Helical Gear Problem


[ Follow Ups ] [ Post Followup ] [ Meshing with Gears Discussion Forum ] [ FAQ ]

Posted by Stuart on February 01, 2006 at 16:27:34:

Hi,

I often face a problem while calculating of some helical ratios. Specifications one of them are as under

Pinion Teeth = 22
Gear Teeth = 65
Normal Module = 7
Pressure Angle = 20
Helix Angle = 14.
Gear OD = 488mm,
Pinion OD = 178mm,
Centre Distance = 320mm.

I have a sample set of this ratio as well in my shop. All above dimensions are measured.

These dimensions do not match from that of my calculation. The outside diameter of pinion & gear is 172.714mm & 482.929mm respectively.

With reference to Centre Distance as 320mm , 7.139 module is the best one. But this module increase the gear OD and decrease the pinion OD .

It seems that helical gear can not be calculated with reference to their diameters like bevel gears. If it is so then which thing should I use as reference for calculation?

Is there any method to calculate helix angle & module with reference of centre distance?

Please reply

Thank you very much.

Stuart





Follow Ups:



Post a Followup

Name:
E-Mail:

Subject:

Comments:

Link URL:
Link Title:
Optional Image URL:


[ Follow Ups ] [ Post Followup ] [ Meshing with Gears Discussion Forum ] [ FAQ ]