Rotary swash plate hydraulic pump
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorsShinji Nishida, Isamu Yoshimura, Satoru Takao
Life of this patent
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Abstract
This rotary swash plate hydraulic pump includes: a casing; a cylinder block including a cylinder bore and disposed in the casing so as to prevent relative rotation of the cylinder block; a piston that is inserted into the cylinder bore; a rotary swash plate that is housed in the casing so as to be rotatable about an axis and reciprocates the piston; and a variable capacity mechanism that changes an effective stroke length of the piston. The variable capacity mechanism includes a spool that changes the effective stroke length of the piston by adjusting opening and closing of the cylinder bore that corresponds to the spool. The cylinder block includes a spool hole into which the spool is inserted.
Claims9
A rotary swash plate hydraulic pump comprising:
- a casing;
- a cylinder block including a cylinder bore and disposed in the casing so as to prevent relative rotation of the cylinder block;
- a piston that is inserted into the cylinder bore;
- a rotary swash plate that is housed in the casing so as to be rotatable about an axis and reciprocates the piston;
- and
- a variable capacity mechanism that changes an effective stroke length of the piston, wherein:
- the variable capacity mechanism includes a spool that changes the effective stroke length of the piston by adjusting opening and closing of the cylinder bore that corresponds to the spool;
- and
- the cylinder block includes a spool hole into which the spool is inserted.
A rotary swash plate hydraulic pump comprising:
- a casing;
- a cylinder block including a cylinder bore and disposed in the casing so as to prevent relative rotation of the cylinder block;
- a piston that is inserted into the cylinder bore;
- a rotary swash plate that is housed in the casing so as to be rotatable about an axis and reciprocates the piston;
- a variable capacity mechanism that changes an effective stroke length of the piston;
- an inlet check valve that allows a flow of a working fluid in one direction to the cylinder bore and blocks an opposite flow of the working fluid;
- and
- a discharge check valve that allows a flow of the working fluid in one direction discharged from the cylinder bore and blocks an opposite flow of the working fluid, wherein:
- the piston is inserted into an end of the cylinder bore that is located on one side in an axial direction;
- the cylinder bore is connected to an inlet passage on the other side in the axial direction;
- the inlet check valve is inserted into a portion of the cylinder bore that is located on the other side in the axial direction;
- and
- the discharge check valve is positioned radially outward of the inlet check valve as viewed in the axial direction.
Dependencies are inferred from the claim text.