Rear wheel steering apparatus for vehicle

A rear wheel steering apparatus for a vehicle configured to be provided at a suspension mechanism supporting a rear wheel of the vehicle and for steering the rear wheel, the rear wheel steering apparatus comprising:

• a housing configured to be connected to the suspension mechanism via a first connection member and a second connection member, the housing including a cylinder portion and a casing;
• an electric motor housed in the cylinder portion;
• a speed reduction mechanism housed in the cylinder portion and reducing speed of an output of the electric motor;
• a linear motion mechanism including a nut member rotatably connecting to the speed reduction mechanism and a rod threadingly engaged with the nut member and connecting to the second connection member, the linear motion mechanism converting a rotation of the nut member to a linear motion of the rod;
• the casing including at least one opening portion that opens in parallel to the rod and a communication hole provided separately from the opening portion, the casing positioned surrounding the rod extending from the cylinder portion and being fixed to the cylinder portion;
• a cover member joined to the casing to seal the opening portion of the casing;
• a controller housed in the casing and controlling an actuation of the electric motor;
• a power line and a signal line electrically connected to the controller in the casing;
• and
• a thermal shrinkage tube surrounding the power line and the signal line to retain thereof;
• wherein
• the power line and the signal line are liquid-tightly supported in the communication hole of the casing via the thermal shrinkage tube.