Eccentric crack type variable-compression-ratio mechanism

Abstract

The invention belongs to the technical field of engines, and in particular relates to an eccentric crank type variable compression ratio mechanism. The invention is composed of crankshaft, connecting rod, connecting rod cover, locking pin, etc. The crankshaft is a combined crankshaft, consisting of a left crankshaft, a crankpin and a right crankshaft. The crankpin is a three-section eccentric stepped shaft structure, each section There is a ring of locking pin holes on the shaft, and oil passages are respectively provided on the left body of the crankshaft, the connecting rod and the right body of the crankshaft, which can pass high-pressure oil or low-pressure oil; when the oil passage is low-pressure oil, the locking pin a and locking pin b enter the locking pin hole a and locking pin hole b respectively, while the locking pin c is separated from the locking pin hole c, the compression ratio is constant at this time; when the oil passage is high pressure oil, the locking pin a and the locking pin b are separated from the locking pin hole a and the locking pin hole b respectively, and the locking pin c enters the locking pin hole c, and the compression ratio can be adjusted at this time; the present invention can realize the continuous adjustment of the compression ratio , flexible control; simple structure, convenient manufacture, high reliability, easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to an eccentric bell crank type variable compression ratio mechanism. Background technique [0002] The increasingly severe energy crisis and emission regulations make traditional engines face more and more severe challenges. The comprehensive improvement of power, economy and emission performance is a requirement and challenge for traditional engines. In order to solve the technical problem that traditional engines cannot meet the comprehensive requirements of high efficiency, energy saving, and low emissions at the same time, variable compression ratio technology has emerged as the times require. This technology can well improve the thermal efficiency, fuel economy, and emission characteristics of the engine. [0003] The compression ratio refers to the degree to which the engine mixture is compressed, expressed by the ratio of the total volume of the cylinder before ...

AI Technical Summary

Problems solved by technology

[0004] At present, the realization of the variable compression ratio technology of the engine mainly includes the improvement of the cylinder head, the piston and the combustion chamber, and the crankshaft and connecting rod assembly. The existing problems mainly include a large number of complicated changes to the cylinder head, which greatly increases the manufacturing cost. increase; the addition of a large number of complex mechanical components reduces reliability

In addition, problems such as mechanism wear, compression ratio conversion control accuracy, and mechanical energy loss are very difficult.

Images