| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent a bearing surface from being locally crushed, in a power transmission device wherein two rotors are concentrically arranged for transmitting rotating power and joined to each other by screwing and a bearing surface is formed in a conical shape. <P>SOLUTION: In the power transmission device, a driven shaft 10 has a thread portion 14, a small diameter shaft portion 11, a large diameter shaft portion 12, and a truncated-cone-shaped tapered shaft portion 13, and the first rotor 20 has a center hole 25 including a tapered hole portion 27. When the first rotor 20 is threaded to the thread portion 14, the outer peripheral face of the tapered shaft portion 13 has close contact with a peripheral wall face 29 of the tapered hole portion 27. The peripheral wall face 29 consists of: a conical peripheral wall face 29a; and a curved peripheral wall face 29b smoothly ranging from the conical peripheral wall face 29a and curved and unfolded into a horn shape. The curved peripheral wall face 29b is arranged so that a gap is formed between a ridge line 15 formed on a boundary between the tapered shaft portion 13, and the large diameter shaft portion 12 and the peripheral wall face 29. <P>COPYRIGHT: (C)2008,JPO&INPIT |
