Variable compression ratio engine with multi-link structure, variable compression ratio engine and automobile

Abstract

The application discloses a multi-connecting rod structure of a variable compression ratio engine, a variable compression ratio engine and a vehicle, which comprises an upper connecting rod, a rocker arm assembly, a crankshaft, a lower connecting rod, a control shaft, a driving assembly, a hydraulic cavity and an oil inlet and outlet control assembly; the driving assembly is connected with the control shaft and separates the hydraulic cavity into upper and lower hydraulic cavities, and can adjust the volumes of the upper and lower hydraulic cavities under the driving of the control shaft; the oil inlet and outlet control assembly is used for controlling the oil inlet and outlet states of the upper and lower hydraulic cavities. The driving assembly has a tendency to change the volumes of the upper and lower hydraulic cavities under the power from a piston, the driving assembly reduces the volume of a cavity in an oil outlet state, and the other cavity is in an oil inlet state; when the volume of the cavity in the oil outlet state becomes the smallest, the driving assembly cannot slide any more, the state of the control shaft is stable, reliable compression ratio switching is realized, an additional power source is not needed to drive and stabilize the control shaft, cost, space requirement and energy consumption are reduced, and the thermal efficiency of the engine is improved.

Images