REAR WHEEL STEERING APPARATUS FOR VEHICLE

摘要

A rear wheel steering apparatus for a vehicle includes a housing including a cylinder portion and a connection cover, an electric motor housed in the housing, a speed reduction mechanism housed in the housing, a linear motion mechanism including a nut member and a rod for converting a rotation of the nut member to a linear motion of the rod, the cylinder portion including a stopper portion provided at an inner surface of thereof between the electric motor and the speed reduction mechanism, a cylindrical holding member holding the speed reduction mechanism in the cylinder portion, and a bearing supporting the nut member for allowing the nut member to rotate relative to the cylindrical holding member. The bearing and the cylindrical holding member are sandwiched between the stopper portion and the connection cover and the cylindrical holding member is retained so as not to rotate relative to the cylinder portion.

主权项

1. A rear wheel steering apparatus for a vehicle, comprising:
a housing configured to be connected to a suspension mechanism supporting vehicle rear wheels via a first connection member and a second connection member, the housing including a cylinder portion and a connection cover; an electric motor housed in the housing; a speed reduction mechanism housed in the housing and reducing speed of an output of the electric motor; a linear motion mechanism including a nut member rotatably connected to the speed reduction mechanism, the linear motion mechanism including a rod threadingly engaged with the nut member and connected to the second connection member, the linear motion mechanism converting a rotation of the nut member to a linear motion of the rod; the cylinder portion housing the electric motor and the speed reduction mechanism which are arranged in series, the cylinder portion including a stopper portion provided at an inner surface of the cylinder portion between the electric motor and the speed reduction mechanism; the connection cover including the first connection member and closing an opening of the cylinder portion provided closer to the speed reduction mechanism; a cylindrical holding member holding the speed reduction mechanism in the cylinder portion; and a bearing supporting the nut member for allowing the nut member to rotate relative to the cylindrical holding member; wherein the bearing and the cylindrical holding member are sandwiched between the stopper portion of the cylinder portion and the connection cover and the cylindrical holding member is retained so as not to rotate relative to the cylinder portion.