Linear motion guiding apparatus

A linear motion guiding apparatus including:

• a guide rail in which a rail side rolling element raceway groove is provided to the lateral surface along an axial direction,
• a slider main body having a slider side rolling element raceway groove opposed to the railway side rolling element raceway groove and supported on the guide rail so as to be movable axially by way of a plurality of rolling elements arranged in a rolling element rolling channel formed between the rail side rolling element raceway groove and the slider side rolling element raceway groove,
• a rolling element return channel provided in the slider main body so as to be substantially parallel with the rolling element rolling channel,
• an end cap attached to both ends of the slider main body in the moving direction and forming a semicircular outer circumferential circulation groove of a rolling element circulation channel for communicating the end of the rolling element return channel and the end of the rolling element rolling channel,
• a return guide interposed between the end cap and the slider main body and forming an inner circumferential circulation groove of the rolling element circulation channel at a position opposed to the outer circumferential circulation groove, and
• a crowning disposed on both ends of the slider rolling element raceway groove, wherein the crowning amount is defined as 0.3% to 1.5% of the diameter of a rolling element that rolls along the rolling element rolling channel.