CN218493692U - Piston ring group for cylinder liner-free diesel engine - Google Patents
Piston ring group for cylinder liner-free diesel engine Download PDFInfo
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- CN218493692U CN218493692U CN202222498552.2U CN202222498552U CN218493692U CN 218493692 U CN218493692 U CN 218493692U CN 202222498552 U CN202222498552 U CN 202222498552U CN 218493692 U CN218493692 U CN 218493692U
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Abstract
The utility model discloses a piston ring group for no cylinder liner diesel engine. The piston ring group comprises a first gas ring, a second gas ring and a third oil ring, wherein a first coating is arranged on the outer circular surface of the first gas ring and is an FDG coating; a second coating layer is arranged on the outer circular surface of the second air ring, and the second coating layer is a nitride layer; the third oil ring is a small-hole oil ring and comprises an oil ring body and an oil scraping belt arranged on the outer side of the oil ring body, wherein a third coating is arranged on the outer circular surface of the oil scraping belt, and the third coating is an FDG coating. The utility model discloses a piston ring group has solved the piston ring group wear resistance of no cylinder liner diesel engine poor, the easy cylinder that draws, the friction loss is big, the high problem of machine oil consumption.
Description
Technical Field
The utility model relates to a piston ring structure, in particular to a piston ring group for no cylinder liner diesel engine.
Background
In the traditional design of the piston ring group, the surface treatment is carried out, a first gas ring and an oil ring usually adopt a chromium-electroplating-based coating, and a second gas ring does not carry out strengthening surface treatment; structurally, the ring body is heavy, the flexibility is not good, the air leakage and the engine oil consumption are not good, and the friction loss is also large. When the cylinder sleeve is adopted, the cylinder sleeve is often strengthened and optimized from multiple aspects such as materials, surface treatment, reticulate patterns and the like so as to be matched with a friction pair of a piston ring, reduce abrasion, reduce friction, and reduce air leakage and oil consumption.
Along with the continuous improvement of the requirements of energy conservation and emission reduction, the lightening of the diesel engine also becomes the development direction of various engine plants, wherein the small and medium-sized diesel engines have a trend of adopting the design without cylinder sleeves, the volume of the engine can be obviously reduced, the weight of the engine can be reduced, and the fuel economy can be improved. In recent years, more and more diesel engines have adopted a sleeveless design.
Meanwhile, the diesel engine further pursues low engine oil consumption, low friction and long service life, the explosion pressure of the engine is further improved, the load is further increased, and the traditional piston ring set can not meet the requirements, which is characterized in that the cylinder hole is abraded quickly, even the cylinder is pulled, and the engine oil consumption is obviously deteriorated. Mainly because of electroplating surface treatment, the oil storage performance is poor, the requirements of high load and high detonation pressure of the existing engine can not be well met, and the cylinder drawing caused by poor lubrication of a ring is avoided; the electroplating surface treatment has larger aggressivity to the cast iron cylinder sleeve, which causes great abrasion of the cylinder sleeve, thereby increasing the engine oil consumption and even causing cylinder scuffing. The wear resistance becomes the greatest problem if molybdenum sprayed or nitrided coatings are used. The key is that no cylinder sleeve is provided, the engine body and the cylinder hole are made of the same material, the wear resistance of the cylinder hole material is greatly lower than that of the cylinder sleeve material (the cylinder sleeve material can realize various metallographic structures by adding various alloys and carrying out heat treatment), and meanwhile, the reticulate processing of the cylinder hole is obviously inferior to that of the cylinder sleeve, and the factors cause the problem of prominent property. Therefore, it is necessary to develop a piston ring assembly suitable for a liner-less diesel engine in terms of surface treatment, structure, and the like of the piston ring.
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 for no cylinder liner diesel engine has solved the piston ring group wear resistance of no cylinder liner diesel engine poor, the easy cylinder that draws, the friction loss is big, the high problem of machine oil consumption.
