Abstract: A lubrication apparatus for an engine includes a crankshaft chamber, a camshaft chamber, and an oil reservoir chamber, wherein an oil-suction piping path is provided in the oil reservoir chamber, and is communicated between the crankshaft chamber and the oil reservoir chamber. The oil-suction piping path includes, among others, a rotatable pipe including a plurality of oil-suction orifices located at wall of the rotatable pipe. No matter the engine is situated at any state of declination, at least one of the oil-suction orifices and an air-suction vent is kept under the surface of the lubricant, so that the engine can be appropriately lubricated. Further, a one-way valve is arranged between the crankshaft chamber and the oil reservoir chamber, where most of the lubricant can flow back to the oil reservoir chamber during the descending stroke of a piston, so that a lubricant supply can be reduced.

Abstract: Disclosed is an intake swirl enhancing structure for internal combustion engine mainly including a guide shaft and several guide interfaces radially extending from the guide shaft to split a space into several intake passages. Each of the guide interfaces has a curved outer corner near an outlet end of the intake passages to swirl gas flowing through and out each intake passage, so that the gas enters a cylinder of the engine and forms a turbulent swirl in the cylinder. The intake swirl enhancing structure may be directly set in an intake manifold or an intake port for use without the need of modifying the existing engine design. Enhanced swirls produced by the intake swirl enhancing structure result in faster and steadier burning of mixture in the engine. When the structure is employed in the lean mixture burning, reduced fuel consumption and minimized environmental pollution can be achieved.