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Describe and explain the type of aircraft using :-

a) Spur and Pinion Gear

This aircraft are using the spur and pinion gear.

Spur gears are the most common type of gears. They have

straight teeth, and are mounted on parallel shafts.

Sometimes, many spur gears are used at once to create very

large gear reductions.

Two meshing gears transmitting rotational motion. Note that

the smaller gear is rotating faster. Although the larger gear

is rotating less quickly, its torque is proportionally greater.



One subtlety of this particular arrangement is that the linear

speed at the rim is the same on both gears.

b) Spur Planetary

This Cessna 152 are using the planetary gear system.

In a planetary reduction gear system the propeller shaft is

attached to a housing that contains several small gears

called planetary gear. The lanetary gear rotate between a

sun gear and a ring gear. The crankshaft drives either the

sun or ring gear depending on the individual installation.

Epicyclic gearing or planetary gear is used here for

increasing output speed. The planet gear carrier (green) is



driven by an input torque. The sun gear, in the center, but

almost hidden, has a prominent yellow shaft which provides

the output torque, while the ring gear (pink) is fixed. Note

the red marks both before and after the green input drive is

rotated 45° clockwise.c) Bevel Gear

This Fairey Rotodyne prototype are using the bevel gear.

Bevel gears are gears where the axes of the two shafts intersect and

the tooth-bearing faces of the gears themselves are conically shaped.

Bevel gears are most often mounted on shafts that are 90 degrees

apart, but can be designed to work at other angles as well.

The pitch surface of bevel gears is a cone.

http://en.wikipedia.org/wiki/Gears

http://en.wikipedia.org/wiki/Cone_(geometry)

http://en.wikipedia.org/wiki/Cone_(geometry)

http://en.wikipedia.org/wiki/Gears



The most familiar kinds of bevel gears have pitch angles of less than90 degrees and therefore are cone-shaped. This type of bevel gear iscalled external because the gear teeth point outward. The pitchsurfaces of meshed external bevel gears are coaxial with the gearshafts; the apexes of the two surfaces are at the point of intersection

of the shaft axes. Bevel gears that have pitch angles of greater thanninety degrees have teeth that point inward and are called internalbevel gears.

Explain the type of aircraft using :-

a) Tapered Shaft

This Cessna 206 is the low powered engine aircraft that use the

tapered shaft.

Tapered propeller shaft were used on most of the early

and low powered engines. On a tapered propeller shaft, the

shaft diameter tapers toward the end of the shaft. To

prevent the propeller hub from rotating on a tapered shaft,

one or more key slots are milled into the shaft. In addition,

the end of the shaft is threaded to receive a propeller

retaining nut.



A tapered propeller shaft changes in diameter along its

length and uses a metal key to keep a propeller from

rotating.

b) Splined propeller shaft.

This B-50 is the high powered radial engine that use the splined

shaft.

Most high powered radial engines aircraft are use splinedpropeller shafts. A spline is a rectangular groove that is

machined into the propeller shaft. Most splined shafts

have a master spline that is approximately twice the size

of any other spline. This master spline assures that a



propeller is attached to a propeller shaft a specific way so

that the vibration is kept to the minimum.

All splined propeller shafts are identified by an SAE

number. For example, SAE 50 identifies a splined shafts

that meets SAE design specifications for a 50 size shaft.

The SAE numbr does not refer to the number of splines.

c) Flanged Propeller Shaft

This H23 Agusta A-109HO is opposed aircraft engines that use flanged propeller shaft.

The flanged propeller shaft mostly use in opposed

aircraft engines. The crankshaft is forged with a flat flange

on its end. A propeller is bolted directly to the flange. To

provide additional support for the propeller, most flange



propeller shafts incorporate a short shaft forward of the

flange and a series of studs around the flange

circumference.

Before you remove a propeller from a flanged shaft,

temporarily mark the propeller hub and flange. This

makes it easier to position the propeller when you retach

it.



UNIVERSITI KUALA LUMPUR

MALAYSIAN INSTITUTE OF AVIATION

TECHNOLOGY

ASSIGNMENT 2

REDUCTION GEAR AND PROPELLER SHAFT

NAME : MUHAMMAD AFZAL BIN MOHAMAD AMIN

ID NUMBER : 53135111085

CLASS : 3AVT

LECTURER : SIR ABDUL GHANI



SUBJECT : RECIPROCATING ENGINE 1





UNIVERSITI KUALA LUMPUR

MALAYSIAN INSTITUTE OF AVIATION

TECHNOLOGY

ASSIGNMENT 2



REDUCTION GEAR AND PROPELLER SHAFT

NAME : ZULHILMI HAZIQ BIN NOR MOHAMED ZIN

ID NUMBER : 53135111222

CLASS : 3AVT

LECTURER : SIR ABDUL GHANI

SUBJECT : RECIPROCATING ENGINE 1

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