Abstract
Since the clearance between the guide rail and the roller reduces the efficiency of the 2D pump, this paper proposes a novel 2D piston pump with stacked taper roller sets to eliminate the effect of the clearance. The structure of the 2D pump is introduced, and the mathematical model of the torque and the mechanical efficiency of the bilateral force on the guide rail are established and analyzed. The model takes into account the change in the oil viscosity, the spatial angle and the oil churning loss. A test rig was built to test the mechanical efficiency under different operating conditions. The unilateral and bilateral force models of the guide rail were compared, which proved that the bilateral force model of the guide rail can predict the mechanical efficiency more accurately than the unilateral force model. In the case of high load pressure, there was a clearance between the test results and the model calculation results. It is speculated that the main reason for this is that the greater oil pressure causes the size of the contact area between the two taper rollers and between the taper roller and the guide rail to become larger. The resulting rolling friction coefficient becomes larger, which affects the mechanical efficiency.
Highlights
The hydraulic pump is the core component of the hydraulic system, which converts mechanical energy into hydraulic energy
The specific reason is that the guide sets are subjected to the opposite support force to the direction of rotation when rotating, which causes the torque of the bilateral force model of the guide rail to be greater than that of the unilateral force model
The mechanical efficiency model established based on the bilateral force of the guide rail is closer to the test results than the unilateral force model
Summary
The hydraulic pump is the core component of the hydraulic system, which converts mechanical energy into hydraulic energy. Where b is the angle of the projection of the contact line onto the bottom surface of the tapered roller, β is the half taper angle, D2 and D3 are the effective pressing surface diameters of the left and right taper rollers, and θN is the angle between the component of positive pressure of the balanced guide set and the Y3 axial unit vector. N2 4 3 where b is the angle of the projection of the contact line onto the bottom surface of the tapered roller, β is the half taper angle, D2 and D3 are the effective pressing surface diameters of the left and right taper rollers, and θN’ is the angle between the component of positive pressure of the balanced guide set and the Y3 axial unit vector. 2π(Ti + Ts + Tc) where VD is the 2D pump displacement, and Ti is the average value of the torque received by the two guide sets
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