Motors: expansible chamber type – Plural relatively movable or rigidly interconnected working... – With means to control the working fluid to one working...
Patent
1984-05-29
1985-08-20
Maslousky, Paul E.
Motors: expansible chamber type
Plural relatively movable or rigidly interconnected working...
With means to control the working fluid to one working...
91529, 91531, F15B 1116, F15B 1306
Patent
active
045356815
ABSTRACT:
A hydraulic vehicular transmission has a plurality of drive speed establishing devices (e.g. clutches) to be actuated for selecting a drive speed, and a pair of similar drive direction establishing devices to be actuated for selecting a drive direction. The drive establishing devices are all actuated and deactuated hydraulically by respective solenoid operated control valves via respective pilot operated valves. Since the solenoid valves are susceptible to malfunctioning, as in the event of trouble in the associated electrical circuitry, emergency control valves are interposed respectively between the solenoid valves and the pilot operated valves. Each emergency control valve is to be hand operated in the event of the malfunctioning of the associated solenoid valve for actuating or deactuating the associated speed or direction establishing device via the associated pilot operated valve. Additional features are incorporated for the greater utility of the transmission control system.
REFERENCES:
patent: 2984985 (1961-05-01), MacMillin
patent: 3631762 (1972-01-01), Fuzzell
patent: 3817153 (1974-06-01), Zunzer
patent: 4395927 (1983-08-01), Muller et al.
patent: 4420994 (1983-12-01), Muller et al.
Kuse Takashi
Nakamura Masaru
Kabushiki Kaisha Komatsu Seisakusho
Maslousky Paul E.
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