CN215633375U - Combined structure of piston and piston ring for increasing oil return - Google Patents
Combined structure of piston and piston ring for increasing oil return Download PDFInfo
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- CN215633375U CN215633375U CN202120051150.0U CN202120051150U CN215633375U CN 215633375 U CN215633375 U CN 215633375U CN 202120051150 U CN202120051150 U CN 202120051150U CN 215633375 U CN215633375 U CN 215633375U
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Abstract
The embodiment of the application discloses a combined structure of a piston and a piston ring for increasing oil return, which is used for solving the phenomenon of oil suck-back caused by long-time idling operation of a gas engine. The method comprises the following steps: the piston comprises a piston body, a piston ring assembly and a cylinder sleeve; the piston ring assembly comprises a first ring, a second ring and a third ring, the first ring is used for keeping the seal between the piston body and the cylinder sleeve, and the second ring and the third ring are used for scraping engine oil attached to the cylinder wall; the piston body is arranged in the cylinder sleeve, and the first ring, the second ring and the third ring are sequentially embedded into the piston ring groove of the piston body from top to bottom; the second ring is a nose-shaped ring structure; the outer end of the piston ring bank at the bottom of the oil scraper ring groove of the piston body is provided with an axial oil return hole, and the axial oil return hole is used for increasing the axial oil return area.
Description
Technical Field
The embodiment of the application relates to the technical field of engines, in particular to a combined structure of a piston and a piston ring for increasing oil return.
Background
The piston ring is a core component in the interior of a fuel engine, and completes the sealing of fuel gas together with a cylinder, a piston, a cylinder wall and the like. According to functional classification, piston rings are divided into two categories: a compression ring and an oil ring. The compression ring can be used for sealing the combustible mixed gas in the combustion chamber; the oil ring is used to scrape off the excessive oil on the cylinder. The piston ring is a metal elastic ring with large outward expansion deformation, is embedded in the piston groove, and is in reciprocating and rotating motion, and forms sealing between the outer circular surface of the ring and the cylinder and one groove surface of the ring and the ring groove by means of pressure difference of gas or liquid.
When the gas engine runs at idle speed, in order to save energy consumption, the opening degree of a throttle valve is small, large negative pressure is formed in a combustion chamber due to poor combustion of gas in a cylinder, and if the idle time of the gas engine is long, the phenomenon of suck-back of engine oil can be generated, and meanwhile, the emission of a PN value can be increased. At present, the occurrence probability of oil leakage is generally reduced from the sealing structure of the piston ring or the wear resistance of the piston ring, but the two solutions can only solve the problem that the engine oil in the crankcase can flow up to the combustion chamber when the negative pressure of the gas engine is less than-50 kpa and the idle time is short, and if the idle running duration of the engine is further prolonged or the negative pressure in the combustion chamber is further reduced, the sealing and discharging requirements are difficult to meet.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a combined structure of a piston and a piston ring for increasing oil return, which is used for solving the phenomenon of oil suck-back caused by long-time idling operation of a gas engine.
In order to achieve the above purpose, the present application provides the following technical solutions:
a kind of composite structure which increases the piston and piston ring which returns the oil, including: the piston comprises a piston body 1, a piston ring assembly 2 and a cylinder sleeve 3;
the piston ring assembly comprises a first ring, a second ring and a third ring;
the piston body is arranged in the cylinder sleeve, and the first ring, the second ring and the third ring are sequentially embedded into a piston ring groove of the piston body from top to bottom;
the second ring is a nose-type ring structure;
the piston body is characterized in that an axial oil return hole is formed in the outer end of a piston ring bank at the bottom of the oil scraper ring groove and used for increasing the axial oil return area.
Optionally, the lateral clearance distance of first ring and piston ring groove is 0.08mm ~ 0.14mm, the lateral clearance distance of second ring and piston ring groove is 0.06mm ~ 0.1mm, the lateral clearance distance of third ring and piston ring groove is 0.04mm ~ 0.08 mm.
Optionally, a gap distance between the outer end face of the piston ring land of the piston body and the cylinder sleeve is 0.3 mm.
Optionally, the number of the axial oil return holes is 6-8.
Optionally, the opening of the first ring is in a shape of a stepped opening.
Optionally, a semi-mosaic structure coating is arranged on the outer circumferential surface of a contact part of the piston ring body of the piston ring assembly and the cylinder sleeve, and the semi-mosaic structure coating is used for increasing the wear resistance of the piston ring.
Optionally, the axial oil return hole is of an arc-shaped structure, and an opening of the axial oil return hole is back to the inner side surface of the piston body.
Optionally, the semi-mosaic structure coating is a wear-resistant chromium plating coating.
