US 11,988,183 B2
Internal combustion engine and straddled vehicle
Kenji Nishida, Shizuoka (JP)
Assigned to YAMAHA HATSUDOKI KABUSHIKI KAISHA, Iwata (JP)
Filed by YAMAHA HATSUDOKI KABUSHIKI KAISHA, Iwata (JP)
Filed on Jun. 15, 2023, as Appl. No. 18/335,634.
Claims priority of application No. 2022-104882 (JP), filed on Jun. 29, 2022.
Prior Publication US 2024/0018930 A1, Jan. 18, 2024
Int. Cl. F02N 11/08 (2006.01); F02N 15/00 (2006.01); F02N 15/02 (2006.01); F16D 41/00 (2006.01)
CPC F02N 11/0851 (2013.01) [F02N 15/006 (2013.01); F02N 15/022 (2013.01); F16D 41/00 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An internal combustion engine comprising: a crankshaft; a starter motor including a motor shaft; a starter gear fixed to the crankshaft, the starter gear receiving a driving force from the motor shaft; a one-way clutch that is interposed between the crankshaft and the starter gear, the one-way clutch being configured to transmit a driving force from the starter gear to the crankshaft, and to block a driving force from the crankshaft to the starter gear; and a balancer, including a balancer drive gear fixed to the crankshaft, a balancer driven gear that is driven by the balancer drive gear to thereby rotate, wherein the one-way clutch and the balancer drive gear are formed integrally, wherein: the one-way clutch includes a cylindrical inner race, a cylindrical outer race arranged radially outward of the inner race, and a clutch element arranged between the inner race and the outer race; the outer race is fixed to the crankshaft; the inner race is formed integrally with the starter gear; and the balancer drive gear includes gear teeth formed integrally with the outer race, and wherein the gear teeth are formed on a radially outer portion of the outer race.