CN104929800A - Piston oil returning device and method - Google Patents
Piston oil returning device and method Download PDFInfo
- Publication number
- CN104929800A CN104929800A CN201410108390.4A CN201410108390A CN104929800A CN 104929800 A CN104929800 A CN 104929800A CN 201410108390 A CN201410108390 A CN 201410108390A CN 104929800 A CN104929800 A CN 104929800A
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- oil
- piston
- drainback passage
- ring groove
- circle portion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses a piston oil returning device and method applicable to an opposed piston two-stroke engine. One or more oil returning channels are arranged at the bottom of an oil ring groove of a piston skirt unequally. The number of the oil returning channels arranged on the upper semi-circle portion of the bottom of the oil ring groove is smaller than that of the oil returning channels arranged on the lower semi-circle portion of the bottom of the oil ring groove. Engine oil at the bottom of the oil ring groove flows back to an engine oil shell through the oil returning channels at the bottom of the oil ring groove. According to the technical scheme, the effective area of the engine oil returning channels on the lower semi-circle portion of a piston is greatly increased, and the piston oil returning device well adapts to the situation that engine oil of the lower half portion of the piston of the opposed piston engine is more than that of the upper half portion of the piston of the opposed piston engine, effectively improves the engine oil returning efficiency of the lower half portion of the piston, increases the total engine oil returning amount, and thus reduces the engine oil consumption of the opposed piston two-stroke engine.
Description
Technical field
The present invention relates to technical field of internal combustion engines, particularly relate to a kind of piston oil return apparatus and method.
Background technique
Opposed pistons two stroke engine is arranged in same cylinder by two piston horizon glass pictures, and two pistons are driven by respective connecting rod respectively.According to piston installation on the engine and motion state, install and horizontal movement state because piston is in level, in reciprocating motion of the pistons process, the machine oil be attached in cylinder wall surface can be wiped off by the oil ring being positioned at piston skirt, meanwhile, last one compression ring being positioned at piston skirt also can be assisted and be wiped a part of machine oil off.The machine oil that oil piston ring and compression ring are wiped off is gathered in oil ring groove and last nasal bridge region together between compression ring annular groove and oil ring groove.If the machine oil that oil ring and compression ring scrape off is gathered in oil ring groove and nasal bridge region and can not promptly excludes, then when the suction port of these regions on cylinder and relief opening, these machine oil just pass back into air-inlet cavity and exhaust cavity, the machine oil entering air-inlet cavity can enter firing chamber along with charge air flow, cause burn oil, the machine oil entering exhaust cavity directly will discharge air along with gas of combustion, cause engine oil consumption high, the consequences such as deterioration of emission.
The piston oil return oilhole of tradition opposed piston type engine is evenly arranged in the machine oil that bottom nasal bridge region and oil piston ring annular groove, oil ring and compression ring scrape off to flow back into machine oil shell by the machine oil spill port be evenly arranged in bottom nasal bridge region and oil piston ring annular groove.But, because piston is horizontal arrangement, necessarily flow to lower half portion of oil piston ring annular groove and nasal bridge region under gravity along oil ring groove and annular nasal bridge region by the machine oil that oil piston ring and compression ring scrape off, cause, lower half portion machine oil of piston oil slot and nasal bridge region is many, upper half part machine oil is few, and equally distributed machine oil spill port can not adapt to the oil return flow of varying number machine oil well.
Due to cylinder, piston horizontal positioned, compared with conventional engines, machine oil for lubrication and cooling piston can not flow back into oil sump in time under self gravitation effect, simultaneously, piston iterates through the porting on cylinder in the course of the work, causes piston ring constantly to be pumped into by machine oil in cylinder and in intake and exhaust chamber, causes the engine oil consumption of opposed pistons two stroke engine to increase, deterioration of emission, governs widely using of such motor.
Summary of the invention
The object of the invention is to the shortcoming and defect overcoming prior art, a kind of piston oil return apparatus and method are provided, effectively can increase the machine oil backflow efficiency of piston lower half portion, improve overall machine oil recirculating oil quantity, and then reduce the machine oil oil consumption of opposed pistons two stroke engine.
The invention provides a kind of piston oil return apparatus, be applicable to opposed pistons two stroke engine, arrange bottom the oil ring groove of described piston skirt and be no less than 1 drainback passage, described drainback passage skewness.
The oil ring groove of described piston arranges between compression ring annular groove and is no less than 1 drainback passage, described drainback passage skewness together with last.
