FI122436B - Reciprocating internal combustion engine - Google Patents

Description

Reciprocating piston internal combustion engine

The invention relates to a piston internal combustion engine machine having at least one cylinder with a cylinder sleeve having a flame ring disposed on the combustion-space end of the cylinder sleeve.

Such a flame ring is subjected to a high thermal load. In that case, it will seek to forcibly expand. This expansion is prevented by the cooler cylinder sleeve that surrounds it. This results in tension in the flame ring. Under normal, uninterrupted operation of the internal combustion engine, the voltages are also within the thermally most demanding range of the 10 flame rings below the limit at which the plastic deformation of the ring occurs. However, in the extreme case, for example, overload of the internal combustion engine or irregular combustion, such as the knocking action of gas engines, the elongation limit of the flame ring material is exceeded and thus plastic deformations occur. These deformations 15 lead to unauthorized shrinkage of the flame ring.

With this in mind, it is an object of the invention to improve the flame ring of the system according to the preamble by simple and inexpensive means so that it can also withstand very high temperatures without the risk of malfunction.

This object is achieved in accordance with the invention by partially reducing the wall thickness of the flame-20 ring in thermally demanding areas to increase its elasticity.

This measure locally reduces the stiffness of the flame ring. This results in a reduction in tension in the flame ring, which effectively prevents plastic deformations.

25 The reduction in wall thickness is achieved in a simple structural and manufacturing manner by making grooves in the flame ring.

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^ A good voltage reduction is generally achieved by placing the troughs on the inner side of the flame ring. The notches thus preferably extend to the surface of the flame ring.

| Other preferred embodiments and appropriate further embodiments of the main procedures will be apparent from the other subclaims and

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§ description by drawing.

The sole figure of the drawing shows a perspective view of a portion of a flame ring and a sleeve of a cylinder.

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The drawing shows the cylinder sleeve 1 of a percussion internal combustion engine, such as a large gas engine, and the construction and operation of the percussion internal combustion engine are known per se and thus need not be further explained. Into the annular recess 5 at the top of the cylinder sleeve 1 is provided a flame ring 2. The inner side 7 of the flame ring 2 has notches 4 in the upper combustion side region 3 by partially reducing this wall thickness, namely the elasticity of the flame ring 2. The notches 4 in the exemplary embodiment run parallel to the axis of the cylinder sleeve 1. Alternatively, the notches 10 may also be disposed at an angle to the axis of the cylinder sleeve 1. Thus, the elasticity of the flame ring 2 can be increased. The notches 4 then extend to the surface 5 of the flame ring.

In the exemplary embodiment shown, the cross-sectional area of the notches 4 is substantially limited to a semicircular shape. This has proven to be an opt-15 target considering the voltages present. Hereby, the cross-sectional area up to the outlet end 6 remains the same. Depending on the expected thermal load on the flame ring, the cross-sectional area of the notches 4 may also expand to the surface of the flame ring 2.

In the case of flame-20 rings which are approximately uniformly thermally loaded, the notches are spaced evenly around it. If the flame ring is loaded unevenly around its circumference, the distance between the notches 4 in the most thermally loaded area is reduced. Alternatively or additionally, in this case, the depth a or the height b of the notches 4 may be increased. In all cases, the distribution of elasticity around the circumference follows the thermal load.

In the drawing, the curve x, which is used during thermal loading, i.e. temperature, is also plotted.

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The pressure of the surfaces of a conventional flame ring having a certain portion of the circumference. Other parts of the circumference may result in a deviating curve. The 30 ° x illustrates that a conventional flame ring partially contains | high surface pressures and thus stresses that may exceed the material's elongation limit.

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The curve y below shows the pressure of the surfaces of the flame ring according to the invention and the resulting voltages. By comparing both curves x and y, it appears that the critical high surface pressures according to the invention can be effectively reduced. Expected surface pressures or temperatures and their distribution around the flame ring having a constant wall thickness are thus the starting point for using the wall thickness reduction according to the invention.

As illustrated above, the invention is not limited to the illustrated embodiment embodiment, but provides a variety of interpretations of flame ring wall thickness reduction.

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Claims (7)

1. A piston-combustion engine machine having at least one cylinder-fitted cylinder (1) in which the cylinder sleeve (1) is positioned opposite a combustion chamber 5, a flame ring (2), characterized by the wall thickness of the flame ring (2) has been partially reduced in thermal very demanding areas to increase its elasticity, so that for partial reduction of the wall thickness, cuts (4) have been made in the flame ring (2), which are located on the inner sides (7) of the flame ring (2) and in a region (3) located in it. the upper part, wherein the cutters (4) extend all the way to the surface (5) of the flame ring (2) and the cutters (4) comprise a boundary substantially in the shape of a semicircle. 2. Piston combustion engine machine according to claim 1, characterized in that the blades (4) extend parallel to the axis of the cylinder sleeve (1). 3. Piston combustion engine engine according to claim 1, characterized in that the blades (4) are placed diagonally in relation to the cylinder sleeve (1). 4. Piston-combustion engine engine according to any of the preceding claims, characterized in that the cross-sectional area of the cutters (4) remains end to end (6) on the outlet side in the lower part thereof. 5. Piston combustion engine engine according to any of the preceding claims, characterized in that the blades (4) are evenly distributed on the perimeter of the flame ring (2). 6. Piston combustion engine machine according to any of claims 1 to 3, characterized in that in the circumferentially thermally unevenly loaded flame rings (2), the mutual distance of the blades (4) is reduced in the thermally more loaded areas. 7. Piston-combustion engine engine according to any one of claims 1, 3 or 6, characterized in that the cutting depth (a) and / or the cutting height (b) are enlarged in the circumferentially perpendicular to the flame rings (2). thermally more stressed areas. {M 00 o {M o o {M