WO2005059345A1 - 二サイクル内燃機関 - Google Patents
二サイクル内燃機関 Download PDFInfo
- Publication number
- WO2005059345A1 WO2005059345A1 PCT/JP2004/015262 JP2004015262W WO2005059345A1 WO 2005059345 A1 WO2005059345 A1 WO 2005059345A1 JP 2004015262 W JP2004015262 W JP 2004015262W WO 2005059345 A1 WO2005059345 A1 WO 2005059345A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cylinder
- piston
- outer peripheral
- peripheral surface
- axial direction
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
- F02B25/14—Engines characterised by using fresh charge for scavenging cylinders using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke
- F02B25/16—Engines characterised by using fresh charge for scavenging cylinders using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke the charge flowing upward essentially along cylinder wall opposite the inlet ports
-
- 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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/18—Other cylinders
- F02F1/20—Other cylinders characterised by constructional features providing for lubrication
-
- 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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/18—Other cylinders
- F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M3/00—Lubrication specially adapted for engines with crankcase compression of fuel-air mixture or for other engines in which lubricant is contained in fuel, combustion air, or fuel-air mixture
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Definitions
- the present invention relates to a two-cycle internal combustion engine.
- scavenging air in a cylinder is transferred from a scavenging port opening on the inner surface thereof to an exhaust port at the top of the cylinder.
- the scavenging air in the cylinder is directed from the scavenging port opening on the inner surface to the top of the cylinder and then to the exhaust port opening on the inner surface of the cylinder.
- There is a loop or cross-flow type that uses a scavenging flow that flows by force.In the former, the scavenging port that opens on the inner surface of the cylinder opens when the piston comes near the bottom dead center. In the latter case, both the scavenging port and the exhaust port that open to the inner surface of the cylinder are opened when the piston comes near the bottom dead center.
- the entire piston from the top end to the end has a cylindrical shape with no dent on the outer peripheral surface, while the outer peripheral surface of the piston has At the top end, an upper piston ring that is in close contact with the inner wall surface of the cylinder is provided, and at the end, a lower piston ring that is also in close contact with the inner wall surface of the cylinder is provided.
- the scavenging port in the case of a u-flow type in a cylinder, or the scavenging port and the exhaust port (In the case of a loop or cross-flow type), when opened in a portion of the inner wall surface of the cylinder corresponding to the region on the left and right sides of the piston with the piston pin interposed therebetween when viewed from the axial direction of the cylinder,
- the configuration is as follows.
- Patent Document 1 Japanese Utility Model Application No. 5-61440
- the piston pin is sandwiched between the outer peripheral surface of the piston and a portion of the inner wall surface of the cylinder where the scavenging port or the scavenging port and the exhaust port are open.
- the area on both the left and right sides is large.1
- the cylinder inner wall surface and the piston rings of the piston in the portion where the scavenging port or the scavenging port and the exhaust port are opened, and the piston rings of the piston are greatly worn. There was also a problem.
- the invention of claim 1 is directed to opening and closing an opening into the cylinder at a scavenging port to the cylinder or an exhaust port with cylinder force by a piston reciprocating in the cylinder.
- Two-stroke internal combustion engine configured to When viewed from the axial direction of the cylinder, the opening to the inner wall surface of the cylinder at the scavenging port or the exhaust port corresponds to the region on the left and right sides of the piston pin in the axial direction of the outer peripheral surface of the piston.
- a portion of the outer peripheral surface of the piston corresponding to the opening of the scavenging port or the exhaust port, and an inner wall surface of the cylinder.
- An oil reservoir space is formed between the region on both the left and right sides of the axis and the inner wall surface of the cylinder so that the lubricating oil is pushed out! / Puru.
- the invention of claim 2 is the two-stroke internal combustion engine according to claim 1, wherein a plurality of openings to the inner wall surface of the cylinder in the scavenging port or the exhaust port are formed.
- the invention according to claim 3 is the two-stroke internal combustion engine according to claim 1 or 2, wherein the oil reservoir space force S and a portion of the outer peripheral surface of the piston on both left and right sides in the axial direction of the piston pin. It is a form in which is recessed.
- the invention according to claim 4 is the two-stroke internal combustion engine according to claim 1 or 2, wherein the outer peripheral surface of the piston on the left and right sides in the axial direction of the piston pin is in the axial direction of the piston. , And an upper horizontal groove communicating between the upper ends of the vertical grooves, and a lower horizontal groove communicating between the lower ends of the vertical grooves, and the oil groove is formed by the four grooves. That is, a storage space was constructed.
