Pump for metering a liquid additive for a selective catalytic reduction device
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United States of America Patent
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Dec 5, 2017
Grant Date -
Jun 2, 2016
app pub date -
Apr 7, 2014
filing date -
Apr 26, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A device providing a dosed supply of a liquid includes: a pump configured to deliver the liquid and having a pump housing with an inlet and an outlet; an eccentric on the pump housing; and a deformable diaphragm between the pump housing and the eccentric, the deformable diaphragm and the pump housing delimiting a delivery path from the inlet to the outlet and forming a seal of the delivery path. The seal is displaceable along the delivery path, by a movement of the eccentric, in a delivery direction from the inlet to the outlet to deliver the liquid. The pump is configured such that within the pump a friction torque that must be overcome for the eccentric to move is greater than a maximum pressure torque that can be generated by pressurized liquid in the delivery path, so as to prevent movement of the eccentric counter to the delivery direction.
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