Control valve for prime mover speed control in hydraulic systems

Details Control valve for prime mover speed control in hydraulic systems Control valve for prime mover speed control in hydraulic systems

1996-03-20

1997-09-09

Michalsky, Gerald A.

Power plants

Pressure fluid source and motor

Methods of operation

60431, 60434, 137596, 13762568, F15B 1304

Patent

active

056644175

ABSTRACT:
A control valve (10) is provided for mobile or stationary hydraulic equipment for automatically increasing or decreasing speed of a prime mover in response to operation of a hand lever to extend a hydraulic cylinder. A prime mover speed control valve (42) is integrated with a spool (12) in a single housing (10) for the purpose of simultaneously controlling the supply of fluid to a hydraulic cylinder (16) and to a cylinder (61) controlling prime mover speed. When the spool (12) is in the "CYLINDER EXTEND" or "NEUTRAL" position for the implement cylinder, a hydraulic control signal is provided from port (55) to the prime mover control cylinder (61) to signal increased prime mover speed and increased output from a hydraulic pump (17). When the spool (12) is in the "CYLINDER RETRACT" position for the implement cylinder (16), the spool (12) blocks the signal from port (55) while allowing fluid to drain from the implement cylinder (16) to a reservoir (29).

REFERENCES:
patent: 3685540 (1972-08-01), Wilke
patent: 4693272 (1987-09-01), Wilke
patent: 4862691 (1989-09-01), Peschel
patent: 5000001 (1991-03-01), Christensen et al.
patent: 5138837 (1992-08-01), Obertrifter
patent: 5146747 (1992-09-01), Sugiyama et al.
patent: 5415199 (1995-05-01), Claudinon et al.

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