Patent ID: 7461572

Claim:
A rolling body screw device, comprising: a plurality of rolling bodies; a screw shaft having in an outer peripheral surface thereof a helical rolling groove in which the rolling bodies roll; a nut member having a through-hole through which the screw shaft is passed and having in an inner peripheral surface of the through-hole a helical load rolling groove forming a load rolling path for the rolling bodies together with the rolling groove; a return pipe having a non-load passage for the rolling bodies, the return pipe having a pair of return pipe halves split in the direction in which the non-load passage extends, with communication being established between both ends of the load rolling path to form in the nut member an endless circulation path for the rolling bodies; a pipe hold down member fixing the return pipe to the nut member so as to be astride the return pipe; and fastening members for fixing the pipe hold down member to the nut member, wherein each return pipe half has a flange portion protruding in a direction crossing the non-load passage, whereas the pipe hold down member has an engagement portion equipped with a recess to be fit-engaged with the return pipe and a pair of fixing leg portions covering the flange portions of the return pipe halves, with the fastening members being passed through the fixing leg portions of the pipe hold down member and the flange portions of the return pipe halves to be threadedly engaged with the nut member; and wherein, when the fixing leg portions of the pipe hold down member are fixed to the nut member by the fastening members, the engagement portion of the pipe hold down member tightens the pair of the return pipe halves so as to cause the split faces of the return pipe halves to abut each other, and wherein the pair of the fixing leg portions provided on the pipe hold down member are formed such that their distal end portions are inclined so as to extend away from the flange portions of the return pipe halves; and that, when the pair of the fixing leg portions are forcibly fixed to the flange portions of the return pipe halves by the fastening members, the engagement portion of the pipe hold down member undergoes elastic deformation so as to tighten the return pipe.