- the invention according to claim 5 is the two-stroke internal combustion engine according to claim 3, wherein the oil reservoir space faces the scavenging port or the exhaust port even when the piston is at the top dead center.
- the configuration of the oil reservoir space is set.
- the invention according to claim 6 is the two-stroke internal combustion engine according to claim 4, wherein the oil reservoir space faces the scavenging port or the exhaust port even when the piston is at the top dead center.
- the configuration of the oil reservoir space is set.
- the invention according to claim 7 is the two-stroke internal combustion engine according to any one of claims 1, 2, 5, and 6, wherein the outer peripheral surface of the piston has its outer peripheral surface viewed from the axial direction of the cylinder.
- the outer peripheral surface of the piston is formed so that the central angle of a sector formed by connecting the region on both the left and right sides in the axial direction of the piston pin with the axis of the cylinder is 120 to 150 degrees.
- the size of the area on the left and right sides of the piston pin in the axial direction is set.On the other hand, when viewed from the axial direction of the cylinder, the area on the left and right sides of the outer peripheral surface of the piston across the piston pin is The size of the area on the right and left sides of the outer peripheral surface of the piston with respect to the piston pin is set so that the central angle of the sector formed by connecting the cylinder axis is 60 to 30 degrees. Things.
- the invention of claim 8 is the two-stroke internal combustion engine according to claim 3, wherein, when viewed from the axial direction of the cylinder, regions on the left and right sides of the outer peripheral surface of the piston in the axial direction of the piston pin. A portion of the outer peripheral surface of the piston on both the left and right sides in the axial direction of the piston pin so that the center angle of the sector formed by connecting the portion and the axis of the cylinder is 120 to 150 degrees.
- the size of the area on the left and right sides of the outer peripheral surface of the piston with respect to the piston pin is set so that the central angle of the piston is 60 to 30 degrees.
- the invention of claim 9 is the two-stroke internal combustion engine according to claim 4, wherein the outer peripheral surface of the piston has regions on both left and right sides in the axial direction of the piston pin in the outer peripheral surface of the piston when viewed from the axial direction of the cylinder. A portion of the outer peripheral surface of the piston on the left and right sides in the axial direction of the piston pin such that the center angle of the fan formed by connecting the portion and the axis of the cylinder is 120 to 150 degrees. While the size of the cylinder is set, a sector formed by connecting the axis of the cylinder to the region on the left and right sides of the outer peripheral surface of the piston on both sides of the piston pin when viewed from the axial direction of the cylinder. The size of the region on the left and right sides of the outer peripheral surface of the piston with the piston pin interposed therebetween is set so that the central angle of the piston becomes 60 to 30 degrees.
- An invention according to claim 10 is the two-cycle internal combustion engine according to any one of claims 1, 2, 5, 6, 8, and 9, wherein the exhaust port having the cylinder force is provided at the top of the cylinder. It was a two-cycle diesel engine.
- An invention according to claim 11 is the two-stroke internal combustion engine according to claim 3, wherein the exhaust port from the cylinder is provided at the top of the cylinder. It is that.
- the invention of claim 12 is the two-stroke internal combustion engine according to claim 4, wherein the two-stroke diesel engine is provided with an exhaust port from the cylinder at the top of the cylinder.
- the invention of claim 13 is the two-stroke internal combustion engine according to claim 7, wherein the two-stroke diesel engine is provided with an exhaust port from the cylinder at the top of the cylinder.
- the opening of the scavenging port or the exhaust port to the inner wall surface of the cylinder is formed by observing the axial force of the cylinder in the axial direction of the piston pin on the outer peripheral surface of the piston.
- the region on the left and right sides of the outer peripheral surface of the piston with the axis of the piston pin interposed therebetween is the scavenging port or the exhaust port on the inner wall surface of the cylinder.
- the portion where the port is not opened is pressed with a large thrust force, and the piston is pressed with a large thrust force with respect to the inner wall surface of the cylinder where the scavenging port or the exhaust port is opened.
- the portion of the inner wall surface of the cylinder where the scavenging port or the exhaust port is open, and the piston The wear of the piston ring can be significantly low reduction.
- the force of the piston is also set between the portion of the outer peripheral surface of the piston corresponding to the opening of the scavenging port or the exhaust port and the inner wall surface of the cylinder.
- the outer peripheral surface of the piston is formed.
- the lubricating oil is strongly pressed to the scavenging port or the exhaust port side by the strong pressing of the region on the left and right sides of the outer peripheral surface of the piston with respect to the axis of the piston pin. Extrusion can be avoided, and the consumption of lubricating oil can be significantly reduced.
