EP1668229A1 - A device for a valve control for a combustion engine - Google Patents
A device for a valve control for a combustion engineInfo
- Publication number
- EP1668229A1 EP1668229A1 EP04775063A EP04775063A EP1668229A1 EP 1668229 A1 EP1668229 A1 EP 1668229A1 EP 04775063 A EP04775063 A EP 04775063A EP 04775063 A EP04775063 A EP 04775063A EP 1668229 A1 EP1668229 A1 EP 1668229A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- bore
- valve
- piston rod
- engine
- 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- Withdrawn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
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L11/00—Valve arrangements in working piston or piston-rod
- F01L11/02—Valve arrangements in working piston or piston-rod in piston
-
- 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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/36—Valve-gear or valve arrangements, e.g. lift-valve gear peculiar to machines or engines of specific type other than four-stroke cycle
- F01L1/38—Valve-gear or valve arrangements, e.g. lift-valve gear peculiar to machines or engines of specific type other than four-stroke cycle for engines with other than four-stroke cycle, e.g. with two-stroke cycle
Definitions
- the piston, piston rod and slide together are arranged to perform a reciprocating movement along the axial centre axis of the piston.
- the piston valve is movable between an open position and a closed position relative to the piston.
- An axial bore extending through the piston rod forms a communication opening between the piston valve and an actuator at the opposite portion of the piston rod relative to the piston valve.
- the connection between the piston valve and actuator can be mechanical, for example.
- the piston valve is provided with a guide portion extending into the through bore of the piston rod.
- Figure 3 shows the same as Figure 2 , but here the active part of the actuator is in its lower inactive position
- Figure 4 shows the same as Figure 3, but here the piston is shown as it is on its way up in its compression stroke, while at the same time the piston valve is about to close.
- a piston rod 13 is fixedly connected to the piston 4 and extends in a known way through a stuffing box 14 arranged in the lower end portion of the cylinder 2.
- an intermediate rod 20 is articulated with the slide 16 by means of a pin bolt 22, the pin bolt 22 also extending through a corresponding bearing bore 25 in the piston rod 13.
- the piston valve 10 is restrictedly movable relative to the piston 4, as the piston valve is provided with a guide portion 26 projecting into the bore 24 and being movable between two corresponding shoulders 28 in the bore 24.
- the inward- facing part 30 of the guide portion 26 forms an essentially sealing piston in the bore 24.
- the piston rod 13 is provided with a plunger 32 movable in the bore 24. The plunger 32 is prevented from being moved out of the bore 24 by means of a shoulder 34 in the bore 24.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
A device for a combustion engine (1) comprising a cylinder (2), a piston (4) with a piston valve (10), a piston rod (13) and a slide (16), the piston rod (13) being provided with an axial through bore (24).
Description
A DEVICE FOR A VALVE CONTROL FOR A COMBUSTION ENGINE
This invention relates to a valve control for a combustion engine. More particularly, it concerns the control of an inlet valve arranged in the piston of a two-stroke engine.
It is known to build an inlet valve into the piston of a combustion engine. Where a two-stroke engine is involved, which is provided with a piston and a valve of this kind, it is convenient to feed the engine with flush air through a check valve in the bottom portion of the engine cylinder.
Through spring loading, the piston valve can open and close to flow from the underside of the piston in that it is influenced by the differential pressure across the piston.
US patent 5603291 discloses a combustion engine, in which the piston is provided with an exhaust valve. The exhaust valve is controlled via a push rod by an eccentric surface of the crankshaft. The design is not suitable for a two-stroke engine provided with a flush air chamber in the cylinder below the piston.
The invention has as its object to remedy the drawbacks of the prior art.
The object is realized in accordance with the invention through the features specified in the description below and in the following Claims.
A piston with a preferably fixedly connected piston rod is movably arranged in a combustion engine cylinder. The piston rod extends through a sealing in the lower portion of the cylinder. The cylinder volume located below the piston is supplied with flush air, preferably through a check valve in the lower portion of the cylinder. The combustion engine cylinder is provided with the necessary devices according to techniques known per se for cooling and for the supply of fuel and also an outlet for waste gases .
