Cylindrical roller bearing

Abstract

A cylindrical roller bearing includes a flanged outer race having two inwardly extending flanges. One of the flanges is a flange ring separate from the outer race and fixed to the outer race. Cylindrical rollers are mounted between the outer race and a flangeless inner race, and retained by a retainer which are located radially inwardly of the pitch circle of the cylindrical rollers. With this arrangement, it is not necessary to reduce the widths of pillars of the retainer even if the load capacity is increased by increasing the size or the number of the cylindrical rollers, so that it is possible to increase the load capacity while ensuring strength of the retainer. Also, even if the inner race is separated from the bearing, it is possible to prevent separation of the cylindrical rollers as well as the retainer, which retains the cylindrical rollers, from the outer race.

1 . A cylindrical roller bearing comprising an outer race formed with a cylindrical raceway on an inner periphery of the outer race, an inner race formed with a cylindrical raceway on an outer periphery of the inner race, a plurality of cylindrical rollers disposed between the inner race and the outer race, and a cylindrical retainer formed with circumferentially spaced apart pockets which are equal in number to the cylindrical rollers and in which the respective cylindrical rollers are rotatably received, wherein the outer race is a flanged bearing race having a first flange configured to guide first end surfaces of the respective cylindrical rollers, and a second flange configured to guide second end surfaces of the respective cylindrical rollers, and wherein the inner race is a flangeless bearing race having no flanges,
 wherein the retainer includes pillars defined between the respective adjacent pairs of the pockets and contacting and keeping the cylindrical rollers spaced apart from each other, the pillars having radially outer surfaces located radially inwardly of a pitch circle of the cylindrical rollers such that the pillars are located between a pitch circle of the cylindrical rollers and the cylindrical raceway of the flangeless bearing race,   wherein at least one of the first and second flanges comprises a flange ring which is a separate member from, and fixed to, the flanged bearing race, and wherein the flange ring is configured to be fixed to the flanged bearing race after fitting the cylindrical rollers in the flanged bearing race.   
     
     
         2 . The cylindrical roller bearing of  claim 1 , wherein the flange ring fixed to the flanged bearing race by a fixing arrangement comprising an axial bolt inserting hole formed in the flange ring, a threaded hole formed in an end surface of the flanged bearing race, and a bolt, and wherein said fixing arrangement is configured such that the bolt can be inserted through the bolt inserting hole, driven into the threaded hole and tightened, thereby fixing the flange ring to the flanged bearing race. 
     
     
         3 . The cylindrical roller bearing of  claim 1 , wherein the flange ring is fixed to the flanged bearing race by a fixing arrangement comprising a small-diameter cylindrical surface provided at an axial end of the flanged bearing race and formed with a radial threaded hole, a cylindrical portion provided on the flange ring and fitted on the small-diameter cylindrical surface, said cylindrical portion being formed with a radial bolt inserting hole, and a bolt, and wherein said fixing means is configured such that the bolt can be inserted through the bolt inserting hole, driven into the threaded hole and tightened, thereby fixing the flange ring to the flanged bearing race. 
     
     
         4 . The cylindrical roller bearing of  claim 1 , wherein the flange ring is fixed to the flanged bearing race by a fixing arrangement comprising a pin hole extending from an outer side surface of the flange ring through the flange ring, and into the flanged bearing race, and a pin press-fitted in the pin hole. 
     
     
         5 . The cylindrical roller bearing of  claim 1 , wherein the flange ring is fixed to the flanged bearing race by a fixing arrangement comprising a small-diameter cylindrical surface provided at an axial end of the flanged bearing race, a cylindrical portion provided on the flange ring and fitted on the small-diameter cylindrical surface, a pin hole extending from a peripheral surface of the cylindrical portion through the cylindrical portion, and into the flanged bearing race, and a pin press-fitted in the pin hole. 
     
     
         6 . The cylindrical roller bearing of  claim 1 , wherein the flange ring is fixed to the flanged bearing race by a fixing arrangement comprising a plurality of circumferentially spaced apart annular grooves each formed partially in a peripheral surface of the flanged bearing race and partially in a peripheral surface of the flange ring so as to bridge the flanged bearing race and the flange ring when the flange ring is brought into abutment with an end surface of the flanged bearing race, and annular fastening members each fitted in each of the annular grooves. 
     
