To provide a feed screw mechanism of an electric motor capable of reducing axial dislocation caused by lack of the support point number of a rotary shaft, while eliminating degradation of characteristics in position control of a stepping motor caused by viscosity of oil.
Cutting work of a male screw 42 is performed on a metallic shaft part 32, and a female screw 43 is formed in a resin out-fitting part 14. A clearance 81 is secured between the male screw 42 of the shaft part 32 and the female screw 43 of the out-fitting part 14, and a thermal expansion difference can be absorbed. A step height part 91 different in the depth is arranged in a portion of a female screw root 71 of the out-fitting part 14, and a guide area 111 being narrow in a clearance dimension is set in a part in the axial direction between the male screw 42 and the female screw 43.
| JP5333134 | Grab tool |
| JP2008312310 | CYCLOID MOTOR |
ICHIKAWA TOSHIRO
MAGAI KAZUMI
KOGO TETSUYA
| JPH06323390A | 1994-11-25 | |||
| JP2007314118A | 2007-12-06 | |||
| JPH01112211A | 1989-04-28 | |||
| JP2008051335A | 2008-03-06 |
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