求助此发动机机构的运动原理？

syea

the multiple-link type variable compression ratio engine mechanism
请教这个机构应该翻译成什么样的专业术语？是多连杆式的曲柄连杆机构下的VCR装置的意思吗？运动原理是怎么样的？

发动机制造

上面不是有可变压缩比的？
但这个机构怎么实现可变压缩比，那要根据具体的图纸或说明了？

zjw139

我想应该是连杆能跟据油压不同的情况下可以缩短和加长自由调节,这样同样的曲轴升程的情况下,因连杆的变长而压缩比上升,或变短而压缩比下降.

heiman

This paper presents a variable compression ratio (VCR) system that has a new piston-crankshaft mechanism with multiple links. This multi-link mechanism varies the piston position at top dead center (TDC), making it possible to change the compression ratio of the engine continuously. Previous attempts have been made to achieve variable compression ratio with this type of method, but it was difficult to avoid various undesirable effects such as an increase in the engine size, substantial weight increases, increased engine block vibration due to a worsening of piston acceleration characteristics and increased friction resulting from a larger number of sliding parts. At the stage of developing the basic design of the multi-link geometry, emphasis was placed on selection of a suitable link geometry and optimization of the detailed dimensions with the aim of essentially resolving these previous issues. As a result of the studies conducted at that stage, a VCR link geometry was found that optimally resolves these various issues. Besides achieving the desired VCR capability, this VCR system also provides several new and additional benefits including:

(1) a reduction of second-order vibration by making the piston stroke resemble simple harmonic motion (similar to second-order balancer function);

(2) lower piston friction loss as a result of reducing the piston-side thrust load in the expansion stroke; and

(3) a compact package that can be housed in the crankcase of existing engines.

The basic characteristics of a prototype VCR engine that incorporates these new benefits are described on the basis of a theoretical analysis and experimental results obtained in tests conducted with the prototype engine.

jackie张

多连杆式可变压缩比发动机

黄石崖

原帖由 jackie张 于 19-4-2009 20:47 发表
多连杆式可变压缩比发动机

强人!在变压缩比方面的专家.

zhangzj

原帖由 jackie张 于 19-4-2009 20:47 发表
多连杆式可变压缩比发动机

装置

chilly86

日本丰田拥有类似的技术，其他的VCR技术多为通过偏心来实现的。