Pressure ratio adjustable engine

Abstract

The invention discloses an engine with adjustable pressure ratio, which comprises at least one cylinder and a piston. The piston is connected to the crank through an upper and lower connecting rod. The upper end of the lower link is hinged by an eccentric pin on which one or two auxiliary drive wheels are fixed, and the center line of the eccentric pin is connected to the center line of the lower end of the upper link or the upper end of the lower link The center line of the center line is set eccentrically, one end of the swing rod is connected with the eccentric pin, the other end is directly hinged on the cylinder body and one or two driving wheels that can be controlled to rotate are arranged on the hinge shaft, so The driving wheel and the auxiliary driving wheel can be rotatably matched. The device of the invention can adjust the pressure ratio of the engine in real time, so as to ensure that the engine always works at a higher cycle thermal efficiency, greatly improves the fuel efficiency and has lower emission pollution.

Description

technical field [0001] The invention relates to an improvement of an internal combustion engine, in particular to an engine with adjustable pressure ratio. Background technique [0002] The traditional reciprocating piston internal combustion engine cannot adjust the pressure ratio due to the structural limitation of the crank connecting rod mechanism, which limits the improvement of its performance. With the advancement of technology, a piston-type internal combustion engine as reported in the patent (EP-0292603) has appeared, the structure of which is as follows figure 1 shown. Its characteristics are: the piston is connected with the crank by the upper and lower connecting rods, the end point of the outwardly extending section of the upper connecting rod at the hinge of the upper and lower connecting rods is hinged with a swing rod, and the other end of the swing rod is supported on the eccentric block of the engine block. . But its shortcomings are that, firstly, when...

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Problems solved by technology

But its shortcomings are firstly that when the eccentric block rotates, only the angle between the upper and lower connecting rods is changed, which has little effect on the piston position, and the pressure ratio change is too small; secondly, the dynamic performance of the engine is obvious when the eccentric block rotates. change, so the patent specification does not state any advantages and applications in this regard

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