JP2009052653A - Cylindrical roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller-drop type cylindrical roller bearing capable of, when one of an inner ring and an outer ring is the double-flanged bearing ring, easily assembling the other bearing ring with respect to a half-way assembly body having a roller, a retainer and the double-flanged bearing ring assembled, and excellent in assembling property. <P>SOLUTION: One of the inner ring 2 and the outer ring 1, for example, the outer ring 1, is the double-flanged bearing ring having flanges 1b and 1c on axial both ends. The retainer 4 retains one each of cylindrical rollers 3 in a plurality of pockets 5 having both axial ends opened. The cylindrical roller 3 is held by a first drop prevention part 11 provided on an opening edge on an inside diameter side of a pair of inner wall surfaces 10 confronting in the circumferential direction of the pocket 5, and thereby, the retainer 4 retaining the cylindrical roller 3 is detachably fitted to the outer ring 1. Further, a second drop prevention part 12 having a mutual confronting distance A2 smaller than a diameter D of the cylindrical roller 3 and larger than a confronting distance A1 of the first drop prevention part 11 is provided in a position on an outside diameter side more than the first drop prevention part 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cylindrical roller bearing, and more particularly to a roller drop type cylindrical roller bearing in which a retainer holding a roller can be attached to and detached from a race ring with both collars.

  There is a cylindrical roller bearing in which a retainer holding a roller can be attached to and detached from a race ring with both collars (for example, Patent Document 1). This type of cylindrical roller bearing, called a roller drop type, is easy to assemble and can be easily disassembled during maintenance and inspection to easily check the raceway of a ring with two collars. It has been used for a long time as a bearing for main motors and wheels of vehicles.

  FIG. 5 is a cross-sectional view of an example of a conventional roller drop type cylindrical roller bearing, showing a state in which an inner ring is removed. In this example, the outer ring 1 is a raceway with both collars. As shown in FIG. 6, the roller drop-type cylindrical roller bearing retainer 4 is provided with a stopper 11 on the inner wall surface 10 in the circumferential direction of the pocket 5 that holds the cylindrical roller 3. The locking part 11 protrudes toward the inner side in the circumferential direction of the pocket 5 from a part of the opening edge part of the inner wall surface 10 opposite to the outer ring 1, and a pair of locking parts 11 facing each other. The facing distance A (FIG. 5B) is made smaller than the diameter D of the cylindrical roller 3. Thereby, the cylindrical roller 3 is prevented from falling out from the pocket 5 in the inner diameter direction.

The pitch circle radius Ri of the cylindrical roller 3 in a state where the cylindrical roller 3 in the pocket 5 is in contact with the stopper 11 and the pitch of the cylindrical roller 3 in a state in which the cylindrical roller 3 in the pocket 5 is in contact with the raceway 1 a of the outer ring 1. Since the difference d from the circular radius Ro is equal to or greater than the radial height h of the flange portions 1b and 1c of the outer ring 1, as shown by the solid line in FIG. When in contact with the portion 11, the entire cylindrical roller 3 is located on the inner diameter side of the flange portions 1 b and 1 c of the outer ring 1. Thereby, it is possible to incorporate the cylindrical roller 3 into the pocket 5 from the axial direction without interfering with the collar portions 1b and 1c.
JP 2004-84705 A

In the conventional roller drop type cylindrical roller bearing, when an inner ring (not shown) is assembled to the intermediate assembly 13 (FIG. 5) in which the cylindrical roller 3, the cage 4 and the outer ring 1 are assembled, generally the intermediate assembly 13 is held so that the axial direction is horizontal, and the inner ring is inserted into the hollow portion 14 from the side. However, when the intermediate assembly 13 is held as described above, as shown in FIG. 5, the cylindrical roller 3 located above the bearing center is increased by its own weight so that it is greatly increased from the raceway 1a of the outer ring 1 which is a raceway with both collars. Leave. Hereinafter, this state is referred to as “rolling down”. In a state where such a roller drop (roller drop amount B) occurs, the inner ring hits the cylindrical roller 3 and the inner ring cannot be inserted into the assembly 13 in the middle, so that all the cylindrical rollers 3 are placed on the raceway 1 a of the outer ring 1. It is necessary to hold the cylindrical roller 3 with an annular jig (not shown) or the like so as to come into contact. For this reason, the insertability of the inner ring into the intermediate assembly 13 is poor, and it is difficult to attach the shaft to the bearing.
When the inner ring is a raceway with both collars, the reverse of the above, when assembling the outer ring to the assembly in the middle of assembling the cylindrical roller, cage and inner ring, all the cylindrical rollers contact the inner ring raceway. Thus, it is necessary to hold the cylindrical roller. In this case, it is difficult to attach the bearing to the device.

