Suspension system for a front road wheel of a motorcycle

Claim 1

A link motion type suspension system for a front road wheel of a motorcycle, comprising: an upper fork supported on a body frame of said motorcycle; said upper fork comprising hollow component parts; said upper fork including a pair of side members (31, 31) each comprising: a pair of hollow outer frame members (32, 33) made of tubular materials, and a connecting member (34) for connecting said pair of outer frame members to each other, said connecting member being made of a material which is separate from said tubular material such that said connecting member defines a separate further component part of said upper fork; said outer frame members of each of said upper fork side members together defining substantially an isosceles triangle configuration, such that the width thereof in the longitudinal direction of said motorcycle is greatest at the center of each said upper fork side member; a lower fork supporting said front road wheel thereon; a shock absorber having one end thereof operatively connected between upper ends of said pair of upper fork side members, and the other end thereof operatively supported at substantially intermediate front portions of said pair of upper fork side members via a pair of oscillatory arms which are connected with said lower fork; links connecting said oscillatory arms with said lower fork; said pair of side members of said upper fork being respectively connected at lower ends thereof to a pair of lower fork side members via a pair of front arms, and at substantially intermediate rear portions thereof via a pair of rear arms; each of said upper fork side members being connected to a portion of said body frame at upper and intermediate portions of said side members.