CONNECTING DEVICE FOR CONNECTING A CLEANING VEHICLE AND CLEANING SYSTEM WITH TWO OR MORE CLEANING VEHICLES

The invention relates to a connecting device for connecting a first cleaning vehicle (12) and a second cleaning vehicle (14) in a connecting direction (40), each of the cleaning vehicles being designed to receive a cleaning appliance and comprising a roller (34) for traveling on a floor (36), the connecting device (18) comprising: a first connecting part (48) which is or can be fixed to the first cleaning vehicle (12), a second connecting part (48) which is or can be fixed to the second cleaning vehicle (14), and a third connecting part (48) which is or can be fixed to the second cleaning vehicle (14), and a second connecting part (50) which is fixed or can be fixed on a second cleaning vehicle (14), the respective connecting part (48, 50) comprising a base region (52) and a protruding region (54, 56) which protrudes from the base region in the direction of the respective other connecting part (48, 50), a first locking element (94) is arranged on a first projecting region (54) of the first connecting part (48