Rail carriage group

Abstract

A rail carriage group ( 1 ) for a crane ( 3 ), in particular a gantry crane, which is moveable on rails ( 2 ) with a rectilinear rail profile and around at least one curve and in a transition between the rectilinear rail profile and the curve, with at least two, in particular at least four, running wheels ( 4 ), the running wheels ( 4 ) supporting subframes ( 5 ) of the rail carriage group ( 1 ), and the subframes ( 5 ) supporting a superstructure ( 6 ) of the rail carriage group ( 1 ), wherein at least one of the running wheels ( 4 ), preferably each running wheel ( 4 ), is rotatable individually about a running-wheel axis of rotation ( 7 ) which is vertical in the operating position.

1 . A rail carriage group for a crane which is moveable on rails with a rectilinear rail profile and around at least one curve and in a transition between the rectilinear rail profile and the curve, comprising at least two running wheels that support subframes of the rail carriage group, and the subframes support a superstructure of the rail carriage group, at least one of the running wheels is rotatable individually about a running-wheel axis of rotation which is vertical in an operating position. 
     
     
         2 . The rail carriage group as claimed in  claim 1 , wherein at least one of the running wheels is assigned a dedicated subframe, and the subframe is rotatable together with the running wheel about the running-wheel axis of rotation which is vertical in the operating position. 
     
     
         3 . The rail carriage group as claimed in  claim 1 , wherein in each case two of the running wheels or two of the subframes are rotatable about a common running-wheel axis of rotation which is vertical in the operating position. 
     
     
         4 . The rail carriage group as claimed in  claim 1 , wherein the running wheels for rolling along the rail are in each case rotatable about a running-wheel rotational axis which is horizontal in the operating position, and the running-wheel rotational axis of the running wheel and the running-wheel axis of rotation of the running wheel are arranged skew with respect to each other. 
     
     
         5 . The rail carriage group as claimed in  claim 1 , wherein the running wheels of the rail carriage group jointly transmit an entire load, which, in the operating position, emanates in the vertical direction from the rail carriage group itself and are transmitted from the rail carriage group to the rail. 
     
     
         6 . The rail carriage group as claimed in  claim 1 , wherein at least one of the running wheels is assigned at least one guide roller which is rotatable about a guide-roller rotational axis, which is vertical in the operating position, for rotating the running wheel about the running-wheel axis of rotation by contact of the guide roller with at least one side surface of the rail. 
     
     
         7 . The rail carriage group as claimed in  claim 1 , wherein at least one of the running wheels is assigned at least one flanged guide wheel which is rotatable about a guide-wheel rotational axis, which is horizontal in the operating position, and the at least one flanged guide wheel has at least one flange for rotating the running wheel about the running-wheel axis of rotation by contact of the flange of the flanged guide wheel with at least one side surface of the rail. 
     
     
         8 . The rail carriage group as claimed in  claim 1 , wherein at least one of the running wheels is assigned a motorized drive for rotating the running wheel about the running-wheel axis of rotation. 
     
     
         9 . The rail carriage group as claimed in  claim 8 , wherein the running wheel has at least one flange. 
     
     
         10 . A crane comprising at least one of the rail carriage groups as claimed in  claim 1 . 
     
     
         11 . The rail carriage group as claimed in  claim 1 , wherein there are at least four of the running wheels. 
     
     
         12 . The rail carriage group as claimed in  claim 1 , wherein each of the running wheels is rotatable individually about a respective running-wheel axis of rotation which is vertical in an operating position.