Torque limiter, wind turbine and wind turbine generator

摘要

In a torque limiter, wedge-shaped spaces are formed between inner and outer rings so as to be arranged in the circumferential direction. In each wedge-shaped space, there are arranged a first roller and a second roller that transmit torque between the inner and outer rings by being brought into wedge-engagement when the inner and outer rings rotate relative to each other in one direction and in the other direction, respectively. Between the first and second rollers, there is arranged an urging device that urges the first and second rollers in such directions that the first and second rollers are brought into wedge-engagement. Each wedge-shaped space is formed such that when the torque becomes equal to or higher than a predetermined value, a first wedge angle of the first roller or a second wedge angle of the second roller becomes such an angle that wedge-engagement of the roller is cancelled.

主权项

1. A torque limiter, comprising:
an inner ring; an outer ring; cam faces that are formed on one of an outer peripheral face of the inner ring and an inner peripheral face of the outer ring, and that define, in cooperation with the other one of the outer peripheral face of the inner ring and the inner peripheral face of the outer ring, a plurality of wedge-shaped spaces arranged in a circumferential direction, in each of which a clearance in a radial direction between the inner ring and the outer ring gradually becomes smaller toward each of both sides of the wedge-shaped space in the circumferential direction; first rollers each of which is arranged in a corresponding one of the wedge-shaped spaces and transmits a first torque between the inner ring and the outer ring by being brought into wedge-engagement with the inner ring and the outer ring, at one side in the wedge-shaped space in the circumferential direction when the inner ring and the outer ring rotate relative to each other in one direction; second rollers each of which is arranged in a corresponding one of the wedge-shaped spaces and transmits a second torque between the inner ring and the outer ring by being brought into wedge-engagement with the inner ring and the outer ring, at the other side in the wedge-shaped space in the circumferential direction when the inner ring and the outer ring rotate relative to each other in the other direction that is a direction opposite to the one direction; and urging devices each of which is arranged between a corresponding one of the first rollers and a corresponding one of the second rollers, and urges the first roller and the second roller in such directions that the first roller and the second roller are brought into the wedge-engagement, wherein each of the wedge-shaped spaces is formed such that when the first torque becomes higher than or equal to a predetermined value, a first wedge angle of the first roller becomes such an angle that the wedge-engagement of the first roller is cancelled, and when the second torque becomes higher than or equal to the predetermined value, a second wedge angle of the second roller becomes such an angle that the wedge-engagement of the second roller is cancelled, at the one side in the circumferential direction, of a portion of one of the outer peripheral face of the inner ring and the inner peripheral face of the outer ring, the portion facing a corresponding one of the cam faces, there is formed a first protruded portion that is protruded into a corresponding one of the wedge-shaped spaces and that has a first arc face having a curvature greater than a curvature of the one of the outer peripheral face of the inner ring and the inner peripheral face of the outer ring, and at the other side in the circumferential direction, of a portion of the one of the outer peripheral face of the inner ring and the inner peripheral face of the outer ring, the portion facing a corresponding one of the cam faces, there is formed a second protruded portion that is protruded into a corresponding one of the wedge-shaped spaces and that has a second arc face having a curvature greater than the curvature of the one of the outer peripheral face of the inner ring and the inner peripheral face of the outer ring.