KR101680510B1 - Piston ring - Google Patents

Abstract

The load applied to the piston ring can be reduced, and the wear of the piston ring can be reduced. A piston 22 having a convex portion 23 at one end and a concave portion 24 at the other end and a stepped joint 22 formed by the convex portion 23 and the concave portion 24, As the ring 21, a gas passage is formed between the convex portion 23 and the concave portion 24 for guiding the gas acting on the one side face 41c to the other side face 41d.

Description

Piston ring {PISTON RING}

The present invention relates to a piston ring, for example, a piston ring used in a reciprocating internal combustion engine such as a large 2-cycle diesel engine for a ship.

The piston ring mounted on the piston (more specifically, the piston crown) of the reciprocating internal combustion engine and maintaining the pressure in the combustion chamber needs to be widened so that the inner diameter of the piston ring is once greater than the outer diameter of the piston. After being mounted in the ring groove formed in the piston, a boundary called a seam is formed at one point in order to make the cylinder liner closely contact with the inner wall surface (inner peripheral surface) of the cylinder liner by expanding in the radial direction. However, if a piston ring R2 (see Fig. 29) provided with a right angle joint or a piston ring R3 (see Fig. 30) provided with an inclined joint is used as a so-called pressure ring such as a top ring, ), The flue gas is simply passed out (it passes as it is). For this reason, for example, a piston ring R1 (see Fig. 28) provided with a stepped joint (gas tight joint) disclosed in Patent Document 1 is generally employed as a so-called pressure ring such as a top ring.

However, when the piston ring R1 (see Fig. 28) provided with the stepped joint (gas tight joint) disclosed in Patent Document 1 is used as the top ring, the airtightness of the joint of the piston ring having the stepped joint is The load applied to the piston ring having the stepped joint, that is, the combustion gas pressure is (significantly) larger than that of the piston ring after the second stage (piston ring after the second ring). Therefore, the wear of the top ring is (significantly) larger (faster) than that of the other piston rings, and the inner wall surface of the cylinder liner facing the top ring also has a problem in that the wear is increased (accelerated).

As a piston ring for solving such a problem, a piston-top ring disclosed in Patent Document 2 is known.

[Patent Literature]

(Patent Document 1) Japanese Utility Model Publication No. 60-175850

(Patent Document 2) Japanese Published Patent Application No. Hei 7-504739

However, in the piston-top ring 4 disclosed in Patent Document 2, when viewed from the plane formed on the outer peripheral surface (sliding surface), the U-shaped or the V- So that the gas is blown. As a result, cracks are generated in the groove 15, the piston / saw / ring 4 is broken, and the piston / saw / ring 4 is worn, so that the depth of the groove 15 becomes small, There is a fear that the effect of blowing-in may not be obtained.

In the piston-top ring 4 disclosed in Patent Document 2, scratches are formed on the inner wall surface of the cylinder liner at the corners of the groove 15 formed in the outer peripheral surface (sliding surface), or wear-resistant coating is applied to the outer peripheral surface There is a fear that the abrasion-resistant coating will peel off from the corner of the groove 15.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a piston ring capable of reducing its own load by reducing its own load.

In order to solve the above problems, the present invention employs the following means.

A piston ring according to a first aspect of 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, And a gas passage for guiding the gas acting on one side surface to the other side is formed between the recessed portion and the recessed portion.

According to the piston ring according to the first aspect, the gas acting on one side is guided to the other side through the gas passage.

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

In the piston ring according to the first aspect, it is preferable that the gas passage is formed in the convex portion and / or the concave portion with a notch and / or a circumferential groove formed along the circumferential direction and / or between the convex portion and the concave portion Or may have a gap formed therebetween.

According to such a piston ring, even when the convex portion and the concave portion are in close contact with each other due to the pressure of the gas acting on one side, a gas passage for guiding the gas acting on one side to the other side is secured.

Thereby, the gas acting on one side can be guided to the other side regardless of the gap between the convex portion and the concave portion, and it becomes unnecessary to manage the gap formed between the convex portion and the concave portion.

In addition, for example, in the piston ring 81 shown in Fig. 8 and the like, the strength against the gas pressure applied to the upper surface is also advantageous.

The notch may be formed by a flat inclined surface or a curved surface connecting the inner peripheral edge of the intermediate horizontal surface forming the convex portion and the upper end of the intermediate inner peripheral surface forming the convex portion.

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 the productivity and workability can be improved, Can be reduced.

Since the circumferential groove is formed at a portion other than the sliding surface of the piston ring and the cylinder liner, no scratch is caused on the inner wall surface of the cylinder liner at the corner of the groove.

In the piston ring according to the above configuration, the peripheral groove is formed in a central portion in the thickness direction of the intermediate horizontal surface forming the recess, A second circumferential groove engraved on the side of the other side along the circumferential direction and having a rectangular shape when viewed in cross section at a central portion in the thickness direction of the intermediate horizontal surface forming the convex portion, .

According to such a piston ring (for example, the piston ring 151 shown in Fig. 22), the workability in machining the peripheral groove is the best, so productivity and workability can be improved, Can be reduced.

Since the circumferential groove is formed at a portion other than the sliding surface of the piston ring and the cylinder liner, no scratch is caused on the inner wall surface of the cylinder liner at the corner of the groove.

In the piston ring according to the above configuration, the gap formed between the convex portion and the concave portion may be set to be about 4 to 10 times as large as the gap in the piston ring having the conventional stepped joint.

