Patent ID: 9133884
Filing Date: 2015-09-15
Classification: F16D

Abstract:
1. A ball spline device comprising: an elongated shaft including a plurality of longitudinal channels formed therein, a nut member including a bore formed therein for receiving and engaging with said shaft, and including two end portions each having a compartment formed therein and communicating with said bore of said nut member, said compartments of said nut member including an inner diameter (D) greater than an inner diameter (d) of said bore of said nut member for forming an inner peripheral swelling in said nut member, said nut member including a plurality of longitudinal recesses formed in said swelling and communicating with said bore of said nut member and aligned with said longitudinal channels of said shaft, and including a plurality of longitudinal grooves formed therein and communicating with said compartments of said nut member, but offset from said bore of said nut member, a plurality of ball bearing members engaged in said longitudinal channels of said shaft and said longitudinal recesses of said swelling of said nut member, and two deflecting devices engaged onto said shaft and engaged into said compartments of said nut member and attached to said end portions of said nut member respectively, said deflecting devices each including a plurality of curved guiding pathways formed therein, and said curved guiding pathways of said deflecting devices each including an inlet portion directed toward and communicating with said longitudinal recess of said nut member and said longitudinal channel of said shaft for guiding said ball bearing members into and out of said curved guiding pathways of said deflecting devices respectively, and an outlet portion directed toward and communicating with said groove of said nut member respectively for forming an endless ball guiding passage in said ball spline device and for guiding said ball bearing members into and out of said grooves of said nut member, wherein said deflecting devices each include an opening formed therein for slidably receiving and engaging with said shaft, and each include a plurality of bulges extended radially into said opening and slidably engaged with said channels of said shaft for positioning said deflecting devices to said shaft.