- the invention of claims 2 to 5 is a more specific version of the configuration of the invention of claim 1.
- a plurality of small scavenging or exhaust ports are opened on the inner wall surface of the cylinder rather than one large scavenging or exhaust port.
- the piston ring of the piston can be prevented from being caught, which is highly effective in reducing the wear of the biston ring.
- two vertical grooves extending in the axial direction of the piston are formed on the outer peripheral surface of the piston on the left and right sides in the axial direction of the piston pin.
- the oil reservoir space may be surrounded by an upper horizontal groove communicating between upper ends of both vertical grooves and a lower horizontal groove communicating between lower ends of both vertical grooves, and the oil reservoir space may be configured by the four grooves.
- the configuration of the oil storage space is set so that the oil storage space faces the scavenging port or the exhaust port even when the piston is at the top dead center. Therefore, the effect of reducing the consumption of lubricating oil by providing the oil storage space can be further promoted.
- the area of the outer peripheral surface of the piston on both the left and right sides in the axial direction of the piston pin and the axis of the cylinder are formed.
- the size of the region on the left and right sides in the axial direction of the piston pin on the outer peripheral surface of the biston is set so that the central angle of the sector formed by the above is 120 to 150 degrees.
- the outer peripheral surface of the piston is connected to the axial portion of the cylinder on the left and right sides with the piston pin interposed therebetween.
- the size of the area on the left and right sides of the outer peripheral surface of the piston with the piston pin interposed therebetween is set so that the central angle of the fan-shaped formed is 60 to 30 degrees. It is possible to reliably prevent the lubricating oil from being pushed out to the scavenging port or the exhaust port side by strong pressing of the area on the left and right sides of the surface with respect to the axis of the piston pin. It is highly effective in reducing the volume.
- the two-stroke internal combustion engine is a two-stroke diesel engine provided with the exhaust port for the cylinder force at the top of the cylinder, the inner wall surface of the cylinder is provided. Therefore, the amount of lubricating oil consumed by the exhaust port is small.
- FIG. 1 is a longitudinal sectional front view showing a first embodiment.
- FIG. 2 is an enlarged sectional view taken along the line II-II of FIG. 1.
- FIG. 3 is a longitudinal sectional front view showing a second embodiment.
- FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG. 3.
- FIG. 1 and FIG. 2 show a first embodiment.
- FIGS. 1 and 2 show a case where the present invention is applied to a two-flow internal combustion engine of the flow type.
- reference numeral 1 denotes a cylinder block provided with a cylinder 2
- reference numeral 3 denotes a cylinder head fastened to the upper surface of the cylinder block 1 so as to cover the top of the cylinder 2.
- a piston 6 which reciprocates interlockingly with a crankshaft 4 at a lower portion thereof via a connecting rod 5 is provided.
- the cylinder block 1 is provided with a plurality of scavenging ports 7 for introducing the compressed intake air into the cylinder 2, and the opening of each scavenging port 7 into the cylinder 2 is When the piston 6 descends to the vicinity of its bottom dead center, the piston 6 is opened.
- the cylinder head 3 is provided with an exhaust port 9 provided with an exhaust valve 8 that opens when the piston 6 approaches the bottom dead center.
- At least one upper piston ring 10 that is in close contact with the inner wall surface of the cylinder 2 is provided at the top end portion of the outer peripheral surface of the piston 6, and the same is provided at the end portion thereof.
- At least one lower piston ring 11 that is in close contact with the inner wall surface of the cylinder 2 is provided.
- the lower piston ring 11 of the piston 6 is located below the scavenging ports 7 when the piston 6 moves up to the top dead center, so that the scavenging ports 7
- the lower piston ring 11 is configured to prevent communication with the crank chamber below the cylinder 2.
- the inner piston surface of the cylinder 2 includes the piston.
- the piston 6 Do not correspond to the area portions 6c and 6d (thrust portion and anti-thrust portion) on both the left and right sides of the outer peripheral surface with respect to the axis of the piston pin 12! ⁇ Install in the area.
- each of the scavenging ports 7 into the cylinder 2 is directed tangentially so that the scavenging flow from each of the scavenging ports 7 turns into the cylinder 2 and turns.
- the outer peripheral surface of the piston 6 a region between the upper piston ring 10 and the lower piston ring 11 and both left and right sides in the axial direction of the piston pin 12.
