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

4. Read
Ed. 1 Chapter 15: Actuators

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

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

9. 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 Pressure relief valve set at 750psi. Determine p2, pressure in the cushion chamber.

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

14. Example
L1= L2=10”
 = 0o
Fload=1000lb
Applied Load ?

15. 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

16. Hydraulic motors Oscillating motor Continuous motor Bidirectional
Fixed or variable displacement
Gear
Vane
Piston

17. Hydraulic motor performance
Torque
Power
Motor speed
Overall efficiency

18. Example Volumetric displacement 10in3/rev Pressure 1000psi
Speed 2000rpm
Actual flow rate 95gpm
Actual torque 1500inlb
Find overall efficiency