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▼
What is claimed is: 1. A pump unit including first and second hydraulic pumps and disposed away from first and second hydraulic motors with which the first and second hydraulic pumps are fluidly connected, comprising: a housing enclosing the first and second hydraulic pumps and formed with an openi
What is claimed is: 1. A pump unit including first and second hydraulic pumps and disposed away from first and second hydraulic motors with which the first and second hydraulic pumps are fluidly connected, comprising: a housing enclosing the first and second hydraulic pumps and formed with an opening that has a size allowing the first and second hydraulic pumps to pass therethrough, and a center section detachably connected to the pump case so as to close the opening, wherein the center section includes a first end surface which connects to the housing and with which the first and second hydraulic pumps are brought into contact in a rotatable manner, a second end surface facing in a direction opposite to the first end surface, first to fourth side surfaces extending between corresponding side edges of the first and second end surfaces, the first and second side surfaces facing in an opposite direction from each other, and the third and fourth side surfaces facing in an opposite direction from each other, the center section is provided with a first pair of inlet/outlet passages that have first ends fluidly connected with the first hydraulic pump and second ends opened to the outside of the center section to form a pair of first connection ports connectable to the first hydraulic motor, and a second pair of inlet/outlet passages that have first ends fluidly connected with the second hydraulic pump and second ends opened to the outside of the center section to form a pair of second connection ports connectable to the second hydraulic motors, and the pair of first connection ports are opened at the first side surface of the center section, and the pair of second connection ports are opened at the second side surface of the center section. 2. A pump unit according to claim 1, further comprising a bypass valve for selectively communicating or shutting off between the first pair of inlet/outlet passages and between the second pair of inlet/outlet passages, wherein the bypass valve is disposed at one of the third and fourth side surfaces of the center section. 3. A pump unit including first and second hydraulic pumps and disposed away from first and second hydraulic motors with which the first and second hydraulic pumps are fluidly connected, comprising: a housing enclosing the first and second hydraulic pumps and formed with an opening that has a size allowing the first and second hydraulic pumps to pass therethrough, and a center section detachably connected to the pump case so as to close the opening, wherein the center section includes a first end surface which connects to the housing and with which the first and second hydraulic pumps are brought into contact in a rotatable manner, a second end surface facing in a direction opposite to the first end surface, first to fourth side surfaces extending between corresponding side edges of the first and second end surfaces, the first and second side surfaces facing in an opposite direction from each other, and the third and fourth side surfaces facing in an opposite direction from each other, the center section is provided with a first pair of inlet/outlet passages that have first ends fluidly connected with the first hydraulic pump and second ends opened to the outside of the center section to form a pair of first connection ports connectable to the first hydraulic motor, a second pair of inlet/outlet passages that have first ends fluidly connected with the second hydraulic pump and second ends opened to the outside of the center section to form a pair of second connection ports connectable to the second hydraulic motors, a first pair of check valves for allowing hydraulic fluid to flow from a hydraulic source to the first pair of inlet/outlet passages while preventing the reverse flow, and a second pair of check valves for allowing hydraulic fluid to flow from the hydraulic source to the second pair of inlet/outlet passages while preventing the reverse flow, all of the pair of first connection ports and the pair of second connection ports are opened at one of the first and second side surfaces of the center section, and the pair of first check valves are disposed at one of the third and fourth side surfaces of the center section, and the pair of second check valves are disposed at the other of the third and fourth side surfaces of the center section. 4. A pump unit including first and second hydraulic pumps and disposed away from first and second hydraulic motors with which the first and second hydraulic pumps are fluidly connected, comprising: a housing enclosing the first and second hydraulic pumps and formed with an opening that has a size allowing the first and second hydraulic pumps to pass therethrough, and a center section detachably connected to the pump case so as to close the opening, wherein the center section includes a first end surface which connects to the housing and with which the first and second hydraulic pumps are brought into contact in a rotatable manner, a second end surface facing in a direction opposite to the first end surface, first to fourth side surfaces extending between corresponding side edges of the first and second end surfaces, the first and second side surfaces facing in an opposite direction from each other, and the third and fourth side surfaces facing in an opposite direction from each other, the center section is provided with a first pair of inlet/outlet passages that have first ends fluidly connected with the first hydraulic pump and second ends opened to the outside of the center section to form a pair of first connection ports connectable to the first hydraulic motor, a second pair of inlet/outlet passages that have first ends fluidly connected with the second hydraulic pump and second ends opened to the outside of the center section to form a pair of second connection ports connectable to the second hydraulic motors, a first pair of check valves for allowing hydraulic fluid to flow from a hydraulic source to the first pair of inlet/outlet passages while preventing the reverse flow, and a second pair of check valves for allowing hydraulic fluid to flow from the hydraulic source to the second pair of inlet/outlet passages while preventing the reverse flow, the center section is formed with four holes into which the first and second pair of check valves are respectively inserted, two of the four holes being opened at the third side surfaces of the center section, and the other two of the four holes being opened at the fourth side surfaces of the center section, and the first and second pair of connection ports are opened at the side surfaces of the center section other than the third and fourth side surfaces.
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