According to such a piston ring, even if the piston ring is deformed by the pressure of the gas acting on one side, complete close contact between the convex portion and the concave portion is prevented (avoided), and the gas acting on one side is guided to the other side A gas passage is formed.

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

In the piston ring according to the first aspect, the overlap in the circumferential direction of the convex portion and the concave portion may be 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, overlapping in the circumferential direction of the convex portion and the concave portion is ensured, and a constant gas passage area can be ensured.

Thereby, even after the piston ring and the cylinder liner are worn, the load received by the piston ring and the cylinder liner can be reduced, and the wear of the piston ring and the cylinder liner can be reduced.

The piston ring set according to the second aspect of the present invention is provided with a piston ring having a piston ring and / or a tapered joint with any of the above piston rings and a right angle joint.

The piston ring set according to the second aspect may be configured to include only one of the piston rings.

According to the piston ring set related to the second aspect, since the lifetime of each piston ring coincides with (almost) simultaneously, the replacement time of the piston ring comes (almost) simultaneously, and therefore the maintenance property can be improved and the running cost can be reduced .

In the piston according to the third aspect of the present invention, the above-mentioned piston ring is sandwiched in the ring groove.

According to the piston according to the third aspect, since the lifetime of each piston ring coincides with (almost) simultaneously, and the replacement time of the piston ring comes (almost) simultaneously, the maintenance property can be improved and the running cost can be reduced .

An internal combustion engine according to a fourth aspect of the present invention comprises the piston ring set or the piston.

According to the internal combustion engine related to the fourth aspect, it is possible to reduce wear on the inner wall surface of the cylinder liner, to increase the life span of the cylinder liner (long life), and to reduce the running cost.

According to the piston ring of the present invention, it is possible to reduce the load on itself and to reduce the wear of the piston ring itself.

1 is a perspective view of a piston ring according to a first embodiment of the present invention.
Fig. 2 is an enlarged view of a portion surrounded by a chain double-dashed line in Fig. 1. Fig.
3 is a sectional view taken along the direction of arrow AA in Fig.
4 is an enlarged perspective view of the main portion of the piston ring according to the second embodiment of the present invention, and is the same view as Fig.
Fig. 5 is an enlarged perspective view of a main portion of a piston ring according to a third embodiment of the present invention, and is the same view as Fig. 3. Fig.
Fig. 6 is an enlarged perspective view of the main part of the piston ring according to the fourth embodiment of the present invention, and is the same view as Fig. 3;
Fig. 7 is an enlarged perspective view of a main portion of a piston ring according to a fifth embodiment of the present invention, and is the same view as Fig. 3;
Fig. 8 is an enlarged perspective view of the main portion of the piston ring according to the sixth embodiment of the present invention, and is the same view as Fig. 3. Fig.
9 is an enlarged perspective view of a main portion of a piston ring according to a seventh embodiment of the present invention, and is the same view as Fig.
10 is an enlarged perspective view of a main portion of a piston ring according to an eighth embodiment of the present invention, and is the same view as Fig.
11 is an enlarged perspective view of a main portion of a piston ring according to a ninth embodiment of the present invention, and is the same view as Fig.
Fig. 12 is an enlarged perspective view of a main portion of a piston ring according to a tenth embodiment of the present invention, and is the same view as Fig. 3. Fig.
Fig. 13 is an enlarged perspective view of a main portion of a piston ring according to an eleventh embodiment of the present invention, and is the same as Fig. 3;
Fig. 14 is an enlarged perspective view of a main portion of a piston ring according to a twelfth embodiment of the present invention, and is the same view as Fig. 3. Fig.
Fig. 15 is an enlarged perspective view of a main portion of a piston ring according to a thirteenth embodiment of the present invention, which is the same as Fig. 3;
Fig. 16 is an enlarged perspective view of a main portion of a piston ring according to a fourteenth embodiment of the present invention, which is the same as Fig. 3;
17 is an enlarged perspective view of a main portion of a piston ring according to a fifteenth embodiment of the present invention, and is the same view as Fig.
Fig. 18 is an enlarged perspective view of a main portion of a piston ring according to a sixteenth embodiment of the present invention, and is the same as Fig. 3;
Fig. 19 is an enlarged perspective view of a main portion of a piston ring according to a seventeenth embodiment of the present invention, which is the same as Fig. 3;
Fig. 20 is an enlarged perspective view of a main portion of a piston ring according to an eighteenth embodiment of the present invention, and is the same as Fig. 3;
21 is an enlarged perspective view of a main portion of a piston ring according to a nineteenth embodiment of the present invention, and is the same view as Fig.
Fig. 22 is an enlarged perspective view of a main portion of a piston ring according to a twentieth embodiment of the present invention, which is the same as Fig. 3;
23 is an enlarged perspective view of a main portion of a piston ring according to a twenty-first embodiment of the present invention, and is the same view as Fig.
Fig. 24 is an enlarged perspective view of a main portion of a piston ring according to a twenty-second embodiment of the present invention, which is the same as Fig. 3;
Fig. 25 is an enlarged perspective view of a main portion of a piston ring according to a twenty-third embodiment of the present invention, and is the same view as Fig. 3;
26 is a schematic sectional view around the combustion chamber of a large two-cycle marine diesel engine.
27 is a partial cross-sectional view in the vicinity of the piston ring mounting portion.
28 is an enlarged view of a joint of a piston ring having a stepped joint (gas tight joint).
29 is an enlarged view of a joint of a piston ring having a right angle joint.
30 is an enlarged view of a joint of a piston ring having an inclined joint.

