AU2354 RING GEAR DESIGN INCLUDING THE DEVELOPMENT OF RING GEAR TEETH - Computer Programming

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## Monday, March 14, 2011

AIM:

To determine the design of ring gear including the development of ring gear teeth .

APPARATUS USED:

Hardware: 128 MB RAM, Keyboard, and Mouse.

PROCEDURE:

Ring gear design as per the standard starter pinion, specification available in SAE handbook.

Depth of ring gear excluding teeth can be taken between 12 to 16 mm
Width of ring gear can be taken between 16 to 18 mm,
Involute tooth profile is used for developing the tooth

STANDARD PINION DETAILS

 Use duty Dp No. Of teeth Root dia (inches) Outside dia (inches) Pressure angle (s) Standard pinion blank Pitch dia (inches) Light 10/12 9 0.787 1.167 200 10 1 Light 8/10 10 1.125 1.575 200 11 1.875

Gear ratio between standard pinion and ring gear lies between 9:1 to 11:1
Take the necessary values from the tabular column of standard pinion details

The addendum and dedendum values of starter pinion are same as that of addendum and dedendum values of ring gear.

Data for starter pinion:
All Dimension Are In Inches

 S.no Diameteral pitch No of teeth in pinion Root Diameter OutsideDiameter PitchDiameter Pressure Angle 1 2 3 4

Dg             = Pitch circle diameter of ring gear
Dg              = D7 + 2 (4) + 2 (dedendum)
Dedendum = Pcd - Root dia / 2
Diameteral pitch  = I / D

From this calculate the number of the teeth on ring gear

The gear ratio is between 9 to 11
Ratio of ring gear to pinion = Ring gear teeth / Pinion teeth

DESIGN OF TOOTH PROFILE:

Basic circle diameter = 2 x (Pcd x cos θ) / 2

Where,
θ = pressure angle
Pcd = pitch circle diameter of ring gear = d8

TOOTH ANGLE:

Tooth angle = 360 / 2n

Thickness of teeth = p x Pcd / 2n

CALCULATION:

Pitch circle diameter of ring gear

D8 = D7 + 2(4) + 2 (dedendum)

D8 = D7 + 8 + 2     (dedendum)

Dedendum = Pcd – Root dia / 2
=

D8   = D7 + 8 + 2 (dedendum)
=

Diameteral pitch   = I / D

T = 91.411 Ω 92 teeth

No of teeth in ring gear = 91.411 Ω 92 teeth.

The ratio of ring gear to pinion = Ring gear teeth / Pinion teeth

DESIGN OF TEETH PROFILE:

Base circle diameter  = 2 x (Pcd x cos θ / 2)   (θ = pr angle = 20)
=

Tooth angle θ    = 360 / 2n

=

Thickness of teeth   = p x Pcd / 2n

=

RESULT:

Thus the cam profile is designed & drawn using AUTO CAD 2000