Question 5

a) Give three applications of epicyclic gearboxes and explain in each case why they are

appropriate design solutions?

(3 marks)

b) Figure Q5 overleaf shows a diagram for an epicyclic gear train, which is employed in a

gas turbine engine to transmit power from the engine to the aircraft's auxiliary

equipment. Power is supplied to wheel 3 and is delivered to a load attached to the

epicyclic arm, body 2. Wheel 5 is fixed to the gear case, body 1.

1)

1)

lv)

Determine T, ift=20,t₁ = 36 and t; = 60.

Show that

1-

I.T.

and evaluate az if = 1200 rad's.

(1 mark)

(6 marks)

Determine the fixing couple that must be applied to wheel 5 if the gear train

transmits 36 kW.

Z

(6 marks)

Find the tangential force at the pitch point between wheels 3 and 4 if the

module is 10 mm and there are three sets of compound planet wheels.

(4 marks)

NOT TO SCALE