| 摘要 |
PURPOSE: A washer is provided to include a tapered inner circumferential surface by the predetermined inclination, thereby including the upper portion thereof loosely inserted into the tip of injector and the lower portion thereof forcedly inserted into the tip of injector. CONSTITUTION: A washer includes a flat top surface (10), a flat bottom surface (20), an inner circumferential surface (30), and a hollow part (40). The top surface has a penetration hole in the center thereof. The bottom surface has the penetration hole which has the concentric axis with the top surface. The inner circumferential surface is arranged between the inner periphery of the top surface and the inner periphery of bottom surface. The hollow part includes the inner circumferential surface as the side wall, and opens to the penetration hole of top surface and the penetration hole of bottom surface. The inner circumferential surface is tapered by the inclination (a) of 4° to 10°, and the hollow part includes several straight-lines (22a,22b,22c,22d) which are formed along the inner circumferential surface.
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