Machine element or mechanism – Gearing – Directly cooperating gears
Patent
1992-05-05
1993-01-12
Braun, Leslie A.
Machine element or mechanism
Gearing
Directly cooperating gears
74661, 74665B, 74665D, 74665GC, F16H 3706
Patent
active
051780283
ABSTRACT:
A gear arrangement for an offset transmission includes two concentric, counter-rotating face gears in meshing engagement with an engine output shaft, the face gears being connected to respective concentric, vertical counter rotating face gear shafts of unequal length, each shaft ending in a helical spur gear that is in meshing engagement with an output helical face gear. The helical output face gear is connected to the output shaft, thereby completing the offset transmission. The face gear shafts can be coupled together by means of thrust bearings that couple the axial thrusts of one shaft to the other in an opposite direction. The shafts can also be coupled via a preload spring that ensures the torque split between the pinion gears is statically determinant. The gear arrangement can be applied to twin engine designs, with a spur gear train coupling the two engines together via an interconnect shaft.
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Robert C. Bill, Advanced Rotorcraft Transmission Program, pp. 229, 237, presented at 46th Annual Forum of American Helicopter Society, May 21-23, 1990, Washington, D.C.
D. G. Lewicki, AVSCOM Technical Memorandum 90-C-006, pp. 4, 5 presented at Helicopter Transmission Design and Maintenance Workshop, May 21-25, 1990, Quebec City, Canada.
Braun Leslie A.
Lucas Western Inc.
Trousdell William O.
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