JPS59158358A - Piston ring of internal-combustion engine - Google Patents

Abstract

PURPOSE:To force a piston ring to be brought in resilient contact with a ring groove so as to reduce a leak of gas, by forming an almost central part section in one of the first and the second ring plates, which constitute the piston ring securing their one end to be welded, in a bowed shape in the direction so as to be detached from the other ring plate. CONSTITUTION:A piston ring 10, comprising the first ring plate 11 and the second ring plate 13 in almost the same dimensions, secures a peripheral part 13 of the first ring plate 11 to a peripheral part 14 of the second ring plate 12 by beam welding. Arranging the rest parts of the first ring plate 11 and the second ring plate 12 to be oppositely faced to each other with a slight distance, the second ring plate 12 is formed to a flat plate while the first ring plate 11 has a sectional shape in which an almost central part 16 between the peripheral part 13 of said plate 11 and its internal peripheral part 15 is curved in a bowed shape in the direction so as to be detached from the second ring plate 12.

Description

[Detailed description of the invention] The present invention relates to improvements in piston rings for internal combustion engines.

Conventional internal combustion engine piston rings, especially compression rings (
As shown in FIG. 1, the piston ring (hereinafter simply referred to as a piston ring) has a rectangular cross-sectional shape, and the piston ring 1 is attached to a ring groove of a piston. For example, now 7.

When the engine is in the expansion stroke, the piston ring 1 is pressed against the upper wall 4 of the ring groove 3 and the cylinder liner 5 by the gas pressure in the combustion chamber (not shown), as shown in FIG. , an upper wall 6 of the piston ring 1 and the ring groove 3, and a back wall 7 of the piston ring 1 and the ring groove 3.
There is a slight gap 9, 10 between them. On the other hand,
As shown in FIG. 3, the piston ring 1 has a f
Since the abutment gap 8 is provided, the gas in the combustion chamber (not shown) flows into the gap between the piston 2 and the cylinder liner 5 in the direction of arrow A, and the gaps 9 and 10 are moved in the direction of arrow B, respectively. , C, it flowed to the abutment gap 8, and leaked from the abutment gap 8 into the crankcase as shown by the arrow □□□). For this reason, in the past, there was inevitably a loss of engine output due to this gas leakage. As a countermeasure to this problem, the gap 8 between the two joints has been made as small as possible to reduce gas leakage and engine exit loss as much as possible, but this has not always been sufficient.

An object of the present invention is to reduce gas leakage in the combustion chamber by ensuring that the piston ring is always in elastic contact with the upper wall of the ring groove of the piston, thereby reducing engine output due to gas leakage. An object of the present invention is to provide a piston ring for an internal combustion engine that prevents the above.

According to the specific invention of the present application, this object consists of a first ring plate and a second ring plate having approximately the same dimensions, and
The outer periphery of each of the ring plate and the second ring plate,
Alternatively, any one of the inner circumferential portions of each may be fixed to each other by welding, and the remaining portion may have a small amount of rII.
The first ring plate and the second ring plate face each other with a J gap.
An internal combustion engine characterized in that at least one of the ring plates has a cross-sectional shape in which a substantially central portion between the outer circumference and the inner circumference is bent in a direction away from the remaining ring plates. Achieved by piston rings.

According to the first combined invention of the present application, the object is to provide a piston ring with a U-shaped cross section that opens outward in the radial direction. The first ring plate and the second ring plate have approximately the same dimensions, and at least one of the first ring plate and the second ring plate has a gap between its outer circumference and inner circumference. This is achieved by a piston ring for an internal combustion engine characterized in that its substantially central portion has a cross-sectional shape arched in a direction away from the remaining ring plates.

Yet again. According to the second combined invention of the present application, the object is made up of a first ring plate and a second ring plate having substantially the same dimensions, and the first ring plate and the second ring plate are The respective outer peripheral parts and the inner peripheral parts are fixed to each other by welding, and the approximately central part between the outer peripheral part and the inner peripheral part faces each other with a slight gap, and the At least one of the first ring plate and the second ring plate.

This is achieved by a piston ring for an internal combustion engine characterized in that the substantially central portion has a cross-sectional shape arched in a direction away from the remaining ring plates.

When the piston ring with such a configuration is installed in the ring groove of the piston, the first ring plate and the second ring plate are
Repressive contact mt with the upper wall and lower wall of the ring groove, respectively;
to always seal the top wall of the ring groove and the 'F wall.

Therefore, there is no gas that can penetrate deep into the ring groove and escape through the abutment gap of the piston ring.

