CN110118132B - Sealing combined piston ring, piston assembly, internal combustion engine and sealing method - Google Patents
Sealing combined piston ring, piston assembly, internal combustion engine and sealing method Download PDFInfo
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- CN110118132B CN110118132B CN201910480149.7A CN201910480149A CN110118132B CN 110118132 B CN110118132 B CN 110118132B CN 201910480149 A CN201910480149 A CN 201910480149A CN 110118132 B CN110118132 B CN 110118132B
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- 238000007789 sealing Methods 0.000 title claims abstract description 51
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000003860 storage Methods 0.000 claims description 6
- 230000000295 complement effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 20
- 239000003921 oil Substances 0.000 description 18
- 239000010705 motor oil Substances 0.000 description 9
- 238000013461 design Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000005461 lubrication Methods 0.000 description 5
- 230000005465 channeling Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000007790 scraping Methods 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000007142 ring opening reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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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
- F16J9/12—Details
- F16J9/14—Joint-closures
- F16J9/16—Joint-closures obtained by stacking of rings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
A sealing combined piston ring, a piston assembly, an internal combustion engine and a sealing method. The sealing combined piston ring comprises a first piston ring and a second piston ring which are arranged in a matched mode; the longitudinal section of the first piston ring is in a step shape, and the step surface of the first piston ring is positioned on the inner circumference side of the first piston ring; the longitudinal section of the second piston ring is in a ladder shape matched with the longitudinal section of the first piston ring, and the ladder surface of the second piston ring is positioned on the outer circumference side of the second piston ring; the axial contact surface of the first piston ring and the second piston ring is an inclined contact surface; the top of the inner circular surface of the first piston ring is provided with a ring groove for generating positive torsion. Compared with a single piston ring, the invention has three gas sealing surfaces, and the labyrinth effect exists between the sealing surfaces, so that one piston ring can play a role in sealing multiple rings.
Description
Technical Field
The invention relates to the field of design and manufacture of parts of internal combustion engines, in particular to a sealing combined piston ring, a piston assembly, an internal combustion engine and a sealing method.
Background
The piston ring is an important part in the combustion chamber of the internal combustion engine, and an elastic metal ring assembled in the piston ring groove forms a seal between the outer circle of the cylinder wall and the surface of the piston ring groove through the self elasticity and the pressure of gas in the cylinder, and is a core part of the combustion chamber of the internal combustion engine. The existing piston rings mainly comprise a single body type piston ring and a combined type piston ring. It is often necessary to mount 3-4 piston rings on a single piston.
The main functions of the piston ring mainly comprise four functions of sealing, oil control, heat transfer and supporting, and the performance, the working reliability, the engine oil consumption rate and the service life of the engine are directly influenced. The piston ring directly bears the impact of high-temperature high-pressure air flow when the piston works, and according to reliable data, 60% -75% of heat absorbed by the engine piston group is emitted by the ring belt part. In the three piston rings, the proportion of the sealing gas of the first ring is about 85 percent, and meanwhile, 10-20 percent of oil control work is also completed.
The basic principle of the combined piston ring is that the combined ring is driven by the compression force and the explosive force generated in the engine cylinder to be instantly compressed and released with the piston. The closure, decompression and slow release between the main ring and the auxiliary ring in the combined ring are achieved, the instant sealing effect is finally achieved, and the instant explosion stroke is guaranteed to be finished. The higher the rotational speed, the shorter the burst stroke instant, and the smaller the leakage amount.
The existing piston ring design has the following defects:
(1) Most of the existing piston rings are single piston rings, and the upper surface and the lower surface are heated differently, so that the deformation and the sealing failure of the rings are easily caused;
(2) In order to generate peripheral tension, and in addition, a through type incision is arranged on a part of the circumference for expansion when the piston is installed, so that the problems of lap joint leakage and oil channeling are unavoidable;
(3) Most of the existing combined piston ring patents do not carefully consider the sealing problem at the contact surface of the two rings, so that air flow can leak through a gap at the contact surface of the two rings, and the sealing effect is greatly reduced;
(4) When the piston moves to the upper part of the cylinder sleeve, the piston is difficult to lubricate, so that not only is the resistance increased, but also the wear rate of the piston and the cylinder sleeve is increased, and the service life of the piston ring is reduced.
