CN217501818U

CN217501818U - Piston ring group suitable for hydrogen internal combustion engine

Info

Publication number: CN217501818U
Application number: CN202221502976.5U
Authority: CN
Inventors: 张长春
Original assignee: Nanjing Feiyan Piston Ring Co ltd
Current assignee: Nanjing Feiyan Piston Ring Co ltd
Priority date: 2022-06-16
Filing date: 2022-06-16
Publication date: 2022-09-27
Anticipated expiration: 2032-06-16

Abstract

The utility model discloses a piston ring group suitable for hydrogen internal-combustion engine, including first way gas ring, second way gas ring and steel band combination oil ring, steel band combination oil ring includes the grommet and sets up the doctor-bar in both sides about the grommet, its characterized in that, the outer disc of first way gas ring is provided with the DLC coating, the surface of second way gas ring is provided with first bonderizing layer, the outer disc of doctor-bar is provided with the PVD layer; and an oxide layer is arranged on the surface of the lining ring. The piston ring group meets the reliability requirement of a hydrogen internal combustion engine, and simultaneously reduces the risk of cylinder scuffing and wear resistance of a piston ring.

Description

Piston ring group suitable for hydrogen internal combustion engine

Technical Field

The utility model relates to a piston ring of internal-combustion engine, in particular to piston ring group suitable for hydrogen internal-combustion engine.

Background

With the strictness of automobile emission regulations, the sixth-stage emission standard is implemented in China at present, the emission of harmful pollutants of vehicles is greatly reduced, and on the other hand, the strategies of 'carbon peak reaching' and 'carbon neutralization' are implemented gradually, which puts higher requirements on the carbon emission of the vehicles, and new energy vehicles such as electric vehicles are produced, but the internal combustion engine vehicles still show vigorous vitality due to the obvious advantages of the internal combustion engine vehicles in the aspects of efficiency, reliability, durability, carrying capacity, cost and the like.

The hydrogen is a renewable clean energy source, and has feasibility when being used as the fuel of the internal combustion engine, the basic principle of the hydrogen internal combustion engine is the same as that of the conventional fuel engine, the conversion of chemical energy to mechanical energy is completed according to four strokes of air inlet, compression, work application and air exhaust, the hydrogen internal combustion engine has the greatest advantages of renewable fuel resources and no carbon emission, and accords with the development trend of global 'carbon neutralization'. Due to the characteristics of low ignition energy, high combustion speed, high combustion temperature and the like of hydrogen, the hydrogen internal combustion engine is easy to have abnormal combustion problems such as deflagration, pre-ignition, backfire and the like, and due to the strong hydrogen permeability, the problems of hydrogen embrittlement of parts, insufficient lubricating capacity of engine oil and the like sometimes occur, and piston rings often show the problems of cylinder scuffing, non-wear resistance, high air blowby amount, high engine oil consumption and the like.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to solve the problem of the prior art, the utility model provides a piston ring group suitable for hydrogen internal-combustion engine, this piston ring group has satisfied hydrogen internal-combustion engine's reliability requirement, reduces the piston ring simultaneously and draws jar, the not wear-resisting risk.

The technical scheme is as follows: the piston ring group suitable for the hydrogen internal combustion engine comprises a first gas ring, a second gas ring and a steel strip combined oil ring, wherein the steel strip combined oil ring comprises a lining ring and scraping pieces arranged on the upper side and the lower side of the lining ring; and an oxide layer is arranged on the surface of the liner ring.

As an optimized structure of the utility model, the material of the first gas ring is chrome silicon alloy steel.

As a preferred structure of the utility model, the upper and lower terminal surface and the interior disc of first way gas ring are provided with the second bonderizing layer.

As a preferable structure of the utility model, the hardness of the DLC coating is 1800-3500 HV 0.025; the thickness of the DLC coating is 0.01-0.03 mm; and/or the hardness of the PVD layer is 1200-1800 HV0.05, and the thickness of the PVD layer is 0.015-0.05 mm.

As a preferred structure of the utility model, the cross-section of the second air ring is a nose-shaped conical surface.

As a preferred structure of the utility model, the material of the second gas ring is carbide cast iron; and/or the material fineness grade of the second gas ring (2) is MC 32.

As a preferred structure of the present invention, the material of the lining ring is austenitic stainless steel; the material of the scraping blade is non-alloy steel.

As a preferred structure of the utility model, the upper and lower end faces of the first air ring are parallel, and the outer circular surface of the first air ring is an asymmetric barrel surface; and/or the inner circle surface of the first gas ring is provided with an inner chamfer.

