Design and justification of hydrostatic transmission parameters for special transport vehicles

Abstract

Traditionally, hydrostatic transmissions of specialised transport vehicles use piston hydraulic machines to move the vehicle, as well as to operate attachment systems and units. For a wide range of special vehicles used in agriculture and municipal services, movement requires the power of the drive motor, comparable to the power of gear hydraulic machines. Gear hydraulic machines are less demanding on the quality, viscosity, and purity of the working fluid, are cheaper, and are easier to operate. Regulation of speed of an output shaft of gear hydraulic motors, as a rule, is provided by the throttle method that considerably reduces the general efficiency of a hydraulic drive. In the article the project of hydrostatic transmission on the basis of gear hydraulic machines with "volumetric" way of regulation is offered, the basis of which is the combination of work of two hydraulic motors (gerotor and gear with external gearing) with connection of output shafts of hydraulic motors to axes of gear differential. The basic calculation dependencies for determining the operating parameters of transmission hydraulic machines are given.