Exemplary embodiments are directed to a bell housing with an adjustable register plate for providing adjustable engine crankshaft-transmission alignment. The bell housing includes a body adapted for attachment to an engine block. The adjustable register plate includes a register bore for accommodating the transmission. The register plate can be secured to the bell housing by inserting register plate fasteners through register plate fastener holes into the corresponding register plate attachment holes of the bell housing. The alignment of the register plate relative to the bell housing, and thereby alignment of the transmission with the crankshaft, can be adjusted by loosening the fasteners and moving the register plate laterally, about the register plate fasteners, relative to the bell housing, and then tightening the fasteners to locate the register plate in the desired position.

An engine is disclosed of the V-configuration having an integrated engine and transmission. The engine has an engine ventilation system communicating between the crankcase and an upper end of the valve cover, whereby blow-by gases can be returned to the air intake system to recycle the unspent fuel. The engine also includes an easily accessible/removable cam, such that the camshaft may be removed without removing the rocker arms. The engine also includes a lubrication system for lubricating components of the engine and transmission.

A two-wheeled vehicle includes a frame assembly having a front end and a rear end, a front ground-engaging member, a rear ground-engaging member, a front fender coupled to the front end of the frame assembly, a rear fender coupled to the rear end of the frame assembly, and at least one saddle bag supported by the rear end of the frame assembly. The at least one saddle bag has a front end, a rear flap generally opposite the front end, an inner side wall coupled to the front end, and an outer side wall generally opposite the inner side wall and coupled to the front end and the rear flap to define an internal cargo portion of the at least one saddle bag. The rear flap defines a rear portion of the internal cargo portion.

Provided is a saddle-ride type vehicle, which does not reduce cooling efficiency of an engine, is hardly affected by heat from the engine, and can increase a degree of freedom of configuration such as the orientation at the time of arrangement, size and shape of a shift actuator. The saddle-ride type vehicle (100) includes the engine (120), and the engine (120) has a cylinder block (120a), a cylinder head (120b) and a head cover (120c) and has a crankcase (123) below the cylinder block (120a). The saddle-ride type vehicle (100) also includes a shift drum drive unit (140) for rotating a shift drum (136) which changes a gear train (133) in a transmission (132). The shift drum drive unit (140) includes a shift actuator (141) formed of an electric motor, and a decelerator (142). The shift drum drive unit (140) is attached to a front surface of the crankcase (123) below the cylinder block (120a) via a unit case (146) housing the decelerator (142).

A power unit includes: a crankcase which accommodates a crankshaft and a main shaft arranged in parallel to each other; a crank side cover which covers one end portion of the crankshaft from the outside in an axial direction of the crankshaft; a primary driven gear which is provided in the main shaft and meshes with a primary drive gear of the crankshaft; a clutch provided at one end portion of the main shaft; and a clutch cover which covers the clutch from the outside in an axial direction of the main shaft and is fastened and fixed to a packing surface provided on the crankcase to surround the clutch, wherein the primary driven gear and the packing surface overlap in a virtual straight line when viewed from the axial direction of the main shaft.

In a speed change apparatus for a vehicle, a controller stores as a clutch-disengaging shift spindle angle 1 a position at which a clutch is disengaged when a shift spindle is rotated in a first direction. The controller controls the shift spindle by a first step W1 of rotating the shift spindle in the first direction until a disengaging-side target angle Ta1 is reached; a second step W2 of returning the shift spindle in a second direction opposite to the first direction; and a third step W3 of rotating the shift spindle in the first direction up to the clutch-disengaging shift spindle angle 1 and thereafter rotating the shift spindle in the second direction to return the shift spindle, upon detection of an output from a drum angle sensor, the output corresponding to shallow engagement of dog teeth.

A power train includes: an engine including an engine case; a transmission including a transmission case that is fastened to the engine case; an electric motor provided inside the transmission case; and a heat insulator provided between the engine case and the transmission case, and being lower than thermal conductivity of the engine case and thermal conductivity of the transmission case.

An internal combustion engine has a plurality of cylinders and transmission arranged adjoining the engine. If designating an average height of a combustion chamber in a region inside from a virtual cylindrical surface passing through center of a valve body of an intake valve and extending in a circumferential direction of each cylinder when a piston is at top dead center, as center height, and designating average of a height of the combustion chamber in a region outside from the virtual cylindrical surface when the piston is at top dead center, as peripheral height, the combustion chambers form a center height of a transmission side cylinder positioned most to the transmission side among the plurality of cylinders is higher than center heights of usual cylinders including one cylinder other than the transmission side cylinder and a peripheral height at the transmission side cylinder lower than peripheral heights of usual cylinders.

To provide an internal combustion engine that can be manufactured at low cost and be downsized by simplifying its lubrication system in the crankcase. An engine 9 includes: a crankcase; a cylinder equipped with a cylinder bore; a crankshaft; a balancer mechanism for reducing vibration of the engine by power transmitted from the crankshaft; a breather chamber provided on a top surface of the crankcase and disposed behind the cylinder; and a lubrication system for supplying lubricating oil to the crankshaft and the balancer mechanism. The balancer mechanism includes a first balancer disposed at a position farther from the cylinder bore than an idler gear. The lubrication system includes a balancer lubricating-oil passage branching off from a main gallery and reaching the first balancer across the breather chamber in a plan view.

A device configured to attach to a motor vehicle transmission housing enclosing the motor vehicle transmission is disclosed. The device includes a cover having an upper surface and a lower surface. The lower surface includes at least a first chamber and a second chamber, such that, once said cover is installed onto the motor vehicle transmission housing, the first chamber is in fluid communication with a motor vehicle crankcase and a motor vehicle oil tank, and the second chamber is in fluid communication with the motor vehicle transmission. The device includes a vent extending through the upper surface and the lower surface so as to vent pressure within said first chamber to the outside of said first chamber.