Overall, less gas leaks into the crankcase. Thus, one aspect of the present invention has the effect that the reduction in engine output due to gas leakage is reduced.

In addition, as mentioned above, since the entire piston ring is always in elastic contact with the upper and lower walls of the ring groove and its position is fixed, the piston ring that occurs due to the downward movement of the piston The dancing, or so-called fluttering, is eliminated. Thus, the present invention eliminates the increase in groove width due to wear of the ring groove due to fluttering of the piston ring.

It also has the effect of reducing gas leakage over a long period of use.

Next, embodiments of the present invention will be described in detail based on the drawings. FIG. 4 is a front view of a piston song of an internal combustion engine according to a first embodiment of the specific invention of the present application.

FIG. 5 is a sectional view taken along the line v-v in FIG. 4.

As shown in FIG. 5, the piston ring lO.

A first ring plate 11 and a second ring plate 12 having approximately the same dimensions.
It consists of The outer peripheral part 13 of the first ring plate 11 and the outer peripheral part 14 of the second ring plate 12 are fixed to each other by beam welding to manufacture the piston ring 10. Note that the remaining portions of the first ring plate 11 and the second ring plate 12 face each other with a slight gap. The second ring plate is a flat plate, and the first ring plate 11 has an outer peripheral portion 13.
The substantially central portion 16 between the inner peripheral portion 15 and the second ring plate 12
It has a cross-sectional shape that is arched in the direction away from. Moreover, as shown in FIG. 4, the piston ring 10
has an abutment gap 23.

The operation of the embodiment described above will be explained based on FIGS. 6 and 7. 6 and 7 show the state in which the piston ring 10 is attached to the ring groove 18 of the piston 17. FIG. As shown in FIGS. 6 and 7, the first ring plate 11 and the second ring plate 12 are connected to the upper wall 1 of the ring groove 18, respectively.
9 and the lower wall 20, and always seals the upper wall and the lower wall of the ring groove 18. Therefore, piston j
The gas in the combustion chamber (not shown) that has entered the gap between the first ring plate 17 and the cylinder liner 21 as shown by the arrow E does not enter the ring groove 18 located further back from the substantially central portion 16 of the first ring plate 11. A portion 22 outside the approximately central portion 16 and a ring groove 18
It flows only between the upper wall 19 and the upper wall 19 as shown by the arrow F, and flows through the abutment gap 23 into the crankcase (not shown) as shown by the arrow G. Therefore, gas cannot enter deep into the ring 418.

Since the amount of gas leaking into the crankcase as a whole is reduced accordingly, the reduction in engine output due to gas leakage is reduced. Further, as described above, the piston ring 10 as a whole is in elastic contact with the upper wall 19 and the lower wall 20 of the ring groove 18 and its position is fixed, so that the piston can move downward. This eliminates the fluttering of the piston ring 10 that occurs with this. Thus,
Ring groove 1 due to flutter ring of piston ring 10
8. No more wear and tear.

FIG. 8 is a partial vertical sectional view of a piston ring for an internal combustion engine according to a second embodiment of the specific invention of the present application. As shown in FIG. 8, the piston ring 24 consists of a first ring plate 25 and a second ring plate 26, which have approximately the same dimensions. The inner peripheral part 27 of the first ring plate 25 and the inner peripheral part 28 of the second ring plate 26 are fixed together by beam welding, and the piston ring 24 is manufactured. In addition, the first glue/jig board 2
5 and the remaining portion of the second ring plate 26 are opposed to each other with a slight gap. The second ring plate 26 is a flat plate, and the first ring plate 25 has a substantially central portion 3o between its outer circumferential portion 29 and inner circumferential portion 27 bent into an arch in a direction away from the second ring plate 26. It has a cross-sectional shape.

The operation of this embodiment is exactly the same as that of the first embodiment, so the explanation thereof will be omitted.

FIG. 9 is a partial vertical sectional view of a piston ring of an internal combustion engine according to an embodiment of the first combined invention of the present application. In FIG. 9, the piston ring 31 is.

The first ring plates 32 have a U-shaped cross-sectional shape that opens outward in the radial direction, and are opposed to each other in the F-shaped cross section.
and the second ring plate 33 have approximately the same dimensions. The second ring plate 33 is a flat plate, and the first ring plate 32 has a substantially central part 36 between its outer peripheral part 34 and inner peripheral part 35 that is curved in the direction away from the second ring plate 33. It has a curved cross-sectional shape. Piston ring 31 like this
teeth.

A ring 37 having a cross-sectional shape as shown in the tenth direction
It is obtained by cutting the outer periphery of the groove.

