Our company produces the XHM series crank continually long rod low speed great torque oil motor (five-star motor) carries on the production according to the Italian standard, the major parts by the processing center and the numerical control engine bed processing, all seals, the high strength in hexagonal screw by Germany, Italy, Taiwan import, the casting uses gathers the fat granulated substance casting modular cast iron, thus the guarantee product performance and the outward appearance quality surpass the domestic similar product level, it has following characteristic: 1. Uses the eccentric shaft and inspires lowly rate five piston structures, thus has the low noise characteristic. 2. Starting torques are big, the low-speed stability performance is good, can under the very low speed the steady revolution. 3. Patent technology plane compensation matches the flow table, the reliability is good, divulges few, between the plunger and the shell uses the packing ring seal, thus has the very high volumetric efficiency. 4. Between crank and connecting rod by pin bearing supporting, thus has the very high mechanical efficiency. 5. The hand of rotation is reversible, output shaft permission certain radial direction and axial external force. 6. Has the high power mass ratio, the volume weight relative small.