Disclosure of Invention
Accordingly, one of the primary objectives of the present invention is to provide a sealing combination type piston ring, a piston assembly, an internal combustion engine and a sealing method, which at least partially solve at least one of the above problems.
In order to achieve the above object, as one aspect of the present invention, there is provided a seal combination type piston ring including a first piston ring and a second piston ring disposed in cooperation;
the longitudinal section of the first piston ring is in a step shape, and the step surface of the first piston ring is positioned on the inner circumference side of the first piston ring;
the longitudinal section of the second piston ring is in a ladder shape matched with the longitudinal section of the first piston ring, and the ladder surface of the second piston ring is positioned on the outer circumferential side of the second piston ring;
the axial contact surface of the first piston ring and the second piston ring is an inclined contact surface;
the top of the inner circular surface of the first piston ring is provided with a ring groove for generating positive torsion.
As another aspect of the present invention, there is provided a piston assembly including the seal combination type piston ring.
As a further aspect of the present invention, there is provided an internal combustion engine in which the seal combination type piston ring is employed.
As a further aspect of the invention, a method of sealing a piston of an internal combustion engine is provided, in which the piston is sealed against a moving piston using the seal combination piston ring.
Based on the above technical scheme, the sealing combined piston ring, the piston assembly, the internal combustion engine and the sealing method have at least one of the following advantages compared with the prior art:
1. the problem of deformation caused by uneven heating of the upper part and the lower part of the piston ring is solved, and the service life and the sealing effect of the piston ring are improved;
2. compared with the existing combined piston ring design, the piston ring strengthens the connection between the upper ring and the lower ring (the first piston ring and the second piston ring), and greatly improves the tightness: the axial connection of the two rings is enhanced by the contact surface of the frosted conical surface, the positive torsion moment of the upper ring and the elastic force between the two rings, and the air leakage at the joint of the two ring surfaces is reduced; meanwhile, the positioning between the two rings is simple, and the processing is convenient;
3. the sealing performance is enhanced due to the fact that no through lap joint is arranged, combustion gas can be thoroughly blocked, so that the combustion gas cannot enter a crankcase, power is improved, and oil consumption is reduced;
4. the temperature of the crankcase can be indirectly reduced, so that the lubricating viscosity of engine oil is increased, and the lubricating effect is improved;
5. tiny particles in combustion products can be prevented from entering the crankcase, so that the problem of carbon deposition is alleviated, and the service life of engine oil is prolonged;
6. compared with a single piston ring, the invention has three gas sealing surfaces, and the labyrinth effect exists between the sealing surfaces, so that one piston ring can play a role in sealing multiple rings;
7. the upper piston ring adopts an inner chamfer structure, so that the oil consumption of engine oil is reduced, an additional dynamic behavior is provided for the ring in a working stage, the sealing effect is improved, the friction loss is reduced, and the service life of a combustion chamber assembly is prolonged;
8. the upper ring is of an eccentric barrel surface structure, and the lower ring is of a conical surface structure, so that the oil distribution and scraping capacity of the ring are improved, the friction resistance is reduced, the consumption of engine oil is reduced, and the emission is reduced;
9. the structure of the invention has a pressure-reducing oil storage cavity between the upper ring, the lower ring and the cylinder sleeve, which can effectively improve the lubrication of the piston ring at the upper dead center, prevent oil channeling and reduce the consumption of lubricating oil; the air leakage and the engine oil consumption are reduced through the oil seal, and the overall performance of the engine is improved and improved;
10. the number of the piston rings can be reduced, and only 2-3 piston rings are arranged on the piston, so that the friction loss and the production cost in the combustion chamber of the engine are reduced; or on the premise of not increasing the number of piston rings, the sealing performance of the piston ring is greatly improved.
