| 摘要 |
A centrifugally actuated control is disclosed for shifting the camshaft of an internal combustion engine between an advanced and retarded condition relative to the ring sprocket and timing chain which are driven by the crankshaft of the internal combustion engine. The control device advantageously causes the shifting from an advanced condition to a retarded condition at a predetermined engine speed or RPM and causes the conditions of engine operation to improve for higher engine speed operation as well as maintains low engine speed operation at high efficiency levels. As the engine is slowed, the device restores the camshaft to its advanced condition for more efficient operation at the lower engine speed. The breakover point or engine speed at which the transition between advanced and retarded positioning occurs may be determined by the strength of the springs contained within the control assembly together with the mass of the centrifugally actuated arms contained therein.
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