[First Embodiment]

A piston ring according to a first embodiment of the present invention will now be described with reference to Figs. 1 to 3, 26, and 27. Fig.

Fig. 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, Fig. 3 is a cross- Fig. 27 is a partial sectional view of the vicinity of the piston ring mounting portion of the two-cycle diesel engine (hereinafter referred to as " diesel engine 1 ").

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

The cylinder head 12 shown in Fig. 26 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. [ In such a diesel engine 1, an exhaust valve 13 is formed 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).

Incidentally, the piston ring 21 according to the present embodiment is used as a piston ring (top ring) denoted by reference numeral 6 in Figs. 26 and 27, for example, and a stepped joint (gas tight joint) .

As shown in at least one of Figs. 1 to 3, the stepped joint 22 is provided with a convex portion (male portion) 23 and a concave portion (female portion) 24.

The convex portion 23 is a protruding member formed at one end of the piston ring 21 so as to extend along the circumferential direction and fit into the concave portion 24 and has an outer peripheral surface (sliding surface) 31, A middle inner peripheral surface 32, a first end surface 33, A middle horizontal surface 34, a second end surface 35, and a side surface (bottom surface: bottom surface) 36.

The outer circumferential surface 31 forms the same surface as the outer circumferential surface 41a of the portion other than the one end of the piston ring 21 (hereinafter referred to as the "piston ring body 41"), (A surface sliding against the inner wall surface 9a of the cylinder liner 9) together with the inner surface 41a.

The intermediate inner circumferential surface 32 is a horizontal surface located radially outward of the inner circumferential surface 41b of the piston ring body 41 and forming a surface facing the intermediate outer circumferential surface 51 forming the concave portion 24.

The first end face 33 is a vertical face forming a plane opposed to the end face 53 forming the concave portion 24 at the end (side) of one end of the piston ring 21.

The intermediate horizontal surface 34 is located on one side surface (top surface: top surface) 41c side of the middle in the height direction (width direction) of the piston ring body 41, (The upper surface 41c and the lower surface 41d) of the piston ring body 41. The horizontal surface of the piston ring main body 41 is parallel to the upper surface 41c and the lower surface 41d.

The second end face 35 is a curved face that smoothly connects the base end of the intermediate horizontal face 34 and the tip end of one side face (top face) 41c at the base end (side) of one end of the piston ring 21 .

The side surface (bottom surface: bottom surface) 36 is a horizontal surface that continuously forms the same surface as the other surface (bottom surface: bottom surface) 41d of the piston ring body 41.

The upper end of the first end face 33 and the distal end of the intermediate horizontal face 34 are connected by a flat inclined face 37 and the upper end of the intermediate horizontal face 34 and the upper end of the intermediate inner peripheral face 32 are curved faces 38, respectively.

The concave portion 24 is formed at the other end of the piston ring 21 so as to extend along the circumferential direction and to receive the convex portion 23 and has an intermediate outer circumferential surface 51 and an intermediate horizontal surface 52 , And an end surface (53).

The intermediate outer circumferential surface 51 is a horizontal surface located radially inward of the outer circumferential surface 41a of the piston ring body 41 and forming a surface facing the intermediate inner circumferential surface 32 forming the convex portion 23.

The intermediate horizontal surface 52 is located on one side surface (top surface: top surface) 41c side of the middle in the height direction (width direction) of the piston ring body 41, (The upper surface 41c and the lower surface 41d) of the piston ring body 41. The horizontal surface of the piston ring main body 41 is parallel to the upper surface 41c and the lower surface 41d.

The end face 53 is a vertical face forming a plane facing the first end face 33 forming the convex portion 23 at the base end (side) of the other end of the piston ring 21. [

The upper end of the end face 53 and the base end of the intermediate horizontal face 52 are connected by a curved face 54 and the upper end of the intermediate peripheral face 51 and the inner peripheral end of the intermediate horizontal face 52 are connected by a curved face 55, Respectively.

In the present embodiment, the gap g between the intermediate horizontal surface 34 and the intermediate horizontal surface 52, the gap g between the curved surface 38 and the curved surface 55, the intermediate inner circumferential surface 32, 51 of the gap (0.0 mm to 0.05 mm) in the piston ring R1 provided with the conventional stepped joint (gas tight joint) shown in Fig. 28 is about 4 to 10 times , That is, 0.0 mm <g? 0.5 mm.

The overlapping in the circumferential direction between 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, The length of the piston ring body 34 and the intermediate horizontal surface 52, the curved surface 38 and the curved surface 55 and the length of the intermediate inner circumferential surface 32 and the intermediate outer circumferential surface 51 overlapping (overlapping) (Width) (h) of the light emitting element 41. [

Even if the piston ring 21 is deformed by the pressure of the gas acting on the one side surface 41c of the piston ring 21 according to the present embodiment, the entirety of the convex portion 23 and the concave portion 24 The gas passage (gap g) for guiding the gas acting on the one side face 41c to the other side face 41d is secured.

As a result, the load received by itself can be reduced, and the wear of itself 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 of the main portion of the piston ring according to the present embodiment, and is the same view as Fig.

The piston ring 61 according to the present embodiment is different from the piston ring 61 according to the first embodiment in that a gas passage (communication passage) 62, 63 is formed instead of the gap g. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

The same members as those of the above-described first embodiment are denoted by the same reference numerals.

