Patent ID: 8857398

Claim:
A coupling device for the communicating connection of two fluid-conveying components, comprising: a first cylindrical connecting body having a plurality of radially outwardly protruding detent elements arranged spaced apart in the circumferential direction, a second cylindrical connecting body having a retaining ring rotatably mounted thereon and moveable between a locking position and an unlocking position, wherein the retaining ring has detent contours arranged complementary to the detent elements and which are positively engaged with the detent elements in the locking position of the retaining ring, wherein the retaining ring has passages located in the circumferential direction between the detent contours arranged complementary to the detent elements and through which the detent elements can be axially fed in the unlocking position of the retaining ring, wherein at least one of (i) the retaining ring has lead-in chamfers arranged on the detent contours and (ii) the first connecting body has lead-in chamfers arranged on the detent elements, the respective lead-in chamfers being oriented in the circumferential direction and which, during the rotation of the retaining ring into the locking position, axially drive the detent elements in an insertion direction, wherein a detent device is provided for rotatably securing the retaining ring in the locking position, wherein the detent device has at least one detent formed on the retaining ring and at least one counter detent formed on the second cylindrical connecting body and with which the detent interlocks upon reaching the locking position, wherein the detent has a detent arm arranged on the retaining ring and configured to be spring elastic in the radial direction, wherein the counter detent has a detent opening which is formed in a collar enclosing the retaining ring and in which the detent arm radially engages upon reaching the locking position so as to be supported on an edge of the detent opening in order to be rotatably secured in the circumferential direction.