JP2012180878A - Piston ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piston ring capable of reducing its own wear by reducing a load applied to the piston ring.SOLUTION: The piston ring 21 is provided with a protruding portion 23 formed on one end, and a recessed portion 24 formed on the other end, the protruding portion 23 and the recessed portion 24 forming a stepped end portion 22. Between the protruding portion 23 and the recessed portion 24, there is provided a gas channel for guiding gas acting on one side face 41c to another side face 41d.

Description

  The present invention relates to a piston ring, for example, a piston ring used in a reciprocating internal combustion engine such as a large marine two-cycle diesel engine.

  A piston ring, which is attached to a piston (more specifically, a piston crown) of a reciprocating internal combustion engine and maintains the pressure in the combustion chamber, when attached to the piston, once pushes the inner diameter of the piston ring beyond the outer diameter of the piston. In addition, after being installed in the ring groove provided on the piston, it will expand in the radial direction, thereby closely contacting the inner wall surface (inner circumferential surface) of the cylinder liner. There is a cut called. However, when a piston ring R2 (see FIG. 29) having a right angle joint or a piston ring R3 (see FIG. 30) having a diagonal joint is employed as a so-called pressure ring such as a top ring, the joint (gap) is used as combustion gas. Can pass through easily (pass through). For this reason, for example, a piston ring R1 (see FIG. 28) having a stepped joint (gas tight joint) disclosed in Patent Document 1 is generally adopted as a so-called pressure ring such as a top ring.

  However, when piston ring R1 (refer FIG. 28) provided with the stepped joint (gas tight joint) disclosed by patent document 1 is used as a top ring, the airtightness in the joint of the piston ring provided with the stepped joint is very In particular, the load received by the piston ring having the stepped joint, that is, the combustion gas pressure, is (substantially) larger than the piston rings after the second stage (piston rings after the second ring). As a result, the wear of the top ring becomes (remarkably) larger (faster) than the other piston rings, and the wear on the inner wall surface of the cylinder liner facing the top ring also becomes larger (faster). there were.

  Therefore, a piston top ring disclosed in Patent Document 2 is known as a piston ring for solving such problems.

Japanese Utility Model Publication No. 60-175850 JP 7-50739A

However, in the piston top ring 4 disclosed in Patent Document 2, the combustion gas is passed through a plurality of grooves 15 having a U-shape in plan view or a V-shape in plan view provided on the outer peripheral surface (sliding surface). Has been blown by. Therefore, a crack is generated in the groove 15 and the piston top ring 4 is broken or the depth of the groove 15 is reduced as the piston top ring 4 is worn. May disappear.
Further, in the piston top ring 4 disclosed in Patent Document 2, the inner wall surface of the cylinder liner is scratched at the corner of the groove 15 provided on the outer peripheral surface (sliding surface), or the outer peripheral surface is damaged. When the wear-resistant coating is applied, the wear-resistant coating may be peeled off from the corner of the groove 15.

  This invention is made | formed in view of such a situation, Comprising: It aims at providing the piston ring which can reduce own wear by reducing the load which self receives.

The present invention employs the following means in order to solve the above problems.
The piston ring according to the present invention is a piston ring having a convex portion at one end and a concave portion at the other end, and a stepped joint formed by the convex portion and the concave portion, A gas passage that guides gas acting on one side surface to the other side surface is provided between the recess and the recess.

According to the piston ring according to the present invention, the gas acting on one side is guided to the other side through the gas passage.
Thereby, the load which self receives can be reduced and self wear can be reduced.

  In the piston ring, the gas passage is formed in the convex portion and / or the concave portion between a notch and / or a circumferential groove and / or the convex portion and the concave portion formed along a circumferential direction. It is more preferable that the gap is a gap.

According to such a piston ring, even when the convex portion and the concave portion are brought into close contact with each other due to the pressure of the gas acting on one side surface, a gas passage for guiding the gas acting on one side surface to the other side surface is secured. .
As a result, the gas acting on one side can be guided to the other side regardless of the gap between the convex part and the concave part, and management of the gap formed between the convex part and the concave part can be made unnecessary. .
Further, for example, the piston ring 81 shown in FIG. 8 is advantageous in terms of strength against the gas pressure applied to the upper surface.

  In the piston ring, the notch is formed by a flat inclined surface or a curved surface that connects an inner peripheral end of an intermediate horizontal plane that forms the convex portion and an upper end of the intermediate inner peripheral surface that forms the convex portion. More preferably.

According to such a piston ring (for example, the piston ring 121 shown in FIG. 16), the workability in machining the notch is the best, so that productivity and workability can be improved, and the manufacturing cost can be reduced. Can be reduced.
Further, since the circumferential groove is provided at a place where the piston ring and the cylinder liner do not slide, the inner wall surface of the cylinder liner is not scratched by the corner of the groove.

  In the piston ring, the circumferential groove has a rectangular shape in sectional view, which is carved on the side of the one side surface along the circumferential direction at a central portion in the thickness direction of the intermediate horizontal plane that forms the concave portion. A circumferential groove, and a second circumferential groove having a rectangular shape in cross section, carved on the side of the other side surface along the circumferential direction at a central portion in the thickness direction of the intermediate horizontal surface forming the convex portion. More preferably.

According to such a piston ring (for example, the piston ring 151 shown in FIG. 22), the workability in machining the circumferential groove is the best, so that the productivity and workability can be improved, and the manufacturing cost can be reduced. Can be reduced.
Further, since the circumferential groove is provided at a place where the piston ring and the cylinder liner do not slide, the inner wall surface of the cylinder liner is not scratched by the corner of the groove.

  The said piston ring WHEREIN: If the clearance gap formed between the said convex part and the said recessed part is set so that it may be set to about 4 to 10 times the clearance gap in the piston ring provided with the conventional stepped joint. Is preferred.

According to such a piston ring, even if the piston ring is deformed by the pressure of the gas acting on one side surface, perfect adhesion between the convex portion and the concave portion is prevented (avoided), and the gas acting on the one side surface is prevented. A gas passage leading to the other side surface is secured.
Thereby, the load which self receives can be reduced and self wear can be reduced.

