초록 ▼

In a motorcycle equipped with a water-cooled engine, part of the frame, on which the engine is supported, is used as a passage for engine cooling water. The above part of the frame may be formed of a hollow tubular member which can be separated from the frame body. The hollow tubular member may be d

In a motorcycle equipped with a water-cooled engine, part of the frame, on which the engine is supported, is used as a passage for engine cooling water. The above part of the frame may be formed of a hollow tubular member which can be separated from the frame body. The hollow tubular member may be disjoinably joined to the frame body by coupling means utilizing engagement of a pair of a protuberance and a recess or engagement of a pair of a convex surface and a concave surface.

대표청구항 ▼

In a motorcycle including a water-cooled engine, a radiator operable to cool water for cooling said engine, passage means connecting said engine with said radiator and forming a circuit for said cooling water in cooperation with said engine and said radiator, and a frame on which said engine and sai

In a motorcycle including a water-cooled engine, a radiator operable to cool water for cooling said engine, passage means connecting said engine with said radiator and forming a circuit for said cooling water in cooperation with said engine and said radiator, and a frame on which said engine and said radiator are supportedly mounted, the improvement wherein said frame comprises: at least one axially extending main frame member forming an upper part of said frame, said main frame member having a substantially horizontally extending front portion and a rear portion extending rearwardly from said front portion; and at least one separable hollow tubular member forming a lower part of said frame and having (i) a front portion joined to said front portion of said main frame member and extending substantially vertically downwardly therefrom and (ii) a rear portion substantially horizontally rearwardly extending from said front portion thereof and joined to said rear portion of said main frame member, said hollow tubular member being separable from said main frame member, the interior of said hollow tubular member forming part of said circuit for said cooling water; and coupling means for disjoinably joining said separable hollow tubular member to said main frame member.