CN110145598B - Combined piston top land ring, piston assembly, internal combustion engine and sealing method - Google Patents
Combined piston top land ring, piston assembly, internal combustion engine and sealing method Download PDFInfo
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- CN110145598B CN110145598B CN201910475849.7A CN201910475849A CN110145598B CN 110145598 B CN110145598 B CN 110145598B CN 201910475849 A CN201910475849 A CN 201910475849A CN 110145598 B CN110145598 B CN 110145598B
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- top land
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- 238000007789 sealing Methods 0.000 title claims abstract description 33
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000003860 storage Methods 0.000 claims description 6
- 230000000295 complement effect Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 15
- 239000010705 motor oil Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000005465 channeling Effects 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
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004381 surface treatment 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
- 230000009286 beneficial 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
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000017525 heat dissipation Effects 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
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- F16J9/20—Rings with special cross-section; Oil-scraping rings
-
- 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
- F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
A combined piston top land ring, a piston assembly, an internal combustion engine and a sealing method. The combined piston top land ring comprises a first piston ring and a second piston ring which are matched; 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 outer circumference of the upper end surface of the first piston ring is provided with a piston top bank which plays a role in reducing emission. The piston top land can reduce the height of the piston, so that the clearance volume of the combustion chamber is reduced; the piston top is in working stroke, the gas pressure can act on the upper side and the inner side rapidly, the lower side of the ring is tightly attached to the lower side of the groove, the outer circular surface is tightly attached to the cylinder wall, and sealing is facilitated and the exhaust HC emission is reduced.
Description
Technical Field
The invention relates to the field of design and manufacture of parts of internal combustion engines, in particular to a combined piston top land 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 elastic force 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 moment, and the smaller the leakage amount.
The existing piston ring design has the following defects:
(1) Most of the existing piston rings inevitably have the problem of air leakage in the operation of single piston rings. In addition, because the through type notch is provided at a part of the circumference for generating the peripheral tension and expanding when the piston is mounted, the problems of the gas leakage of the lap joint and the oil channeling are unavoidable;
(2) The upper surface and the lower surface of the existing single piston ring are heated differently, which easily causes ring deformation and sealing failure;
(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 modular piston top land ring, a piston assembly, an internal combustion engine and a sealing method, which at least partially solve at least one of the above-mentioned problems.
In order to achieve the above object, as one aspect of the present invention, there is provided a combination piston top land ring including a first piston ring and a second piston ring cooperatively disposed;
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 outer circumference of the upper end surface of the first piston ring is provided with a piston top bank which plays a role in reducing emission.
As another aspect of the present invention, a piston assembly is provided that includes the modular piston top land ring.
As yet another aspect of the present invention, an internal combustion engine is provided that includes the modular piston top land ring.
As a further aspect of the invention, a method of sealing a piston of an internal combustion engine is provided, employing the modular piston top land ring to seal a movable piston.
