WO2005028820A1 - A device for a valve control for a combustion engine - Google Patents

A device for a valve control for a combustion engine Download PDF

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Publication number
WO2005028820A1
WO2005028820A1 PCT/NO2004/000279 NO2004000279W WO2005028820A1 WO 2005028820 A1 WO2005028820 A1 WO 2005028820A1 NO 2004000279 W NO2004000279 W NO 2004000279W WO 2005028820 A1 WO2005028820 A1 WO 2005028820A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
bore
valve
piston rod
engine
Prior art date
Application number
PCT/NO2004/000279
Other languages
French (fr)
Inventor
Øystein V. REINSHORN
Original Assignee
Reinshorn Oeystein V
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Reinshorn Oeystein V filed Critical Reinshorn Oeystein V
Priority to EP04775063A priority Critical patent/EP1668229A1/en
Publication of WO2005028820A1 publication Critical patent/WO2005028820A1/en

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

  • 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.
  • 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.
  • 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 .
  • 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 .
  • the piston, piston rod and slide together are arranged to perform a reciprocating movement along the axial centre axis of the piston.
  • 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.
  • 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.
  • 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
  • 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.
  • 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.
  • 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.
  • 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.
  • An exhaust valve 40 is arranged to open to the outflow of combustion gases.
  • 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.

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

C L A I M S
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) .
PCT/NO2004/000279 2003-09-22 2004-09-21 A device for a valve control for a combustion engine WO2005028820A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04775063A EP1668229A1 (en) 2003-09-22 2004-09-21 A device for a valve control for a combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20034203 2003-09-22
NO20034203A NO319652B1 (en) 2003-09-22 2003-09-22 Device at the valve control of an internal combustion engine

Publications (1)

Publication Number Publication Date
WO2005028820A1 true WO2005028820A1 (en) 2005-03-31

Family

ID=29417534

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2004/000279 WO2005028820A1 (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)

Cited By (3)

* Cited by examiner, † Cited by third party
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
CN107355308A (en) * 2017-06-02 2017-11-17 中国北方发动机研究所(天津) A kind of piston structure of built-in valve

Citations (2)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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
CN107355308A (en) * 2017-06-02 2017-11-17 中国北方发动机研究所(天津) A kind of piston structure of built-in valve

Also Published As

Publication number Publication date
NO20034203D0 (en) 2003-09-22
NO20034203L (en) 2005-03-23
NO319652B1 (en) 2005-09-05
EP1668229A1 (en) 2006-06-14

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