CN112459919A - Piston ring and preparation method thereof - Google Patents

Piston ring and preparation method thereof Download PDF

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Publication number
CN112459919A
CN112459919A CN202011320978.8A CN202011320978A CN112459919A CN 112459919 A CN112459919 A CN 112459919A CN 202011320978 A CN202011320978 A CN 202011320978A CN 112459919 A CN112459919 A CN 112459919A
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CN
China
Prior art keywords
piston ring
piston
ring
split body
split
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Pending
Application number
CN202011320978.8A
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Chinese (zh)
Inventor
苏雷虹
顾德
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Chongqing Hailanxing Technology Co ltd
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Chongqing Hailanxing Technology Co ltd
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Publication of CN112459919A publication Critical patent/CN112459919A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/06—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging
    • F16J9/061—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging using metallic coiled or blade springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/14—Joint-closures
    • F16J9/16—Joint-closures obtained by stacking of rings

Abstract

The invention provides a piston ring and a preparation method thereof, the piston ring is used for replacing a sealing ring, an oil ring and a retainer ring of a standard piston assembly, the piston ring is of an annular structure formed by enclosing a plurality of split bodies, and each split body is prepared by adopting a powder metallurgy process. The preparation method of the piston ring comprises the following steps: pressing the alloy powder into a powder with a density of 6.8-7.1 g/cm3A preform ofAnd (3) placing the preformed blank in a sintering furnace with a protective gas atmosphere for sintering, and cooling and forming, wherein the sintering temperature is controlled to be 1100-1200 ℃. The piston ring with high precision, excellent high temperature resistance and excellent wear resistance is prepared by a simple process, and meets the high precision requirement of a piston assembly.

