How does a Splined or Tangentially supported tire work?
The basic design concept is to reduce ovality (the amount of shell flexing) during rotation of the kiln. Shell flexing aka ovality is typically ¼ that of a migrating tire design. The primary motive for this is that it enhances the mechanical stability of the brick lining. At the same time there still is enough cold clearance between the shell and the tire to accommodate differential thermal expansion as there would be in the case of a migrating tire. Although this configuration allows unrestricted expansion of the kiln shell the tire is prevented from rotating on the shell.
The mechanics vary between the two designs but essentially each support the shell at 3 o’clock and 9 o’clock. This means the difference in tire to shell diameter would be an evenly split gap top and bottom. However gravity will make the gap larger at the top.
There is an obvious benefit to not having the tire migrate as anyone who has experienced the ongoing maintenance requirements of a creeping tire will attest.