Piston for internal combustion engine

A technology for internal combustion engines and pistons, applied in the field of improving the cooling performance of pistons, to achieve low cost, simple structure, and the effect of suppressing temperature rise
CN1902392AInactive Publication Date: 2007-01-24KOMATSU LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KOMATSU LTD
Publication Date
2007-01-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

A piston (1), wherein the surface roughnesses of the rear surface (10a) of a combustion chamber (10) and the inner wall surface (11a) of a cooling cavity (11) are set to 6.3 S or less (portions a' and b' indicated by chain-double dashed lines), and these portions with the surface roughness of 6.3 S or less are surface-coated with the film of a self-purifying catalyst. Since oil is less accumulated in the surface-coated portions, the caulking of the oil can be suppressed to prevent the coefficient of heat transfer from being deteriorated so as to suppress the rise of temperature, and accordingly, the strength of the piston can be prevented from being lowered by the caulking. As a result, since an increase in the amount of a cooling oil and an increase in the capacity of an oil cooler due to an increase in the output of an engine can be eliminated, the piston (1, 30) for the internal combustion engine simple in structure and capable of easily coping with an increase in the output of the engine can be provided without causing an increase in installation space and cost.
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Description

technical field

[0001] The present invention relates to a piston for an internal combustion engine, and more particularly to a means for improving the cooling performance of a piston used in a high-speed, high-output diesel engine having a piston cooling device using engine oil. Background technique

[0002] Conventionally, as a piston cooling device in a high-output diesel engine, there is a piston cooling device for an internal combustion engine described in Patent Document 1, for example.

[0003] figure 1 It is a side sectional view showing the structure of a piston for an internal combustion engine and a piston cooling device described in Patent Document 1, figure 2 yes figure 1 X-direction view. and, figure 1 yes figure 2 The A-A direction view.

[0004] exist figure 1 , figure 2 Among them, the piston 1 as the first conventional example is a casting (for example, FCD: spheroidal graphite cast iron). A concave combustion chamber 10 opening upward is provide...

Claims

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