Rack shaft support device and steering system including rack shaft support device

A rack shaft support device comprising:

• a support yoke arranged in an accommodating portion of a rack housing for accommodating a rack shaft, the support yoke moving the rack shaft in a pressing direction toward a pinion shaft in the accommodating portion;
• a plug including:
• a plug fixing portion arranged across the support yoke from the rack shaft in the accommodating portion, the plug fixing portion being fixed to the rack housing,
• a plug cam portion having a first cam face, the plug cam portion being arranged closer to the support yoke than the plug fixing portion,
• a plug back wall portion formed across the plug fixing portion from the support yoke, and
• a first restricting portion having a first body portion and a first facing portion, the first restricting portion protruding from the plug back wall portion toward the support yoke;
• an intermediate cam component including:
• an intermediate cam body arranged closer to the support yoke than the plug in the accommodating portion, and the intermediate cam body having an axis extending in the pressing direction,
• an intermediate cam portion having a second cam face contacting the first cam face, the intermediate cam portion being formed around the intermediate cam body, and
• a second restricting portion having a second body portion and a second facing portion, the second restricting portion protruding from the intermediate cam body toward the plug and overlapping the first restricting portion in a direction intersecting with the axis of the intermediate cam body;
• and
• a rotation force generating spring connected to the plug, the rotation generating spring applying a force to the intermediate cam component to cause the intermediate cam component to rotate with respect to the plug, the rotation force generating spring having a coil-shaped spring winding portion, a first spring end portion and a second spring end portion, wherein
• the first restricting portion and the second restricting portion are inserted in a radially inner side of the spring winding portion,
• the first body portion of the first restricting portion retains the first spring end portion, and the first facing portion of the first restricting portion overlaps the second restricting portion in the direction that intersects with the axis of the intermediate cam body, and
• the second body portion of the second restricting portion retains the second spring end portion, and the second facing portion of the second restricting portion overlaps the first facing portion in the direction that intersects with the axis of the intermediate cam body.