The piston ring group suitable for the hydrogen internal combustion engine comprises a first gas ring, a second gas ring and a steel strip combined oil ring, wherein the steel strip combined oil ring comprises a lining ring and scraping pieces arranged on the upper side and the lower side of the lining ring, and the first gas ring is made of chromium-silicon alloy steel; the second gas ring is made of carbide cast iron; the material of the lining ring is austenitic stainless steel; the material of the scraping blade is non-alloy steel.

As a preferred structure of the utility model, the upper and lower end faces of the first air ring are parallel, and the outer circular surface of the first air ring is an asymmetric barrel surface; the section of the second air ring is a nose-shaped conical surface; the section of the backing ring is ES2 type, the section of the scraping blade is approximately rectangular, and the outer circular surface of the scraping blade is arc-shaped.

Has the advantages that: (1) the outer circular surface of the utility model adopts the DLC coating, and the DLC coating has the characteristics of low friction and high wear resistance, thereby effectively preventing the phenomena of dry friction and cylinder drawing caused by insufficient lubrication when the first air ring is at the top dead center; (2) the piston ring group of the utility model is used for a hydrogen internal combustion engine, and because hydrogen combustion does not generate carbon deposition, the parallel structure of the upper end surface and the lower end surface of the first gas ring can not lead the piston ring to be blocked by the carbon deposition in the ring groove, and simultaneously, the parallel end surface of the first gas ring and the ring groove can generate the best end surface laminating sealing capability, thereby effectively reducing the air blowby amount; (3) the asymmetric barrel surface structure of the outer circular surface of the first air ring has the best friction and wear performance, on one hand, the abrasion is further reduced, on the other hand, the asymmetric barrel surface structure has the working characteristics of downward oil scraping and upward oil distribution, so that the lubricating performance and the auxiliary oil scraping capacity of the ring are further improved; (4) the first gas ring of the utility model adopts alloy steel material, has higher base body hardness, not only meets the requirement of end surface wear resistance, but also avoids the nitrogen brittleness problem of the existing stainless steel nitriding configuration, thereby the first gas ring of the utility model is tough and reliable, and simultaneously, reduces the risk of strength reduction caused by hydrogen molecule permeation when the ring is in hydrogen-rich environment; (5) the second air ring of the utility model adopts MC32 high hardness material, which can satisfy the wear-resistant requirement, the outer circular surface is a conical surface and has a bevel nose-shaped step, the scraped machine oil can be stored in the second air ring, and the scraped machine oil can quickly return to the nose-shaped cutting platform space through the nose-shaped angle, thereby greatly reducing the machine oil dynamic pressure on the wall surface of the cylinder, preventing the machine oil from being extruded and fleeing, effectively improving the oil scraping capability and reducing the machine oil consumption; on the other hand, the nose ring also has the positive distortion effect, and the end face sealing capability is enhanced, so that the nose ring not only assists in scraping oil, but also assists in sealing fuel gas; (6) the scraping blade of the steel strip combined oil ring adopts the PVD coating, and the PVD coating has ceramic characteristic and excellent friction and wear performance; in addition, the steel strip combined oil ring has large oil return space, strong capability of following the deformation of a cylinder and excellent oil scraping capability.

Drawings

FIG. 1 is a front view of a first gas ring of the present invention;

FIG. 2 is a cross-sectional view A-A of the first gas ring shown in FIG. 1;

FIG. 3 is a schematic structural view of another embodiment of the first gas ring of the present invention;

FIG. 4 is a front view of a second air ring of the present invention;

FIG. 5 is a cross-sectional view taken along line A-A of the second gaseous ring of FIG. 4;

FIG. 6 is a front view of the steel band assembled oil ring of the present invention;

FIG. 7 is a sectional view taken along the line A-A of the steel strip assembled oil ring shown in FIG. 6;

fig. 8 is a diagram illustrating the working state of the piston ring assembly in the piston ring groove according to the present invention.

Detailed Description

Example (b): piston ring group suitable for hydrogen internal-combustion engine, including first way gaseous ring 1, second way gaseous ring 2 and steel band combination oil ring 3, steel band combination oil ring 3 includes backing ring 31 and sets up the doctor-bar 32 in both sides about the backing ring, and backing ring 31 is used for increasing doctor-bar 32's tension.