Based on the above technical solutions, the combined piston top land ring, the piston assembly, the internal combustion engine and the sealing method of the present invention have at least one of the following advantages over the prior art:
1. the L-shaped upper ring (namely the top land of the piston) can reduce the height of the piston, so that the clearance volume of the combustion chamber is reduced;
2. the L-shaped upper ring is in a working stroke, and gas pressure can rapidly act on the upper side surface and the inner side surface, so that the lower side surface of the ring is tightly adhered to the lower side surface of the groove, and the outer circular surface of the ring is tightly adhered to the cylinder wall, thereby being beneficial to sealing and reducing the HC emission of tail gas;
3. 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;
4. compared with the existing combined piston ring design, the piston ring strengthens the connection between the upper ring and the lower ring, and greatly improves the tightness: the axial connection of the two rings is enhanced by the contact surface of the frosted conical surface and the positive torsion moment of the upper ring (namely the first piston ring) and the elastic force between the two rings, so that 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;
5. 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;
6. 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;
7. 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;
8. 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;
9. 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;
10. the upper ring is of an eccentric barrel structure, the lower ring (namely the second piston 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;
11. 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 enhanced;
12. 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 combination piston top land ring and combustion chamber assembly in accordance with an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of an assembled body of upper and lower rings of a modular piston top land ring according to an embodiment of the present invention;
FIG. 3 is a schematic view of an assembled perspective view of upper and lower rings of a modular piston top ring in accordance with an embodiment of the present invention;
FIG. 4 is a schematic perspective view of an upper ring of a modular piston top land ring according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of an upper ring of a modular piston top land ring according to an embodiment of the present invention;
FIG. 6 is a schematic perspective view of a lower ring of a modular piston top land ring according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of a lower ring of a modular piston top land ring according to an embodiment of the present invention;
FIG. 8 is a schematic view of the structure of the upper and lower ring lugs of the modular piston top ring in accordance with an embodiment of the present invention;
fig. 9 is a schematic structural view of a lower ring lap and an upper ring locating block of a combined piston top land ring according to an embodiment of the present 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-upper lapping; 9-lower overlap.
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 piston ring 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 engine 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 piston 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 piston ring can improve the dynamic performance of the internal combustion engine, reduce HC emission index and lubricating oil consumption rate, enhance the heat dissipation effect, reduce the wear rate of the piston ring and prolong the service life of the ring. In particular, 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.
The invention discloses a combined piston top land 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 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 outer circumference of the upper end surface of the first piston ring is provided with a piston top bank which plays a role in reducing emission.
Wherein the first piston ring is an L-shaped cylindrical ring;
wherein the height of the top land of the piston is larger than that of a piston groove for installing a piston ring;
the outer circle of the top land of the piston is an inward inclined conical surface;
wherein the taper of the outer circular inner conical surface of the piston top land is 15-75 degrees, for example 45 degrees.
The top of the inner circular surface of the first piston ring is provided with a ring groove;
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 outer inclined conical surface, and the outer circumference lower ring surface of the second piston ring is an inner 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 combined piston top land ring.
The invention also discloses an internal combustion engine, which comprises the combined piston top land ring.
The invention also discloses a sealing method of the piston of the internal combustion engine, which adopts the combined piston top shore ring to seal the movable piston.
In one embodiment of the present invention, the present invention adopts the following technical scheme, for example:
the invention discloses a combined piston top land ring design suitable for a piston ring top land ring of an internal combustion engine. Specifically, an upper piston ring (i.e., a first piston ring) and a lower piston ring (i.e., a second piston ring) are included. The method is characterized in that: the upper piston ring is a positive twist L-shaped eccentric barrel surface ring, and the section of the upper piston ring is in an inverted ladder shape; the lower piston ring is a conical surface ring, and the section of the lower piston ring is in a positive stepped shape; the piston ring assembly body is axially provided with a through lap; the upper piston ring and the lower piston ring can also be made of different materials according to different requirements.
In another embodiment of the present invention, the present invention adopts the following technical scheme, for example: the invention discloses a combined piston top shore ring suitable for an internal combustion engine, which comprises an upper piston ring and a lower piston ring, wherein the upper piston ring and the lower piston ring are axially fixed and are movably connected in a matched manner by virtue of two-ring elasticity and a stop structure; the upper piston ring is provided with a first limiting block, the lower piston ring is also provided with a second limiting block, and the limiting blocks (namely the first limiting block and the second limiting block) of the two piston rings are matched with the lap joint (namely the second lap joint and the first lap joint) of the opposite side ring to form circumferential fixation.
Wherein the upper piston ring is a positive torsion ring, and a stepped ring groove is formed in the inner upper end surface of the upper piston ring; the section is of an inverted ladder type, and the outer circular surface is of an L-shaped structure of an eccentric barrel surface.
The section of the lower piston ring is of a step type, and the outer circular surface is of a conical surface structure.
