Rolling element retainer for linear guideway has extension projected in direction of rolling groove of loaded area retainer, and abuts against projection portion of end caps of rolling element retainer

摘要

An extension (51) is projected in the direction of the rolling groove (52) of a loaded area retainer (50), and abuts against the projection portion of the end caps of a rolling element retainer. The extension is located outside of the guiding portion (41) of the direction changing area retainer (40). The loaded area retainer is provided at both ends with the outward extension for mating with the direction changing is retainer. The length of the extension is expressed as A+Mnot less thanBnot less thanA=Lxwxdelta t+2p. The parameter A is the gap left between the direction changing area retainer and the loaded area retainer, M is the distance from the top and bottom of the direction changing area retainer, B is the length of the extension, L is the length of the loaded area retainer, w is the coefficient of thermal expansion, delta t is the range of operating temperature, and p is the manufacturing tolerance range.