US PATENT SUBCLASS 123 / 90.15-- .~ With means for varying timing

US PATENT SUBCLASS 123 / 90.15
.~ With means for varying timing

Current as of: June, 1999
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123 /	HD	INTERNAL-COMBUSTION ENGINES

90.1	DF	POPPET VALVE OPERATING MECHANISM {19}
90.15		.~ With means for varying timing {2}
90.16	DF	.~.~> Cam-to-valve relationship
90.17	DF	.~.~> Camshaft or cam characteristics {1}

DEFINITION

Classification: 123/90.15

(under subclass 90.1) Device wherein means provided to vary the time, extent of duration of valve opening relative to the operating cycle of the engine.

(1) Note. In the art herein the timing is varied to maximize engine efficiency, whereas in that of subclasses 319+ it is varied for the purpose of speed regulation or braking.

SEE OR SEARCH CLASS

464, Rotary Shafts, Gudgeons, Housings, and Flexible Couplings for Rotary Shafts,

1+, for a speed responsive device for adjusting the relative rotational position of coupled members.