Patent ID: 8286612

Claim:
A coupling device for hydraulically and mechanically coupling a fuel injector to a fuel rail of a combustion engine, the coupling device comprising: a fuel injector cup having a central longitudinal axis and being designed to be hydraulically coupled to the fuel rail and to engage a fuel inlet portion of the fuel injector, a first ring element being fixedly coupled to the fuel injector cup, and a second ring element being fixedly coupled to the fuel injector, wherein the second ring element comprises a contact portion extending radially outward relative to the central longitudinal axis and a collar being arranged radially outside the other of the ring elements and extending from the contact portion in a direction of the central longitudinal axis, wherein the other of the ring elements is received in the collar and abuts the contact portion of the second ring element to form a ring element assembly, and the collar of the second ring element having a recess facing the central longitudinal axis, and wherein a circlip is arranged in the recess and is arranged and designed to form a positive fitting coupling between the first ring element and the second ring element, the circlip being designed to prevent a movement of the first ring element relative to the second ring element to retain the fuel injector in the fuel injector cup in direction of the central longitudinal axis, and the collar of the second ring element being configured such that when the other of the ring elements is received in the collar and abuts the contact portion of the second ring element to form the ring element assembly, a ring-shaped gap between an inner surface of the collar and an opposite outer surface of a cylindrical element is sufficiently sized to receive the circlip from outside the ring element assembly and into the recess in the collar.