Navistar International Transportation Corporation

International Engine Intellectual Property Company, LLC

David B Meisner

Thomas B Warmoth

Manuel Gamboa

James J Grinsteiner

Titus J Iwaszkiewicz

Ronald J Rogalla

Griselda Collet-Santacruz

Ruben D Varela

An apparatus for and method of mounting a flange to an oil pickup tube uses a bracketed flange mounting ( , and ). The bracketed flange mounting includes a flange ( ) with a flange extension ( ) in connection with a bracket ( ) that is mounted to an oil pickup tube ( ) between its two ends. The bracketed flange mounting ( , and ) may couple to an engine crank case or oil pump inlet in the same way as prior assemblies without a bracketed flange mounting, thus no retooling of any other part of the engine is required.

Oil pickup tube assembly

There is provided a hydraulic fuel system having an integrated and internally mounted oil circuit for providing high pressure in a hydraulically operated electronically controlled fuel injector fuel system. There is provide an internally mounted high pressure pump in a pump housing in the crankcase and connected to internally routed high pressure lines that deliver the oil to high pressure oil rails. There is provide an integrated low pressure oil reservoir in the crank case that comprises a low pressure oil cooler and reservoir. The oil cooler is preferably immersed inside the low pressure oil reservoir to optimize available engine space and improve heat transfer. There is also provided a high pressure pump filter that covers a high pressure pump inlet feed passage to prevent debris from passing into the high pressure oil pump and other components on the high pressure oil circuit.

Hydraulic fuel system

The present invention describes a filter screen for removing debris from the hydraulic actuating fluid in an internal combustion engine having a hydraulic pump for supplying hydraulic actuating fluid to hydraulically-actuated unit fuel injectors. An upper portion of a priming reservoir is mounted on a front cover of the engine. The front cover forms a lower reservoir portion. A screen assembly is positioned adjacent to an interface defining an entrance from the upper reservoir portion to the lower reservoir portion. The screen assembly includes a filter screen enclosing the entrance to force the actuating fluid to pass through the filter screen, thus retaining debris that exceed the mesh size of the filter screen.

Hydraulic system with a filter screen for internal combustion engine

The present invention describes a filter gasket (50) for removing debris from the hydraulic fluid in an internal combustion engine (10). An upper reservoir structure (30) is mounted on a front cover (14) of the engine (10) at interface (46). The front cover forms a lower reservoir (16). The upper reservoir structure (30) forms an upper reservoir (35). A gasket (42) is disposed along the interface (46) to seal the upper reservoir structure (30) to the front cover (14). A screen assembly (70) is positioned adjacent to the interface (46). The screen assembly (70) includes a filter screen (76) connected to a plate member (56). The plate member (56) operatively engages the gasket (42). The plate member (56) forces hydraulic fluid to pass through the filter screen (76), thus retaining debris that exceed the mesh size of the filter screen (76).

Hydraulic system with a combination filter screen and gasket

A diesel engine having a lubricating oil sump and a low pressure lubricating oil pump, is provided with a hydraulically-operated, electronically-controlled unit fuel injector operating system of the type having a unit fuel injector, a high pressure pump, a high pressure lubricating oil supply passage from said pump to said unit injector, a fuel supply to said unit injector, and an electronically controlled valve in said unit injector for controlling the application of the pressure of the lubricating oil to force said fuel to be expelled from said injector, wherein a priming reservoir is operatively connected to the low pressure lubricating oil pump and disposed upstream and above the high pressure supply pump and above the high pressure supply passage, preferably being disposed in the engine front cover and having a restricted return line to the oil sump for venting air from said reservoir, a siphon passage establishes fluid communication between said reservoir and said high pressure passage independently of the high pressure supply pump, and a check valve is disposed in the siphon passage to permit fluid flow from said reservoir to said high pressure passage, when the engine is not operating, while preventing flow from the high pressure passage to the priming reservoir, when the engine is operating.

Priming reservoir and volume compensation device for hydraulic unit

A tandem fuel pump assembly for internal combustion engines includes a housing having a fixed spring retainer mounted thereinside which supports a diaphragm pump biassing spring thereabove to force a diaphragm defining the movable lower wall of a first pumping chamber to reduce the volume thereof and eject fuel from an outlet thereof preferably through a fuel filter to the inlet of a second piston pumping chamber. A second biassing spring supported below the spring retainer forces a pumping piston downwardly to reduce the volume of the second pumping chamber and thereby eject fuel therefrom to an engine fuel rail for injection into the engine therefrom. The diaphragm and piston are mechanically connected by a pump stem through a lost motion connection to accommodate differing pumping strokes of the two pumps, so that a single tappet actuated by the engine camshaft mechanically raises the piston to cause movement thereof to fill the second piston pump chamber while the biassing spring of the piston pump pulls the diaphragm through the stem against the action of its biasing spring to fill the first chamber during the pumping stroke of the piston pump.

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Carol Stream, IL, United States of America

David B Meisner