First, the sliding friction is dimensionally unstable. Generally, the sliding friction force increases with the increase of speed. However, when the speed increases during operation, the internal friction force of the motor running in the stationary and low-speed regions does not increase, but instead decreases, becoming the friction force. on the other hand, Hydraulic motor The working pressure increases after the hydraulic engine is shrunk.

Second, the leakage size is unstable. Hydraulic motor of scissors truck The leakage of the hydraulic motor is not the same every moment. It fluctuates regularly with the change of the phase difference angle of the motor rotor. As the total flow into the motor is relatively small at low gear, the leakage accounts for a large proportion, Special hydraulic motor for construction machinery The instability of the leakage will significantly affect the total flow scale value of the motor during operation, so the speed ratio is unstable.

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