FI130504B - Valve-piston system of an internal combustion engine and internal combustion engine - Google Patents
Valve-piston system of an internal combustion engine and internal combustion engine Download PDFInfo
- Publication number
- FI130504B FI130504B FI20185984A FI20185984A FI130504B FI 130504 B FI130504 B FI 130504B FI 20185984 A FI20185984 A FI 20185984A FI 20185984 A FI20185984 A FI 20185984A FI 130504 B FI130504 B FI 130504B
- Authority
- FI
- Finland
- Prior art keywords
- valve
- piston
- gas exchange
- angle
- facing
- Prior art date
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 48
- 239000000446 fuel Substances 0.000 description 14
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- -1 for example diesel Substances 0.000 description 3
- 239000010763 heavy fuel oil Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 1
Classifications
-
- 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
- F02F3/28—Other pistons with specially-shaped head
-
- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0696—W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
-
- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
A valve-piston system (20) of a cylinder of an internal combustion engine, with a piston (26) that is moveably guided up and down, with at least one inlet-side gas exchange valve (21) and at least one exhaust-side gas exchange valve (22), wherein the piston (26) on an end facing the gas exchange valves (21, 22) has a central piston trough (27) and lateral valve pockets (28) facing the gas exchange valves (21, 22), which merge into the central piston trough (27), and wherein the respective valve pocket (28) is formed disc section-like or funnel section-like in such a manner that a face (29) of the same facing the respective gas exchange valve (21, 22) is inclined relative to a perpendicular (30) to the axial direction of the piston (26) of a perpendicular (30) to the axial direction (25) of a valve body (24) of the respective gas exchange valve (21, 22).
Description
Valve-piston system of an internal combustion engine and internal combustion engine
The invention relates to a valve-piston system of an internal combustion engine and to an internal combustion engine.
Typically, internal combustion engines typically have multiple cylinders. Each cylinder of an internal combustion engine has a piston which is moveably guided up and down in a cylinder liner of the respective cylinder. In addition to this, each cylinder of an internal combustion engine has at least one inlet-side gas exchange valve for at least charge alr and at least one exhaust-side gas exchange valve for exhaust gas. In particular when the internal combustion engine is embodied as gas engine, it is not only charge air that is fed to the respective cylinder for combustion but also gaseous fuel in the form of a gas-air mixture. In particular when the internal combustion engine is embodied as diesel internal combustion engine, each cylinder has at least one injector, via which the fuel can be fed to the cylinder.
From practice it is known that a piston of a cylinder of an internal combustion engine has a central piston trough on a face facing the gas exchange valves or on an end facing the
S gas exchange valves. It is known, furthermore, that on this
N end of the piston valve pockets facing the gas exchange
S valves are formed, wherein via such valve pockets a > collision between the piston and valve bodies of the gas z exchange valves during the operation of the internal 3 combustion engine can be avoided. = 00 Starting out from this, the present invention is based on
N the object of creating a new type of valve-piston system of an internal combustion engine and an internal combustion engine with such a valve-piston system.
This object is solved through a valve-piston system of an internal combustion engine according to Claim 1. According to the invention, the respective valve pocket is formed disc section-like or funnel section-like in such a manner that a face facing the respective gas exchange valve of the same is inclined relative to a perpendicular to the axial direction of the piston or a perpendicular to the axial direction of a valve body of the respective gas exchange valve. Because of the fact that with the valve-piston system according to the invention the valve pockets are formed disc section-like or funnel section-like, the formation of so-called hotspots in the transition region between the valve pockets and the piston trough is avoided.
Furthermore, fewer swirls are created during the combustion so that the combustion of the fuel can take place altogether more effectively and accordingly with higher efficiency.
Preferentially, the face of the respective valve pocket facing the respective gas exchange valve is inclined in the direction of the piston trough. This is particularly preferred for reducing or avoiding hotspots and for reducing swirls. & According to a further development, a valve body of the
N respective gas exchange valve is formed cone section-like
S or truncated cone section-like in such a manner that a face > facing the respective valve pocket of the same is inclined z relative to the perpendicular to the axial direction of the 3 valve body. Preferentially, the face of the respective 3 valve body facing the respective valve pocket is inclined 00 away from the piston trough. This is also preferred for
N avoiding hotspots and for reducing swirls. Furthermore, a safety distance between the valve bodies of the gas exchange valves and the piston with minimal installation space is maintained.
According to a further development of the invention, the face of the respective valve pocket facing the respective gas exchange valve is inclined with a first angle, wherein the face of the respective valve body facing the respective valve pocket is inclined with a second angle.
