Bearing for vertical axis windmill and vertical axis wind power generator
In a bearing for vertical axis windmill configured to rotatably support a vertical axis of a vertical axis windmill, the bearing includes a ball ( 7 ), a diameter of the ball and a curvature of a rolling groove of the bearing are set to satisfy a predetermined starting torque and a load rating. For example, the curvature of the rolling groove of the bearing is 54% or more and 100% or less, and the diameter of the ball has a ratio of 20% or less with respect to a vertical shaft ( 2 ).
1. A method of manufacturing a, bearing for a vertical axis windmill, the bearing comprising a bail rolling on a rolling contact groove and being configured to rotatably support a vertical axis of a vertical axis windmill, the method comprising:
defining a ratio of a diameter of the ball with respect to a diameter of the vertical axis as a ratio;
defining a numerical value that is obtained by dividing a rolling contact groove radius by the diameter of the ball as a numerical value;
using a graph which represents the ratio as a vertical axis and represents the numerical value as a horizontal axis, and which includes an area surround by a first relation curve, a second relation curve, and a third relation curve,
the first relation curve showing a relation between the ratio and the numerical value and showing a starting torque obtained from working conditions of the vertical axis windmill,
the second relation curve showing a relation between the ratio and the numerical value and showing a dynamic load rating obtained from working conditions of the vertical axis windmill,
the third relation curve showing a relation between the ratio and the numerical value and showing a static load rating obtained from working conditions of the vertical axis windmill;
determining the ratio within the area as a specified ratio;
determining the numerical value within the area as a specified numerical value; and
manufacturing the bearing by use of the specified ratio and the specified numerical value.
2. The method of manufacturing the bearing for a vertical axis windmill according to claim 1 , wherein the specified numerical value that is obtained by dividing the rolling contact groove radius by the diameter of the ball is determined to be 54% or more and 100% or less.
3. The method of manufacturing bearing for a vertical axis windmill according to claim 2 , wherein the diameter of the ball has a ratio of 20% or less with respect to the diameter of the vertical axis.
4. The method of manufacturing bearing for a vertical axis windmill according to claim 2 , wherein the rolling groove of the ball is formed in an outer circumferential surface of the vertical axis.
5. A method of manufacturing a vertical axis wind power generator, the vertical axis wind power generator comprising:
a windmill configured to rotate around a central shaft extending in a vertical direction;
an axis body configured to be disposed along the central axis and to be connected with the windmill;
a support body configured to rotatably support the axis body around the central axis via a bearing for a vertical axis windmill; and
a power generator configured to generate electric power by rotation of the axis body, the method comprising:
manufacturing the bearing by the method according to claim 2 .
6. The method of manufacturing bearing for a vertical axis windmill according to claim 1 , wherein the diameter of the ball has a ratio of 20% or less with respect to the diameter of the vertical axis.
7. The method of manufacturing bearing for a vertical axis windmill according to claim 6 , wherein the rolling groove of the ball is formed in an outer circumferential surface of the vertical axis.
8. A method of manufacturing a vertical axis wind power generator, the vertical axis wind power generator comprising:
a windmill configured to rotate around a central shaft extending in a vertical direction;
an axis body configured to be disposed along the central axis and to be connected with the windmill;
a support body configured to rotatably support the axis body around the central axis via a bearing for a vertical axis windmill; and
a power generator configured to generate electric power by rotation of the axis body,
the method comprising:
manufacturing the bearing by the method according to claim 6 .
9. The method of manufacturing bearing for a vertical axis windmill according to claim 1 , wherein the rolling groove of the ball is formed in an outer circumferential surface of the vertical axis.
10. A method of manufacturing a vertical axis wind power generator, the vertical axis wind power generator comprising:
a windmill configured to rotate around a central shaft extending in a vertical direction;
an axis body configured to be disposed along the central axis and to be connected with the windmill;
a support body configured to rotatably support the axis body around the central axis via a bearing for a vertical axis windmill; and
a power generator configured to generate electric power by rotation of the axis body,
the method comprising:
manufacturing the bearing by the method according to claim 9 .
11. A method of manufacturing a vertical axis wind power generator, the vertical axis wind power generator comprising:
a windmill configured to rotate around a central shaft extending in a vertical direction;
an axis body configured to be disposed along the central axis and to be connected with the windmill;
a support body configured to rotatably support the axis body around the central axis via a bearing for a vertical axis windmill; and
a power generator configured to generate electric power by rotation of the axis body,
the method comprising:
manufacturing the bearing by the method according to claim 1 .