US 3,942,492 A · Centrifugal ignition advancer device for an ignition system of an internal combustion engine

Abstract

A centrifugal ignition advancer device adapted to advance the ignition timing of an internal combustion engine according to the engine speed comprising two weights adapted to be displaced in accordance with the speed of revolution of a distributor shaft, and two springs differing from each other in initial tension and spring constant, one of the two weights being maintained in its initial position by one of the two springs while the other weight is maintained in its initial position by the other spring. Only one weight is displaced so that the rate of increase in the degree of advance of ignition timing in relation to a change in engine speed can be kept at a lower level at lower engine speeds and the two weights are both displaced so that the rate of increase in the degree of advance of ignition timing in relation to a change in engine speed can be maintained at a higher level at higher engine speeds.

Claims3

Dependent claims

A centrifugal ignition advancer device for an ignition system of an internal combustion engine comprising:

a shaft adapted to rotate in conjunction with the operation of the engine;
a pair of weights capable of being displaced by centrifugal forces produced by the rotation of said shaft;
a pair of resilient members each connected to one of said weights so as to restore the respective weights to their original positions against the centrifugal forces, one or the first of said pair of resilient members being higher in spring constant than the other or the second resilient member and connected to the associated weight with a lower initial tension than the second resilient member;
and
transmission means adapted to cause ignition signal producing means to be displaced in an ignition advance direction relative to said shaft when said weights are displaced either singly or in combination, the ignition signal producing means adapted to be rendered operative to effect ignition advances upon the first weight undergoing displacement when the first weight connected to said first resilient member is displaced and the second weight connected to said second resilient member is not displaced.

2 more elements

Dependencies are inferred from the claim text.

Centrifugal ignition advancer device for an ignition system of an internal combustion engine

Life of this patent

Centrifugal ignition advancer device for an ignition system of an internal combustion engine

Life of this patent

Abstract

Claims3