  The object of the present invention is to assemble the other bearing ring to the intermediate assembly in which the roller, the cage and the bearing ring with both collars are assembled when one of the inner ring and the outer ring is a bearing ring with both collars. It is an object of the present invention to provide a roller drop type cylindrical roller bearing which is easy and easy to assemble.

A cylindrical roller bearing according to the present invention includes an inner ring having a raceway on an outer peripheral surface, an outer ring having a raceway on an inner peripheral surface, and a plurality of cylinders rotatably interposed between the races of the inner ring and the outer ring that are raceways. A roller and a retainer that holds each cylindrical roller in a circumferentially spaced manner so that the roller can roll freely, and one of the inner ring and the outer ring protrudes in the radial direction toward the other race ring at both axial ends. A ring with a collar having a collar, and the cage holds the cylindrical rollers one by one in a plurality of pockets opened on both sides in the radial direction, and the pockets are circumferentially connected to each other. A pair of opposing inner wall surfaces is provided with a first stopper portion having an opposing distance smaller than the diameter of the cylindrical roller at an opening edge on the opposite side of the raceway with the flanges, and the cylindrical roller is provided in each pocket. Is in the first locking part The difference between the pitch circle radius of the cylindrical roller in a state where it is in contact with the pitch circle radius of the cylindrical roller in a state where the cylindrical roller is in contact with the ring raceway with both collars in each pocket, By making the height higher than the direction, the retainer in a state where the cylindrical roller is held can be attached to and detached from the raceway with both collars. In this cylindrical roller bearing, the opposing distance between the pockets of the cylindrical rollers is closer to the raceway side with the two collars than the first locking portion of the pair of inner wall surfaces facing each other in the circumferential direction of the pocket. The present invention is characterized in that a second stopper is provided which is smaller than the diameter and larger than the opposing distance of the first stopper.
It is preferable that the opposing distance of the second locking part is a dimension that allows the cylindrical roller to pass by elastically deforming the cage.

According to this configuration, the opposing distance is smaller than the diameter of the cylindrical roller at a position closer to the two raceways with flanges than the first locking portion of the pair of inner wall surfaces facing each other in the circumferential direction of the pocket. And a second locking part larger than the opposing distance of the first locking part is provided, so that an inner ring and an outer ring are provided for the intermediate assembly in which the cylindrical roller, the cage, and the raceway with both collars are assembled. When assembling a bearing ring with no flanges, the cylindrical roller is held on the side of the bearing ring with both collars rather than the second locking part without using a jig or the like separate from the bearing. Can be prevented. Therefore, the assembling property of the raceway which is not a double-ringed raceway with respect to the intermediate assembly is good.
In the case where the opposing distance of the second locking part is a dimension that allows the cylindrical roller to pass by elastically deforming the cage, the cylindrical roller is inserted into the pocket of the cage, and then the cylindrical roller is It can be easily moved to the side of the raceway with both collars rather than the stopper.

Of the inner ring and the outer ring, the bearing ring that does not have both collars has a flange that protrudes in the radial direction toward the bearing ring with both collars at one end in the axial direction, and a lead in chamfer is formed at the other end. good.
If there is a collar at one end in the axial direction of the bearing ring that is not provided with both collars, this bearing ring cannot be assembled to the intermediate assembly from the side where the collar is located, and is assembled to the intermediate assembly from the other end. Become. In that case, if a lead-in chamfer is formed at the other end, it is easy to assemble the raceway ring that is not attached to both ends of the intermediate assembly. That is, since the inner ring 2 has a tapered shape, the inner ring 2 can be inserted into the hollow portion of the intermediate assembly 13 without causing interference with the cylindrical roller 3. As the bearing ring without both flanges is moved in the axial direction toward the assembly side with respect to the assembly on the way, the cylindrical roller is gradually pushed into the raceway side of the bearing ring with both collars by the lead in chamfer. It is held at a predetermined position. For this reason, it is not necessary to position the cylindrical roller accurately from the beginning, and the assembly can be performed with a simple operation.

