Patent ID: 8096201
Filing Date: 2012-01-17
Classification: F16H,Y10T

Abstract:
1. A ball screw apparatus comprising: an elongated screw shaft including a helical groove formed on an outer peripheral surface thereof, a ball nut movably attached onto said elongated screw shaft, and including a bore formed therein for receiving said elongated screw shaft, and including a helical groove formed therein for engaging with said helical groove of said screw shaft and for forming an endless ball guiding passage between said screw shaft and said ball nut, a plurality of ball bearing members received in said endless ball guiding passage that is formed between said screw shaft and said ball nut for facilitating a movement between said screw shaft and said ball nut, a housing attached to said ball nut and moved in concert with said ball nut, and including a bore formed therein for receiving said elongated screw shaft, and including a slot formed therein and communicative with said bore of said housing, said housing including a second slot formed therein and disposed and arranged opposite to said slot of said housing and aligned with said slot of said housing for forming a circular structure together with said slot of said housing, and a wiper member engaged into said slot of said housing and including a wiper element provided thereon and engaged into said bore of said housing for engaging into said groove of said elongated screw shaft and for wiping off a dirt from said helical groove of said screw shaft and for preventing the dirt from entering into said helical groove of said screw shaft.