At its opposite lower end portion, the piston rod is connected to a slide. The slide, running in a guide, is movable in the direction of movement of the piston rod, and the slide is arranged to absorb forces acting on the slide in other directions .
Thus, in operation, the piston, piston rod and slide together are arranged to perform a reciprocating movement along the axial centre axis of the piston.
At one of its end portions an intermediate rod is articulated with the slide by means of an articulated axle.
The piston valve is movable between an open position and a closed position relative to the piston. An axial bore extending through the piston rod forms a communication opening between the piston valve and an actuator at the opposite portion of the piston rod relative to the piston valve.
The connection between the piston valve and actuator can be mechanical, for example. In a preferred embodiment the piston valve is provided with a guide portion extending into the through bore of the piston rod.
A plunger is arranged in the through bore of the piston rod, at the opposite lower end portion of the piston rod. The volume of the through bore is filled with fluid, typically with oil, which can advantageously be supplied from the pressure lubrication system of the engine through the intermediate rod.
The actuator affecting the piston valve via the through bore of the piston rod is arranged to control the relative position of the piston rod valve relative to the piston at least over part of the length of stroke of the piston.
In what follows there is described a non-limiting example of a preferred embodiment which is visualized in accompanying drawings, in which:
Figure 1 shows schematically an engine according to the invention, in which the piston is on its way down in the work- ing stroke of the engine. The active part of an actuator is in its active position moved towards the piston rod;
Figure 2 shows the engine of Figure 1, but here the piston is in its lower position, the plunger of the lower portion of the piston rod being prevented by the actuator from moving to its lower position;
Figure 3 shows the same as Figure 2 , but here the active part of the actuator is in its lower inactive position, and
Figure 4 shows the same as Figure 3, but here the piston is shown as it is on its way up in its compression stroke, while at the same time the piston valve is about to close.
In the drawings the reference numeral 1 denotes a combustion engine, in the following referred to as the engine, comprising a cylinder 2 provided with a piston 4. The engine 1 is a two-stroke engine, in which, in a known manner, the combustion air is compressed in a flush air volume 6 below the piston 4 before flowing into the combustion space 8 of the cyl- inder 2 through a piston valve 10 which opens/closes a through opening 12 in the piston 4.
A piston rod 13 is fixedly connected to the piston 4 and extends in a known way through a stuffing box 14 arranged in the lower end portion of the cylinder 2.
The piston rod 13 is connected at its opposite lower end portion to a slide 16. The slide 16, running in a guide 18, is movable in the direction of movement of the piston rod 13 and is arranged to absorb forces acting on the slide 16 in other directions.
At one of its end portions, an intermediate rod 20 is articulated with the slide 16 by means of a pin bolt 22, the pin bolt 22 also extending through a corresponding bearing bore 25 in the piston rod 13.
The piston rod 13 is provided with a centred through bore 24.
The piston valve 10 is restrictedly movable relative to the piston 4, as the piston valve is provided with a guide portion 26 projecting into the bore 24 and being movable between two corresponding shoulders 28 in the bore 24. The inward- facing part 30 of the guide portion 26 forms an essentially sealing piston in the bore 24. At its opposite lower end por-
tion the piston rod 13 is provided with a plunger 32 movable in the bore 24. The plunger 32 is prevented from being moved out of the bore 24 by means of a shoulder 34 in the bore 24.
The plunger 32 forms an essentially sealing piston in the bore 24. The plunger 32 projects somewhat from the lower end portion of the piston rod 13 and is arranged to come to contact on the anchor/active part 38 of an electromagnet/actuator 36 when the piston rod is close to its lower position and the anchor 38 of the electromagnet 36 is in its active posi- tion.
The bore 24 of the piston rod 13 is supplied with pressurized fluid from the lubrication oil system of the engine 1 through the intermediate rod 20 and the pin bolt 22.
