GB2227055A - Two-stroke diesel engine - Google Patents
Two-stroke diesel engine Download PDFInfo
- Publication number
- GB2227055A GB2227055A GB8900759A GB8900759A GB2227055A GB 2227055 A GB2227055 A GB 2227055A GB 8900759 A GB8900759 A GB 8900759A GB 8900759 A GB8900759 A GB 8900759A GB 2227055 A GB2227055 A GB 2227055A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cylinder
- exhaust valve
- diesel engine
- guide hole
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M57/00—Fuel-injectors combined or associated with other devices
- F02M57/04—Fuel-injectors combined or associated with other devices the devices being combustion-air intake or exhaust valves
-
- 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
- F01L3/24—Safety means or accessories, not provided for in preceding sub- groups 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
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
- F02B25/02—Engines characterised by using fresh charge for scavenging cylinders using unidirectional scavenging
- F02B25/04—Engines having ports both in cylinder head and in cylinder wall near bottom of piston stroke
-
- 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
-
- 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
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The cylinder head exhaust valve 14, 16 has the fuel supply tube 28 centrally located therein. The cylinder 2 has air inlets 8 and the piston 6 a concave upper surface 30. <IMAGE>
Description
Title of the Invention
Diesel Engine Cylinder Mechanism
Background of the Invention
Field of the Invention
This invention relates to a diesel engine cylinder ae- chaise and, nore particularly, to a diesel engine cylinder mechanism, which permits reduction of the cylinder size and prolongation of the cylinder life.
Prior Art
In a cylinder of a prior art automotive two-cycle diesel engine, for instance, with the cylinder wall provided with a plurality of air inlet holes communicating with the cylinder interior when the piston is at the bottom dead center, an exhaust valve and a fuel supply tube ith an injection valve are provided separately on the cylinder.
Also, the piston has a flat upper end surface.
The provision of the exhaust valve and fuel supply tube with injection valve separately on the cylinder as in the prior art dictates size increase of the cylinder itself. In addition, the cylinder has to be formed with two counting holes for mounting the exhaust valve and fuel supply tube with injection valve. Therefore, at least double the ian- holrs - required for manufacturing the cylinder and ensur ins the air tightness.
Further, since the piston has a flat upper end surface, the pressure of explosion at the tire of ignition by coapression is strongly directly applied to the cylinder periphery. Thus, it is liable to cause damage to the peripheral wall of the cylinder, thus reducing the cylinder life.
Sugary of the Invention
The present invention has been intended in the light of the problens described above in the prior art diesel engine cylinder mechanism. The inventor contenpiated that the above problems can be solved by providing an exhaust valve such that it extends fron the center of the upper end wall of the diesel engine cylinder into the cylinder, having the lower end of a fuel supply tube with injection valve inserted through and secured to the center of the exhaust valve and preferaly also by fo-ming a cup-shaped concave upper end surface of the piston. The invention is predicted in this contelpiation.
A Urinary object of the invention is to provide a diesel engine cylinder mechanism, which peraits reduction of the cylinder size.
A second object of the invention is to provide a diesel engine cylinder mechanism, which permits extreme reduction of the man-hours required for the nanufacture of the cylinder
and securing air tightness, thus contributing to the cost
reduction.
A third object of the invention is to provide a diesel
engine cylinder mechanism, which permits damage avoidance to the
cylinder periphery and prolongation of the cylinder life.
The above and other objects and novel features of the
present invention will become adore apparent when the
following detailed description is read with reference to
the accompanying drawing. The drawing is for the purposeo
of illustration only and not sense of limiting the
invention.
Brief Description of the Drawing
Fig. 1 is a scheiatic elevational sectional view
showing a diesel engine cylinder mechanism according to the invention Description of the Preferred Embodiment Referring to Fig. 1, reference numeral 2 designates a
diesel engine cylinder. The peripheral wall 4 of the
cylinder 2 has a plurality of air inlet holes 8 which oavunicate with the interior of the cylinder 2 when the
piston 6 is at the bottoi dead center (the piston 6 being
shown in Fig. 1 at the top dead center at the tire of
ignition by co.pression).
