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US 2003/0165383 A1Published application
Variable flow water pump
AssigneeTesma International Inc.
InventorDavid Mark Pascoe
Life of this patent
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Abstract
A variable-capacity water pump includes a housing having an impeller mounted on a rotatable shaft. The impeller includes a plurality of vanes pivotally coupled between upper and lower shroud and operatively coupled to a pitch plate. As the pump speed increases in response to increasing engine speed, the pitch plate controls the rotation of the impeller vanes about a fixed rivet from a maximum pitch position, toward a minimum pitch position, thereby lowering pump output according to engine cooling requirements.
Claims10
A variable capacity coolant pump comprising:
- a pump housing for directing the flow of fluid through said pump between an inlet and an outlet;
- a shaft rotatably journaled to said pump housing;
- an impeller coupled to said pump housing for pumping fluid through said pump housing from said inlet to said outlet, said impeller rotatably journaled to said shaft and including a shroud and at least one vane pivotally coupled to said shroud for pivotal movement between a plurality of pitch angles relative to said shaft;
- a pitch plate operatively coupled to said vane for controlling said pitch angle of said vane;
- and
- a spring coupled to said pitch plate for biasing said vane to a maximum pitch angle, wherein said vane varies in said pitch in response to a force of fluid pressure from said inlet and automatically reduces said pitch angle of said vane upon an increase in said fluid pressure from said inlet to reduce the flow of fluid to said outlet.
3 more elements
Dependencies are inferred from the claim text.