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Variable-compression-ratio mechanism of engine

A compression ratio and engine technology, applied in engine control, machine/engine, mechanical equipment, etc., can solve the problems of complex crankshaft or connecting rod structure and reduced reliability, and achieve the effect of ensuring safe operation and changing the compression ratio.

Inactive Publication Date: 2013-02-20
GREAT WALL MOTOR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of engine can change the upward movement stroke of the piston in the combustion chamber of the cylinder by adding a variable device on the crankshaft or connecting rod, so that the compression ratio of the engine can be changed as required, but this will cause the crankshaft or connecting rod to be damaged. The structure is relatively complex, and because the crankshaft and connecting rod are subjected to a huge impact force during work, the reliability will be significantly reduced with the complexity of its structure

Method used

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Embodiment Construction

[0014] Such as figure 1 and figure 2 As shown, the engine variable compression ratio mechanism of the present invention includes a cylinder head 1 of the engine, and a hydraulic cylinder 2 communicating with the combustion chamber of the cylinder is arranged on the cylinder head 1. The hydraulic cylinder 2 is located between the engine intake valve 14 and the exhaust valve The space between the valves 15. A variable pressure piston 3 is arranged inside the hydraulic cylinder 2. Driven by the hydraulic device, the variable pressure piston 3 can slide up and down in the hydraulic cylinder 2, thereby changing the volume of the communication part between the hydraulic cylinder 2 and the combustion chamber. Because of being able to change the total volume of the combustion chamber.

[0015] The hydraulic device includes an oil storage tank 4, a high-pressure oil pipe 5, and a high-pressure oil pump 6 that supplies the hydraulic oil in the oil storage tank 4 to the high-pressure ...

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Abstract

The invention relates to an engine assembly, and in particular relates to a variable-compression-ratio mechanism of an engine. The variable-compression-ratio mechanism comprises a cylinder cover, wherein a hydraulic cylinder communicated with a combustion chamber of the cylinder is arranged on the cylinder cover; and a variable-pressure piston which can slide in the hydraulic cylinder under drive of a hydraulic device is arranged in the hydraulic cylinder. The variable-pressure piston is driven to move in the hydraulic cylinder through the hydraulic device, and the volume of a part at which the hydraulic cylinder is communicated with the combustion chamber can be changed, so that the total size of the combustion chamber is changed, the aim of changing the compression ratio of the engine is fulfilled, and the structures of a crankshaft and a connecting rod are not required to be changed.

Description

technical field [0001] The invention relates to an engine assembly, in particular to an engine variable compression ratio mechanism. Background technique [0002] In order to improve the working efficiency of the engine under various road conditions and reduce the emission of pollutants, there are now engines that can change the compression ratio. This kind of engine can change the upward movement stroke of the piston in the combustion chamber of the cylinder by adding a variable device on the crankshaft or connecting rod, so that the compression ratio of the engine can be changed as required, but this will cause the crankshaft or connecting rod to be damaged. The structure is relatively complicated, and because the crankshaft and connecting rod are subjected to huge impact force during work, the reliability will be significantly reduced with the complexity of its structure. Contents of the invention [0003] In order to solve the deficiencies in the prior art, the inven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D15/02
Inventor 刘吉春高定伟于文斌
Owner GREAT WALL MOTOR CO LTD
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