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A variable compression ratio piston and a variable compression ratio engine

A technology with variable compression ratio, applied in the direction of engine control, engine components, machine/engine, etc., can solve the problems of increasing engine volume, high manufacturing cost, difficult mass production, etc., to avoid knocking, compact structure, structure simple effect

Active Publication Date: 2020-05-08
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its structure is relatively complex, the manufacturing cost is high, it is difficult to mass-produce, and at the same time it will increase the volume of the engine, so it is necessary to improve the existing variable compression ratio technology

Method used

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  • A variable compression ratio piston and a variable compression ratio engine
  • A variable compression ratio piston and a variable compression ratio engine
  • A variable compression ratio piston and a variable compression ratio engine

Examples

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] see Figure 1 to Figure 4 The described variable compression ratio piston is characterized in that it includes an inner piston 4 connected to the small end of the connecting rod 1 through a piston pin 2, an outer piston 5 threadedly engaged with the inner piston 4, and used for driving The drive mechanism 6 for moving the outer piston 5 up and down relative to the inner piston 4 . Through the driving mechanism 6, the outer piston 5 can move up and down relative to the inner piston 4, thereby changing the volume of the combustion chamber, realizing the change of the compression ratio, enabling the fuel to be fully burned, avoiding knocking, improving the thermal efficiency of the engine, and reducing fuel consumption and emissions.

[0026] The drive mechanism 6 includes a drive motor 61 fixed at the end of the cylinder block 3, a drive gear 63...

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PUM

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Abstract

The invention relates to a compression-ratio-variable piston and a compression-ratio-variable engine. The compression-ratio-variable piston comprises an inner piston connected with the small head endof a connecting rod through a piston pin, an outer piston in threaded fit with the inner piston, and a driving mechanism for driving the outer piston to move up and down relative to the inner piston.According to the compression-ratio-variable piston, the volumes of combustion chambers can be changed, compression ratio change is achieved, fuel can be fully combusted, detonation is avoided, the heat efficiency of the engine is improved, and fuel consumption and emissions are lowered; and the volumes of all the combustion chambers in the engine can be controlled only through a driving motor, thestructure is simple and compact, assembly is convenient, connecting is reliable, and the size of the engine is not increased.

Description

technical field [0001] The invention relates to an automobile engine, in particular to a variable compression ratio piston and a variable compression ratio engine. Background technique [0002] The engine compression ratio refers to the ratio of the cylinder volume when the piston moves to the bottom dead center to the cylinder volume when the piston moves to the top dead center. At present, the compression ratio of all mass-produced engines on the market is fixed. At low speed or partial load, the intake charge is small, and the actual compression ratio is lower than the designed compression ratio, which cannot fully atomize and burn the fuel; at high speed And under full load, the amount of air in the cylinder is greater than the volume in the cylinder, and the actual compression ratio is higher than the designed compression ratio. At this time, knocking and early combustion are prone to occur, which reduces the power output and increases the damage to the engine. The var...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D15/04F02F3/00
CPCF02D15/04F02F3/0023
Inventor 肖祥林翰徐丽茹伍建撰肖欣
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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