Patent ID: 9618107
Date: 2017-04-11
CPC Classifications: F04B,F16H

Claim:
1. A pump unit comprising: a drive having a drive motor; a toothed gearing, wherein the toothed gearing has a toothed wheel comprising teeth and a rotational axis; a pump cam and a pump positive-displacement body, wherein each tooth comprises: wherein the toothed wheel having the first and second sections of the teeth rotationally drives the pump cam to move the pump positive-displacement body, the first section of each tooth being separated from the first section of the adjoining teeth by slits, wherein the teeth of the first section are configured as resilient tongues, each of the teeth of the first section being independently movable radially inward with respect to the rotational axis, wherein the first section is movable in a radial direction, the first section extending in an axial direction from the second section, the slits extending parallel to the axial direction, the first section extending in the radial direction beyond an outer circumference of the second section; and wherein the respective teeth are configured such that that the first section of each tooth radially protrudes relative to the adjacent second section of the tooth, the first section having a first section tip diameter, the second section having a second section tip diameter, wherein the second section tip diameter is less than the first section tip diameter.