초록 ▼

A method of removing oil from blowby vapors in an engine having a crankcase and an intake manifold includes filtering the blowby vapor from the engine crankcase to form a vapor depleted of oil and a collected oil. The vapor depleted of oil is communicated to the engine manifold. At high engine loads

A method of removing oil from blowby vapors in an engine having a crankcase and an intake manifold includes filtering the blowby vapor from the engine crankcase to form a vapor depleted of oil and a collected oil. The vapor depleted of oil is communicated to the engine manifold. At high engine loads the collected oil is held in a chamber, and at low engine loads while the engine is still running, the collected oil is forced from the chamber back the crankcase.

대표청구항 ▼

1. An apparatus for removing oil from blowby vapors in an engine having a crank case and an intake manifold comprising a canister having a base, an inlet for blowby vapor from the engine crankcase, a filter and a discharge for blowby vapor depleted of oil,a groove in the base within the canister to

1. An apparatus for removing oil from blowby vapors in an engine having a crank case and an intake manifold comprising a canister having a base, an inlet for blowby vapor from the engine crankcase, a filter and a discharge for blowby vapor depleted of oil,a groove in the base within the canister to collect oil draining from the filter in communication with a compartment below the groove,a first valve in a wall of the compartment leading into a chamber having a movable wall that is resiliently urged to close the first valve when in a first position and allows the first valve to open when in a second position,the movable wall having a side opposite the first valve communicating with a port to connect to the pressure at the intake manifold,a second, normally-closed valve that is opened when the movable wall is in the second position and leading from the chamber to a disposal channel for oil, the disposal channel having a port for connection to a return line to the crankcase,whereby the filter directs oil from the blowby vapors to the bottom of the housing and collected oil flows to the compartment above the first valve and passes into the chamber above the movable wall when the engine is at high load and therefore low vacuum and when the engine load decreases, the intake vacuum increases, so the movable wall moves to the second position, closing the first valve and opening the second valve and forcing oil which has accumulated above the movable wall to the disposal channel to be routed back to the crankcase. 2. An apparatus as claimed in claim 1 wherein the base of the canister has a central opening into which the blowby vapors are introduced, the canister has a central perforated stem inside the canister so that the blowby vapor with oil can be directed radially outwardly within the canister, a coalescing filter in a cylindrical form radially outward of the stem and within the canister, and the discharge for the blowby vapor is at the top of the canister and radially outwardly from the coalescing filter. 3. An apparatus as claimed in claim 1 wherein the movable wall includes a plate on a diaphragm on one side of the chamber. 4. An apparatus as claimed in claim 1 wherein the movable wall is resiliently urged to the first position by a spring. 5. An apparatus as claimed in claim 1 wherein the filter is a coalescing filter. 6. An apparatus as claimed in claim 1 wherein the first and second valves are configured identically as discs with central protrusion on one disc side forming a valve stem. 7. An apparatus as claimed in claim 6 wherein the second valve is opened when the movable wall pushes the valve stem of the second valve. 8. An apparatus as claimed in claim 1 wherein the second valve is normally closed by gravity. 9. An internal combustion engine having a crankcase and an intake manifold including an apparatus for removing oil from blowby vapors in the crankcase comprising a canister having an inlet for blowby vapor from the engine crankcase, a filter and a discharge for blowby vapor depleted of oil, the canister having a base,a groove in the base within the canister to collect oil draining from the filter in communication with a compartment below the groove,a first valve in a wall of the compartment leading into a chamber having a movable wall that is resiliently urged to close the first valve when in a first position and allows the first valve to open when in a second position,the movable wall having a side opposite the first valve communicating with a port to connect to the pressure at the intake manifold,a second, normally-closed valve that is opened when the movable wall is in the second position and leading from the chamber to a disposal channel for oil, the disposal channel having a port for connection to a return line to the crankcase,whereby the filter directs oil from the blowby vapors to the bottom of the housing and collected oil flows to the compartment above the first valve and passes into the chamber above the movable wall when the engine is at high load and therefore low vacuum and when the engine load decreases, the intake vacuum increases, so the movable wall moves to the second position, closing the first valve and opening the second valve and forcing oil which has accumulated above the movable wall to the outward disposal channel to be routed back to the crankcase. 