초록 ▼

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 secti

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.

대표청구항 ▼

1. A pump unit comprising:at least one hydraulic pump with inlet and outlet ports formed therein; a pump case for accommodating said at least one hydraulic pump, said pump case having an opening through which said at least one hydraulic pump is insertable; a center section connected to said pump cas

1. A pump unit comprising:at least one hydraulic pump with inlet and outlet ports formed therein; a pump case for accommodating said at least one hydraulic pump, said pump case having an opening through which said at least one hydraulic pump is insertable; a center section connected to said pump case in such a manner as to close said opening of the pump case; said center section forming a pair of inlet/outlet passages having first ends respectively communicating with said inlet and outlet ports of said at least one hydraulic pump and second ends opening to the outside of the center section through a pump case abutting surface of the center section, and a first charging passage having a first end through which working hydraulic fluid is fed into the center section and a second end opening to the outside of the center section through said pump case abutting surface of the center section; at least one of said pump case and said center section forming a communication passage for communication between said second ends of the pair of inlet/outlet passages and said second end of the first charging passage; a first hydraulic fluid feeding valve for allowing hydraulic fluid to flow from said first charging passage to said pair of inlet/outlet passages while preventing the reverse flow; and said first hydraulic fluid feeding valve being installable through one of said pump case abutting surface of the center section and a center section abutting surface of the pump case.