Hydraulic oil filtration apparatus

Details Hydraulic oil filtration apparatus Hydraulic oil filtration apparatus

2005-08-23

2005-08-23

Prince, Fred G. (Department: 1724)

Liquid purification or separation

Structural installation

Closed circulating system

C210S258000, C210S335000, C210S416500

Reexamination Certificate

active

06932902

ABSTRACT:
A hydraulic oil filtration apparatus40comprises an actuation control valve V, a pump-pressure oil passage41, a connection oil passage43, a tank oil passage51, a return filter60, a drain oil passage53, a drain filter70and an aspirator structure90. The actuation control valve V controls to charge and discharge a hydraulic actuator A such as a boom cylinder22and travel motors with hydraulic oil from a hydraulic pump P, which is connected through the pump-pressure oil passage41to the actuation control valve V The hydraulic actuator A is connected with the actuation control valve V by the connection oil passage43, and the actuation control valve V is connected to a tank T by the tank oil passage51, in which the return filter60is provided. The part of the tank oil passage51downstream with respect to the return filter60is connected to the hydraulic pump P by the drain oil passage53, in which the drain filter70is provided. The aspirator structure90is positioned at the junction between the tank oil passage51and the drain oil passage53, so that leakage oil in the drain oil passage53is drawn by the flow of the discharged oil through the tank oil passage51and led to the drain filter70.

REFERENCES:
patent: 3262564 (1966-07-01), Silverwater et al.
patent: 3335863 (1967-08-01), Silverwater
patent: 4850498 (1989-07-01), Taylor
patent: 6063269 (2000-05-01), Miller et al.

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