Planetary gear transmission systems or components – Planetary gearing or element – Nonplanetary gearing combined with planetary
Patent
1991-01-04
1992-09-22
Herrmann, Allan D.
Planetary gear transmission systems or components
Planetary gearing or element
Nonplanetary gearing combined with planetary
74420, 74606R, 244 60, 416170R, F16H 132, F16H 5702, B64C 2712
Patent
active
051493110
ABSTRACT:
In a high-loaded, light-weight, compact, multi-stage gear transmission unit with at least one stage with non-parallel shafts, and a transmission ratio between approximately 70 and 150, like a helicopter transmission, said angle transmission generally forms the weakest link. By adoption of a face gear/cylindrical pinion-stage instead of the commonly used bevelled-stage, not only a more reliable drive is possible, but its efficiency is higher, due to less friction, its size is smaller, its adjustment is simpler such that straight forward replacement becomes possible, and - not in the least - the transmission ratio of said angle drive tends to high ratios in contrast to known bevelled-drives which tend to low ratios. In many cases one or even more stages less become possible, providing a further important reduction in weight and size.
REFERENCES:
patent: 2520887 (1950-08-01), Miller, Jr.
patent: 3129608 (1964-04-01), Watson
patent: 3486832 (1969-12-01), Stone et al.
patent: 4216925 (1980-08-01), Mendiberri
patent: 4484491 (1984-11-01), Cocking
patent: 4489625 (1984-12-01), White
DAF Special Products
Hale John S.
Herrmann Allan D.
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