Machine element or mechanism – Gearing – Teeth
Patent
1991-06-04
1992-01-28
Wright, Dirk
Machine element or mechanism
Gearing
Teeth
74462, F16H 5514, F16H 5506
Patent
active
050834746
ABSTRACT:
The usual expedient employed by gear designers seeking to reduce gear noise at all loads has been to specify finer teeth, which in effect trades away torgue capacity for quietness. The present disclosure describes a tooth form that substantially eliminates gear noise while at the same time significantly increasing torque capacity. This tooth form involves (a) the synchronization of the loading and unloading phases of tooth engagement with the inverse phases (i.e., unloading and loading phases, respectively) of another tooth pair, combined with (b) the introduction of particular patterns of topographic tooth surface crowning that transform the elastic tooth pair stiffness curve into a curve that not only maintains this synchronization at loads greater or smaller than the design load but also eliminates transmission error to any extent desired. As neither feature (a) nor (b) requires fine teeth, the tooth form may be employed with any number of teeth, and this allows specification of the "critical tooth number" that maximizes torque capacity.
REFERENCES:
patent: 4276785 (1981-07-01), Rouverol
patent: 4644814 (1987-02-01), Rouverol
patent: 4651588 (1987-03-01), Rouverol
patent: 4899609 (1990-02-01), Nagata
"Profile Modification to Minimize Spur Gear Dynamic Loading", Lin et al., NASA TM89901, 9/88.
"The Reduction of Gear Pair Transmission Error by Minimizing Mesh Stiffness Variation", Rouverol et al., AGMA 88FTM 11, 10/88.
"Design of High Contact Ratio Gears", Rosen et al., J. Am. Helicopter Society, 27M4, 10/82.
Axicon Gear Company
Wright Dirk
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