Linear motion guide unit
AssigneeNippon Thompson Co., Ltd.
InventorsAyana Takemura, Shigemasa Itabashi
Life of this patent
Estimating the term…
Abstract
A linear motion guide unit has sleeves which form return passages and are formed of a high temperature resistant resin material which allows use in a high temperature environment. In the linear motion guide unit, spaces serving as grease pools are formed in the sleeves inserted into insertion holes of a carriage. The sleeves are formed of a thermoplastic resin whose heat distortion temperature is higher than 80° C. Each sleeve is formed by combining split circular members obtained by dividing a cylindrical member into two pieces along the longitudinal direction, and a plurality of grooves which become spaces are formed on the inner circumferential surfaces of the sprit circular members through cutting orthogonal to a parting plane between the split circular members.
Claims5
A linear motion guide unit comprising:
- an elongated guide rail having a first raceway groove formed along each of opposite sides extending in a longitudinal direction;
- and a slider which slides on the guide rail in the longitudinal direction,
- wherein the slider comprises:
- a carriage which has a second raceway groove extending to face the first raceway groove of the guide rail and an insertion hole extending along the second raceway groove;
- a sleeve which is inserted into the insertion hole so as to form a return passage;
- a pair of end caps which are attached to opposite end surfaces of the carriage and each of which has a turnaround passage communicating with the return passage and a load-carrying race formed between the first raceway groove and the second raceway groove;
- and
- a plurality of rolling elements which roll through a circulation passage formed by the load-carrying race, the return passage, and the paired turnaround passages, and
- wherein the sleeve is not porous and formed of a thermoplastic resin selected from a group consisting of polyimide resin, polyamide-imide resin, ABS resin, polyethylene terephthalate (PET) resin, polyamide resin, polyacetal resin, polytetrafluoroethlylene (PTFE) resin, polyphenylenesulfide resin, and polyether ether ketone (PEEK) resin, and has a space serving as a grease pool.
Dependencies are inferred from the claim text.