ES424916A1 - Centrifugal advance device for ignition distributor of an internal combustion engine dredge - Google Patents

Abstract

Improvements in the centrifugal advance systems for the internal combustion engine ignition distributor, of the type that includes a mass regulator (8, 9) that, dragged in rotation by the distributor shaft (1), angularly displaces the plate (12) integral with the cam (13) that activates the breaker tab to obtain ignition point variation curves in at least two variation stages, 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 number of turns during which the ignition point decreases as a function of the number of turns of the engine, characterized in that the system comprises two masses centrifuges (8, 9) supported so that they can pivot on an intermediate plate (5) rotatably mounted on the drive shaft (1) and subjected, during the stage in which the ignition point grows in the direction of the advance of the ignition, to the action of at least a first spring (18) that acts against the angular displacement of the solidary plate (12) of the cam (13), stage during which the masses (8, 9) Centrifuges are supported, on the one hand, on the intermediate plate (5), in turn coupled to the solid plate (2) of the control shaft (1) by the conjugated action of a second spring (24) that joins said plates and an adjustable stop (29), made in the intermediate plate (5) and resting on one of the lateral edges of a recess (30) made in the plate (2) integral with the control shaft (1) or vice versa, and on the other hand, in the solidary plate (12) of the cam (13) that causes the angular displacement of the plate (12) in the sense for which the advance of the ignition increases as a function of the number of turns, until the moment in which the centrifugal masses (8, 9) are supported, by fingers (10, 11) arranged on their lower faces, on a stop (27) in the form of a ramp pr actuated on or in the plate (2) integral with the drive shaft, from which point the ignition point does not vary any further until the centrifugal forces, which increase due to the increase in the number of turns, overcome the stresses of the first and second springs (18 and 24) and cause, due to the sliding of the support of the centrifugal masses along the ramp-shaped stop, the angular displacement in the opposite direction of the intermediate plate (5) and consequently of the integral plate (12) of the cam to which it is connected by means of the centrifugal masses, direction for which the advance of the ignition decreases depending on the number of turns until the moment when the adjustable stop rests on the other lateral edge of the recess (3, 4) practiced on the plate (2). (Machine-translation by Google Translate, not legally binding)