- Parts 6a and 6b are partially recessed. That is, between the recessed portion and the inner wall surface of the cylinder 2, the outer peripheral surface of the piston 6 has left and right region portions 6 c and 6 d on both sides of the axis of the piston pin 12 and the inner wall surface of the cylinder 2.
- An oil reservoir space 13 in which lubricating oil is pushed out between the two.
- the opening of each of the scavenging ports 7 faces the oil reservoir space 13.
- the oil reservoir space is set so as to face each opening of the scavenging port even when the piston is at the top dead center.
- regions 6c and 6d are formed on the inner wall surface of the cylinder 2
- the piston 2 has a large thrust with respect to the inner wall surface of the cylinder 2 where the scavenging port 7 is open. Pressing by force can be reliably avoided.
- the outer peripheral surface of the piston 6 has regions 6 c and 6 d (thrust portion and anti-thrust portion) on both left and right sides of the axis of the piston pin 12, which are strong against the inner wall surface of the cylinder 2.
- regions 6 c and 6 d thrust portion and anti-thrust portion
- the outer peripheral surface of the piston 6 has regions 6 c and 6 d (thrust portion and anti-thrust portion) on both left and right sides of the axis of the piston pin 12, which are strong against the inner wall surface of the cylinder 2.
- FIG. 3 shows a second embodiment
- the oil reservoir space 13 is communicated between two longitudinal grooves 13a, 13b extending in the axial direction of the piston 6 and upper ends of the two longitudinal grooves 13a, 13b.
- the oil reservoir space is formed by depressing a part of the outer peripheral surface of the piston or by providing a groove in a part of the outer peripheral surface of the piston.
- the present invention is not limited to this, and it goes without saying that an oil reservoir space may be formed between the outer peripheral surface of the piston and the inner wall surface of the cylinder by other means.
- the size of the region portions 6a and 6b on both the left and right sides of the outer peripheral surface of the piston 6 in the axial direction of the piston pin 12 is determined by the size of the region portion 6a when viewed from the direction of the axis 2a of the cylinder 2.
- 6b and the axis 2a of the cylinder 2 are preferably set such that the central angle ⁇ 1 of the sector formed is 120-150 degrees.
- the size of the region portions 6c and 6d on both the left and right sides of the outer peripheral surface of the piston 6 with the piston pin 12 interposed therebetween is determined by observing the directional force of the axis 2a of the cylinder 2 and the region portions 6c and 6d. It is preferable to set the central angle ⁇ 2 of the sector formed by connecting the axis 2a of the cylinder 2 to 60 to 30 degrees.
- the present invention is not limited to the above-described two-flow type two-stroke internal combustion engine, but abolishes the exhaust port with the exhaust valve at the top of the cylinder, so that the scavenging port and the exhaust port face the cylinder.
- the present invention can be similarly applied to a loop or cross-flow type two-stroke internal combustion engine provided in the above.
Landscapes
- 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)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04792479A EP1707786A1 (en) | 2003-12-16 | 2004-10-15 | Two-cycle internal combustion engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003417619A JP2005180191A (ja) | 2003-12-16 | 2003-12-16 | 二サイクル内燃機関 |
JP2003-417619 | 2003-12-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005059345A1 true WO2005059345A1 (ja) | 2005-06-30 |
Family
ID=34697070
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/015262 WO2005059345A1 (ja) | 2003-12-16 | 2004-10-15 | 二サイクル内燃機関 |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1707786A1 (ja) |
JP (1) | JP2005180191A (ja) |
WO (1) | WO2005059345A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
MY165334A (en) * | 2007-11-08 | 2018-03-21 | Two Heads Llc | Monoblock valveless opposing piston internal combustion engine |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS586940U (ja) * | 1981-07-06 | 1983-01-17 | スズキ株式会社 | 内燃機関用ピストン |
JPH04109252U (ja) * | 1991-03-05 | 1992-09-22 | 三菱重工業株式会社 | ピストン装置 |
-
2003
- 2003-12-16 JP JP2003417619A patent/JP2005180191A/ja active Pending
-
2004
- 2004-10-15 EP EP04792479A patent/EP1707786A1/en not_active Withdrawn
- 2004-10-15 WO PCT/JP2004/015262 patent/WO2005059345A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS586940U (ja) * | 1981-07-06 | 1983-01-17 | スズキ株式会社 | 内燃機関用ピストン |
JPH04109252U (ja) * | 1991-03-05 | 1992-09-22 | 三菱重工業株式会社 | ピストン装置 |
Also Published As
Publication number | Publication date |
---|---|
EP1707786A1 (en) | 2006-10-04 |
JP2005180191A (ja) | 2005-07-07 |
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