Patent ID: 7762723
Filing Date: 2010-07-27
Classification: F16C

Abstract:
1. A linear motion guide unit, comprising: a guide rail having first lengthwise raceway grooves thereon, a slider allowed to move in sliding manner relatively to the guide rail, the slider comprising: wherein the return passages are made in a geometric relation lying obliquely upwards of the load-carrying races while the return passages are apart from their associated load-carrying races by a distance less or equal to twice a diameter of the rolling elements; wherein the end caps are made integrally thereon with spigots, each of which is raised above the associated end cap towards the carriage to connect with the associated return passage to form any one end of the return passage, while the end caps are made therein with a lubricating port and lubricant paths extending from the lubricating port to the spigots; wherein the end caps are each made up of an end cap major part and a spacer part to fit into the end cap major part, and the end cap major part is made at widthwise opposite ends thereof with outside curved grooves to provide the turnaround passages, while the spacer part is made at widthwise opposite ends thereof with inside curved grooves to provide the turnaround passages; wherein the end cap major part includes first turnaround passage halves having therein the outside curved grooves to provide the turnaround passages, first spigot halves communicating with the first turnaround passage halves to provide the spigots that constitute partly the return passages, and a top portion joining the first turnaround passage halves together and also joining the first spigot halves together with one another; wherein the spacer part includes therein second turnaround passage halves having therein the inside curved grooves to provide the turnaround passages in combination with the first turnaround passage halves, second spigot halves communicating with the second turnaround passage halves to provide the spigots in combination with the first spigot halves, which constitute partly the return passages, and a bridge portion joining the second turnaround passage halves together and also joining the second spigot halves together with one another, and wherein the first spigot halves of the end cap major part join with the second spigot halves of the spacer part to complete the spigots and wherein the second spigot halves of the spacer part are each made to account for more in circular direction than a semicircle to provide any room for the lubricant paths.