Hole-shaped disturbance type inner cooling oil chamber structure of high-strengthened diesel engine and steel piston

By introducing a perforated turbulence structure and perforated plate turbulence components into the internal cooling oil chamber of a high-strength diesel engine steel piston, the problems of low thermal conductivity and high mass are solved, achieving piston weight reduction and thermal stress reduction, and improving thermal load bearing capacity and durability reliability.

CN122280730APending Publication Date: 2026-06-26KUNMING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KUNMING UNIV OF SCI & TECH
Filing Date
2026-03-20
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

High-strength diesel engine steel pistons have low thermal conductivity, which leads to heat accumulation in the crown, high thermal stress, and large piston mass. Existing internal cooling oil chamber designs cannot simultaneously achieve synergistic optimization of enhanced heat transfer performance and reduced piston mass while ensuring manufacturability, strength, and lifespan.

Method used

A perforated turbulence-inducing structure is installed in the internal cooling oil cavity. The perforated plate turbulence-inducing component guides flow separation and shear enhancement, thereby improving turbulence intensity and wall heat transfer coefficient. The perforated plate turbulence-inducing component is positioned and encapsulated through split forging and laser welding, which reduces thermal resistance and piston mass.

Benefits of technology

It significantly improves the convective heat transfer capacity of the internal cooling oil chamber, reduces the thermal stress of the crown, achieves piston lightweighting, enhances heat load bearing capacity and durability reliability, and meets the engineering requirements under high burst pressure and high heat load conditions.

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Abstract

This invention discloses a perforated turbulence-type internal cooling oil cavity structure and a steel piston for a high-strength diesel engine. It utilizes a perforated plate-type turbulence-type crown internal cooling oil cavity (3) with circumferentially arranged perforated plate-type turbulence-type components (4) on its outer wall. Flow holes (5) are uniformly opened on the perforated plate-type turbulence-type components (4). The perforated plate-type turbulence-type components (4), in conjunction with the flow holes (5), organize the oscillating oil flow, enhancing near-wall heat transfer and suppressing stagnant dead zones. Simultaneously, the flow holes (5) reduce weight, achieving a combination of improved heat transfer and lightweight design. The included angle of the perforated plate-type turbulence-type components (4) is 90°–150°, and it is at the same height as the first annular groove, directionally scouring the top surface and inner high-heat wall surface of the oil cavity. The minimum wall thickness between the oil cavity and the top, inner cavity, and inner annular surface of the first annular groove is ≥1.5 mm, ensuring strength and fatigue life. The structure can be manufactured by split forging, and the assembly of the turbulence components and the encapsulation of the internal cooling oil cavity are achieved through two laser welding processes. This significantly improves the heat transfer area and heat transfer coefficient, reduces the peak temperature and thermal stress, and achieves weight reduction.
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Citation Information

Patent Citations

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