DK200101734A - Process for atomizing lubricating oil in a cylinder of an internal combustion engine - Google Patents

Description

PATENTKRAV 1. Fremgangsmåde til forstøvning af smøreolie i en cylinder i en forbrændingsmotor, navnlig en totakts krydshovedmotor, hvor en pumpe aktiveres periodisk til levering af en dosis af smøreolie til et smørerør, der forbinder en afgang på pumpen med en forstøverventil ved smørestedet, og hvor forstøverventilen åbner for forstøvning af smøreolien ind i cylinderen, når trykket i smørerøret overstiger et forudbestemt åbnetryk, kendetegnet ved, at forstøverventilen lukkes ved et lavere tryk end sit åbnetryk, at smøreolien leveres fra pumpen via en kontraventil til et volumen mellem kontraventilen og forstøverventilen, hvori smøreolien akkumuleres midlertidigt under fremadskridende trykstigning samtidig med leveringen af smøreolie fra pumpen til volumenet, og at den akkumulerede smøreolie udløses ved at forstøves ud gennem forstøverventilen, når smøreolietrykket i volumenet overstiger forstøverventilens åbnetryk. 2. Fremgangsmåde ifølge krav 1, kendetegnet ved, at smøreolien leveres i flere doser fra pumpen via kontraventilen til volumenet, hvori trykket stiger trinvist i takt med leveringen af smøreoliedoser til volumenet, og at smøreolien forstøves ud gennem forstøverventilen, når den sidst leverede dosis af smøreolie bringer smøreolietrykket i volumenet op over forstøverventilens åbnetryk. 3. Fremgangsmåde ifølge krav 1 eller 2, kendetegnet ved, at pumpen aktiveres proportionalt med forbrændingsmotorens omdrejningstal, såsom aktiveres et forudbestemt antal gange i løbet af et forudbestemt antal motoromdrejninger. 4. Fremgangsmåde ifølge krav 2 eller 3, kendetegnet ved, at pumpen aktiveres fra 2 til 30 gange per forstøvning af smøreolie, fortrinsvis højst 10 gange. 5. Fremgangsmåde ifølge et af kravene 1-4, kendetegnet ved, at den individuelle dosis af smøreolie fra pumpen giver en trykstigning i volumenet mellem kontraventilen og forstøverventilen på fra 1 til 10 bar, fortrinsvis 2 til 5 bar. 6. Fremgangsmåde ifølge et af kravene 1-5, kendetegnet ved, at pumpen for overvindelse af åbnetrykket skal aktiveres flere gange, når forbrændingsmotoren kører ved dellast, end når den kører ved fuldlast. 7. Fremgangsmåde ifølge et af de foregående krav, kendetegnet ved, at der ved dellast på P % af fuldlast af forbrændingsmotoren leveres en større smøreoliemængde per kWh end P % x smøreoliemængden per kWh ved fuldlast. 8. Fremgangsmåde ifølge et af de foregående krav, kendetegnet ved, at forstøverventilen åbnes ved et tryk, der er forudbestemt til at ligge i intervallet fra 15 til 40 bar over cylinder trykket på det tidspunkt i motorcyklussen, hvor forstøvningen af smøreolie ind i cylinderen foretages. 9. Fremgaangsmåde ifølge et af de foregående krav, kendetegnet ved, at forstøverventilen åbnes, når cylindertrykket er større end 40% af forbrændingsmotorens maksimale kompressionstryk. 10. Fremgangsmåde ifølge et af de foregående krav, kendetegnet ved, at smøreoliepumpens leveringsmængde per dosis er regulerbar, og at den hensigtsmæssigt forøges, når motoren kører ved dellast. 11. Fremgangsmåde ifølge et af de foregående krav, kendetegnet ved, at der gennemsnitligt per motor omdrejning ved en dellast på P % af fuldlast af forbrændingsmotoren forstøves en mindre smøreoliemængde ind i cylinderen end P x den smøreoliemængde, der gennemsnitligt per motoromdrejning forstøves ind i cylinderen ved fuldlast. 12. Fremgangsmåde ifølge et af kravene 1-10, kendetegnet ved, at der med pumpen ved en dellast på P % af fuldlast af forbrændingsmotoren leveres en større smøreoliemængde per kWh end P % x smøreoliemængden per kWh ved fuldlast. 13. Fremgangsmåde ifølge et af kravene 1-12, kendetegnet ved, at forstøverventilens åbne-tryk er indstilleligt. 