Patent ID: 7216730

Claim:
Driving system for an industrial truck comprising a combustion engine ( 1 ), a two-branch gear transmission ( 5 ) having first and second shafts, the first shaft being coupled to the combustion engine ( 1 ), the second shaft being coupled to a change-over transmission ( 9 ), whose outlet acts on the driven wheels ( 14 , 16 ) of the industrial truck using a collecting transmission ( 13 , 13 a , 13 b ), an electric transmission which a first electric machine ( 8 ) cooperates therewith, with respect to the torque, using the two-branch gear transmission ( 5 ), and a second electric machine ( 12 , 12 a , 12 b ) is coupled using at least one collecting transmission ( 13 , 13 a , 13 b ) to the driven wheels ( 14 , 16 ), the two-branch gear transmission ( 5 ) producing a constant torque ratio between the first electric machine ( 8 ) and at least the first and second shaft and an electrical circuit arrangement ( 11 ) electrically coupling the electric machines ( 8 or 12 , 12 a , 12 b ) and being connected to an electric accumulator, two mechanical hydraulic converters ( 3 , 7 ) one being coupled to the first or second shaft of the two-branch gear transmission ( 5 ) and the second being coupled to the electric transmission, and means for the absorption of hydraulic energy which are coupled with each mechanical hydraulic converter ( 3 , 7 ).