Wherein the opening parts of the upper piston ring and the lower piston ring are kept staggered from each other and form 180 degrees.
The contact surface of the upper piston ring and the lower piston ring is a conical surface with complementary matching degree, and the surface of the contact surface is frosted.
In still another embodiment of the present invention, the present invention adopts, for example, the following technical scheme:
the invention aims to provide a piston top land ring with high sealing performance and long service life and excellent oil scraping and distributing capability, which can realize high sealing of a combustion chamber in a cylinder, reduce HC emission of tail gas, solve the problems of engine power reduction, high engine oil consumption and difficult lubrication of the upper part of a cylinder sleeve, improve the service life of a piston ring, reduce the pollution of gas in the cylinder to engine oil 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 an internal combustion engine.
In order to achieve the technical effects, the invention discloses a double-piece combined piston top shore ring which is designed into a two-piece structure with upper and lower piston rings matched.
The combined structure of the upper piston ring and the lower piston ring: the contact surfaces of the two piston rings are mutually matched inclined contact surfaces, the main body section of the upper piston ring is in an inverted stepped shape, the outer ring surface is a barrel surface, the upper section ring of the inner ring surface is propped open with a 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 piston ring is a forward stepped shape, the stepped upper section of the outer circular surface is an outward inclined conical surface with the taper of 15-75 degrees, preferably 45 degrees, which is mutually matched with the inner circular surface of the upper piston ring, and the stepped lower section is a barrel surface; the outer circles of the two piston rings and the cylinder sleeve form a cavity (namely an 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 also facilitated, so that the effects of lubrication and sealing are achieved. The two piston rings are matched with the ring lap joint on the opposite side by adopting limiting blocks on the rings.
The upper piston ring and the lower piston ring are tightly attached through the elasticity of the rings and the conical matching surface, have no through opening, and simultaneously form a labyrinth effect through the multi-layer sealing of the stepped contact surface, so that the sealing effect is enhanced;
the contact surfaces of the upper piston ring and the lower piston ring are subjected to surface frosting treatment so as to ensure the tight axial connection of the two piston rings in the working process;
the upper piston ring is an L-shaped ring, the L-shaped arm of the upper piston ring is higher than the piston ring groove, and the L-shaped arm is flush with the piston top in a power stroke; the contact surfaces of the upper piston ring and the lower piston ring are 15-75 degrees, preferably 45 degrees taper, and surface frosting treatment is adopted to ensure the tight joint of the two piston 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 contact surfaces of the upper piston ring and the lower piston ring are equal;
wherein, the axial height of the step-shaped contact surfaces of the upper piston ring and the lower piston ring is equal.
Wherein the step axial heights of the lower piston rings are equal;
the first lap opening of the upper piston ring and the second lap opening of the lower piston ring are staggered by 180 degrees;
the upper piston ring material needs to be subjected to surface treatment, and the upper piston ring and the lower piston 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. 1-9, the present invention may be implemented in a manner that a combined piston ring assembly includes an upper piston ring 1 and a lower piston ring 2 mounted on a piston 3, wherein the outside of the piston 3 is a cylinder liner 4, an upper lap opening 8 is provided on the upper piston ring 1, a lower lap opening 9 is provided on the lower piston ring 2, and the upper lap opening 8 and the lower lap opening 9 are assembled in a staggered manner; the section of the upper piston ring 1 is in an inverted ladder shape, and a 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 is complete.
The surface of the upper piston ring 1 is subjected to surface treatment; if the upper and lower piston rings are made of different materials, the material of the upper piston ring 1 should have a thermal expansion coefficient alpha 1 smaller than the thermal expansion coefficient alpha 2 of the material of the lower piston ring.
The inverted stepped contact surface of the upper piston ring 1 comprises the upper end surface of the upper piston ring 1 and the lower end surface of the upper piston ring 1, and the stepped contact surface of the lower piston ring 2 comprises the upper end surface of the lower piston ring 2 and the lower end surface of the lower piston ring 2.
