A ball circulation system for linear guide way includes a slide rail, a
slider coupled with the slide rail, and two end covers of the slider with
an oil scraper. A cross-wise circulation passage and a separated
circulation passage respectively formed at two side of the end cover are
integrally combined in one structure so as to form two independent and
opposite ball circulations. By so space in the circulation system is able
to accommodate more rolling balls by twice filling procedure thereby
improving the efficiency of assembly work. Besides, up and down motion of
the rolling balls during circulation causes a uniform lubrication effect.
Allowing accommodation of more rolling balls means substantially
improving load carrying ability of the linear guide way.