10. An apparatus for removing oil from blowby vapors comprising a canister with a central opening into which the blowby vapors are introduced,a central stem inside the canister having perforations in it so that the vapor and oil mist can be directed radially outwardly within the canister,a coalescing filter in a cylindrical form radially outward of the stem and within the canister,a discharge port for the blowby vapor at the top of the canister and offset outwardly from the coalescing filter,a groove at the bottom of the canister, leading to a channel that extends downward to a compartment in the bottom of the canister,a valve at the bottom of the compartment leading into a larger chamber defined at its bottom by a movable plate sealed around its periphery by a diaphragm,a spring at the bottom of the plate urging the plate upward with and the volume on the spring side of the plate having a port to connect to the pressure at the intake manifold, anda second valve that is normally closed by gravity on the top of the plate, positioned to open upward to an outward disposal channel for oil when the plate contacts it, the disposal channel having a port for connection to a return line to the crankcase,whereby the coalescing filter causes the fine droplets of oil to coalesce to the point where they no longer are carried in the blowby vapor stream and instead are allowed to flow by gravity downwardly to the bottom of the canister and collected oil can collect in the compartment above the first valve but trickles down into the volume above the plate when the engine is at high load and therefore low vacuum and when the engine load decreases, the intake vacuum increases, allowing the diaphragm to rise upwardly, closing the valve draining from the canister and opening the second valve to allow the oil which has accumulated above the plate to divert outwardly to the oil drain to be routed back to the crankcase. 11. A method of removing oil from blowby vapors in an engine having a crankcase and an intake manifold comprising filtering the blowby vapor from the engine crankcase to form a vapor depleted of oil and a collected oil, directing the vapor depleted of oil to the engine manifold, andat high engine loads holding the collected oil in a chamber, and at low engine loads while the engine is still running, forcing the collected oil from the chamber back the crankcase. 12. A method as claimed in claim 11 wherein holding the collected oil in a chamber includes allowing the collected oil to flow past an open first valve to the chamber and to be held against further flow by a closed second valve. 13. A method as claimed in claim 12 wherein the first valve is allowed to stay open by a plate on the chamber side of the first valve when the engine is at high load and therefore low vacuum. 14. A method as claimed in claim 12 wherein forcing the collected oil from the chamber back the crankcase includes closing the first valve and opening the second valve to open a drain line to the crankcase. 15. A method as claimed in claim 14 wherein forcing the collected oil includes compressing the chamber to force the oil past the second valve. 16. A method as claimed in claim 11 wherein filtering includes passing the blowby vapor radially outward through an annular filter. 17. A method as claimed in claim 11 wherein filtering includes passing the blowby vapor radially outward through an annular coalescing filter. 18. A method as claimed in claim 11 wherein filtering the blowby vapor from the engine crankcase to form a vapor depleted of oil and collected oil includes allowing the collected oil to flow to the chamber under the influence of gravity. 19. A method of removing oil from blowby vapors in an engine having a crankcase and an intake manifold comprising filtering the blowby vapor from the engine crankcase to form a vapor depleted of oil and a collected oil, directing the vapor depleted of oil to the engine manifold, wherein filtering includes passing the blowby vapor radially outward through an annular coalescing filter and allowing the collected oil to flow under the influence of gravity to a chamber,at high engine loads, holding the collected oil in the chamber including allowing the collected oil to flow past an open first valve to the chamber and be held against further flow by a closed second valve, wherein the first valve is allowed to stay open by a plate on the chamber side of the first valve when the engine is at high load and therefore low vacuum, andat low engine loads while the engine is still running, forcing the collected oil from the chamber back toward the crankcase by closing the first valve and opening the second valve to open drain line to the crankcase and compressing the chamber to force the oil past the second valve.