Description

Piston ring and preparation method thereof
Technical Field
The invention relates to a piston assembly, in particular to a piston ring and a preparation method thereof.
Background
The existing standard piston assembly mainly comprises a piston and a sealing ring, an oil ring and a retainer ring which are matched with the piston, wherein the sealing ring, the oil ring and the retainer ring are respectively and independently arranged in a ring groove of the piston.
Document CN209011961U discloses a split engine piston, comprising: the piston comprises a piston cover, a piston body, a piston groove body, a piston ring, an oil ring groove, an oil ring, an axle hole, a screw, a combustion chamber, an oil hole, a positioning table, a clamp spring groove, a threaded hole and a screw hole, wherein the oil ring groove is arranged at the upper part of the side surface of the piston body, the oil ring is arranged in the oil ring groove, the oil hole is formed in the inner edge and the lower edge of the oil ring groove, and the oil; the piston body is provided with a shaft hole, a clamp spring groove is arranged in the shaft hole, and the piston body is provided with a positioning table which is cylindrical; the edge above the piston body is equipped with the screw hole, the piston lid is equipped with above the piston body, the piston lid upper surface is equipped with the combustion chamber, piston lid upper surface edge is equipped with the screw hole, the piston lid side is equipped with the piston groove body, the piston ring is equipped with in the piston groove body, piston lid lower surface is equipped with the locating hole, the locating hole is the cylinder hole, the piston lid passes through the locating hole and the location platform location transition fit above the piston body, the piston lid passes through the screw in the screw hole and couples together with the piston. However, the piston ring has the technical problems of high processing difficulty, easy abrasion and air leakage of the piston ring, short service life and the like in the using process.
In addition, document CN2731185Y discloses a ring-closed piston, in which the ring body is formed by combining a plurality of arc-shaped steel rings along the circumference, the adjacent arc-shaped steel rings are in sliding fit and the contact surfaces are all inclined surfaces, and the ring body is integrally embedded in the piston ring groove. However, the ring-closing piston has poor stability during use, and air leakage is also the case. More importantly, the ring-closing piston must fix the spring by means of the positioning pin, and the positioning pin is limited by the narrow moving space of the piston ring, so that the difficulty of installing or machining the positioning pin is quite large, and the precision requirement of the piston assembly is difficult to ensure.
Disclosure of Invention
In view of the problems in the background art, the present invention aims to provide a piston ring and a method for preparing the same.
In order to achieve the above purpose, the present invention adopts the following technical solutions.
A piston ring, characterized in that: the piston ring is used for replacing a sealing ring, an oil ring and a retainer ring of a standard piston assembly, is of an annular structure formed by enclosing a plurality of split bodies, and is prepared by adopting a powder metallurgy process for each split body.
In order to improve the high-temperature resistance and the wear resistance of the piston ring, the piston ring comprises, by mass, 0.2-2% of C, 0.5-2.5% of Cu, 0.5-2.5% of Mo, 0.5-2.5% of Ni and 0.3-0.8% of Cr.
Preferably, the piston ring is made of a raw material comprising 0.2 to 2% by mass of C, 0.5 to 2.5% by mass of Cu, 0.5 to 2% by mass of Mo, 0.5 to 2.5% by mass of Ni, 0.3 to 0.8% by mass of Cr, and inevitable impurities.
Further, the internal wall of the split body is used for leaning against the piston, the external wall of the split body is used for leaning against the internal wall of the cylinder body of the cylinder, an inner concave part is arranged on the internal wall of the split body, and the inner concave part is used for accommodating one end part of the elastic element.
In order to further improve the oil control performance and flexibility of the piston, an oil groove is formed in the end portion of the split body.
Preferably, the concave part adopts a notch or a blind hole.
For better preventing air leakage, the adjacent segments are mutually inserted, lapped or buckled.
For the accuse oil performance and the flexibility of further improvement piston, the oil groove is radial to be arranged, and the oil groove extends to the split body outer wall from the split body inner wall.
For preventing the piston ring swing, further improve piston assembly's stability, flexibility, set up slottedly in the external wall hoop of split body, enclose synthetic annular by the groove of all split bodies jointly.
The preparation method of the piston ring provided by the invention comprises the following steps: pressing the alloy powder into a powder with a density of 6.8-7.1 g/cm3The method comprises the following steps of (1) pre-forming a split blank, placing the pre-formed split blank in a sintering furnace with a protective gas atmosphere for sintering, and cooling and forming to obtain the split forming the piston ring, wherein the sintering temperature is controlled to be 1100-1200 ℃.
The piston ring and the preparation method thereof provided by the invention have the following beneficial effects:
(1) the piston ring with high precision, excellent high temperature resistance and excellent wear resistance is prepared by a simple process, and meets the high precision requirement of a piston assembly;
(2) the split piston ring is adopted to replace a sealing ring, a retainer ring and an oil ring of the existing piston structure, the sealing ring, the oil ring and the retainer ring are integrated into an integrated structure, and compared with the sealing ring, the retainer ring and the oil ring, the split piston ring is equivalent to an integrated piston ring, and the structure is more compact;
