immediate vicinity, and a small mass is uniformly or non-uniformly distributed in the area other than the above-mentioned rotation center and its immediate vicinity. A method of reducing the moment of inertia of a rotating body, characterized in that the distribution is adjusted to a predetermined value.