Patent ID: 11873812
Assignee: SCHWäBISCHE HüTTENWERKE AUTOMOTIVE GMBH
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 12:
13. A rotary pump having an adjustable delivery volume, the rotary pump comprising:
(a) a pump housing having a low-pressure inlet and a high-pressure outlet for a fluid to be delivered; and
(b) a delivery rotor arranged such that it is rotatable about a rotational axis in the pump housing and comprising multiple delivery means which are distributed over a circumference of the delivery rotor for delivering the fluid from the low-pressure inlet to the high-pressure outlet; and
(c) a setting element which is adapted to be translationally moved back and forth in relation to the pump housing for adjusting the delivery volume of the rotary pump, wherein
(d) an inlet end of the setting element comprises:
(d1) a first circumferential portion which extends circumferentially in a rotational direction of the delivery rotor and an axial width of which is smaller than an axial width of the delivery means and
(d2) a second circumferential portion which adjoins the first circumferential portion in the rotational direction of the delivery rotor and an axial width of which is greater than the axial width of the first circumferential portion, wherein

(e) a transition, in the rotational direction of the delivery rotor, from the first circumferential portion to the second circumferential portion is arranged in the low-pressure inlet in each position of the setting element,, wherein the setting element comprises a first sealing sliding surface, which is in sliding contact with the pump housing and is provided next to the first circumferential portion, and a second sealing sliding surface which is in sliding contact with the pump housing and is provided next to the second circumferential portion, wherein the first sealing sliding surface and the second sealing sliding surface slide along the pump housing when the setting element is translationally adjusted, and, wherein the first sealing sliding surface comprises a first sealing edge at an end facing the second sealing sliding surface, and the second sealing sliding surface comprises a second sealing edge at an end facing the first sealing sliding surface, and each of the first sealing edge and the second sealing edge each seal off the low-pressure inlet at the transition in the sliding contact between the pump housing and the setting element, and wherein the transition exhibits a distance from the first sealing edge as measured in the circumferential direction, in the rotational direction of the delivery rotor, which is greater than or equal to a distance from the second sealing edge as measured in the circumferential direction.