Pump unit

Details Pump unit Pump unit

2006-04-18

2006-04-18

Lazo, Thomas E. (Department: 3745)

Power plants

Pressure fluid source and motor

Having distinct cooling or lubricating structure

C060S484000, C060S486000

Reexamination Certificate

active

07028472

ABSTRACT:
The present invention provides a pump unit including at least one hydraulic pump with inlet and outlet ports, a pump case for accommodating the hydraulic pump having an opening through which the hydraulic pump is insertable, and a lid, called a center section, closing the pump case. The center section forms a pair of inlet/outlet passages communicating an end with the inlet and outlet ports of the hydraulic pump and an end opening through a pump case abutting surface of the center section, and a first charging passage by which hydraulic fluid is fed through the pump case abutting surface of the center section. At least one of the pump case and the center section communicates the first charging passage with the pair of inlet/outlet passages via a first hydraulic fluid feeding valve preventing the reverse flow into said first charging passage.

REFERENCES:
patent: 4920733 (1990-05-01), Berrios
patent: 4934252 (1990-06-01), Giere
patent: 4955249 (1990-09-01), Wetor
patent: 5069037 (1991-12-01), Sakigawa et al.
patent: 5094077 (1992-03-01), Okada
patent: 5622051 (1997-04-01), Iida et al.
patent: 5957229 (1999-09-01), Ishii
patent: 6122996 (2000-09-01), Hauser et al.

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