Influence of the Radius of Curvature of the Teeth on the Geometric and Functional Parameters of the Rotors of the Planetary Hydraulic Motor

Using planetary (orbital) hydraulic motors is advisable in drives with low rotational speed and high torque. The issue of stabilizing the output characteristics of these hydraulic motors by studying the effect of the radius of the curvature of teeth on a change in geometric and functional parameters is relevant. As a result of the research, a calculation scheme and a mathematical apparatus have been developed that describe the relationship between the geometric and functional parameters of the rotors, taking into account the influence of the radius of curvature of their teeth. The study found that for the nominal value of the tooth radius 4.5 mm, the gap in the critical pair is 0.02 mm, which borders on a shape error and leads to the jamming of the rotors. An analysis of the change in gaps between the corresponding pairs of teeth during wear shows that the range of their change in the critical pair of teeth (0.022–0.169 mm) is much less than in the pair located diametrically opposite (0.040–0.736 mm). Therefore, the possibility of jamming is not excluded under operating conditions due to the error in manufacturing gear contours. It has been established that the obtained patterns of influence of the radius of curvature of the planetary hydraulic motor rotor teeth on the change in its geometric and functional parameters will stabilize the planetary hydraulic motor output characteristics and ensure the efficient operation of these hydraulic machines.