Estimation and ways of mechanical efficiency upgrading of planetary rotary hydraulic machines

Abstract

Planetary rotary hydraulic machines (PRHM) with wavelike sun wheels and floating satellite wheels have high technical characteristics but they are understudied. The article is devoted to the estimation of energy efficiency of PRHM at the stage of their projecting. Calculated formulas for the pump and hydraulic engine are offered. The comparative estimation of schemes with the numbers of waves М×N: 2×2; 3×3; 4×4; 2×4; 4×6, has shown efficiency values close to each other a little bit more than 0.9. The reserve for efficiency upgrading for the considered hydraulic machines is the use of the teeth with half-round convex-concave side surfaces.