  In the piston ring, it is more preferable that the overlap in the circumferential direction between the convex portion and the concave portion is set to be about 2 to 4 times the height of the piston ring.

According to such a piston ring, even if the piston ring and the ring liner are worn, it is possible to ensure the overlap in the circumferential direction between the convex portion and the concave portion, and it is possible to ensure a certain gas passage area.
As a result, even after the piston ring and cylinder liner are worn, it is possible to reduce the load received by the piston ring and the cylinder liner, thereby reducing the wear of the piston ring and the cylinder liner.

  A piston ring set according to the present invention includes any one of the above-described piston rings, and a piston ring having a right angle joint and / or a piston ring having a diagonal joint.

  The piston ring set according to the present invention includes only one of the above piston rings.

  According to the piston ring set according to the present invention, the life of each piston ring comes (almost) at the same time, and the replacement time of the piston ring comes (almost) at the same time. Cost can be reduced.

  In the piston according to the present invention, any one of the above piston rings is inserted into the ring groove.

  According to the piston of the present invention, the life of each piston ring comes (substantially) at the same time, and the replacement time of the piston ring comes (substantially) at the same time. Can be reduced.

  An internal combustion engine according to the present invention includes the piston ring set or the piston.

  According to the internal combustion engine of the present invention, it is possible to reduce the wear of the inner wall surface of the cylinder liner, to extend the life of the cylinder liner (prolong the life), and to reduce the running cost.

  The piston ring according to the present invention has an effect that the load received by the piston ring can be reduced and the wear of the piston ring can be reduced.

It is a perspective view of the piston ring which concerns on 1st Embodiment of this invention. It is a figure which expands and shows the part enclosed with the dashed-two dotted line in FIG. It is AA arrow sectional drawing of FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 2nd Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 3rd Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 4th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 5th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 6th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 7th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 8th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 9th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 10th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 11th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 12th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 13th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 14th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 15th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 16th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 17th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 18th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 19th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 20th Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 21st Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 22nd Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a perspective view which expands and shows the principal part of the piston ring which concerns on 23rd Embodiment of this invention, Comprising: It is a figure similar to FIG. It is a schematic sectional drawing around the combustion chamber of a marine large two-cycle diesel engine. It is a fragmentary sectional view near a piston ring mounting part. It is a figure which expands and shows the joint of the piston ring provided with the stepped joint (gas tight joint). It is a figure which expands and shows the joint of the piston ring provided with the right angle joint. It is a figure which expands and shows the joint of the piston ring provided with the diagonal joint.

[First Embodiment]
Hereinafter, a piston ring according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 3, 26 and 27.
1 is a perspective view of a piston ring according to the present embodiment, FIG. 2 is an enlarged view of a portion surrounded by a two-dot chain line in FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA in FIG. 26 is a schematic sectional view around the combustion chamber of a large marine two-cycle diesel engine (hereinafter referred to as “diesel engine 1”), and FIG. 27 is a partial sectional view in the vicinity of the piston ring mounting portion.

  26 or 27, the piston 2 is fitted with a plurality of (three in this embodiment) ring grooves 3, 4 and 5 in the height direction, and one piston ring 6, 7 and 8 is fitted in the piston 2 respectively. It is inserted. The piston 2 reciprocates while the outer peripheral surfaces 6 a, 7 a, 8 a of the piston rings 6, 7, 8 are in sliding contact with the inner wall surface (inner peripheral surface) 9 a of the cylinder liner 9. A ring side surface gap 11 that opens to the combustion chamber 10 of the diesel engine 1 is formed in the upper portion of the piston 2, and the ring side surface gap 11 is filled with combustion gas from the combustion chamber 10.

  26 or 27, the cylinder head denoted by reference numeral 12 covers the upper surface of the cylinder liner 9 and forms the combustion chamber 10 together with the cylinder liner 9 and the piston 2. Further, in such a diesel engine 1, an exhaust valve 13 is provided at the center of the combustion chamber 10. The output of the piston 2 is transmitted from the piston rod 14 to a crankshaft (not shown).

The piston ring 21 according to the present embodiment is used, for example, as a piston ring (top ring) indicated by reference numeral 6 in FIGS. 26 and 27 and includes a stepped joint (gas tight joint) 22. .
As shown in at least one of FIGS. 1 to 3, the stepped joint 22 includes a convex part (male part) 23 and a concave part (female part) 24.
The convex portion 23 is a projecting member formed so as to extend along the circumferential direction at one end portion of the piston ring 21 and fit into the concave portion 24, and includes an outer peripheral surface (sliding surface) 31 and an intermediate inner surface. A peripheral surface 32, a first end surface 33, an intermediate horizontal surface 34, a second end surface 35, and a side surface (lower surface: bottom surface) 36 are provided.

The outer peripheral surface 31 continuously forms the same surface as the outer peripheral surface 41a in a portion other than one end portion of the piston ring 21 (hereinafter referred to as “piston ring main body 41”), and slides with the outer peripheral surface 41a ( It is a horizontal plane forming a surface that slides with respect to the inner wall surface 9a of the cylinder liner 9.
The intermediate inner peripheral surface 32 is a horizontal surface that is positioned on the radially outer side of the inner peripheral surface 41 b of the piston ring body 41 and forms a surface that faces the intermediate outer peripheral surface 51 that forms the recess 24.

The first end surface 33 is a vertical surface that forms a plane that faces the end surface 53 that forms the recess 24 at the tip (side) of one end of the piston ring 21.
The intermediate horizontal plane 34 is located on the side of one side surface (upper surface: top surface) 41c from the middle in the height direction (width direction) of the piston ring body 41, and forms a plane that faces the intermediate horizontal plane 52 that forms the recess 24. And is formed so as to be parallel to both side surfaces (upper surface 41c and lower surface 41d) of the piston ring body 41.