The upper end wall (cylinder head) 10 of the cylinder 2 has a central vertical guide hole 12. A guide pipe 16 with an exhaust valve 14 secured to the lower end vertically movably penetrates the guide hole 12. The guide pipe 16 is biased by a coil spring 20 fitted on the outer periphery of the guide pipe 16 with the upper and lower ends secured to the top of the upper end wall 10 of the cylinder 2 and upper flange 18 of the guide pipe 16. The guide pipe 16 is operable by the cauls 22 rotated by a synchronization control mechanism (not shown) such that it executes a constantfrequency vertical reciprocation to descend against the spring force of the coil spring 20 and ascending by the spring force of the coil spring 20.
With the constant period vertical reciprocation of the guide pipe 16 with the compression and elongation of the coil spring 20 caused by the cans 22, the exhaust valve 14 secured to the lower end of the guide pipe 16 continuously opens and closes at a constant frequency an opening 26 of the stei of an exhaust air passage 24 extending fros the lower portion of the guide hole 12 of the cylinder 2 toward one side of the upper end wall 10 of the cylinder 2.
A fuel supply tube 28 with an ignition valve coaxially extends through the guide pipe 16 with its lower end penetrating and secured to the center of the exhaust valvc 14.
Thus, there is no need of forcing the cylinder 2 with two mounting holes for bunting the exhaust valve 14 and fuel supply tube 28 with ignition valve, but it is necessary to forn only a single guide hole 12. The upper end face of the piston 6 has a cup-shaped concave surface 30. The pressure of explosion at the tine of ignition by coepression can be first applied to the center of the cup-shaped concave surface 30 and then progressively dispersed along the concave surface toward the edge thereof.
The operation of the other partsof the cylinder mechanism is the sane as in the prior art.
As has been shown in the foregoing, with the diesel engine cylinder according to the invention the upper end wall of the cylinder is provided with a central guide hole, through which a guide pipe with an exhaust valve is inserted. Thus, the exhaust valve and fuel supply tube with an ignition valve can be sinultaneously mounted in the sane place, thus Permitting size reduction of the cylinder and greatly reducing ean-hour for the nanufacture of the cylinder and assuring air-tightness.
Besides, with the piston provided with a cup-shaped concave upper end surface, the pressure of explosion at the tile of the ignition by conpression can be first applied to the center of the cup-shaped concave surface and dispersed along the cup-shaped concave surface toward the edge thereof.
Thus, no pressure of explosion is directly applied to the cylinder periphery, thus eliainating damage to the cylinder periphery contributing to the extension of the cylinder life.
It is obvious that various nodifications of the above construction are possible without departing fron the scope of the invent ion, and the described forn of invention is by no leans linitative except for definition by the annexed clan.
Claims (4)
1. A diesel engine cylinder mechanism with the cylinder periphery formed with a plurality of air inlet holes coinunicating with the cylinder interior when the piston is at the bottom dead center, in which said cylinder has an upper end wall with a central guide hole, a guide pipe with an exhaust valve secured to the lower end penetrates said guide hole for vertical eoverent in said cylinder, said exhaust valve opens and closes an opening of the sten of an exhaust air passage extending from the lower portion of the guide hole of the cylinder toward one side of said upper end wall, a fuel supply tube with an ignition valve penetrates said guide pipe and has a lower end inserted through and secured to the center of said exhaust valve to be exposed to the cylinder, and said piston has a cup-shaped concave upper end surface.
2. A diesel engine cylinder mechanism with the cylinder periphery formed with a plurality of air inlet holes communicating with the cylinder interior when the piston is at the bottom dead centre, in which said cylinder has an upper end wall with a central guide hole, a guide pipe with an exhaust valve secured to the lower end penetrates said guide hole for vertical movement in said cylinder, said exhaust valve opens and closes an opening of the stem of an exhaust air passage extending from the lower portion of the guide hole of the cylinder toward one side of said upper end wall, and a fuel supply tube with an ignition valve penetrates said guide pipe and has a lower end inserted through and secured to the centre of said exhaust valve to be exposed to the cylinder.
