Dorofeev

Gearings with contact ratio big 2 have some advantages in comparison with standard straight-toothed transfers: high flexural and contact strength, low vibrations and small dynamic loads. At their projection there are some problems - jam origination, high contact loadings on crimps of teeths, heightened speeds of a slip, a heightened heat release. For elimination of these problems it is offered to use modification of a line of a structure of teeths. The article presents results of comparison of various kinds of the profile modification applied to steams of aviation toothed wheels: with contact ratio big 2, and also with contact ratio equal 1.5. Comparison was conducted for the gears applied in aircraft.

The design technique on the set width of a cog at an apex combines advantages of geometry of a design technique in combined parametres with obviousness of projection on OST 1 00258-77 «Transfers gear cylindrical involute straight-toothed an external gearing. Calculation of geometrical parametres».Design technique selection determines area of existence of the gearing. As a result of it the point which is in area of existence, at projection, for example on OST 1 00258-77, can be out of area of existence for the gearing designed on set width of a cog at an apex. Thus, there was a necessity for mining of a method of construction of blocking head loops for a new design technique.In the article the method of construction of blocking head loops for the aviation gearings designed on set width of a cog at an apex is presented. The method is grounded on use of nonlinear programming.