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GEAR

Presented By:Satheesh Kumar and Srinivas Approvedb :

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POWER TRANSMISSIONBelt Drives

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 Types of Bevel gears:

StraightBevel Gear

SpiralBevel Gear

erolBevel Gear

!ypoidBevel Gear

"iterBevel Gear

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Design Pro#ed$re:

Preli%inary design

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E$ro#opter E& ''!eli#opter:

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Te#hni#al Spe#i(#ations:

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•

Esti%ated Load) P : *++, -.

• Speed of the pinion) np  : /0*0 rp%

1ref 2

•  Tor3$e) : 4//567*+ 89% 1ref 

2

• Gear Ratio) mG  : '67/ 1 n p ; ng <

/0*0;'/7 2 So$r#e: E$ro#opter E&'' Te#hni#al Data

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Ass$%ptions:

• Shaft Angle : 07o other

• Press$re Angle : '7o other =ref >

•

Spiral Angle : 4o

other =ref >• "aterial : &ase hardened Steel

other

•

!and of Spiral : Left hand other =ref >

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• Step 1: Estimated Pinion Sie:

 –  Pinion pit#h dia%eter) d 9 pittingresistan#e =fro% (g *>

 – Pinion pit#h dia%eter) d 9 bendingstrength =fro% (g '>

?ig$re *

?ig$re 'd <

*,6*%

%

d !"#$."

mm8@TE : Pinion Tor3$e < 4//567*+8% Gear ratio < '67/:*So$r#e:

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• Step ': 8$%ber of Teeth in Pinion) n 

< '' =fro% (g 4>

8@TE : Pinion Pit#h Dia%eter < '746'%% Gear ratio < '67/:*

?ig$re 4

So$r#e:

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• ?a#e .idth) F  < ,5 %% =fro% (g />

8@TE : Pinion Pit#h Dia%eter < '746'%% Gear ratio < '67/:*

?ig$re /

So$r#e:

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• Dia%etral pit#h :

% % t

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%ear %eometr&

ItemS&m

Pinionunits

S&m

'othPinion

and%ear

unitsS&m

%earunits

Pit#h Dia%eter d *4 %%

 

D /0 %%Pit#h angle C

*0647,/0/,

deg +76,04

7/deg

@$ter #onedistan#e

Ao

''067,+'

%%

 

"ean #onedistan#e

A%

*0/67,+'

%%

Depth fa#tor * ' 9"ean .oring

Depthh

*'6/0,*7'5

%%

&learan#e fa#tor ' 76*' 9

&learan#e #*6,'7*

5+5%%

"ean .holeDepth h%

*/675*,07+ %%

E3$ivalent 07Fratio

%07

'60',44'/

deg

"eanaddend$%

fa#tor

#* 76'// 9

"ean #ir#$larpit#h p% '46074''5+ %%

Ass$%ptions

=ref>

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Assumptions

S&mS&m

(a)ue

units

*omments

Pinion teeth n *+ 9Gear teeth 8 * 9

%od$le %et 0 %%

Shaft angle 07 deg

?a#e idth ? +7 %%Spiral angle 4 deg

Depth fa#tor * ' 9See

table /&learan#e

fa#tor' 76*' 9 See +6

Addend$%fa#tor #* 76'// 9 Seetable S$% of

dedend$%angles

H '6*,4See

table ,

pinion

dedend$%angle HP 76075

See

table +

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Referen#e i%ages:

General no%en#lat$reGear angles&atia eJa%ple

Aero appli#ation8or%al plane

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 T!A8- M@N

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Points raised in the previo$s

%eeting

• Poer Trans%ission fro% the tinshafts