Abstract
Two-dimensional pumps have broad application prospects in aerospace. However, the performance of the pump is degraded because of the clearance problem of the current 2D transmission mechanism. In order to eliminate the clearance between the cam rail and the rollers, a high-speed transmission mechanism with a stacked roller set is proposed. The stacked roller set is compressed by the load pressure. The axial inertia force is balanced when the transmission mechanism works at high speed, via the equal acceleration and reverse movement of two cam rail sets. Thus, the transmission mechanism meets the high-speed demand. In this paper, the mathematical model of the transmission mechanism is established based on the enveloping surface theory and the differential geometry principle. Afterwards, numerical analysis of the mathematical model is performed based on MATLAB, combined with the experiment, to study the influence of load pressure and rotational speed on the torque loss. Then, the torque characteristics of the transmission mechanism is obtained. According to a test, the deviation between theoretical data and experimental data is 11.9%; therefore, the mathematical model can predict the torque of the transmission mechanism effectively. It is concluded that the torque loss of the transmission mechanism increases linearly with the load pressure, and the rotational speed has a slight effect on the torque loss.
Highlights
Axial piston pumps are widely used in aerospace by virtue of their high power density, strong load capacity and long service life [1,2]
An increment of the load pressure will result in an increase in the normal force Fa, which indicates that adjusting the load pressure can change the load capacity of the stacked roller set
How‐ ever, an increment of the load pressure will result in an increase in the normal force F, which indicates that adjusting the load pressure can change the load capacity of the stacked roller set
Summary
Axial piston pumps are widely used in aerospace by virtue of their high power density, strong load capacity and long service life [1,2]. The rotational motion and reciprocating linear motion are designed on a single piston, which achieves a high integration of oil discharge and distribution, so as to design hydraulic pumps with a high power-to-weight ratio. The overall architecture of the 2D transmission mechanism is mainly built of spatial conjugate cam The roller set undergoes axial reciprocating movement under the constraint of the cam rail set. High-pressure oil creates a pressure difference with the low pressure chamber inside, pressing the large end of the roller shaft, so that the N cone rollers are attached to the cam rail surface closely. To describe the spatial relationship between the cone roller and the cam rail via homogeneous coordinate 3.
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