A lubrication system of a power assembly of an electric scooter includes a case duct and a bearing seat duct formed in a case of the power assembly, and a driven gear shaft duct formed in a driven gear shaft of a driven gear. Lubricant flows to the case duct, the driven gear shaft duct, a driven gear bearing seat in the case, the bearing seat duct, a driving bearing seat in the case in sequence. The lubrication system has a short flowing distance of the lubricant to enhance the effects of lubrication and reducing temperature.

A sprocket assembly comprising a mount; and a sprocket having an opening for receiving the mount such that the sprocket can rotate around the mount, the sprocket having a plurality of radially extending fluid pathways extending from the opening to a radially distal edge, wherein the mount includes a manifold for fluid to be supplied to the sprocket, the manifold having a fluid exit channel towards the opening of the sprocket such that each radial pathway in the sprocket is in fluid communication with the manifold over only a part of a rotation of the sprocket about the mount.

A sprocket assembly comprising a mount; and a sprocket having an opening for receiving the mount such that the sprocket can rotate around the mount, the sprocket having a plurality of radially extending fluid pathways extending from the opening to a radially distal edge, wherein the mount includes a manifold for fluid to be supplied to the sprocket, the manifold having a fluid exit channel towards the opening of the sprocket such that each radial pathway in the sprocket is in fluid communication with the manifold over only a part of a rotation of the sprocket about the mount.

A motorcycle includes a head pipe, a main frame that extends rearwardly and downwardly from the head pipe, and a V-type engine supported by the main frame. Further, the motorcycle includes a rear frame that is supported by the main frame and extends rearwardly from the main frame, a seat arranged upwardly of the rear frame and supported by the rear frame and a tank forming member attached to part of the rear frame via a gasket. The rear frame and the tank forming member are formed by casting. Part of the rear frame, the gasket and the tank forming member integrally form an oil tank. The oil tank is located at a position farther downward than the seat.

A motorcycle includes a head pipe, a main frame that extends rearwardly and downwardly from the head pipe, and a V-type engine supported by the main frame. Further, the motorcycle includes a rear frame that is supported by the main frame and extends rearwardly from the main frame, a seat arranged upwardly of the rear frame and supported by the rear frame and a tank forming member attached to part of the rear frame via a gasket. The rear frame and the tank forming member are formed by casting. Part of the rear frame, the gasket and the tank forming member integrally form an oil tank. The oil tank is located at a position farther downward than the seat.

An electric vehicle comprises a driving motor which generates heat during an operation of the driving motor; a driving power transmission mechanism which transmits driving power of the driving motor to a rear wheel (drive wheel); an oil pan (first reservoir section) which is placed below the driving motor and reserves oil (coolant) therein; an oil reservoir (second reservoir section) which is placed above the driving motor and reserves the oil (coolant) therein; a fluid passage which causes the oil pan and the oil reservoir to be in communication with each other; and a pump which supplies the oil (coolant) from the oil pan to the oil reservoir through the fluid passage, and the oil reservoir includes a first drop hole through which the oil (coolant) is dropped toward the driving motor by a gravitational force.

An electric vehicle comprises a driving motor which generates heat during an operation of the driving motor; a driving power transmission mechanism which transmits driving power of the driving motor to a rear wheel (drive wheel); an oil pan (first reservoir section) which is placed below the driving motor and reserves oil (coolant) therein; an oil reservoir (second reservoir section) which is placed above the driving motor and reserves the oil (coolant) therein; a fluid passage which causes the oil pan and the oil reservoir to be in communication with each other; and a pump which supplies the oil (coolant) from the oil pan to the oil reservoir through the fluid passage, and the oil reservoir includes a first drop hole through which the oil (coolant) is dropped toward the driving motor by a gravitational force.

A straddle-type vehicle includes a drive unit used for driving a rear wheel of the straddle-type vehicle, wherein a discharge port that discharges oil in the drive unit is installed on a lower section of the drive unit, and a guide that guides oil to an outside in a vehicle width direction is installed in a vicinity of a lower section of the discharge port.

A motorcycle includes a head pipe, a main frame that extends rearwardly and downwardly from the head pipe, and a V-type engine supported by the main frame. Further, the motorcycle includes a rear frame that is supported by the main frame and extends rearwardly from the main frame, a seat arranged upwardly of the rear frame and supported by the rear frame and a tank forming member attached to part of the rear frame via a gasket. The rear frame and the tank forming member are formed by casting. Part of the rear frame, the gasket and the tank forming member integrally form an oil tank. The oil tank is located at a position farther downward than the seat.

A motorcycle includes a head pipe, a main frame that extends rearwardly and downwardly from the head pipe, and a V-type engine supported by the main frame. Further, the motorcycle includes a rear frame that is supported by the main frame and extends rearwardly from the main frame, a seat arranged upwardly of the rear frame and supported by the rear frame and a tank forming member attached to part of the rear frame via a gasket. The rear frame and the tank forming member are formed by casting. Part of the rear frame, the gasket and the tank forming member integrally form an oil tank. The oil tank is located at a position farther downward than the seat.