초록 ▼

An oil filter for use in heavy duty internal combustion engines is disclosed herein. The oil filter includes an exterior tube with perforations, an interior tube with perforations, a spring located inside the interior tube, a lower and an upper end cap attached to first and second ends of the exteri

An oil filter for use in heavy duty internal combustion engines is disclosed herein. The oil filter includes an exterior tube with perforations, an interior tube with perforations, a spring located inside the interior tube, a lower and an upper end cap attached to first and second ends of the exterior and interior perforated tubes, respectively, and two pleated layers of filter media concentrically located between the interior and exterior perforated tubes without any stabilizing means located between the layers of filter media. The two layers of filter media are formed of a substantial portion of pulp of fibers that contain lignin to reduce softening and swelling of the filter media upon contact with water.

대표청구항 ▼

A filter used in heavy duty internal combustion engine, comprising: an exterior tube with perforations concentric to an axis of said filter, an interior tube with perforations concentric with said axis, a spring concentric with said axis located inside said interior tube with perforations, a lower c

A filter used in heavy duty internal combustion engine, comprising: an exterior tube with perforations concentric to an axis of said filter, an interior tube with perforations concentric with said axis, a spring concentric with said axis located inside said interior tube with perforations, a lower cap and an upper cap attached to first and second ends of said interior and exterior tubes, respectively, and two pleated layers of filtering means concentric with said axis and located between said exterior and interior concentric tubes without any stabilizing means extending between said layers and said end caps; said two layers of filtering means being concentric to said axis and radially spaced apart from each other to avoid radial overlapping of said layers of filtering means when viewed in an axial direction; said end caps and said layers of filtering means defining a space therebetween, the portions of said end caps defining said space being imperforate to fluid material, whereby said fluid material flows radially through said exterior tube, each said layers of filtering means and interior tube, said two layers of filtering means being of equal or different porosity and including a substantial portion of pulp of fibers that contain lignin, derived from disc type refining chips of woods that have a lignin content of at least 10 percent, with steam pressures in the range of 6.3 to 8.4 kg/cm2 at temperatures between 165°and 176.5°C., and using energy levels in the range of approximately 8 to 35 brake horsepower days/air dry ton of raw material.