Sprocket

Abstract

An annular plate, which is of a first material and has a toothed external periphery, is shrink fitted onto the perimeter of a disc of a second material so that there is no play between the annular plate and the disc. The perimeter of the disc includes at least one radially recessed region and the annular plate has its inner edge provided with corresponding one or more protruding regions which fit thereto. A plurality of fasteners, such as grub screws, are inserted axially at spaced intervals between the annular plate and the disc.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described further, by way of example, with reference to the accompanying drawing in which the single figure is a plan view of a preferred practical embodiment of the sprocket of the invention.

Claims

1. A sprocket comprising an annular plate, which is of a first material and has a toothed external periphery, shrink fitted onto the perimeter of a disc of a second material so that there is no play between the annular plate and the disc, the perimeter of the disc having at least one radially recessed region and the annular plate having its inner edge provided with corresponding one or more protruding regions which fit thereto, and a plurality of fasteners inserted axially at spaced intervals between the annular plate and the disc.

2. A sprocket as set forth in claim 1 wherein the fasteners are grub screws.