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04000ME402052001

Design the gear drive and check the design for dynamic and wear loads.
Design a worm gear drive to transmit 20 HP from worm at 1440 rpm to the
worm wheel that should be rotated at 40 + 2%rpm.

PART C
Answer any two full questions, each carries 20 marks.
Design a V-belt drive to the following specifications. Power transmitted is

20 kW, speed of the driving wheel is 1440 rpm, speed of the driven wheel is
400 rpm, centre distance should not exceed 2500 mm, and the service of the
equipment is 16 hrs/day.

How will you designate V belt?

Design a chain drive to a compressor which receives power 15 HP from an
electric motor running at 970 rpm. The compressor speed is being 330 rpm.
The centre distance should be maximum 500 mm. The chain tension can be
adjusted by shifting the motor on slides.

What is the reason for selecting even number of pitches or links for roller
chain?

Design a connecting rod of a diesel engine for the following data.

Cylinder bore = 85 mm

Length of connecting rod = 350 mm

Maximum gas pressure = 3 MPa

Factor of safety against buckling failure = 5

(1/0) ratio for piston pin bearing = 1.5

(I/d) ratio for crank pin bearing = 1.25

Allowable bearing pressure for piston pin bearing = 13MPa
Allowable bearing pressure for crank pin bearing 11 MPa.
Length of stroke = 140 mm

Mass of reciprocating parts = 1.5 kg

Engine speed = 2000 rpm

Thickness of bearing bush = 3 mm

Material of cap = 40 C8 (5 + = 380 N/mm 2 )

Material of bolts=Alloy steel (ऽ + =450N/mm 2 )

Factor of safety for cap and bolts = 4 and 5 respectively

Density of connecting rod = 7800 kg/m 3.

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