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US 12,098,664 B2Granted
Mechanically timed cylinder deactivation system
AssigneeCummins Inc.
InventorScott Robert Bardakjy
Life of this patent
Estimating the term…
Abstract
A system and method for mechanically timed cylinder deactivation includes an inner passage in the camshaft that supplies fluid for deactivating one or more valve opening mechanisms associated with the cylinders of an internal combustion engine.
Claims16
A system, comprising:
- an internal combustion engine including a crankshaft;
- a camshaft operably connected to the crankshaft at a first drive ratio, the camshaft further operably connected to a plurality of valve opening and closing mechanisms associated with a plurality of cylinders of the internal combustion engine, wherein one or more of the plurality of cylinders is configured to be deactivated via the at least one of the plurality of valve opening mechanisms;
- an inner passage within the camshaft that includes a pressurizable fluid in flow communication with the at least one of the plurality of valve opening mechanisms for selectively deactivating one or more of the plurality of cylinders;
- and
- an outer bushing around the camshaft and a radially extending feed path extending from the inner passage to feed fluid from the inner passage to one or more through slots of the outer bushing, and wherein the one or more through slots of the outer bushing provide the fluid from the inner passage to an annular groove of the outer bushing that is in fluid communication with the at least one of the plurality of valve opening mechanisms.
2 more elements
An apparatus, comprising:
- a camshaft for an internal combustion engine and an inner passage within the camshaft that includes a pressurizable fluid, wherein the camshaft includes at least one radially extending feed path in fluid communication with the inner passage for providing pressurized fluid to at least one valve opening mechanism of the internal combustion engine in response to a cylinder deactivation event;
- an inner shaft housed in the camshaft, wherein the inner passage is located in the inner shaft;
- and
- an inner bushing between the inner shaft and the camshaft and an outer bushing around the camshaft, and wherein the inner shaft includes a radially extending feed path extending from the inner passage to feed fluid from the inner passage to one or more through slots of the inner bushing, and wherein the one or more through slots of the inner bushing communicate with one or more transfer holes in the camshaft to provide the fluid from the inner passage to an annular groove of the outer bushing that is in fluid communication with the one or more transfer holes and with the at least one valve opening mechanism.
1 more element
An apparatus, comprising:
- a camshaft for an internal combustion engine and an inner passage within the camshaft that includes a pressurizable fluid, wherein the camshaft includes at least one radially extending feed path in fluid communication with the inner passage for providing pressurized fluid to at least one valve opening mechanism of the internal combustion engine in response to a cylinder deactivation event;
- and
- an outer bushing around the camshaft and a radially extending feed path extending from the inner passage to feed fluid from the inner passage to one or more through slots of the outer bushing, and wherein the one or more through slots of the outer bushing provide the fluid from the inner passage to an annular groove of the outer bushing that is in fluid communication with the at least one valve opening mechanism.
Dependencies are inferred from the claim text.