Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1990-03-07
1991-04-09
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
475299, 475142, 475146, F16H 5710
Patent
active
050061003
ABSTRACT:
A particularly compact planetary gear mechanism includes an axially shiftable ring gear to provide either a direct drive mode or a speed reduction ratio mode between an input sun gear thereof and an output planet carrier thereof. In a first embodiment, the ring gear is urged in a first direction by a compressible spring apparatus to a conjoint coupled relationship with the sun gear for direct drive. In a less frequently used mode the ring gear is urged by a hydraulically actuated annular piston closely encircling it into a fixed relationship with a stationary coupling in opposition to the compressible spring apparatus. A second embodiment has no spring apparatus so that the annular piston is hydraulically biased in either axial direction for positively shifting the ring gear. A speed reduction ratio of about 3 or 4:1 is obtained in the secondary mode so that when the planetary gear mechanism is used in a vehicle a relatively low ground speed is maintainable which is especially useful for specialized attachments such as a snow blower, broom or the like. With this construction the sun gear transmits only a relatively small proportion of the total torque during the normal direct drive mode so that an economical construction is possible.
REFERENCES:
patent: 2331684 (1943-10-01), Henningsen
patent: 4821591 (1989-04-01), Adler
patent: 4920828 (1990-05-01), Kameda et al.
Blake William W.
Brandt Christopher D.
Kettler David C.
Windish Willis E.
Caterpillar Inc.
Lanchantin, Jr. Charles E.
Wright Dirk
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