The gas passage 62 is formed in a central portion in the thickness direction of the intermediate horizontal surface 52 and engraved on one side (top surface: top surface) 41c side of the piston ring body 41 along the circumferential direction, (First end) indicating a square shape and having one end (tip end) thereof opened at the (line) end face 25 (see FIG. 2) of the other end, and the other end And is open at the other end of the piston ring main body 41 located at the side of the piston ring body 41 located on the side of the curved surface 54 than the other end of the piston ring main body 41 located at the other side.

The gas passage 63 is formed in the center portion in the height direction of the intermediate outer circumferential surface 51 in the circumferential direction with a circumferential groove And the other end of the piston ring body 41 is located radially inward of the inclined surface 37. The other end of the piston ring body 41 is located at the other end of the piston ring body 41, Or at the other end of the piston ring body 41 located on the side of the curved surface 54 than the inclined surface 37.

According to the piston ring 61 of the present embodiment, the gas acting on the one side surface 41c is led to the other side surface 41d through the gas passages 62 and 63. [

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

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 by the pressure of the gas acting on the one side surface 41c, The gas passages 62 and 63 for guiding the gas acting on the other side surface 41d are secured.

This makes it possible to guide the gas acting on the one side face 41c to the other side face 41d regardless of the gap between the convex portion 23 and the concave portion 24 so that the convex portion 23 and the concave portion 24, It is possible to eliminate the necessity of managing the gaps formed between the two.

[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 of the main portion of the piston ring according to the embodiment, and is the same view as Fig. 3. Fig.

The piston ring 66 according to the present embodiment is different from the piston ring 66 according to the second embodiment in that gas passages (communication passages) 67, 68 are formed instead of the gas passages (communication passages) . The other constituent elements are the same as those of the above-described embodiment, so that the description of the constituent elements is omitted here.

The same members as those in the above-described embodiment are denoted by the same reference numerals.

The gas passage 67 is formed at a central portion in the thickness direction of the intermediate horizontal surface 34 and is formed in a rectangular shape that is engraved on the side (bottom: bottom) 36 side along the circumferential direction, 2) peripheral groove, one end (leading end) of which is open to the inclined surface 37 and the other end (root end) of which is an intermediate horizontal surface 34 located below the (line) end face 25 (see FIG. 2) (See FIG. 2) side than the (line) end face 25 (see FIG.

The gas passage 68 is a peripheral groove engraved on the side of the outer peripheral surface 31 along the circumferential direction at the central portion in the height direction of the intermediate inner circumferential surface 32 and having a rectangular shape when seen in cross section, And the other end (base end) thereof is open to the first end face 33 and the intermediate inner circumferential face 32 or the (cross) end face 25 (see FIG. 2) positioned below the (line) end face 25 2), which is located on the side of 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 41c is led to the other side surface 41d through the gas passages 67 and 68. [

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

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 by the pressure of the gas acting on the one side surface 41c, The gas passages 67 and 68 for guiding the gas acting on the other side surface 41d are secured.

This makes it possible to guide the gas acting on the one side face 41c to the other side face 41d regardless of the gap between the convex portion 23 and the concave portion 24 so that the convex portion 23 and the concave portion 24, It is possible to eliminate the necessity of managing the gaps formed between the two.

[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 of the main portion of the piston ring according to the embodiment, and is the same view as Fig.

The piston ring 71 according to the present embodiment is configured such that the gas passages 62 and 63 described in the second embodiment and the gas passages 67 and 68 described in the third embodiment are formed Which is different from that of the first embodiment described above. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

According to the piston ring 71 according to the present embodiment, the gas acting on the one side surface 41c is led to the other side surface 41d through the gas passages 62, 63, 67 and 68. [

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

According to the piston ring 71 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are in close contact with each other by the pressure of the gas acting on the one side surface 41c, The gas passages 62, 63, 67, and 68 for guiding the gas acting on the other side surface 41d are secured.

This makes it possible to guide the gas acting on the one side face 41c to the other side face 41d regardless of the gap between the convex portion 23 and the concave portion 24 so that the convex portion 23 and the concave portion 24, It is possible to eliminate the necessity of managing the gaps formed between the two.

[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 of the main portion of the piston ring according to the present embodiment, and is the same view as Fig. 3. Fig.

The piston ring 76 according to the present embodiment has a gap g formed between the intermediate horizontal surface 34 and the intermediate horizontal surface 52 and a gap g between the curved surface 38 and the curved surface 55 The second embodiment is different from the first embodiment described above. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

The same members as those of the above-described first embodiment are denoted by the same reference numerals.

Even if the piston ring 76 is deformed by the pressure of the gas acting on the one side surface 41c of the piston ring 76 according to the present embodiment, the entirety of the convex portion 23 and the concave portion 24 The gas passage (gap g) for guiding the gas acting on the one side face 41c to the other side face 41d is secured.

As a result, the load received by itself can be reduced, and the wear of itself 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 of the main portion of the piston ring according to the present embodiment, and is the same view as Fig. 3. Fig.

The piston ring 81 according to the present embodiment has the gap g between the intermediate inner circumferential surface 32 and the intermediate outer circumferential surface 51 and the gap g between the curved surface 38 and the curved surface 55 The second embodiment is different from the first embodiment described above. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

The same members as those of the above-described first embodiment are denoted by the same reference numerals.

Even if the piston ring 81 is deformed by the pressure of the gas acting on the one side surface 41c of the piston ring 81 according to the present embodiment, the entirety of the convex portion 23 and the concave portion 24 The gas passage (gap g) for guiding the gas acting on the one side face 41c to the other side face 41d is secured.

