Motorcycle body frame structure
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsKazuhiko Tsunoda, Hiroyuki Furuyama, Toshimitsu Asakura, Tomoyuki Tagami
Life of this patent
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Abstract
A motorcycle body frame structure made of an aluminum-based alloy, and suitable for off-road jumping and landing due to its increased rigidity and toughness, and the large stroke of its shock absorber. Maintenance is facilitated because the upper frame member is detachable from the head pipe and from the coupling member connecting the rear portions of the upper and lower frame members. The strength of the engine hanger is enhanced by securing it to a member connecting the front and rear frame portions. A large-size fuel tank is accommodated in a space defined between the upper frame member and left and right lower frame members.
Claims10
In a motorcycle (1) having an engine (7) disposed between front and rear wheels (3, 5) and supported by a body frame (9) made of aluminum-based alloy and comprising a front frame portion (23) and a rear frame portion (27), said front frame portion extending rearwardly from a head pipe (17) steerably supporting an upper portion of a front fork (11) for suspending said front wheel, and said rear frame portion being connected to said front frame portion and having a rear fork (25) for supporting said rear wheel pivotally connected thereto, the improvement consisting of a body frame structure comprising
- (a) said front frame portion, being constituted by one upper frame member (29) and left and right lower frame members (31), said upper frame member extending rearwardly from an upper portion of said head pipe (17) above said engine, and said lower frame members extending rearwardly from a lower portion of said head pipe above or through an upper side of said engine;
- (b) a coupling member (71) connecting a rear portion of said upper frame member and rear portions of said lower frame members, said upper frame member being detachably connected to said head pipe and said coupling member;
- (c) a fuel tank (265) mounted on said front frame portion (23) in a space defined between said upper frame member (29) and said left and right lower frame members (31), said fuel tank (265) having at least two upwardly projecting portions, a fuel filler port (277) in an upper portion of one of said upwardly projecting portions, and a tubular member providing communication between an upper end of the projecting portion provided with said fuel filler port and an upper end of another of said at least two upwardly projecting portions.
Dependencies are inferred from the claim text.