Alternatively, it can be obtained by bending a long plate 38 having a cross-sectional shape as shown in FIG. 11 into a ring shape. In this case, the human flange portions 48, 49 of the long plate 38 become stretch flanges. Note that the operation of this embodiment is exactly the same as that of the first embodiment of the specific invention, so the explanation thereof will be omitted.

FIG. 12 is a partial vertical sectional view of a piston ring of an internal combustion engine according to an embodiment of the second combined invention of the present application. 12th
As shown in the figure, the piston ring 39 consists of a first ring plate 40 and a second ring plate 41 having approximately the same dimensions. The outer peripheral part 42 of the first ring plate 40 and the outer peripheral part 43 of the second ring plate 41 are fixed together by beam welding,
Also.

Inner peripheral part 44 of first ring plate 40 and second ring plate 41
The inner peripheral portions 45 of the piston rings 39 are fixed together by beam welding, and the piston ring 39 is manufactured. In addition.

Their approximately central portions 46 and 47 face each other with a slight gap. The first ring 40 has a substantially central portion 46 thereof.
has a cross-sectional shape bent in a bow in the direction away from the second ring plate, and the approximately central portion 47 of the second ring plate 41 is also bent in a bow in the direction away from the first ring plate. It has a cross-sectional shape. Note that the operation of this embodiment is exactly the same as that of the first embodiment of the specific invention, so the explanation thereof will be omitted.

[Brief explanation of drawings]

Fig. 1 is a partial vertical sectional view of a conventional piston ring;
FIG. 3 is a partial longitudinal sectional view of the piston with the piston link shown in FIG. 1 attached thereto, and FIG. 3 is a partial perspective view of the piston ring shown in FIG. 1 attached to the piston. FIG. 4 is a front view of a piston ring for an internal combustion engine according to the first embodiment of the specific invention of the present application, and FIG. 5 is a front view. FIG. 4 is a sectional view taken along the line v-v in FIG. 4, and FIG. 6 is a partial vertical sectional view of a piston equipped with the piston ring shown in FIG. FIG. 7 is a partial perspective view of the piston ring of FIG. 4 attached to the piston, and FIG. 8 is a partial vertical sectional view of the piston ring of an internal combustion engine according to a second embodiment of the specific invention of the present application. FIG. 9 is a partial vertical sectional view of a piston ring of an internal combustion engine according to an embodiment of the first combined invention of the present application, and FIG.
A partial longitudinal sectional view of the ring that is the basis of the piston ring in the figure.
FIG. 11 is a partial vertical cross-sectional view of a long plate that is the basis of the piston ring in FIG. 9, and FIG. It is a partial vertical cross-sectional view. 10, 24.31.39...Curved piston ring 11.2
5, 32.40...first ring plate 12, 26.
33.41...Second ring plate 13.29, 34
．． 42.4 Outer periphery of the first ring plate 14, 43...Outer periphery of the second ring plate 15.2
7, 35, 44...Inner peripheral part 28, 45 of the first ring plate...Inner peripheral part 16, 3 of the second ring plate
0.36.46... Approximately central portion of the first ring plate 41... Approximately central portion of the second ring plate Application
Toyota Motor Corporation 5 3rd hole 6th figure 7th figure 101 yen]

Claims (3)

[Claims] (1) Consisting of a first ring plate and a second ring plate of approximately the same dimensions, the outer periphery of each of the first ring plate and the second ring plate, or the inner periphery of each Either one of the parts is fixed to each other by welding, the remaining 9 parts face each other with a slight gap, and at least one of the first ring plate and the second ring plate,
A piston ring for an internal combustion engine, characterized in that a substantially central portion between an outer circumferential portion and an inner circumferential portion thereof has a cross-sectional shape arched in a direction away from the remaining ring plates. (2) A piston ring with a U-shaped cross section that opens outward in the radial direction, and the first ring plate and the second ring plate that face each other in the U-shaped cross section have approximately the same dimensions. and at least one of the first ring plate and the second ring plate. A piston ring for an internal combustion engine, characterized in that a substantially central portion between an outer circumferential portion and an inner circumferential portion thereof has a cross-sectional shape arched in a direction away from the remaining ring plates. (3) Consisting of a first ring plate and a second ring plate having approximately the same dimensions, the outer circumferential portions of each of the first ring plate and the second ring plate and the inner circumferential portion of each of the first ring plate and the second ring plate The first ring plate and the second ring plate are fixed to each other by welding, and substantially central portions between their outer and inner circumferences face each other with a slight gap between them. At least one of the
A piston ring for an internal combustion engine, characterized in that the substantially central portion has a cross-sectional shape arched in a direction away from the remaining ring plates.