Variable Compression Ratio Engine Length Variable Linkage

Abstract

The invention relates to a variable length variable connecting rod mechanism of a variable compression ratio engine, which comprises a connecting rod small end and a connecting rod large end, the upper end of the connecting rod small end is connected with the piston, and the lower end of the connecting rod large end is connected with the crankshaft; the characteristics are: A first adjustment block and a second adjustment block are arranged between the small end of the connecting rod and the large end of the connecting rod, and the upper ends of the first adjustment block and the second adjustment block are respectively connected to the small end of the connecting rod through the first connecting rod and the second connecting rod. The head is hinged, and the lower ends of the first adjusting block and the second adjusting block are respectively hinged with the connecting big head through the third connecting rod and the fourth connecting rod; an adjusting and locking mechanism is set between the first adjusting block and the second adjusting block , the adjustment and locking mechanism can drive the first adjustment block and the second adjustment block to move closer or farther away. The invention can meet the requirements of engines with different purposes on the compression ratio, and has the advantages of simple structure, convenient control, good reliability and low cost.

Description

technical field [0001] The invention relates to an engine crank connecting rod mechanism, in particular to a variable compression ratio engine length variable connecting rod mechanism, which belongs to the technical field of engines. Background technique [0002] Variable compression ratio (VCR) technology can be called the last revolution of engine variable technology, which has a great impact on engine performance, can greatly reduce engine fuel consumption and improve emission levels. For passenger car engines, using a large compression ratio at a small load and using a small compression ratio at a heavy load can reduce fuel consumption; reduce NO x and other harmful emission levels, thereby reducing the requirements for after-treatment devices and reducing costs. Variable compression ratio technology has more application value for natural gas and diesel dual-fuel engines. When using natural gas, use low compression ratio to reduce knocking and increase maximum power. W...

AI Technical Summary

Problems solved by technology

[0011] The eccentric scheme of the small head of the connecting rod in the prior art is difficult to arrange in space on the diesel engine (the gap between the small head of the connecting rod of the diesel engine and the piston is small), the diesel engine has a high burst pressure, and there are problems in structural strength and durability reliability

Existing patents are basically principles and cannot be transformed into products

The eccentric scheme of the big end of the connecting rod will increase the diameter of the big end of the connecting rod, and the layout space on the original engine is tight, and the versatility with the original engine is not strong

In addition, the big head of the connecting rod generally needs to be disassembled and installed on the connecting rod cover. The eccentric wheel needs to be split into two parts. After the split, the control difficulty increases, and the overall eccentric wheel cannot be installed on the crankshaft.

The structure of the multi-link mechanism is complex, and the stability is not good when the engine speed is high. The change of the original machine is relatively large, and an additional set of mechanisms is required.

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