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US 5,490,770 AGranted
Vane pump having vane pressurizing grooves
AssigneeAisin Seiki Kabushiki Kaisha
InventorNaoki Oogushi
Life of this patent
Estimating the term…
Abstract
When one chamber of vane pump is located at an end of a discharge process and is compressed at maximum, pressure in the chamber is higher than the discharge pressure of the pump. Vanes are supported in slits of a rotor. A passage connecting the one chamber and inner sides of the vanes in the slits supplies pressure to push the vanes onto an inner surface of a cam-ring of the pump.
Claims15
A vane pump comprising:
- a housing having a suction port and a discharge port;
- a cam-ring rotatably disposed in the housing;
- a rotor having slits and rotatably disposed in the housing and forming a ring-shaped space in cooperation with the cam-ring;
- vanes radially supported in the slits of the rotor and defining separate chambers in the ring-shaped space, said chambers each successively communicating with said suction port and said discharge port during rotation of said rotor to pump a fluid in said chambers from said suction port to said discharge port;
- a suction side pressurizing groove and a discharge side pressurizing groove formed in the housing and communicating with inner sides of the vanes in the slits for applying oil pressure thereto, said discharge side pressurizing groove having a length greater than that of said suction side pressurizing groove;
- and
- a passage connecting one of the chambers which is compressed at maximum with said discharge side pressurizing groove for supplying oil pressure from said one of the chambers to said discharge side pressurizing groove, so that a high oil pressure in said one of the chambers is applied to said discharge side pressurizing groove,
- wherein said suction side pressurizing groove is positioned such that the inner sides of the vanes defining said one of the chambers do not communicate with said suction side pressurizing groove until said rotor has at least reached a rotational position wherein said one of the chambers communicates with said suction port.
5 more elements
A vane pump comprising:
- a housing having a suction port and a discharge port;
- a cam-ring rotatably disposed in the housing;
- a rotor having slits and rotatably disposed in the housing and forming a ring-shaped space in cooperation with the cam-ring;
- vanes radially supported in the slits of the rotor and defining separate chambers in the ring-shaped space, said chambers each successively communicating with said suction port and said discharge port during rotation of said rotor to pump a fluid in said chambers from said suction port to said discharge port;
- a suction said pressurizing groove and a discharge side pressurizing groove formed in the housing and communicating with inner sides of the vanes in the slits for applying oil pressure thereto, said discharge side pressurizing grove having a length greater than that of said suction side pressurizing groove;
- and
- a passage connecting one of the chambers which is immediately downstream of said discharge port in the direction of rotation of said rotor with said discharge side pressurizing groove for supplying oil pressure from said one of the chambers to said at least one discharge side pressurizing groove, so that a high oil pressure in said one of the grooves is applied to said discharge side pressurizing groove,
- wherein said suction side pressurizing groove is positioned such that the inner sides of the vanes defining said one of the chambers do not communicate with said suction side pressurizing groove until said rotor has at least reached a rotational position wherein said one of the chambers communicates with said suction port.
5 more elements
A hydraulic system, comprising:
- a vane pump which has a variable volume discharge;
- an apparatus using oil pressure discharge from the vane pump;
- and
- means for controlling the volume discharged from the vane pump,
- wherein the vane pump comprises:
- a housing having a suction port and a discharge port;
- a cam-ring rotatably disposed in the housing;
- a rotor having slits and rotatably disposed in the housing and forming a ring-shaped space in cooperation with the cam-ring;
- vanes radially supported in the slits of the rotor and defining separate chambers in the ring-shaped space, said chambers each successively communicating with said suction port and said discharge port during rotation of said rotor to pump a fluid in said chambers from said suction port to said discharge port;
- a suction side pressurizing groove and a discharge side pressurizing groove formed in the housing and communicating with inner sides of the vanes in the slits for applying oil pressure thereto, said discharge side pressurizing groove having a length greater than that of said suction side pressurizing groove;
- and
- a passage connecting one of the chambers which is compressed at maximum with said discharge side pressurizing groove for supplying oil pressure from said one of said chambers to said discharge side pressurizing groove, wherein said one of the chambers is immediately downstream of said discharge port, so that a high oil pressure in said one of the chambers is applied to said discharge side pressurizing groove,
- wherein said suction side pressurizing groove is positioned such that the inner sides of the vanes defining said one of the chambers do not communicate with said suction side pressurizing groove until said rotor has at least reached a rotational position wherein said one of the chambers communicates with said suction port.
10 more elements
Dependencies are inferred from the claim text.