A top surface reinforced gas engine steel piston

Abstract

The utility model relates to a kind of top surface reinforced gas engine steel piston, belong to piston technical field.Steel piston includes piston main body, and the top surface of piston main body and combustion chamber surface are provided with composite reinforcing layer, and composite reinforcing layer includes reinforcing layer and contact layer sequentially from inside to outside.The utility model effectively improves the corrosion resistance, wear resistance, hydrogen embrittlement resistance and high-temperature impact resistance of piston top surface, meets the demand of piston top under various severe operating conditions, prolongs the service life of piston, reduces the economic loss caused by piston top corrosion.

Description

Technical Field

[0001] This utility model relates to a top-surface reinforced gas engine steel piston, belonging to the field of piston technology. Background Technology

[0002] While natural gas, methanol, and hydrogen fuels provide engines with excellent performance, they also bring many challenges. During application, these fuels can cause significant corrosion and wear on the piston crown of the engine. The reasons for this corrosion are as follows: 1. Hydrogen embrittlement occurs on the top surface of a steel piston in a hydrogen-containing environment, which reduces the ductility of the piston top material. This leads to a decrease in the strength, plasticity, and impact toughness of the piston top, resulting in delayed fracture of the piston top under stress.

[0003] 2. Under high temperature conditions, hydrogen reacts with carbides in steel to generate methane bubbles, which leads to a decrease in material strength and causes high-temperature hydrogen corrosion on the top of the steel piston.

[0004] 3. The combustion of natural gas, methanol, and hydrogen produces a large amount of water vapor. If this water vapor is not discharged in time, it will aggravate the corrosion of the piston inside the engine, thereby affecting the service life of the engine.

[0005] 4. Methanol itself has a certain corrosive effect. During methanol combustion, incomplete combustion produces small amounts of aldehydes, acids, and other corrosive organic substances. These can cause oxidation reactions on metal surfaces, generating corresponding oxides and salts. The formic acid produced can corrode engine pistons, and methanol can also accelerate the corrosion of iron.

[0006] Therefore, it is essential to strengthen the top surface of the steel piston. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a gas engine steel piston with a reinforced top surface, which effectively improves the corrosion resistance, wear resistance, hydrogen embrittlement resistance, and high-temperature impact resistance of the piston top surface, meeting the requirements of the piston top under various harsh working conditions, extending the service life of the piston, and reducing economic losses caused by piston top corrosion.

[0008] The technical solution of this utility model is as follows: A top-strengthened gas engine steel piston includes a piston body, and a composite reinforcing layer is provided on the top surface of the piston body and the combustion chamber surface. The composite reinforcing layer includes a reinforcing layer and a contact layer from the inside to the outside.

[0009] According to a preferred embodiment of this invention, the reinforcing layer is a heat-treated layer formed after nitriding the top surface of the piston body and the surface of the combustion chamber. This improves the surface's wear resistance, resistance to hydrogen embrittlement, and resistance to high-temperature impact.

[0010] According to a preferred embodiment of this invention, the contact layer is a nickel-phosphorus composite layer or a nickel layer. The contact layer is in direct contact with the fuel, and its corrosion resistance and high temperature resistance can be used to improve the overall performance.

[0011] The beneficial effects of this utility model are as follows: This invention utilizes a double-layer design with a composite reinforcing layer, which can effectively improve the corrosion resistance, wear resistance, hydrogen embrittlement resistance, and high-temperature impact resistance of the piston top surface, meeting the needs of the piston top under various harsh working conditions, extending the service life of the piston, and reducing economic losses caused by piston top corrosion. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the piston body structure of this utility model; The components are: 1. Piston body; 2. Combustion chamber; 3. Top surface. Detailed Implementation

[0013] The present invention will be further described below with reference to the embodiments and accompanying drawings, but is not limited thereto.

[0014] Example 1: This embodiment provides a top-reinforced gas engine steel piston, including a piston body 1. The top surface 3 of the piston body 1 and the surface of the combustion chamber 2 are provided with a composite reinforcing layer. The composite reinforcing layer includes a reinforcing layer and a contact layer from the inside to the outside.

[0015] The reinforcing layer is a heat-treated layer formed after nitriding the top surface of the piston body and the combustion chamber surface. It improves the surface's wear resistance, hydrogen embrittlement resistance, and high-temperature impact resistance.

[0016] The contact layer is made of nickel-phosphorus composite or nickel layer. The contact layer is in direct contact with the fuel, and its corrosion resistance and high temperature resistance can be used to improve the overall performance.

Claims

1. A gas engine steel piston with top surface reinforcement, characterized in that, It includes a piston body, and a composite reinforcing layer is provided on the top surface of the piston body and the surface of the combustion chamber. The composite reinforcing layer includes a strengthening layer and a contact layer from the inside to the outside.

2. The top-surface reinforced gas engine steel piston as described in claim 1, characterized in that, The reinforcing layer is a heat-treated layer formed after nitriding the top surface of the piston body and the surface of the combustion chamber.

3. The top-surface reinforced gas engine steel piston as described in claim 1, characterized in that, The contact layer is made of nickel-phosphorus composite or nickel.

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