Rotation driving mechanism for windmill

Patent metadata

Field	Value
Publication number	US-9790920-B2
Application number	US-201514740895-A
Country	US
Kind code	B2
Filing date	Jun 16, 2015
Priority date	Jun 27, 2014
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

A rotation driving mechanism for windmill ( 1 ) includes an annular track part ( 2 ), a rotation driving part ( 11 ), and a plurality of swinging parts ( 15 ). The annular track part ( 2 ) is disposed on one of a base-side structure and a rotation-side structure, and has a track wall part ( 3 ) and first teeth ( 7 ). The rotation driving part ( 11 ) is fixed on the other of the base-side structure and the rotation-side structure. Each swinging part ( 15 ) has a swinging part body ( 16 a ) and second teeth ( 16 b ). When a rotating shaft ( 13 ) of the rotation driving part ( 11 ) is rotated so that the swinging parts ( 15 ) are swung with maintaining a predetermined phase difference thereamong, the swinging parts ( 15 ) are relatively moved with respect to the annular track part ( 2 ).

First claim

The invention claimed is:

1. A rotation driving mechanism for windmill for use in a windmill including a base-side structure and a rotation-side structure that is rotatable with respect to the base-side structure, so as to rotate the rotation-side structure with respect to the base-side structure, the rotation driving mechanism for windmill comprising:
an annular track part formed in one structure of the base-side structure and the rotation-side structure, the annular track part having a track wall part whose wall surface is directed toward the other structure of the base-side structure and the rotation-side structure, and first teeth that are arranged such that each facewidth direction thereof radially extends along an in-plane direction of the wall surface;
a rotation driving part having a rotatable rotating shaft, the rotation driving part being fixed on the other structure; and
a swinging unit including swinging parts each having a meshing part to be meshed with a part of the first teeth, and a swinging part body provided with the meshing part, wherein the swinging parts are arranged along the facewidth direction of the first teeth, and the swinging unit is configured to be relatively moved with respect to the annular track part in a circumferential direction of the annular track part, when the rotating shaft is rotated so that the swinging parts are swung with maintaining a predetermined phase difference thereamong,
wherein the meshing part includes second teeth to be meshed with the first teeth.

2. The rotation driving mechanism for windmill according to claim 1 , wherein
the first teeth are rotatably held with respect to the track wall part, or the second teeth are rotatably held with respect to the swinging part body.

3. The rotation driving mechanism for windmill according to claim 1 , wherein:
grooves are formed in the wall surface of the track wall part such that the grooves radially extend along the in-plane direction of the wall surface, each groove having a bottom part whose sectional shape in a plane perpendicular to a direction in which the groove extends is circular arc shape; and
each of the first teeth is accommodated in one groove of the grooves such that the facewidth direction of the first tooth extends along the direction in which the groove extends, each of the first teeth being a rod-like member that is rotatable while sliding with respect to the one groove.

4. The rotation driving mechanism for windmill according to claim 3 , wherein:
the first tooth is formed to have a truncated conical shape having a diameter increasing from a radially inside portion toward a radially outside portion, when the first tooth is accommodated in the groove; and
the groove is formed to have a shape corresponding to the first tooth.

5. The rotation driving mechanism for windmill according to claim 1 , wherein
the second tooth is a roller that is rotatable about a shaft part attached to the swinging part body such that an axial direction thereof extends along the facewidth direction of the first tooth.

6. The rotation driving mechanism for windmill according to claim 1 , further comprising:
a plurality of the swinging units; and
a plurality of the rotation driving parts that are correspondingly provided on the respective swinging units, so as to swing the swinging parts of the respective swinging units.

7. The rotation driving mechanism for windmill according to claim 1 , which is used in a tower as the base-side structure, and a nacelle as the rotation-side structure.

Assignees

• Nabtesco Corp

Inventors

• Nohara Osamu
• Asakawa Yuichi

Classifications

• F16H25/02

  the movements of two or more independently moving members being combined into a single movement · CPC title

• Y02E10/722

  Cross-Sectional Technologies · mapped topic

• F03D15/00 Primary

  Transmission of mechanical power · CPC title

• F03D80/88

  of mechanical components · CPC title

• Y02E10/726

  Cross-Sectional Technologies · mapped topic