Gears Trains

Gears Trains

Need of Gear Train

Types of Gear Train

Simple Gear Train

Compound Gear Train

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Reverted Gear Train

When the axes of the first gear (i.e. first driver)and the last gear (i.e. last driven or follower) are co-axial,then the gear train is known as reverted gear train

Reverted Gear Train

Reverted Gear Train

Reverted Gear Train

Epicyclic Gear Train

Epicyclic Gear Train

Epicyclic Gear Train

Compound Epicyclic Gear Train—Sun and Planet Gear

(a) 20 rpm

(b) 27𝟑

𝟏𝟏rpm

(c) 19𝟕

𝟏𝟏rpm

(d) 100 rpm

A single epicyclic gear train is shown in the given figure. Wheel A isstationary. If the number of teeth on A and B are 120 and 45 respectively,then when B rotates about its own axis at 100 rpm, the speed of C would be

(a) 12

(b) 15

(c) 18

(d) 24

In the epicyclic gear train shown in the given figure, A is fixed. A has 100teeth and B has 20 teeth. If the arm C makes three revolutions, the numberof revolutions made by B will be

(A) 0 rpm (B) 20 rpm

(C) 33.33 rpm (D)66.67 rpm

The sun gear in the figure is driven clockwise at 100 rpm. The ring gear is heldstationary. the number of teeth on sun gear is 20, on planet gear is 30 and onring gear is 80 shown on the gears, the arm rotates at

Arm

Planet 30T

(a) 10 rpm ccw

(b) 10 rpm cw

(c) 12 rpm ccw

(d) 12 rpm cw

An epicyclic gear train is shown schematically in the adjacent figure. The sungear 2 on the input shaft is a 20 teeth external gear. The planet gear 3 is a 40teeth external gear. The ring gear 5 is a 100 teeth internal gear. The ring gear5 is fixed and the gear 2 is rotating at 60 rpm (ccw = counter-clockwise andcw = clockwise). The arm 4 attached to the output shaft will rotate at

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