Optionally, the diameter of the opening of the axial oil return hole is 4 mm-8 mm.
Optionally, the axial oil return hole is of a semicircular structure.
In above technical scheme, the first ring of piston ring subassembly adopts single face trapezoidal ring structure, the up end is the trapezoidal face, be favorable to increasing the leakproofness of piston ring, the second way ring is nose type ring structure, because the bight portion of nose type ring structure, the frizing ability that makes the second way ring can further promote than the conical surface structure, axial oil gallery has been seted up to the outer end at the piston ring bank of the frizing tank bottom of piston body simultaneously, increase axial oil return area, be favorable to the second way ring like this, the oil pan can in time be got back to the machine oil that the third way ring scraped off, effectively avoid the machine because the machine oil suck-back phenomenon that causes when the idling operation for a long time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a combined piston body and cylinder liner provided by an embodiment of the present application;
FIG. 2 is a schematic structural view of a piston ring assembly provided by an embodiment of the present application;
FIG. 3 is a schematic view of a piston ring body having a chromium-plated coating according to an embodiment of the present disclosure;
FIG. 4 is a partially enlarged structural view of a cross section of a first ring according to an embodiment of the present application;
fig. 5 is a schematic perspective view of a piston according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiments described below do not limit the scope of the utility model described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the utility model described in the claims.
The embodiment of the application provides a piston and piston ring combined structure for increasing oil return, which is used for solving the phenomenon of oil suck-back caused by long-time idling operation of a gas engine.
Referring to fig. 1 to 5, a piston and piston ring assembly for increasing oil return includes: the piston comprises a piston body 1, a piston ring assembly 2 and a cylinder sleeve 3; the piston ring assembly 2 comprises a first ring 21, a second ring 22 and a third ring 23; the piston body 1 is arranged in the cylinder sleeve 3, and the first ring 21, the second ring 22 and the third ring 23 are sequentially embedded into a piston ring groove of the piston body 1 from top to bottom; the first ring 21 is mainly used for keeping the sealing between the piston body 1 and the cylinder wall and controlling air leakage to the minimum, and the second ring 22 and the third ring 23 are used for scraping off engine oil attached to the cylinder wall, so that the engine keeps normal oil consumption, the supplied engine oil is prevented from being sucked into a combustion chamber when being excessive, the oil consumption is increased, and unnecessary carbon deposition caused by engine oil combustion is prevented, and the performance of the engine is prevented from being influenced.
In the technical scheme, the lateral clearance distance between the first ring 21 and the piston ring groove is 0.08-0.14 mm, the lateral clearance distance between the second ring 22 and the piston ring groove is 0.06-0.1 mm, and the lateral clearance distance between the third ring 22 and the piston ring groove is 0.04-0.08 mm. Since the inclination angle of the upper end surface of the first ring 21 is different from the inclination angle of the top of the piston ring groove, the lower end surface and the piston ring
The bottom plane in groove is parallel, when the piston moves in reciprocating, the lower terminal surface easily forms combustion chamber carbon deposit, can reduce the sealing performance of piston ring like this, through reducing the side clearance between piston ring and the piston ring groove, can reduce machine oil and scurry the area of passageway like the combustion chamber, form the even oil film of one deck thickness more easily on the cylinder wall of cylinder liner simultaneously, improved the lubricated effect of piston ring subassembly 2 ascending in-process and cylinder liner, the friction and the wearing and tearing of piston ring subassembly 2 and cylinder liner 3 have been reduced, when piston ring subassembly 2 descends, the oil distribution surface reduces, make the remaining oil film on the cylinder wall thinner, can reduce machine oil consumption, remedy the not enough in the aspect of the sealing capacity that first way ring 21 single face trapezoidal ring structure brought.
In the technical scheme, the clearance distance between the outer end face of the piston ring land of the piston body 1 and the cylinder sleeve 3 is 0.3 mm. Because axial oil return hole 11 has been seted up to the outer end of the piston ring bank of the scraper ring tank bottom portion of piston body 1, can further reduce the clearance between cylinder liner 3 and the outer terminal surface of piston ring bank to 0.3mm, no longer need increase the oil return area through the clearance that increases piston ring bank and cylinder liner 3, promote the stability of piston body 1 at the operation of cylinder liner 3, also reduce the noise that piston body 1 strikeed cylinder liner 3.
Referring to fig. 5, in the technical scheme, the number of the axial oil return holes 11 is 6-8, and the axial oil return holes are distributed reasonably and uniformly along the outer end face of the piston ring bank, so that the axial oil return area is increased.