Preferentially, the first angle and the second angle are egual in size, so that the inclined faces run parallel to one another. Alternatively, the second angle is larger than the first angle. This configuration of the invention is preferred for reducing or avoiding hotspots and for reducing swirls in the combustion chamber of the cylinder while maintaining a safety distance between the valve bodies of the gas exchange valves and the piston with minimal installation space.
The internal combustion engine according to the invention is defined in Claim 9.
Preferred further developments of the invention are obtained from the subclaims and the following description.
Exemplary embodiments of the invention are explained in more detail by way of the drawing without being restricted to this. There it shows:
S
N Fig. 1 a plan view of a cylinder of an internal
S combustion engine; > = Fig. 2 an extract of a valve-piston system of an a < internal combustion engine known from practice; = 00 Fig. 3 an extract of a valve-piston system of an
N internal combustion engine according to the invention.
The invention relates to a valve-piston system of an internal combustion engine and to an internal combustion engine.
Fig. 1 shows a highly schematic plan view of a cylinder of an internal combustion engine. In the shown exemplary embodiment, the cylinder 10 of Fig. 1 has multiple inlet- side gas exchange valves 11 and multiple exhaust-side gas exchange valves 12. Accordingly, two inlet-side gas exchange valves 11 are shown in Fig. 1, via which at least charge air can be introduced into a combustion chamber of the cylinder 10. In Fig. 1, fuel is introduced into the combustion chamber of the respective cylinder via an injector 13, via which liguid fuel, such as for example diesel, heavy fuel oil or residual oil can be injected into the combustion chamber of the respective cylinder. Exhaust gas generated during the combustion of the fuel can be discharged from the combustion chamber via the exhaust-side gas exchange valves 12.
It is pointed out here that the invention is not restricted to the use with internal combustion engines in which a liguid fuel such as diesel, heavy fuel oil or residual oil is combusted. On the contrary, the invention can also be employed with gas engines, in which a gaseous fuel is combusted, wherein with such gas engines a mixture of
S charge air and gaseous fuel is introduced into the
N combustion chamber of the cylinder via the inlet-side gas
S exchange valves 11. Furthermore, the invention can be > utilised with dual-fuel engines. = 3 Fig. 2 shows a cross section by way of an extract through a x cylinder 10 of an internal combustion engine, wherein the 3 details shown in Fig. 2 correspond to the practice or the
N prior art. Accordingly of the shown gas exchange valve 11 or 12, Fig. 2 shows a valve body 14 which can be moved up and down during the operation in the direction of its axial direction 15, in order to open or close the respective gas exchange valve 11 or 12. Furthermore, Fig. 2 shows a valve piston 16, which is moveably guided up and down in a liner of the cylinder which is not shown, namely in the direction of an axial direction of the piston 10, which typically extends parallel to the axial direction 15 of the valve body 14 of the respective gas exchange valve 11, 12.
As is evident from Fig. 2, it is already Known from practice that the piston 16 on an end facing the gas exchange valves 11, 12 has a central piston trough 17. At this end of the piston 16, Fig. 2 shows, furthermore, a valve pocket 18, which faces the respective valve body 14 of the respective gas exchange valve 11 or 12, wherein via the respective valve pocket 18 during the operation a minimum distance between the piston 16 and the valve body 14 of the respective gas exchange valve 11, 12 is provided, in order to avoid during the operation a collision between the piston 16 of the respective cylinder and the respective valve body 14 of the respective gas exchange valve 11 or 12 of the respective cylinder 10.
Fig. 3 shows an extract of a valve-piston system 20 of a cylinder 23 of an internal combustion engine according to the invention, namely in the region of a valve body 24 of an inlet-side or exhaust-side gas exchange valve 21 or 22 & and a piston 26. During the operation, the valve body 24 is
N moveable in the direction of its axial direction 25 in
S order to open or close the respective gas exchange valve 21 > or 22. The piston 26 of the cylinder 23 is moveably guided z up and down in the direction of its axial direction (not 3 shown) in a liner of the cylinder 23 which is not shown, x wherein the axial direction of the piston 26 typically 3 extends parallel to the axial direction 25 of the
N respective valve body 24 of the respective gas exchange valve 21 or 22.
On an end facing the gas exchange valves 21, 22 the piston 26 has a piston trough 27, which is formed centrally on the end of the piston 26 facing the gas exchange valves 21, 22.
At this end facing the gas exchange valves 21, 22, the piston 26 of the respective cylinder 23 furthermore comprises valve pockets 28, which interact with the gas exchange valves 21, 22. These valve pockets 28 merge into the central piston trough 27.
