Abstract: A heat bolt unit according to one embodiment includes a plurality of heat bolts disposed in parallel to one another, and a holding portion that holds the plurality of heat bolts. The holding portion holds a base end portion of each of the plurality of heat bolts disposed in parallel to one another. In other words, the holding portion holds the plurality of heat bolts disposed in parallel to one another in a cantilever manner.

Abstract: Engaging pieces (35) for receiving a load are provided in sections of a rear frame (26) corresponding to both ends of a seat (9) in a width direction of a vehicle so as to project upward. Movably supported plates (61), which are movably supported by the engaging pieces (35), are formed at both ends of a bottom plate (51) of the seat (9) in the width direction of the vehicle, which are sections opposed to the engaging pieces (35). These movably supported plates 61 are positioned above the other sections of the bottom plate (51). Inner cushion materials (53, 54) harder than a cushion material (52) on a seat surface side are provided between these movably supported plates (61). The bottom plate (51) of the seat (9) is movably supported by the projecting pieces (35) at both the ends thereof and is never displaced in a height direction.

Abstract: Engaging pieces (35) for receiving a load are provided in sections of a rear frame (26) corresponding to both ends of a seat (9) in a width direction of a vehicle so as to project upward. Movably supported plates (61), which are movably supported by the engaging pieces (35), are formed at both ends of a bottom plate (51) of the seat (9) in the width direction of the vehicle, which are sections opposed to the engaging pieces (35). These movably supported plates 61 are positioned above the other sections of the bottom plate (51). Inner cushion materials (53, 54) harder than a cushion material (52) on a seat surface side are provided between these movably supported plates (61). The bottom plate (51) of the seat (9) is movably supported by the projecting pieces (35) at both the ends thereof and is never displaced in a height direction.

Abstract: A motorcycle frame assembly arranged to have a desirable amount of rigidity in both transverse and vertical directions. The frame assembly desirably includes a head pipe configured to support a front wheel and associated suspension assembly. A main tube and down tube extend in a rearward direction from the head pipe. Desirably, the main tube is elliptical in cross-section, with the longer dimension being arranged generally horizontally and the shorter dimension being arranged generally vertically. Preferably, the main tube is arcuate along its length and defines a convex outer surface portion opposing a concave outer surface portion. Preferably, the main tube is arranged such that the convex outer surface portion faces the down tube. Desirably, the main tube also extends from the head pipe such that the main tube is lower than perpendicular with respect to the head pipe.

Abstract: A motorcycle frame assembly arranged to have a desirable amount of rigidity in both transverse and vertical directions. The frame assembly desirably includes a head pipe configured to support a front wheel and associated suspension assembly. A main tube and down tube extend in a rearward direction from the head pipe. Desirably, the main tube is elliptical in cross-section, with the longer dimension being arranged generally horizontally and the shorter dimension being arranged generally vertically. Preferably, the main tube is arcuate along its length and defines a convex outer surface portion opposing a concave outer surface portion. Preferably, the main tube is arranged such that the convex outer surface portion faces the down tube. Desirably, the main tube also extends from the head pipe such that the main tube is lower than perpendicular with respect to the head pipe.