The technical scheme is as follows: the piston ring group for the cylinder liner-free diesel engine comprises a first gas ring, a second gas ring and a third oil ring, wherein a first coating is arranged on the outer circumferential surface of the first gas ring, and the first coating is an FDG coating; a second coating layer is arranged on the outer circular surface of the second air ring, and the second coating layer is a nitride layer; the third oil ring is a small-hole oil ring and comprises an oil ring body and an oil scraping belt arranged on the outer side of the oil ring body, wherein a third coating is arranged on the outer circular surface of the oil scraping belt, and the third coating is an FDG coating.
As a preferred structure of the utility model, the ring height of the first air ring is 1.83-1.85 mm; the ring height of the second gas ring is 1.98-2.00 mm; the ring height of the third oil ring is 1.98-2.00 mm.
As a preferred structure of the utility model, the side gap of the first air ring is 0.085-0.125 mm, and the back gap of the first air ring is 0.55-0.95 mm; the side gap of the second air ring is 0.06-0.10 mm, and the back gap of the second air ring is 0.75-1.15 mm; the side gap of the third oil ring is 0.03-0.07 mm, and the back gap of the third oil ring is 0.45-0.85 mm.
As a preferred structure of the utility model, the height of the oil scraping belt of third oil ring is 0.25mm, the height of the outer disc in oil scraping belt is 0.15mm.
As an optimized structure of the utility model, the outer disc of the first air ring is provided with the nitriding coating.
As an optimized structure of the utility model, the cross section of the second air ring is a conical surface.
As an optimized structure of the utility model, the outer circular surface of the second gas ring is provided with a nitriding coating.
As an optimized structure of the utility model, the face pressure of first way gas ring is 0.12 ~ 0.14Mpa, the face pressure of second way gas ring is 0.14 ~ 0.16Mpa, the face pressure of third way oil ring is 1.7 ~ 1.9Mpa.
As an optimized structure of the utility model, the outer disc of the oil scraping belt is provided with the nitriding coating.
As an optimized structure of the utility model, the cross section of the first air ring is an asymmetric barrel surface.
Has the advantages that: (1) The oil control device adopts the classic three-ring group design, ensures the air leakage and oil consumption control level of the engine, adopts the thinning design through each ring, improves the flexibility through improving the oil ring structure, ensures the oil control level, and can avoid the problem of large abrasion caused by improving the elasticity; (2) The first oil ring of the utility model adopts the coating FDG with excellent cylinder tensile property, self-lubricating property and wear resistance, in addition, the coating can be used for steel rings and cast iron materials, and the application universality is stronger; (3) The outer circle surface of the second gas ring adopts the nitriding coating, so that the problem of large abrasion of a friction pair caused by the fact that the material of the piston ring is close to the material of the cylinder body is solved; (4) The coating of the oil scraping belt of the oil ring adopts the wear-resistant and antifriction coating FDG, and the oil ring coating can be used for steel rings and cast iron materials, so that the application universality is stronger; (5) The oil ring of the utility model adopts a special structural design, ensures downward oil scraping and better upward oil distribution, so as to improve the lubrication of the first air ring and the second air ring and reduce the abrasion of the friction pair; (6) The utility model discloses a piston ring in the piston ring group adopts the low elastic design to optimize the backlash, the back clearance that match with the piston, the face pressure of each ring of rational distribution.
Drawings
Fig. 1 is a schematic structural view of a first gas ring section of a piston ring assembly according to the present invention;
fig. 2 is a schematic structural view of a second air ring section of the piston ring assembly of the present invention;
fig. 3 is a schematic structural view of a third oil ring section of the piston ring assembly of the present invention;
FIG. 4 shows the results of relative coefficient of friction tests for different coatings of the piston ring assembly of the present invention;
FIG. 5 shows the results of comparative wear resistance tests of different coatings of the piston ring assembly of the present invention;
fig. 6 shows the results of the tensile cylinder capacity tests of the different coatings of the piston ring assembly of the present invention.
Detailed Description
Example (b): a piston ring group for no cylinder liner diesel engine, including first way gaseous ring 1, second way gaseous ring 2 and third way oil ring 3.
As shown in fig. 1, the cross section of the first gas ring 1 is an asymmetric barrel-shaped surface, the outer circumferential surface of the first gas ring 1 is provided with a nitrided coating, and the outer side of the outer circumferential surface of the first gas ring 1 is provided with a first coating 101, and the first coating 101 is an FDG coating, as a preferred implementation structure of this embodiment, the first coating 101 is an FDG300.
