| 摘要 |
PROBLEM TO BE SOLVED: To implement smooth rolling of a roller and high linear motion accuracy, in a linear motion bearing applied for die set or the like. SOLUTION: Each roller 4 has a recess portion 41 of circular arc in section in the central portion, and is disposed along a circumferential direction and with respect to an axial direction of a guide bush (sleeve) 2 at a predetermined interval. Plural protruding portions 21 are formed on an inner circumferential face of the guide bush (sleeve) 2 to correspond to a position of each retainer 3 for arranging the roller. An outer shape of the protruding portions 21 is circular arc to be an approximately the same as a round shape of an outer peripheral face of a guide post (round shaft) 1. A contact area, that is brought into contact with the inside of the recess portion 41 of the roller 4, of the outer peripheral face of the guide post (round shaft) 1 is the same as a contact area, that is brought into contact with the outside of the recess portion of the roller, of the protruding portion 21 of the guide bush (sleeve) 2, so that the roller 4 rolls very smoothly.
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