| 摘要 |
PROBLEM TO BE SOLVED: To reduce partial stress concentration by rotary moment transmitted from a crank shaft. SOLUTION: This inner rotor of the inscribing gear pump is constituted in such a way that the crank shaft 6 and a mounting hole 5 are provided with four linear connection parts 12, 12, 12, 12 for connecting main circular arc parts 11, 11, 21, 21 adjacent to four main circular arc parts 11, 21 on the same circle, and opposing connection parts 12, 12, 22, 22 have substantially parallel cross sectional shapes. In this inner rotor, since rotary force is applied to the mounting hole 5 from corner parts 13, 13, 13 in three sections of the crank shaft 6 among corner parts 13, 23 in four sections in the direction of rotation formed by the main circular arc parts 11, 21 and the linear connection parts 12, 22, stress generated in one section is reduced to about 3/4 of conventional stress. COPYRIGHT: (C)2005,JPO&NCIPI
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