As shown in fig. 2, the second air ring 2 is a reverse twisted ring, the cross section of the second air ring 2 is a tapered surface, and the outer circumferential surface of the second air ring 2 is nitrided to form a nitrided layer.
As shown in fig. 3, the third oil ring 3 is a small-pore oil ring, and includes an oil ring body 301 and an oil scraping belt 302 disposed outside the oil ring body 301, a third coating 303 is disposed outside an outer circumferential surface of the oil scraping belt 302, the third coating is an FDG coating, and a nitriding treatment is performed on the outer circumferential surface of the oil scraping belt 302 to form a nitrided coating. The utility model discloses each ring adopts the slim design, adopts low elastic force design to optimize the backlash, the back clearance that match with the piston, the face pressure of each ring of rational distribution.
As an alternative structure of this embodiment, the thickness (min) of the first coating layer 101 is 0.02mm, the thickness (min) of the nitride layer is 0.05mm, and the thickness (min) of the third coating layer 303 is 0.005mm.
As shown in Table 1, in the present embodiment, the ring height of the first gas ring 1 is 1.84. + -. 0.01mm, the ring height of the second gas ring 2 is 1.99. + -. 0.01mm, and the ring height of the third oil ring 3 is 1.99. + -. 0.01mm. The side gap of the first air ring 1 is 0.085-0.125 mm, and the back gap is 0.55-0.95 mm; the side gap of the second air ring 2 is 0.06-0.10 mm, and the back gap of the second air ring is 0.75-1.15 mm; the side gap of the third oil ring 3 is 0.03-0.07 mm, and the back gap of the third oil ring 3 is 0.45-0.85 mm. In this embodiment, the width of the oil scraping belt (height of the oil scraping belt) of the third oil ring 3 is 0.25mm, and the height of the outer circumferential surface of the oil scraping belt 302 is 0.15mm. As an alternative configuration of this embodiment, the outer angle of the oil scraping belt 302 is 25 °, and the inner angle of the oil scraping belt 302 is 8 °.
TABLE 1 Main design parameters for each Ring
| Design parameters | First air ring | Second gas ring | Third oil ring |
| Ring height (mm) | 1.84±0.01 | 1.99±0.01 | 1.99±0.01 |
| Side clearance (mm) | 0.085～0.125 | 0.06～0.10 | 0.03～0.07 |
| Backlash (mm) | 0.55～0.95 | 0.75～1.15 | 0.45～0.85 |
The utility model discloses the face pressure of every way gas ring of further rational distribution, as an preferred embodiment, the face pressure of first way gas ring 1 is 0.12 ~ 0.14Mpa, and the face pressure of second way gas ring 2 is 0.14 ~ 0.16Mpa, and the face pressure of third way oil ring 3 is 1.7 ~ 1.9Mpa. As a specific application mode, the surface pressure of the first gas ring 1 is 0.13MPa, the surface pressure of the second gas ring 2 is 0.15MPa, and the surface pressure of the third oil ring 3 is 1.8MPa.
The utility model is used for the full speed full load bench test of 1000 hours of the piston ring group of the diesel engine without cylinder sleeve, the closed clearance increment of the first air ring 1 is less than or equal to 0.02mm, the closed clearance increment of the second air ring 2 is less than or equal to 0.05mm, and the closed clearance increment of the third oil ring 3 is less than or equal to 0.04mm; after 1000 hours of full-speed full-load bench test, no abrasion is seen in the cylinder hole reticulate pattern; the deterioration rate of the engine oil consumption is less than or equal to 15 percent after 1000 hours of full-speed full-load bench test; adopt the utility model discloses a piston ring group, the friction consumption reduces about 1%.
The application example is as follows: the piston ring group is used for testing the friction coefficient, a friction wear tester is used for comparing the friction coefficient, the wear resistance and the tensile cylinder capacity of a plurality of piston ring surface treatment layers, the surface coatings comprise five of Cr, FTC, FDC, crN and FDG, the results are shown in figures 4-6, and the results in figures 4-6 show that the friction coefficient is low by adopting the FDG coating, the wear loss of the piston ring group can be reduced, and the tensile cylinder capacity of the piston ring group can be improved.
