Patent ID: 8231359

Claim:
A pump unit, comprising: a main pump ( 4 ), wherein the main pump has an inlet line ( 17 ); and a charge pump ( 5 ), wherein the charge pump has an outlet line ( 35 ), wherein the charge pump ( 5 ) is located in a recess ( 24 ) in a housing part, wherein a pump capacity of said charge pump is adjustable via an adjusting means, wherein to adjust the pump capacity of the charge pump ( 5 ), an adjusting means of the charge pump ( 5 ) is acted upon by an adjusting force which is dependent on the inlet pressure of the main pump ( 4 ); a pressure chamber ( 27 ) formed between the housing part and the adjusting means, wherein the outlet line ( 35 ) of the charge pump is not directly connected to the pressure chamber ( 27 ), and wherein the inlet line ( 17 ) of the main pump is connected to the pressure chamber ( 27 ) via an adjustment pressure channel ( 26 ).