Hydraulic motors

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Transcript of Hydraulic motors

  • 1. Hydraulic Motors Brought to you by:Demetri PreonasGreg Unverferth

2. Overview of Lesson How they work Types of Motors Performance Applications 3. How a hydraulic motor works High pressure fluid isused to turn a shaft. This is done in manydifferent ways. Much like a cylinderthe power comes fromthe pressure actingover a large area andcreating a large force. 4. Types of Hydraulic Motors Gear Motors Vane Motors Piston Motors Limited Rotation Actuator 5. Gear Motors External Gear MotorModel 21300 B1 Series Gear Motor 2 rotating gears, the Eaton Heavy Duty Series 1 Variable Motorarea of the gear teeth iswhere the pressure actsto create force Both gears turnsimultaneously One gear is connectedto the output shaft andthe other is an idler. 6. Gear Motors Internal Gear Motors Two categories Direct drive gerotor, works much like a rotary engine. Two gears, an inner and an outer. The pressure pushes them around a center point, turning a shaft 7. Vane Motors Spring loaded vanesare connected to arotor The rotor turns insidea cam ring (ellipticalhole) The vanes slide in andout of the slots in therotor to make contactwith the cam wall. 8. Piston Motors Many different types of piston motors All of them use the same basic principles Much like a cylinder, only turns a shaft likethe cylinders in your car engine. Generally the most efficient High power, high speed, high pressure 9. Piston Motors Most efficient Often used inaerospace applicationsdue to high power toweight ratio 10. In-line Piston Motors Simple construction Low cost Used in low torquehigh speedapplications, such asmachine tools 11. Radial Piston Motors High Torque Low speed Possible applicationcould be a roller. 12. Bent Axis Piston Motor Is one example of variabledisplacement motor. The angle is altered tochange the displacement. 13. Limited Rotation Actuator Also sometimes calleda oscillator. Has limited movement High torque 14. Performance Efficiency Effv= (rpmact/rpmtheo) * 100 Effv= volumetric efficiency Two factors Internal leakage Effm= (Tact/Ttheo) * 100 Volumetric efficiency Effm= Mechanical efficiency and speed decrease due to leakage. Effoa=(Effv/100)*(Effm/100)*100 Effoa= Over All Efficiency Internal friction Mechanical efficiency loss due to torque loss 15. Performance The mechanical torque The rpm desired mustdesired must be be specified in order tospecified in order to find required flowfind required working rate.pressure. Q= (rpm * Disp.)/231 Pin= (T*2)/Disp. 16. Power Hpout= (Tlb-ft * rpm)/5252 Effoa= (Hpout * 100)/ Hpin 17. You just learned: How a hydraulic motor works The basics of the different types of motors Some possible applications for hydraulicmotors How to calculate power How to find efficiency