  The collar ring with both collars can be an outer ring. In that case, the inner ring is a raceway ring with no flanges.

In the cage of the present invention, a pair of inner wall surfaces of the pockets facing each other in the circumferential direction are formed by two partial cylindrical surfaces whose centers are oriented in the axial direction and whose center positions are separated from each other in the radial direction. The boundary part of both partial cylindrical surfaces can be made into the said 2nd fall prevention part.
When the pair of inner wall surfaces facing each other in the circumferential direction of the pocket have the above shape, the pocket can be processed by performing cylindrical hollowing at two locations.

When the cage is made of resin, the pair of inner wall surfaces facing each other in the circumferential direction of the pockets are flat surfaces that are parallel to each other except for a part thereof, A protrusion is formed in which the amount of protrusion in the circumferential direction gradually increases as the distance from the collar ring with the collar increases, and a portion of the protrusion opposite to the two ring rings with the collar is used as the first locking part, A portion on the side of the raceway with both collars may be used as the second retaining portion.
The pair of inner wall surfaces of the pockets facing each other in the circumferential direction do not have a radial undercut shape when viewed from the side of the raceway with both collars. In general, a resin cage for a cylindrical roller bearing processes a pocket by inserting / removing a pocket forming die (pin) from one radial direction of the cage. For this reason, when there is no undercut shape on the inner wall surface of the pocket, it is not necessary to use a complicated mold, the operation of the mold is easily controlled, and a resin cage can be manufactured at low cost. .

  A cylindrical roller bearing according to the present invention includes an inner ring having a raceway on an outer peripheral surface, an outer ring having a raceway on an inner peripheral surface, and a plurality of cylinders interposed between the races of the inner ring and the outer ring, which are raceways, so as to roll freely. A roller and a retainer that holds each cylindrical roller in a circumferentially spaced manner so that the roller can roll freely, and one of the inner ring and the outer ring protrudes in the radial direction toward the other race ring at both axial ends. A ring with a collar having a collar, and the cage holds the cylindrical rollers one by one in a plurality of pockets opened on both sides in the radial direction, and the pockets are arranged in a circumferential direction. A pair of opposing inner wall surfaces is provided with a first stopper portion having an opposing distance smaller than the diameter of the cylindrical roller at an opening edge on the opposite side of the raceway with the flanges, and the cylindrical roller is provided in each pocket. Is in the first locking part The difference between the pitch circle radius of the cylindrical roller in a state where it is in contact with the pitch circle radius of the cylindrical roller in a state where the cylindrical roller is in contact with the ring raceway with both collars in each pocket, In a roller drop type cylindrical roller bearing in which the cage in a state where the cylindrical roller is held can be attached to and detached from the raceway with both flanges by setting the height of the pocket or more in the circumferential direction, The opposing distance is smaller than the diameter of the cylindrical roller at a position closer to the raceway with both flanges than the first locking portion on the pair of inner walls facing each other, and the first locking portion Since the second locking part larger than the facing distance is provided, when one of the inner ring and the outer ring is a raceway with both collars, an intermediate assembly in which the rollers, the cage, and the raceways with both collars are assembled for Cormorant easily assembled one of the bearing ring, is good assemblability.

  A first embodiment of the present invention will be described with reference to FIGS. This cylindrical roller bearing rolls between an outer ring 1 having a raceway 1a on its inner peripheral surface, an inner ring 2 having a raceway 2a on its outer peripheral surface, and the races 1a and 2a of these outer ring 1 and inner ring 2 which are raceways. A plurality of cylindrical rollers 3 that are freely interposed, and a retainer 4 that holds the cylindrical rollers 3 in a circumferential direction so as to roll freely.

  The outer ring 1 is a raceway with both flanges having flange portions 1b and 1c projecting toward the inner diameter side at both ends in the axial direction. The inner ring 2 has a flange portion 2b that protrudes toward the outer diameter side at one end in the axial direction, and a lead-in chamfer 2c is formed at the other end. The outer circumference of the cylindrical roller 3 is formed as a rolling surface 3a, and the cylindrical roller 3 can freely roll between the two raceways 1a and 2a. Each cylindrical roller 3 is placed in a pocket 5 of the cage 4 and is held at a predetermined interval in the circumferential direction. The cage 4 includes an annular cage body 6 in which a plurality of pockets 5 for holding the cylindrical rollers 4 are formed at predetermined intervals in the circumferential direction, and an annular lid applied to one side of the cage body 6 in the axial direction. 7 and a flange 8 that couples the annular lid 7 to the cage body 6. The pocket 5 formed in the cage body 6 is open to the side on which the annular lid 7 is applied when the annular lid 7 is not applied.

