Hydraulic Systems - Hydraulic Systems Chapter 11 Material...

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1 Hydraulic Systems Chapter 11 Material taken from Goering, 2003, Of -Road Vehicle Engineering Principles Basic Principles ± Hydraulic fluids are virtually incompressible at the pressures used in hydraulic systems. ± Liquids transmit pressure equally in all directions. ± The next slide is an illustration of a hydraulic jack. Basic Principles con’t ± By applying a downward force on the small piston, the jack can be made to lift a heavy mass on the large piston. ± The liquid fills the entire volume between the two pistons, and because it is incompressible, some liquid must move into the large piston chamber when the small piston is pushed downward. Goering, 2003, Of -Road Vehicle Engineering Principles
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2 Basic Principles con’t ± The pressure beneath the small piston is equal to F 1 / A 1 . ± The same pressure acts on the large piston because the liquid transmits pressure equally in all directions. ± Because A2 > A1, the force on the large piston is much larger than the force on the small piston. Pump Systems ± Open loop: provides cooling medium ± Closed Loop: temperature build up Vickers, Mobile Hydraulics Manual Lab-Volt, Hydraulic Trainer Manual
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Standard Symbols ± Hydraulic circuit symbols were standardized by the NFPT and by the International Standards Organization (ISO). ± The small arrow on the pump symbol indicates pressurized oil is being forced into the motor. ± Drawing an arrow through a component indicates the component is variable rather than fixed. Standard Symbols con’t ± Although most hydraulic systems have only one reservoir, the symbol can be used at more than one place on a drawing of a hydraulic circuit to eliminate the need to draw numerous return lines. ± This is analogous to the drawing of electrical circuits, where the electrical ground symbol can be used at many places in a circuit drawing. Electric – Hydraulic Analogy
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Hydraulic Systems - Hydraulic Systems Chapter 11 Material...

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