Drawings
FIG. 1 is a schematic cross-sectional view of a seal combination piston ring and combustion chamber assembly in accordance with an embodiment of the present invention;
FIG. 2 is a schematic view showing an assembled cross-sectional structure of an upper piston ring and a lower piston ring according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing an assembled three-dimensional structure of an upper piston ring and a lower piston ring according to an embodiment of the present invention;
FIG. 4 is a schematic view showing the perspective structure of an upper piston ring in an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of an upper piston ring according to an embodiment of the present invention;
FIG. 6 is a schematic view of a perspective structure of a lower piston ring according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of a lower piston ring according to an embodiment of the present invention;
FIG. 8 is a schematic view of the structure of the upper lap joint and the lower positioning block in the embodiment of the invention;
fig. 9 is a schematic structural view of the lower lap joint and the upper positioning block in the embodiment of the invention.
Reference numerals illustrate:
1-upper piston ring; 2-lower piston rings; 3-piston; 4-cylinder sleeve; 5-conical surface matching surface; 6-an oil storage cavity; 7-ring grooves; 8-an upper limiting block; 9-lower limiting block.
Detailed Description
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Because the placement position of the product can be changed at will, the terms such as upper, lower, left, right and the like in the invention only represent relative positional relationship and are not used for limiting absolute positional relationship.
The invention mainly solves the inherent air leakage problem of the lap joint of the piston ring of the internal combustion engine, and the deformation problem caused by uneven heating of the upper and lower annular surfaces; the sealing effect of a plurality of rings can be achieved through two piston rings on the premise that the number of piston rings is not increased, and the sealing performance of the piston rings is greatly improved; meanwhile, the problems of oil channeling and poor lubrication of the upper part of the cylinder sleeve are solved. Compared with the existing combined piston ring design, the sealing performance is greatly improved: the tight fit is realized through the positive torsion effect of the upper ring and the elasticity between the two rings, and a labyrinth effect exists, so that the air leakage at the joint of the two ring surfaces is greatly reduced; meanwhile, the positioning between the two rings is simple, and the processing is convenient.
The application of the piston ring can improve the dynamic performance of the internal combustion engine, reduce the emission index and the consumption rate of lubricating oil, enhance the heat dissipation effect, reduce the wear rate of the piston ring and prolong the service life of the ring. Particularly, the cold start performance and the idle performance of the engine are improved. The number of the piston rings can be reduced, or the sealing performance of the piston ring can be greatly improved on the premise of not increasing the number of the piston rings.
Specifically, the invention discloses a sealing combined piston ring, which comprises a first piston ring and a second piston ring which are arranged in a matched manner;
the longitudinal section of the first piston ring is in a step shape, and the step surface of the first piston ring is positioned on the inner circumference side of the first piston ring;
the longitudinal section of the second piston ring is in a ladder shape matched with the longitudinal section of the first piston ring, and the ladder surface of the second piston ring is positioned on the outer circumferential side of the second piston ring;
the axial contact surface of the first piston ring and the second piston ring is an inclined contact surface;
the top of the inner circular surface of the first piston ring is provided with a ring groove for generating positive torsion.
Wherein the coefficient of thermal expansion of the first piston ring is smaller than the coefficient of thermal expansion of the second piston ring.
The lower annular surface of the inner circumference of the first piston ring is an inward-inclined conical surface, and the upper annular surface of the outer circumference of the first piston ring is a barrel surface;
the outer circumference upper ring surface of the second piston ring is an outward-inclined conical surface, and the outer circumference lower ring surface of the second piston ring is an inward-inclined conical surface;
wherein the conicity of the inner inclined conical surface and the outer inclined conical surface is 15-75 degrees, for example 45 degrees, and the conicity of the inner inclined conical surface and the conicity of the outer inclined conical surface are complementary angles;
wherein the surface of the conical surface is frosted.
