Stepwise variable speed planetary drive
This patent describes a stepwise variable speed mechanical transmission apparatus comprising in combination: a housing; a first shaft rotatably mount in the housing; a second shaft disposed in line with the first shaft and rotatably mount in the housing, the second shaft including a first rotary member nonrotatably and coaxially affixed to the second shaft; a second rotary member disposed in a parallel and eccentric arrangement with respect to the central axis of the first shaft; a hollow cylindrical member disposed within the housing and enclosing the second rotary member the hollow cylindrical member being axially shiftable in a direction parallel to the central axis of the first shaft; an internal generally circular cylindrical traction surface included in the second rotary member in a coaxial arrangement with respect to the central axis of the second rotary member; a plurality of external generally circular cylindrical traction surfaces of various pitch diameters; and means for shifting and retaining the hollow cylindrical member to and at each of the various shift positions wherein only one of the plurality of external generally circular cylindrical traction surfaces engages only one of the plurality of internal generally circular cylindrical traction surfaces at each of the various shift positions.
- Assignee:
- NOV; EDB-89-084513; NOV-89-056028
- Patent Number(s):
- US 4807494
- OSTI ID:
- 6002891
- Country of Publication:
- United States
- Language:
- English
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