Oil pump
AssigneeJidosha Kiki Co., Ltd.
InventorsHideo Konishi, Toyoji Takebuchi
Life of this patent
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Abstract
An oil pump includes pump constituent elements, a pump body, and a driving shaft. The pump constituent elements define a pump chamber between a rotor and a cam ring that houses the rotor. The pump body is constituted by a front body and a rear body. The front body defines a housing space for housing the pump constituent elements. The driving shaft extends through and is axially supported by the front body to rotatably drive the rotor. An annular space is formed around the driving shaft in the front body, between a bearing for rotatably driving the driving shaft of the front body, and the pump chamber of the pump constituent elements. A flow control valve is placed in the annular space to return part of a pump discharge fluid from the pump chamber to a pump suction side.
Claims14
An oil pump comprising:
- pump constituent elements constituted by a rotor, a cam ring for housing said rotor to define a pump chamber together with said rotor, and a pressure plate disposed at least on one side of said rotor and said cam ring;
- a pump body constituted by a front body, which defines a housing space for housing said pump constituent elements, and a rear body;
- and
- a driving shaft extending through and axially supported by said front body to rotatably drive said rotor, wherein
- an annular space is formed around said driving shaft in said front body on a front side of said housing space, and
- a flow control valve is placed in said annular space to return part of a pump discharge fluid from said pump chamber to a pump suction side.
An oil pump comprising;
- pump constituent elements for defining a pump chamber between a rotor and a cam ring that houses said rotor;
- a pump body comprising a front and rear body, said pump body for causing a pressure plate and said rear body to oppose each other on two sides of said pump constituent elements, wherein the pump body defines a housing space for housing said pump constituent elements;
- and
- a flow control valve for returning part of a discharge fluid discharged from a discharges side of said pump chamber to a suction side as an excessive fluid,
- wherein suction openings for guiding a suction fluid from a tank to a suction side of said pump chamber are formed in an end face of said rear body,
- an excessive fluid introducing opening for returning the excessive fluid to the suction side of said pump chamber is formed in an end face of said pressure plate;
- a driving shaft extending through and axially supported by said front body to rotatably drive said rotor;
- wherein an annular spaces is formed around said driving shaft in said front body on a front side of said housing space,
- wherein said flow control valve is placed in said annular space to return part of pump discharge fluid from said pump chamber to said pump suction side.
An oil pump comprising:
- pump constituent elements for defining a pump chamber between a rotor and a cam ring that houses said rotor;
- a pump body for defining a housing space that houses said pump constituent elements, wherein said pump body defines a front body,
- a discharge pressure chamber formed in said pump body to guide a discharge fluid discharges from said pump chamber so as to discharge the discharge fluid from a discharge port through a discharge path;
- a flow control valve connected to part of said discharge path to return part of the discharge fluid to an excessive fluid return path when a flow rate of the discharge fluid is not less than a redetermined valve;
- a suction path for guiding a suction fluid from a suction port formed in said pump body to a suction side of said pump chamber;
- a pressure plate stacked, on one side of said rotor and said cam ring, on a discharge pressure chamber;
- a rear body arranged on the other side of said rotor and said cam ring to be integral with or separate from said pump body, said rear body being formed with a suction opening for guiding the suction fluid into said pump clamber,
- wherein said pressure plate is formed with a groove to serve as a return path for guiding an excessive fluid, returned to the suction side through said flow control valve, to the suction side of said pump chamber,
- said groove has an excessive fluid introducing opening formed at a position opposing said suction opening of said rear body;
- a driving shaft extending through and axially supported by the front body to rotatably drive said rotor
- an annular spaces is formed around said driving shaft in said front body on a front side of said housing space, and
- wherein the flow control valve is placed in said annular space to return part of pump discharge fluid from said pump chamber to a pump suction side.
Dependencies are inferred from the claim text.