As shown in FIGS. 2B and 2C, the pair of inner wall surfaces 10 of the pockets 5 facing each other in the circumferential direction are such that the centers O1 and O2 are both oriented in the axial direction and the center positions are in the radial direction. The two partial cylindrical surfaces 10a and 10b are separated from each other. The radii of both partial cylindrical surfaces 10a and 10b are the same. An inner diameter side edge of the inner wall surface 10 is a first stopper 11 that prevents the roller 5 from falling from the pocket 5. The facing distance A1 between the pair of first locking parts 11 is set to be smaller than the diameter D of the cylindrical roller 3. Moreover, the boundary part of both the partial cylindrical surfaces 10a and 10b in a pair of inner wall surface 10 is the 2nd fall prevention part 12 which prevents the roller fall at the time of a bearing assembly. The facing distance A2 between the pair of second retaining portions 12 is set to be smaller than the diameter D of the cylindrical roller 3 and larger than the facing distance A1 between the first retaining portions 11. The roller drop amount B of the cylindrical roller 3 held between the second stopper 12 and the raceway 1a of the outer ring 1 is small.
Further, the pitch circle radius Ri of the cylindrical roller 3 in a state where the cylindrical roller 3 in the pocket 5 is in contact with the first stopper 11, and the cylindrical roller in a state in which the cylindrical roller 3 in the pocket 5 is in contact with the raceway 1 a of the outer ring 1. The difference d from the pitch circle radius Ro of 3 is equal to or greater than the radial height h of the flange portions 1b, 1c of the outer ring 1. That is, the relationship of (Ro−Ri)> h is established.

  The material of the cage body 6 is elastically deformable, and for example, metal or resin is used. The facing distance A1 between the first locking portions 11 is set to be slightly smaller than the diameter D of the cylindrical roller 3, and the opposing distance A1 is changed to the diameter of the cylindrical roller 3 by elastically deforming the cage body 6. It is possible to make it larger than D.

  A method for assembling the cylindrical roller bearing will be described. The cylindrical roller 3 is incorporated in each pocket 5 of the cage main body 6 so as to be held between the first locking portion 11 and the second locking portion 12, and the annular lid 7 is mounted on the cage body 6. Attach with 鋲 8. A cage 4 incorporating this cylindrical roller 3 is disposed on the inner periphery of the outer ring 1. Then, the cylindrical roller 3 is pushed into the outer diameter side, and is held on the outer diameter side also by the second locking part 12. By pushing the cylindrical roller 3 to the outer diameter side, the retainer 4 is elastically deformed, and the cylindrical roller 3 can pass between the pair of second retaining portions 12. When the cylindrical roller 3 passes between the second stoppers 12, the cage 4 is elastically restored and returns to its original state. Thereby, it becomes the intermediate assembly 13 which assembled the cylindrical roller 3, the holder | retainer 4, and the outer ring | wheel 1. As shown in FIG.

  The inner ring 2 is assembled to the intermediate assembly 13. Assembling is performed by inserting the inner ring 2 into the hollow portion 14 of the intermediate assembly 13 from the side where the lead-in chamfer 2c is formed. At that time, in general, the assembly 13 and the inner ring 2 are assembled while being held in a state where the axial direction is horizontal, but each cylindrical roller 3 is held by the second locking part 12, so Rolling out does not occur. Further, a lead in chamfer 2c is formed on the distal end side in the insertion direction of the inner ring 2, and the inner ring 2 has a tapered shape. Therefore, it can be inserted into the hollow portion 14 of the intermediate assembly 13 without causing interference with the cylindrical roller 3. As the inner ring 2 is moved in the axial direction toward the assembly side, the cylindrical roller 3 is gradually pushed into the raceway 1a side of the outer ring 1 by the lead-in chamfer 2c, and the cylindrical roller 3 is held at a predetermined position. Then, the assembly of the bearing is completed by inserting the inner ring 2 to a predetermined axial position. Thus, since it is not necessary to position the cylindrical roller 3 using a special jig or the like, the assembling work is simple.

