High-pressure fuel pump
AssigneeRobert Bosch GmbH
InventorsZiang Dong, Xiaoyan Jiang, Yingsa Huang
Life of this patent
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Abstract
A high-pressure fuel pump includes a drive shaft, and a vane pump and a plunger pump which are driven by the drive shaft. The vane pump is configured to supply pre-pressurized fuel to the plunger pump. The drive shaft includes a cam configured to drive a piston rod of the plunger pump such that the plunger pump alternately executes a fuel suction stroke and a fuel discharge stroke. The drive shaft further includes a shaft portion for driving a rotor of the vane pump. The vane pump is configured such that for each fuel suction stroke of the plunger pump the vane pump provides a fuel supply cycle that is advanced by a phase angle relative to the fuel suction stroke.
Claims10
A high-pressure fuel pump, comprising:
- a drive shaft;
- and
- a vane pump and a plunger pump which are driven by the drive shaft, the vane pump being configured to supply pre-pressurized fuel to the plunger pump;
- wherein the drive shaft comprises a cam configured to drive a piston rod of the plunger pump such that the plunger pump executes a working cycle consisting of a fuel suction stroke and a fuel discharge stroke alternating with each other,
- wherein the drive shaft further comprises a shaft portion for driving a rotor of the vane pump,
- wherein the vane pump is configured such that for each fuel suction stroke of the plunger pump the vane pump provides a fuel supply cycle that is advanced by an advance phase angle greater than 0° relative to the fuel suction stroke, and
- wherein the vane pump comprises multiple radially slidable vanes borne by the rotor, the multiple vanes being uniformly distributed at equal angular intervals, and a range of values of the advance phase angle is greater than 0° and less than half of an included angle between two vanes adjacent to each other in the circumferential direction.
Dependencies are inferred from the claim text.