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公开(公告)号：WO9956912A8
公开(公告)日：1999-12-09
申请号：PCT/US9909431
申请日：1999-04-29
Applicant: UNITED TECHNOLOGIES CORP
Inventor： PRUDEN ROBERT W , CARVALHO PAUL A
Abstract: A system (10) for controlling propeller blade pitch is disclosed. The system (10) comprises a transfer tube (18), wherein the transfer tube (18) defines an element of the rotatable portion (12) and wherein the transfer tube (18) is non-translating relative the rotatable (12) and non-rotatable portions (26). A transfer bearing (16) for providing hydraulic fluid to and interfacing with the transfer tube (18) is also used, wherein the transfer bearing (16) is located on the non-rotatable portion (26). The system further includes a pitch change actuator (22) and a mechanism form (74) for actuating the pitch change actuator (22), wherein the mechanism (74) is fluidically connected to and translatable relative to the transfer tube (18). A device for measuring blade angle of the propeller blade (120) is also provided, wherein the device is separate and distinct from the transfer tube (18).
Abstract translation: 公开了一种用于控制螺旋桨叶片螺距的系统（10）。 所述系统（10）包括传输管（18），其中所述传输管（18）限定所述可旋转部分（12）的元件，并且其中所述传输管（18）相对于所述可旋转部分（12） - 可旋转部分（26）。 还使用了用于向传送管18提供液压流体并与传送管18接口的传送轴承16，其中传送轴承16位于不可旋转部分26上。 该系统还包括变桨致动器（22）和用于致动变桨致动器（22）的机构形式（74），其中机构（74）流体连接到并且相对于传输管（18）可平移。 还提供了一种用于测量螺旋桨叶片（120）的叶片角度的装置，其中该装置与传送管（18）分离且不同。
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公开(公告)号：DE69936849D1
公开(公告)日：2007-09-27
申请号：DE69936849
申请日：1999-04-29
Applicant: UNITED TECHNOLOGIES CORP
Inventor： PRUDEN ROBERT W , CARVALHO PAUL A
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公开(公告)号：AU2087101A
公开(公告)日：2001-07-03
申请号：AU2087101
申请日：2000-12-11
Applicant: UNITED TECHNOLOGIES CORP
Inventor： PRUDEN ROBERT W , CARVALHO PAUL A
Abstract: A pressure relief device for preventing over pressurization of a propeller hub is disclosed. The pressure relief devices is designed to fit within a ball hole opening in the hub arm of the hub. The pressure relief device includes a housing which sealably interfaces with an inner wall of the ball hole opening and a pressure relief insert which sealably interfaces with the housing. The pressure relief device includes a plurality of fracture tabs which engage an end of the housing exposed to hub cavity pressure. The fracture tabs are designed to break at a design pressure allowing the pressure relief insert to be forced out of the housing thus breaking the seal between the pressure relief insert and housing thereby venting the hub cavity.
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公开(公告)号：CA2008792A1
公开(公告)日：1990-09-07
申请号：CA2008792
申请日：1990-01-29
Applicant: UNITED TECHNOLOGIES CORP
Inventor： CARVALHO PAUL A
Abstract: Variable Propeller System Incorporating a Forward Transfer Bearing Hydraulic fluid is input to a transfer tube of a variable pitch propeller system forward of a rotatable portion of a controller. A transfer bearing is provided about the drive shaft to transfer hydraulic fluid therethrough and between the drive shaft and the transfer tube to transfer hydraulic fluid from the drive shaft into the transfer tube, such transfer bearing allowing relative rotation between the housing and the drive shaft and between the drive shaft and the transfer tube. The transfer tube is slideably connected to the rotatable portion of the controller.
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公开(公告)号：GB2313415B
公开(公告)日：1998-05-20
申请号：GB9713488
申请日：1994-11-28
Applicant: UNITED TECHNOLOGIES CORP
Inventor： CARVALHO PAUL A , GAMES JOHN E
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Patent Agency Ranking
公开(公告)号：GB2285098B
公开(公告)日：1998-05-20
申请号：GB9424001
申请日：1994-11-28
Applicant: UNITED TECHNOLOGIES CORP
Inventor： CARVALHO PAUL A , GAMES JOHN E , BONNANZIO RICHARD L
Abstract: Pitch change for a variable pitch propeller or fan of the type utilized in a gas turbine engine is effectuated by the unique application of a bidirectional electrical induction AC motor and an electrical DC induction brake operatively connected to the pitch change actuator. The motor can be utilized in a slip speed range encompassing from a positive slip speed to zero slip speed and negative slip speeds which removes the limitations on the gear ratio.
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公开(公告)号：GB2313415A
公开(公告)日：1997-11-26
申请号：GB9713488
申请日：1994-11-28
Applicant: UNITED TECHNOLOGIES CORP
Inventor： CARVALHO PAUL A , GAMES JOHN E
Abstract: Pitch change of a propeller or fan is effected by means of a DC induction brake 64 and a bidirectional AC induction motor 62, pitch change drive being transmitted to the blades 18, via a ball screw 26. At relatively low speeds of propeller/fan rotation control means 80, receiving inputs from a lever 82, sequentially controls the brake and the motor to increase pitch at a relatively high beta rate, while at relatively high speeds of rotation, the brake is controlled to increase pitch at a relatively low beta rate. Pitch is decreased at low speeds of rotation by the motor, and at high speeds of rotation by the motor or brake or a combination of the two. The motor can be used in a slip speed range from positive through zero to negative slip speeds.
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公开(公告)号：BR9000999A
公开(公告)日：1991-02-19
申请号：BR9000999
申请日：1990-03-02
Applicant: UNITED TECHNOLOGIES CORP
Inventor： CARVALHO PAUL A
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公开(公告)号：BR8905274A
公开(公告)日：1990-05-22
申请号：BR8905274
申请日：1989-10-17
Applicant: UNITED TECHNOLOGIES CORP
Inventor： MAYO MILLARD G , HUSIAK EDWARD H , BARNES PHILIP E , CARVALHO PAUL A
Abstract: A propeller system has a pair of hub assemblies (12,14) driven in counter-rotation, each hub assembly having a mechanical pitch change actuator (18,20), each actuator being provided with a pitch lock (60) that rotates simultaneously with the motion of the actuator to allow the actuator to set propeller blade pitch, but locks the propeller blade positionally when not rotating simultaneously with the actuator, and a differential for transmitting a pitch change signal across a rotating gap between the two hub assemblies and for providing power to a means for providing the pitch change signals. A pair of motors (112,114) provide the rotative signal to set the pitch of the blades in each hub assembly. One of the pair of motors drives the actuator towards high pitch and the other motor drives the actuator towards low pitch. A synchronizer (76) coordinates the signals of the first and second motors so that a pitch lock moves simultaneously with the actuator.
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公开(公告)号：GB2284863B
公开(公告)日：1997-07-09
申请号：GB9423639
申请日：1994-11-23
Applicant: UNITED TECHNOLOGIES CORP
Inventor： CARVALHO PAUL A
Abstract: The pitch of either a fan or propeller driven by a gas turbine engine is changed by utilizing a pair of impulse turbines interfacing between the stationary and rotating portion of the fan or propeller and utilizing a servo control responding to a desired pitch input signal for actuating the normally inactive impulse turbines during fixed pitch to drive the impulse turbine which in turn is operatively connected through a pitch change actuator to change the pitch in accordance with the input signal.
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