Linear motion guide bearing

A linear motion guide bearing comprising:

• a rail made of a steel plate, having a pair of first rolling surfaces extending parallel to each other in a longitudinal direction;
• a slider having a pair of second rolling surfaces extending parallel to each other and opposing the pair of first rolling surfaces, respectively;
• and
• a plurality of rolling elements disposed to be able to roll on the first and second rolling surfaces;
• the slider having a pair of circulation passages formed therein, the circulation passages being spaces connecting one end and another end in each of a pair of load-carrying races, the load-carrying races being spaces between the pair of first rolling surfaces and the pair of second rolling surfaces,
• the plurality of rolling elements circulating in annular spaces configured from the load-carrying races and the circulation passages,
• in a cross section perpendicular to the longitudinal direction, the rail includes:
• a bottom wall portion,
• a first side wall portion rising from one end of the bottom wall portion,
• a second side wall portion rising from another end of the bottom wall portion and opposing the first side wall portion, and
• a top wall portion extending from an end of the first side wall portion opposite to the bottom wall portion to oppose the bottom wall portion,
• one of the first rolling surfaces being made up of wall surfaces of the second side wall portion and the bottom wall portion on an inner side of a first corner portion, the first corner portion being a region where the second side wall portion and the bottom wall portion are connected,
• the other of the first rolling surfaces being made up of wall surfaces of the first side wall portion and the top wall portion on an inner side of a second corner portion, the second corner portion being a region where the first side wall portion and the top wall portion are connected,
• wherein the slider includes
• a first component made of a bent steel plate, the first component having the pair of second rolling surfaces,
• a second component fixed to the first component in such a manner that a first circulation passage as a part of one of the pair of the circulation passages and a second circulation passage as a part of the other of the pair of the circulation passages are formed between the second component and a surface of the steel plate constituting the first component opposite to the surface on which the second rolling surfaces are formed,
• a third component made of resin, disposed at one end of the first component in the longitudinal direction of the rail, and fixed to the first component so as to form a first turnaround passage connecting one of the load-carrying races and the first circulation passage and a second turnaround passage connecting the other of the load-carrying races and the second circulation passage, and
• a fourth component made of resin, disposed at another end of the first component in the longitudinal direction of the rail, and fixed to the first component so as to form a third turnaround passage connecting the one load-carrying race and the first circulation passage and a fourth turnaround passage connecting the other load-carrying race and the second circulation passage.