| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve pressure capacity by making the circumference of the inside opening of an inside-outside communication hole longer, improve the machinability of a rail body 20, eliminating the thickness deviation of the rail body 20, manufacture the rail body 20 by using forging technology with a forging die in right-left symmetry, and improve pressure capacity by making the shortest distance L in the inside-outside communication hole 26 longer. <P>SOLUTION: An axial center A of an internal passage 25 corresponds to a rail center B. The outside opening of the inside-outside communication hole 26 is provided on a radial line C passing through the rail center B. An axial center D of the inside-outside communication hole 26 is provided at an angle to the line C. With the inside-outside communication hole 26 provided at the angle, the circumference of the inside opening of the inside-outside communication hole 26 is made longer to improve pressure capacity. The internal passage 25 and the outer peripheral face can be machined with the rail body 20 being rotated, thus improving the machinability. The thickness deviation of the rail body 20 is suppressed and no distortion occurs due to thermal effects. With the inside-outside communication hole 26 provided at the angle, the shortest distance L in the inside-outside communication hole 26 is made longer to improve pressure capacity. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