The drainback passage quantity that upper semi-circle portion bottom described oil ring groove is arranged is less than the drainback passage quantity that lower semi-circle portion is arranged.
The drainback passage quantity that the oil ring groove of the described piston upper semi-circle portion together with last between compression ring annular groove is arranged is less than the drainback passage quantity that lower semi-circle portion is arranged.
The drainback passage that upper semi-circle portion bottom described oil ring groove is arranged is spill port, and the drainback passage that the lower semi-circle portion bottom described oil ring groove is arranged is spill port or slit drainback passage.
The drainback passage that the upper semi-circle portion of oil ring groove together with last between compression ring annular groove of described piston is arranged is spill port, and the drainback passage that the lower semi-circle portion of oil ring groove together with last between compression ring annular groove of described piston is arranged is spill port or slit drainback passage.
Present invention also offers a kind of piston oil return method, be applicable to opposed pistons two stroke engine, comprise the following steps:
Arrange unevenly bottom the oil ring groove of described piston skirt and be no less than 1 drainback passage, the drainback passage quantity that the upper semi-circle portion bottom wherein said oil ring groove is arranged is less than the drainback passage quantity that lower semi-circle portion is arranged;
Machine oil bottom described oil ring groove flows back to machine oil shell by the drainback passage bottom described oil ring groove.
Further comprising the steps of:
Arranges unevenly between compression ring annular groove together with last at the oil ring groove of described piston and be no less than 1 drainback passage, the drainback passage quantity that the upper semi-circle portion of oil ring groove together with finally between compression ring annular groove of wherein said piston is arranged is less than the drainback passage quantity that lower semi-circle portion is arranged;
The machine oil of oil ring groove together with last between compression ring annular groove of described piston flows back to machine oil shell by the drainback passage of oil ring groove together with last between compression ring annular groove of described piston.
The drainback passage that upper semi-circle portion bottom described oil ring groove is arranged is spill port, and the drainback passage that the lower semi-circle portion bottom described oil ring groove is arranged is spill port or slit drainback passage.
The drainback passage that the upper semi-circle portion of oil ring groove together with last between compression ring annular groove of described piston is arranged is spill port, and the drainback passage that the lower semi-circle portion of oil ring groove together with last between compression ring annular groove of described piston is arranged is spill port or slit drainback passage.
The quantity in the nasal bridge region spill port between last one compression ring annular groove of piston lower half portion and oil ring groove and oil piston ring annular groove bottom oil return hole increases by the piston oil return apparatus in technical solution of the present invention, or adopt slit structure to further increase the machine oil drainback passage useful area of piston lower half portion, adapt to the situation of piston lower half portion machine oil more than upper half part well, effectively increase the machine oil backflow efficiency of piston lower half portion, improve overall machine oil recirculating oil quantity, and then reduce the machine oil oil consumption of opposed pistons two stroke engine.
Accompanying drawing explanation
Fig. 1 is the structural representation with the piston of spill port in the embodiment of the present invention.
Fig. 2 is the spill port distributed architecture figure in the embodiment of the present invention bottom oil ring groove.
Fig. 3 is oil ring groove spill port distributed architecture figure between compression ring annular groove together with last in the embodiment of the present invention.
Fig. 4 is the structural representation with the piston of spill port and slit drainback passage in the embodiment of the present invention.
Fig. 5 is the distributed architecture figure of spill port in the embodiment of the present invention bottom oil ring groove and slit drainback passage.
Fig. 6 is the spill port of oil ring groove together with last between compression ring annular groove and the distributed architecture figure of slit drainback passage in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.But embodiments of the present invention are not limited thereto.
Fig. 1 is the structural representation with the piston of spill port in the embodiment of the present invention.As shown in Figure 1, this is applicable to the piston oil return apparatus of opposed pistons two stroke engine, comprises oil ring groove 2, is provided with multiple spill port 5 bottom oil ring groove 2; Also comprise last one compression ring annular groove 1 of piston skirt 3, the nasal bridge region 4 between last one compression ring annular groove 1 and oil ring groove 2, the cylindrical of nasal bridge region 4 is circumferentially provided with multiple spill port 6.
Fig. 2 is the spill port distributed architecture figure in the embodiment of the present invention bottom oil ring groove.As shown in Figure 2, the spill port 5 bottom oil ring groove 2 is distributed uneven, and the spill port quantity that the upper semi-circle portion bottom oil ring groove is arranged is less than the spill port quantity that lower semi-circle portion is arranged.Embodiment is: the oilhole distribution of upper half part of piston is more sparse, and comparatively dense is compared in the distribution of the oilhole of lower half portion of piston.