3. A mechanism according to claim 2, wherein said piston has a cup-shaped concave upper end surface.
4. A diesel engine cylinder mechanism as claimed in claim 1 or claim 2, substantially as herein described with reference to and as shown in the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8900759A GB2227055A (en) | 1989-01-13 | 1989-01-13 | Two-stroke diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8900759A GB2227055A (en) | 1989-01-13 | 1989-01-13 | Two-stroke diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8900759D0 GB8900759D0 (en) | 1989-03-08 |
| GB2227055A true GB2227055A (en) | 1990-07-18 |
Family
ID=10649993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8900759A Withdrawn GB2227055A (en) | 1989-01-13 | 1989-01-13 | Two-stroke diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2227055A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0492346A1 (en) * | 1990-12-21 | 1992-07-01 | Krupp MaK Maschinenbau GmbH | Internal combustion engine, especially Diesel engine |
| WO1999025969A1 (en) * | 1997-11-19 | 1999-05-27 | Caterpillar Inc. | Two cycle engine having a mono-valve integrated with a fuel injector |
| WO2009138085A1 (en) | 2008-05-13 | 2009-11-19 | Man Diesel, Filial Af Man Diesel Se, Tyskland | Exhaust valve for a large sized two stroke diesel engine, process for reduction of nox-formation in such an engine and such engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB639923A (en) * | 1945-03-26 | 1950-07-12 | Chandler Evans Corp | Improvements in or relating to liquid fuel supply systems for internal combustion engines |
| GB748589A (en) * | 1954-05-14 | 1956-05-02 | Ronald David Jones | Improvements relating to fuel injection internal combustion engines |
| GB784586A (en) * | 1954-02-17 | 1957-10-09 | Alfred Buechi | Two-stroke internal combustion engine with exhaust gas turbo-charging |
| GB1560832A (en) * | 1976-07-03 | 1980-02-13 | Schaich J | Internal combustion piston engines |
| GB2105787A (en) * | 1981-09-14 | 1983-03-30 | Colgate Thermodynamics Co | Positive-displacement fluid-machines |
-
1989
- 1989-01-13 GB GB8900759A patent/GB2227055A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB639923A (en) * | 1945-03-26 | 1950-07-12 | Chandler Evans Corp | Improvements in or relating to liquid fuel supply systems for internal combustion engines |
| GB784586A (en) * | 1954-02-17 | 1957-10-09 | Alfred Buechi | Two-stroke internal combustion engine with exhaust gas turbo-charging |
| GB748589A (en) * | 1954-05-14 | 1956-05-02 | Ronald David Jones | Improvements relating to fuel injection internal combustion engines |
| GB1560832A (en) * | 1976-07-03 | 1980-02-13 | Schaich J | Internal combustion piston engines |
| GB2105787A (en) * | 1981-09-14 | 1983-03-30 | Colgate Thermodynamics Co | Positive-displacement fluid-machines |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0492346A1 (en) * | 1990-12-21 | 1992-07-01 | Krupp MaK Maschinenbau GmbH | Internal combustion engine, especially Diesel engine |
| WO1999025969A1 (en) * | 1997-11-19 | 1999-05-27 | Caterpillar Inc. | Two cycle engine having a mono-valve integrated with a fuel injector |
| WO2009138085A1 (en) | 2008-05-13 | 2009-11-19 | Man Diesel, Filial Af Man Diesel Se, Tyskland | Exhaust valve for a large sized two stroke diesel engine, process for reduction of nox-formation in such an engine and such engine |
| RU2458229C1 (en) * | 2008-05-13 | 2012-08-10 | Ман Дизель Энд Турбо, Филиал Аф Ман Дизель Энд Турбо Се, Тискланд | EXHAUST VALVE FOR LARGE-SIZE TWO-STROKE DIESEL ENGINE, METHOD OF DECREASING NOx CONTENT IN SAID ENGINE AND SAID ENGINE |
| US8869511B2 (en) | 2008-05-13 | 2014-10-28 | Man Diesel & Turbo, Filial Af Man Diesel & Turbo Se, Tyskland | Exhaust valve for a large sized two stroke diesel engine, process for reduction on NOx-formation in such an engine and such engine |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8900759D0 (en) | 1989-03-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |