Network optimization information:
The speed change mechanism is composed of adjusting screw 6, feedback spring 7 and 8, control piston 9, push rod 10, reversing valve element 11, etc. installed in the rear cover. The control piston 4 is a trapezoidal plunger. The big end of the control piston is provided with a transverse hole, in which there is a shift pin. The left end of the shift pin is matched with the central hole of the port plate, and the right end of the shift pin is sleeved on the guide rod. The control piston slides up and down, Cycloid hydraulic motor The valve plate can slide along the arc slide of the rear cover, thus changing the included angle between the cylinder axis and the main shaft. Therefore, when the spindle speed is fixed, Hydraulic cycloid motor The output flow can be changed, that is, when the swing angle is larger, the output flow is larger; When the swing angle is small and the output flow is small, frequency conversion can be realized.
How does the variable piston move up and down in the rear cover? In this design, the upper chamber of the control piston is the high-pressure oil through the oil passage and the pressure oil port, and the high-pressure oil is connected between the two stages of the reversing valve core. The two sectional areas of the connection between the reversing valve spool and the high-pressure oil pipe are different. When the pressure of the high-pressure oil pipe is less than the set value, the pressure oil pipe acts on the pilot piston, and the force pushing the guide rod to the control valve spool is less than or equal to the force of the adjusting spring. The high-pressure oil pipe is sealed by the two stages of the control valve spool, while the high-pressure oil pipe cannot pass through the large cavity where the variable speed piston is located. In this process, the upper chamber of the variable piston is high and the lower chamber is low. Under the effect of the pressure difference, the variable piston is at the lower end, that is, at the swing angle. At this time, the flow is the most.
