초록 ▼

In a frame structure of a small vehicle, an abutting surface abutting against a first frame member is provided on a second frame member constituting a part of a vehicle frame together with the first frame member. The second frame member is welded to the first frame member by an outer periphery of t

In a frame structure of a small vehicle, an abutting surface abutting against a first frame member is provided on a second frame member constituting a part of a vehicle frame together with the first frame member. The second frame member is welded to the first frame member by an outer periphery of the abutting surface. The two frame members constituting a part of the vehicle frame are also welded together by the outer periphery of the abutting surface formed on the second frame member so as to abut against the first frame member. This achieves a decrease in the size and weight of the second frame member while sufficiently ensuring joining strength thereof. An opening portion open to an abutting surface is provided in a second frame member to expose a part of a first frame member. The second frame member is welded to the first frame member by a periphery of the opening portion.

대표청구항 ▼

What is claimed is: 1. A vehicle frame structure of a small vehicle, comprising: a first frame member; a second frame member, said second frame member including an abutting surface abutting against said first frame member, said second frame member being welded to said first frame member by an outer

What is claimed is: 1. A vehicle frame structure of a small vehicle, comprising: a first frame member; a second frame member, said second frame member including an abutting surface abutting against said first frame member, said second frame member being welded to said first frame member by an outer periphery of the abutting surface, wherein an opening portion open to the abutting surface is provided in said second frame member to expose a part of said first frame member, and said second frame member is welded to said first frame member by a periphery of the opening portion, the periphery of the opening portion being different than the outer periphery of the abutting surface. 2. The vehicle frame structure according to claim 1, wherein said second frame member includes an abutment support portion, a pair of coupling portions branched from the abutment support portion and a coupling plate coupling the abutment support portion and the pair of coupling portions, the abutting surface being provided on the abutment support portion. 3. The vehicle frame structure according to claim 2, wherein said second frame member further includes reinforcement ribs protruding upwardly from the pair of coupling portions, the reinforcement ribs being continuous with the abutment support portion and the pair of coupling portions. 4. The vehicle frame structure according to claim 3, wherein said second frame member further includes a center coupling portion protruding from a continuous portion of both of the pair of coupling portions with the abutment support portion, and a reinforcement rib protrudes upward to be continuous with the center coupling portion and the abutment support portion. 5. The vehicle frame structure according to claim 4, further comprising: a pair of third frame members, said pair of third frame members being connected to the pair of coupling portions, respectively; and a fourth frame member, said fourth frame member being connected to said center coupling portion. 6. The vehicle frame structure according to claim 5, further comprising a pair of fifth frame members, said pair of fifth frame members being connected between one of said pair of coupling portions and said fourth frame member, respectively. 7. A vehicle frame structure of a small vehicle, comprising: a head pipe; a down pipe for supporting a lower portion of an engine; and a gusset coupling said head pipe and said down pipe to each other, said gusset including an abutting surface abutting against the head pipe, said gusset being welded to said head pipe by an outer periphery of the abutting surface, wherein an opening portion open to the abutting surface is provided in the gusset to expose a part of the head pipe, and said gusset is welded to the head pipe by an inner periphery of the opening portion. 8. The vehicle frame structure according to claim 7, wherein said gusset includes an abutment support portion, a pair of coupling portions branched from the abutment support portion and a coupling plate coupling the abutment support portion and the pair of coupling portions, the abutting surface being provided on the abutment support portion. 9. The vehicle frame structure according to claim 8, wherein said gusset further includes reinforcement ribs protruding upwardly from the pair of coupling portions, the reinforcement ribs being continuous with the abutment support portion and the pair of coupling portions. 10. The vehicle frame structure according to claim 9, wherein said gusset further includes a center coupling portion protruding from a continuous portion of both of the pair of coupling portions with the abutment support portion, and a reinforcement rib protrudes upward to be continuous with the center coupling portion and the abutment support portion. 11. The vehicle frame structure according to claim 10, further comprising: a pair of down pipes, said pair of down pipes being connected to the pair of coupling portions, respectively; and a tension pipe, said tension pipe being connected to said center coupling portion. 12. The vehicle frame structure according to claim 11, further comprising a pair of reinforcement pipes, said pair of reinforcement pipes being connected between one of said pair of coupling portions and said tension pipe, respectively. 13. A vehicle frame structure of a small vehicle, comprising: a first frame member; a second frame member, said second frame member including an abutment support portion having an abutting surface abutting against said first frame member, said second frame member being welded to said first frame member around an outer periphery of the abutting surface, wherein an aperture is formed through the abutment support portion and the abutting surface to expose a part of said first frame member, and said second frame member is welded to said first frame member around an inner periphery of the aperture. 14. The vehicle frame structure according to claim 13, wherein said second frame member further includes a pair of coupling portions branched from the abutment support portion and a coupling plate coupling the abutment support portion and the pair of coupling portions. 15. The vehicle frame structure according to claim 14, wherein said second frame member further includes reinforcement ribs protruding upwardly from the pair of coupling portions, the reinforcement ribs being continuous with the abutment support portion and the pair of coupling portions. 16. The vehicle frame structure according to claim 15, wherein said second frame member further includes a center coupling portion protruding from a continuous portion of both of the pair of coupling portions with the abutment support portion, and a reinforcement rib protrudes upward to be continuous with the center coupling portion and the abutment support portion. 17. The vehicle frame structure according to claim 16, further compnsing: a pair of third frame members, said pair of third frame members being connected to the pair of coupling portions, respectively; and a fourth frame member, said fourth frame member being connected to said center coupling portion. 18. The vehicle frame structure according to claim 17, further comprising a pair of fifth frame members, said pair of fifth frame members being connected between one of said pair of coupling portions and said fourth frame member, respectively.