| US 7,412,952 B2 | ||
| Poppet valve operating system for internal combustion engine | ||
| Jon Jeffries, Canton, Mich. (US); and Todd Brewer, Dearborn, Mich. (US) | ||
| Assigned to Ford Global Technologies, LLC, Dearborn, Mich. (US) | ||
| Filed on Dec. 08, 2006, as Appl. No. 11/608,330. | ||
| Prior Publication US 2008/0135000 A1, Jun. 12, 2008 | ||
| Int. Cl. F01L 1/18 (2006.01) | ||
| U.S. Cl. 123—90.39 [123/90.16; 123/90.27] | 7 Claims |
| 1. A poppet valve operating system for an internal combustion engine, comprising:
a plurality of poppet valves;
a plurality of compression springs for urging said poppet valves into a closed position;
at least one rocker shaft adapted for mounting to a cylinder head of an engine, with said rocker shaft having a cylindrical
outer surface;
a plurality of indexing reliefs formed in the outer cylindrical surface of said at least one rocker shaft; and
a plurality of rocker arms for actuating said poppet valves, with said rocker arms rotatably mounted to said at least one
rocker shaft, and with each of said rocker arms comprising:
a rocker arm body having a circular bore corresponding to the outer cylindrical surface of said at least one rocker shaft;
and
a resiliently biased, telescoping pin housed in said rocker arm body, with said telescoping pin having an inner end projecting
into said circular bore and extending into one of said indexing reliefs, wherein each of said indexing reliefs extends about
the periphery of said outer cylindrical surface of said rocker shaft for a distance sufficient to accommodate a rotational
arc traversed by each of said rocker arms as the rocker arms actuate said poppet valves.
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