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 the 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 with each other in the axial direction through the grinding conical surface matching surface 5 and the elasticity of the two rings.
The step surface on the upper piston ring 1 is provided with a limiting block on the opposite side of the lap joint along the radial direction, and the step on the opposite side of the lap joint of the step-shaped outer circular surface of the lower piston ring 2 is provided with a limiting block matched with the lap joint of the upper piston ring 1. 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 state that the opening of the upper piston ring 1 and the lap opening of the lower piston ring 2 are staggered by 180 degrees to be assembled in the piston 3.
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 pressure-reducing oil storage cavity is formed between the lower piston ring and the cylinder sleeve.
Wherein, the upper piston ring 1 is an L-shaped ring, the L-shaped arm of the upper piston ring should be higher than the piston ring groove, and the L-shaped arm should be flush with the piston top in the power stroke; 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 (24)
1. A combined piston top land 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 outer circumference of the upper end surface of the first piston ring is provided with a piston top bank which plays a role in reducing emission;
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;
the top of the inner circular surface of the first piston ring is provided with a ring groove, so that positive torsion moment is generated by the first piston ring;
the inner circumference lower ring surface of the first piston ring is an inner inclined conical surface, the outer circumference upper ring surface of the second piston ring is an outer inclined conical surface, the outer circumference lower ring surface of the second piston ring is an inner inclined conical surface, and the conical surface is frosted so as to match with the positive torsion moment of the first piston ring and the elasticity between the first piston ring and the second piston ring to strengthen the axial connection of the first piston ring and the second piston ring and reduce the air leakage of the joint of the first piston ring and the second piston ring.
2. The modular piston top land ring of claim 1, wherein:
the first piston ring is an L-shaped cylindrical ring.
3. The modular piston top land ring of claim 2, wherein:
the height of the piston top land is larger than the piston groove for installing the piston ring.
4. The modular piston top land ring of claim 2, wherein:
the outer circle of the top of the piston is an inner inclined conical surface.
5. The modular piston top land ring of claim 4, wherein:
the taper of the outer circular inner inclined conical surface of the top land of the piston is 15-75 degrees.
6. The modular piston top land ring of claim 4, wherein:
the taper of the outer circular inner inclined conical surface of the top land of the piston is 45 degrees.
7. The modular piston top land ring of claim 1, wherein:
the first piston ring has a lower coefficient of thermal expansion than the second piston ring.
8. The modular piston top land ring of claim 1, wherein:
the upper annular surface of the outer circumference of the first piston ring is a barrel surface.
9. The modular piston top land ring of claim 8, 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.
10. The modular piston top land ring of claim 9, wherein:
the conicity of the inner inclined conical surface and the outer inclined conical surface is 45 degrees.
11. The modular piston top land ring of claim 9, 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.
12. The modular piston top land ring of claim 1, wherein:
the first piston ring is located above the second piston ring.
13. The modular piston top land ring of claim 1, wherein:
the included angle between the first lap joint and the second lap joint is 180 degrees.
14. The modular piston top land ring of claim 1, wherein:
the first piston ring is in a positive twist inverted stepped shape.
15. The modular piston top land ring of claim 1, wherein:
the second piston ring is in a negative torsion inverted stepped shape.
16. The modular piston top land 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.
17. The modular piston top land ring of claim 16, wherein:
the barrel surface axis of the first piston ring is below the central axis.
