US Patent 7316418 Elastic coupling

An elastic coupling capable of sufficiently absorbing a shake of a steering shaft in its axis direction to prevent a driver from feeling uncomfortable due to the shake is provided. A rubber elastic body including lubricant is provided between an outer circumference of an inner casing having a roughly cross shape in section and an inner circumference of an outer casing while the outer casing and the rubber elastic body are enabled to slide in their axis direction so as to absorb a shake in the axis direction from a steering gear box side.