It is known that in the case of a parallel sliding guide way, which structurally should not develop a macroscopic fluid wedge, the coefficient of friction reduces with an increase in the speed of sliding, similar to a journal bearing, and the state of lubrication shifts to the fluid lubrication region. Attempts have been made to explain the phenomenon from different points of view, but the present study has been performed with the purpose to clarify the effect of an oil groove provided on the parallel sliding guide way. Experimental results obtained by using a ring-shaped rotary sliding guide way show the strong effect of the presence of an oil groove on friction characteristics. The sliding guide way provided with oil groove clearly shows a lift in the region of high sliding speeds and a shift to the fluid lubrication state. In addition, interesting results are obtained when performing tests by changing the pitch of the oil groove and in tests performed by using lubricating oils with different viscosities.
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