Anti-rotation mechanism for a high pressure fuel supply pipe in a common rail fuel system
AssigneeDetroit Diesel Corporation
InventorsSamuel Pearlman, James Edward McCarthy, Jr., David Henry Mitchell, Ronald Michael Tkac
Life of this patent
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Abstract
A circular cross-sectional fuel pipe can be prevented from undesired rotation in an engine cylinder head, by a key-key slot combination having a relatively small radial dimension. The key slot is formed by a groove formed in a cylindrical sleeve that is press fit in a counterbore machined in the cylinder head. The mating key can be a ball, or pin, or bar press fit into a side surface of the fuel pipe.
Claims5
In combination an engine cylinder head, a fuel injector extending through said cylinder head, and a fuel supply means located within the cylinder head for supplying pressurized fuel to said injector;
- said fuel supply means comprising a high pressure fuel pipe, and means preventing rotary movement of said fuel pipe;
- said rotation-prevention means comprising a sleeve press-fit into said cylinder head, and a key carried by said fuel pipe;
- said sleeve heaving an axial slot therein, said key extending from said fuel pipe into said slot to prevent rotation of said pipe within said sleeve.
Dependencies are inferred from the claim text.