公开(公告)号：DE3110263A1

公开(公告)日：1982-03-25

申请号：DE3110263

申请日：1981-03-17

Applicant: UNITED TECHNOLOGIES CORP

Inventor： BARNES PHILIP EARL ,  MAYO MILLARD GIRARD ,  SHERMAN ROBERT

IPC: F03D7/04 ,  F03D7/02 ,  F03D1/06 ,  B64C11/38

Abstract: A pitch control system for a multibladed variable pitch wind turbine. Each of the turbine blades is pivotally driven about the longitudinal axis thereof independently of the other blades by at least a pair of hydraulic actuators. The actuators are supplied with pressurized hydraulic fluid from a first source thereof under conditions of normal pitch change adjustment. Under conditions wherein feathering of the blades is required, the actuators are supplied with hydraulic fluid from second sources thereof such that one of the actuators associated with each of the blades is supplied with fluid from one second source and a second actuator is provided with fluid from a redundant second source whereby blade feathering may be effected despite a malfunction of one of the redundant sources or one of the actuators. In one of the two preferred embodiments disclosed, the first and second fluid sources are maintained in mutual communication whereby fluid from the second sources thereof may supplement fluid from the first source under conditions of normal blade pitch adjustment.

公开(公告)号：FI810813L

公开(公告)日：1981-09-18

申请号：FI810813

申请日：1981-03-16

Applicant: UNITED TECHNOLOGIES CORP

Inventor： SHERMAN ROBERT ,  BARNES PHILIP EARL ,  MAYO MILLARD GIRARD

IPC: F03D7/04 ,  F03D7/02 ,  F03D

Abstract: A pitch control system for a multibladed variable pitch wind turbine. Each of the turbine blades is pivotally driven about the longitudinal axis thereof independently of the other blades by at least a pair of hydraulic actuators. The actuators are supplied with pressurized hydraulic fluid from a first source thereof under conditions of normal pitch change adjustment. Under conditions wherein feathering of the blades is required, the actuators are supplied with hydraulic fluid from second sources thereof such that one of the actuators associated with each of the blades is supplied with fluid from one second source and a second actuator is provided with fluid from a redundant second source whereby blade feathering may be effected despite a malfunction of one of the redundant sources or one of the actuators. In one of the two preferred embodiments disclosed, the first and second fluid sources are maintained in mutual communication whereby fluid from the second sources thereof may supplement fluid from the first source under conditions of normal blade pitch adjustment.

公开(公告)号：NO157793C

公开(公告)日：1988-05-25

申请号：NO810843

申请日：1981-03-12

Applicant: UNITED TECHNOLOGIES CORP

Inventor： BARNES PHILIP EARL ,  MAYO MILLARD GIRARD ,  SHERMAN ROBERT

IPC: F03D7/04 ,  F03D7/02

Abstract: A pitch control system for a multibladed variable pitch wind turbine. Each of the turbine blades is pivotally driven about the longitudinal axis thereof independently of the other blades by at least a pair of hydraulic actuators. The actuators are supplied with pressurized hydraulic fluid from a first source thereof under conditions of normal pitch change adjustment. Under conditions wherein feathering of the blades is required, the actuators are supplied with hydraulic fluid from second sources thereof such that one of the actuators associated with each of the blades is supplied with fluid from one second source and a second actuator is provided with fluid from a redundant second source whereby blade feathering may be effected despite a malfunction of one of the redundant sources or one of the actuators. In one of the two preferred embodiments disclosed, the first and second fluid sources are maintained in mutual communication whereby fluid from the second sources thereof may supplement fluid from the first source under conditions of normal blade pitch adjustment.

公开(公告)号：NO157793B

公开(公告)日：1988-02-08

申请号：NO810843

申请日：1981-03-12

Applicant: UNITED TECHNOLOGIES CORP

Inventor： BARNES PHILIP EARL ,  MAYO MILLARD GIRARD ,  SHERMAN ROBERT

IPC: F03D7/04 ,  F03D7/02

Abstract: A pitch control system for a multibladed variable pitch wind turbine. Each of the turbine blades is pivotally driven about the longitudinal axis thereof independently of the other blades by at least a pair of hydraulic actuators. The actuators are supplied with pressurized hydraulic fluid from a first source thereof under conditions of normal pitch change adjustment. Under conditions wherein feathering of the blades is required, the actuators are supplied with hydraulic fluid from second sources thereof such that one of the actuators associated with each of the blades is supplied with fluid from one second source and a second actuator is provided with fluid from a redundant second source whereby blade feathering may be effected despite a malfunction of one of the redundant sources or one of the actuators. In one of the two preferred embodiments disclosed, the first and second fluid sources are maintained in mutual communication whereby fluid from the second sources thereof may supplement fluid from the first source under conditions of normal blade pitch adjustment.

公开(公告)号：IT8121295D0

公开(公告)日：1981-04-21

申请号：IT2129581

申请日：1981-04-21

Applicant: UNITED TECHNOLOGIES CORP

Inventor： BARNES PHILIP EARL ,  MAYO MILLARD GIRARD

IPC: F16H1/22 ,  F16H1/26 ,  F16H

Abstract: Where a single output gear is driven from a single input pinion through a pair of idler gears and equal torque division between the two idlers is accomplished by floating the input pinion between the two idlers in a yoke that is hinged to the gear housing by spaced hinge pins. One hinge pin is located on the resultant load line from the points where the pinion meshes with the idlers and the other pin has a small clearance to allow the yoke to pivot about the first or loaded pin. Lubrication by oil under pressure for both pins assures a damping action at the loose pin.

公开(公告)号：IT8120376D0

公开(公告)日：1981-03-17

申请号：IT2037681

申请日：1981-03-17

Applicant: UNITED TECHNOLOGIES CORP

Inventor： SHERMAN ROBERT ,  BARNES PHILIP EARL ,  MAYO MILLARD GIRARD

IPC: F03D7/04 ,  F03D7/02 ,  F03D

Abstract: A pitch control system for a multibladed variable pitch wind turbine. Each of the turbine blades is pivotally driven about the longitudinal axis thereof independently of the other blades by at least a pair of hydraulic actuators. The actuators are supplied with pressurized hydraulic fluid from a first source thereof under conditions of normal pitch change adjustment. Under conditions wherein feathering of the blades is required, the actuators are supplied with hydraulic fluid from second sources thereof such that one of the actuators associated with each of the blades is supplied with fluid from one second source and a second actuator is provided with fluid from a redundant second source whereby blade feathering may be effected despite a malfunction of one of the redundant sources or one of the actuators. In one of the two preferred embodiments disclosed, the first and second fluid sources are maintained in mutual communication whereby fluid from the second sources thereof may supplement fluid from the first source under conditions of normal blade pitch adjustment.