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Lesson. Using Hydraulic Systems. Interest Approach. Have you ever used a floor jack or driven an automobile equipped with power brakes or power steering?. Student Learning Objectives. Define hydraulics and explain its major operating systems. Discuss the basic principles of hydraulics.

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  1. Lesson Using Hydraulic Systems

  2. Interest Approach • Have you ever used a floor jack or driven an automobile equipped with power brakes or power steering?

  3. Student Learning Objectives • Define hydraulics and explain its major operating systems. • Discuss the basic principles of hydraulics. • Describe the primary components of a hydraulic system. • Describe the advantages and disadvantages of hydraulic systems.

  4. Connectors Cycle time Directional control valve Energy Filter Flow rate Hydraulic actuator Hydraulics Hydrodynamics Hydrostatics Law of Conservation of Energy Linear actuator Terms

  5. Micron Multiplication of force Pascal’s Law Piping Positive displacement pump Pressure gauge Pressure relief valve Prime mover Pump Reservoir Rotary actuator Strainer Terms

  6. Hydraulics • A branch of physics dealing with the mechanical properties and practical applications of fluids in motion. • Hydraulic systems do not create power.

  7. Hydraulics • They transfer power from an outside source. • Prime mover – the outside source of power.

  8. Hydrodynamics • The use of liquids at high flow and low pressure to perform work.

  9. Hydrostatics • Use of liquids at high pressure and low flow to perform work.

  10. Pascal’s Law • Pressure applied to a confined fluid is transmitted undiminished in all directions.

  11. Application of Pascal’s Law

  12. Multiplication of force • The hydraulic system takes a small input force and transforms it into a larger output force.

  13. Cycle time • The amount of time required for one complete set of operations to occur. • Flow rate – the measure of how many gallons per minute of hydraulic fluid would run into a container.

  14. Law of Conservation of Energy • Energy may be changed from one form to another, but it cannot either be created or destroyed. • Energy – the capacity to do work.

  15. Components of a Hydraulic System • Reservoir – supplies oil to the hydraulic pump and stores oil that returns after passing through the hydraulic circuit. • Strainer – directs the hydraulic oil in a straight line through an element made of metal screens attached to a metal core. • Filter – directs hydraulic oil through one of more layers of a porous elements that may trap particles. • Micron – equal to 39 millionths of an inch.

  16. Primary Components of a Hydraulic System

  17. Components (continued) • Pump – causes hydraulic oil to flow through the circuit • Positive displacement pump – delivers the same volume of oil per cycle regardless of the pressure at the pump outlet.

  18. Components (continued) • Pressure gauge – measure and shows the pressure being produced in a hydraulic system.

  19. Abourdointubepressuregauge

  20. Components (continued) • Directional control valve – controls the operation of the system’s cylinder sand motors by direction the flow of the fluid in the system.

  21. Primary parts of a typical cylinder

  22. Components (continued) • Hydraulic actuator – converts fluid energy into mechanical energy. • Linear actuator – the output of the cylinder occurs in a straight-line manner. • Rotary actuator – produces a rotating output force.

  23. Components (continued) • Piping – fluid conducting lines that connect various components of a hydraulic system. • Connectors – used to join one piece of piping to another, or to hydraulic system components.

  24. Advantages of hydraulic systems • Increased flexibility • Variable speed • Multiplication of force • Reduced wear • Reversibility

  25. Disadvantages of hydraulic systems • High pressure • Need for cleanliness • Safety hazards

  26. Review / Summary • What is hydraulics and what are its major operating systems? • What principles govern the use of hydraulics? • What are the primary components of a hydraulic system? • What are the advantages and disadvantages associated with hydraulic systems?

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