Hydraulic drive circuit for load-handling machines

Details Hydraulic drive circuit for load-handling machines Hydraulic drive circuit for load-handling machines

1980-04-01

1982-03-02

Michalsky, Gerald A.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

91451, 13759612, F15B 1302

Patent

active

043174663

ABSTRACT:
A hydraulic drive circuit for a load-handling machine such as hydraulic crawler crane, shovel or the like in which the maximum output pressure of the circuit is determined by a main relief valve provided on the delivery side of a hydraulic pump. The drive circuit is capable of producing a surge of power or output by automatically increasing the relief pressure of the main relief valve above a rated pressure of the circuit for a short time period of about a few seconds, when required for extracting an implanted pile, for pulling a bucket which is caught on a large stone, or for getting a machine out of a muddy spot. At the end of the predetermined time period, the circuit pressure is automatically returned to the level of the rated pressure. The surge output is from 130% to 150% of the rated output but allows use of hydraulic components or an engine of a capacity designed for the rated output without troubles or engine stops.

REFERENCES:
patent: 3416561 (1968-12-01), Kokaly
German Publication "Olhydraulik und Pneumatik", 1967, vol. 11, No. 2, p. 61, portion relating to FIG. 11.

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