Like this, the machine oil bottom oil ring groove flows back to machine oil shell by the spill port bottom oil ring groove.The piston of horizontally-opposed piston two stroke engine is horizontal arrangement in movement process, and because Action of Gravity Field causes the machine oil of piston lower half portion more, and the machine oil of upper half part is less.The object of such design is to ensure that the machine oil that oil ring scrapes off by piston in reciprocatory movement successfully can flow back into oil sump from spill port, especially the machine oil of lower half portion can flow back to oil sump from the passage compared with books circulation area, significantly reduces the oil consumption of machine oil.
Fig. 3 is oil ring groove spill port distributed architecture figure between compression ring annular groove together with last in the embodiment of the present invention.As shown in Figure 3, the distribution of the cylindrical spill port 6 circumferentially of nasal bridge region 4 is uneven, and the spill port quantity that the oil ring groove of the piston upper semi-circle portion together with last between compression ring annular groove is arranged is less than the spill port quantity that lower semi-circle portion is arranged.Embodiment is: the spill port distribution of upper half part of piston is more sparse, and comparatively dense is compared in the distribution of the spill port of lower half portion of piston.
Like this, the machine oil of the oil ring groove of piston together with last between compression ring annular groove flows back to machine oil shell by the drainback passage of oil ring groove together with last between compression ring annular groove of piston.The piston of horizontally-opposed piston two stroke engine is horizontal arrangement in movement process, and because Action of Gravity Field causes the machine oil of piston lower half portion more, and the machine oil of upper half part is less.The object of such design is to ensure that the machine oil that oil ring scrapes off by piston in reciprocatory movement successfully can flow back into oil sump from spill port, especially the machine oil of lower half portion can flow back to oil sump from the passage compared with books circulation area, significantly reduces the oil consumption of machine oil.
In order to further increase the drainback passage of machine oil, the drainback passage of piston lower half portion can be designed to slit drainback passage.Fig. 4 is the structural representation with the piston of spill port and slit drainback passage in the embodiment of the present invention.Fig. 5 is the distributed architecture figure of spill port in the embodiment of the present invention bottom oil ring groove and slit drainback passage.Fig. 6 is the spill port of oil ring groove together with last between compression ring annular groove and the distributed architecture figure of slit drainback passage in the embodiment of the present invention.
As shown in Figure 4, Figure 5 and Figure 6.The drainback passage that upper semi-circle portion bottom oil ring groove 2 is arranged is spill port, and the drainback passage that the lower semi-circle portion bottom oil ring groove is arranged is slit drainback passage 7.The drainback passage that the upper semi-circle portion of the nasal bridge region 4 between last one compression ring annular groove 1 and oil ring groove 2 is arranged is spill port, and the drainback passage that lower semi-circle portion is arranged is slit drainback passage 8.
The quantity of the spill port of lower half portion of the nasal bridge region finally together between compression ring annular groove and oil ring groove by oil piston ring annular groove bottom oil return hole and piston of the piston oil return apparatus in above-described embodiment increases, or adopt slit drainback passage to considerably increase the machine oil drainback passage useful area of piston lower half portion, adapt to the situation of piston lower half portion machine oil more than upper half part well, effectively increase the machine oil backflow efficiency of piston lower half portion, improve overall machine oil recirculating oil quantity, and then reduce the machine oil oil consumption of opposed pistons two stroke engine.
Above-described embodiment is the present invention's preferably mode of execution; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1. a piston oil return apparatus, is applicable to opposed pistons two stroke engine, it is characterized in that, arranges and be no less than 1 drainback passage, described drainback passage skewness bottom the oil ring groove of described piston skirt.
2. a kind of piston oil return apparatus according to claim 1, is characterized in that, the oil ring groove of described piston arranges between compression ring annular groove and is no less than 1 drainback passage, described drainback passage skewness together with last.
3. a kind of piston oil return apparatus according to claim 1, is characterized in that, the drainback passage quantity that the upper semi-circle portion bottom described oil ring groove is arranged is less than the drainback passage quantity that lower semi-circle portion is arranged.
4. a kind of piston oil return apparatus according to claim 2, is characterized in that, the drainback passage quantity that the oil ring groove of the described piston upper semi-circle portion together with last between compression ring annular groove is arranged is less than the drainback passage quantity that lower semi-circle portion is arranged.
