Patent ID: 8051736

Claim:
A ball screw device comprising: a nut member including a screw hole formed therein and defined by a helical groove, and including two first longitudinal orifices and two second longitudinal orifices formed in said nut member and communicating with said helical groove of said nut member, and said first and said second orifices of said nut member including a longitudinal axis aligned with said helical groove of said nut member and inclined relative to a radial axis of said nut member, said nut member including a first axial ball return channel formed therein and opened through a first end portion of said nut member and intersecting and communicating with said first orifices of said nut member, and including a second axial ball return channel formed therein and opened through a second end portion of said nut member and intersecting and communicating with said second orifices of said nut member, and including an acute angle formed between said first axial ball return channel and said second axial ball return channel of said nut member, an elongated screw engaged into said screw hole of said nut member and including a helical groove for engaging with said helical groove of said nut member and for forming a first endless ball guiding passage and a second endless ball guiding passage between said nut member and said screw, a plurality of ball bearing members engaged in said first and said second endless ball guiding passages of said ball screw device, and a deflecting device including two first deflecting members, one of said two first deflecting members being engaged into each of said first orifices of said nut member respectively, said first deflecting members each including a ball deflecting channel formed therein, and said ball deflecting channels of said first deflecting members each including a first end portion communicating with said helical groove and said first endless ball guiding passage of said nut member, and each including a second end portion communicating with said first axial ball return channel of said nut member for forming said first endless ball guiding passage of said ball screw device and for receiving said ball bearing members, and said deflecting device including two second deflecting members, one of said two second deflecting members being engaged into each of said second orifices of said nut member respectively, said second deflecting members each including a ball deflecting channel formed therein, and said ball deflecting channels of said second deflecting members each including a first end portion communicating with said helical groove and said second endless ball guiding passage of said nut member, and each including a second end portion communicating with said second axial ball return channel of said nut member for forming said second endless ball guiding passage of said ball screw device and for receiving said ball bearing members.