A coupling arrangement for selectively engaging and disengaging a first and a second shaft (102, 104) extending coaxially along an axis A, wherein the coupling arrangement comprises: a first coupling member configured to be secured to the first shaft, wherein the first coupling member has a circular cross-sectional shape transverse to the axis A and an outer surface comprising at least one groove (109, 110); a second coupling member configured to be secured to the second shaft, wherein the second coupling member comprises a sleeve shaped element coaxial with axis A and at least one through-hole (116, 117, 136, 137) arranged in the sleeve shaped element radially to the axis A, wherein the first coupling member is configured to be rotatably housed within the sleeve shaped element; a selecting element; and at least one locking element (120, 122, 140, 142), wherein the at least one locking element is spherically shaped; wherein the coupling arrangement is configured to assume an engaged configuration, in which the selecting element is arranged in an engaged position such that the at least one locking element is held in place by the selecting element in the at least one through-hole and is in contact with an inner surface (132, 134) of the at least one through-hole and the at least one groove, wherein the first and second coupling members are configured to rotate freely with respect to the selecting element when the coupling arrangement is in the engaged configuration; and wherein the coupling arrangement is configured to assume a disengaged configuration, in which the selecting element is arranged in a disengaged position such that the at least one locking element is allowed to move out of the at least one groove. a first coupling member configured to be secured to the first shaft, wherein the first coupling member has a circular cross-sectional shape transverse to the axis A and an outer surface comprising at least one groove (109, 110); a second coupling member configured to be secured to the second shaft, wherein the second coupling member comprises a sleeve shaped element coaxial with axis A and at least one through-hole (116, 117, 136, 137) arranged in the sleeve shaped element radially to the axis A, wherein the first coupling member is configured to be rotatably housed within the sleeve shaped element; a selecting element; and at least one locking element (120, 122, 140, 142), wherein the at least one locking element is spherically shaped; wherein the coupling arrangement is configured to assume an engaged configuration, in which the selecting element is arranged in an engaged position such that the at least one locking element is held in place by the selecting element in the at least one through-hole and is in contact with an inner surface (132, 134) of the at least one through-hole and the at least one groove, wherein the first and second coupling members are configured to rotate freely with respect to the selecting element when the coupling arrangement is in the engaged configuration; and wherein the coupling arrangement is configured to assume a disengaged configuration, in which the selecting element is arranged in a disengaged position such that the at least one locking element is allowed to move out of the at least one groove.