Patent ID: 7401978
Filing Date: 2008-07-22
Classification: F16C

Abstract:
1. 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.