JPS59206653A - Piston for vertical shaft type internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent lubricant from passing through into the combustion chamber by making a recess not communicating with the lower end at the outercircumference of piston land but communicating through a notch with a ring groove in the outercircumference of a vertical shaft type internal-combustion engine thereby communicating between the recess and the rear face of piston through a through-hole. CONSTITUTION:A recess 11 is formed around a piston pin boss section 10 on the outercircumference of piston of a vertical shaft type internal-combustion engine which is not communicated with the lower end 12A of a piston land section 12 to make the lower end continuous. Said recess 11 is communicated through a grooved notch 14 with an oil ring groove 13 while the recess 11 and the rear face 15 of piston are communicated through two through-holes 16 to communicate between the oil ring groove 13 and the rear face 15 of piston through many pin holes 17.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a vine piston that controls lubricating oil that accumulates inside a cylinder in an internal combustion engine in which the crankshaft is vertically disposed.

As in the internal combustion engine for an outboard motor shown in FIG.
In a vertical shaft internal combustion engine in which the
Connecting rod 4 connects the inside of cylinder liner 5 provided in horizontally placed cylinder block 1 to crankshaft B.
The piston 2, which is connected in an M manner through the piston, is configured to reciprocate in the horizontal direction.

On the other hand, the lubricating oil passes through the perforations 7 and 8 provided in the crankshaft B and lubricates each bearing part of the crankshaft 6, so the lubricating oil that comes out from the gap between the lubricating parts is shown by the arrow. As a result, more and more particles accumulate in the area indicated by the arrow X inside the cylinder liner 5, which is provided horizontally as described above.

Therefore, the lubricating oil in the cylinder liner 5 passes through the gap between the piston 2, the piston ring 6, etc., and passes to the combustion chamber 9 side, resulting in a significant increase in lubricating oil consumption. In an internal combustion engine in which the lubricating oil is vertically arranged, control of this lubricating oil is a critical issue. In addition, in order to reduce lubricating oil consumption compared to the past,
4494 and Utility Model Publication No. 55-37709, it has been proposed that four parts are provided on the outer periphery of the piston corresponding to the axial direction of the piston pin, but in the case of an internal combustion engine in which the crankshaft is arranged vertically, Furthermore, lubricating oil consumption is large.

Therefore, the present invention solves the above-mentioned conventional problems and prevents the lubricating oil that accumulates inside the cylinder liner of an internal combustion engine in which the crankshaft is arranged vertically from passing through to the combustion chamber side, thereby reducing the amount of lubricating oil consumed. It was made for the purpose of measurement.

That is, the present invention provides a screw I/n for a vertical axis type internal combustion engine that has a groove around at least one piston boss portion on the outer circumferential surface of the piston, which is not continuous with the lower outer circumference f15 of the piston land portion, and is formed with an oil ring groove. is constructed by providing a recess that communicates with the notch, and also providing one or more through holes that penetrate the recess and the back surface of the piston, and one or more 1'1 through holes that penetrate the oil ring groove and the back surface of the piston. .

An embodiment of the present invention will be described below with reference to the drawings. Fig. 2 is a side view of the piston in the embodiment of the present invention, and Fig.
The figure is a sectional view taken along the line AA in FIG. 2.

First, this piston 2 is applied to the conventional vertical axis type internal combustion engine shown in FIG.
Four parts 11 are provided that are recessed from the outer circumferential surface of the piston, and these four parts 11 are not continuous with the lower end 12A of the piston land 12, so the lower end 1 of the piston land 12 is
2A is formed so as to be connected all around.

Further, the four parts 11 communicate with the oil ring groove 16 through a group-shaped notch 14.

Further, these four parts 11 and the piston back surface 15 shown in FIG. 3 are penetrated by two through holes 16 each, and both the oil ring groove 13 and the piston back surface 15 are penetrated by through holes 17 formed by a large number of drilled holes. . In addition, the above four parts 1
1 may be provided only on the piston pin boss portion 10 side located on the lower surface of the assembly R of the piston 2.

In the piston 2 of the present invention having the above configuration, when lubricating oil accumulates in the part indicated by the arrow X of the cylinder liner 5 as in the conventional example shown in FIG. 12, the function of writing lubricating oil onto the crankshaft 6 side is achieved, and a large amount of lubricating oil passes through the gap on the outer circumference of the piston and enters the oil ring groove 16.
Even if the oil ring is guided to the groove 13, it is guided to the recess 11 via the notch 14, and from the through hole 16 to the back surface 15 of the piston.
At the same time, the lubricating oil cut by the oil cutter at the upper part of the oil ring groove 13 is released to the back surface 15 of the piston through the through hole 17 provided in the oil ring groove 16, and the lubricating oil is released into the combustion chamber 9. This can prevent it from passing to the side.

Therefore, in an internal combustion engine to which the piston of the present invention is applied and the crank 11ζ is arranged vertically, it is possible to prevent the lubricating oil accumulated inside the cylinder liner from passing through to the combustion chamber side, thereby reducing the amount of lubricating oil consumed. This has the effect of making it possible.

Furthermore, the piston of the present invention can be easily applied to conventional vertical axis internal combustion engines that are already in use.

[Brief explanation of drawings]

Figure 1 is a side cross-sectional view of the main parts of a conventional vertical axis internal combustion engine;
The figure is a side view of a piston in an embodiment of the present invention, and FIG. 3 is a sectional view taken along the line A--A in FIG. 2. 2... Piston, 3... Crankshaft, 5... Cylinder liner, 10... Piston pin boss portion, 11... Recessed portion, 12... Piston land portion, 12A... Lower end,
13... Oil ring groove, 14... Notch, 1
5... Back side of piston, 16', 17... Through hole. Agent: Patent Attorney Makoto Ogawa − Patent Attorney: Ken Noguchi Patent Attorney: Kazuhiko Saishita

Claims (1)

[Claims] In a piston of an internal combustion engine in which the crankshaft is arranged vertically, the circumference of at least one piston pin boss portion on the outer circumferential surface of the piston is not continuous with the lower end of the outer circumference of the piston land portion, and is separated from the oil link 14 by a notch. A vertical shaft type internal combustion engine characterized in that four communicating parts are provided, and at least one through hole passing through the recess and the back surface of the piston and one or more through holes passing through the oil ring groove and the back surface of the piston are provided. piston.