·The axes of the pinion and gear intersect or cross under a certain distance hypoid offset The blade profile of the shaper cutter is equal to the corresponding pinion profile where backlash and root clearance have been considered in the design of the tool The tool is a custom design but it is calculated and manufactured like a regular
·above the root diameter of the pinion The top region of the meshing gear has a perfect involute which however can not find an involute surface in the pinion root for a correct meshing The undercut solves this problem partially by avoid ing a metal to metal interference Such an interference induces vibration and
·Tip and Root Clearance Calculation Examples The following are calculations for Center distance a and Tip and root clearance c when Module m = 2 Pinion z1 = 20 Gear z2 = 40 Reference diameter of Pinion d1 = 20 × 2 = 40 Reference diameter of Gear d2 = 40 × 2 = 80 Center distance a = 40 80 / 2 = 60 c = × 2 = Calculation Examples
·Tip to Root Clearance inch Pinion Tip to Gear Root / Gear Tip to Pinion Root 2 17FTM13 ISO 6336 2006 Rating version Data Set 1 Page 2 FTM Paper Gear Set 1 2017/07/27 13 54 24 151 29 5 mn a 20 18 helix American Gear Manufacturers Association Nitrided Gear Rating Suite GUI Version
·2 root apex to crossing point mm DOMR 2= m f2 face module mm HGER whole depth of teeth mm Table 2 Numerical pinion blank specifications Pinion Blank Data Variable Explanation Value Dimension z 1 number of teeth pinion 13 RINR 1 inner cone distance along root line mm RAUR outer cone distance along root line mm
·ROOT CLEARANCE —The designed root clearance with gear and pinion operating on their designed centers can be obtained from the manufacturer s drawing or blueprint The actual clearance can be found by taking leads or by inserting a long feeler gage or a wedge gage This clearance should check with the designed clearances
The Gleason Company defines the tooth profile as tooth depth h = ; tip and root clearance c = ; and working depth hw = The characteristics are Design specified profile shifted gears In the Gleason system the pinion is positive shifted and the gear is negative shifted
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