Theory of Machines: Unit II: Gears and Gear Trains
Review and summary
Gears and Gear Trains - Theory of Machines
Review and summary: Gears and Gear Trains - Theory of Machines
REVIEW AND SUMMARY • A gear train is defined as a combination of gears that is used for transmitting motion from one shaft to another. • Train value is the ratio of the speed of the driven gear to the speed of the driving gear. • Types of gear trains are: 1. Simple gear trains, 2. Compound gear trains, 3. Reverted gear trains, and 4. Epicyclic gear trains. • When there is only one gear on each shaft, it is known as simple gear train. • Velocity ratio of a simple gear train: • Intermediate gears, also known as idler gears, are used to change the direction of rotation of the driven gear without changing its angular velocity. • Intermediate gears do not affect the velocity ratio/train value of the gear train. • When two gears are fixed on the same shaft, then the gears from a compound gear. • A gear train having one or more compound gears is known as compound gear train. • Velocity ratio of compound gear train: • A compound gear train in which the first and last gears are co-axial is called as reverted gear train. • When the axis of rotation of one or more gears is allowed to rotate about another axis, then the gear train is known as epicyclic gear train. • When there is only one gear on each shaft in any epicyclic gear trains, then gear trains are called as simple epicyclic gear trains. • When there are more than one gear on a shaft in any epicyclic gear trains, then they "are called as compound epicyclic gear trains. • The velocity for epicyclic gear train is found by using tabulation method or algebraic method. • Torques and tooth loads in epicyclic gear trains can be determined using the following relations: T1 + TO + TB = 0 Input power + Output power = 0 i.e., T1 ω1 + TO ωO = 0
Theory of Machines: Unit II: Gears and Gear Trains : Tag: : Gears and Gear Trains - Theory of Machines - Review and summary
Theory of Machines: Unit II: Gears and Gear Trains
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Theory of Machines
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