The outer circles of the first piston ring and the second piston ring are provided with oil storage cavities in the circumferential direction with the cylinder sleeve during assembly.
Wherein the first piston ring is located above the second piston ring.
The first piston ring is provided with a first lap opening, and the second piston ring is provided with a second limiting block corresponding to the first lap opening;
the second piston ring is provided with a second lap opening, and the first piston ring is provided with a first limiting block corresponding to the second lap opening;
the included angle between the first lap joint and the second lap joint is 180 degrees;
wherein the first piston ring is in a positive twist inverted stepped shape;
wherein the second piston ring is in a shape of a negative torsion inverted ladder.
The radial width and the axial height of the first piston ring step surface and the radial width and the axial height of the lower piston ring step surface are equal;
wherein the barrel surface axis of the first piston ring is below the central axis;
the radial width of the lower end face of the contact surface of the first piston ring is one half of the radial width of the upper end face of the first piston ring;
the radial width of the upper end face of the contact surface of the second piston ring is one half of the radial width of the lower end face of the second piston ring;
the axial height of the lower section of the stepped contact surface of the first piston ring is one half of that of the upper section;
the axial height of the lower section of the stepped contact surface of the second piston ring is one half of that of the upper section.
The invention also discloses a piston assembly, which comprises the sealing combined piston ring.
The invention also discloses an internal combustion engine, wherein the internal combustion engine adopts the sealing combined piston ring.
The invention also discloses a sealing method of the piston of the internal combustion engine, wherein the movable piston is sealed by adopting the sealing combined piston ring in the internal combustion engine.
In one embodiment of the present invention, the present invention adopts the following technical scheme, for example:
the invention relates to a high-tightness combined piston ring design suitable for an internal combustion engine. Specifically, the piston comprises an upper ring (a first piston ring) and a lower ring (a second piston ring). The upper ring is a positive twisting eccentric barrel surface ring, and the section of the upper ring is in an inverted stepped shape; the lower ring is a conical surface ring, and the section of the lower ring is in a positive stepped shape. The piston ring assembly has no through opening in the axial direction. The upper ring and the lower ring can also be made of different materials according to different requirements.
The invention mainly solves the inherent air leakage problem of the lap joint of the piston ring of the internal combustion engine, and the deformation problem caused by uneven heating of the upper and lower annular surfaces; the sealing effect of a plurality of rings can be achieved through two piston rings on the premise that the number of piston rings is not increased, and the sealing performance of the piston rings is greatly improved; meanwhile, the problems of oil channeling and poor lubrication of the upper part of the cylinder sleeve are solved. Compared with the existing combined piston ring design, the sealing performance is greatly improved: the tight fit is realized through the positive torsion effect of the upper ring and the elasticity between the two rings, and a labyrinth effect exists, so that the air leakage at the joint of the two ring surfaces is greatly reduced; meanwhile, the positioning between the two rings is simple, and the processing is convenient.
The application of the piston ring can improve the dynamic performance of the internal combustion engine, reduce the emission index and the consumption rate of lubricating oil, enhance the heat dissipation effect, reduce the wear rate of the piston ring and prolong the service life of the ring. Particularly, the cold start performance and the idle performance of the engine are improved. The number of the piston rings can be reduced, or the sealing performance of the piston ring can be greatly improved on the premise of not increasing the number of the piston rings.
In another embodiment of the present invention, the present invention adopts the following technical scheme, for example:
the combined piston ring suitable for the internal combustion engine comprises an upper ring and a lower ring, wherein the axial fixation of the upper ring and the lower ring is movably connected by means of the cooperation of the elasticity of the two rings and a stop structure; the upper ring is provided with a boss (a first limiting block), the lower ring is also provided with a boss (a second limiting block), and the bosses of the two rings are matched with the lap openings of the opposite side rings to form circumferential fixation.
