Emergency pneumatic spring with centering action

Abstract

A pneumatic spring (LUF) for a rail vehicle (SFZ), comprising two bellow rims (BF 1 , BF 2 ) mounted one above the other and interconnected by pneumatic-suspension bellow (LBA). One of the bellow rims (BF 1 ) comprises a groove (NUT) and the other rim (BF 2 ) comprises a counterpart (GGS) for the groove (NUT), which permit an automatic centering of the two bellow rims (BF 1 ,BF 2 ) in relation to one another in the transversal direction (Q) of the vehicle, if the pneumatic spring (LUF) fails.

1 . A pneumatic spring for a rail vehicle that includes two bellow rims that, when in the assembled state, are arranged above each other and that are connected with each other via an air bellow, characterized in that one of the bellow rims displays a groove and the other of the bellow rims displays a counterpiece for the groove for the automatic centering in the transversal vehicle direction of the two bellow rims with respect to each other in case the pneumatic spring fails.  
   
   
       2 . The pneumatic spring according to  claim 1 , characterized in that the groove is arranged on one of the bellow rims, which, when in the assembled state, lies above the other of the bellow rims.  
   
   
       3 . The pneumatic spring according to  claim 1 , characterized in that the groove is arranged on one of the bellow rims, which, when in the assembled state, lies under the other of the bellow rims.  
   
   
       4 . The pneumatic spring according to  claim 1 , characterized in that at least one of the bellow rims has at least one sliding element.  
   
   
       5 . The pneumatic spring according to  claim 4 , characterized in that each of the at least one sliding elements has a level sliding surface.  
   
   
       6 . The pneumatic spring according to  claim 1 , characterized in that the groove has an essentially triangular cross-section.  
   
   
       7 . The pneumatic spring according to  claim 6 , characterized in that sliding elements are disposed on central portions of a facing surface of at least one of the upper and lower bellow rims, for centering the two bellow rims in case the pneumatic spring fails, and other sliding elements are provided on disposed on lateral portions of the facing surface of the at least one of the upper and lower bellow rims to absorb vertical stresses.  
   
   
       8 . The pneumatic spring according to  claim 7 , characterized in that the sliding elements and the other sliding elements have level sliding surfaces.  
   
   
       9 . The pneumatic spring according to  claim 1 , characterized in that the groove has an essentially trapezoidal cross-section.  
   
   
       10 . The pneumatic spring according to  claim 9 , characterized in that sliding elements are disposed on central portions of a facing surface of at least one of the upper and lower bellow rims, for centering the two bellow rims in case the pneumatic spring fails, and other sliding elements are provided on disposed on lateral portions of the facing surface of the at least one of the upper and lower bellow rims to absorb vertical stresses.  
   
   
       11 . The pneumatic spring according to  claim 10 , characterized in that the sliding elements and the other sliding elements have level sliding surfaces.  
   
   
       12 . The pneumatic spring according to  claim 1 , characterized in that the groove and the counterpiece are made essentially congruent with respect to each other.  
   
   
       13 . The pneumatic spring according to  claim 1 , characterized in that the groove has an apex, and the groove apex and the counterpiece each extend essentially along a longitudinal midplane of its particular associated bellow rim.  
   
   
       14 . The pneumatic spring according to  claim 1 , characterized in that the groove is bent.  
   
   
       15 . The pneumatic spring according to  claim 14 , characterized in that the bend of the groove is adapted to the turnout motion.  
   
   
       16 . The pneumatic spring according to  claim 1 , characterized in that the counterpiece is made in the shape of a cone.  
   
   
       17 . The pneumatic spring according to  claim 1 , characterized in that the upper bellow rim, when in the assembled state, displays a compressed air supply that is arranged centrally upon it.  
   
   
       18 . The pneumatic spring according to  claim 17 , characterized in that the sliding elements are arranged for the centering of the two bellow rims and are made slanted at their corners that face toward the compressed air supply.  
   
   
       19 . A rail vehicle with a bogie or a truck and a freight car body arranged above, characterized in that there is arranged at least one pneumatic spring according to  claim 1  between the bogie and the freight car body.  
   
   
       20 . The rail vehicle according to  claim 19 , characterized in that the apex of the groove extends essentially parallel to the longitudinal vehicle direction.