As a result, the load received by itself can be reduced, and the wear of itself 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 of the main portion of the piston ring according to the embodiment, and is the same view as Fig. 3. Fig.

The piston ring 86 according to the present embodiment is different from the piston ring 86 according to the fifth and sixth embodiments described above in that the gap g described in the fifth embodiment and the gap g described in the sixth embodiment are formed. Which is different from that of the embodiment. The other constituent elements are the same as those of the fifth and sixth embodiments described above, so that the description of the constituent elements is omitted here.

9, a gap g (g) is 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, ), That is, has the same shape as that of the first embodiment.

Even if the piston ring 86 is deformed by the pressure of the gas acting on the one side face 41c of the piston ring 86 according to the present embodiment, the entirety of the convex portion 23 and the concave portion 24 The gas passage (gap g) for guiding the gas acting on the one side face 41c to the other side face 41d is secured.

As a result, the load received by itself can be reduced, and the wear of itself 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 of the main portion of the piston ring according to the present embodiment, and is the same view as Fig.

The piston ring 91 according to the present embodiment is different from the piston ring 91 according to the first embodiment in that a gas passage (communication path) 92, 93 is formed instead of the gap g. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

The same members as those of the above-described first embodiment are denoted by the same reference numerals.

The gas passage 92 is formed in a central portion in the thickness direction of the intermediate horizontal surface 52 and engraved on one side (top surface: top surface) 41c side of the piston ring body 41 along the circumferential direction, And the other end (base end) of the piston ring is located on the upper side of the inclined surface 37. The other end (tip end) And is opened at the other end of the main body 41 or at the other end of the piston ring body 41 located on the side of the curved surface 54 than the inclined surface 37.

The gas passage 93 is formed in the central portion in the height direction of the intermediate outer circumferential surface 51 in the circumferential direction so as to be engaged with the peripheral surface 41b side of the piston ring body 41, And the other end of the piston ring body 41 is located radially inward of the inclined surface 37. The other end of the piston ring body 41 is located at the other end of the piston ring body 41, Or at the other end of the piston ring body 41 located on the side of 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. [

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

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 by the pressure of the gas acting on the one side surface 41c, The gas passages 92 and 93 for guiding the gas acting on the other side surface 41d are secured.

This makes it possible to guide the gas acting on the one side face 41c to the other side face 41d regardless of the gap between the convex portion 23 and the concave portion 24 so that the convex portion 23 and the concave portion 24, It is possible to eliminate the necessity of managing the gaps formed between the two.

[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 of the main portion of the piston ring according to the present embodiment, and is the same view as Fig. 3. Fig.

The piston ring 96 according to the present embodiment is different from the piston ring 96 according to the eighth embodiment in that gas passages (communication passages) 97 and 98 are formed instead of the gas passages . Other constituent elements are the same as those of the above-described embodiment, so that the description of the constituent elements is omitted here.

The same members as those in the above-described embodiment are denoted by the same reference numerals.

The gas passage 97 is a circumferential groove engraved on the side of the side surface (lower surface: bottom surface) 36 along the circumferential direction at the central portion in the thickness direction of the intermediate horizontal surface 34, , The other end (base end) thereof is open to the inclined plane 37 and the other end (base end) is the intermediate horizontal plane 34 or the (horizontal) plane (lower plane) located below the (line) 25) (see Fig. 2), which is located on the side of the curved surface 35 (see Fig. 2).

The gas passage 98 is a peripheral groove engraved on the outer peripheral surface 31 side along the circumferential direction at the central portion in the height direction of the intermediate inner circumferential surface 32 and showing a semicircular shape when viewed in section, And the other end (base end) thereof is open to the first end face 33 and the intermediate inner circumferential face 32 or the (cross) end face 25 (see FIG. 2) positioned below the (line) end face 25 2), which is located on the side of the curved surface 35 (see Fig. 2).

According to the piston ring 96 according to the present embodiment, the gas acting on the one side surface 41c is led to the other side surface 41d through the gas passages 97 and 98. [

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

According to the piston ring 96 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are closely contacted by the gas pressure acting on the one side surface 41c, The gas passages 97 and 98 for guiding the gas acting on the other side 41d are secured.

This makes it possible to guide the gas acting on the one side face 41c to the other side face 41d regardless of the gap between the convex portion 23 and the concave portion 24 so that the convex portion 23 and the concave portion 24, It is possible to eliminate the necessity of managing the gaps formed between the two.

[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 of the main portion of the piston ring according to the present embodiment, and is the same view as Fig. 3. Fig.

The piston ring 101 according to the present embodiment is different from the piston ring 101 according to the first embodiment in that the gas passages (communication passages) 92 and 93 described in the eighth embodiment and the gas passages (communicating passages) 97 and 98 described in the ninth embodiment are formed Which is different from that of the first embodiment described above. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

According to the piston ring 101 according to the present embodiment, the gas acting on the one side surface 41c is led to the other side surface 41d through the gas passages 92, 93, 97 and 98. [

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

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 by the pressure of the gas acting on the one side surface 41c, The gas passages 92, 93, 97 and 98 for guiding the gas acting on the other side surface 41d are secured.

This makes it possible to guide the gas acting on the one side face 41c to the other side face 41d regardless of the gap between the convex portion 23 and the concave portion 24 so that the convex portion 23 and the concave portion 24, It is possible to eliminate the necessity of managing the gaps formed between the two.