14. Fremgangsmåde ifølge et af kravene 1-13, kendetegnet ved, at forstøverventilens lukketryk er indstilleligt.A method for atomizing lubricating oil in a cylinder of an internal combustion engine, in particular a two-stroke cross-head motor, wherein a pump is periodically actuated to deliver a dose of lubricating oil to a lubricant connecting a discharge of the pump to a nebulizer valve at the lubrication site. the atomizer valve opens to atomize the lubricating oil into the cylinder when the pressure in the lubricant exceeds a predetermined opening pressure, characterized in that the atomizer valve is closed at a lower pressure than its opening pressure, the lubricating oil being delivered from the pump via a check valve to a volume between the check valve and the atomizer valve, wherein the lubricating oil is temporarily accumulated during progressive pressure rise at the same time as the supply of lubricating oil from the pump to the volume, and that the accumulated lubricating oil is released by spraying out through the nebulizer valve when the lubricating oil pressure in the volume exceeds the nebulizer valve open pressure. Process according to claim 1, characterized in that the lubricating oil is delivered in several doses from the pump via the check valve to the volume, wherein the pressure rises incrementally with the delivery of lubricating oil doses to the volume and that the lubricating oil is ejected through the atomizer valve when the last delivered dose of lubricating oil brings the lubricating oil pressure in the volume above the nebulizer valve opening pressure. Method according to claim 1 or 2, characterized in that the pump is actuated proportionally to the engine speed, such as being activated a predetermined number of times during a predetermined number of engine revolutions. Method according to claim 2 or 3, characterized in that the pump is activated from 2 to 30 times per atomization of lubricating oil, preferably at most 10 times. Process according to one of claims 1-4, characterized in that the individual dose of lubricating oil from the pump gives a pressure increase in the volume between the check valve and the nebulizer valve of from 1 to 10 bar, preferably 2 to 5 bar. Method according to one of Claims 1 to 5, characterized in that the pump for overcoming the opening pressure must be activated more times when the internal combustion engine runs at partial load than when running at full load. Process according to one of the preceding claims, characterized in that at a partial load of P% of full load of the combustion engine, a greater lubricating oil quantity per kWh is delivered than P% x lubricating oil volume per kWh at full load. Method according to one of the preceding claims, characterized in that the atomizer valve is opened at a pressure predetermined to be in the range of 15 to 40 bar above the cylinder pressure at the time of the motor cycle in which the spraying of lubricating oil into the cylinder is carried out. . Method according to one of the preceding claims, characterized in that the atomizer valve is opened when the cylinder pressure is greater than 40% of the maximum compression pressure of the internal combustion engine. Method according to one of the preceding claims, characterized in that the amount of delivery of the lubricating oil pump per dose is adjustable and that it is suitably increased when the engine is running at partial load. Method according to one of the preceding claims, characterized in that, on average per engine rotation at a partial load of P% of full load of the internal combustion engine, a smaller amount of lubricating oil is injected into the cylinder than P x the average amount of lubricating oil is injected into the cylinder. at full load. Process according to one of Claims 1 to 10, characterized in that with the pump at a partial load of P% of full load of the combustion engine, a greater lubricating oil quantity per kWh is delivered than P% x lubricating oil volume per kWh at full load. Method according to one of claims 1-12, characterized in that the open pressure of the atomizer valve is adjustable. Method according to one of claims 1 to 13, characterized in that the closing pressure of the nebulizer valve is adjustable.