US Patent 7533617 Bogie for a rail vehicle

Bogie for a rail vehicle including a first and second wheel unit, each unit having two wheels, and a bogie frame supported on the first and second wheel units via a primary spring unit per wheel. A first primary spring unit being associated with a first wheel of the first wheel unit and a second primary spring unit being associated with a second wheel of the second wheel unit. The first and second wheels being located on the same side of the bogie frame. The first wheel unit and the second wheel unit being connected via a compensation device mounted to the bogie frame. The compensation device being connected to the first and second wheel unit via a first interface and second interface of the first and second primary spring unit, respectively wherein a shift of the first interface causes a shift of the second interface.