Back to results
US 4,132,131 AGranted
Free-floating planetary transmission with contra-rotating dual output shafts
AssigneeCurtiss-Wright Corporation
InventorNeil A. DeBruyne
Life of this patent
Estimating the term…
Abstract
A transmission having free-floating, compound, planetary gears in which the net moment tending to tilt each compound planetary gear out of its radial plane is substantially zero and in which said transmission provides contra-rotating dual output shafts and/or said transmission is capable of having multiple inputs.
Claims12
A transmission comprising:
- (a) a set of free-floating planetary elements spaced circumferentially about the transmission axis and each having a spindle disposed parallel to said axis;
- (b) a plurality of axially-spaced rings co-axial with the transmission axis and having rolling contact with said planetary elements to constrain said elements against the radial forces acting thereon;
- (c) each said spindle having first, second and third planet gears mounted on the spindle and axially spaced therealong;
- (d) a first toothed wheel co-axial with the transmission axis, said toothed wheel being annular and disposed about said planetary elements with said annular toothed wheel having internal gear teeth meshing with the first planet gear on each said spindle;
- (e) at least one input gear meshing with said annular first toothed wheel, said input gear having its axis disposed parallel to the transmission axis;
- (f) a second toothed wheel co-axial with the transmission axis and having gear teeth meshing with the second planet gear on each said spindle;
- (g) a third toothed wheel co-axial with the transmission axis and meshing with the third planet gear on each said spindle to provide an output for the transmission, said second toothed wheel providing the entire reaction force on each planetary element to the output torque of said third toothed wheel;
- and
- (h) the three planet gears of each planetary element are so spaced apart axially along their spindle that the net turning moment exerted by the input, output and reaction forces tending to tilt each planetary element out of its radial plane including the transmission axis is substantially zero.
6 more elements
A transmission comprising:
- (a) a set of free-floating planetary elements spaced circumferentially about the transmission axis and each having a spindle disposed parallel to said axis;
- (b) a plurality of axially-spaced rings co-axial with the transmission axis and having rolling contact with said planetary elements to constrain said elements against the radial forces acting thereon;
- (c) each said spindle having first, second and third planet gears mounted on the spindle and axially spaced therealong;
- (d) input gear means disposed in meshing engagement with the first planet gear on each planetary element spindle to provide input torque to the transmission;
- (e) a first output gear co-axial with the transmission axis and disposed in meshing engagement with the second planet gear on each planetary element spindle;
- (f) a second output gear co-axial with the first output gear and disposed in meshing engagement with the third planet gear such that each output gear provides the entire reaction force on said planetary elements to the output torque transmitted by the other output gear;
- and
- (g) the three planet gears of each planetary element are so spaced axially along their spindle that the centers of their gear teeth meshing with said input gear means and said first and second output gears, respectively, lie substantially on a straight line.
5 more elements
Dependencies are inferred from the claim text.