Valve plate and axial piston hydraulic pump motor including the same
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorsTakeshi Ohno, Makoto Azuma
Life of this patent
Estimating the term…
Abstract
A valve plate is used in a swash plate type motor including a motor shaft and a cylinder block in a motor housing and includes: a sliding supporting surface contacting a rear end surface of the cylinder block to support the cylinder block; a supporting surface that is a surface corresponding to and opposite to the sliding supporting surface; a central through hole through which the motor shaft penetrates; and a plurality of ports and formed around the central through hole as inlets and outlets of operating oil so as to penetrate the valve plate, and a cooling concave portion into which the operating oil flows is formed in a region except for the ports and on the supporting surface.
Claims4
A valve plate used in an axial piston hydraulic pump including a rotating shaft and a rotary cylinder block in a housing, the valve plate comprising:
- a sliding supporting surface configured to contact a rear end surface of the cylinder block to support the cylinder block;
- a back surface corresponding to and opposite to the sliding supporting surface;
- a central hole through which the rotating shaft penetrates;
- a plurality of ports formed around the central hole as inlets and outlets for operating oil so as to penetrate the valve plate;
- a cooling concave portion formed on the back surface;
- a first groove through which the operating oil flows, the first groove being configured to communicate with the cooling concave portion and at least one of either:
- (i) the central hole located on an inner side of the valve plate, or (ii) an inner space of the housing formed on the back surface and located on an outer side of the valve plate;
- and
- a second groove formed on the back surface through which the operating oil flows, the second groove being configured to communicate with the cooling concave portion and an operation oil suction port that is one of the plurality of ports.
A valve plate used in an axial piston hydraulic motor including a rotating shaft and a rotary cylinder block in a housing, the valve plate comprising:
- a sliding supporting surface configured to contact a rear end surface of the cylinder block to support the cylinder block;
- a back surface corresponding to and opposite to the sliding supporting surface;
- a central hole through which the rotating shaft penetrates;
- a plurality of ports formed around the central hole as inlets and outlets for operating oil so as to penetrate the valve plate;
- a cooling concave portion formed on the back surface;
- a first groove through which the operating oil flows, the first groove being configured to communicate with the cooling concave portion and at least one of either:
- (i) the central hole located on an inner side of the valve plate, or (ii) an inner space of the housing formed on the back surface and located on an outer side of the valve plate;
- and
- an operating oil supply passage formed on the back surface through which the operating oil flows, the operating oil supply passage being configured to communicate with the cooling concave portion and an operating oil discharge port that is one of the plurality of ports.
Dependencies are inferred from the claim text.