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A ball screw brake and stop assembly having an elastomeric compression pad or elastomer member circumferentially surrounding the ball screw and received in a counter bore of a non-rotating assembly having a bore receiving the ball screw with the pad confined on its outer diameter and at one axial en

A ball screw brake and stop assembly having an elastomeric compression pad or elastomer member circumferentially surrounding the ball screw and received in a counter bore of a non-rotating assembly having a bore receiving the ball screw with the pad confined on its outer diameter and at one axial end. A striker member, dimensioned to be receivable within an open axial end of the counter bore, functions as a stop member limiting axial movement of the ball nut. Upon projection of the striker member into the counter bore, further movement of the ball nut causes axial compression of the elastomer member providing resistance to further axial movement of the ball nut. At the same time, radial expansion of the elastomer member, caused by compression in the axial direction, causes the inner diameter of the elastomer member to frictionally engage the outer diameter of the ball screw to break rotation of the ball screw.

대표청구항 ▼

A ball screw brake and stop assembly comprising: a rotatable ball screw having an axially movable ball nut thereon, a non-rotatable member assembly surrounding an axial portion of the ball screw having a bore therethrough for receipt of the screw, a counter bore in the member assembly concentric wit

A ball screw brake and stop assembly comprising: a rotatable ball screw having an axially movable ball nut thereon, a non-rotatable member assembly surrounding an axial portion of the ball screw having a bore therethrough for receipt of the screw, a counter bore in the member assembly concentric with the bore and open to an axial end of the bore, an elastomeric member received in the counter bore having an at rest inner diameter surface closely spaced from an outer surface of the screw, a confined outer diameter, an axial end surface facing the open end of the counter bore and an opposite axial end surface bottomed against a bottom wall of the counter bore, an axial projection means associated with the nut and movable thereby dimensioned to be insertable into the counter bore, the elastomeric member being axially compressible by insertion of the projection means into the counter bore and radially expandable by axial compression, the radial expansibility of the elastomeric member being greater than the at rest spacing of the inner diameter thereof from the outer surface of the screw and the elastomeric member having a coefficient of friction effective to retard rotation of the ball screw upon radial expansion into outer surface contact with the ball screw surface and a compression resistance effective to retard axial movement of the nut upon axial compression of the elastomeric member caused by insertion of the projection means into the counter bore.