Scientists at Donetsk National Technical University have patented a connecting rod-free internal combustion piston engine with a variable compression ratio. The development allows for a reduction in engine size and weight.
The design is based on a crank-rocker mechanism. A rod connected to the piston is linked to a rocker, which transmits force to the crankshafts via sliders. The compression ratio change mechanism is located in the cylinder under the piston and is made in the form of a telescopic structure of two pistons with variable volume oil chambers. By transferring oil from one chamber to another through a system of valves and hydraulic locks, the compression ratio can be changed. Control is automatic – via a control unit based on pressure sensor signals.
The technical result is a reduction in the overall dimensions and weight of the engine. Such a solution is particularly useful for automotive engines, where a combination of power and efficiency is required in various operating modes – from city traffic jams to highway speeds. The ability to automatically change the compression ratio allows for optimizing fuel combustion, reducing consumption and emissions. The development may also be promising for light aviation, shipbuilding, and stationary power plants, where compactness and efficiency of the power unit are important.
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