The upper ring is a positive torsion ring, and a stepped ring groove is formed in the inner upper end surface of the upper ring; the section is in an inverted ladder shape, and the outer circular surface is in an eccentric barrel surface structure.
The section of the lower ring is in a step shape, and the outer circular surface is in a conical surface structure.
The upper ring opening (the first lap joint) and the lower ring opening (the second lap joint) are kept staggered and 180 degrees.
The contact surfaces of the upper ring and the lower ring are conical surfaces of 15-75 degrees, preferably 45 degrees, which are mutually matched, and the surface of the contact surfaces is frosted.
The invention aims to provide a novel piston ring with high tightness and long service life and excellent oil scraping and distributing capability, which can realize high sealing of a combustion chamber in a cylinder, so as to solve the problems of power reduction of an engine, high engine oil consumption and difficult lubrication of the upper part of a cylinder sleeve, improve the service life of the piston ring, reduce the pollution of engine oil by gas in the cylinder and the wear rate of internal parts, prolong the service lives of the engine oil and the parts and improve the overall reliability and the service life of the internal combustion engine. In order to achieve the above technical effects, in one embodiment of the present invention, for example, the following technical scheme is adopted:
a double-piece combined piston ring is designed into a two-piece structure with upper and lower rings (a first piston ring and a second piston ring) matched.
The combined structure of the upper ring and the lower ring: the contact surfaces of the two rings are mutually matched inclined contact surfaces, the main body section of the upper ring is in an inverted stepped shape, the outer circular surface is an eccentric barrel surface, the upper section ring of the inner circular surface is propped open with a groove (annular groove), and the lower section is an inward inclined conical surface with the angle of 15-75 degrees, preferably 45 degrees; the main body section of the lower ring is of a right-placed ladder shape, the ladder-shaped upper section of the outer circle surface is an outward-inclined conical surface which is mutually in a complementary angle with the lower section of the inner circle surface of the upper ring, and the ladder-shaped lower section is a barrel surface. The two rings of excircles and the cylinder sleeve form a cavity (oil storage cavity) in the circumferential direction, so that the oil scraping effect from the upper part of the cylinder sleeve in the descending process of the piston can be stored, and the oil distribution in the ascending process of the piston is facilitated, so that the effects of lubrication and sealing are achieved. The two rings are matched with the ring overlap opening (the second overlap opening or the first snap) on the opposite side by adopting a positioning boss (the first positioning block or the second positioning block) on the ring.
The upper ring and the lower ring are tightly attached to each other through the elasticity of the rings and the conical matching surface, no through opening exists, and meanwhile, a labyrinth effect is formed through multi-layer sealing of the stepped contact surface, so that the sealing effect is enhanced;
the contact surfaces of the upper ring and the lower ring are subjected to surface frosting treatment so as to ensure the tight axial connection of the two rings in the working process;
the outer circular surface of the upper ring is of an eccentric barrel surface structure, and the axis of the barrel surface is below the central axis;
the radial widths of the stepped upper and lower contact surfaces of the piston ring are equal;
wherein, the axial heights of the stepped contact surfaces of the upper piston ring and the lower piston ring are equal;
the annular lap joint of the upper piston ring and the annular lap joint of the lower piston ring are staggered by 180 degrees;
the upper ring material is subjected to surface treatment, and the upper ring and the lower ring can be made of different materials according to different requirements.
The invention will be described in further detail with reference to specific examples.
As shown in fig. 1 to 9, the present invention can be implemented in such a manner that a sealing combination type piston ring assembly includes a piston 3, an upper piston ring 1 and a lower piston ring 2 mounted on the piston 3, and a cylinder liner 4 is provided outside the piston 3; the section of the upper piston ring 1 is in an inverted ladder shape, and the ladder surface is positioned on the inner circumference side of the upper piston ring 1; the section of the lower piston ring 2 is in a positive stepped shape, and the stepped surface is positioned on the outer circumferential side of the lower piston ring 2. The step surface of the upper piston ring 1 is matched with the step surface of the lower piston ring 2, and the assembled and combined piston ring assembly is complete.