In the technical scheme, the opening of the first ring 21 is in a step opening shape, and the main path of the gas in the cylinder leaking into the crankcase is the opening of the piston ring, so that the opening of the first ring 21 is in the step opening shape, coking deposited in the first ring can be extruded out, the ring is prevented from being broken, and the air tightness of the piston ring assembly 2 is improved.
Referring to fig. 4, in the technical scheme, a semi-mosaic structure coating 24 is arranged on the outer circular surface of the contact part of the piston ring body of the piston ring assembly 2 and the cylinder sleeve 3, and the semi-mosaic structure coating 24 is used for increasing the wear resistance of the piston ring assembly 2. Because the whole outer surface of the piston ring is not contacted with the inner side surface of the cylinder sleeve 3, the wear-resistant coating is only added on the part of the outer circle surface of the piston ring contacted with the cylinder sleeve 3, and the manufacturing cost of the piston ring can be further reduced.
Referring to fig. 1, in the technical solution, the axial oil return hole 11 is an arc-shaped structure, an opening of the axial oil return hole 11 faces away from an inner side surface of the piston body 1, and the arc-shaped structure is beneficial to increasing an axial oil return area.
In the technical scheme, the semi-mosaic structure coating 24 is a wear-resistant chromium plating coating, the chromium plating layer has the characteristics of fine, compact and smooth crystallization, high hardness, strong corrosion resistance and oxidation resistance, and can improve the wear resistance of the piston ring and prolong the service life of the piston ring.
In the technical scheme, the opening diameter of the axial oil return hole 11 is 4-8 mm.
Referring to fig. 1, in the technical solution, the axial oil return hole 11 is a semicircular structure.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used only for explaining relative positional relationships between the respective members or components, and do not particularly limit specific mounting orientations of the respective members or components.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In addition, the structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are intended to be illustrative only and are not intended to be limiting, since the same are not intended to be exhaustive or to limit the scope of the utility model, which is defined by the appended claims, and therefore all changes in structure, proportion, and size which are within the range of the disclosed technology are not necessarily to scale.
Claims (10)
1. The utility model provides an increase piston and piston ring's integrated configuration of machine oil return which characterized in that includes: the piston comprises a piston body, a piston ring assembly and a cylinder sleeve;
the piston ring assembly comprises a first ring, a second ring and a third ring, wherein the first ring is used for keeping the seal between the piston body and the cylinder sleeve, and the second ring and the third ring are used for scraping off engine oil attached to the cylinder wall;
the piston body is arranged in the cylinder sleeve, and the first ring, the second ring and the third ring are sequentially embedded into a piston ring groove of the piston body from top to bottom;
the second ring is a nose-type ring structure;
the piston body is characterized in that an axial oil return hole is formed in the outer end of a piston ring bank at the bottom of the oil scraper ring groove and used for increasing the axial oil return area.
2. The composite structure of claim 1, wherein the first ring and ring groove have a lateral clearance distance of 0.08mm to 0.14mm, the second ring and ring groove have a lateral clearance distance of 0.06mm to 0.1mm, and the third ring and ring groove have a lateral clearance distance of 0.04mm to 0.08 mm.
3. The combination according to claim 1, wherein the clearance distance between the outer end face of the piston ring land of the piston body and the cylinder liner is 0.3 mm.
4. The combination according to claim 1, wherein the number of the axial oil return holes is 6-8.
5. The composite structure of any one of claims 1 to 4, wherein the opening of the first collar is stepped.
6. The combination according to any one of claims 1 to 4, wherein the outer circumferential surface of the piston ring body of the piston ring assembly contacting the cylinder liner is provided with a semi-mosaic coating for increasing the wear resistance of the piston ring.
7. The combination according to any one of claims 1 to 4, wherein the axial oil return hole has an arc-shaped configuration, and an opening of the axial oil return hole faces away from the inner side surface of the piston body.
8. The composite structure of claim 6 wherein said semi-damascene structural coating is a wear resistant chrome coating.
9. The combination according to claim 7, wherein the axial oil return hole has an opening diameter of 4mm to 8 mm.
10. The combination according to claim 9 wherein said axial oil return hole is a semi-circular configuration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120051150.0U CN215633375U (en) | 2021-01-08 | 2021-01-08 | Combined structure of piston and piston ring for increasing oil return |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120051150.0U CN215633375U (en) | 2021-01-08 | 2021-01-08 | Combined structure of piston and piston ring for increasing oil return |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796903A (en) * | 2021-01-08 | 2021-05-14 | 广西玉柴机器股份有限公司 | Combined structure of piston and piston ring for increasing oil return |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112796903A (en) * | 2021-01-08 | 2021-05-14 | 广西玉柴机器股份有限公司 | Combined structure of piston and piston ring for increasing oil return |
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