brief introduction
Low speed high torque hydraulic motor It refers to those with low rotation speed but high output torque Hydraulic motor It is mainly applicable to injection molding processing machinery, ships, hoists, engineering machinery and equipment, construction machinery, mining equipment, mining equipment, metallurgical equipment, ship accessories, petrochemical equipment, ship machinery, etc. Traditionally, hydraulic motor refers to a mechanical transmission device that outputs rotary motion and converts hydraulic energy provided by hydraulic pump into mechanical energy. And low speed High torque hydraulic motor It refers to the hydraulic motor with low rotation speed but large output torque, which is mainly applicable to injection molding machinery, ships, hoists, engineering machinery, construction machinery, mining equipment, mining equipment, metallurgical equipment, ship accessories, petrochemical equipment, ship machinery, etc.
working principle
The crank connecting rod type low speed high torque hydraulic motor was used earlier, and is called Staffa hydraulic motor abroad. The similar model in China is HTM, with rated pressure of 16MPa, higher pressure of 21MPa, and larger theoretical displacement of 6.140r/min. The low-speed high torque hydraulic motor is composed of a housing, a crank connecting rod piston assembly, an eccentric shaft and an oil distribution shaft. Five cylinder blocks are arranged radially and symmetrically along the circumference of the housing to produce a star shaped housing; The cylinder body is equipped with a piston. The piston is connected with the connecting rod through a ball hinge. The big end of the connecting rod is made into a saddle shaped cylindrical pad which is closely attached to the eccentric circle of the crankshaft. It is connected with the eccentric moment of the crankshaft rotation center. The distribution shaft of the hydraulic motor is connected with the crankshaft through a cross key and rotates with the crankshaft. The pressure oil of the motor passes through the distribution shaft channel and is arranged by the distribution shaft to the corresponding piston cylinder, The four and five cavities of the oil cylinder are filled with pressure oil, and the piston is affected by the pressure oil; In other piston cylinders, cylinders 2 and 3 are connected with the oil drainage window in a transitional state; According to the movement principle of the crank connecting rod mechanism, the plunger under the action of oil pressure will use a force on the center of the eccentric circle to drive the crankshaft to rotate around the rotation center, and output speed and torque. If the oil inlet and outlet are changed, the hydraulic motor will rotate in the opposite direction. With the rotation of drive shaft and port shaft, the port state changes. During the crankshaft rotation, the volume of the oil cylinder at the high-pressure side gradually increases, while the volume of the oil cylinder at the low-pressure side gradually decreases. Therefore, the high-pressure oil continues to enter the hydraulic motor during use, and then continues to be discharged from the low-pressure chamber.
In general, since the position separated from the transition seal of the flow distribution shaft is in the same direction as the eccentricity of the crankshaft and rotates at the same time, the oil inlet window of the flow distribution journal is always facing the two or three oil cylinders on one side of the eccentric line, and the oil suction window is facing the rest of the oil cylinders on the other side of the eccentric line. The total output torque is the sum of the torque formed by all the pistons on the center of the crankshaft, This torque enables the slewing motion to continue.
