The speed ratio of the hydraulic motor is calculated as described above. Theoretically, the speed ratio should be uniform. However, when the speed ratio of the hydraulic motor reducer is too low during operation, the maintenance and servicing of the hydraulic motor reducer usually fail to achieve uniformity, resulting in an unstable condition that is sometimes fast, sometimes slow, and sometimes stops. This is what we call the grasping condition of the hydraulic motor. The friction resistance increases with the increase of the speed, while the friction resistance in the motor working in the stationary and low-speed gear area does not increase but decreases when the speed increases, resulting in the friction resistance with "negative characteristics" in short. On the other hand, the oil motor and load are pushed by the pressure increase after the automobile oil is reduced, Therefore, the data model can be used to describe the whole working process of the oil motor in the low-speed gear area: handle the "negative" friction fitness exercise with a small block of quality M (equivalent to the internal friction and load quality of the motor, torque formula) with an average speed of V0 pulling the yellow end of the compression spring (its yellow end becomes smaller, which can be equivalent to the four pillar hydraulic function of the working compound with compressibility under high pressure).

When the quality M is standing still or the speed is very low, the friction resistance is large, and the elastic yellow continues to decrease. The growth rate is mechanical kinetic energy, and the torque is increased. The hydraulic motor reducer has just started to exercise until the spring yellow becomes smaller until its torque is equivalent to the rolling friction, that is, u>0. However, once the small object starts to exercise, the friction of the swing cylinder hydraulic motor suddenly decreases, and the smaller one can be released immediately. The small object suddenly speeds up its drag, and the effect is to reduce the amount of the elastic yellow and the torque. The small object moves for a distance with the torque formula, and then stops until the movement of the torsion spring makes the elastic yellow smaller, the torque increases, and the small object moves pleasantly again.