Variable compression ratio device of automobile engine

Abstract

The invention discloses a variable compression ratio device of an automobile engine, comprising a crank shaft, a main connecting rod, a piston, an eccentric sleeve, a hinge bar transmission mechanism and a regulating shaft; a small end of the main connecting rod is connected with the piston by a piston pin, and a large end thereof is connected with the crank shaft; the eccentric sleeve is arranged between the small end of the main connecting rod and the piston pin, a connecting rod neck and the large end of the main connecting rod, or a main journal of the crank shaft and a main bearing saddle bore of a crank shaft case; the hinge bar transmission mechanism is used for the transmission between the regulating shaft and the eccentric sleeve. The hinge bar transmission mechanism controls the rotation of the eccentric sleeve, and can change the position of a dead point on the piston so as to change the compression ratio of the engine; furthermore, the hinge bar transmission mechanism is formed by two parallelogrammic hinged four-bar linkage mechanisms, so that the variable compression ratio device has the advantages of simple structure, easy fabrication, convenient control, reliable use, durability and low cost.

Description

technical field [0001] The invention relates to the technical field of automobile engines, in particular to a variable compression ratio device for automobile engines. Background technique [0002] Swedish SAAB (Shenbao) company first applied variable compression ratio technology to automobile engines. This technology can significantly improve the power performance of the engine, reduce fuel consumption and emissions, and increase the power per liter, which is conducive to engine miniaturization, especially in terms of energy saving and emission reduction. It has obvious advantages and is one of the core technologies of the next-generation automobile engine. At present, there are many variable compression ratio technical solutions. Although the effect of this technology on energy saving and emission reduction is very obvious, most of the variable compression ratio solutions further complicate the mechanical structure of the engine, greatly increase the cost, and reduce the r...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the shortcomings of the variable compression ratio engine, such as large changes to the engine, complicated mechanical structure, high cost, and low reliability, and provide a method that does not change the cylinder head, cylinder, piston, main connecting rod, etc. of the current mature engine. Under the premise of crankshaft and crankshaft support structure, the variable compression ratio device can be well combined with the current mature engine. The device is small in size and installed in the spare space of the crankcase, with low development cost and can adjust the engine compression ratio at Continuous change in the range between 7 and 16 or more, suitable for single cylinder, in-line multi-cylinder and V-type engines

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