(3) so that the pressure of the piston ring on the inner wall of the cylinder body of the cylinder is uniform and controllable;
(4) no gas leakage exists in the axial direction in the operation process;
(5) the wear resistance and the wetting quality are excellent, the oil control performance is good, the stability is good, and no swing exists in the operation process;
(6) the piston body is light in weight, and the length of the piston body can be reduced as much as possible;
(7) the structure is simple, the cost is low, and the processing difficulty is small;
(8) the service life is long, and linear compensation can be realized for the abrasion part.
Drawings
FIG. 1 is a schematic view of a piston ring segment in accordance with embodiment 1;
FIG. 2 is a schematic view showing a piston ring segment in embodiment 2;
FIG. 3 is a schematic view showing a piston ring segment in embodiment 3;
FIG. 4 is a fragmentary view showing the piston ring in accordance with embodiment 4;
FIG. 5 is a side view of a piston ring segment according to embodiment 1-3;
FIG. 6 is a side view of a piston ring segment according to embodiment 5-8;
FIG. 7 is a schematic view of a piston ring assembly according to embodiment 1;
FIG. 8 is a schematic view showing a state where the piston ring assembly is fitted to the cylinder in embodiment 1;
FIG. 9 is a schematic piston view of a piston ring assembly in accordance with embodiment 1;
FIG. 10 is a schematic view of the elastic member of the piston ring assembly in embodiment 1;
fig. 11 is a partial schematic view of a piston ring according to another embodiment.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings and embodiments, which are only a part of the embodiments of the present invention, but not all of them. In the description of the present invention, it is to be noted that the terms "inside" and "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or component must have a specific orientation, be constructed and operated in a specific orientation, and cannot be construed as limiting the present invention.
Example 1
A piston ring, as shown in figure 1 (figure 1 only shows a split body 11 schematically), is a ring structure enclosed by three split bodies 11, the inner wall of the split body 11 is attached to a piston, the outer wall of the split body 11 is attached to the inner wall of a cylinder body of a cylinder, an inner concave part 13 is arranged on the inner wall of the split body 11, and the inner concave part 13 is used for accommodating one end part of an elastic element 3. Wherein: a plurality of oil grooves 12 are arranged at the top of the split body 11 (the upper end in fig. 1), the oil grooves 12 are arc-shaped grooves, the oil grooves 12 are radially arranged, and the oil grooves 12 extend from the inner wall of the split body 11 to the outer wall of the split body 11; the concave part 13 adopts a notch; the adjacent split bodies 11 are overlapped, specifically, a first step 14 is arranged on one side of each split body 11 along the lower part, the first step 14 is arranged upwards, a second step 15 is arranged on the other side of each split body along the lower part, the second step 15 is arranged downwards, and the second step 15 of one split body 11 is attached to the first step 14 of the other split body 11 to realize the overlapping connection of the adjacent split bodies; the outer wall of the split body 11 is annularly provided with a groove 16, the grooves 16 of all the split bodies 11 jointly enclose a ring groove, and in the use process, the outer wall of the split body 11 at the upper part of the ring groove and the lower part of the ring groove is used for clinging to the inner wall of the cylinder body of the cylinder. The side view of the body 11 is shown in fig. 5, where the outer wall of the body 11 at the top and bottom of the groove 16 has a slope and the oil groove 12 is located above the slope.
For the piston ring in the embodiment, the preparation method comprises the following steps: according to the formula "C: 0.5 percent of Cu, 1.5 percent of Mo, 1.5 percent of Ni and 0.5 percent of Cr, wherein the percentages are mass percent for preparing alloy powder; pressing the alloy powder to a density of 7g/cm3The preformed split body blank is placed in a sintering furnace with protective gas atmosphere for sintering, the sintering temperature is controlled to be 1150 ℃, and three split bodies forming the piston ring are obtained through cooling forming.
Example 2
A piston ring is shown in figures 2 and 5 and is of an annular structure formed by enclosing three split bodies 11, wherein the inner walls of the split bodies 11 are attached to a piston, the outer walls of the split bodies 11 are attached to the inner wall of a cylinder body of a cylinder, an inner concave part 13 is arranged on the inner wall of the split body 11, and the inner concave part 13 is used for accommodating one end part of an elastic element 3. Wherein: the top of the split body 11 is provided with a plurality of oil grooves 12, the oil grooves 12 are arc-shaped grooves, the oil grooves 12 are radially arranged, and the oil grooves 12 extend from the inner wall of the split body 11 to the outer wall of the split body 11; the concave part 13 adopts a notch; the adjacent split bodies 11 are overlapped, specifically, a first step 14 is arranged on one side of each split body 11 along the lower portion, the first step 14 is arranged upwards, a second step 15 is arranged on the other side of each split body along the lower portion, the second step 15 is arranged downwards, and the second step 15 of one split body 11 is attached to the first step 14 of the other split body 11 to realize the overlapping connection of the adjacent split bodies.
