Item 1692

MAKE: AeroVantage ~ Power Train - Planetary Reduction - Gear - Planet - 10 DP - 38 tooth

Drawing:

xx

Notes:

This gear is for DESIGN: AeroVantage ~ PropRotor - Hub - .1x2..- Layout w/ Swashplate

The thickness of the sprocket under the teeth is less than the tooth whole depth but the rim in the middle and the extended sides (to hold the bearings) should make up for this. If a needle bearing is used then there is plenty of metal under the teeth.

FORM: Gear - Spur - Dimensions

FORM: Hamilton Spur Gear Selection

Diametral Pitch:

10

 

 

No. of Teeth:

38

Pinion Speed:

3947 rpm

Pitch Diameter:

3.8"

Catalog Pinion Pitch Dia:

3.8"

Circular Pitch:

"

Pitch Line Velocity:

3928 ft/min

Tooth Form System:

20 & 25

Dynamic Factor:

0.444

Addendum:

"

Diametral Pitch:

10

Dendum:

"

Face Width:

1.0"

Clearance:

"

Allowable Contact Stress:

170000

Working Depth:

"

Allowable Bending Stress

36000

Whole Depth:

"

Elastic Coefficient:

Both steel

Outside Diameter:

"

Geometry Factor: [I]

0.09

Root Diameter:

"

Geometry Factor: [J]

0.38

 

 

Durability:

75.9 hp

 

 

Strength:

55.6 hp

Durability increase as a result of internal gearing (Hamilton p. D-4); 3:1 ratio is factor of 2.0; 4:1 ratio is a factor of 1.66. The actual ratio is 2.63 so the factor will be 2.5. 75.9 hp * 2.5 = 190 hp. Safety Factor - Durability = 3 * 190 = 570. 570 / hp [peak] = 5.70. This is between the planet and ring not planet and sun - I would think.

 

Safety Factor - Durability

3 planetary gears

= 3 * 75.9 = 227.7; 227.7 / 100 hp [peak]

= 2.28

 

Safety Factor - Strength

3 planetary gears

= 3 * 55.6 = 166.8; 166.8 / 100 hp [peak]

= 1.67

Thrust washers could position the assembly and handle incidental thrust. An example of a special bearing arrangement of this nature is shown in [Source - MDD] Fig.32.

Use of Helical Gears: (Consider using helical gears to reduce weight. - September 30, 2001)

If the above gear is produced as a helical gear then;

The durability changes approximately by an 80% increase.

The strength changes approximately by an 45% increase.

This means that; The weight can be reduced by the use of a narrower face width.

Parameters: (This is under development?)

 

 

 

 

 

 

 Normal Pressure Angle

 20

 

 

 

 

 

 

 

 

 

 

 

 

Source:

 

 Arrow Gear Company

C027

 High Aerospace quality

 

 Rush Gears Inc.

C047

 Prototype

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Last Revised: January 9, 2009