18. The modular piston top land ring of claim 16, 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.
19. The modular piston top land ring of claim 16, 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.
20. The modular piston top land ring of claim 16, 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.
21. The modular piston top land ring of claim 16, 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.
22. A piston assembly comprising a modular piston top land ring as claimed in any one of claims 1 to 21.
23. An internal combustion engine comprising a modular piston top land ring as claimed in any one of claims 1 to 21.
24. A method of sealing a piston of an internal combustion engine, wherein a combination piston top land ring as claimed in any one of claims 1 to 21 is used to seal a movable piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910475849.7A CN110145598B (en) | 2019-06-03 | 2019-06-03 | Combined piston top land ring, piston assembly, internal combustion engine and sealing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910475849.7A CN110145598B (en) | 2019-06-03 | 2019-06-03 | Combined piston top land ring, piston assembly, internal combustion engine and sealing method |
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| CN110145598A CN110145598A (en) | 2019-08-20 |
| CN110145598B true CN110145598B (en) | 2024-02-09 |
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| CN201910475849.7A Active CN110145598B (en) | 2019-06-03 | 2019-06-03 | Combined piston top land ring, piston assembly, internal combustion engine and sealing method |
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Citations (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB531345A (en) * | 1939-07-19 | 1941-01-02 | Wellworthy Piston Rings Ltd | Improvements relating to piston-rings |
| US3542376A (en) * | 1968-03-14 | 1970-11-24 | Sealed Power Corp | Piston and ring construction |
| US3704893A (en) * | 1970-09-04 | 1972-12-05 | Eaton Corp | Piston ring |
| US3834719A (en) * | 1970-10-27 | 1974-09-10 | Nippon Piston Ring Co Ltd | Piston head assembly having an l-shaped piston ring |
| US4346685A (en) * | 1979-01-23 | 1982-08-31 | Kawasaki Jukogyo Kabushiki Kaisha | Internal combustion engine with gas sealing device |
| JPS62251455A (en) * | 1986-04-24 | 1987-11-02 | Mazda Motor Corp | Reciprocating piston engine |
| CN2325534Y (en) * | 1998-04-08 | 1999-06-23 | 蔡平 | Sealing type and self-lubricating ladder-shaped combination piston ring |
| RU2156905C1 (en) * | 1999-01-19 | 2000-09-27 | Бирюков Петр Фетисович | Piston ring |
| JP2005264978A (en) * | 2004-03-16 | 2005-09-29 | Toyota Motor Corp | Pressure ring |
| JP2005351460A (en) * | 2004-06-14 | 2005-12-22 | Toyota Motor Corp | Piston ring |
| CN200943533Y (en) * | 2006-08-28 | 2007-09-05 | 中国南车集团戚墅堰机车车辆厂 | Internal combustion engine diesel engine cylinder with abrasive-reducing ring |
| KR100774733B1 (en) * | 2006-12-07 | 2007-11-08 | 현대자동차주식회사 | Rotatable piston ring device |
| CN201314376Y (en) * | 2008-12-26 | 2009-09-23 | 樊新 | Piston ring |
| CN201671719U (en) * | 2010-05-13 | 2010-12-15 | 张黎明 | Stepping type piston ring for internal combustion engine |
| RU2412367C1 (en) * | 2009-10-12 | 2011-02-20 | Государственное образовательное учреждение высшего профессионального образования Казанский государственный технический университет им. А.Н. Туполева (КГТУ им. А.Н. Туполева) | Piston seal for internal combustion engine |
| CN102116213A (en) * | 2010-01-05 | 2011-07-06 | 陆懋增 | L-shaped piston ring of internal combustion engine |
