Conical Springs - Ends

Many possible configurations for the ends of conical springs are available. The main idea is to design end coils so that they do not influence the behavior of the active coils while transmitting the axial load.

Active coils of conical springs

In conical springs, end coils can influence both axial lengths, inner diameter and outer (external) diameter:

  • L0 = La + (ni1 + ni2) d
  • Di = D1 - nj1 d
  • De = D2 + nj2 d

    • Next figure presents several possible configurations for closed and ground ends that can be used for non telescoping conical springs.

    closed and ground ends

    Case a: ni1 = 1 ; ni2 = 1 ; nj1 = 1 ; nj2 = 1

    Case b: ni1 = 0.9 ; ni2 = 0.9 ; nj1 = 1.1 ; nj2 = 1.1

    Case c: ni1 = 0.8 ; ni2 = 0.8 ; nj1 = 1.25 ; nj2 = 1.5

    Next figure presents several possible configurations for ends that enable conical springs to fully telescope.

    proposed ends for telescoping springs

    Case a: ni1 = 0.5 ; ni2 = 0.5 ; nj1 = 3.1 ; nj2 = 3.1

    Case b: ni1 = 0.5 ; ni2 = 0.5 ; nj1 = 3.1 ; nj2 = 3.1

    With such ends, it is possible to obtain a telescoping spring with Lc = d.


    Manuel Paredes