US 12,263,909 B2
Cast swing arm
Masaki Nishimura, Tokyo (JP); and Kazuhiro Sakakibara, Tokyo (JP)
Assigned to HONDA MOTOR CO., LTD., Tokyo (JP)
Filed by HONDA MOTOR CO., LTD., Tokyo (JP)
Filed on Mar. 18, 2022, as Appl. No. 17/698,357.
Claims priority of application No. 2021-062324 (JP), filed on Mar. 31, 2021.
Prior Publication US 2022/0315159 A1, Oct. 6, 2022
Int. Cl. B62K 25/28 (2006.01)
CPC B62K 25/28 (2013.01) 8 Claims
OG exemplary drawing
 
1. A cast swing arm comprising:
pivot portions;
left and right arm portions extending on a rear side from the pivot portions; and
a crossing portion connecting the left and right arm portions, the cast swing arm being casted by a plurality of casting molds,
wherein the arm portions include upper walls, lower walls, outer walls, and inner walls and include an inner space with a hollow inside,
recessed portions recessed toward the inner space are formed in the outer walls of the arm portions,
each of the outer walls is formed with chamfered portions to which a corresponding upper wall and a corresponding lower wall are connected, respectively, and which sandwich a corresponding recessed portion in an up-down direction,
end portions of the chamfered portions are defined as parting lines at which the plurality of casting molds come into contact with each other.