Dirt protection cover arrangement, dirt protection cover device for said arrangement, and coupling method involving same

1. A dirt protection cover arrangement with a semi-trailer ( 2 ) and a towing vehicle ( 3 ), for closing a hollow-bored king pin ( 21 ) on the semi-trailer ( 2 ) for an automatic fifth wheel, wherein the king pin ( 21 ), serving as a counter-bearing for a fifth wheel ( 31 ) of the towing vehicle ( 3 ), is arranged on an underside ( 20 ) of the semi-trailer ( 2 ), wherein a dirt protection cover device ( 1 ) is arranged adjacent to the underside ( 20 ) of the semi-trailer ( 2 ) and rotatable about the king pin ( 21 ), wherein the dirt protection cover device ( 1 ) includes a dirt protection cover ( 11 ) for covering the bore ( 22 ) of the king pin ( 21 ) configured on the dirt protection cover device ( 1 ) such that, during a coupling process, the dirt protection cover ( 11 ) is displaceable from a basic position covering a bore ( 22 ) in the king pin ( 21 ) into a coupled position exposing the bore ( 22 ).

2. The dirt protection cover arrangement according to claim 1 , wherein the dirt protection cover device ( 1 ) has a lateral guide ( 12 ) with a thrust element ( 13 ) for moving the dirt protection cover ( 11 ), wherein the thrust element ( 13 ) is configured to be movable in the direction radial to the king pin ( 21 ), parallel to the underside ( 20 ) of the semi-trailer ( 2 ), and is coupled to the dirt protection cover ( 11 ).

3. The dirt protection cover arrangement according to claim 2 , wherein a drive pin ( 17 ) is provided on the thrust element ( 13 ) which is formed to be taken along during the coupling operation of the fifth wheel plate ( 31 ) by an actuator ( 33 ) of the engaging towing vehicle ( 3 ), wherein a towing vehicle ( 3 ) with automatic fifth wheel coupling is provided with this actuator ( 33 ) on the fifth wheel plate ( 31 ).

4. The dirt protection cover arrangement according to claim 3 , wherein the actuator ( 33 ) on the fifth wheel plate ( 31 ) is a press pad ( 33 ) bridging an insertion slot ( 32 ), which in the installed position allows a free introduction of the king pin ( 21 ) into the insertion slot ( 32 ) and which cooperates with the drive pin ( 17 ), so that the actuator ( 33 ) during the coupling process shifts the drive pin ( 17 ) and thus the dirt protection cover ( 11 ) into the bore ( 22 ) exposing coupled position and holds it in this position against the pressure of the first spring ( 15 ).

5. The dirt protection cover arrangement according to claim 2 , wherein a first spring ( 15 ) is provided in the lateral guide ( 12 ), which first spring ( 15 ) spring-biases the thrust element ( 13 ) in the direction of the basic position in which the bore ( 22 ) of the king pin ( 21 ) is covered.

6. The dirt protection cover arrangement according to claim 2 , wherein a second spring ( 16 ) is provided on the thrust element ( 13 ) which second spring ( 16 ) holds the dirt protection cover ( 11 ) in the axial direction on the free end face ( 24 ) of the king pin ( 21 ).

7. The dirt protection cover arrangement according to claim 1 , wherein the dirt protection cover device ( 1 ) has a width which is smaller than the width of the insertion slot ( 32 ) of the fifth wheel plate ( 31 ).

8. The dirt protection cover arrangement according to claim 7 , wherein the dirt protection cover device ( 1 ) when installed has splayed leaf springs ( 18 ) on first and second sides of its flanks.

9. The dirt protection cover arrangement according to claim 1 , wherein the king pin ( 21 ) has a cylindrically symmetrical king pin body protruding down from the underside ( 20 ) of the semi-trailer ( 2 ), wherein a part of the king pin body near the underside ( 20 ) is provided with a guide groove ( 23 ), in which the dirt protection cover device ( 1 ) is held rotatable around the king pin ( 21 ).

10. A dirt protection cover device ( 1 ) for a dirt protection cover arrangement according to claim 1 .

11. A method for coupling a semi-trailer ( 2 ) and a towing vehicle ( 3 ), with a dirt protection cover arrangement according to claim 1 , comprising

moving the towing vehicle ( 3 ) with its fifth wheel ( 31 ) backwards under the semi-trailer ( 2 ) with its king pin ( 21 ),

first, allowing the dirt protection cover device ( 1 ) during the coupling process to rotate around the king pin in such a manner that it is located in an insertion slot ( 32 ) of the fifth wheel plate ( 31 ),

during further approach of the towing vehicle ( 3 ), displacing the dirt protection cover ( 11 ) from a basic position covering the bore ( 22 ) of the king pin ( 21 ) into a position exposing the bore ( 22 ), and

completing the coupling operation.

12. The method for coupling according to claim 11 , wherein the displacement of the dirt protection cover ( 11 ) during the coupling process takes place against a spring load acting in the direction of the basic position.

13. The method for coupling according to claim 11 , wherein the displacement of the dirt protection cover ( 11 ) is initiated by a towing vehicle ( 3 ) with automatic fifth wheel.

14. The method for coupling according to claim 11 , wherein the dirt protection cover device ( 1 ) which is freely rotatable around the king pin ( 21 ) is centered centrally to the insertion slot ( 32 ).