The second end surface 35 is a curved surface that smoothly connects the proximal end of the intermediate horizontal plane 34 and the distal end of one side surface (upper surface) 41 c at the proximal end (side) of one end of the piston ring 21.
The side surface (lower surface: bottom surface) 36 is a horizontal surface that forms the same surface as the other side surface (lower surface: bottom surface) 41 d of the piston ring body 41.

  The upper end of the first end surface 33 and the tip of the intermediate horizontal surface 34 are connected by a flat inclined surface 37, and the inner peripheral end of the intermediate horizontal surface 34 and the upper end of the intermediate inner peripheral surface 32 are curved surfaces 38. Connected by.

  The recess 24 is a recess formed so as to extend along the circumferential direction at the other end of the piston ring 21 and receive the projection 23, and includes an intermediate outer peripheral surface 51, an intermediate horizontal surface 52, and an end surface 53. And.

The intermediate outer peripheral surface 51 is a horizontal surface that is located on the radially inner side of the outer peripheral surface 41 a of the piston ring body 41 and forms a surface that faces the intermediate inner peripheral surface 32 that forms the convex portion 23.
The intermediate horizontal plane 52 is located on the side of one side surface (upper surface: top surface) 41c from the middle in the height direction (width direction) of the piston ring body 41, and is a plane facing the intermediate horizontal plane 34 forming the convex portion 23. It is a horizontal plane to be formed, and is formed so as to be parallel to both side surfaces (upper surface 41c and lower surface 41d) of the piston ring body 41.

The end surface 53 is a vertical surface that forms a plane that faces the first end surface 33 that forms the convex portion 23 at the base end (side) of the other end of the piston ring 21.
The upper end of the end surface 53 and the base end of the intermediate horizontal surface 52 are connected by a curved surface 54, and the inner peripheral end of the intermediate horizontal surface 52 and the upper end of the intermediate outer peripheral surface 51 are connected by a curved surface 55. .

In the present embodiment, the gap g between the intermediate horizontal plane 34 and the intermediate horizontal plane 52, the gap g between the curved face 38 and the curved face 55, and the gap g between the intermediate inner peripheral face 32 and the intermediate outer peripheral face 51 are shown in FIG. 4 to 10 times the gap (0.0 mm to 0.05 mm) in the piston ring R1 having the conventional stepped joint (gas tight joint) shown in 28, that is, about 0.0 mm <g ≦ 0.5 mm. It is set to be.
Further, the intermediate horizontal surface 34 and the intermediate horizontal surface 52, the curved surface 38 and the curved surface 55, and the intermediate inner peripheral surface 32 and the intermediate outer peripheral surface 51 overlap in the circumferential direction, that is, the intermediate horizontal surface 34, the intermediate horizontal surface 52, and the curved surface 38. The length in which the curved surface 55 and the intermediate inner peripheral surface 32 and the intermediate outer peripheral surface 51 overlap (overlap) in the circumferential direction is about 2 to 4 times the height (width) h of the piston ring body 41. Is set to

According to the piston ring 21 according to the present embodiment, even if the piston ring 21 is deformed by the pressure of the gas acting on the one side surface 41c, complete adhesion between the convex portion 23 and the concave portion 24 is prevented (avoided), A gas passage (gap g) for guiding the gas acting on the one side surface 41c to the other side surface 41d is secured.
Thereby, the load which self receives can be reduced and self wear can be reduced.

[Second Embodiment]
A piston ring according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 61 according to the present embodiment is different from that of the first embodiment described above in that gas passages (communication passages) 62 and 63 are provided instead of the gap g. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

  The gas passage 62 has a rectangular shape in sectional view, which is carved on the side surface (upper surface: top surface) 41c of the piston ring main body 41 along the circumferential direction at the center in the thickness direction of the intermediate horizontal plane 52 ( A first circumferential groove, one end (front end) is open to the (front) end surface 25 (see FIG. 2) of the other end, and the other end (base end) is located above the inclined surface 37. The ring body 41 is opened at the other end portion or at the other end portion of the piston ring body 41 located on the curved surface 54 side with respect to the inclined surface 37.

  The gas passage 63 is a circumferential groove having a rectangular shape in cross section, carved on the side of the inner circumferential surface 41b of the piston ring body 41 along the circumferential direction at the central portion in the height direction of the intermediate outer circumferential surface 51. One end (front end) opens to the (front) end surface 25 (see FIG. 2) of the other end portion, and the other end (base end) is the other end portion of the piston ring main body 41 located radially inside the inclined surface 37. Alternatively, the piston ring body 41 is opened at the other end of the piston ring body 41 located on the curved surface 54 side of the inclined surface 37.

According to the piston ring 61 according to the present embodiment, the gas acting on the one side surface 41c is guided to the other side surface 41d through the gas passages 62 and 63.
Thereby, the load which self receives can be reduced and self wear can be reduced.

Further, according to the piston ring 61 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are brought into close contact with each other due to the pressure of the gas acting on the one side surface 41c, the gas acting on the one side surface 41c is applied to the other side surface 41d. The gas passages 62 and 63 for guiding are secured.
As a result, the gas acting on one side surface 41 c can be guided to the other side surface 41 d regardless of the gap between the convex portion 23 and the concave portion 24, and the gap formed between the convex portion 23 and the concave portion 24 can be managed. It can be unnecessary.

[Third Embodiment]
A piston ring according to a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is an enlarged perspective view showing the main part of the piston ring according to the present embodiment, which is the same as FIG.
The piston ring 66 according to the present embodiment is different from that of the second embodiment described above in that gas passages (communication passages) 67 and 68 are provided instead of the gas passages (communication passages) 62 and 63. Since other components are the same as those in the above-described embodiment, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as embodiment mentioned above.

  The gas passage 67 is a (second) circumferential groove that has a rectangular shape in cross-section and is carved on the side surface (lower surface: bottom surface) 36 along the circumferential direction at the center in the thickness direction of the intermediate horizontal plane 34. Yes, one end (front end) is open to the inclined surface 37, and the other end (base end) is the intermediate horizontal surface 34 located below the (front) end surface 25 (see FIG. 2), or the (front) end surface 25 (see FIG. 2), the intermediate horizontal surface 34 is located closer to the curved surface 35 (see FIG. 2).

