Operating speed change-over device

Details Operating speed change-over device Operating speed change-over device

1991-02-26

1992-02-04

Look, Edward K.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

91506, F16D 3102, F01B 300

Patent

active

050850520

ABSTRACT:
An operating speed change-over device is equipped with an automatic speed change-over valve which opens and closes a pilot fluid line that connects a pilot port of a capacity change-over valve of a capacity-variable hydraulic motor to a pilot pump. The automatic speed change-over valve has one pilot port that is connected to a pressurized fluid feed line leading to the hydraulic motor and has another pilot port connected to the return fluid line of the hydraulic motor. The automatic speed change-over valve is changed over by an effective differential pressure between the two fluid lines.

REFERENCES:
patent: 3418941 (1968-12-01), Mowbray
patent: 4116002 (1978-09-01), Knapp et al.
patent: 4212164 (1980-07-01), Young
patent: 4341133 (1982-07-01), Sakamoto
patent: 4480438 (1984-11-01), Breeden
patent: 4528813 (1985-07-01), Izumi et al.
patent: 4559778 (1985-12-01), Krusche
patent: 4802336 (1989-02-01), Mayr et al.
patent: 4845950 (1989-07-01), Metzner
patent: 4951462 (1990-08-01), Graf

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