| 摘要 |
PROBLEM TO BE SOLVED: To reduce slide resistance against an internal wall surface of a guide tube.SOLUTION: In a curved portion 21 of an oil level gauge 2, in a section A-A shown in Fig. 3 (b), lateral both ends 213, 214 of a crest part 212 are moderately curved to protrude upward. Top surfaces of the lateral both ends 213, 214 of the crest part 212 are brought into contact with an inner wall surface of a guide tube 3. The lateral both ends 213, 214 of the crest part 212 moderately curved to protrude upward have large curvature radii, thereby increasing contact area. Slide resistance between the crest part 212 of the oil level gauge 2 and the inner wall surface of the guide tube 3 can be reduced, accordingly. |