  The gas passage 68 is a circumferential groove having a rectangular shape in sectional view, which is carved on the side of the outer circumferential surface 31 along the circumferential direction at the central portion in the height direction of the intermediate inner circumferential surface 32, and has one end (tip). The first end face 33 opens, and the other end (base end) is the intermediate inner peripheral surface 32 positioned below the (front) end face 25 (see FIG. 2), or the (front) end face 25 (see FIG. 2). It opens to the intermediate inner peripheral surface 32 located closer to the curved surface 35 (see FIG. 2).

According to the piston ring 66 according to the present embodiment, the gas acting on the one side surface 41 c is guided to the other side surface 41 d through the gas passages 67 and 68.
Thereby, the load which self receives can be reduced and self wear can be reduced.

Further, according to the piston ring 66 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are brought into close contact with each other due to the pressure of the gas acting on the one side surface 41c, the gas acting on the one side surface 41c is applied to the other side surface 41d. The guiding gas passages 67 and 68 are secured.
As a result, the gas acting on one side surface 41 c can be guided to the other side surface 41 d regardless of the gap between the convex portion 23 and the concave portion 24, and the gap formed between the convex portion 23 and the concave portion 24 can be managed. It can be unnecessary.

[Fourth Embodiment]
A piston ring according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 6 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 71 according to the present embodiment is provided with the gas passages (communication passages) 62 and 63 described in the second embodiment and the gas passages (communication passages) 67 and 68 described in the third embodiment. This is different from that of the first embodiment described above. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.

According to the piston ring 71 according to the present embodiment, the gas acting on the one side surface 41 c is guided to the other side surface 41 d through the gas passages 62, 63, 67 and 68.
Thereby, the load which self receives can be reduced and self wear can be reduced.

Further, according to the piston ring 71 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are brought into close contact with each other due to the pressure of the gas acting on the one side surface 41c, the gas acting on the one side surface 41c is applied to the other side surface 41d. The gas passages 62, 63, 67, and 68 for guiding are secured.
As a result, the gas acting on one side surface 41 c can be guided to the other side surface 41 d regardless of the gap between the convex portion 23 and the concave portion 24, and the gap formed between the convex portion 23 and the concave portion 24 can be managed. It can be unnecessary.

[Fifth Embodiment]
A piston ring according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 7 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
In the piston ring 76 according to the present embodiment, a gap g is formed between the intermediate horizontal plane 34 and the intermediate horizontal plane 52, and a gap g is formed between the curved surface 38 and the curved surface 55. It differs from that of the first embodiment described above. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

According to the piston ring 76 according to the present embodiment, even if the piston ring 76 is deformed by the pressure of the gas acting on the one side surface 41c, complete adhesion between the convex portion 23 and the concave portion 24 is prevented (avoided), A gas passage (gap g) for guiding the gas acting on the one side surface 41c to the other side surface 41d is secured.
Thereby, the load which self receives can be reduced and self wear can be reduced.

[Sixth Embodiment]
A piston ring according to a sixth embodiment of the present invention will be described with reference to FIG. FIG. 8 is an enlarged perspective view showing the main part of the piston ring according to the present embodiment, which is the same as FIG.
In the piston ring 81 according to the present embodiment, a gap g is formed between the intermediate inner peripheral surface 32 and the intermediate outer peripheral surface 51, and a gap g is formed between the curved surface 38 and the curved surface 55. This is different from that of the first embodiment described above. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

According to the piston ring 81 according to the present embodiment, even if the piston ring 81 is deformed by the pressure of the gas acting on the one side surface 41c, complete adhesion between the convex portion 23 and the concave portion 24 is prevented (avoided), A gas passage (gap g) for guiding the gas acting on the one side surface 41c to the other side surface 41d is secured.
Thereby, the load which self receives can be reduced and self wear can be reduced.

[Seventh Embodiment]
A piston ring according to a seventh embodiment of the present invention will be described with reference to FIG. FIG. 9 is an enlarged perspective view showing the main part of the piston ring according to the present embodiment, which is the same as FIG.
The piston ring 86 according to this embodiment is provided with the gap g described in the fifth embodiment and the gap g described in the sixth embodiment. Different from the embodiment. Since the other components are the same as those in the fifth embodiment and the sixth embodiment described above, description of these components is omitted here.
In FIG. 9, gaps g are formed between the intermediate horizontal surface 34 and the intermediate horizontal surface 52, between the curved surface 38 and the curved surface 55, and between the intermediate inner peripheral surface 32 and the intermediate outer peripheral surface 51, respectively. That is, what has the same form as 1st Embodiment is shown.

According to the piston ring 86 according to the present embodiment, even if the piston ring 86 is deformed by the pressure of the gas acting on the one side surface 41c, complete adhesion between the convex portion 23 and the concave portion 24 is prevented (avoided), A gas passage (gap g) for guiding the gas acting on the one side surface 41c to the other side surface 41d is secured.
Thereby, the load which self receives can be reduced and self wear can be reduced.

[Eighth Embodiment]
A piston ring according to an eighth embodiment of the present invention will be described with reference to FIG. FIG. 10 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 91 according to the present embodiment is different from that of the first embodiment described above in that gas passages (communication passages) 92 and 93 are provided instead of the gap g. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

  The gas passage 92 has a semicircular shape in sectional view, which is carved on the side of one side surface (upper surface: top surface) 41c of the piston ring main body 41 along the circumferential direction at the central portion in the thickness direction of the intermediate horizontal plane 52. It is a circumferential groove, one end (front end) opens to the (front) end face 25 (see FIG. 2) of the other end, and the other end (base end) of the piston ring main body 41 located above the inclined surface 37. The other end portion or the other end portion of the piston ring main body 41 located closer to the curved surface 54 than the inclined surface 37 opens.

