SAI Motori Idraulici SpA

GS-series features High speed The S-series high speed motors have max speeds which are 2-3 times higher than those normally expected in LSHT motors. Low speed The radial piston design ensures excellent low speed characteristics. High specific speed range The ratio (max.speed): (min.speed) is higher than any other type of equivalent hydraulic motor, giving greater flexibility of application. High power ratings The rugged design of the motors and their high operating efficiency enable high continuous powers to be transmitted. Disc Cage Hydraulic motor makes the most of speed with disc cage on crankshaft central roller bearing. This particular kind of cage offers two ematkable advantages, compared to most of the cages available on the market: -minimize heat generation, due to the reduced friction area; -maximize heat dissipation, as surfaces of the rolling parts are easier to flux. The high speed capability, with equivalent high power ratings, is possible due to the following factors: Forced lubrication of all load-bearing surfaces - hydraulic balancing of piston foot, cylinder trunnion and distributor rotor; Low sliding speeds of load bearing surfaces - compact distributor rotor, central piston support bearing, cylinder trunnions. High dynamic stability of the pistons- the sleeves of the oscillating cylinder have been extended so giving the piston added directional guidance. Also, the lightweight, single-component design of the piston minimises the effects of inertial forces at high speeds. The stability of the piston is further helped by the spherical surface of the piston-support ring which favours self-centring of the piston at high speed and eliminates stick-slip phenomena at low speeds. Mechanical, non-elastic piston guidance design- the pistons follow the shaft eccentric without separation and hammering under all normal and anomalous hydraulic or mechanical operating conditions (cavitation, high case pressure, vibration, centrifugal forces.