[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 of the main portion of the piston ring according to the embodiment, and is the same view as Fig. 3. Fig.

The piston ring 106 according to the present embodiment is different from the piston ring 106 according to the first embodiment in that gas passages (communication passages) 107 and 108 are formed instead of the gap g. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

The same members as those of the above-described first embodiment are denoted by the same reference numerals.

The gas passage 107 is formed in a central portion in the thickness direction of the intermediate horizontal surface 52 and engraved on one side (top surface: top surface) 41c side of the piston ring body 41 along the circumferential direction, 2) of the other end, and the other end (base end) of the other end is connected to the inclined surface 37 (see FIG. 2) Or the other end of the piston ring body 41 located on the side of the curved surface 54 than the inclined surface 37. The other end of the piston ring body 41,

The gas passage 108 is formed in the center portion in the height direction of the intermediate outer circumferential surface 51 in a triangular shape as viewed in cross section And the other end (base end) is formed in the radially inner side of the inclined surface 37 (see FIG. 2), and the other end And is open at the other end of the piston ring main body 41 located at the side of the piston ring body 41 located on the side of the curved surface 54 than the other end of the piston ring main body 41 located at the other side.

According to the piston ring 106 according to the present embodiment, the gas acting on the one side surface 41c is led to the other side surface 41d through the gas passages 107,

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

According to the piston ring 106 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 passages 107 and 108 for guiding the gas acting on the other side surface 41d are secured.

This makes it possible to guide the gas acting on the one side face 41c to the other side face 41d regardless of the gap between the convex portion 23 and the concave portion 24 so that the convex portion 23 and the concave portion 24, It is possible to eliminate the necessity of managing the gaps formed between the two.

[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 of the main portion of the piston ring according to the embodiment, and is the same view as Fig. 3. Fig.

The piston ring 111 according to the present embodiment is different from the piston ring 111 according to the eleventh embodiment in that gas passages (communication passages) 112 and 113 are formed instead of the gas passages (communication passages) . Other constituent elements are the same as those of the above-described embodiment, so that the description of the constituent elements is omitted here.

The same members as those in the above-described embodiment are denoted by the same reference numerals.

The gas passage 112 is formed in a triangular shape (in this embodiment, an equilateral triangle (in the present embodiment, a triangle The other end (base end) of the intermediate horizontal surface 34 is located on the lower side of the (line) end surface 25 (see Fig. 2) Or the intermediate horizontal surface 34 located on the side of the curved surface 35 (see FIG. 2) than the (line) surface 25 (see FIG. 2).

The gas passage 113 is formed in the central portion in the height direction of the intermediate inner circumferential surface 32 in the circumferential direction so as to have a circumferential groove 31 which is engraved on the outer circumferential surface 31 side and has a triangular shape (a regular triangle in this embodiment) And the other end (base end) is a middle inner circumferential surface 32 positioned below the (line) end face 25 (see FIG. 2) (See Fig. 2) than the end face 25 (see Fig.

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. [

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

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 by the pressure of the gas acting on the one side surface 41c, The gas passages 112 and 113 for guiding the gas acting on the other side surface 41d are secured.

This makes it possible to guide the gas acting on the one side face 41c to the other side face 41d regardless of the gap between the convex portion 23 and the concave portion 24 so that the convex portion 23 and the concave portion 24, It is possible to eliminate the necessity of managing the gaps formed between the two.

[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 of the main portion of the piston ring according to the embodiment, and is the same view as Fig.

The piston ring 116 according to the present embodiment has 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 Which is different from that of the first embodiment described above. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

According to the piston ring 116 according to the present embodiment, the gas acting on the one side surface 41c is led to the other side surface 41d through the gas passages 107, 108, 112, and 113. [

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

According to the piston ring 116 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are closely contacted by the pressure of the gas acting on the one side surface 41c, The gas passages 107, 108, 112 and 113 for guiding the gas acting on the other side surface 41d are secured.

This makes it possible to guide the gas acting on the one side face 41c to the other side face 41d regardless of the gap between the convex portion 23 and the concave portion 24 so that the convex portion 23 and the concave portion 24, It is possible to eliminate the necessity of managing the gaps formed between the two.

[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 of the main portion of the piston ring according to the present embodiment, and is the same view as Fig. 3. Fig.

The piston ring 121 according to the present embodiment is different from the piston ring 121 according to the first embodiment in that a notch 122 is formed instead of the gap g. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

The same members as those of the above-described first embodiment are denoted by the same reference numerals.

The notch 122 is formed by a flat inclined surface or a curved surface connecting the inner circumferential end of the intermediate horizontal surface 34 and the upper end of the intermediate inner circumferential surface 32. One end (tip end) extends to the inclined surface 37, (Base end) extends downward to a point located on the curved surface 35 (see Fig. 2) side than the (line) end surface 25 (see Fig. 2) Extended.

The gas acting on the one side surface 41c of the piston ring 121 according to the present embodiment is formed in a gap (gas passage) formed between the inclined surface or the curved surface forming the notch 122 and the concave portion 24, And is guided to the other side surface 41d.

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

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, (Gas passage) for guiding the gas acting on the other side 41d to the other side 41d.

This makes it possible to guide the gas acting on the one side face 41c to the other side face 41d regardless of the gap between the convex portion 23 and the concave portion 24 so that the convex portion 23 and the concave portion 24, It is possible to eliminate the necessity of managing the gaps formed between the two.