As shown in fig. 1 to 3, the first gas ring 1 is made of the following materials: according to the chromium-silicon alloy steel of ISO6621-3/GB1149.3 'internal combustion engine piston ring material specification', the material is of fine grade MC64, the first gas ring 1 is made of alloy steel material, has higher matrix hardness, not only meets the requirement of end surface wear resistance, but also avoids the problem of nitrogen brittleness of the existing stainless steel nitriding configuration, so that the ring is tough and reliable, and simultaneously, the risk of strength reduction caused by hydrogen molecule permeation when the ring is in a hydrogen-rich environment is reduced. The outer circle surface of the first gas ring 1 is provided with a DLC coating 11 (diamond-like carbon coating), the hardness of the DLC coating is 1800-3500 HV0.025, the thickness of the DLC coating is 0.01-0.03 mm, and the rest surface of the first gas ring 1 is subjected to phosphating treatment to form a second phosphating layer 12. As shown in fig. 2, as an alternative structure of the present embodiment, the cross-sectional shape of the first gas ring 1 is: the upper end surface and the lower end surface are parallel, the outer circular surface is a convex barrel surface, and as a preferred scheme, the barrel surface is an asymmetric barrel surface, namely, the high point of the barrel surface deviates to the lower part of the high center line of the ring. As an alternative structure of the present embodiment, as shown in fig. 3, the first gas ring 1 in the present embodiment is added with a twisted inner chamfer 13 on the inner circle side. Because the main effect of first gas ring 1 is sealed high-pressure gas, in this embodiment, adopted the DLC coating at first gas ring 1's excircle face, this coating has low coefficient of friction, high wear resistance's characteristics, can effectively prevent first gas ring 1 and take place the phenomenon of dry friction, scuffing of a cylinder when top dead center because of the lubrication is not enough, according to the requirement of whole machine to B10 life-span, its coating thickness can be designed as required between 0.01 ~ 0.03 mm. Because hydrogen combustion does not produce carbon deposition, the structure that the upper and lower terminal surface of first gas ring is parallel does not lead to the piston ring to be died by the carbon deposition card in the annular, and meanwhile, parallel terminal surface and annular can produce the best terminal surface and laminate sealing ability, have effectively reduced the gas blowby volume. In this embodiment, the outer circular surface of the first air ring 1 is an asymmetric barrel surface structure, and has an optimal frictional wear performance, so that on one hand, wear is further reduced, and on the other hand, the first air ring has the working characteristics of downward oil scraping and upward oil distribution, and therefore, the lubricating performance and the auxiliary oil scraping capacity of the first air ring are further improved.

As shown in fig. 4 and 5, the second gas ring 2 is made of the following materials: according to the carbide cast iron described in ISO6621-3/GB1149.3 'internal combustion engine piston ring material specification', the material is fine grade MC32, and the MC32 high-hardness material can meet the requirement of wear resistance. And performing phosphating treatment on all surfaces of the second gas ring 2 to form a first phosphating layer 21 on the surface of the second gas ring 2. In this embodiment, the cross-sectional shape of second way gas ring is the nose conical surface, has the nose step of oblique cutting formula, can store the machine oil of scraping off, and the machine oil of scraping off can return to the nose through about 15 nose shape angles 22 fast and cut the platform space in, therefore has reduced the machine oil dynamic pressure of cylinder wall face by a wide margin, prevents that machine oil from being extruded and scurried, has effectively promoted the oil scraping ability, has reduced the machine oil and has consumed. On the other hand, the nose-shaped conical surface also has the positive twisting effect, and the end face sealing capability is enhanced, so that the nose-shaped conical surface not only assists in scraping oil, but also assists in sealing gas.

As shown in fig. 6B, the steel strip built-up oil ring 3 in the present embodiment is composed of two wiper blades 32 and a backing ring 31 for increasing the tension of the wiper blades 32. The liner ring 31 is made of the following materials: austenitic stainless steel according to ISO6621-3/GB1149.3 specification for piston ring materials for internal combustion engines, material fine grade MC 67. The outer surface of the liner ring 31 is oxidized to form an oxide layer 311. The cross-sectional shape of the liner ring 31 is: the supporting blade has a fillet angle theta of about 20 DEG at the circular wave according to model ES2 described in ISO6627/GB/T1149.16 "oil ring combined with piston ring and steel belt".

