| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a tapered roller having reduced dimensional dispersion between products, and to provide a method of machining the same and a tapered roller bearing easy to assemble. <P>SOLUTION: A recess forming portion 1a<SB>1</SB>is provided at the center of a lower side end face 1a of a punch 1, and a recessed formed and fabricated material escape portion 1a<SB>2</SB>is formed adjacent thereto. y≤-1.391x+31.49 is established where ψDy is the material linear diameter of a roller formed and fabricated material 3, y is the linear diameter ratio thereof, ψD<SB>A</SB>is the diameter of the small diameter end face of the tapered roller 53, ψD<SB>B</SB>is the diameter of the large diameter end face 53b of the tapered roller 53, and x is the taper angle of a machined face 2a. y is assigned to y=100(ψDy-ψD<SB>A</SB>)/(ψD<SB>B</SB>-ψD<SB>A</SB>) to specify ψDy, thus improving the accuracy of the axial dimension. <P>COPYRIGHT: (C)2011,JPO&INPIT |
