| 摘要 |
PURPOSE:To improve strength of a measuring screw, by a method wherein a retainer is fitted to the rear part of a spline part of a rear end part of the measuring screw and fitted in a bored part provided in a rear end face of a spline bushing. CONSTITUTION:A spline part 12 is formed on a rear end part of a measuring screw 11 of an injection molding machine, an annular groove 20 is formed on the rear part of the spline part and the bottom of the groove is in a small- diameter part 13. A spline bushing 15 is fitted in the spline part 12 and a halved retainer 14 is fitted in the annular groove 20. The spline bushing 15 possesses bored part 21 whose inside diameter is equal to the outside diameter of the retainer 14. In addition, the spline part 12 in the measuring screw 11 is extended ahead in an axial direction from a front wall 22 of the annular groove 20 by depth amount L of the bored part 21 than a distance between bottom of the bored part 21 of the spline bushing 15 and the front of the spline bushing 15. The retainer 14 is made a small diameter by fitting to the rear of the spline part of the measuring screw 11, through which it is eliminated that the front of the measuring screw spline part 12 is made the smell diameter. |
