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公开(公告)号：DE69002523T2
公开(公告)日：1993-12-09
申请号：DE69002523
申请日：1990-04-12
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DUCHESNEAU JEROME G
Abstract: A self-locking pitch change actuator is configured to fit within an annular hub (34). A ring gear (40) is driven circumferentially by a tangentially oriented ballscrew (42) and traveler (44). The ballscrew (42) is driven by a hydraulic motor (50) controlled responsive to an electric pitch change motor (74). A pitchlock (62) is positioned by the collective actions of the ballscrew (42) and pitch change motor (74), with any movement relative to a preselected null position driving the hydraulic motor beta control valve (60) into an operative position.
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公开(公告)号：DE69002523D1
公开(公告)日：1993-09-09
申请号：DE69002523
申请日：1990-04-12
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DUCHESNEAU JEROME G
Abstract: A self-locking pitch change actuator is configured to fit within an annular hub (34). A ring gear (40) is driven circumferentially by a tangentially oriented ballscrew (42) and traveler (44). The ballscrew (42) is driven by a hydraulic motor (50) controlled responsive to an electric pitch change motor (74). A pitchlock (62) is positioned by the collective actions of the ballscrew (42) and pitch change motor (74), with any movement relative to a preselected null position driving the hydraulic motor beta control valve (60) into an operative position.
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公开(公告)号：CA1246519A
公开(公告)日：1988-12-13
申请号：CA462199
申请日：1984-08-30
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DUCHESNEAU JEROME G , SCHWARTZ ROBERT A
Abstract: Pitch Control System For Variable Pitch Propeller A propeller pitch control system having a mechanical low pitch stop which includes an electrical backup therefor. The backup comprises an electrically operatable means (245) to effect blade pitch adjustment toward feather under conditions of failure of the low pitch stop indicated by propeller operation at pitch angles in the range of beta operation, but power settings in the range of normal engine speed governor pitch control. Such operating conditions actuate a pair of switches (190 and 195) connecting the means (245) to a voltage source to increase blade pitch toward feather, thereby preventing overspeed operation of the propeller.
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公开(公告)号：CA2013856A1
公开(公告)日：1990-10-21
申请号：CA2013856
申请日：1990-04-04
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DUCHESNEAU JEROME G
Abstract: A self-locking pitch change actuator is configured to fit within an annular hub (34). A ring gear (40) is driven circumferentially by a tangentially oriented ballscrew (42) and traveler (44). The ballscrew (42) is driven by a hydraulic motor (50) controlled responsive to an electric pitch change motor (74). A pitchlock (62) is positioned by the collective actions of the ballscrew (42) and pitch change motor (74), with any movement relative to a preselected null position driving the hydraulic motor beta control valve (60) into an operative position.
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公开(公告)号：CA1208993A
公开(公告)日：1986-08-05
申请号：CA440572
申请日：1983-11-07
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DUCHESNEAU JEROME G , SCHWARTZ ROBERT A
Abstract: Pitch Control System For Variable Pitch Propeller A pitch control system (10) for a variable pitch propeller effects engine governor (330), control of blade pitch under normal operating conditions and automatically effects direct (beta) control of blade pitch by the power lever (305) throughout a predetermined range of power lever settings, The system is hydromechanical and comprises a pitch actuator (40) and a pair of control valves (120 and 210), a first of the valves (120) applying a metered fluid pressure from a governor controlled pilot valve to the actuator and blocking that signal and replacing it with a supply fluid pressure at the point of transition from governor to beta control. The second control valve (210) effects a controlled draining of the actuator and connection thereof with the power lever (305).
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Patent Agency Ranking
公开(公告)号：ES2019846T3
公开(公告)日：1993-12-16
申请号：ES90630090
申请日：1990-04-12
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DUCHESNEAU JEROME G
Abstract: A self-locking pitch change actuator is configured to fit within an annular hub (34). A ring gear (40) is driven circumferentially by a tangentially oriented ballscrew (42) and traveler (44). The ballscrew (42) is driven by a hydraulic motor (50) controlled responsive to an electric pitch change motor (74). A pitchlock (62) is positioned by the collective actions of the ballscrew (42) and pitch change motor (74), with any movement relative to a preselected null position driving the hydraulic motor beta control valve (60) into an operative position.
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公开(公告)号：BR9007949A
公开(公告)日：1992-10-27
申请号：BR9007949
申请日：1990-12-05
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DUCHESNEAU JEROME G , SCHWARTZ ROBERT A
IPC: B64C11/38
Abstract: A pitch control system has a main electronic control, a mechanical back-up control and a switching system for transferring pitch control from the electronic to the mechanical control in the event of electronic control failure. The switching system utilizes a switch for comparing the output of the electronic and mechanical control systems, the switch choosing the mechanical system if a failure occurs in the electronic control system. In certain failure modes, an enable solenoid simultaneously locks out the switch, to ensure mechanical pitch change control, and resets the mechanical back-up control to provide a lower degree of pitch control than conventional back-up controllers.
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公开(公告)号：CA1227386A
公开(公告)日：1987-09-29
申请号：CA455760
申请日：1984-06-04
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DUCHESNEAU JEROME G , SCHWARTZ ROBERT A
Abstract: Engine Speed Control in Propeller Pitch Control Systems In a propeller pitch control system, a selector 10 isolates engine (42) speed control in one of two engine governor (175 and 300) systems. The selector is input with fluid pressure signals from a pair of pilot valves (215 and 325), each operated by a corresponding one of the governors. The selector passes the signal of lowest magnitude to an actuator 40 which sets blade pitch in accordance with the magnitude of the signal whereby the governor providing such signal (through its associated pilot valve) controls engine speed independently of the other governor.
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公开(公告)号：CA2013856C
公开(公告)日：1995-07-18
申请号：CA2013856
申请日：1990-04-04
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DUCHESNEAU JEROME G
Abstract: A self-locking pitch change actuator is configured to fit within an annular hub (34). A ring gear (40) is driven circumferentially by a tangentially oriented ballscrew (42) and traveler (44). The ballscrew (42) is driven by a hydraulic motor (50) controlled responsive to an electric pitch change motor (74). A pitchlock (62) is positioned by the collective actions of the ballscrew (42) and pitch change motor (74), with any movement relative to a preselected null position driving the hydraulic motor beta control valve (60) into an operative position.
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公开(公告)号：ES2019846A4
公开(公告)日：1991-07-16
申请号：ES90630090
申请日：1990-04-12
Applicant: UNITED TECHNOLOGIES CORP
Inventor： DUCHESNEAU JEROME G
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