2Litvin F L, Zhang Y, Wang J C, et al. Design and geometry of face-gear drives[ J]. Transactions of AfiME, Journal of Mechanical Design, 1992,114 (4) :642 - 647.
3Litvin F L. Handbook of Face Gear Drives with a Spur Involute Pinion[ R]. NASA CR-209909,2000 : 1 - 105.
4Litvin F L, Wang J C, Bossier R B, et al. Application of facegear drives in helicopter transmission [ J ]. Transactions of ASME, Journal of Mechanical Design, 1994,116 (3) :672 - 676.
5Litvin F L, Fuentes A, Handschuh R F, et al. Face-gear drives with spur involute pinion: geometry generation by a worm, stress analysis[J]. Coputer Methods in Applied Mechanics and Engineering, 2002,191 ( 25 ) :2785 - 2813.
6Lewicki D G, et al. RDS.21 Face-Gear Surface Durability Tests[R]. NASA/TM, 2007.
