Profile

Recirculating ball screws manifest complex interactions between the balls and the nut rolling track and between the balls and the screw rolling track.

Following in-depth experimentation, B.B. has individuated a particular rolling track profile, the so-called "gothic arc", which guarantees great advantages in terms of the hertzian pressure occurring between ball and screw tracks as well as in terms of axial load capacity.

This profile is made up of two symmetrical arches having a bend radius which is larger than that of the balls themselves.

These arches meet on the axis of symmetry, forming a point; the two arches are related to the ball radius in such a way as to produce an optimum contact angle.

This solution definitively prevents any ball slippage or wedging.

 ___ h_{d  rendimento diretto}

 _{- - -}   h_{i   rendimento indiretto}

___ h_{d  direct efficiency}

 _{- - -}   h_{i   indirect efficiency}