Crank connecting rod type Low speed high torque oil motor It is used earlier and is called overseas Stafford hydraulic motor 。 The same product model in China is JMZ type, with a stable working pressure of 16 Mpa and a higher working pressure of 21 Mpa. The theoretical research shows that the displacement can reach 6.140 r/mln. Crank connecting rod type Oil motor The motor is composed of a housing, a crank connecting rod piston component, an eccentric shaft and an oil distribution shaft. Five cylinder blocks are evenly arranged in a radial arc on the inner edge of the housing 1 to form a star shaped housing; The cylinder is equipped with a piston 2. The piston 2 is connected with the connecting rod 3 through a ball hinge. The big end of the connecting rod is made into a saddle cylinder roof tile which is close to the eccentric circle of the transmission shaft 4. The center point of the circle is, which is the eccentricity moment of the transmission shaft rotation center. The flow distribution shaft 5 of the oil motor is connected with the transmission shaft through a cross key and rotates with the transmission shaft, The working pressure oil of the motor is distributed to the corresponding piston hydraulic cylinder through the port shaft channel. The four and five cavities of the hydraulic cylinder are connected with working pressure oil, and the piston will be affected by the working pressure oil; In other piston hydraulic cylinders, hydraulic cylinder 1 is in an excessive state, and the hydraulic cylinder is connected with the oil drain window. Three; According to the operating principle of the crank connecting rod mechanism, the plunger under the action of hydraulic pressure drives the transmission shaft to rotate around the rotation center by applying a force N to the center point of the eccentric circle, and outputs the rotation speed and torque to the outside. If the oil inlet and outlet are interchanged, the oil motor will rotate in the opposite direction. With the rotation of the rotating shaft and the distribution shaft, the status of the distribution changes. During the whole rotation process of the transmission shaft, the capacity of the hydraulic cylinder at the high pressure side gradually increases, while the capacity of the hydraulic cylinder at the non high pressure side gradually decreases. Therefore, during operation, the high pressure oil continuously enters the oil motor, and then is continuously discharged from the non high pressure chamber.

In a word, since the orientation of the excessively closed spacing of the distribution shaft and the eccentricity orientation of the transmission shaft are the same, they rotate together, so the oil inlet window of the distribution journal is always facing two or three hydraulic cylinders on one side of the eccentricity line, and the oil suction window is facing other hydraulic cylinders on the other side of the eccentricity line, The total output torque is the sum of the torque generated by any plunger on the center point of the drive shaft, which makes the rotation run enough to keep going down. What is discussed above is the condition that the casing is fixed and the shaft rotates. If the shaft is fixed, the inlet and outlet oil can be directly led to the port shaft, which can realize the purpose of casing rotation and form the wheel motor.