     
         7 . The cylindrical roller bearing of  claim 1 , wherein the flange ring is fixed to the flanged bearing race by a fixing arrangement comprising a fitting recess formed in an end surface of the flanged bearing race and configured such that the flange ring can be press-fitted in the fitting recess. 
     
     
         8 . The cylindrical roller bearing of  claim 7 , wherein an annular groove is formed in the end surface of the flanged bearing race. 
     
     
         9 . A cylindrical roller bearing comprising an outer race formed with a cylindrical raceway on an inner periphery of the outer race, an inner race formed with a cylindrical raceway on an outer periphery of the inner race, a plurality of cylindrical rollers disposed between the inner race and the outer race, and a cylindrical retainer formed with circumferentially spaced apart pockets which are equal in number to the cylindrical rollers and in which the respective cylindrical rollers are rotatably received, wherein the inner race is a flanged bearing race having a first flange configured to guide first end surfaces of the respective cylindrical rollers, and a second flange configured to guide second end surfaces of the respective cylindrical rollers, and wherein the outer race is a flangeless bearing race having no flanges,
 wherein the retainer includes pillars defined between the respective adjacent pairs of the pockets and contacting and keeping the cylindrical rollers spaced apart from each other, the pillars having radially inner surfaces located radially outwardly of a pitch circle of the cylindrical rollers such that the pillars are located between the pitch circle of the cylindrical rollers and the cylindrical raceway of the flangeless bearing race,   wherein at least one of the first and second flanges comprises a flange ring which is a separate member from, and fixed to, the flanged bearing race, and wherein the flange ring is configured to be fixed to the flanged bearing race after fitting the cylindrical rollers in the flanged bearing race.   
     
     
         10 . The cylindrical roller bearing of  claim 9 , wherein the flange ring fixed to the flanged bearing race by a fixing arrangement comprising an axial bolt inserting hole formed in the flange ring, a threaded hole formed in an end surface of the flanged bearing race, and a bolt, and wherein said fixing arrangement is configured such that the bolt can be inserted through the bolt inserting hole, driven into the threaded hole and tightened, thereby fixing the flange ring to the flanged bearing race. 
     
     
         11 . The cylindrical roller bearing of  claim 9 , wherein the flange ring is fixed to the flanged bearing race by a fixing arrangement comprising a small-diameter cylindrical surface provided at an axial end of the flanged bearing race and formed with a radial threaded hole, a cylindrical portion provided on the flange ring and fitted on the small-diameter cylindrical surface, said cylindrical portion being formed with a radial bolt inserting hole, and a bolt, and wherein said fixing means is configured such that the bolt can be inserted through the bolt inserting hole, driven into the threaded hole and tightened, thereby fixing the flange ring to the flanged bearing race. 
     
     
         12 . The cylindrical roller bearing of  claim 9 , wherein the flange ring is fixed to the flanged bearing race by a fixing arrangement comprising a pin hole extending from an outer side surface of the flange ring through the flange ring, and into the flanged bearing race, and a pin press-fitted in the pin hole. 
     
     
         13 . The cylindrical roller bearing of  claim 9 , wherein the flange ring is fixed to the flanged bearing race by a fixing arrangement comprising a small-diameter cylindrical surface provided at an axial end of the flanged bearing race, a cylindrical portion provided on the flange ring and fitted on the small-diameter cylindrical surface, a pin hole extending from a peripheral surface of the cylindrical portion through the cylindrical portion, and into the flanged bearing race, and a pin press-fitted in the pin hole. 
     
     
         14 . The cylindrical roller bearing of  claim 9 , wherein the flange ring is fixed to the flanged bearing race by a fixing arrangement comprising a plurality of circumferentially spaced apart annular grooves each formed partially in a peripheral surface of the flanged bearing race and partially in a peripheral surface of the flange ring so as to bridge the flanged bearing race and the flange ring when the flange ring is brought into abutment with an end surface of the flanged bearing race, and annular fastening members each fitted in each of the annular grooves. 
     
     
         15 . The cylindrical roller bearing of  claim 9 , wherein the flange ring is fixed to the flanged bearing race by a fixing arrangement comprising a fitting recess formed in an end surface of the flanged bearing race and configured such that the flange ring can be press-fitted in the fitting recess. 
     
     
         16 . The cylindrical roller bearing of  claim 15 , wherein an annular groove is formed in the end surface of the flanged bearing race.