Hydraulic circuit system for hydraulic working machine

Details Hydraulic circuit system for hydraulic working machine Hydraulic circuit system for hydraulic working machine

1997-12-09

1999-11-02

Lopez, F. Daniel

Power plants

Pressure fluid source and motor

Unsafeness, unreadiness or disarray prevent manual change or...

60445, 60452, F16D 3102

Patent

active

059747960

ABSTRACT:
A regulator (20) comprises a servo piston 21 and a tilting control valve (22) which is made up of a spool (22a), a spring (22b), a control piston (22d) and a first pressure bearing chamber (22e). With these components, the regulator (20) controls a pump tilting such that a pump delivery rate is reduced as delivery pump pressure rises. The tilting control valve (22) also includes a second pressure bearing chamber (22f). When a gate-lock lever (31) is operated to switch over a lock valve (30), a flow control valve (6) is disabled from operating not to move even if a control lever (11a) is erroneously touched, and the machine is surely kept from coming into operation. At the same time, pilot primary pressure from a pilot pump (3) is introduced to the second pressure bearing chamber (22f) of the tilting control valve (22), causing the pump tilting to reduce down to a minimum tilting (q.sub.min). In the inoperative condition where the operator has no intention of carrying out work, it is thus possible to minimize the tilting of the hydraulic pump and reduce an energy loss.

REFERENCES:
patent: 2455837 (1948-12-01), Waldie
patent: 3971216 (1976-07-01), Miller
patent: 4730543 (1988-03-01), Holmes
patent: 4838755 (1989-06-01), Johnson et al.

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