HYDROSTATIC PRE-LOADING DEVICE FOR A SMALL SPINDLE, CAPABLE OF APPLYING THE SAME TO A SMALL MACHINING CENTER OR THE BUILT-IN SPINDLE OF A TAMPING MACHINE

摘要

PURPOSE: A hydrostatic pre-loading device for a small spindle is provided to fix a ball cage in order to prevent the ball cage from freely and axially moving, thereby reducing manufacturing cost through miniaturization and weight reduction.;CONSTITUTION: A hydrostatic pre-loading device (100) for a small spindle includes a housing (110), bearings (120a,120b), a first retainer (130), a second retainer (140), a spring for pre-loading, and a pipe (170). The housing houses the spindle (A). The bearings are inserted into the housing, and support the spindle. The bearing is placed between the retainers at the outer ring of the spindle. The spring elastically pre-loads the retainers. The pipe is connected between the retainers. The pipe transmits a pre-load on the first retainer to the bearing through the second retainer.;COPYRIGHT KIPO 2013