Engine

摘要

The invention involves an engine that the cylinder block contains a coupled piston formed by a main piston (20), an external piston (30). The external piston (30) is sleeved outside of the main piston (20) and uses the rods (35) on the two sides to connect to the heart- shape groove on the two sides of the crankshaft (18) inside the crankcase (17) at the bottom of the cylinder block (10). It moves with the main piston (20) in an upward stroke and in a downward stroke. It forms a direct fuel injection device in the cylinder without carburetor. It does not need to add lubricants in the fuels. Besides, the engine has increased compression ratio. The engine provides enhanced economical benefits and meets today's environmental requirements. It achieves the goals of low pollution, high horse power, small volume, simple structure and durability. It is technical breakthrough in the development of internal combustion engine.