Oil filter having an integral metering orifice for a valve lifter oil manifold assembly
View Patent ↗A combined oil filtration and metering assembly for filtering and metering oil in an oil gallery, such as in a Lifter Oil Manifold Assembly of an internal combustion engine. The filtration and metering assembly includes a filtration element at an oil entrance leading to an internal chamber having a metering orifice as an outlet to a downstream portion of the oil gallery. Preferably the metering orifice has a diverging exit cone. Preferably, the assembly replaces directly a prior art metering valve in a LOMA socket without requiring retooling of the LOMA top plate. The assembly may be readily formed by molding of the filtration element into the oil entrance in an injection overmolding process.
1. A combined oil filtration and metering assembly for filtering and metering oil flowing through an oil gallery of an internal combustion engine, comprising:
a) a hollow body having an outer wall defining an internal chamber and having an opening;
b) a filter mesh element disposed in the opening of said body for filtering particles from oil passing through said oil gallery into said chamber; and
c) a metering orifice formed in said body for exit of filtered oil from said chamber at a predetermined flow rate into said oil gallery.
2. An assembly in accordance with claim 1 wherein said metering orifice has a minimum diameter of about 0.5 millimeter.
3. An assembly in accordance with claim 1 wherein said metering orifice terminates in an exit cone region that diverges in the direction of oil flow.
4. An assembly in accordance with claim 1 wherein said body is formed of a molded plastic.
5. An assembly in accordance with claim 4 wherein said body is formed by injection molding of said molded plastic.
6. An assembly in accordance with claim 5 wherein said filter mesh element is included in said opening by overmolding.
7. An assembly in accordance with claim 1 further comprising a press limiter extending from said body for positioning said assembly in said oil gallery.
8. An assembly in accordance with claim 1 wherein said oil gallery is an element of a Lifter Oil Manifold Assembly.
9. An assembly in accordance with claim 1 wherein said body includes a cylindrical wall.
10. An assembly in accordance with claim 1 wherein the opening of said body is disposed in said outer wall.
11. An internal combustion engine comprising a Lifter Oil Manifold Assembly,
wherein said Lifter Oil Manifold Assembly includes a combined oil filtration and metering assembly for filtering and metering oil, and
wherein said combined oil filtration and metering assembly includes
a hollow body having an outer wall defining an internal chamber and having an opening,
a filter mesh element disposed in the opening of said body for filtering particles from oil passing through said Lifter Oil Manifold into said chamber, and
a metering orifice formed in said wall for exit of filtered oil from said chamber at a predetermined flow rate into said Lifter Oil Manifold.