Hydraulic control system

Details Hydraulic control system Hydraulic control system

1995-12-12

1998-11-10

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60422, 60429, F16D 3102

Patent

active

058327290

ABSTRACT:
A fluid power control system for use in a mini-excavator, in which a first control section (S2) includes first and second control valves respectively connectable to first (2) and second (4) implement functions; and in tandem with one another. A first gear pump (P2) supplies the actuator connected principally to the first implement (2), and a second gear pump (P3) supplies working fluid to the interconnection between the first and second control valves. The advantage of this arrangement is that, as the first control valve switches from its neutral position to a position selecting its associated implement (2), progressively more of the fluid passing through the second control valve is supplied by the second pump (P3) until, when the implement (2) to which the first control valve is principally connected is fully selected, the two implements (2, 4) are supplied separately by the respective gear pumps (P2, P3).

REFERENCES:
patent: 3922855 (1975-12-01), Birdwell et al.
patent: 5052179 (1991-10-01), Fujii

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