Wherein, the surface of the upper piston ring 1 needs to be treated, if the upper piston ring 1 and the lower piston ring 2 are made of different materials, the thermal expansion coefficient alpha 1 of the upper piston ring 1 material should be smaller than the thermal expansion coefficient alpha 2 of the lower piston ring material.
Wherein, the inverted step contact surface of the upper piston ring 1 circumferentially comprises an upper end surface and a lower end surface, and the step contact surface of the lower piston ring 2 comprises an upper end surface and a lower end surface.
The distance between the upper end face of the stepped contact surface of the upper piston ring 1 and the lower end face of the stepped contact surface of the upper piston ring 1 is equal to the distance between the upper end face of the stepped contact surface of the upper piston ring 1 and the top of the upper piston ring 1; the radial width of the lower end face of the contact surface of the upper piston ring 1 is one half of the radial width of the upper end face of the upper piston ring 1. The distance between the upper end surface of the stepped contact surface of the lower piston ring 2 and the lower end surface of the stepped contact surface of the upper piston ring 1 is equal to the distance between the lower end surface of the stepped contact surface of the lower piston ring 2 and the bottom of the lower piston ring 2 in a mirror image manner; the radial width of the upper end face of the contact surface of the lower piston ring 2 is one half of the radial width of the lower end face of the lower piston ring 2.
The upper piston ring 1 is assembled on the stepped surface of the lower piston ring 2, and the upper end surface of the stepped contact surface of the lower piston ring 2 is overlapped with the upper end surface of the step of the upper piston ring 1.
Wherein the conical surface matching surface 5 is a conical surface with an angle of 15-75 degrees, preferably 45 degrees, and the surface of the conical surface is frosted; the upper piston ring and the lower piston ring are tightly connected in the axial direction through the grinding conical surface matching surface 5 and the elasticity of the two rings.
The step-shaped contact surface of the upper piston ring 1 is provided with an upper limiting block 8 on the opposite side of the upper lap opening along the radial direction, and the lower piston ring 2 is also provided with a lower limiting block 9 matched with the lap opening of the upper piston ring 1 on the step on the opposite side of the lower lap opening of the step-shaped outer circle surface. The limiting blocks are respectively assembled in the lap openings of the opposite side rings and are used for limiting the relative rotation between the upper piston ring 1 and the lower piston ring 2 so as to keep the upper lap opening of the upper piston ring 1 and the lower lap opening of the lower piston ring 2 to be assembled in the piston 3 in a staggered 180-degree state.
The top of the inner circular surface of the upper piston ring 1 is provided with a ring groove 7, so that the whole ring has positive twisting effect, and only the lower edge of the outer circular surface is contacted with the cylinder wall in the working period without air pressure load, and at the moment, the lower edge of the inner circular surface is respectively contacted with the upper stepped surface and the lower stepped surface of the lower piston ring.
Wherein, the stepped lower outer circular surface of the lower piston ring 2 is a conical surface, and a depressurization oil storage cavity 6 is formed between the lower piston ring and the cylinder sleeve.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the invention thereto, but to limit the invention thereto, and any modifications, equivalents, improvements and equivalents thereof may be made without departing from the spirit and principles of the invention.
