Rotation transmission device and wind power generation device equipped with the same

Patent metadata

Field	Value
Publication number	US-2016195145-A1
Application number	US-201414909684-A
Country	US
Kind code	A1
Filing date	Aug 11, 2014
Priority date	Aug 12, 2013
Publication date	Jul 7, 2016
Grant date	—

Abstract

A rotation transmission device includes a one-way clutch which is provided between an output shaft of a speed increaser and an input shaft of a generator, which makes a connection between the output shaft and the input shaft to be rotatable integrally in a state in which a rotation speed of the output shaft is higher than that of the input shaft, and which cuts off the connection between the output shaft and the input shaft in a state in which the rotation speed of the output shaft is lower than that of the input shaft. The rotation transmission device further includes: a measurement section which measures a state of the one-way clutch which changes depending on a load exerted to the one-way clutch; and an acquisition section which acquires the load exerted to the one-way clutch on a basis of a measurement result of the measurement section.

First claim

1 . A rotation transmission device comprising:
a one-way clutch which is provided between an output shaft of a speed increaser which increases rotation of a main spindle in a wind power generation device and an input shaft of a generator to which rotation of the output shaft is input so as to generate electric power, which makes a connection between the output shaft and the input shaft so as to be rotatable integrally in a state in which a rotation speed of the output shaft is higher than a rotation speed of the input shaft, and which cuts off the connection between the output shaft and the input shaft in a state in which the rotation speed of the output shaft is lower than the rotation speed of the input shaft; a measurement section which measures a state of the one-way clutch which changes depending on a load exerted to the one-way clutch; and an acquisition section which acquires the load exerted to the one-way clutch on a basis of a measurement result of the measurement section.

2 . The rotation transmission device according to claim 1 ,
wherein the one-way clutch comprises:
an inner ring and an outer ring; and
a plurality of engagement elements disposed between the inner ring and the outer ring,
wherein the engagement elements are engaged with the inner ring and the outer ring to make the connection between the output shaft and the input shaft so as to be rotatable integrally, and are released from engagement to cut off the connection, and wherein the measurement section measures a distortion generated in the inner ring or the outer ring by the engagement of the engagement elements.

3 . The rotation transmission device according to claim 1 ,
wherein the one-way clutch comprises:
an inner ring and an outer ring; and
a plurality of engagement elements disposed between the inner ring and the outer ring,
wherein the engagement elements are engaged with the inner ring and the outer ring to make the connection between the output shaft and the input shaft so as to be rotatable integrally, and are released from engagement to cut off the connection, and wherein the measurement section measures a movement amount of the engagement element in a circumferential direction when the engagement element is engaged with inner ring and the outer ring.

4 . The rotation transmission device according to claim 2 ,
wherein the one-way clutch comprises cam faces on an inner peripheral face of the outer ring or an outer peripheral face of the inner ring to form wedge-shaped spaces between the inner ring and the outer ring.

5 . The rotation transmission device according to claim 3 ,
wherein the one-way clutch comprises sprags serving as the engagement elements.

6 . A wind power generation device comprising:
a speed increaser which increases rotation of a main spindle rotated by wind power, and which outputs the rotation from an output shaft; a generator to which the rotation of the output shaft is input through an input shaft thereof to generate electric power; the rotation transmission device according to claim 1 ; and a measurement section which measures an electric load of the generator depending on the load acquired by the acquisition section of the rotation transmission device.

7 . The wind power generation device according to claim 6 , further comprising:
a transmission section which transmits information indicating the state of the one-way clutch or information indicating the load exerted to the one-way clutch to an outside of the wind power generation device.

8 . A rotation transmission device comprising:
a one-way clutch which is provided between an output shaft of a speed increaser which increases rotation of a main spindle rotated by wind power and which outputs the rotation from the output shaft and an input shaft of a generator to which the rotation of the output shaft is input so as to generate electric power, wherein the one-way clutch comprises:
an inner ring provided on one of the output shaft and the input shaft;
an outer ring provided on the other of the output shaft and the input shaft; and
rollers disposed in wedge-shaped spaces between the inner ring and the outer ring,
wherein the one-way clutch makes a connection between the output shaft and the input shaft so as to be rotatable integrally by engaging the rollers with the inner ring and the outer ring in a case in which a rotation speed of the output shaft is higher than a rotation speed of the input shaft, and cuts off the connection by releasing engagement in a case in which the rotation speed of the output shaft is lower than the rotation speed of the input shaft, and wherein the rotation transmission device further comprises a detection mechanism which detects a torsion angle between the inner ring and the outer ring caused by a change in a load torque of the generator.

9 . The rotation transmission device according to claim 8 , further comprising:
a determination section which determines an abrasion state of the inner ring and the outer ring of the one-way clutch on a basis of the torsion angle depending on a change amount of the load torque.

10 . The rotation transmission device according to claim 8 ,
wherein the detection mechanism comprises:
a first detection section which detects an absolute angle of the inner ring;
a second detection section which detects an absolute angle of the outer ring; and
a calculation section which obtains a difference between detection values of the first and second detection sections.

11 . The rotation transmission device according to claim 8 ,
wherein the detection mechanism comprises a detection section which directly detects a change in an angle due to a relative rotation between the inner ring and the outer ring.

12 . The rotation transmission device according to claim 9 , further comprising:
a transmission section which transmits a determination result of the determination section to an outside of the wind power generation device.

13 . A wind power generation device comprising:
a speed increaser which increases rotation of a main spindle rotated by wind power, and which outputs the rotation from the output shaft thereof; a generator to which the rotation of the output shaft is input through an input shaft thereof to generate electric power; and the rotation transmission device according to claim 8 .

14 . The rotation transmission device according to claim 3 ,
wherein the one-way clutch comprises cam faces on an inner peripheral face of the outer ring or an outer peripheral face of the inner ring to form wedge-shaped spaces between the inner ring and the outer ring.

15 . The rotation transmission device according to claim 9 ,
wherein the detection mechanism comprises:
a first detection section which detects an absolute angle of the inner ring;
a second detection section which detects an absolute angle of the outer ring; and
a calculation section which obtains a difference between detection values of the first and second detection sections.

16 . The rotation transmission device according to claim 9 ,
wherein the detection mechanism comprises a detection section which directly detects a change in an angle due to a relative rotation between the inner ring and the outer ring.

Assignees

• Jtekt Corp

Inventors

• Fujiwara Hideki

Classifications

• F16C33/581

  integral with other parts, e.g. with housings or machine elements such as shafts or gear wheels · CPC title

• F16C41/001

  Integrated brakes or clutches for stopping or coupling the relatively movable parts · CPC title

• F03D15/00

  Transmission of mechanical power · CPC title

• F16C19/28

  with two or more rows of rollers · CPC title

• G01L3/1435

  involving magnetic or electromagnetic means · CPC title