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AssigneesPeugeot Citroen Automobiles SA, GM Global Technology Operations LLC
InventorsFabien Gouzonnat, Carlos Pai Joao
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The invention relates to a crankshaft comprising at least: a journal; a first crankpin; a second crankpin; a first arm connecting the first crankpin to the journal; a second arm connecting the second crankpin to the journal; a first pipe extending away from the first crank pin toward the journal and leading onto the surface of the first crankpin on the transverse median plane thereof, and substantially passing to the center of the median plane of the second arm; and a second conduit extending away from the second crankpin toward the journal and leading onto the surface of the second crankpin on the transverse median plane thereof, and substantially passing to the center of the median plane of the second arm, characterized in that the shape of the crankshaft is such that it cannot also comprise a diametric pipe within the transverse median plane of the journal fluidly adjoining the first pipe and the second pipe, and the crankshaft comprises a third non-diametric pipe within the transverse median plan of the journal fluidly connecting the first pipe and the second pipe.
A crankshaft including:
An engine including:
A method for lubricating crankpins of a crankshaft including at least one journal, a first crankpin, and a second crankpin, a first arm connecting the first crankpin to the journal, and a second arm connecting the second crankpin to the journal, the crankshaft having a geometry such that it cannot simultaneously include:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Crankshafts: features relating to lubrication
Prime mover or fluid pump making: crankshaft making
Shafts
Technical subjects covered by former us classification
About 5 years 5 months of term left · ends 19 Mar 2032 (estimated)
The present invention is the U.S. national stage under 35 U.S.C. §371 of International Application No. PCT/FR2012/050104, which was filed on Jan. 18, 2012 and which claims the priority of application FR 1151395 filed on Feb. 21, 2011 the content of which (text, drawings and claims) is incorporated here by reference in its entirety.
The invention concerns the domain of internal-combustion-engine lubrication, and more particularly the lubrication of the moving linkage, that is, the assembly including the pistons, the connecting rods, and the crankshaft.
All internal-combustion engines containing pistons exhibit at least one crankshaft. The crankshaft constitutes the crank of a connecting rod/crank system, which allows the reciprocating motion of the piston to be transformed into the rotary motion of the engine flywheel.
The invention is described in more detail hereinafter, in reference to the figures schematically depicting known prior art as well as a crankshaft in accordance with specific embodiments of the invention.
FIG. 1 presents, in a sectional view, an internal-combustion engine including a crankshaft exhibiting an architecture known in prior art.
FIG. 2a schematically presents a journal and a crankpin for a crankshaft and the system for lubricating the crankpin according to a first embodiment known in prior art.
In FIG. 1, an internal-combustion engine of the in-line, four-cylinder type is depicted, according to a longitudinal-section view of its crankshaft 1.
The crankshaft 1 exhibits a journal 2, on the two sides of which are positioned a first crankpin 31 and a second crankpin 32. A first arm 41 connects the journal 2 to the first crankpin 31. A second arm 42 connects the journal to the second crankpin 32.
A lubrication system allows lubricating oil to feed the crankpins 31 and 32 from the journals. Within the scope of the engine depicted here, each crankpin 31 and 32 is fed by a different journal. The first crankpin 31 is fed by journal 2.