Patent ID: 6626059
Filing Date: 2003-09-30
Classification: B64C,F16H,Y10T

Abstract:
A transmission (30) for a helicopter rotor drive having at least one prime mover provided with at least first and second power transmission branches, a housing (40) accommodating the first and second power transmissions, the first power transmission branch having a first rotatable driving pinion (6) in constant engagement with a first toothed output gear (2) and the second power transmission branch having a second driving pinion (8) in constant engagement with a second toothed output gear (4), co-axial with the first toothed output gear (2), and the first and second driving pinions (6, 8) being located adjacent one another;wherein a first pinion shaft (10) interconnects the first driving pinion (6) with an interconnecting point (16) and a second pinion shaft (12) interconnects the second driving pinion (8) with the interconnecting point (16), whereby the first and second toothed output gears (2, 4) are non-rotatably interconnected with one another, said first and second pinion shafts (10, 12) are torsionally elastic such that a ratio of torsional resistance of said first and second pinion shafts (10, 12) substantially corresponds to a rolling radial ratio of the associated driving pinions (6, 8), and a first end of the first pinion shaft (10) is supported by a first bearing (62) and a second opposed end of the first pinion shaft (10) is supported by a second bearing (64), with the first and second driving pinions (6, 8) located between the first and second bearings (62, 64), to facilitate rotation of the first and second pinion shafts (10, 12) relative to the housing (40); and said second driving pinion (8) of said second pinion shaft (12) is support upon said first pinion shaft (10) by a sliding bearing, and the sliding bearing has races (42) which are integrated radially within said second driving pinion (8) and said first pinion shaft (10).