Hydraulic circuit of construction machinery

Details Hydraulic circuit of construction machinery Hydraulic circuit of construction machinery

2006-07-18

2006-07-18

Lopez, F. Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

Reexamination Certificate

active

07076947

ABSTRACT:
To keep one of three hydraulic pumps unaffected by variations in torque of the remaining hydraulic pumps when the three hydraulic pumps are used, displacements of the first and second hydraulic pumps are controlled based on their own delivery pressures P1, P2and a pressure P3′ obtained by reducing through a reducing valve14a delivery pressure P3from the third hydraulic pump, while a displacement of the third hydraulic pump3is controlled only by its own delivery pressure P3. The pressure oil delivered from the third hydraulic pump3, therefore, remains unaffected by variations in delivery flow rates from the first and second hydraulic pumps1,2, in other words, by variations in their torque consumptions, so that the third hydraulic pump is assured to provide a stable flow rate.

REFERENCES:
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patent: 4904161 (1990-02-01), Kamide et al.
patent: 5245828 (1993-09-01), Nakamura
patent: 5974796 (1999-11-01), Ishikawa et al.
patent: 6276133 (2001-08-01), Yoshida et al.
patent: 57-18061 (1982-01-01), None
patent: 59-085046 (1984-05-01), None
patent: 59-181283 (1984-12-01), None
patent: 05-248414 (1993-09-01), None

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