Rotary positive-displacement pump
AssigneeRobert Bosch GmbH
InventorsErnst Linder, Helmut Rembold, Walter Teegen, Achill Kessler, Roland Ehmann
Life of this patent
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Abstract
A rotary positive-displacement pump in which the vane or vanes separating the chambers are locked in the inner dead center point after a certain outlet pressure has been attained, in order to shut off the pump. A corresponding locking apparatus has a detent which assures that each vane is locked in a form-locking manner in the position which shuts off the pumping action. Preferably, the locking apparatus has an overstroke step by means of which it is assured that each vane is constantly held at an increased distance from its sliding surface so that friction and impact noises are positively avoided.
Claims12
A rotary postive-displacement pump of the type generating a vacuum comprising, in combination, a housing having a bore and including an inlet side and an outlet side, a rotatable piston eccentrically disposed within said housing bore for rolling engagement therewith, at least one vane in said housing for separating said inlet side from said outlet side and means responsive to supply pressure for locking said vane in a position which shuts off the pumping action of said pump, said locking means including a detent for locking said vane in said position for shutting off the pumping action.
Dependencies are inferred from the claim text.