KEY CONNECTION Russian patent published in 2012 - IPC F16B3/00 

FIELD: machine building.

SUBSTANCE: key connection includes the connected parts of the items, which consist of external and internal stiffening rings into the annular cavity between which there installed through an opening in external stiffening ring are keys, and the opening is closed with a retention pin fixed on external stiffening ring. On side surfaces of the key there made are projections with support surfaces in radial direction, which are in contact with mating surfaces of stiffening rings; one of them contacts the surface of external stiffening ring, and the other one contacts the surface of the internal one, and retention pin has inner radial projection the height of which equals to thickness of external stiffening ring.

EFFECT: uniform contact stresses between connected elements and key, which almost eliminates the appearance of crushed sections of the parts.

3 dwg