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Piston and preparing method thereof

A piston and piston skirt technology, which is applied to the piston of high-power diesel engine and its preparation field, can solve the problems of piston weight, piston inertia increase, steel top falling off, piston failure, etc., achieve simple preparation method, reduce manufacturing cost, and avoid piston failure Effect

Pending Publication Date: 2020-09-01
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The piston steel tops of the above-mentioned structures are relatively thick (accounting for about 1 / 5 to 1 / 3 of the piston height), and the reliability of the bolt connection method is poor. During use, due to the different thermal expansion coefficients of steel and aluminum, it is easy to cause the bolt connection to fail, resulting in steel The top falls off; in addition, the relatively large weight of the piston will increase the inertia of the piston during movement, which will also lead to premature failure of the piston; in addition, this kind of piston has low heat transfer capability and relatively high manufacturing cost

Method used

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  • Piston and preparing method thereof

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Experimental program
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Effect test

Embodiment 1

[0035] Such as Figure 1 to Figure 7 As shown, the piston of the embodiment of the present invention includes a piston head 1 and a piston skirt 2 located below the piston head 1, wherein the piston head 1 is made of 38MnVS6 steel.

[0036] Such as figure 1 As shown, the top surface of the piston head 1 is recessed downwards to form a combustion chamber 13, and the bottom wall of the combustion chamber 13 has an upwardly extending protrusion 131 near the middle, so the longitudinal section of the combustion chamber 13 is basically ω-shaped. .

[0037] Such as figure 1 with Figure 4 As shown, the lower surface of the piston head 1 has a first convex portion 11, the first convex portion 11 is arranged on the position near the middle of the lower surface of the piston head 1, and extends downward, the lower end of the first convex portion 11 has Laterally protruding teeth 111, such as Figure 4 As shown, there are multiple tooth portions 111, and they are arranged on the ou...

Embodiment 2

[0049] This embodiment is the same as the piston structure and piston preparation method of the above-mentioned embodiment 1, and the only difference is that: 1) the piston head 1 is made of 42CrMo steel; 2) the specific parameters in the piston preparation method are different, specifically, in step S3 , the temperature of the aluminum alloy melt is stable at 755°C; the preheating temperature T in step S4 0 is 280°C, the preheating temperature T in step S5 1 The temperature is 500°C, the preheating time is 2 hours, in step S6, the pressurized pressure is 100 MPa, and the pressure is maintained for 180s.

Embodiment 3

[0051] This embodiment is the same as the piston structure and piston preparation method of the above-mentioned embodiment 1, the only difference is that the specific parameters in the piston preparation method are different, specifically, in step S3, the temperature of the aluminum alloy melt is stable at 760°C; Preheating temperature T in step S4 0 is 200°C, the preheating temperature T in step S5 1 The temperature is 520°C, the preheating time is 1.5h, in step S6, the pressurized pressure is 120MPa, and the pressure is maintained for 120s.

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Abstract

The invention relates to a piston and a preparing method thereof. The piston comprises a piston head and a piston skirt part located below the piston head, and is characterized in that a first convexpart and a first groove used for limiting up and down moving of the piston head and the piston skirt part is arranged between abut-joint faces of the piston head and the piston skirt part in a matchedmanner, the end of the first convex part is provided with a tooth part laterally extending outwards, position, corresponding to the tooth part, of the first groove is provided with a tooth groove matched with the tooth part, the piston head is mounted on the piston skirt part through limiting fit of the first convex part and the first groove, accordingly, connection of the piston head and the piston skirt part is more firm, the problem that in the prior art, bolt connection is adopted, and the piston fails can be solved, the preparing method of the piston is simple, and the manufacturing costis reduced.

Description

technical field [0001] The invention relates to a piston, in particular to a piston for a high-power diesel engine and a preparation method thereof. Background technique [0002] As one of the most critical parts of a high-power diesel engine, the piston has very harsh working conditions. High temperature, high pressure and high-speed reciprocating motion require the piston to have high strength, high wear resistance, high heat resistance, high fatigue performance and low thermal expansion, high heat conduction, Lightweight and other comprehensive performance requirements. [0003] At present, for high-power diesel engines, steel-top-aluminum-skirt combined pistons, the steel top is formed by forging process, the piston skirt is formed by casting or forging process, and the steel top and aluminum skirt are connected by bolts. For example, the Chinese utility model patent "An Automobile Piston with Long Service Life", whose patent number is CN201920206555.X (authorized annou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02F3/22F02F3/26F02F3/28
CPCF02F3/22F02F3/26F02F3/28
Inventor 彭银江朱鸿磊陈大辉洪晓露侯林冲朱秀荣张将刘永强李维杰
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH