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Internal combustion engine piston and production method for same

A manufacturing method and internal combustion engine technology, applied to pistons, manufacturing tools, cylindrical pistons, etc., can solve the problems of thicker alloy layers and lower joint strength, and achieve light weight, high durability, and high durability. Effect

Active Publication Date: 2019-12-27
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Conversely, when joining is performed under the condition that the inner side of the joint surface closer to the rotating shaft has higher joint strength, the alloy layer on the outer side becomes thicker and the joint strength decreases.

Method used

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  • Internal combustion engine piston and production method for same
  • Internal combustion engine piston and production method for same
  • Internal combustion engine piston and production method for same

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Embodiment

[0127] The present invention will be described more specifically with reference to examples.

[0128] By SCM435 to manufacture the above Figure 3A , Figure 3B Piston upper part 2 shown, and manufactured from A4032 aluminum alloy Figure 4A , Figure 4B Lower part 3 of the piston shown. Then, the piston lower part 3 was frictionally engaged with the piston upper part 2 to manufacture the piston 1 for an internal combustion engine. During this frictional engagement, the rotational speed during frictional heating, the pressing force during frictional heating, the pressing time during frictional heating, and the presence or absence of forced air cooling were varied, and the temperature of the outer peripheral surface of the lower piston 3 before upsetting was measured. For peripheral surface temperature, use a radiation thermometer such as Figure 7 As shown, a position P' at L2 = 2 mm from the joint surface toward the side of the piston lower part 3 was measured.

[0129]...

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Abstract

The invention provides an internal combustion engine piston and a production method for the same. This internal combustion engine piston comprises: a steel first member; and an aluminum alloy second member that is bonded to the first member via an annular bonding layer. The bonding layer is 1.0-20.0 [mu]m thick on both the inner circumferential side and the outer circumferential side thereof.

Description

technical field [0001] The present invention relates to a piston for an internal combustion engine and a manufacturing method thereof. [0002] this application claims priority based on Japanese Patent Application No. 2017-138445 for which it applied in Japan on July 14, 2017, and uses the content here. Background technique [0003] The combustion temperature and combustion pressure in the cylinder are gradually increasing as the output of automobile engines increases and the fuel consumption rate decreases. Among them, pistons for diesel engines are particularly required to have high-temperature durability. In addition, in order to reduce the power loss due to the inertial force when the piston moves up and down, it is also required to reduce the weight of the piston. Furthermore, the piston skirt and the cylinder thermally expand due to the temperature rise accompanying combustion, but in order to keep the gap between them constant, the thermal expansion coefficient of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02F3/00B23K20/12F16J1/01
CPCB23K20/12F16J1/01F02F3/003F02F2003/0061F02F3/0015F02F2200/00
Inventor 平上大辅山下朋广高须贺干
Owner NIPPON STEEL CORP