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Exhaust valve for diesel engine and production thereof
| Details |
Inventors: Yamada, Takemi; Satoh, Tamataro; Mizushina, Masaaki; Toyota, Koji; Okamoto, Hiromi;
Assignee: Nippon Kokan Kabushiki Kaisha (Tokyo, JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
This invention is concerned with an exhaust valve for Diesel engine and a method thereof, in which a seat of the exhaust valve is formed with coated layer comprising ceramics and metals, the layer becoming thicker in density of ceramics as coming nearly to the surface thereof. The seat may be formed with the coated layer by subjecting to pressing-heating treatment after coating. This kind of the exhaust valve is provided by coating ceramics and metals onto a seating portion of the mother material such that ceramics becomes thicker in density as advancing to the surface, and heating the coated layer in electric conductivity while pressing the layer with the tool in non oxidizing atmosphere. |
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DETAILED DESCRIPTION OF THE INVENTION Embodiments of the invention will be explained in referrence to the attached drawings.
FIG.
1 shows the exhaust valve according to the invention for Diesel engine, and the exhaust valve is composed of the valve body 1 and the valve seat 2.
FIG.
2 enlarges X portion in FIG.
1, and mutual contacting portions of the valve body 1 and the valve seat 2 are seat faces 11, 21.
The seat face is formed with the coated layer of metals and ceramics, and the ceramic density becomes thicker as advancing toward its surface.
FIGS.
3(a) and (b) show two examples of such coated layers, in which reference A is the coated layer, and B is the mother material of the valve body 1 or the valve seat 2.
In FIG.
3(a), the coated layer A has single structure and continuously changes the ceramic density in depth direction of the layer.
The coated layer A is almost ceramics 3 at the surface and almost metals 4 (chiefly alloy) at the deep part.
In FIG.
3(b), the coated layer has multi layered structure and changes the ceramic density per each of the layers.
The coated layer A is composed of A1 to A5 layers being different in the ceramic density.
The layer A5 as the uppermost layer is almost ceramics only, and the layer A1 as the lowest layer is almost metals only.
The middle layers A2 to A4 are complex of ceramics and metals, and the ceramic density is thicker as going toward the surface, that is, in the order of A2, A3, A4.
The coated layer of multi layered structure is optional in 2 layered structure or 3 layered structure.
If the layer were double, the upper would be ceramics or complex of ceramics and metals and the lower would be metals.
If the layer were triple, the upper would be ceramics, the middle would be ceramics-metals and the lower would be metals, otherwise the upper and the middle layers would be complex of ceramics and metals, and the lower would be metals.
In this regard, the present invention should not be limited to such embodiments.
It is sufficient that the seat is structured with the coated layer of ceramics and metals in such a manner that the ceramic density is thicker in the upper part and the metal density is thicker in the lower part
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Processing Data 
