Coupling Device

A coupling device for mechanically coupling a fuel rail to a cylinder head of a combustion engine, the coupling device comprising:

• a holding fixture configured to be mechanically coupled to the fuel rail and comprising a through hole extending between a first surface and a second surface, the second surface opposing the first surface and arranged to face the cylinder head,
• a fastening element configured to be fixedly coupled to the cylinder head, the fastening element comprising a head portion and a shank portion, the head portion facing the first surface of the holding fixture, and the shank portion partially arranged in the through hole and configured to engage with the cylinder head, and
• a retaining element arranged inside the through hole and coupled with the holding fixture, the retaining element comprising in a given latch area a cross-section restriction and engaged with the shank portion at least in the latch area, wherein the retaining element is formed as a one-piece unit,
• wherein the fastening element comprises a thread with a first thread section in a first area of the shank portion and a second thread section in a second area of the shank portion, wherein an intermediate area between the first and second area is shaped complementarily to the latch area of the retaining element.

A coupling device for mechanically coupling a fuel rail to a cylinder head of a combustion engine, the coupling device comprising:

• a holding fixture configured to be mechanically coupled to the fuel rail and comprising a through hole extending between a first surface and a second surface, the second surface opposing the first surface and arranged to face the cylinder head,
• a fastening element configured to be fixedly coupled to the cylinder head, the fastening element comprising a head portion and a shank portion, the head portion facing the first surface of the holding fixture, and the shank portion partially arranged in the through hole and configured to engage with the cylinder head,
• a retaining element arranged inside the through hole and coupled with the holding fixture, the retaining element comprising in a given latch area a cross-section restriction and engaged with the shank portion at least in this latch area, wherein the retaining element is formed as a one-piece unit,
• a first spring element arranged axially between the head portion and the first surface of the holding fixture, and
• a second spring element facing the second surface of the holding fixture and arrangeable axially between the second surface of the holding fixture and the cylinder head.