in a gear meshing which undergoes sliding rolling sliding whether we experience surface contact or point contact.
Dear Mr. Shubrajit Bhaumik!
Point contact or line contact is before the application of the load. Conventionally, elliptical or rectangular contact area is, after application of the load. Area kind corresponds the of engagement type.
Best regards
In this case there will be either point or line contact not surface contact.
Dear Shubrajit Bhaumik, you are right, in the loading gears we observe surface contact and without load - point or linear (for cylindrical gears) type of contact. The detailed classification of forms and location of tooth contact pattern (16 schemes on p. 86-87) you can find in Dictionary-Reference Book on Gearing (Russian-English-German-French). - Saint Petersburg, 2004 and next Editions (2005 (available on RG), 2007, 2008, 2011). Best regards, Serge
Generally you can calculate the approximated area of contact with the Hertz theory. For a precise definition of the contact area, you should introduce the EHL theory that considers both the deformation of the solids and the supporting effects of the lubricants.
Franco
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