Claims (19)
1. A sealing combined piston ring comprises a first piston ring and a second piston ring which are arranged in a matched mode;
the longitudinal section of the first piston ring is in a step shape, and the step surface of the first piston ring is positioned on the inner circumference side of the first piston ring;
the longitudinal section of the second piston ring is in a ladder shape matched with the longitudinal section of the first piston ring, and the ladder surface of the second piston ring is positioned on the outer circumference side of the second piston ring;
the axial contact surface of the first piston ring and the second piston ring is an inclined contact surface;
the top of the inner circular surface of the first piston ring is provided with a circular groove for generating positive torsion, so that the first piston ring generates positive torsion moment, the lower circular surface of the inner circumference of the first piston ring is an inner inclined conical surface, the upper circular surface of the outer circumference of the second piston ring is an outer inclined conical surface, the lower circular surface of the outer circumference of the second piston ring is an inner inclined conical surface, and the conical surface is subjected to frosting treatment so as to be matched with the positive torsion moment of the first piston ring and the elastic force between the first piston ring and the second piston ring, so that the axial connection of the first piston ring and the second piston ring is enhanced, and the air leakage of the joint of the first piston ring and the second piston ring is reduced;
the first piston ring is provided with a first lap opening, and the second piston ring is provided with a second limiting block corresponding to the first lap opening; the second piston ring is provided with a second lap opening, the first piston ring is provided with a first limiting block corresponding to the second lap opening, and the limiting blocks of the two rings are matched with the lap opening of the opposite side ring to form circumferential fixation.
2. The seal combination piston ring of claim 1, wherein:
the first piston ring has a lower coefficient of thermal expansion than the second piston ring.
3. The seal combination piston ring of claim 1, wherein:
the upper annular surface of the outer circumference of the first piston ring is a barrel surface.
4. A seal combination piston ring as defined in claim 3, wherein: the conicity of the inner inclined conical surface and the outer inclined conical surface is 15-75 degrees, and the conicity of the inner inclined conical surface and the conicity of the outer inclined conical surface are complementary angles.
5. A seal combination piston ring as defined in claim 3, wherein: the conicity of the inner inclined conical surface and the outer inclined conical surface is 45 degrees.
6. The seal combination piston ring of claim 1, wherein:
and the outer circles of the first piston ring and the second piston ring are provided with oil storage cavities along the circumferential direction with the cylinder sleeve during assembly.
7. The seal combination piston ring of claim 1, wherein:
the first piston ring is located above the second piston ring.
8. The seal combination piston ring of claim 1, wherein: the included angle between the first lap joint and the second lap joint is 180 degrees.
9. The seal combination piston ring of claim 1, wherein: the first piston ring is in a positive twist inverted stepped shape.
10. The seal combination piston ring of claim 1, wherein: the second piston ring is in a negative torsion inverted stepped shape.
11. The seal combination piston ring of claim 1, wherein:
the radial width and the axial height of the first piston ring step surface and the radial width and the axial height of the lower piston ring step surface are equal.
12. The seal combination piston ring of claim 11 wherein: the barrel surface axis of the first piston ring is below the central axis.
13. The seal combination piston ring of claim 11 wherein: the radial width of the lower end face of the contact surface of the first piston ring is one half of the radial width of the upper end face of the first piston ring.
14. The seal combination piston ring of claim 11 wherein: the radial width of the upper end face of the contact surface of the second piston ring is one half of the radial width of the lower end face of the second piston ring.
15. The seal combination piston ring of claim 11 wherein: the axial height of the lower section of the stepped contact surface of the first piston ring is one half of that of the upper section.
16. The seal combination piston ring of claim 11 wherein: the axial height of the lower section of the stepped contact surface of the second piston ring is one half of that of the upper section.
17. A piston assembly comprising a seal combination piston ring according to any one of claims 1 to 16.
18. An internal combustion engine, wherein a sealing combination piston ring according to any one of claims 1 to 16 is employed in the internal combustion engine.
19. A method of sealing a piston of an internal combustion engine, wherein a piston ring according to any one of claims 1 to 16 is combined with a seal in the engine to seal the piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910480149.7A CN110118132B (en) | 2019-06-03 | 2019-06-03 | Sealing combined piston ring, piston assembly, internal combustion engine and sealing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910480149.7A CN110118132B (en) | 2019-06-03 | 2019-06-03 | Sealing combined piston ring, piston assembly, internal combustion engine and sealing method |
Publications (2)
| Publication Number | Publication Date |
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| CN110118132A CN110118132A (en) | 2019-08-13 |
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