Abstract: A new concept named two-dimensional fuel pump with balanced inertia force balanced is proposed. The pump integrates the flow distribution mechanism on the piston and the piston ring, eliminating the independent flow distribution mechanism of the traditional piston pump, and simplifying the structure of the fuel pump. The axial reciprocating movement of the piston and the piston ring in the opposite direction increases the discharge stroke of the pump without changing the volume, and further improves the power density ratio of the fuel pump. The guide surface of the fuel pump adopts equal acceleration and deceleration curved surfaces, and uses the balancing group to perform reciprocating motion with the same acceleration and opposite direction as that of the driving group to balance the inertial force generated by the driving group at high speed, providing a kind of possibility of high-speed fuel pump. Based on the principle of the pump, the effects of internal leakage, external leakage, and oil compressibility that cause volume loss are analyzed. AMESIM is used to establish a simulation model of the pump for theoretical analysis and comparison with the experimental results for verification. The experiment shows that when the load pressure is 1 MPa, the speed is increased from 1 000 r/min to 7 000 r/min, the volumetric efficiency is increased from 91.6% to 97.8%, and the theoretical deviation is about 3%; when the speed is 2 000 r/min, the load pressure increases from 1 MPa to 6 MPa, the volumetric efficiency decreases from 94.6% to 87.5%, and the theoretical deviation is around 5%. Correctness of the theoretical analysis is thus verified.

Key words: two-dimensional fuel pump, balanced inertia force, leakage loss, compression loss, AMESIM, volumetric efficiency