As shown in fig. 7, the blade 32 in the present embodiment is made of the following materials: the non-alloy steel is specified in ISO6621-3/GB1149.3 specification for piston ring material for internal combustion engine, material fine grade MC 68. The outer circumferential surface of the wiper blade 32 is provided with a PVD layer (CrN layer). The hardness of the PVD layer is 1200-1800 HV0.05, the thickness of the PVD layer is 0.015-0.050 mm, and the rest surfaces of the scraping blade 32 are subjected to phosphating treatment. In the present embodiment, the wiper blade 32 has a substantially rectangular cross-sectional shape, and the outer circumferential surface of the wiper blade 32 has an arc shape. In the embodiment, the PVD layer is adopted in the scraping blade of the steel strip combined oil ring, the PVD layer has a ceramic characteristic and is excellent in frictional wear performance, and the thickness of the coating can be designed as required between 0.015 mm and 0.050mm according to the requirement of the whole machine on the service life mileage of B10. In addition, the steel strip combined oil ring has large oil return space and strong capability of following the deformation of a cylinder, so the oil ring has excellent oil scraping capability, and meanwhile, the fillet angle of theta of the circular wave position of the lining ring is approximately equal to 20 degrees, so that the scraping blade is attached to the ring groove at the moment when in work, the oil sealing capability is enhanced, the oil is prevented from being pumped upwards due to the negative pressure effect of a combustion chamber at the tail end of the exhaust stroke and the intake stroke of the internal combustion engine, and the oil consumption is reduced.

Fig. 8 shows, piston ring group operating state in the annular of piston 5 picture, piston ring group supports cylinder wall 4, this piston ring group is suitable for the bore: 60-160 mm. Each ring in the embodiment has lower processing cost and higher processing efficiency, is easy to realize batch production, and meets the batch requirement of the hydrogen engine on piston rings.

Claims

1. A piston ring group suitable for a hydrogen internal combustion engine comprises a first gas ring (1), a second gas ring (2) and a steel strip combined oil ring (3), wherein the steel strip combined oil ring (3) comprises a backing ring (31) and scraping pieces (32) arranged on the upper side and the lower side of the backing ring, and is characterized in that a DLC coating (11) is arranged on the outer circular surface of the first gas ring (1), a first phosphating layer (21) is arranged on the surface of the second gas ring (2), and a PVD layer (321) is arranged on the outer circular surface of the scraping pieces (32); an oxide layer (311) is arranged on the surface of the lining ring (31).

2. Piston ring group suitable for hydrogen internal combustion engines, according to claim 1, characterized in that the material of the first gas ring (1) is chrome silicon alloy steel.

3. The piston ring set for a hydrogen internal combustion engine according to claim 2, wherein the upper and lower end faces and the inner circumferential face of the first gas ring (1) are provided with the second phosphate coating (12).

4. The piston ring assembly suitable for a hydrogen internal combustion engine according to claim 1, wherein the hardness of the DLC coating is 1800 to 3500HV 0.025; the thickness of the DLC coating is 0.01-0.03 mm; and/or the hardness of the PVD layer (321) is 1200-1800 HV0.05, and the thickness of the PVD layer (321) is 0.015-0.05 mm.

5. A piston ring set adapted for use in a hydrogen internal combustion engine according to claim 1, wherein the second gallery ring (2) is nose-tapered in cross-section.

6. Piston ring group adapted for a hydrogen internal combustion engine according to claim 1, characterized in that the material of the second gas ring (2) is carbide cast iron; and/or the material fineness grade of the second gas ring (2) is MC 32.

7. The piston ring set suitable for a hydrogen internal combustion engine according to claim 1, wherein the material of the liner ring (31) is austenitic stainless steel; the material of the scraper blade (32) is non-alloy steel.

8. The piston ring set applicable to the hydrogen internal combustion engine according to claim 1, wherein the upper end surface and the lower end surface of the first gas ring (1) are parallel, and the outer circular surface of the first gas ring (1) is an asymmetric barrel surface; and/or the inner circular surface of the first gas ring (1) is provided with an inner chamfer (13).

9. A piston ring group suitable for a hydrogen internal combustion engine comprises a first gas ring (1), a second gas ring (2) and a steel strip combined oil ring (3), wherein the steel strip combined oil ring comprises a lining ring (31) and scraping pieces (32) arranged on the upper side and the lower side of the lining ring, and the first gas ring (1) is made of chromium-silicon alloy steel; the material of the second gas ring (2) is carbide cast iron; the lining ring (31) is made of austenitic stainless steel; the material of the scraper blade (32) is non-alloy steel.

10. The piston ring set suitable for the hydrogen internal combustion engine according to claim 9, wherein the upper and lower end surfaces of the first gas ring (1) are parallel, and the outer circular surface of the first gas ring (1) is an asymmetric barrel surface; the section of the second air ring (2) is a nose-shaped conical surface; the section of the backing ring (31) is ES2 type, the section of the wiper blade (32) is approximately rectangular, and the outer circular surface of the wiper blade (32) is arc-shaped.