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Variable compression ratio mechanism and engine

A compression ratio, engine block technology, applied in machine/engine, engine control, mechanical equipment, etc., can solve problems such as wear, impact on mechanism reliability, and large loss of connecting rod wear and tear.

Active Publication Date: 2021-07-06
GREAT WALL MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing multi-link structure variable compression ratio mechanism, due to the large swing angle of the connecting rod, the wear loss of the connecting rod is relatively large, and the wear is serious, which will affect the reliability of the mechanism after a long time

Method used

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  • Variable compression ratio mechanism and engine
  • Variable compression ratio mechanism and engine
  • Variable compression ratio mechanism and engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment relates to a variable compression ratio mechanism, which is a multi-link variable compression ratio mechanism, and as figure 1 As shown in , the mechanism includes a piston 1 slidingly arranged in an engine block not shown in the figure, rotating a crankshaft 4 arranged in the engine block and an eccentric shaft 6 with an eccentric wheel 7, and rotating a crankshaft 4 arranged in the engine block The adjusting connecting rod 3 on the crank pin in the middle, and the execution connecting rod 2 and the driving connecting rod 5 that are hinged to both ends of the adjusting connecting rod 3 and are hingedly connected to the piston 1 and the eccentric wheel 7 respectively.

[0038] Wherein, the structure of the above-mentioned adjusting link 3 is further as figure 2 As shown in , it specifically includes an upper rod part 301 and a lower rod part 302 that are fixed together by a connecting piece 8. The structures of the upper rod part 301 and the lower rod p...

Embodiment 2

[0054] This embodiment relates to a variable compression ratio engine, which includes an engine block, and also includes a variable compression ratio mechanism as in Embodiment 1 arranged in the engine block. The engine of this embodiment adopts the variable compression ratio mechanism in the first embodiment, which can reduce the wear of the actuator connecting rod 2 and the driving connecting rod 5, and can improve the service life of the two connecting rod structures, thus having good practicability.

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PUM

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Abstract

The present invention provides a variable compression ratio mechanism, which includes sliding a piston disposed in the engine block, rotating a crankshaft disposed in the engine block and an eccentric shaft with an eccentric wheel, and rotating a crankpin disposed in the crankshaft the adjusting connecting rod, and the executing connecting rod and the driving connecting rod hinged at both ends of the adjusting connecting rod and respectively hinged with the piston and the eccentric wheel; The swing angle of the actuator link is set to be lower than 30°, and the swing angle of the drive link is set to be less than 27° with the eccentric wheel as the swing center. The variable compression ratio mechanism of the present invention can reduce the friction loss and reciprocating inertial force of the connecting rod by limiting the swing angle of the connecting rod during operation, thereby reducing the wear of the connecting rod.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a variable compression ratio mechanism, and also relates to a variable compression ratio engine with the variable compression ratio mechanism. Background technique [0002] At present, the engines used in automobiles are all fixed compression ratio engines, that is, the compression ratio of the engine will not change with the load. However, the determination of the compression ratio should be a compromise between power, economy and combustion. It should be neither too large nor too small. At low speed, small load or partial load, if the compression ratio is too small, the combustible mixture will Inadequate mixing will result in low combustion efficiency, high fuel consumption, and high emissions due to insufficient combustion. At high speed and heavy load, if the engine compression ratio is too high, it will easily cause knocking, which will affect the power output in the slight...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B75/04F02D15/02
CPCF02B75/04F02D15/02
Inventor 刘俊杰刘涛尹吉林文张树旻渠娜杨乐刘君宇董高峰孟金
Owner GREAT WALL MOTOR CO LTD
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