Example Oil delivered from a pump at 18.2gpm. Cylinder bore = 3”. Piston has 1” diameter cushion plunger, 0.75” in length. Piston driving a 1500lb weight in horizontal direction; coefficient of sliding friction, , is 0.12. Pressure relief valve set at 750psi. Determine p 2, pressure in the cushion chamber.
Example What force is needed to lift 6000lb load in a direction 30 o from horizontal?
Example L 1 = L 2 =10” = 0 o F load =1000lb Applied Load ?
Rotary Actuator Requirements A driving surface subject to a differential pressure Ports to direct fluid to driving surface to obtain rotation and to exit the motor A mechanical connection between surfaces and output shaft
Hydraulic motors Oscillating motor Continuous motor Bidirectional Fixed or variable displacement Gear Vane Piston
Hydraulic motor performance Torque Power Motor speed Overall efficiency
Example Volumetric displacement 10in 3 /rev Pressure 1000psi Speed 2000rpm Actual flow rate 95gpm Actual torque 1500inlb Find overall efficiency