For the piston ring in the embodiment, the preparation method comprises the following steps: according to the formula "C: 0.2 percent of Cu, 2 percent of Mo, 0.5 percent of Ni and 0.3 percent of Cr, wherein the percentages are mass percent for preparing alloy powder; pressing the alloy powder to a density of 6.8g/cm3The preformed split body blank is placed in a sintering furnace with protective gas atmosphere for sintering, the sintering temperature is controlled to be 1100 ℃, and three split bodies forming the piston ring are obtained through cooling forming.
Example 3
A piston ring, as shown in fig. 3 with reference to embodiment 1, which is different from embodiment 1 in that: the concave portion 13 is a circular blind hole.
For the piston ring in the embodiment, the preparation method comprises the following steps: according to the formula "C: 2 percent of Cu, 2.5 percent of Mo, 2 percent of Ni and 0.8 percent of Cr, wherein the percentages are mass percent for preparing alloy powder; pressing the alloy powder to a density of 6.8g/cm3The preformed split body blank is placed in a sintering furnace with a protective gas atmosphere for sintering, the sintering temperature is controlled to be 1200 ℃, and a plurality of split bodies forming the piston ring are obtained through cooling forming.
Example 4
A piston ring, as shown in fig. 4 (fig. 4 only shows a split body 11 schematically), is a ring structure enclosed by three split bodies 11, the inner wall of the split body 11 is attached to a piston, the outer wall of the split body 11 is attached to the inner wall of a cylinder body of a cylinder, and an inner concave portion 13 is arranged on the inner wall of the split body 11, and the inner concave portion 13 is used for accommodating one end portion of an elastic element 3. Wherein: the concave part 13 adopts a round blind hole; the adjacent split bodies 11 are overlapped, specifically, a first step 14 is arranged on one side of each split body 11 along the lower part, the first step 14 is arranged upwards, a second step 15 is arranged on the other side of each split body along the lower part, the second step 15 is arranged downwards, and the second step 15 of one split body 11 is attached to the first step 14 of the other split body 11 to realize the overlapping connection of the adjacent split bodies; the outer wall of the split body 11 is annularly provided with a groove 16, the grooves 16 of all the split bodies 11 jointly enclose a ring groove, and in the use process, the outer wall of the split body 11 at the upper part of the ring groove and the lower part of the ring groove is used for clinging to the inner wall of the cylinder body of the cylinder.
For the piston ring in this embodiment, its preparationThe method comprises the following steps: according to the formula "C: 0.2 percent of Cu, 0.5 percent of Mo, 0.5 percent of Ni and 0.7 percent of Cr, wherein the percentages are mass percent for preparing alloy powder; pressing the alloy powder to a density of 7.1g/cm3The preformed split body blank is placed in a sintering furnace with a protective gas atmosphere for sintering, the sintering temperature is controlled to be 1200 ℃, and a plurality of split bodies forming the piston ring are obtained through cooling forming.
Examples 5 to 7
A piston ring according to any one of embodiments 1 to 3 in combination with fig. 6, which differs from the embodiments 1 to 3 in that: the outer wall of the segment 11 at the top and bottom of the groove 16 has a slope, and the bottom of the oil groove 12 and the top of the slope are located at the same level.
For the piston rings of examples 5-7, the preparation method comprises the following steps: according to the formula "C: 0.7 percent of Cu, 1 percent of Mo, 1 percent of Ni and 0.7 percent of Cr, wherein the percentages are mass percent for preparing alloy powder; pressing the alloy powder to a density of 6.9g/cm3The preformed split body blank is placed in a sintering furnace with a protective gas atmosphere for sintering, the sintering temperature is controlled to be 1130 ℃, and a plurality of split bodies forming the piston ring are obtained through cooling forming.
Example 8
As shown in fig. 7 to 9, a piston assembly is composed of three segments 11 (the three segments jointly enclose a piston ring 1), three elastic elements 3 and a piston 2, wherein each segment 11 is provided with at least one elastic element 3; an annular concave area 21 is arranged on the outer wall of the piston 2, and the piston ring 1 is integrally clamped in the annular concave area 21; one end of the elastic element 3 abuts against the piston 2, and the other end abuts against the piston ring 1; as shown in fig. 10, the elastic element 3 is a spring, one end of which has a larger diameter than the other end thereof, so as to achieve a jamming of the spring in the inner recess 13 of the piston or piston ring 1. In the use, the inner wall of the split body 11 (piston ring 1) is used for attaching to the piston 2, and the outer wall of the split body 11 (piston ring 1) is used for attaching to the inner wall of the cylinder body 12 of the cylinder.
Another embodiment
A piston assembly, the main structure of which refers to the foregoing embodiment, and which differs from the foregoing embodiment in that: adjacent split bodies 11 are mutually inserted, specifically, labyrinth grooves are arranged on two sides of each split body 11 to realize the mutual insertion of the adjacent split bodies 11. In addition, matched buckling parts can be arranged on two sides of each split body 11 to realize mutual buckling of the adjacent split bodies 11.
It should be noted that, in a specific application, the number of the segments 11 and the number of the elastic elements 3 respectively include, but are not limited to, three, and the specific size of each component is determined by calculation of those skilled in the art.
In each embodiment, the shape and the structure of the steel die for pressing the split blank are matched with those of a corresponding piston ring, and the protective atmosphere can adopt argon.

