Vermicular graphite cast iron piston rings for internal combustion engines

A technology of compacted graphite cast iron and piston rings, which is applied in the field of compacted graphite cast iron piston rings for internal combustion engines, can solve problems such as uneven contact surface wear, achieve the effects of solving uneven wear, improving overall performance, and reducing scrap rate

Active Publication Date: 2018-02-23
桃源县永峰机械有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems mentioned above, to provide a vermicular graphite cast iron piston ring for an internal combustion engine, so that the piston ring can maintain the effect of preventing sticking for a long time at high temperature, and solve the problem of wear on the contact surface of the inner peripheral surface of the cylinder. At the same time, by changing the alloy elements of the piston ring and optimizing the manufacturing process, the comprehensive performance of the piston ring itself can be improved to make the piston ring more durable

Method used

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  • Vermicular graphite cast iron piston rings for internal combustion engines
  • Vermicular graphite cast iron piston rings for internal combustion engines
  • Vermicular graphite cast iron piston rings for internal combustion engines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 As shown, a vermicular graphite cast iron piston ring for an internal combustion engine includes a piston ring body 1, the upper surface, the lower surface of the piston ring body 1 and the side facing the piston ring groove are covered with a layer of anti-adhesive film 2, the piston ring body 1 and A wear-resistant layer 3 is provided on the side in contact with the cylinder. The anti-adhesive film 2 includes a first film and a second film. The first film covers the second film, and the second film covers the piston ring body. 1, the wear-resistant layer 3 extends along the side of the piston ring body 1 in contact with the cylinder 5 to form a first tongue and a second tongue, the outer peripheral surface of the first tongue forms a bulging cylinder shape, And an opening is formed on the side of the piston ring body 1 in contact with the cylinder, the outer peripheral surface of the second tongue is formed in a bulging cylindrical shape, and an openi...

Embodiment 2

[0045] This embodiment is the same as Embodiment 1, except that the compacted graphite cast iron is composed of the following components by weight percentage: 3.4% carbon, 2.1% silicon, 0.3% molybdenum, 0.3% manganese, niobium 0.2% of chromium, 0.01% of tin, 0.01% of antimony, 0.1% of vanadium, 0.25% of titanium, the total content of phosphorus and sulfur is not more than 0.06%, and the balance is iron and its unavoidable impurities , the preparation method of described vermicular graphite cast iron comprises the following steps:

[0046] Step 1. Raw material preparation and molten iron smelting. When molten iron is smelted, put the raw material iron into the converter to heat and melt. Add decarburizer, desulfurizer and deoxidizer to the pool to decarburize, desulfurize and deoxidize the molten iron in the pool;

[0047] Step 2. After the decarburization, desulfurization and deoxidation processes are completed, the temperature of the molten pool is raised to 1440°C, and then f...

Embodiment 3

[0056] This embodiment is the same as embodiment one and embodiment two, and its difference is that described vermicular graphite cast iron is made up of following composition by weight percentage: carbon is 3.8%, silicon is 2.6%, molybdenum is 0.1%, manganese is 0.2%, niobium 0.3%, chromium 0.1%, tin 0.03%, antimony 0.28%, vanadium 0.18%, titanium 0.15%, the total content of phosphorus and sulfur does not exceed 0.06%, and the balance is iron and its Unavoidable impurities, the preparation method of the compacted graphite cast iron comprises the following steps:

[0057] Step 1. Raw material preparation and molten iron smelting. When molten iron is smelted, put the raw material iron into the converter to heat and melt. Add decarburizer, desulfurizer and deoxidizer to the pool to decarburize, desulfurize and deoxidize the molten iron in the pool;

[0058] Step 2. After the decarburization, desulfurization and deoxidation processes are completed, the temperature of the molten ...

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Abstract

The invention discloses a vermicular graphite cast iron piston ring for an internal combustion engine. The vermicular graphite cast iron piston ring comprises a piston ring body, wherein anti-adherent films cover the upper surface, the lower surface, and one surface, facing a position ring groove, of the piston ring body; an abrasion-resistant layer is arranged on the other surface, in contact with a cylinder, of the piston ring body; the abrasion-resistant layer extends along the other surface, in contact with the cylinder, of the piston ring body, to form a first tongue part and a second tongue part; a bulged circular barrel shape is formed on the outer circumferential surface of the first tongue part, and an opening part is formed in the other surface, in contact with the cylinder, of the piston ring body; a bulged circular barrel shape is formed on the outer circumferential surface of the second tongue part, and an opening part is formed in the other surface, in contact with the cylinder, of the piston ring body. The piston ring can remain the adhering preventing effect for a long term under high temperature, so that the problem of non-uniform abrasion of the contact surface of the inner circumferential surface of the cylinder can be solved, and as a result, the comprehensive performance of the piston ring body can be improved, and the piston ring is durable.

Description

technical field [0001] The invention relates to the field of internal combustion engine components, in particular to a vermicular graphite cast iron piston ring for an internal combustion engine. Background technique [0002] In recent years, the piston rings used in these engines have been required to be small in width, light in weight, low in tension, and low in friction loss in response to market demands for extending the life of automotive engines and improving fuel efficiency. Here, piston rings are installed on the pistons for smooth reciprocating motion of the pistons in the cylinders and for sealing high-temperature combustion gases. The piston on which the piston ring is attached forms a combustion chamber in the cylinder, and the explosion pressure generated by the combustion of fuel in the combustion chamber is converted into the rotation of the crankshaft. Therefore, the piston ring attached to the piston is required to have the function of being able to withsta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02F5/00
CPCF02F5/00
Inventor 李娟
Owner 桃源县永峰机械有限责任公司
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