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

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Monday, March 14, 2011

AU2354 RING GEAR DESIGN INCLUDING THE DEVELOPMENT OF RING GEAR TEETH



AIM:

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


APPARATUS USED:

        Software: AUTOCAD 2000.
                         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

Outside
Diameter

Pitch
Diameter

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



               

                                                                                             

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