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An engine attachment pylon for an aircraft including an intermediate piece interposed between a crossbar support and a rigid caisson, a first shear slug passing through a first interface fixing plane between the piece and the caisson, and a second shear slug passing through a second interface fixing

An engine attachment pylon for an aircraft including an intermediate piece interposed between a crossbar support and a rigid caisson, a first shear slug passing through a first interface fixing plane between the piece and the caisson, and a second shear slug passing through a second interface fixing plane between the piece and the support. Also, in side elevation, the intersection point between an axis of the pin and the plane, as well as the intersection point between an axis of the pin and the plane, are located on the common axis of two lateral thrust force collection connecting rods articulated on the crossbar.

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1. An attachment pylon for an aircraft engine, the pylon comprising: a rigid structure forming a caisson;an engine-mounting system mounted fixed on the rigid structure and comprising: a rear engine attachment comprising an attachment body on which is articulated at least one shackle,a thrust force c

1. An attachment pylon for an aircraft engine, the pylon comprising: a rigid structure forming a caisson;an engine-mounting system mounted fixed on the rigid structure and comprising: a rear engine attachment comprising an attachment body on which is articulated at least one shackle,a thrust force collection device for collecting thrust generated by the engine, comprising two lateral connecting rods connected at their rear end to a crossbar articulately mounted on a crossbar support, the crossbar support fixed on the attachment body of the rear engine attachment,an intermediate piece interposed between the crossbar support and the caisson;a first shear slug passing through a first interface fixing plane between the intermediate piece and the caisson; anda second shear slug passing through a second interface fixing plane between the intermediate piece and the crossbar support,wherein in side elevation the intersection point between a longitudinal axis of the first shear slug and the first interface fixing plane, and the intersection point between a longitudinal axis of the second shear slug and the second interface fixing plane, are both coplanar with the longitudinal axes of the two lateral thrust force collection connecting rods. 2. The attachment pylon as claimed in claim 1, wherein the rear engine attachment is provided on each side of the caisson with at least one lateral fitting in contact with a lateral panel of the caisson and mounted fixed on the caisson, the lateral fitting comprising a fixing surface in contact with a fixing surface provided on the rear engine attachment body, wherein the fixing surfaces are located beyond the caisson in the direction of the at least one shackle. 3. The attachment pylon as claimed in claim 2, wherein the caisson is formed by assembling an upper longeron, a lower longeron, two lateral panels, and transversal grooves connecting the longerons and panels, and wherein the fixing surfaces and the rear engine attachment body are located below and at a distance from the lower longeron. 4. The attachment pylon as claimed in claim 2, wherein the intermediate piece includes transversal abutment surfaces in contact with the lateral fittings, the transversal abutment surfaces being located beyond the caisson in the direction of the at least one shackle. 5. The attachment pylon as claimed in claim 4, wherein the rear engine attachment further comprises at least one vertical shear slug successively passing through the attachment body, the intermediate piece, and a longeron of the caisson, the shear slug ensuring thrust force collection is exerted according to a transversal direction of the pylon. 6. The attachment pylon as claimed in claim 2, further comprising on each side of the intermediate piece a secondary fitting mounted fixed on the caisson and including a transversal abutment surface in contact with at least one of the lateral fittings, the transversal abutment surfaces being located beyond the caisson in the direction of the at least one shackle. 7. The attachment pylon as claimed in claim 6, wherein the secondary fitting is mounted on the rear engine attachment body by a transversal connecting axis. 8. The attachment pylon as claimed in claim 7, wherein the rear engine attachment includes, on each side of the caisson, two lateral fittings longitudinally spaced, arranged to be in contact with the lateral panel of the caisson and mounted fixed on the caisson, the transversal connecting axis being located between the two lateral fittings longitudinally spaced. 9. The attachment pylon as claimed in claim 2, wherein the fixing surface of each of the lateral fittings of the rear engine attachment takes a form of a flat surface oriented according to a plane defined by a transversal direction and a longitudinal direction of the pylon. 10. The attachment pylon as claimed in claim 2, wherein each of the two lateral fittings of the rear engine attachment is made of titanium. 11. The attachment pylon as claimed in claim 1, wherein the rear engine attachment defines two half-fasteners which ensure that thrust force collection is exerted according to a vertical direction with respect to the pylon. 12. The attachment pylon as claimed in claim 1, wherein the first and second shear slugs are traversed by plane of symmetry that is both vertical and longitudinal with respect to the pylon. 13. An engine assembly for an aircraft comprising an attachment pylon as claimed in claim 1, and an engine mounted fixed on the pylon. 14. An aircraft comprising at least one engine assembly as claimed in claim 13.