| CN202690244U (en) * | 2012-06-06 | 2013-01-23 | 王松正 | Anti-leakage sealing piston ring |
| DE102013205908A1 (en) * | 2013-04-04 | 2014-10-09 | Federal-Mogul Burscheid Gmbh | Minute piston ring with a groove |
| CN205064111U (en) * | 2015-06-09 | 2016-03-02 | 陆懋增 | L type multipiece ring for internal -combustion engine |
| CN106286002A (en) * | 2015-06-09 | 2017-01-04 | 陆懋增 | A kind of internal combustion engine L-type multipiece ring |
| CN207568722U (en) * | 2017-11-21 | 2018-07-03 | 王德国 | A kind of biplate multiple-piece piston-ring |
| CN210240531U (en) * | 2019-06-03 | 2020-04-03 | 天津大学 | Combined piston top land ring, piston assembly and internal combustion engine |
-
2019
- 2019-06-03 CN CN201910475849.7A patent/CN110145598B/en active Active
Patent Citations (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB531345A (en) * | 1939-07-19 | 1941-01-02 | Wellworthy Piston Rings Ltd | Improvements relating to piston-rings |
| US3542376A (en) * | 1968-03-14 | 1970-11-24 | Sealed Power Corp | Piston and ring construction |
| US3704893A (en) * | 1970-09-04 | 1972-12-05 | Eaton Corp | Piston ring |
| US3834719A (en) * | 1970-10-27 | 1974-09-10 | Nippon Piston Ring Co Ltd | Piston head assembly having an l-shaped piston ring |
| US4346685A (en) * | 1979-01-23 | 1982-08-31 | Kawasaki Jukogyo Kabushiki Kaisha | Internal combustion engine with gas sealing device |
| JPS62251455A (en) * | 1986-04-24 | 1987-11-02 | Mazda Motor Corp | Reciprocating piston engine |
| CN2325534Y (en) * | 1998-04-08 | 1999-06-23 | 蔡平 | Sealing type and self-lubricating ladder-shaped combination piston ring |
| RU2156905C1 (en) * | 1999-01-19 | 2000-09-27 | Бирюков Петр Фетисович | Piston ring |
| JP2005264978A (en) * | 2004-03-16 | 2005-09-29 | Toyota Motor Corp | Pressure ring |
| JP2005351460A (en) * | 2004-06-14 | 2005-12-22 | Toyota Motor Corp | Piston ring |
| CN200943533Y (en) * | 2006-08-28 | 2007-09-05 | 中国南车集团戚墅堰机车车辆厂 | Internal combustion engine diesel engine cylinder with abrasive-reducing ring |
| KR100774733B1 (en) * | 2006-12-07 | 2007-11-08 | 현대자동차주식회사 | Rotatable piston ring device |
| CN201314376Y (en) * | 2008-12-26 | 2009-09-23 | 樊新 | Piston ring |
| RU2412367C1 (en) * | 2009-10-12 | 2011-02-20 | Государственное образовательное учреждение высшего профессионального образования Казанский государственный технический университет им. А.Н. Туполева (КГТУ им. А.Н. Туполева) | Piston seal for internal combustion engine |
| CN102116213A (en) * | 2010-01-05 | 2011-07-06 | 陆懋增 | L-shaped piston ring of internal combustion engine |
| CN201671719U (en) * | 2010-05-13 | 2010-12-15 | 张黎明 | Stepping type piston ring for internal combustion engine |
| CN202690244U (en) * | 2012-06-06 | 2013-01-23 | 王松正 | Anti-leakage sealing piston ring |
| DE102013205908A1 (en) * | 2013-04-04 | 2014-10-09 | Federal-Mogul Burscheid Gmbh | Minute piston ring with a groove |
| CN205064111U (en) * | 2015-06-09 | 2016-03-02 | 陆懋增 | L type multipiece ring for internal -combustion engine |
| CN106286002A (en) * | 2015-06-09 | 2017-01-04 | 陆懋增 | A kind of internal combustion engine L-type multipiece ring |
| CN207568722U (en) * | 2017-11-21 | 2018-07-03 | 王德国 | A kind of biplate multiple-piece piston-ring |
| CN210240531U (en) * | 2019-06-03 | 2020-04-03 | 天津大学 | Combined piston top land ring, piston assembly and internal combustion engine |
Non-Patent Citations (2)
| Title |
|---|
| 柴油机活塞环结构及配合对机油消耗影响研究;尹必峰;汪博文;钱晏强;吴立来;宋建华;;内燃机工程(第05期);139-144页 * |
| 高效组合式活塞环的研究;单绍平;;郑州铁路职业技术学院学报;20070920(第03期);6-7页 * |
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