how to make a simple design shaft and spur gear by given dat

how to make a simple design shaft and spur gear by given data in the picture given and the specification given in the picture?

MEMB 333-Machine Design Semester 1-2016/20171 Project Title: A portableair compressor Background A single cylinder, two stroke engine.is coupled through a clutch to agear set-to-reduce the engine speed and boost its torque appropriately The 2.5hp gasoline.line engine.is governed.at-3800rpm Figure 1-shows the engine-mounted.on a base with its output-shaft.connected via a.clutch to the input shaftofa gearbox.The gearboxcontains a-single gear-setto-reduce the high-enginespeedto-a lower one for the compressor. The required gear ration is-1500:3800 or 0.39:1. The output-shaft fromthe gearbox-is-connected-via a-coupling.to-the-crankshaft-of the-compressor.The shaft-in gear box-housing are-carried-in-suitable bearings. agine liug og ICw CRSIE croS sCtion schematic lith gine Css sectio bave front view

Solution

Answer : To design a shaft and spur gear

The major working of the shaft is to transmit the power from one shaft to the other shaft by the spur gear application, in order to reduce the engine size it is coupled to the clutch ,

From the given data,

speed of gasoline engine is 3800 rpm,

Gear ratio : 1500:3800

From picture,

On the shaft axis there is a flywheel, coupled with engine on the same axis, from that and let us assume a 15 inch spur gear of which is larger diameter than that of the other spur gear of 7inch,

To drive the power from one gear to other gear they are coupled directly on that axis as shown in figure,

(I)overall features of the gear box:

The gear box consists of the set of the spur gears the one with larger diameter and the speed is increased by decrease in the diameter

For suchcondition the gear diameter ration is in 1:2 for the engine speed specification, as mentioned above

They are arranged in a planetary gear mesh box manner so as for the better power transmission and high rate of efficiency to reduce the size of entire gearbox equipment,

(II) the design procedure for the spur gear ,

For the given specification of the portable air compressor

There is a need of high rate of corrosion resistant cast steel alloy To rest tthe three spur gears in the order where

G1<G2>G3

Fatigue life for that application has the highest possibility,So as to reduce the fatigue of the setup and increase its llife continuous lubrications is to given,

For the operation of the 10 yrs continuously ,

Fromthe assistance of machine design data book for this type of application air compressor the material SAE74 is suitable for this optimal working for 10 years

The weakest link which might be the third part on the shaft axis ,

Where the maximum bearing pressure acts on to nullify that, the weakest link is setup,

Most probably factor yield and factor of safety for this type of application is restricted to ( 2-2.25)

The maximum torque is carried out to the output shaft from the input shaft ,

The speed of the engine running and the size of the gear in the ratio 1:2

For the required optimality

These are required outcomes from the above figure discussed.