US 2006/0065458 A1 · Engine configuration for a motorcycle

Abstract

A motorcycle is provided in which a seat and a storage box are arranged so as to be vertically stacked on each other in a rear portion of a body frame, and a pivotally mounted powertrain unit is suspended from the body frame under the storage box. The powertrain unit extends in the fore-and-aft direction of the body frame, and the engine has a crank chamber and a lubricant oil chamber provided separately from each other. A lubrication-oil passage structure for the engine is provided between each of a pair of journal bearing portions of a crankcase. The crankcase has an enclosed crank chamber and a crankshaft which is freely rotatably supported by the journal bearing portions with plain bearings. The journal bearing portions are provided with protrusion bosses for resisting entry of lubricating oil into the crank chamber from outside of the crankcase.

Claims20

Dependent claims

A motorcycle comprising a body frame, a seat mounted on the body frame, a rear wheel operatively connected to the body frame, and a storage box arranged substantially vertically below the seat in a rear portion of the body frame,

the motorcycle further comprising a powertrain unit suspended from the body frame so as to be positioned under the storage box, the powertrain unit comprising an engine and a transmission,
the engine comprising a cylinder arranged along a cylinder axial line which is oriented in a fore-and-aft direction of the body frame, the engine further having and a crank chamber and a lubricant oil chamber formed therein and provided separately from each other,
the transmission extending from a rear portion of the engine and operatively interconnecting the engine and the rear wheel,
wherein the powertrain unit extends in the fore-and-aft direction of the body frame.

1 more element

A motorcycle comprising a body frame, a seat mounted on the body frame, and a storage box arranged so as to be vertically stacked with respect to the seat in a rear portion of the body frame,

the motorcycle further comprising a rear wheel and a powertrain unit suspended from the body frame so as to be positioned under the storage box,
the powertrain unit comprising an engine and a transmission,
the engine being a dry sump engine and comprising a cylinder arranged along an axial line which is oriented in a fore-and-aft direction of the body frame, and a crankcase enclosing both a crank chamber and a lubricant oil chamber, wherein the crank chamber is provided separately from the lubricant oil chamber,
the transmission extending from a rear portion of the engine and operatively interconnecting the engine and the rear wheel,
wherein the lubricant oil chamber is disposed below and alongside of the crank chamber.

2 more elements

Dependencies are inferred from the claim text.

Engine configuration for a motorcycle

Life of this patent

Engine configuration for a motorcycle

Life of this patent

Abstract

Claims20