  The gas passage 93 is a circumferential groove having a semicircular shape in sectional view, which is carved on the inner circumferential surface 41b side of the piston ring main body 41 along the circumferential direction at the central portion in the height direction of the intermediate outer circumferential surface 51. One end (front end) opens to the (front) end face 25 (see FIG. 2) of the other end, and the other end (base end) is the other end of the piston ring main body 41 located radially inside the inclined surface 37. Or the other end portion of the piston ring main body 41 located closer to the curved surface 54 than the inclined surface 37.

According to the piston ring 91 according to the present embodiment, the gas acting on the one side surface 41c is guided to the other side surface 41d through the gas passages 92 and 93.
Thereby, the load which self receives can be reduced and self wear can be reduced.

Further, according to the piston ring 91 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are brought into close contact with each other due to the pressure of the gas acting on the one side surface 41c, the gas acting on the one side surface 41c is applied to the other side surface 41d. The guiding gas passages 92 and 93 are secured.
As a result, the gas acting on one side surface 41 c can be guided to the other side surface 41 d regardless of the gap between the convex portion 23 and the concave portion 24, and the gap formed between the convex portion 23 and the concave portion 24 can be managed. It can be unnecessary.

[Ninth Embodiment]
A piston ring according to a ninth embodiment of the present invention will be described with reference to FIG. FIG. 11 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 96 according to the present embodiment is different from that of the eighth embodiment described above in that gas passages (communication passages) 97 and 98 are provided instead of the gas passages (communication passages) 92 and 93. Since other components are the same as those in the above-described embodiment, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as embodiment mentioned above.

  The gas passage 97 is a circumferential groove having a semicircular shape in sectional view, which is carved on the side surface (lower surface: bottom surface) 36 along the circumferential direction at the central portion in the thickness direction of the intermediate horizontal plane 34 and has one end ( The front end is open to the inclined surface 37, and the other end (base end) is from the intermediate horizontal plane 34 positioned below the (front) end surface 25 (see FIG. 2) or from the (front) end surface 25 (see FIG. 2). Is also open to the intermediate horizontal plane 34 located on the curved surface 35 (see FIG. 2) side.

  The gas passage 98 is a circumferential groove having a semicircular shape in sectional view, which is carved on the side of the outer circumferential surface 31 along the circumferential direction at the center in the height direction of the intermediate inner circumferential surface 32, and has one end (tip). Is open to the first end surface 33, and the other end (base end) is the intermediate inner peripheral surface 32 positioned below the (front) end surface 25 (see FIG. 2) or the (front) end surface 25 (see FIG. 2). ) To the intermediate inner peripheral surface 32 located on the curved surface 35 (see FIG. 2) side.

According to the piston ring 96 according to the present embodiment, the gas acting on the one side surface 41 c is guided to the other side surface 41 d through the gas passages 97 and 98.
Thereby, the load which self receives can be reduced and self wear can be reduced.

Further, according to the piston ring 96 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are brought into close contact with each other by the pressure of the gas acting on the one side surface 41c, the gas acting on the one side surface 41c is applied to the other side surface 41d. The guiding gas passages 97 and 98 are secured.
As a result, the gas acting on one side surface 41 c can be guided to the other side surface 41 d regardless of the gap between the convex portion 23 and the concave portion 24, and the gap formed between the convex portion 23 and the concave portion 24 can be managed. It can be unnecessary.

[Tenth embodiment]
A piston ring according to a tenth embodiment of the present invention will be described with reference to FIG. FIG. 12 is an enlarged perspective view showing the main part of the piston ring according to the present embodiment, which is the same as FIG.
The piston ring 101 according to this embodiment is provided with the gas passages (communication passages) 92 and 93 described in the eighth embodiment and the gas passages (communication passages) 97 and 98 described in the ninth embodiment. This is different from that of the first embodiment described above. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.

According to the piston ring 101 according to the present embodiment, the gas acting on the one side surface 41c is guided to the other side surface 41d through the gas passages 92, 93, 97, and 98.
Thereby, the load which self receives can be reduced and self wear can be reduced.

Further, according to the piston ring 101 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are brought into close contact with each other due to the pressure of the gas acting on the one side surface 41c, the gas acting on the one side surface 41c is applied to the other side surface 41d. The gas passages 92, 93, 97 and 98 for guiding are secured.
As a result, the gas acting on one side surface 41 c can be guided to the other side surface 41 d regardless of the gap between the convex portion 23 and the concave portion 24, and the gap formed between the convex portion 23 and the concave portion 24 can be managed. It can be unnecessary.

[Eleventh embodiment]
A piston ring according to an eleventh embodiment of the present invention will be described with reference to FIG. FIG. 13 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 106 according to the present embodiment is different from that of the first embodiment described above in that gas passages (communication passages) 107 and 108 are provided instead of the gap g. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

  The gas passage 107 has a triangular shape in a cross-sectional view (in this embodiment), which is carved on one side (upper surface: top surface) 41c side of the piston ring main body 41 along the circumferential direction at the center in the thickness direction of the intermediate horizontal plane 52. In the form, it is a circumferential groove having an equilateral triangle shape. One end (tip) is open to the (front) end surface 25 (see FIG. 2) of the other end, and the other end (base end) is above the inclined surface 37. The other end of the piston ring main body 41 located at the side or the other end of the piston ring main body 41 located closer to the curved surface 54 than the inclined surface 37 opens.

  The gas passage 108 has a triangular shape (in the present embodiment, a regular triangle) engraved on the side of the inner peripheral surface 41b of the piston ring body 41 along the circumferential direction at the central portion in the height direction of the intermediate outer peripheral surface 51. 1) (one end (tip)) is open on the (end) end face 25 (see FIG. 2) of the other end, and the other end (base end) is located on the radially inner side of the inclined surface 37. The other end of the piston ring main body 41 is opened, or the other end of the piston ring main body 41 located closer to the curved surface 54 than the inclined surface 37 opens.

According to the piston ring 106 according to the present embodiment, the gas acting on the one side surface 41 c is guided to the other side surface 41 d through the gas passages 107 and 108.
Thereby, the load which self receives can be reduced and self wear can be reduced.

