FR2354922A1 - Helicopter rotor drive transmission - has freewheel coupling for lift and tail rotor drives allowing auto-gyration on engine failure - Google Patents

Helicopter rotor drive transmission - has freewheel coupling for lift and tail rotor drives allowing auto-gyration on engine failure

Info

Publication number
FR2354922A1
FR2354922A1 FR7618086A FR7618086A FR2354922A1 FR 2354922 A1 FR2354922 A1 FR 2354922A1 FR 7618086 A FR7618086 A FR 7618086A FR 7618086 A FR7618086 A FR 7618086A FR 2354922 A1 FR2354922 A1 FR 2354922A1
Authority
FR
France
Prior art keywords
engine failure
gyration
lift
drive transmission
drive shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
FR7618086A
Other languages
French (fr)
Other versions
FR2354922B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ETUDES RECH AVANCEES
Original Assignee
ETUDES RECH AVANCEES
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ETUDES RECH AVANCEES filed Critical ETUDES RECH AVANCEES
Priority to FR7618086A priority Critical patent/FR2354922A1/en
Publication of FR2354922A1 publication Critical patent/FR2354922A1/en
Application granted granted Critical
Publication of FR2354922B1 publication Critical patent/FR2354922B1/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C27/00—Rotorcraft; Rotors peculiar thereto
    • B64C27/04—Helicopters
    • B64C27/12—Rotor drives

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Gear Transmission (AREA)

Abstract

The transmission coupling consists of an input shaft (1) rotated by the helicopter motor, which transmits the rotation through reduction gearing to the drive shaft (2) of the lifting rotor and to the drive shaft (3) of the tail rotor. The output shaft of the reduction gear (4) drives a shaft (5) on which is mounted a free wheel (6) permitting a coupling between two rotating pieces in one sense of rotation only. On the exterior crown of the free wheel is a toothed wheel (7), which drives a reduction gear (8) attached to the drive shaft of the lifting rotor, and a conical cog (9a) which drives a conical gear (9b) on the drive shaft of the tail rotor. The free wheel allows autogyration of the rotors in the event of engine failure.
FR7618086A 1976-06-15 1976-06-15 Helicopter rotor drive transmission - has freewheel coupling for lift and tail rotor drives allowing auto-gyration on engine failure Granted FR2354922A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7618086A FR2354922A1 (en) 1976-06-15 1976-06-15 Helicopter rotor drive transmission - has freewheel coupling for lift and tail rotor drives allowing auto-gyration on engine failure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7618086A FR2354922A1 (en) 1976-06-15 1976-06-15 Helicopter rotor drive transmission - has freewheel coupling for lift and tail rotor drives allowing auto-gyration on engine failure

Publications (2)

Publication Number Publication Date
FR2354922A1 true FR2354922A1 (en) 1978-01-13
FR2354922B1 FR2354922B1 (en) 1979-04-06

Family

ID=9174378

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7618086A Granted FR2354922A1 (en) 1976-06-15 1976-06-15 Helicopter rotor drive transmission - has freewheel coupling for lift and tail rotor drives allowing auto-gyration on engine failure

Country Status (1)

Country Link
FR (1) FR2354922A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4659286A (en) * 1984-05-14 1987-04-21 Costruzioni Aeronautiche Giovanni Agusta S.P.A. Main helicopter drive
US4983153A (en) * 1985-12-18 1991-01-08 Daf Special Products Gear unit, particularly for use in a helicopter
WO1994000347A2 (en) * 1992-06-22 1994-01-06 United Technologies Corporation An unmanned aerial vehicle having ducted, coaxial counter-rotating rotors

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111483591B (en) * 2020-04-24 2022-04-05 中国航发湖南动力机械研究所 Tail speed reducer casing and heavy-load tail speed reducer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4659286A (en) * 1984-05-14 1987-04-21 Costruzioni Aeronautiche Giovanni Agusta S.P.A. Main helicopter drive
US4983153A (en) * 1985-12-18 1991-01-08 Daf Special Products Gear unit, particularly for use in a helicopter
WO1994000347A2 (en) * 1992-06-22 1994-01-06 United Technologies Corporation An unmanned aerial vehicle having ducted, coaxial counter-rotating rotors
WO1994000347A3 (en) * 1992-06-22 1994-07-07 United Technologies Corp An unmanned aerial vehicle having ducted, coaxial counter-rotating rotors
EP0861775A1 (en) * 1992-06-22 1998-09-02 United Technologies Corporation A coaxial transmission/center hub subassembly for a rotor assembly

Also Published As

Publication number Publication date
FR2354922B1 (en) 1979-04-06

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Legal Events

Date Code Title Description
ST Notification of lapse