Theory of Machines: Unit II: Gears and Gear Trains
effect of pressure angle
Gears and Gear Trains - Theory of Machines
The three standard pressure angles generally used are 14 ½°, 20%, and 25°
EFFECT OF PRESSURE ANGLE • The three standard pressure angles generally used are 14 ½°, 20%, and 25° • Because the pressure angle affects the shape of a tooth, two mating gears must have the same pressure angle. • Gears with smaller pressure angles efficiently transfer torque and apply lower radial loads onto the shaft and supporting bearings. However as the pressure angles are reduced, a greater tendency exists for gear tooth to interfere as they engage. • The larger pressure angle makes teeth with a much larger base, which makes these teeth much stronger and also allows the production of gears with fewer teeth. • Fig.4.22 illustrates three pressure angles as applied to a gear rack with all teeth being the same depth. • In actual practice, the 20° full depth involute system is widely used.
Theory of Machines: Unit II: Gears and Gear Trains : Tag: : Gears and Gear Trains - Theory of Machines - effect of pressure angle
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Theory of Machines
ME3491 4th semester Mechanical Dept | 2021 Regulation | 4th Semester Mechanical Dept 2021 Regulation