Founded by the Pecorari brothers in Italy in 1964, the core business of SAI Hydraulics continues to be the production of crankshaft design radial piston motors, planetary gearboxes, brakes, and related accessories…
SAI hydraulics radial piston motors are available in an extensive range of displacements from 40 cc/rev through to 1200 cc/rev and in nine basic frame sizes. Options include variations on shafts, flanges, bearings, distributors, high pressure shaft seals, and competitor interchangeability.
SAI’s radial piston motor design differs to others due to its: Swivelling cylinder, piston retaining ring, axial rotary valve and interchangeable distributors.
- Swivelling cylinder – This enables the cylinder to remain aligned with the eccentric of the crankshaft, thus eliminating any side loading between the piston and cylinder;
- Double piston support bearing – The pistons transmit their load to the shaft via a hydrostatic bearing which reduces metal to metal contact, and a central roller bearing which minimises the sliding velocity between piston and the spherical support ring;
- Piston retaining rings – These ensure that the piston remains in contact with the shaft under all operating conditions, including in cavitation;
- Axial flow rotary distributor – This ensures that the oil is distributed to the pistons with high efficiency due to short, large section oil paths. Many different distributor options can be fitted to any of the range of SAI hydraulics motors.
SAI hydraulics GM Series (fixed displacement), GS Series (high speed-high power), BD & GD series (dual displacement)