US Patent 7771119 Linear guide apparatus

Inclined portions 15 which are provided at both end portions of a slider-side rolling element raceway groove 11 are each made up of a first crowning 18 which is formed into a curved surface shape with a large radius of curvature so as to be inclined moderately and continuously from the slider-side rolling element raceway groove, a planar second crowning 19 which neighbors the first crowning and extends towards an inner circumferential surface of a direction turning path and which is steeper in inclination than the first crowning and shorter in axial length than the first crowning, and a slope 20 which is provided between the second crowning and an end face of a slider main body and is formed steeper than the first and second crownings.