Further, the following comparative experiment was performed. By adopting the piston ring group in the prior art, after a 1000-hour test, the excircle abrasion of each ring is serious, the closed gap of the first gas ring is increased by 0.25mm, the closed gap of the second gas ring is increased by 0.20mm, the closed gap of the third oil ring is increased by 0.50mm, the cylinder hole is seriously abraded, and the oil consumption deterioration rate is 200%. Adopt the utility model discloses piston ring group, under the condition that does not change the piston ring groove, improve piston ring surface treatment, oil ring structure, after the 1000 hours is experimental, each ring excircle wearing and tearing are minimum, the closed clearance increase 0.01mm of first air ring 1, the closed clearance increase 0.05mm of second air ring 2, the 3 closed clearances of third air ring increase 0.03mm, the cylinder hole reticulation is clear, machine oil consumption deterioration rate 10%.
Claims (10)
1. A piston ring group for a cylinder liner-free diesel engine comprises a first gas ring (1), a second gas ring (2) and a third oil ring (3), and is characterized in that a first coating (101) is arranged on the outer circular surface of the first gas ring (1), and the first coating (101) is an FDG coating; a second coating (201) is arranged on the outer circular surface of the second air ring (2), and the second coating (201) is a nitride layer; the third oil ring (3) is a small-hole oil ring and comprises an oil ring body (301) and an oil scraping belt (302) arranged on the outer side of the oil ring body (301), a third coating (303) is arranged on the outer circular surface of the oil scraping belt (302), and the third coating is an FDG coating.
2. The piston ring group for the linerless diesel engine as recited in claim 1, wherein the ring height of the first gas ring (1) is 1.83-1.85 mm; the ring height of the second gas ring (2) is 1.98-2.00 mm; the ring height of the third oil ring (3) is 1.98-2.00 mm.
3. The piston ring group for the linerless diesel engine as recited in claim 2, wherein a side clearance of the first gas ring (1) is 0.085-0.125 mm, and a back clearance of the first gas ring (1) is 0.55-0.95 mm; the side gap of the second air ring (2) is 0.06-0.10 mm, and the back gap of the second air ring (2) is 0.75-1.15 mm; the side gap of the third oil ring (3) is 0.03-0.07 mm, and the back gap of the third oil ring (3) is 0.45-0.85 mm.
4. The piston ring group for a linerless diesel engine of claim 3 wherein the height of the oil scraping belt (302) of the third oil ring (3) is 0.25mm, and the height of the outer circular surface of the oil scraping belt (302) is 0.15mm.
5. The piston ring group for the linerless diesel engine as recited in claim 1, wherein an outer circumferential surface of the first gas ring (1) is provided with a nitrided coating.
6. The piston ring group for a linerless diesel engine as recited in claim 1, wherein the cross section of the second air ring (2) is a tapered surface.
7. The piston ring group for the linerless diesel engine as recited in claim 6, wherein an outer circumferential surface of the second gas ring (2) is provided with a nitrided coating.
8. The piston ring group for the linerless diesel engine as recited in claim 1, wherein a surface pressure of the first gas ring is 0.12 to 0.14Mpa, a surface pressure of the second gas ring is 0.14 to 0.16Mpa, and a surface pressure of the third oil ring is 1.7 to 1.9Mpa.
9. The piston ring group for the linerless diesel engine as recited in claim 1, wherein an outer circumferential surface of the oil scraping belt (302) is provided with a nitrided coating.
10. The piston ring group for the linerless diesel engine as recited in claim 1, wherein the cross section of the first top ring (1) is an asymmetric barrel surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222498552.2U CN218493692U (en) | 2022-09-21 | 2022-09-21 | Piston ring group for cylinder liner-free diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222498552.2U CN218493692U (en) | 2022-09-21 | 2022-09-21 | Piston ring group for cylinder liner-free diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218493692U true CN218493692U (en) | 2023-02-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222498552.2U Active CN218493692U (en) | 2022-09-21 | 2022-09-21 | Piston ring group for cylinder liner-free diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218493692U (en) |
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- 2022-09-21 CN CN202222498552.2U patent/CN218493692U/en active Active
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