Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid control of friction planetary gearing
Patent
1989-08-04
1991-06-18
Herrmann, Allan D.
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid control of friction planetary gearing
91405, 91409, 74200, F16H 1536, F15B 1522
Patent
active
050246356
ABSTRACT:
A hydraulic ram unit for a transmission of the toroidal-race, rolling-traction type. The ram is connected to the rollers of the transmission so that the position of the ram within its stroke is related to the angular setting of the rollers and so to the transmitted ratio. The ram pistons move within cylinders the inlet and outlet ports of which are located in the cylinder end walls, with the outlet ports axially protruding of the inlet ports. If a piston overshoots its normal stroke it tends first to restrict flow through the outlet port and then to contact and obstruct it, so creating firstly hydraulic and then contact forces to resist further overshoot, without substantially restricting the inlet port. Novel construction for the ram itself, and for the ram cylinders and casing are also described.
REFERENCES:
patent: 3034482 (1962-05-01), Rader
patent: 3093118 (1963-06-01), Brown
patent: 3322039 (1967-05-01), Madland
patent: 3442178 (1961-05-01), Daniels
patent: 3695378 (1972-10-01), Garrison et al.
patent: 3802319 (1974-04-01), Bridwell et al.
patent: 3898915 (1975-08-01), Neuman
patent: 4297918 (1981-11-01), Perry
patent: 4662248 (1987-05-01), Greenwood
patent: 4700611 (1987-10-01), Kaneko
Herrmann Allan D.
Ta Khoi Q.
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