Gears and Gear Trains - Theory of Machines
Subject and UNIT: Theory of Machines: Unit II: Gears and Gear Trains
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.
Gears and Gear Trains - Theory of Machines
Subject and UNIT: Theory of Machines: Unit II: Gears and Gear Trains
The compound gear trains Can be subdivided into two types:
Gears and Gear Trains - Theory of Machines
Subject and UNIT: Theory of Machines: Unit II: Gears and Gear Trains
When two gears are fixed on the same shaft, then the gears form a compound gear.
Gears and Gear Trains - Theory of Machines
Subject and UNIT: Theory of Machines: Unit II: Gears and Gear Trains
When there is only one gear on each shaft, it is known as simple gear train.
Gears and Gear Trains - Theory of Machines
Subject and UNIT: Theory of Machines: Unit II: Gears and Gear Trains
The gear trains can be classified as shown in Fig.5.1.
Gears and Gear Trains - Theory of Machines
Subject and UNIT: Theory of Machines: Unit II: Gears and Gear Trains
A gear train is defined as a combination of gears that is used for transmitting motion from one shaft to another.
Gears and Gear Trains - Theory of Machines
Subject and UNIT: Theory of Machines: Unit II: Gears and Gear Trains
problems for practice: Gears and Gear Trains - Theory of Machines
Gears and Gear Trains - Theory of Machines
Subject and UNIT: Theory of Machines: Unit II: Gears and Gear Trains
Review Questions: Gears and Gear Trains - Theory of Machines
Gears and Gear Trains - Theory of Machines
Subject and UNIT: Theory of Machines: Unit II: Gears and Gear Trains
Gears are toothed wheels used for transmitting motion and power from one shaft to another when they are not too far apart and when a constant velocity ratio is desired.
Gears and Gear Trains - Theory of Machines
Subject and UNIT: Theory of Machines: Unit II: Gears and Gear Trains
The gear teeth obtained by modifying the standard proportions of gear teeth parameters is known as non-standard gear teeth.
Gears and Gear Trains - Theory of Machines
Subject and UNIT: Theory of Machines: Unit II: Gears and Gear Trains
Now let us derive the relation for minimum number of teeth required on pinion to avoid interference with gear.
Phenomenon of Interference, Concept of Undercutting, Condition to Avoid Interference, Methods to Avoid Interference
Subject and UNIT: Theory of Machines: Unit II: Gears and Gear Trains
As we discussed in Section 4.8, the constant angular velocity ratio for a pair of gears can be maintained only when the mating tooth profiles are conjugate (or involute) with respect to one another.