Profile tool

Abstract

The profile tool for the cutting of work pieces in the form of spiral and hypoid bevel gears, especially for motor vehicles, has several sections in the form of circles or straight edges. On some of the sections, a profile is optionally radially overlaid which is a nth order polynomial.

1 . Profile tool for cutting work pieces in the form of spiral and hypoid bevel gears, especially for transmissions of motor vehicles, wherein the profile of the tool contacting the work piece has a first section ( 1 ) in the form of a straight edge on the tool front face, a second section ( 2 ) in the form of a corner radius for generating a fillet section, a third section ( 3 ) in the form of a straight edge or of a circular segment for generating a root relief, a fourth section ( 4 ) in the form of a straight edge or of a circular segment for generating the primary flank and a fifth section ( 5 ) for generating a tip relief, characterized in that for generating the fillet section, for generating the primary flank and for generating the tip relief, on the profile sections ( 3 ,  4 ,  5 ) is optionally radially overlaid a profile which is a nth order polynomial.  
     
     
         2 . Profile tool according to  claim 1 , characterized in that the origin of coordinates of the nth order polynomial can be freely selected.  
     
     
         3 . Profile tool according to  claim 1 , characterized in that the origin of coordinates of the nth order polynomial is on the transition point between two adjoining sections.  
     
     
         4 . Profile tool according to any one of the preceding claims, characterized in that the nth order polynomial has the following form: 
       Δ —   rp=K   2 *Δ —   xp   2   +K   3 *Δ —   xp   3   +. . . K   i *Δ —   xp   i   +. . . +K   n *Δ —   xp   n   
       wherein the ki coefficients are real numbers and the exponents are integral.  
     
     
         5 . Profile tool according to any one of the preceding claims, characterized in that the nth order polynomial has the following form: 
       Δ —   rp=Σ ( K   1 *Δ —   xp   xi ) 
       wherein the Ki coefficients are real number and the exponents xi are not integral.