Further, according to the piston ring 106 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are in close contact with each other due to the pressure of the gas acting on the one side surface 41c, the gas acting on the one side surface 41c is applied to the other side surface 41d. The gas passages 107 and 108 for guiding are secured.
As a result, the gas acting on one side surface 41 c can be guided to the other side surface 41 d regardless of the gap between the convex portion 23 and the concave portion 24, and the gap formed between the convex portion 23 and the concave portion 24 can be managed. It can be unnecessary.

[Twelfth embodiment]
A piston ring according to a twelfth embodiment of the present invention will be described with reference to FIG. FIG. 14 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 111 according to this embodiment is different from that of the eleventh embodiment described above in that gas passages (communication passages) 112 and 113 are provided instead of the gas passages (communication passages) 107 and 108. Since other components are the same as those in the above-described embodiment, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as embodiment mentioned above.

  The gas passage 112 has a triangular shape (regular triangle shape in this embodiment) engraved on the side surface (lower surface: bottom surface) 36 along the circumferential direction at the central portion in the thickness direction of the intermediate horizontal plane 34. One end (tip) is open to the inclined surface 37, and the other end (base end) is an intermediate horizontal plane 34 located below the (front) end surface 25 (see FIG. 2), or (front). It opens in the intermediate | middle horizontal surface 34 located in the curved surface 35 (refer FIG. 2) side rather than the end surface 25 (refer FIG. 2).

  The gas passage 98 has a triangular shape (regular triangular shape in the present embodiment) in a sectional view, which is carved on the outer peripheral surface 31 side along the circumferential direction at the central portion in the height direction of the intermediate inner peripheral surface 32. One end (front end) of the groove is open to the first end surface 33, and the other end (base end) is the intermediate inner peripheral surface 32 positioned below the (front) end surface 25 (see FIG. 2), or ( First, it opens to the intermediate inner peripheral surface 32 located on the curved surface 35 (see FIG. 2) side than the end surface 25 (see FIG. 2).

According to the piston ring 111 according to the present embodiment, the gas acting on the one side surface 41c is guided to the other side surface 41d through the gas passages 112 and 113.
Thereby, the load which self receives can be reduced and self wear can be reduced.

Further, according to the piston ring 111 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are brought into close contact with each other due to the pressure of the gas acting on the one side surface 41c, the gas acting on the one side surface 41c is applied to the other side surface 41d. The gas passages 112 and 113 for guiding are secured.
As a result, the gas acting on one side surface 41 c can be guided to the other side surface 41 d regardless of the gap between the convex portion 23 and the concave portion 24, and the gap formed between the convex portion 23 and the concave portion 24 can be managed. It can be unnecessary.

[Thirteenth embodiment]
A piston ring according to a thirteenth embodiment of the present invention will be described with reference to FIG. FIG. 15 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 116 according to this embodiment is provided with the gas passages (communication passages) 107 and 108 described in the eleventh embodiment and the gas passages (communication passages) 112 and 113 described in the twelfth embodiment. This is different from that of the first embodiment described above. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.

According to the piston ring 116 according to the present embodiment, the gas acting on the one side surface 41c is guided to the other side surface 41d through the gas passages 107, 108, 112, and 113.
Thereby, the load which self receives can be reduced and self wear can be reduced.

Further, according to the piston ring 116 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are brought into close contact with each other due to the pressure of the gas acting on the one side surface 41c, the gas acting on the one side surface 41c is applied to the other side surface 41d. The gas passages 107, 108, 112, and 113 for guiding are secured.
As a result, the gas acting on one side surface 41 c can be guided to the other side surface 41 d regardless of the gap between the convex portion 23 and the concave portion 24, and the gap formed between the convex portion 23 and the concave portion 24 can be managed. It can be unnecessary.

[Fourteenth embodiment]
A piston ring according to a fourteenth embodiment of the present invention will be described with reference to FIG. FIG. 16 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 121 according to the present embodiment is different from that of the first embodiment described above in that a notch 122 is provided instead of the gap g. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

  The notch 122 is formed by a flat inclined surface or curved surface that connects the inner peripheral end of the intermediate horizontal surface 34 and the upper end of the intermediate inner peripheral surface 32, and one end (tip) extends to the inclined surface 37. The end (base end) extends to a position below the (front) end surface 25 (see FIG. 2) or to a position closer to the curved surface 35 (see FIG. 2) than the (front) end surface 25 (see FIG. 2). Yes.

According to the piston ring 121 according to the present embodiment, the gas acting on the one side surface 41 c passes through a gap (gas passage) formed between the inclined surface or curved surface forming the notch 122 and the recess 24. Thus, it is guided to the other side surface 41d.
Thereby, the load which self receives can be reduced and self wear can be reduced.

Further, according to the piston ring 121 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are brought into close contact with each other by the pressure of the gas acting on the one side surface 41c, the gas acting on the one side surface 41c is applied to the other side surface 41d. A guiding gap (gas passage) is secured.
As a result, the gas acting on one side surface 41 c can be guided to the other side surface 41 d regardless of the gap between the convex portion 23 and the concave portion 24, and the gap formed between the convex portion 23 and the concave portion 24 can be managed. It can be unnecessary.

[Fifteenth embodiment]
A piston ring according to a fifteenth embodiment of the present invention will be described with reference to FIG. FIG. 17 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 126 according to the present embodiment is different from that of the first embodiment described above in that a notch 127 is provided instead of the gap g. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

  The notch 127 is formed by a flat inclined surface or curved surface that connects the lower end of the intermediate inner peripheral surface 32 and the inner peripheral end of the side surface 36, and one end (front end) extends to the first end surface 33, The other end (base end) extends to a position below the (front) end face 25 (see FIG. 2) or to a position closer to the curved surface 35 (see FIG. 2) than the (front) end face 25 (see FIG. 2). ing.

According to the piston ring 126 according to the present embodiment, the gas acting on the one side surface 41 c passes through the gap (gas passage) formed between the inclined surface forming the notch 127 and the recess 24, and the other side surface. It will be guided to 41d.
Thereby, the load which self receives can be reduced and self wear can be reduced.

