| 摘要 |
PROBLEM TO BE SOLVED: To provide a rear wheel steering device in which various output characteristics can be set by a minimum change of components and whose cost can be reduced.SOLUTION: A rear wheel steering device of a vehicle comprises: an electric motor 20; speed reduction mechanisms (30, 40) connected to the output shaft 21 of the electric motor; and a direct-acting mechanism 50 having a nut member 51 and a rod 52 connected to the speed reduction mechanisms and converting rotational motion of the nut member into rectilinear motion of the rod. Each of the speed reduction mechanisms comprises: a drive pulley 31 connected to the output shaft of the electric motor; a driven pulley 32 connected to the nut member and supported by a housing 10 so as to be rotatable around the axis of the rod; a belt 33 stretched between the drive pulley and the driven pulley; and a planetary gear mechanism 40 which has a columnar pin 44 rotatably supporting a planetary gear 43 and fixed to the nut member, and in which a partition wall part 41s for separating the driven pulley from the planetary gear and stopping axial movement of the planetary gear by a prescribed distance or greater, is formed.SELECTED DRAWING: Figure 1 |
