Abstract:To grasp the regulating performance of pressure differential valve,solve the problem of excessive pressure fluctuation of the lubricating oil system lubricating oil pump output and the oil supply,PumpLinx software was used to generate grid,and the influences of the flow valve hole diameter,damping hole diameter,spring stiffness and spring pre-tightening force on the dynamic characteristics,stability and following performance of pressure differential valve oil supply pressure were studied.The results show that the larger the diameter of the overflow hole is,the better the pressure regulating performance of the valve is,but too large overflow hole is easy to cause too much pressure overshoot;when the diameter of the damping hole is 1.5 mm,the transition time is the shortest,the pressure oscillation in the early stage is small,and the amplitude of stable fluctuation of pressure is moderate;when the spring stiffness is set as 3 N/mm and 4.8 N/mm,the pressure regulating effect is the best,and the pressure fluctuation deceleration value W is about 12%;with the increase of the spring preload,the transition time of pressure regulation becomes shorter,the pressure overshoot increases,on the contrary,it may cause the spool against the right end of the valve body,and lead to unsatisfactory pressure regulation effect.
