The Sai hydraulic motor is claimed to be able to achieve an energy conversion rate of up to 90%.
The motor's efficiency is achieved by design features including a sealed piston arrangement, along with an axial distributor design which increases volumetric efficiency. The spherical roller bearing assembly in the crankshaft design reduces mechanical drag and therefore increases mechanical efficiency, especially at start-up.
The Sai series features a range of motors suitable for a variety of applications. The range includes: the GM, GS, GMD, B and GD series.
The GM series is a series of motors with high continuous power ratings, both because of the reduced internal specific loads and because of the high mechanical and volumetric efficiency that contribute in reducing the amount of heat produced and therefore also the negative effects associated with it.
The main characters of the GS series are high mechanical efficiency, especially at start-up, and high volumetric efficiency.
The GMD series motor, with its high-performance characteristics and double output shaft configuration, is suitable for applications such as axle drives, winch drives and tandem motor applications, such as multi-speed drive units and flow divider units.
The B series five cylinder features a sliding central bearing arrangement design. This series allows the possibility to change displacement; fit taper roller bearings for axial load capability; have a hollow through shaft option; and fit a counterbalance weight to smooth out high-speed vibration.
The GD series is a crankshaft design radial piston hydraulic motor based on a nine-cylinder design. The nine cylinders design provides a smooth output torque. The variable shaft eccentric is based on a simple reliable mechanism.