When the piston 4 is moved downwards in its working stroke, see Figure 1, the gas pressure within the combustion space 8 is greater than the gas pressure in the flush air volume 6. Thereby, the piston valve is kept closed during the working stroke of the piston. Just before the piston reaches its lower position, see Figure 2, the plunger 32 comes to contact on the anchor 38. During the further downward movement of the piston 4 the piston valve 10 is prevented from moving further down and thereby opens to gas flow through the bore 12 of the piston 4. The piston valve 10 opens by an increased fluid pressure arising in the bore 24 due to the relative movement of the plunger 32 inwards in the bore 24. The increased fluid pressure acting on the guide portion 26, makes the piston valve 10 move towards its open position.
An exhaust valve 40 is arranged to open to the outflow of combustion gases.
When the piston 4 is in a given position relative to the cylinder 2, the anchor 38 of the electromagnet 36 is moved to
its idle position by means of a control technique known in itself, see Figure 3.
Thereby, the piston valve 10 is released and can close flow through the opening 12 in the piston 4 as soon as the piston 4 starts its movement in the compression stroke, see Figure 4.
Claims
1. A device for a combustion engine (1) comprising a cylinder (2) , a piston (4) with a piston valve (10) , a piston rod (13) and a slide (16), the piston rod (13) being provided with an axial through bore (24), char ac t e r i z ed in that the relative position of the piston valve (10) in the piston (4) is controlled, at least during part of the length of stroke of the piston (4) , by an actuator (36) through the bore (24) .
2. A device in accordance with claim 1, charac t er i z ed in that the piston valve (10) is provided with a piston-like guide portion (26, 30) arranged to communicate hydraulically with a plunger (32) through the bore (24) .
3. A device in accordance with claim 3, charac ter i z ed in that, at least during part of the length of stroke of the piston (4), the plunger (32) is arranged to come to contact on the active part (38) of an actuator (36) .
4. A device in accordance with claim 1, charac t e r i z ed in that the bore (24) is supplied with pressurized fluid from the lubrication system of the engine (1) .
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20034203A NO319652B1 (en) | 2003-09-22 | 2003-09-22 | Device at the valve control of an internal combustion engine |
| PCT/NO2004/000279 WO2005028820A1 (en) | 2003-09-22 | 2004-09-21 | A device for a valve control for a combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1668229A1 true EP1668229A1 (en) | 2006-06-14 |
Family
ID=29417534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04775063A Withdrawn EP1668229A1 (en) | 2003-09-22 | 2004-09-21 | A device for a valve control for a combustion engine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1668229A1 (en) |
| NO (1) | NO319652B1 (en) |
| WO (1) | WO2005028820A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2937380A1 (en) * | 2008-10-21 | 2010-04-23 | Michel Marchisseau | Valve i.e. intake valve, opening method for internal combustion engine, involves applying field of forces between pusher piece and reception zone for opening intake valve and limiting intensity of field of force |
| WO2014144581A1 (en) * | 2013-03-15 | 2014-09-18 | Mcalister Technologies, Llc | Internal combustion engine and associated systems and methods |
| CN107355308B (en) * | 2017-06-02 | 2019-03-22 | 中国北方发动机研究所(天津) | A kind of piston structure of built-in valve |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR432114A (en) * | 1910-09-27 | 1911-11-29 | Societe Des Camions Et Autobus A Moteur Rotatif | Control system for intake valves housed in the pistons of four-stroke rotary engines with rigid connecting rods |
| US2215793A (en) * | 1938-11-29 | 1940-09-24 | Mayes Graham | Internal combustion engine |
-
2003
- 2003-09-22 NO NO20034203A patent/NO319652B1/en unknown
-
2004
- 2004-09-21 EP EP04775063A patent/EP1668229A1/en not_active Withdrawn
- 2004-09-21 WO PCT/NO2004/000279 patent/WO2005028820A1/en active Application Filing
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2005028820A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| NO20034203L (en) | 2005-03-23 |
| WO2005028820A1 (en) | 2005-03-31 |
| NO319652B1 (en) | 2005-09-05 |
| NO20034203D0 (en) | 2003-09-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20060424 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR |
|
| DAX | Request for extension of the european patent (deleted) | ||
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
| 18W | Application withdrawn |
Effective date: 20081206 |