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The invention proposes a fuel delivery device for a fuel injection device of an internal combustion engine, having a delivery pump (10) and having at least one high-pressure pump (16). By means of the delivery pump (10), fuel from a storage container (12) is delivered to the suction side of the high

The invention proposes a fuel delivery device for a fuel injection device of an internal combustion engine, having a delivery pump (10) and having at least one high-pressure pump (16). By means of the delivery pump (10), fuel from a storage container (12) is delivered to the suction side of the high-pressure pump (16), and fuel is delivered into a high-pressure region (18) by the high-pressure pump (16). The delivery pump (10) has an adjustable displacement volume, which means that a variable quantity of fuel can be conveyed at the same rotational speed.

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1. A fuel delivery device for a fuel injection device of an internal combustion engine, having a supply pump (10) and at least one high-pressure pump (16), wherein the supply pump (10) delivers fuel from a fuel tank (12) to a suction side of the high-pressure pump (16) and the high-pressure pump (16

1. A fuel delivery device for a fuel injection device of an internal combustion engine, having a supply pump (10) and at least one high-pressure pump (16), wherein the supply pump (10) delivers fuel from a fuel tank (12) to a suction side of the high-pressure pump (16) and the high-pressure pump (16) delivers fuel to a high-pressure region (18), characterized in that the supply pump (10) has a variable displacement, wherein the supply pump (10) has a constant speed of rotation such that the supply pump (10) is configured to deliver a variable quantity of fuel at the constant speed of rotation, wherein each of a hydraulic line (26), a suction port (56), and a delivery port (58) are coupled to the supply pump (10), the suction portion (56) configured to move fuel from the fuel tank (12) to the supply pump (10), the delivery port (58) configured to move fuel from the supply pump (10) to the high-pressure pump (16), and the hydraulic line (26) configured to provide a control pressure to the supply pump (10), wherein the hydraulic line (26) is a first hydraulic line, wherein the supply pump (10) is coupled to the high-pressure pump (16) via a second hydraulic line (6), and wherein one end of the first hydraulic line (26) is coupled directly to the second hydraulic line (6). 2. The fuel delivery device as claimed in claim 1, characterized in that the supply pump (10) delivers a variable quantity of fuel, which varies between a zero delivery quantity and a maximum quantity, the maximum quantity being given by a maximum displacement of the supply pump (10). 3. The fuel delivery device as claimed in claim 1, characterized in that the control pressure is a fuel pressure on a delivery side (6) of the supply pump (10). 4. The fuel delivery device as claimed in claim 1, characterized in that the control pressure is a fuel pressure between a fuel filter (38) and the suction side of the high-pressure pump (16). 5. The fuel delivery device as claimed in claim 1, characterized in that the variable displacement is additionally influenced by a regulating pressure. 6. The fuel delivery device as claimed in claim 5, characterized in that the regulating pressure is adjusted by a pressure regulator (15). 7. The fuel delivery device as claimed in claim 5, characterized in that the regulating pressure is adjusted as a function of at least one of an engine operating point and a pressure in the high-pressure region (18). 8. The fuel delivery device as claimed in claim 1, characterized in that the supply pump (10) is a variable vane cell pump, a variable external gear pump, a variable roller cell pump, a variable internal gear pump or a variable pendulum-slider pump. 9. The fuel delivery device as claimed in claim 6, characterized in that the regulating pressure is adjusted as a function of at least one of an engine operating point and a pressure in the high-pressure region (18). 10. The fuel delivery device as claimed in claim 1, wherein the supply pump (10) includes a first control piston (48) and a second control piston (50), and wherein the control pressure impinges upon the first control piston (48) to change the quantity of fuel exiting the supply pump (10) through the delivery port (58). 11. The fuel delivery device as claimed in claim 10, wherein a regulating pressure impinges upon the second control piston (50). 