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JABATAN KEJURUTERAAN MEKANIKAL, PSP JABATAN KEJURUTERAAN MEKANIKAL, PSP 2 HOW DO HYDRAULIC JACKS WORK? HOW IT’S FUNCTION???
JABATAN KEJURUTERAAN MEKANIKAL, PSP JABATAN KEJURUTERAAN MEKANIKAL, PSP 3 HOW DO HYDRAULIC JACKS WORK? • Hydraulic jacks are essential tools in various industries that help with heavy lifting of different kinds of weights. • These jacks use the power of hydraulic fluid or oil to move or lift heavy loads. • The main mechanism of applying force differs from the jack type used, but it generally relies on a hydraulic cylinder or a screw thread. • Typically, hydraulic jacks have two cylinders of different sizes that are connected with a pipe. • The hydraulic fluid is then forced into these cylinders by a plunger. • When the plunger moves forward, oil gets pushed into the cylinder, and when you pull the plunger backward, the hydraulic fluid gets pulled into the pump chamber. • The combination of these movements delivers enough pressure to power the hydraulic jack.
JABATAN KEJURUTERAAN MEKANIKAL, PSP JABATAN KEJURUTERAAN MEKANIKAL, PSP 4 HOW DO HYDRAULIC JACKS WORK? Hydraulic Jack Brake System
JABATAN KEJURUTERAAN MEKANIKAL, PSP JABATAN KEJURUTERAAN MEKANIKAL, PSP 5 THE WORKING PRINCIPLE OF HYDRAULIC JACKS • Hydraulic jacks work based on Pascal’s principle. • Blaise Pascal, a French scientist, developed this principle over 350 years ago and it has become the backbone of fluid mechanics. • As per Pascal’s principle, pressure exerted at any point on liquid in a container gets transmitted to all other parts of the liquid without any loss. • This means the pressure at the top of a container and the one at the bottom will be equal. px Pz Py
JABATAN KEJURUTERAAN MEKANIKAL, PSP JABATAN KEJURUTERAAN MEKANIKAL, PSP 6 Hydraulic Car Lift Apply a force F1 here to a piston of cross-sectional area A1 . The applied force is transmitted to the piston of crosssectional area A2 here
JABATAN KEJURUTERAAN MEKANIKAL, PSP JABATAN KEJURUTERAAN MEKANIKAL, PSP 7 At the same level P1 = P2 F1 / A1 = F2 / A2 (V = A x D) A1 x D1 = A2 x D2
JABATAN KEJURUTERAAN MEKANIKAL, PSP JABATAN KEJURUTERAAN MEKANIKAL, PSP 8 The larger piston below the smaller piston P2 = P1 + ρgh F2 /A2 = F1 /A1 + ρgh
JABATAN KEJURUTERAAN MEKANIKAL, PSP JABATAN KEJURUTERAAN MEKANIKAL, PSP 9 The smaller piston below the larger piston P1 = P2 + ρgh F1 /A1 = F2 /A2 + ρgh
JABATAN KEJURUTERAAN MEKANIKAL, PSP JABATAN KEJURUTERAAN MEKANIKAL, PSP 10 Examples of a Hydraulic System in everyday life Hydraulic jack for lifting car up for any repair
JABATAN KEJURUTERAAN MEKANIKAL, PSP JABATAN KEJURUTERAAN MEKANIKAL, PSP 11 Examples of a Hydraulic System in everyday life Brakes of cars use hydraulic system
JABATAN KEJURUTERAAN MEKANIKAL, PSP JABATAN KEJURUTERAAN MEKANIKAL, PSP 12 Examples of a Hydraulic System in everyday life Cranes used during construction of any project
JABATAN KEJURUTERAAN MEKANIKAL, PSP JABATAN KEJURUTERAAN MEKANIKAL, PSP 13 Examples of a Hydraulic System in everyday life In some theatres, they use hydraulic systems to raise and lower the curtains.
JABATAN KEJURUTERAAN MEKANIKAL, PSP JABATAN KEJURUTERAAN MEKANIKAL, PSP 14 Examples of a Hydraulic System in everyday life Office chairs use hydraulic systems to lift or lower or lean back the seats.