JP2505567Y2 - Material of ceramic vortex chamber - Google Patents

Description

TECHNICAL FIELD The present invention relates to a material for a ceramic vortex chamber used in a combustion chamber of a diesel engine.

2. Description of the Related Art As a material of a ceramic vortex chamber used in a conventional combustion chamber of a diesel engine, there is, for example, one shown in FIG. 3 (see Japanese Utility Model Publication No. 55-67317).

The material 1 of the ceramic vortex chamber has a substantially bell shape, and is used by being directly cast from an aluminum alloy or the like that constitutes the cylinder head 2.

The position of the ceramic vortex chamber material 1 is fixed by the core 3 during casting, and the core 3 is removed after casting to be machined into a combustion chamber shape indicated by a broken line in the figure.

In order to prevent the ceramic vortex chamber material 1 from falling off, the aluminum alloy of the cylinder head 2 wraps around to the opening end surface 1a of the ceramic vortex chamber material 1.

However, a cavity 5 is easily formed in a corner portion 4 formed by the end surface 1a of the opening and the outer surface 3a of the core 3.

This cavity 5 needs to be removed by machining,
Therefore, the inner diameter 2r of the ceramic vortex chamber material 1 is made sufficiently smaller than the diameter of the combustion chamber indicated by the broken line.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in such a conventional ceramic vortex chamber material 1, since the thickness to be removed by machining is large, it takes a very long time to cut the ceramic, There is also a problem that the cutting tool wears quickly.

The present invention has been made for the purpose of solving such conventional problems.

Means and Actions for Solving the Problems For this reason, the present invention has a bell shape, and the outer periphery including the end face of the opening is surrounded by the aluminum alloy forming the cylinder head, and the inner face is machined to form the combustion chamber. In a ceramic vortex chamber material processed into a shape, the diameter of the inner surface of the ceramic vortex chamber material excluding the vicinity of the opening,
The diameter was made larger than the diameter in the vicinity of the opening.

The cavities that are easily formed at the corners formed by the end surface of the opening of the ceramic vortex chamber material and the outer surface of the core are completely removed, and the amount of machining of the ceramic portion by machining is greatly reduced.

Embodiment Hereinafter, the present invention will be described with reference to the drawings. Figure 1
It is a figure which shows one Example of this invention.

First, the configuration will be described. The same components as those in FIG. 3 showing the conventional example are designated by the same reference numerals and the description thereof will be omitted.

The ceramic vortex chamber material 1 has an inner surface near the opening end surface 1a.
The inner diameter 2r of 6a is the same as the conventional one, but the diameter 2R of the inner surface 6b other than the vicinity of the opening is widened to an inner diameter slightly smaller than the combustion chamber shape shown by the broken line. Therefore, when machining the shape of the combustion chamber by machining, the cutting amount of the ceramic is greatly reduced.

The position of the ceramic vortex chamber material 1 is fixed by the core 3 during casting. At this time, a gap 7 exists between the core 3 and the ceramic vortex chamber material 1, but since the head 3a of the core 3 is in contact with the inner surface 6 of the ceramic vortex chamber material 1, the fixing is impeded. Done without.

FIG. 2 shows another embodiment. In this embodiment, the inner surface 6a near the opening end surface 1a extends in a substantially cylindrical shape and is connected to the inner surface 6b having an inner diameter slightly smaller than the combustion chamber shape shown by the dotted line.

Also in this embodiment, the cutting amount of ceramic is significantly reduced.

Since there is no gap between the ceramic vortex chamber material 1 and the core 3 during casting, the ceramic vortex chamber material 1 is reliably fixed by the core 3.

Effect It has a bell shape and is surrounded by the aluminum alloy that forms the cylinder head, including the end face of the opening.
In a ceramic vortex chamber material whose inner surface was machined into a combustion chamber shape, the diameter of the inner surface of the ceramic vortex chamber material excluding the vicinity of the opening was formed to be larger than the diameter near the opening. In the process of forming the combustion chamber shape by, the cutting amount of the ceramic portion can be greatly reduced.

Therefore, the time required for cutting can be greatly shortened, and the life of the cutting tool can be greatly extended.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing another embodiment of the present invention, and FIG. 3 is a sectional view showing a conventional example. 1 ... Ceramic vortex chamber material, 1a ... Opening end face, 2
…… Cylinder head, 3 …… Core, 5 …… Cavity, 6 ……
Inner surface of ceramic vortex chamber material, 6a …… Inner surface near the opening.

Claims (1)

(57) [Scope of utility model registration request] 1. A ceramic vortex chamber material having a substantially bell shape, the outer periphery including the end face of the opening thereof being surrounded by an aluminum alloy forming a cylinder head, and the inner surface being machined into a combustion chamber shape. A material for a ceramic vortex chamber characterized in that the diameter of the inner surface of the ceramic vortex chamber material excluding the vicinity of the opening is formed to be larger than the diameter near the opening.