Roller with weakened excitation behaviour

Abstract

A roller for belt tensioning systems or wrap drives having a hollow hub and a cylindrical running ring. The hollow hub and the running ring are connected to one another by an annular web and wherein, on both sides of the annular web, the hollow hub and the running ring are supported relative to one another by circumferentially distributed radially arranged ribs. The number of ribs on both sides of the annular web can be a prime number. In addition, or in the alternative, the ribs on both sides of the annular web can be arranged so as to be non-centrically circumferentially offset. In addition, or in the alternative, the number of ribs on both sides of the annular web can deviate from one another. In addition, or in the alternative, the rib assembly can be provided with variable pitch angles around the circumference.

1 . A roller ( 11 ) for belt tensioning systems or wrap drives, comprising a hollow hub ( 12 ) and a cylindrical running ring ( 13 ), wherein the hollow hub ( 12 ) and the running ring ( 13 ) are connected to one another by an annular web ( 14 ) and wherein, on both sides of the annular web ( 14 ), the hollow hub ( 12 ) and the running ring ( 13 ) are supported relative to one another by a plurality of circumferentially distributed radially arranged ribs ( 17 ,  18 ), and wherein the number of ribs ( 17 ,  18 ) on both sides of the annular web ( 14 ) is a prime number. 
   
   
       2 . A roller according to  claim 1 , wherein the number of the ribs is selected from the group of 29, 31 or 37. 
   
   
       3 . A roller ( 11 ) for belt tensioning systems or wrap drive, comprising a hollow hub ( 12 ) and a cylindrical running ring ( 13 ), wherein the hollow hub ( 12 ) and the running ring ( 13 ) are connected to one another by an annular web ( 14 ) and wherein, on both sides of the annular web ( 14 ), the hollow hub ( 12 ) and the running ring ( 13 ) are supported relative to one another by a plurality of circumferentially distributed radially arranged ribs ( 17 ,  18 ), and wherein the ribs ( 17 ,  18 ) on both sides of the annular web ( 14 ) are provided in identical numbers and are circumferentially offset relative to one another. 
   
   
       4 . A roller according to  claim 3 , wherein the ribs ( 17 ) on one side of the annular web are non-centrically offset relative to the ribs ( 18 ) on the other side of the annular web by a fraction of the pitch angle of the rib assemblies. 
   
   
       5 . A roller ( 11 ) for belt tensioning systems or wrap drive, comprising a hollow hub ( 12 ) and a cylindrical running ring ( 13 ), wherein the hollow hub ( 12 ) and the running ring ( 13 ) are connected to one another by an annular web ( 14 ) and wherein, on both sides of the annular web ( 14 ), the hollow hub ( 12 ) and the running ring ( 13 ) are supported relative to one another by a plurality of circumferentially distributed radially arranged ribs ( 17 ,  18 ), and wherein the numbers of ribs ( 17 ,  18 ) on both sides of the annular web ( 14 ) deviate from one another. 
   
   
       6 . A roller according to  claim 5 , wherein the numbers of ribs ( 17 ,  18 ) on both sides of the annular web ( 14 ) comprise successive prime numbers. 
   
   
       7 . A roller ( 11 ) for belt tensioning systems or wrap drives, comprising a hollow hub ( 12 ) and a cylindrical running ring ( 13 ), wherein the hollow hub ( 12 ) and the running ring ( 13 ) are connected to one another by an annular web ( 14 ) and wherein, on both sides of the annular web, the hollow hub and the running ring are supported relative to one another by a plurality of circumferentially distributed, radially arranged ribs ( 17 ,  18 ), wherein the pitch angles of the rib assembly between the ribs ( 17 ,  18 ) vary around the circumference and include smaller pitch angles and greater pitch angles. 
   
   
       8 . A roller according to  claim 7 , wherein the smaller pitch angles on one side of the annular web ( 14 ) are located opposite greater pitch angles on the other side of the annular web ( 14 ) and the greater pitch angles on the one side of the annular web ( 14 ) are located opposite the smaller pitch angles on the other side of the annular web ( 14 ). 
   
   
       9 . A roller according to  claim 1 , further comprising a number of circumferentially distributed injection points ( 19 ) resulting from the production process, which number is a prime number. 
   
   
       10 . A roller according to  claim 9 , wherein the number of injection points selected from the group of 5, 7, 11 or 13.