Method of fastening drive elements of a hollow shaft

Abstract

Method fastening drive elements on a hollow shaft, which comprises: pushing n drive elements with a thickness a over a hollow shaft, retaining the drive elements at mutual spacings b and in respective desired azimuthal positions by means of holding devices; providing active sections of a material with a given limit of elasticity, a length c, mutual spacings d and being bounded by sealing lips on a hydraulic expanding device so that .[.n (a+b)=n (c+d).]. .Iadd.n.a+(n-1) b=n.c+(n-1) d.Iaddend., pushing the hydraulic expanding device into the hollow shaft; and applying a pressure through the hollow shaft to the active sections stressing the material of the active sections radially beyond the given limit of elasticity.

We claim: 
     
       1. Method of fastening drive elements on a hollow shaft, which comprises: pushing .[.n.]. drive elements with a thickness .[.a.]. over a hollow shaft of a material with a given limit of elasticity, retaining the drive elements at mutual spacings .[.b.]. and in respective desired azimuthal positions by means of holding devices; providing .Iadd.a hydraulic expanding device having .Iaddend.active sections with a length .[.c.]., mutual spacings .[.d.]. and .[.being bounded by.]. sealing lips .[.on a hydraulic expanding device so that n(a+b)=n(c+d).]. .Iadd.bounding the active sections.Iaddend., pushing the hydraulic expanding device into the hollow shaft;   applying a pressure through the hydraulic expanding device to the active sections stressing the material of portions of the hollow shaft opposite the active sections radially beyond the given limit of elasticity and into secured engagement with the drive elements;   reducing the pressure at the active sections; and withdrawing the hydraulic expanding device from the expanded hollow shaft.   
     
     
       2. Method according to claim .[.1.]. .Iadd.4.Iaddend., which comprises making a=c. .[.3. Method according to claim 1, which comprises making b=d.].. .Iadd.4. Method according to claim 1, which comprises making n.a+(n-1)b=n.c+(n-1)d, wherein n is the number of drive elements, a is the thickness of the drive elements, b is the spacing between the drive elements, c is the length of the active sections, and d is the spacing between the active sections.Iaddend..