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US 5,626,116 AGranted
Dedicated rocker lever and cam assembly for a compression braking system
AssigneeCummins Engine Company, Inc.
InventorsSteven W. Reedy, David A. Vittorio
Life of this patent
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AssigneeCummins Engine Company, Inc.
InventorsSteven W. Reedy, David A. Vittorio
Estimating the term…
A dedicated compression braking system is provided having at least one engine piston reciprocally mounted within a cylinder for cyclical successive compression and expansion strokes and at least one exhaust valve operable to open in a variable timed relationship with an engine piston compression stroke when the engine is operated in a compression braking mode. The braking system includes an independent exhaust valve actuator assembly, including a braking mode rocker lever and a cam lobe for imparting reciprocable movement to the exhaust valve when the engine is operated in the braking mode. The second exhaust valve actuator assembly includes a braking fluid circuit formed in the braking mode rocker lever and a braking fluid valve and three-way solenoid valve mounted on the braking mode rocker lever for controlling the flow of braking fluid in the braking mode rocker lever during compression braking. The dedicated braking system minimizes the size and weight of the engine and also permits maximum freedom in designing and controlling the operation of the braking system independent of other engine components to maximize the efficiency of compression braking.
A braking system for an internal combustion engine having at least one engine piston reciprocally mounted within a cylinder for cyclical successive compression and expansion strokes and at least one exhaust valve operable to open near the end of an expansion stroke of the engine piston when the engine is operated in a power mode and operable to open in a variable timed relationship to the engine piston compression stroke when the engine is operated in a braking mode, said braking system comprising:
In a braking system for an internal combustion engine having at least one engine piston reciprocally mounted within a cylinder for cyclical successive compression and expansion strokes and at least one power mode exhaust valve operable to open near the end of an expansion stroke of the engine piston when the engine is operated in a power mode and at least one braking mode exhaust valve operable to open in a variable timed relationship to the engine piston compression stroke when the engine is operated in a braking mode, said braking system comprising:
The braking system of claim 18, wherein said braking fluid valve means includes a first check valve for preventing the flow of fluid from said high pressure circuit to said low pressure circuit, a second check valve for permitting the flow of fluid from said high pressure circuit to said drain circuit when said three-way solenoid control valve is in said first position and for preventing flow of fluid from said high pressure circuit to said drain circuit when said three-way solenoid valve is in said second position, and a second biasing means positioned between said first check valve and said second check valve, said second biasing means biases said first check valve to prevent the flow of fluid from said high pressure circuit to said drain circuit when said three-way solenoid valve is in said second position, said second biasing means including a compression spring.
In a braking system for an internal combustion engine having at least one engine piston reciprocally mounted within a cylinder for cyclical successive compression and expansion strokes and at least one exhaust valve operable to open near the end of an expansion stroke of the engine piston when the engine is operated in a power mode and operable to open in a variable timed relationship to the engine piston compression stroke when the engine is operated in a braking mode, said braking system comprising:
Dependencies are inferred from the claim text.