Bearings – Linear bearing – Recirculating
Patent
1988-04-05
1989-01-24
Levy, Stuart S.
Bearings
Linear bearing
Recirculating
384 45, F16C 3106
Patent
active
047998040
ABSTRACT:
A four track-type endless rectilinear motion guide unit is provided wherein a slide unit is mounted on a track rail member with a plurality of parallel-arranged cylindrical rollers being intervened therebetween for endless circulation. The four endless circulation passages for rollers, viz., a pair of lower and upper passages on each of the opposing sidewalls of the track rail member are arranged such that, as seen in a cross section of the slide unit, their longitudinal axes cross each other at right angles, while the two endless circulation passages differ from each other in size providing a longer endless circulation passage having a larger cross section and a shorter endless circulation passage having a smaller cross section, which are arranged such that the longer circulation passage encompasses the shorter circulation passages within the loop, but the lengths of the load-carrying trackway surfaces of said two circulation passages are the same.
Thus is provided a four track-type endless rectilinear motion guide unit wherein the construction of the slide unit is particularly made simple and compact, consisting of the least possible number of parts thus eliminating any assembly error, while the load capacities of the upper and lower trackways are made desirably adjusted, yet minimizing the longitudinal length, as a whole, of the endless circulation passage to be formed in the slide unit.
REFERENCES:
patent: 3008774 (1961-11-01), Morris et al.
patent: 4563045 (1986-01-01), Katayama
patent: 4743124 (1988-05-01), Blaurock
Hannon Thomas R.
Levy Stuart S.
Nippon Thompson Co. Ltd.
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