12. The fuel delivery device as claimed in claim 11, wherein the supply pump (10) further includes a spring (52) which also impinges upon the second control piston (50). 13. A fuel delivery device for a fuel injection device of an internal combustion engine, having a supply pump (10) and at least one high-pressure pump (16), wherein the supply pump (10) delivers fuel from a fuel tank (12) to a suction side of the high-pressure pump (16) and the high-pressure pump (16) delivers fuel to a high-pressure region (18), characterized in that the supply pump (10) has a variable displacement, wherein the supply pump (10) has a constant speed of rotation such that the supply pump (10) is configured to deliver a variable quantity of fuel at the constant speed of rotation, wherein each of a hydraulic line (26), a suction port (56), and a delivery port (58) are coupled to the supply pump (10), the suction portion (56) configured to move fuel from the fuel tank (12) to the supply pump (10), the delivery port (58) configured to move fuel from the supply pump (10) to the high-pressure pump (16), and the hydraulic line (26) configured to provide a control pressure to the supply pump (10), and wherein one end of the hydraulic line (26) is coupled directly to the high-pressure region (18). 14. The fuel delivery device of claim 13, wherein the supply pump (10) includes a first control piston (48) and a second control piston (50), and wherein the control pressure impinges upon the first control piston (48) to change the quantity of fuel exiting the supply pump (10) through the delivery port (58). 15. A fuel delivery device for a fuel injection device of an internal combustion engine, having a supply pump (10) and at least one high-pressure pump (16), wherein the supply pump (10) delivers fuel from a fuel tank (12) to a suction side of the high-pressure pump (16) and the high-pressure pump (16) delivers fuel to a high-pressure region (18), characterized in that the supply pump (10) has a variable displacement, wherein the supply pump (10) has a constant speed of rotation such that the supply pump (10) is configured to deliver a variable quantity of fuel at the constant speed of rotation, wherein each of a hydraulic line (26), a suction port (56), and a delivery port (58) are coupled to the supply pump (10), the suction portion (56) configured to move fuel from the fuel tank (12) to the supply pump (10), the delivery port (58) configured to move fuel from the supply pump (10) to the high-pressure pump (16), and the hydraulic line (26) configured to provide a control pressure to the supply pump (10), and wherein one end of the hydraulic line (26) is coupled directly to a pressure regulator (15). 16. The fuel delivery device of claim 15, wherein the supply pump (10) includes a first control piston (48) and a second control piston (50), and wherein the control pressure impinges upon the first control piston (48) to change the quantity of fuel exiting the supply pump (10) through the delivery port (58). 17. A fuel delivery device for a fuel injection device of an internal combustion engine, having a supply pump (10) and at least one high-pressure pump (16), wherein the supply pump (10) delivers fuel from a fuel tank (12) to a suction side of the high-pressure pump (16) and the high-pressure pump (16) delivers fuel to a high-pressure region (18), characterized in that the supply pump (10) has a variable displacement, wherein the supply pump (10) has a constant speed of rotation such that the supply pump (10) is configured to deliver a variable quantity of fuel at the constant speed of rotation, wherein each of a hydraulic line (26), a suction port (56), and a delivery port (58) are coupled to the supply pump (10), the suction portion (56) configured to move fuel from the fuel tank (12) to the supply pump (10), the delivery port (58) configured to move fuel from the supply pump (10) to the high-pressure pump (16), and the hydraulic line (26) configured to provide a control pressure to the supply pump (10), and wherein one end of the hydraulic line (26) is coupled directly to a return line (8) that extends from an injector (20) to the fuel tank (12). 18. The fuel delivery device as claimed in claim 17, wherein the fuel is diverted into the return line (8) and to the fuel tank (12) by an overflow valve (34) on the suction side of the high-pressure pump (16). 19. The fuel delivery device as claimed in claim 17, wherein the fuel is diverted into the return line (8) and to the fuel tank (12) by a pressure regulator (22) in the high-pressure region (18).