Claims (10)

1. A piston ring, characterized in that: the piston ring is used for replacing a sealing ring, an oil ring and a retainer ring of a standard piston assembly, the piston ring is of an annular structure formed by enclosing a plurality of split bodies (11), and each split body (11) is manufactured by adopting a powder metallurgy process.
2. The piston ring as set forth in claim 1 wherein: the piston ring comprises the following raw materials of 0.2-2% of C, 0.5-2.5% of Cu, 0.5-2% of Mo, 0.5-2.5% of Ni and 0.3-0.8% of Cr by mass percent.
3. The piston ring as set forth in claim 2 wherein: the piston ring is made of 0.2-2% of C, 0.5-2.5% of Cu, 0.5-2% of Mo, 0.5-2.5% of Ni, 0.3-0.8% of Cr and inevitable impurities.
4. The piston ring as set forth in any one of claims 1-3 wherein: the inner wall of the split body (11) is used for being attached to the piston, the outer wall of the split body (11) is used for being attached to the inner wall of the cylinder body of the cylinder, an inner concave portion (13) is arranged on the inner wall of the split body (11), and the inner concave portion (13) is used for containing one end portion of the elastic element (3).
5. The piston ring as set forth in claim 4 wherein: an oil groove (12) is arranged at the end part of the split body (11).
6. The piston ring as set forth in claim 5 wherein: the concave part (13) adopts a gap or a blind hole.
7. The piston ring as set forth in claim 6 wherein: the adjacent segments (11) are mutually inserted, lapped or buckled.
8. The piston ring as set forth in claim 7 wherein: the oil groove (12) is radially arranged, and the oil groove (12) extends from the inner wall of the split body (11) to the outer wall of the split body (11).
9. The piston ring as set forth in claim 8 wherein: the outer wall of the split body (11) is annularly provided with a groove (16), and the grooves (16) of all the split bodies (11) jointly enclose to form a ring groove.
10. The method for producing a piston ring according to any one of claims 1 to 9, wherein: pressing the alloy powder into a powder with a density of 6.8-7.1 g/cm3The method comprises the following steps of (1) pre-forming a split body blank, placing the pre-forming split body blank in a sintering furnace with a protective gas atmosphere for sintering, and cooling and forming, wherein the sintering temperature is controlled to be 1100-1200 ℃.
CN202011320978.8A 2020-11-07 2020-11-23 Piston ring and preparation method thereof Pending CN112459919A (en)