5. a kind of piston oil return apparatus according to claim 3, it is characterized in that, the drainback passage that upper semi-circle portion bottom described oil ring groove is arranged is spill port, and the drainback passage that the lower semi-circle portion bottom described oil ring groove is arranged is spill port or slit drainback passage.
6. a kind of piston oil return apparatus according to claim 4, it is characterized in that, the drainback passage that the upper semi-circle portion of oil ring groove together with last between compression ring annular groove of described piston is arranged is spill port, and the drainback passage that the lower semi-circle portion of oil ring groove together with last between compression ring annular groove of described piston is arranged is spill port or slit drainback passage.
7. a piston oil return method, is applicable to opposed pistons two stroke engine, it is characterized in that, comprise the following steps:
Arrange unevenly bottom the oil ring groove of described piston skirt and be no less than 1 drainback passage, the drainback passage quantity that the upper semi-circle portion bottom wherein said oil ring groove is arranged is less than the drainback passage quantity that lower semi-circle portion is arranged;
Machine oil bottom described oil ring groove flows back to machine oil shell by the drainback passage bottom described oil ring groove.
8. a kind of piston oil return method according to claim 7, is characterized in that, further comprising the steps of:
Arranges unevenly between compression ring annular groove together with last at the oil ring groove of described piston and be no less than 1 drainback passage, the drainback passage quantity that the upper semi-circle portion of oil ring groove together with finally between compression ring annular groove of wherein said piston is arranged is less than the drainback passage quantity that lower semi-circle portion is arranged;
The machine oil of oil ring groove together with last between compression ring annular groove of described piston flows back to machine oil shell by the drainback passage of oil ring groove together with last between compression ring annular groove of described piston.
9. a kind of piston oil return method according to claim 7, it is characterized in that, the drainback passage that upper semi-circle portion bottom described oil ring groove is arranged is spill port, and the drainback passage that the lower semi-circle portion bottom described oil ring groove is arranged is spill port or slit drainback passage.
10. a kind of piston oil return method according to claim 8, it is characterized in that, the drainback passage that the upper semi-circle portion of oil ring groove together with last between compression ring annular groove of described piston is arranged is spill port, and the drainback passage that the lower semi-circle portion of oil ring groove together with last between compression ring annular groove of described piston is arranged is spill port or slit drainback passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410108390.4A CN104929800B (en) | 2014-03-21 | 2014-03-21 | A kind of piston oil return apparatus and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410108390.4A CN104929800B (en) | 2014-03-21 | 2014-03-21 | A kind of piston oil return apparatus and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104929800A true CN104929800A (en) | 2015-09-23 |
| CN104929800B CN104929800B (en) | 2018-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410108390.4A Active CN104929800B (en) | 2014-03-21 | 2014-03-21 | A kind of piston oil return apparatus and method |
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| Country | Link |
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| CN (1) | CN104929800B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0345450U (en) * | 1989-09-12 | 1991-04-26 | ||
| JPH05187312A (en) * | 1991-09-26 | 1993-07-27 | Honda Motor Co Ltd | Piston for internal combustion engine |
| JP2010223005A (en) * | 2009-03-19 | 2010-10-07 | Toyota Central R&D Labs Inc | Piston for internal combustion engine and internal combustion engine |
| CN102042401A (en) * | 2009-10-19 | 2011-05-04 | 宇秀明 | Piston and piston ring group |
| CN103032197A (en) * | 2012-12-21 | 2013-04-10 | 中国兵器工业集团第七0研究所 | Piston oil-return structure of horizontal opposed piston two-stroke internal combustion machine |
-
2014
- 2014-03-21 CN CN201410108390.4A patent/CN104929800B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0345450U (en) * | 1989-09-12 | 1991-04-26 | ||
| JPH05187312A (en) * | 1991-09-26 | 1993-07-27 | Honda Motor Co Ltd | Piston for internal combustion engine |
| JP2010223005A (en) * | 2009-03-19 | 2010-10-07 | Toyota Central R&D Labs Inc | Piston for internal combustion engine and internal combustion engine |
| CN102042401A (en) * | 2009-10-19 | 2011-05-04 | 宇秀明 | Piston and piston ring group |
| CN103032197A (en) * | 2012-12-21 | 2013-04-10 | 中国兵器工业集团第七0研究所 | Piston oil-return structure of horizontal opposed piston two-stroke internal combustion machine |
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| Publication number | Publication date |
|---|---|
| CN104929800B (en) | 2018-07-10 |
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