Patent ID: 8245956
Filing Date: 2012-08-21
Classification: F02M

Abstract:
1. An electromagnetic fuel injector for gaseous fuels comprising: an injection nozzle controlled by an injection valve; a movable shutter to regulate the flow of fuel through the injection valve; an electromagnetic actuator to move the shutter between a closed position and an open position of the injection valve and comprises a fixed magnetic pole, a coil suitable to induce a magnetic flux in the magnetic pole, and a movable anchor magnetically attracted by the magnetic pole; and an absorption element, which is made of a magnetic elastic material and is arranged between the magnetic pole and the anchor; and a protective element made of a magnetic metal material with high surface hardness that is arranged between the absorption element and the anchor, and has at least one portion that is free to move axially towards the absorption element to enable the compression of said absorption element between the anchor and the magnetic pole; wherein the protective element further includes an inner annular portion, an outer annular portion arranged concentrically around the inner portion, and an elastically deformable interconnecting structure that is mechanically arranged between the inner portion and the outer portion to allow a relative axial movement between the inner portion and the outer portion; and wherein the inner portion is fixed centrally to a protuberance of the magnetic pole arranged centrally and the outer portion is free to move axially with respect to the inner portion due to the elastic deformation of the interconnecting structure; the anchor being shaped so as to only touch the outer portion and not touch the inner portion or the interconnecting structure.