Research on the influence factors about the pressure transformation ratio of angle type hydraulic transformer

The mathematic models of displacement, angular torque and pressure transformation ratio about angle type hydraulic transformer were built. The derivative relationship between pressure transformation ratio and pressure of feed circuit, flow of load circuit and viscosity were deduced respectively. Based on it, the influence characteristics of the three factors on pressure transformation ratio were got. The result of analysis and test shows that rotations of valve plate influence the role of pressure of feed circuit on pressure transformation ratio, the increment of pressure of feed circuit may bring increment, decrease, or nothing to pressure transformation ratio with different rotation of valve plate. The increment in flow of load circuit results to decrease the pressure transformation ratio, while the decrease in viscosity results to decrease pressure transformation ratio. And there is one maximum point in the process of increasing pressure transformation ratio, and more flow of load circuit can make the time of maximal point of pressure transformation ratio appear more early.