In terms of the invention present here, the respective valve pocket 28 is formed disc section-like or funnel section-like, namely in such a manner that a face 29 facing the respective gas exchange valve 21, 22, namely the valve body 24 of the respective gas exchange valve 21, 22 of the respective valve pocket 28 is inclined relative to a perpendicular 30 to the axial direction of the piston 26 or to the axial direction 25 of the valve body 24 of the respective gas exchange valve 21, 22, namely in the direction of the piston trough 27 of the piston 26 with a first angle o”.
Through this configuration, the formation of so-called hotspots in particular in the region of the valve pockets 28, in particular in the region of a transition edge 31 between the respective valve pocket 28 and the piston
N trough 27 is avoided, while swirls, which negatively affect
N the combustion of the fuel in the combustion chamber of the
S cylinder 23 are additionally reduced. The valve pockets 28 > harmonically merge into the piston trough 27. = 3 The valve body 28 is formed cone section-like or truncated x cone-like on an end facing the piston 26 in such a manner 3 that a face 32 facing the respective valve pocket 28 is x inclined with a second angle B relative to a perpendicular 33 to the axial direction 25 of the respective valve body
24, namely in such a manner that the face 32 of the respective valve body 24 facing the respective valve pocket 28 is inclined away from the piston 26 or from the piston trough 27 or from the respective valve pocket 28.
As explained, the face 29 of the respective valve pocket 28 facing the receptive gas exchange valve or the respective valve body 24 of the respective gas exchange valve 21, 22 is inclined with the first angle a, wherein the face 32 of the respective valve body 24 of the respective gas exchange valve 21, 22 facing the respective valve pocket 28 is inclined with the second angle B. Preferentially, the first angle o and the second angle B are identical in size so that the inclined faces 29, 32 extend parallel to one another.
Alternatively it is also possible that the first angle « and the second angle B are different in size, so that the inclined faces 29, 32 do not then extend parallel to one another, in particular the first angle « in this case is smaller than the second angle B or the second angle B is larger than the first angle o, wherein virtual extensions of the inclined faces 29, 32 then intersect in the region of the piston 26, in particular in the region of the piston trough 27.
The two angles a, B amount to a maximum of 45°, preferably
N to a maximum of 40”, particularly preferably to a maximum
N of 35°. 3 > With the invention, the formation of undesirable hotspots z or regions with excessive temperatures, in particular in 3 the transition region between the valve pockets 28 and the x piston trough 27 can be avoided. Furthermore, swirls of a 3 fuel to be combusted in the combustion chamber of the
N respective cylinder are reduced and the combustion can take place with greater efficiency because of this. A collision between the valve bodies 24 of the gas exchange valves 21, 22 and the valve piston 26 is avoided.
The invention can be employed both with diesel internal combustion engines and also with spark-ignition internal combustion engines namely with both two-stroke and also with four-stroke internal combustion engines. Here, both a liquid fuel such as for example diesel, heavy fuel oil or residual oil, or a gaseous fuel, such as for example natura] gas can be combusted in the cylinders of the respective internal combustion engine.
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I jami a <t 0
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List of reference numbers
Cylinder 11 Inlet-side gas exchange valve 12 Exhaust-side gas exchange valve 13 Injector 14 Valve body
Axial direction 16 Piston 17 Piston trough 18 Valve pocket
Valve-piston system 21 Inlet-side gas exchange valve 22 Exhaust-side gas exchange valve 23 Cylinder 24 Valve body
Axial direction 26 Piston 27 Piston trough 28 Valve pocket 29 Face
Perpendicular 31 Edge 32 Face 33 Perpendicular
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I jami a <t 0
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Claims (9)
1. A valve-piston system (20) of a cylinder of an internal combustion engine, with a piston (26) that is moveably guided up and down, with at least one inlet-side gas exchange valve (21) and at least one exhaust-side gas exchange valve (22), wherein the piston (26) at an end facing the gas exchange valves (21, 22) comprises a central piston trough (27) and lateral valve pockets (28) facing the gas exchange valves (21, 22), which merge into the central piston trough (27), wherein the respective valve pocket (28) is formed disc section-like or funnel section-like in such a manner that a face (29) of the same facing the respective gas exchange valve (21, 22) is inclined relative to a perpendicular (30) to the axial direction of the piston (26) or a perpendicular (30) to the axial direction (25) of a valve body (24) of the respective gas exchange valve (21, 22)
O . . N characterized in that N o O a valve body (24) of the respective valve exchange > valve (21, 22) is formed cone section-like or z truncated cone section-like in such a manner that a a < face (32) of the same facing the respective valve x pocket (28) is inclined relative to a perpendicular LO 00 (33) to the axial direction (25) of the valve body oO N (24).