Further, according to the piston ring 126 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are brought into close contact with each other by the pressure of the gas acting on the one side surface 41c, the gas acting on the one side surface 41c is applied to the other side surface 41d. A guiding gap (gas passage) is secured.
As a result, the gas acting on one side surface 41 c can be guided to the other side surface 41 d regardless of the gap between the convex portion 23 and the concave portion 24, and the gap formed between the convex portion 23 and the concave portion 24 can be managed. It can be unnecessary.

[Sixteenth Embodiment]
A piston ring according to a sixteenth embodiment of the present invention will be described with reference to FIG. FIG. 18 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 131 according to the present embodiment is the same as that of the first embodiment described above in that the notch 122 described in the fourteenth embodiment and the notch 127 described in the fifteenth embodiment are provided. Different from the one. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.

According to the piston ring 131 according to the present embodiment, the gas acting on the one side surface 41c is a gap (gas passage) formed between the inclined surface or the curved surface forming the notch 122 and the recess 24, and It is guided to the other side surface 41d through a gap (gas passage) formed between the inclined surface or the curved surface forming the notch 127 and the recess 24.
Thereby, the load which self receives can be reduced and self wear can be reduced.

Further, according to the piston ring 131 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are brought into close contact with each other due to the pressure of the gas acting on the one side surface 41c, the gas acting on the one side surface 41c is applied to the other side surface 41d. A guiding gap (gas passage) is secured.
As a result, the gas acting on one side surface 41 c can be guided to the other side surface 41 d regardless of the gap between the convex portion 23 and the concave portion 24, and the gap formed between the convex portion 23 and the concave portion 24 can be managed. It can be unnecessary.

[Seventeenth embodiment]
A piston ring according to a seventeenth embodiment of the present invention will be described with reference to FIG. FIG. 19 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 136 according to the present embodiment is different from that of the first embodiment described above in that a gas passage (communication passage) 137 is provided instead of the gap g. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

  The gas passage 137 connects the inner peripheral edge of the intermediate horizontal surface 52 and the upper end of the intermediate outer peripheral surface 51, and is disposed on one side (upper surface: top surface) 41 c and the inner peripheral surface 41 b side along the circumferential direction. Is a circumferential groove having a circular shape of 3/4 in cross section, with one end (tip) opening in the (front) end face 25 (see FIG. 2) of the other end and the other end (base end) The other end of the piston ring main body 41 located above the inclined surface 37 or the other end of the piston ring main body 41 positioned closer to the curved surface 54 than the inclined surface 37 is opened.

According to the piston ring 136 according to the present embodiment, the gas acting on the one side surface 41c is guided to the other side surface 41d through the gas passage 137.
Thereby, the load which self receives can be reduced and self wear can be reduced.

Further, according to the piston ring 136 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are brought into close contact with each other due to the pressure of the gas acting on the one side surface 41c, the gas acting on the one side surface 41c is applied to the other side surface 41d. A gas passage 137 for guiding is secured.
As a result, the gas acting on one side surface 41 c can be guided to the other side surface 41 d regardless of the gap between the convex portion 23 and the concave portion 24, and the gap formed between the convex portion 23 and the concave portion 24 can be managed. It can be unnecessary.

[Eighteenth embodiment]
A piston ring according to an eighteenth embodiment of the present invention will be described with reference to FIG. FIG. 20 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 141 according to the present embodiment is different from that of the first embodiment described above in that a notch 142 is provided instead of the gap g. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment mentioned above.

  The notch 142 is formed by a flat inclined surface or curved surface that connects the lower end of the intermediate outer peripheral surface 51 and the outer peripheral end of the other side surface (lower surface: bottom surface) 41d at the other end of the piston ring body 41, One end (front end) extends to the lower side of the (front) end face 25 (see FIG. 2) of the other end, and the other end (base end) is radially inward of the first end face 33 or from the first end face 33. Also extends to a position located on the end face 53 side.

According to the piston ring 141 according to the present embodiment, the gas acting on the one side surface 41 c passes through a gap (gas passage) formed between the inclined surface or curved surface forming the notch 142 and the recess 24. Thus, it is guided to the other side surface 41d.
Thereby, the load which self receives can be reduced and self wear can be reduced.

Further, according to the piston ring 141 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are brought into close contact with each other due to the pressure of the gas acting on the one side surface 41c, the gas acting on the one side surface 41c is applied to the other side surface 41d. A guiding gap (gas passage) is secured.
As a result, the gas acting on one side surface 41 c can be guided to the other side surface 41 d regardless of the gap between the convex portion 23 and the concave portion 24, and the gap formed between the convex portion 23 and the concave portion 24 can be managed. It can be unnecessary.

[Nineteenth Embodiment]
A piston ring according to a nineteenth embodiment of the present invention will be described with reference to FIG. FIG. 21 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 146 according to the present embodiment is the same as that of the first embodiment described above in that the gas passage 137 described in the seventeenth embodiment and the notch 142 described in the eighteenth embodiment are provided. Different from the one. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.

  Since the operational effects according to the present embodiment are the same as the operational effects described in the seventeenth and eighteenth embodiments, the description thereof is omitted here.

[20th embodiment]
A piston ring according to a twentieth embodiment of the present invention will be described with reference to FIG. FIG. 22 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 151 according to the present embodiment is the same as that of the first embodiment described above in that the gas passage 62 described in the second embodiment and the gas passage 67 described in the third embodiment are provided. Different from the one. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.

According to the piston ring 151 according to the present embodiment, the gas acting on the one side surface 41c is guided to the other side surface 41d through the gas passages 62 and 67.
Thereby, the load which self receives can be reduced and self wear can be reduced.

Further, according to the piston ring 151 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are brought into close contact with each other due to the pressure of the gas acting on the one side surface 41c, the gas acting on the one side surface 41c is applied to the other side surface 41d. The gas passages 62 and 67 for guiding are secured.
As a result, the gas acting on one side surface 41 c can be guided to the other side surface 41 d regardless of the gap between the convex portion 23 and the concave portion 24, and the gap formed between the convex portion 23 and the concave portion 24 can be managed. It can be unnecessary.

