Patent ID: 9527544
Filing Date: 2016-12-27
CPC Classification: B62K

Claim Text:
1. A vehicle body frame structure of a motorcycle, comprising: a head frame including right and left frame parts that extend downward and rearward while widening at a rear of a head pipe; right and left tank rails that are joined to rear ends of the corresponding frame parts and extend downward and rearward; right and left joint parts joining each of the corresponding frame parts to each the rail parts; and a body frame that is joined to rear ends of the right and left tank rails and supports a swing arm, wherein: each frame part includes a closed cross section structure and also includes an open cross section structure at a part thereof in a longitudinal direction; each tank rail includes a closed cross section structure and also includes an open cross section structure at a part thereof in a longitudinal direction; at each of the joint parts, each of the frame parts have the closed cross section structure and each of the tank rails have has the closed cross section structure; each of the open cross section structure of the frame part and the open cross section structure of the tank rail is used as an engine suspension part; the open cross section structure of each of the frame parts and the open cross section structure of each of the tank rails are located in front and rear of each of the joint parts of the frame parts and the tank rails, and located ahead of right and left second joint parts between each of the tank rails and the body frame; an engine bracket part having an open cross section structure is integrally molded at a lower portion of the right and the left frame parts and at a position close to the corresponding right and left tank rails, extends downward and rearward, and has an engine suspension boss formed at a tip; a hollow part becomes gradually narrower at a part of the lower portion of each of the right and the left frame parts and continues to the engine bracket part; a right and a left second engine bracket part that extends downward and frontward, has an open cross section structure, and is integrally molded to the corresponding open cross section structure of the right and the left tank rail; and a right and a left second engine suspension boss formed at a tip of the corresponding right and left second engine bracket part.