[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 of the main portion of the piston ring according to the present embodiment, and is the same view as Fig. 3. Fig.

The piston ring 126 according to the present embodiment is different from the piston ring 126 according to the first embodiment in that a notch 127 is formed instead of the gap g. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

The same members as those of the above-described first embodiment are denoted by the same reference numerals.

The notch 127 is formed by a flat inclined surface or a curved surface connecting the lower end of the intermediate inner circumferential surface 32 and the inner circumferential end of the side surface 36. One end (tip end) of the notch 127 extends to the first end surface 33 , And the other end (base end) is located on the side of the curved surface 35 (see Fig. 2) than the (line) end face 25 (see Fig. 2) It extends to the point.

According to the piston ring 126 of the present embodiment, the gas acting on one side surface 41c passes through a gap (gas passage) formed between the inclined surface forming the notch 127 and the recessed portion 24 And is guided to the side surface 41d.

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

According to the piston ring 126 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are closely contacted by the gas pressure acting on the one side surface 41c, (Gas passage) for guiding the gas acting on the other side 41d to the other side 41d.

This makes it possible to guide the gas acting on the one side face 41c to the other side face 41d regardless of the gap between the convex portion 23 and the concave portion 24 so that the convex portion 23 and the concave portion 24, It is possible to eliminate the necessity of managing the gaps formed between the two.

[Sixteenth Embodiment]

A piston ring according to a sixteenth embodiment of the present invention will be described with reference to Fig. 18 is an enlarged perspective view of the main portion of the piston ring according to the present embodiment, and is the same view as Fig.

The piston ring 131 according to the present embodiment differs from the piston ring 131 according to the first embodiment in that the notch 122 described in the fourteenth embodiment and the notch 127 described in the fifteenth embodiment are formed Do. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

The gas acting on the one side surface 41c of the piston ring 131 according to the present embodiment is guided by the inclined surface or curved surface forming the notch 122 and the gap (gas passage) formed between the recessed portion 24, And a gap (gas passage) formed between the concave portion 24 and the inclined surface or curved surface forming the notch 127 and the other side surface 41d.

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

According to the piston ring 131 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are closely contacted by the pressure of the gas acting on the one side surface 41c, (Gas passage) for guiding the gas acting on the other side 41d to the other side 41d.

This makes it possible to guide the gas acting on the one side face 41c to the other side face 41d regardless of the gap between the convex portion 23 and the concave portion 24 so that the convex portion 23 and the concave portion 24, It is possible to eliminate the necessity of managing the gaps formed between the two.

[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 of the main portion of the piston ring according to the present embodiment, and is the same as Fig. 3.

The piston ring 136 according to the present embodiment is different from the piston ring 136 according to the first embodiment in that a gas passage (communication passage) 137 is formed instead of the gap g. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

The same members as those of the above-described first embodiment are denoted by the same reference numerals.

The gas passage 137 connects the inner circumferential edge of the intermediate horizontal surface 52 and the upper end of the intermediate outer circumferential surface 51 and connects one side surface (top surface: top surface) 41c of the piston ring main body 41 along the circumferential direction (Front end) is opened at the (line) end face 25 (see Fig. 2) of the other end, and the other end The other end (base end) of the piston ring body 41 is located at the other end of the piston ring body 41 located above the inclined surface 37 or at the other end of the piston ring body 41 located on the curved surface 54 side of the inclined surface 37 And is opened.

According to the piston ring 136 according to the present embodiment, the gas acting on the one side surface 41c is led to the other side surface 41d through the gas passage 137. [

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

According to the piston ring 136 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are closely contacted by the gas pressure acting on the one side surface 41c, The gas passage 137 for guiding the gas acting on the other side surface 41d is secured.

This makes it possible to guide the gas acting on the one side face 41c to the other side face 41d regardless of the gap between the convex portion 23 and the concave portion 24 so that the convex portion 23 and the concave portion 24, It is possible to eliminate the necessity of managing the gaps formed between the two.

[Eighteenth Embodiment]

A piston ring according to an eighteenth embodiment of the present invention will be described with reference to Fig. 20 is an enlarged perspective view of the main portion of the piston ring according to the present embodiment, and is the same view as Fig.

The piston ring 141 according to the present embodiment is different from the piston ring 141 according to the first embodiment in that a notch 142 is formed instead of the gap g. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

The same members as those of the above-described first embodiment are denoted by the same reference numerals.

The notch 142 is formed by a flat inclined surface or a curved surface connecting the lower end of the intermediate outer circumferential surface 51 and the outer circumferential end of the other side (lower surface: bottom surface) 41d at the other end of the piston ring body 41 And the other end (base end) extends radially inward of the first end face 33 or the other end (radial direction) of the first end face 33, And extends to a point located on the side of the end surface (53) than the end surface (33).

The gas acting on the one side surface 41c of the piston ring 141 according to the present embodiment is formed into a gap (gas passage) formed between the inclined surface or the curved surface forming the notch 142 and the concave portion 24, And is guided to the other side surface 41d.

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

According to the piston ring 141 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are closely contacted by the gas pressure acting on the one side surface 41c, (Gas passage) for guiding the gas acting on the other side 41d to the other side 41d.

This makes it possible to guide the gas acting on the one side face 41c to the other side face 41d regardless of the gap between the convex portion 23 and the concave portion 24 so that the convex portion 23 and the concave portion 24, It is possible to eliminate the necessity of managing the gaps formed between the two.

[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 of the main portion of the piston ring according to the present embodiment, and is the same view as Fig. 3. Fig.