2. The valve-piston system according to Claim 1, characterized in that the face (29) of the respective valve pocket (28) facing the respective gas exchange valve (21, 22) is inclined in the direction of the piston trough (27).
3. The valve-piston system according to Claim 1, characterized in that the face (32) of the respective valve body (24) facing the respective valve pocket (28) is inclined away from the piston trough (27).
4. The valve-piston system according to Claim 1 or 3, characterized in that the face (29) of the respective valve pocket (28) facing the respective gas exchange valve (21, 22) is inclined with a first angle (a) and in that the face (32) of the respective valve body (24) facing the respective valve pocket (28) is inclined with a second angle (RB).
5. The valve-piston system according to Claim 4, characterized in that the first angle (x) and the second angle (B) are equal in size, so that the inclined faces (29, 32) extend parallel to one another.
6. The valve-piston system according to Claim 4, characterized in that the first angle (x) and the S second angle (B) are different in size, so that the N inclined faces (29, 32) do not extend parallel to one S another. > z
7. The valve-piston system according to Claim 6, 3 characterized in that the second angle (B) is larger 3 than the first angle (a). D &
8. The valve-piston system according to Claim 6, characterized in that the first angle (x) and the second angle (B) amount to a maximum of 45°.
9. An internal combustion engine with at least one cylinder, wherein the cylinder or each cylinder comprises a valve-piston system according to any one of the Claims 1 to 8. O N O N o <Q o I jami a <t 0 O LO 00 Oo N
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017221527.5A DE102017221527A1 (en) | 2017-11-30 | 2017-11-30 | Valve Piston System of an internal combustion engine and internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FI20185984A1 FI20185984A1 (en) | 2019-05-31 |
| FI130504B true FI130504B (en) | 2023-10-11 |
Family
ID=66547771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FI20185984A FI130504B (en) | 2017-11-30 | 2018-11-22 | Valve-piston system of an internal combustion engine and internal combustion engine |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP7248413B2 (en) |
| KR (1) | KR102512199B1 (en) |
| CN (1) | CN109973239B (en) |
| DE (1) | DE102017221527A1 (en) |
| FI (1) | FI130504B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11371466B2 (en) | 2019-12-17 | 2022-06-28 | Caterpillar Inc. | Piston for internal combustion engine having valve pocket step for slowing combustion gas flow |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56127329U (en) * | 1980-02-26 | 1981-09-28 | ||
| JPH0426656Y2 (en) * | 1985-07-23 | 1992-06-26 | ||
| JP2000320335A (en) * | 1999-05-12 | 2000-11-21 | Toyota Motor Corp | Cylinder injection-type internal combustion engine |
| JP4552895B2 (en) * | 2006-05-17 | 2010-09-29 | トヨタ自動車株式会社 | Internal combustion engine |
| FI124187B (en) * | 2009-12-16 | 2014-04-30 | Wärtsilä Finland Oy | Internal combustion piston arrangement |
| JP2012021429A (en) * | 2010-07-13 | 2012-02-02 | Daihatsu Motor Co Ltd | Internal combustion engine |
| DE102012103212A1 (en) * | 2012-04-13 | 2013-10-17 | Mwm Gmbh | Piston of an internal combustion engine |
| US9267421B2 (en) * | 2012-08-24 | 2016-02-23 | Mazda Motor Corporation | Combustion chamber structure for engine |
| JP6221438B2 (en) | 2013-07-11 | 2017-11-01 | 市光工業株式会社 | Vehicle lighting |
| CN103835803B (en) * | 2014-02-24 | 2016-02-24 | 大连理工大学 | Diesel engine collision shunting combustion room |
-
2017
- 2017-11-30 DE DE102017221527.5A patent/DE102017221527A1/en active Pending
-
2018
- 2018-11-19 KR KR1020180142413A patent/KR102512199B1/en active IP Right Grant
- 2018-11-22 FI FI20185984A patent/FI130504B/en active
- 2018-11-29 JP JP2018223417A patent/JP7248413B2/en active Active
- 2018-11-30 CN CN201811456640.8A patent/CN109973239B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| KR102512199B1 (en) | 2023-03-20 |
| JP2019100339A (en) | 2019-06-24 |
| JP7248413B2 (en) | 2023-03-29 |
| CN109973239B (en) | 2022-09-20 |
| KR20190064447A (en) | 2019-06-10 |
| FI20185984A1 (en) | 2019-05-31 |
| DE102017221527A1 (en) | 2019-06-06 |
| CN109973239A (en) | 2019-07-05 |
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