Wire harness installation structure

A wire harness installation structure comprising:

• a wire harness having bend flexibility;
• a protector configured to protect the wire harness while allowing the wire harness to make a bending movement about a bending position of the wire harness, the bending position being located between both ends of the wire harness;
• and
• a bending motion mechanism that causes the wire harness to make the bending movement, the bending motion mechanism including a first link and a second link that an end portion of the second link is attached to a halfway portion of the first link, wherein:
• the wire harness has a first portion that is fixed to the protector, a second portion that is distant from both of the first portion and the protector beyond the bending position, and a third portion that is located between the first portion and the second portion, and the third portion is offset in a direction of the bending movement from an imaginary straight line connecting the first portion and the second portion when the wire harness is in a first form in which the wire harness is routed so as to be stretched;
• the second portion and the third portion of the wire harness are fixed on a first harness fixing portion of the first link and a second harness fixing portion of the second link respectively, such that upon movement of one or more links of the bending motion mechanism the wire harness experiences a change in bend between the first portion and the third portion and between the second portion and the third portion, and the wire harness is routed so that a second excess length between the second portion and the third portion is shorter than a first excess length between the first portion and the third portion;
• the second portion and the third portion are each outside of the protector;
• the first harness fixing portion of the first link is formed at an end portion of the first link;
• and
• the second harness fixing portion of the second link is shaped like a projection piece that projects from the end portion of the second link that is attached to the halfway portion of the first link.