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CN2020112342607 2020-11-07
CN202011234260 2020-11-07

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CN202011310253.0A Pending CN113958709A (en) 2020-11-07 2020-11-20 Piston ring and piston assembly
CN202022703280.6U Active CN213743713U (en) 2020-11-07 2020-11-20 Piston and assembly
CN202022708396.9U Active CN213655696U (en) 2020-11-07 2020-11-20 Piston ring and piston assembly
CN202011320978.8A Pending CN112459919A (en) 2020-11-07 2020-11-23 Piston ring and preparation method thereof
CN202023049324.4U Active CN214304074U (en) 2020-11-07 2020-12-17 Piston ring and piston assembly

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CN202022703280.6U Active CN213743713U (en) 2020-11-07 2020-11-20 Piston and assembly
CN202022708396.9U Active CN213655696U (en) 2020-11-07 2020-11-20 Piston ring and piston assembly

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CN202023049324.4U Active CN214304074U (en) 2020-11-07 2020-12-17 Piston ring and piston assembly

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Publication number Priority date Publication date Assignee Title
US3826508A (en) * 1968-09-06 1974-07-30 Int Harvester Co Ring manufacture, productive of line contact seal
CN2256963Y (en) * 1996-07-09 1997-06-25 张进元 Split-type piston-ring
CN2380702Y (en) * 1999-04-13 2000-05-31 高翔 Single-slot self-sealing piston gas-loop
CN2475878Y (en) * 2000-06-29 2002-02-06 葛亚峰 Sealing ring
CN2557707Y (en) * 2002-05-09 2003-06-25 林孟良 Oil ring for piston ring of internal combustion engine
CN201513553U (en) * 2009-08-21 2010-06-23 南车戚墅堰机车车辆工艺研究所有限公司 Strengthening oil ring
CN201696605U (en) * 2010-07-15 2011-01-05 李怀志 Autocompensation piston ring
CN103447521A (en) * 2013-07-26 2013-12-18 安庆市德奥特汽车零部件制造有限公司 High-air-tightness powder alloy piston ring material and preparation method thereof
CN210289947U (en) * 2019-08-02 2020-04-10 仪征天华活塞环有限公司 Steel piston ring gas ring

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3826508A (en) * 1968-09-06 1974-07-30 Int Harvester Co Ring manufacture, productive of line contact seal
CN2256963Y (en) * 1996-07-09 1997-06-25 张进元 Split-type piston-ring
CN2380702Y (en) * 1999-04-13 2000-05-31 高翔 Single-slot self-sealing piston gas-loop
CN2475878Y (en) * 2000-06-29 2002-02-06 葛亚峰 Sealing ring
CN2557707Y (en) * 2002-05-09 2003-06-25 林孟良 Oil ring for piston ring of internal combustion engine
CN201513553U (en) * 2009-08-21 2010-06-23 南车戚墅堰机车车辆工艺研究所有限公司 Strengthening oil ring
CN201696605U (en) * 2010-07-15 2011-01-05 李怀志 Autocompensation piston ring
CN103447521A (en) * 2013-07-26 2013-12-18 安庆市德奥特汽车零部件制造有限公司 High-air-tightness powder alloy piston ring material and preparation method thereof
CN210289947U (en) * 2019-08-02 2020-04-10 仪征天华活塞环有限公司 Steel piston ring gas ring

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Title
刘文波: "发动机活塞环材料综述", 《热带农业工程》 *
安士杰: "《船舶柴油机结构》", 30 November 2015 *

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CN113958709A (en) 2022-01-21
CN213743713U (en) 2021-07-20
CN213655696U (en) 2021-07-09
CN214304074U (en) 2021-09-28

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Application publication date: 20210309