References Which were useful? Sources Fluid Power with Applications; Anthony Esposito Basics of Hydraulic Systems Qin Zhang Hydraulic and Pneumatics Ed. 1

Read Ed. 1 Chapter 15: Actuators

Schedule Week of 3/26 Wednesday: Install Fluids & Energy lab equipment Test 2A Thursday:

Piston Cushion nose Cylinder cap Stroke volume Cushion orifice Throttle Cushion adjustment screw Mother Non-return valve Gas valve

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 p2, pressure in the cushion chamber.

Example What force is needed to lift 6000lb load in a direction 30o from horizontal?

Example L1= L2=10”  = 0o Fload=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 10in3/rev Pressure 1000psi Speed 2000rpm Actual flow rate 95gpm Actual torque 1500inlb Find overall efficiency