Energy supply device having a shaft rotatably supported on a polytetrafluoroethylene bearing surface

Abstract

An energy supply device such as a fan wheel generator for a mortar fuse or a battery which can be activated by a fan wheel. The energy supply device has a fast rotating fan wheel shaft which is supported in a housing body of the energy supply device. The fast-rotating fan wheel shaft and the housing body have a common bearing interface, wherein the bearing surface of the shaft or the bearing surface of the housing body is formed of a polytetrafluoroethylene material.

What is claimed is:  
     
         1 . An energy supply device comprising a housing body, a driven rotary shaft rotatably mounted in a bearing surface disposed in the body, the shaft including an outer surface engaging the bearing surface, one of the outer surface and the bearing surface comprises a polytetrafluoroethylene material.  
     
     
         2 . The energy supply device according to  claim 1  comprising a mortar fuse, and including a fan wheel connected to the shaft for rotating the shaft.  
     
     
         3 . The energy supply device according to  claim 1  including a hollow bearing insert mounted in the housing, the insert formed of a polytetrafluoroethylene material and forming the bearing surface.  
     
     
         4 . The energy supply device according to  claim 1  wherein the housing body is injection molded and forms the bearing surface which is coated with a polytetrafluoroethylene material.  
     
     
         5 . The energy supply device according to  claim 1  wherein the Teflon comprises a polytetrafluoroethylene material admixture.  
     
     
         6 . A mortar fuse comprising: 
 a housing;    a body mounted in the housing for rotation and carrying a detonator;    a rotary shaft for rotating the body; and    a fan wheel mounted on the shaft for rotating the shaft;    the shaft being rotatably mounted in a bearing surface disposed in the body, the shaft including an outer surface engaging the bearing surface, one of the outer surface and the bearing surface comprised of a polytetrafluoroethylene material.