Light-weight engine cylinder sleeve of passenger vehicle and production method of light-weight engine cylinder sleeve

Abstract

The invention belongs to a light-weight engine cylinder sleeve of a passenger vehicle and a production method of the light-weight engine cylinder sleeve. Black spots are distributed on the outer circular surface of the cylinder sleeve, wherein the shapes of the black spots comprise a dumbbell shape, a positive frustum shape, a worm shape and an olecranon shape; the black spots in the four shapes are randomly distributed on the outer circular surface of the cylinder sleeve; the black spots are 0.25-1.1mm in height. The black points of the cylinder sleeve are only 0.25-1.1mm; the blank cooling speed in the centrifugal casting process of the cylinder sleeve is obviously reduced, thereby obviously improving a metallographic structure, improving the friction resistance of the cylinder sleeve and prolonging the service life of the cylinder sleeve; meanwhile, the black spots are small in height fluctuation, so that the roundness fluctuation in the process of casting an aluminum cylinder body is remarkable reduced; the possibility that engine oil sneaks into a combustion chamber is reduced; the tail gas emission of the combustion chamber is reduced; by the low-height black spots and the excellent metallographic structure, the wall thickness of the cylinder sleeve is reduced by 1mm; the cylinder center distance of the engine cylinder sleeve is reduced by over 2mm.

Description

technical field [0001] The invention belongs to the field of passenger car engines, and in particular relates to a lightweight engine cylinder liner for passenger cars and a preparation method thereof. Background technique [0002] Smog weather has been affecting many areas in China. The main reason for the formation of smog is the excessive emission of unburned particulate matter, of which vehicle exhaust emissions account for more than 50% of the total emissions. In order to reduce fuel consumption and exhaust emissions, the automobile industry began to reduce the weight of the vehicle through various methods. In this context, the all-aluminum automobile engine emerges at the historic moment, and it becomes the main way to reduce automobile weight and reduce exhaust emissions. [0003] Although the all-aluminum engine has good energy-saving and environmental protection effects, the key core technologies such as the hardness, tensile strength and wear resistance of the alu...

AI Technical Summary

Problems solved by technology

The relatively high protrusion on the outer surface causes the cylinder liner blank to cool too quickly during the centrifugal casting process of the cylinder liner, resulting in significant deterioration of the graphite structure and metallographic structure, forming a large amount of E-type graphite and supercooled structure, reducing the wear resistance and contact with the cylinder liner. Compatibility of piston rings

At the same time, the relatively high protrusion height fluctuates greatly, resulting in relatively large fluctuations in roundness during the aluminum cylinder casting process, resulting in relatively large fluctuations in exhaust emissions

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