TRANSMISSION OF INTERNAL COMBUSTION ENGINE

摘要

A transmission of an internal combustion engine in which the shaft length of a main shaft can be shortened to eliminate a supporting wall around a reduction gear while a thrust load is received. Around a main shaft of a transmission of an internal combustion engine, a primary bearing is fastened to an inside of a primary driven gear, and is disposed between the primary driven gear and the main shaft. A collar member is disposed between the primary bearing and a main bearing. A step portion, in contact with the main bearing, is formed on the main shaft on an opposite side of the main bearing from the collar member. A cylindrical portion, an inner race of the primary bearing, the collar member, and an inner race of the main bearing are fastened to the side of the step portion.

主权项

1. A transmission of an internal combustion engine, the transmission comprising:
a primary driven gear for meshing with a primary drive gear provided on a crankshaft side of an engine, said primary driven gear being rotatable on a main shaft of the transmission; a clutch including a clutch outer rotating integrally with the primary driven gear and a clutch center that is provided so as to be rotatable relative to the clutch outer, said clutch center rotates integrally with the main shaft and is fastened in an axial direction by a fastening member; a main bearing provided between the main shaft and a transmission case wall portion, said main bearing being capable of transmitting a thrust load to the transmission case wall portion; the primary drive gear and the primary driven gear being formed as helical gears; around the main shaft:
a primary bearing is fastened to an inside of the primary driven gear, and is disposed between the primary driven gear and the main shaft; anda collar member is disposed between the primary bearing and the main bearing; anda step portion is in contact with the main bearing, the step portion being formed on the main shaft on an opposite side of the main bearing from the collar member;a cylindrical portion of the clutch center, an inner race of the primary bearing, the collar member, and an inner race of the main bearing being fastened to a side of the step portion by fastening the fastening member.