ES432776A1 - Centrifugal advance device for the ignition distributor of an internal combustion engine - Google Patents

Abstract

Centrifugal advance device for the ignition distributor of the internal combustion engine, which includes a counterweight regulator which, dragged in rotation by the distributor shaft, angularly displaces the joint plate of the cam that drives the breaker to obtain curves of ignition point variation in at least two stages of variation, of which at least one in the lower area of the number of turns during which the ignition point increases as a function of the number of turns and another in the upper area of the lap numbers during which the ignition point decreases as a function of the engine lap numbers, characterized by comprising two main centrifugal masses (14 and 15) coupled to two auxiliary centrifugal masses (10 and 1) ) and supported so that they can pivot on an intermediate plate mounted so that it can rotate on an intermediate plate (6) rotatably mounted on re the control shaft (l) and elastically coupled to the joint plate of the control shaft (2) and to the joint plate of the cam (16) by means of respectively a first (22) and a second spring (25) that joins the aforementioned plates, the main centrifugal masses of which are subjected during the stage in which the ignition point increases in the direction of advance at ignition by the action of at least a third spring (28) with an elastic constant smaller than the first spring (22) and that acts against the angular displacement of the cam joint plate (16), a stage during which the main centrifugal masses are supported by ramp-shaped holes (20 and 21) provided in the joint plate of the cam (16), cause its angular displacement in relation to the intermediate plate (6) and consequently in relation to the plate (2) integral with the drive shaft to which it is coupled by the first spring (22) in the direction to which advance in the ignition do increases as a function of the number of turns of the engine until the moment in which the mentioned masses (14 and 15) rest on the bottom of the mentioned holes (20 and 21), moment from which the ignition point does not vary until the centrifugal forces developed by the auxiliary centrifugal masses (10 and 11) that increase due to the increase in the number of turns of the motor, take it to the tension of the first spring (22), whose auxiliary centrifugal masses that are supported by holes (3 and 4) in the form of a ramp provided on the plate (2), integral with the control shaft, cause the angular displacement in the opposite direction to the intermediate plate (6) and consequently to the plate (16) integral with the cam to which it is attached by means of the main centrifugal masses, direction for which the advance in ignition decreases as a function of the number of turns until the moment when the auxiliary centrifugal masses rest on the bottom of the holes in the plate in solidarity with the command tree. (Machine-translation by Google Translate, not legally binding)