Engine and straddle-type vehicle including the same

摘要

An engine 40 includes a breather device 20 and an oil passage defining member 30 disposed in the breather device 20. The breather device 20 includes a breather main body 22 integral with a crankcase 50, and a breather cover 24. The breather main body 22 and the breather cover 24 define an enclosed space 26 in communication with an inner space of the crankcase 50. The oil passage defining member 30 includes a first member 32 integral with the crankcase 50, and a second member 34. The first and second members 32 and 34 define an oil passage 38. The crankcase 50 includes a transmission chamber 60 in which a main shaft 72 and a drive shaft 74 are disposed, and oil feed holes 82A to 82C through which the oil passage 38 and the transmission chamber 60 are in communication with each other.

主权项

1. An engine, comprising:
a crankcase including a transmission chamber; a crankshaft disposed in the crankcase; a transmission, including
a main shaft that is disposed in the transmission chamber of the crankcase and is configured to receive a driving force from the crankshaft to thereby rotate, anda drive shaft that is disposed in the transmission chamber of the crankcase and is configure to receive a driving force from the main shaft to thereby rotate; a breather device, including
a breather main body integral with the crankcase, anda breather cover separate from the breather main body and configure to attach to the breather main body,the breather main body and the breather cover defining an enclosed space in communication with an inner space of the crankcase, the breather device being arranged to separate oil contained in blowby gas flowing into the enclosed space and return the separated oil to the crankcase; and
an oil passage defining member disposed in the breather device, including
a first member integral with the crankcase, anda second member separate from the first member and configure to attach to the first member,the first member and the second member defining an oil passage through which the oil flows, the oil passage being in communication with the transmission chamber through an oil feed hole of the crankcase, the oil being supplied to the transmission through the oil feed hole.