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AssigneeNavistar International Transportation Corp.
InventorsTitus J. Iwaszkiewicz, David B. Meisner, Ronald J. Rogalla
Estimating the term…
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.
In an engine having a hydraulically-operated, electronically-controlled unit fuel injector operating system of the type having a unit fuel injector, a high pressure pump, passage means for delivering high pressure actuating fluid from said pump to said unit injector, means for supplying fuel to said unit injector, and valve means in said unit injector for controlling the application of said actuating fluid force said fuel to be expelled from said injector, the improvement comprising volume compensating means operatively associated with said actuating fluid passage means and comprising an actuating fluid reservoir, a fluid supply line establishing fluid communication between said actuating fluid reservoir and said high pressure passage means, and a check valve disposed in said fluid supply line and disposed to permit fluid flow from said reservoir to said passage means in the absence of pressure from said high pressure pump while preventing flow from said passage means to said reservoir.
In an engine having a lubricating oil pump, a hydraulically-operated, electronically-controlled unit fuel injector operating system of the type having a unit fuel injector, a high pressure pump, passage means for delivering high pressure lubricating oil from said pump to said unit injector, means for supplying fuel to said unit injector, and valve means in said unit injector for controlling the application of said actuating fluid force said fuel to be expelled from said injector, the improvement comprising a priming reservoir disposed upstream of said high pressure pump and in fluid communication with an inlet thereof and low pressure oil passage means establishing fluid communication between an outlet of said lubricating oil pump and said reservoir.
In an engine having a lubricating oil pump, an oil sump, and a hydraulically-operated, electronically-controlled unit fuel injector operating system of the type having a unit fuel injector, a high pressure pump, high pressure manifold means for delivering high pressure lubricating oil from said pump to said unit injector, means for supplying fuel to said unit injector, and valve means in said unit injector for controlling the application of said actuating fluid force said fuel to be expelled from said injector, the improvement comprising:
In an engine having a lubricating oil pump, an oil sump, and a hydraulically-operated, electronically-controlled unit fuel injector operating system of the type having a unit fuel injector, a high pressure pump having an inlet, low pressure oil supply means establishing fluid communication between said lubricating oil pump and said inlet of said high pressure pump, said low pressure oil supply means including filter means and bypass means for said filter means, high pressure manifold means for delivering high pressure lubricating oil from said pump to said unit injector, means for supplying fuel to said unit injector, and valve means in said unit injector for controlling the application of said actuating fluid force said fuel to be expelled from said injector, the improvement comprising:
Dependencies are inferred from the claim text.