The piston ring 146 according to the present embodiment is different from the piston ring 146 according to 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 formed. It is different. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

The operation and effect of this embodiment are the same as those of the seventeenth embodiment and the eighteenth embodiment, and therefore, the description thereof is omitted here.

[Twentieth 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 of the main portion of the piston ring according to the present embodiment, and is the same view as Fig.

The piston ring 151 according to the present embodiment is different from the piston ring 151 according to the first embodiment in that the gas passage 62 described in the second embodiment and the gas passage 67 described in the third embodiment are formed. . The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

According to the piston ring 151 according to the present embodiment, the gas acting on the one side surface 41c is led to the other side surface 41d through the gas passages 62 and 67. [

As a result, the load received by itself can be reduced, and the wear of itself can be reduced.

According to the piston ring 151 according to the present embodiment, even when the convex portion 23 and the concave portion 24 are closely contacted by the pressure of the gas acting on the one side surface 41c, The gas passages 62 and 67 for guiding the gas acting on the other side surface 41d are secured.

This makes it possible to guide the gas acting on the one side face 41c to the other side face 41d regardless of the gap between the convex portion 23 and the concave portion 24 so that the convex portion 23 and the concave portion 24, It is possible to eliminate the necessity of managing the gaps formed between the two.

[Twenty-first Embodiment]

A piston ring according to a twenty-first embodiment of the present invention will be described with reference to Fig. 23 is an enlarged perspective view of the main portion of the piston ring according to the present embodiment, and is the same view as Fig.

The piston ring 156 according to the present embodiment is different from the piston ring 156 according to 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 formed. It is different. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

Since the operation and effect of the present embodiment are the same as those of 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 of the main portion of the piston ring according to the present embodiment, and is the same view as Fig.

The piston ring 161 according to the present embodiment differs from the piston ring 161 according to the first embodiment in that the notch 127 described in the fifteenth embodiment and the notch 142 described in the eighteenth embodiment are formed. Do. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

Since the operation and effect of the present embodiment are the same as those of 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 of the main portion of the piston ring according to the present embodiment, and is the same view as Fig. 3. Fig.

The piston ring 166 according to the present 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, 18 is different from that of the first embodiment in that the notch 142 described in the 18th embodiment is formed. The other constituent elements are the same as those of the first embodiment described above, so that the description of the constituent elements is omitted here.

The operation and effect of the present embodiment are the same as those of the fourteenth, fifteenth, seventeenth, and eighteenth embodiments, and a description thereof will be omitted herein.

In addition, in the above-described embodiment, the machinability in machining the notch is the most excellent in the fourteenth embodiment shown in Fig. 16, 20 embodiment.

The present invention is not limited to the above-described embodiment, but it is also possible to combine the above-described embodiments appropriately in accordance with necessity, or to modify and modify the above-described embodiments appropriately as necessary.

In addition to being used as a top ring, the piston ring according to the present invention can also be used for a piston ring of a second stage or later (a piston ring after a second ring).

Furthermore, although the piston 2 having three ring grooves 3, 4, 5 formed in the height direction has been described as one specific example in the above-described embodiment, the piston according to the present invention is not limited thereto , And one, two, or four or more ring grooves may be 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: Short stitches
23:
24:
32: Middle inner peripheral surface
34: Medium horizontal plane
51: middle outer circumferential surface
52: intermediate horizontal plane
61: Piston ring
62: (first) peripheral groove (gas passage)
63: circumferential groove (gas passage)
66: Piston ring
67: (second) peripheral 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: Height (width) of the piston ring

Claims (8)

There is provided a piston ring having a convex portion at one end and a concave portion at the other end and forming a stepped joint by the convex portion and the concave portion,
A gas passage for guiding gas acting on one side face 41c to the other side face 41d is formed between the convex portion 23 and the concave portion 24 along the circumferential direction,
The gas passage,
A notch 127 formed by a flat inclined surface or a curved surface connecting the lower end of the intermediate inner circumferential surface 32 of the convex portion 23 to the inner circumferential end of the other side surface 36, A gap formed along the circumferential direction, and
A notch 142 formed by a flat inclined surface or a curved surface connecting the lower end of the intermediate outer circumferential surface 51 of the concave portion 24 to the outer circumferential end of the other surface 41d at the other end, (23), and a gap formed along the circumferential direction,
One end of the notch 127 extends to the first end face 33 of the convex portion 23 and the other end of the notch 127 extends to the side of the second end face 35 of the convex portion 23 Extending to a point where it is located,
One end of the notch 142 extends to the lower side of the front end face 25 of the concave portion 24 and the other end of the notch 142 is positioned on the end face 53 side of the concave portion 24 Extended to the point where The piston ring. The method according to claim 1,
Wherein the overlapping in the circumferential direction of the convex portion and the concave portion is set to be about two to four times the height of the piston ring. A piston ring set having a plurality of piston rings mounted to one piston,
A piston ring according to any one of claims 1 to 3,
A piston ring set comprising a piston ring having at least one of a piston ring with a right angle joint and an angled joint. A set of piston rings having a plurality of piston rings mounted to one piston, wherein each of the plurality of piston rings is the piston ring according to any one of claims 1 or 2. A piston in which the piston ring according to claim 1 or 2 is fitted in a ring groove. An internal combustion engine comprising the piston ring set according to claim 3. An internal combustion engine comprising the piston ring set according to claim 4. An internal combustion engine comprising the piston according to claim 5.

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