[Twenty-first embodiment]
A piston ring according to a twenty-first embodiment of the present invention will be described with reference to FIG. FIG. 23 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 156 according to the present embodiment is the same as that of the first embodiment described above in that the notch 122 described in the fourteenth embodiment and the gas passage 137 described in the seventeenth embodiment are provided. Different from the one. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.

  Since the operational effects according to the present embodiment are the same as the operational effects described in the fourteenth and seventeenth embodiments, the description thereof is omitted here.

[Twenty-second embodiment]
A piston ring according to a twenty-second embodiment of the present invention will be described with reference to FIG. FIG. 24 is an enlarged perspective view showing the main part of the piston ring according to this embodiment, which is the same as FIG.
The piston ring 161 according to the present embodiment is the same as that of the first embodiment described above in that the notch 127 described in the fifteenth embodiment and the notch 142 described in the eighteenth embodiment are provided. Different from the one. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.

  Since the operational effects according to the present embodiment are the same as the operational effects described in the fifteenth and eighteenth embodiments, the description thereof is omitted here.

[Twenty-third embodiment]
A piston ring according to a twenty-third embodiment of the present invention will be described with reference to FIG. FIG. 25 is an enlarged perspective view showing a main part of the piston ring according to the present embodiment, which is the same as FIG.
The piston ring 166 according to this embodiment includes the notch 122 described in the fourteenth embodiment, the notch 127 described in the fifteenth embodiment, the gas passage 137 described in the seventeenth embodiment, It differs from that of the first embodiment described above in that the notch 142 described in the eighteenth embodiment is provided. Since other components are the same as those of the first embodiment described above, description of these components is omitted here.

  The operational effects according to the present embodiment are the same as the operational effects described in the fourteenth embodiment, the fifteenth embodiment, the seventeenth embodiment, and the eighteenth embodiment, and thus the description thereof is omitted here.

  In the above-described embodiment, the best workability when machining the notch is that of the fourteenth embodiment shown in FIG. 16, and the best workability when machining the circumferential groove. These are those of the twentieth embodiment shown in FIG.

  In addition, the present invention is not limited to the above-described embodiment, and the above-described embodiment may be appropriately combined as necessary, or the above-described embodiment may be appropriately modified or changed as necessary. it can.

  Furthermore, the piston ring according to the present invention can be used not only as a top ring but also in a second-stage and subsequent piston rings (second-ring and subsequent piston rings).

  Furthermore, in the above-described embodiment, the piston 2 in which the three ring grooves 3, 4 and 5 are formed in the height direction has been described as a specific example, but the piston according to the present invention is limited to this. It may be a piston in which one, two, four or more ring grooves are formed in the height direction.

1 Diesel engine (internal combustion engine)
2 piston 3 ring groove 4 ring groove 5 ring groove 21 piston ring 22 stepped joint 23 convex part 24 concave part 32 intermediate inner peripheral surface 34 intermediate horizontal surface 51 intermediate outer peripheral surface 52 intermediate horizontal surface 61 piston ring 62 (first) peripheral groove ( Gas passage)
63 Circumferential groove (gas passage)
66 Piston ring 67 (second) circumferential groove (gas passage)
68 Circumferential groove (gas passage)
71 Piston ring 76 Piston ring 81 Piston ring 86 Piston ring 91 Piston ring 92 Circumferential groove (gas passage)
93 Circumferential groove (gas passage)
96 Piston ring 97 Circumferential groove (gas passage)
98 Circumferential groove (gas passage)
101 Piston ring 106 Piston ring 107 Circumferential groove (gas passage)
108 Circumferential groove (gas passage)
111 Piston ring 112 Circumferential groove (gas passage)
113 Circumferential groove (gas passage)
116 Piston ring 121 Piston ring 122 Notch 126 Piston ring 127 Notch 131 Piston ring 136 Piston ring 137 Circumferential groove (gas passage)
141 Piston ring 142 Notch 146 Piston ring 151 Piston ring 156 Piston ring 161 Piston ring 166 Piston ring g Clearance h Piston ring height (width)

Claims (10)

A piston ring having a convex portion at one end and a concave portion at the other end, and a stepped joint formed by the convex portion and the concave portion,
A piston ring characterized in that a gas passage for guiding gas acting on one side surface to the other side surface is provided between the convex portion and the concave portion.   The gas passage includes a notch and / or a circumferential groove formed along the circumferential direction in the convex portion and / or the concave portion and / or a gap formed between the convex portion and the concave portion. The piston ring according to claim 1.   The notch is formed by a flat inclined surface connecting an inner peripheral end of an intermediate horizontal plane forming the convex portion and an upper end of the intermediate inner peripheral surface forming the convex portion. Item 3. The piston ring according to Item 2.   The circumferential groove is a first circumferential groove having a rectangular shape in sectional view, which is carved on the side of the one side surface along the circumferential direction at a central portion in the thickness direction of the intermediate horizontal plane forming the recess, A second circumferential groove having a rectangular shape in cross-sectional view, which is carved on the side of the other side surface along the circumferential direction at the central portion in the thickness direction of the intermediate horizontal plane forming the convex portion. The piston ring according to claim 2.   The clearance gap formed between the said convex part and the said recessed part is set so that it may become about 4 to 10 times the clearance gap in the piston ring provided with the conventional stepped joint. 2. The piston ring according to 2.   6. The overlap in the circumferential direction between the convex portion and the concave portion is set to be about 2 to 4 times the height of the piston ring. 6. Piston ring as described in. The piston ring according to any one of claims 1 to 6,
A piston ring set comprising: a piston ring having a right angle joint and / or a piston ring having a skew joint.   Only the piston ring as described in any one of Claim 1 to 6 is provided, The piston ring set characterized by the above-mentioned.   The piston ring according to any one of claims 1 to 6, wherein the piston ring is fitted into a ring groove.   An internal combustion engine comprising the piston ring set according to claim 7 or 8, or the piston according to claim 9.

Images