Variable compression-ratio reciprocating piston engine

Abstract

The utility model relates to an engine with a variable compression ratio, in particular to a reciprocating piston engine with a variable compression ratio; a connecting rod (2) is connected with a connecting rod axel neck (3) on the crank shaft through an eccentric upper bearing (9) and an eccentric lower bearing (10); a slide groove and a stepped hole communicated with the slide groove are machined on a crankshaft balance weight (7) arranged on the crankshaft; wherein, a centrifugal slide block (5) is mounted in the slide groove; the centrifugal slide block (5) is connected with the eccentriclower bearing (10) through a pull rod (4); the small diameter part of the stepped hole is mounted with an adjusting bolt (11); a locking nut (12) is mounted on the adjusting bolt (11); the large diameter part of the stepped hole is mounted with a return spring (8); both ends of the return spring (8) are respectively connected with the adjusting bolt (11) and the centrifugal slide block (5). The engine with a variable compression ratio has the advantages of simple structure and small volume; the variation of the piston stroke is realized through the rotation of the eccentric upper bearing andthe eccentric lower bearing arranged on the connecting rod axel neck of the crankshaft, so as to change the volume of the cylinder combustion chamber so that the compression ratio of the cylinder combustion chamber is changed.

Description

technical field [0001] The invention relates to an engine with variable compression ratio, in particular to a reciprocating piston engine with variable compression ratio. technical background [0002] The compression ratio of a reciprocating piston engine refers to the ratio of the volume of the cylinder above the top of the piston when the piston is at the bottom dead center to the volume of the combustion chamber when the piston is at the top dead center. The compression ratio is an important design parameter of the engine, and its size has an important impact on the combustion conditions and combustion thermal efficiency in the engine cylinder, and thus has an important impact on the performance of the engine. In general, an engine with a low compression ratio works softly, but its power is not strong and its fuel consumption is high; an engine with a high compression ratio has enhanced power and low fuel consumption. However, if the compression ratio is too high, it wil...

AI Technical Summary

Problems solved by technology

In general, an engine with a low compression ratio works softly, but its power is not strong and its fuel consumption is high; an engine with a high compression ratio has enhanced power and low fuel consumption

However, if the compression ratio is too high, it will easily cause knocking, which not only emits a sharp knocking sound, but also causes a decrease in power and an increase in fuel consumption, and reduces the life of the engine.

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