  When disassembling the assembled cylindrical roller bearing, contrary to the above, first the inner ring 2 is extracted, and then the cage 4 incorporating the cylindrical roller 3 is removed. When removing the cage 4, the cylindrical roller 3 is pulled toward the inner diameter side, passed through the second locking part 12, and held between the first locking part 11 and the second locking part 12. To be. Thereby, the whole cylindrical roller 3 comes to be located on the inner diameter side with respect to the flange portions 1 b and 1 c of the outer ring 1, and the cage 4 can be removed from the outer ring 1. This disassembly work is also easy.

  3 and 4 show a second embodiment of the present invention. In this embodiment, the basic configuration and operation are the same as those of the first embodiment, but the cage is different from that of the first embodiment. The cage 4 of this embodiment is made of resin by injection molding and is integrated.

In the cage 4, a pair of inner wall surfaces 10 facing each other in the circumferential direction of the pockets 5 are flat surfaces except for a part thereof. A protruding portion 15 is formed on a part of the inner wall surface 10 so that the protruding amount in the circumferential direction increases stepwise toward the inner diameter side. The step portion on the inner diameter side of the protruding portion 15 serves as a first stopper portion 11, and the step portion on the outer diameter side serves as a second stopper portion 12. Both the locking portions 11 and 12 are flat surfaces in which a pair of opposed portions are parallel to each other. Similar to the first embodiment, the facing distance A1 between the first locking parts 11 is set smaller than the diameter D of the cylindrical roller 3, and the facing distance A2 between the second locking parts 12 is It is set to be smaller than the diameter D of the cylindrical roller 3 and larger than the facing distance A1 between the first locking portions 11.
Further, the pitch circle radius Ri of the cylindrical roller 3 in a state where the cylindrical roller 3 in the pocket 5 is in contact with the first stopper 11, and the cylindrical roller in a state in which the cylindrical roller 3 in the pocket 5 is in contact with the raceway 1 a of the outer ring 1. 3 is equal to or greater than the height h in the radial direction of the flange portions 1b and 1c of the outer ring 1.

  The pair of inner wall surfaces 10 facing each other in the circumferential direction of the pocket 5 in the cage 4 does not have a radial undercut shape when viewed from the outer diameter side. Generally, a resin cage for a cylindrical roller bearing is formed by inserting and removing a pocket forming die (pin) from the outer diameter side of the cage to process the pocket. For this reason, if the inner wall surface 10 of the pocket 5 does not have an undercut shape like the cage 4, it is not necessary to use a complicated mold, and it is easy to control the operation of the mold. A resin cage can be manufactured.

  Although each said embodiment has shown the cylindrical roller bearing whose outer ring | wheel is a ring ring with both collars, this invention is applicable also to the cylindrical roller bearing whose inner ring is a ring ring with both collars.

(A) is sectional drawing except the inner ring | wheel of the cylindrical roller bearing concerning 1st Embodiment of this invention, (B) is the IB part enlarged view, (C) is the IB part enlarged view which shows a different state. It is the figure which combined the fracture | rupture perspective view of the intermediate assembly of the cylindrical roller bearing, and the perspective view of an inner ring | wheel. (A) is sectional drawing except the inner ring | wheel of the cylindrical roller bearing concerning 2nd Embodiment of this invention, (B) is the IIIB part enlarged view, (C) is the IIIB part enlarged view which shows a different state. It is a perspective view of the holder of the cylindrical roller bearing. (A) is sectional drawing except the inner ring | wheel of the conventional cylindrical roller bearing, (B) is the VB part enlarged view. It is a perspective view of the holder of the cylindrical roller bearing.

Explanation of symbols

1 ... Outer ring (Ring with ring)
DESCRIPTION OF SYMBOLS 1a ... Track 1b, 1c ... Collar part 2 ... Inner ring 2a ... Track 2b ... Collar part 2c ... Lead in chamfer 3 ... Cylindrical roller 4 ... Cage 5 ... Pocket 4 ... Elastic body 5 ... Housing 10 ... Inner wall surface 11 ... First The second locking part 12 ... the second locking part 13 ... the intermediate assembly A1 ... the facing distance A2 between the pair of first locking parts ... The facing distance between the pair of second locking parts

Claims (6)

An inner ring having a raceway on the outer peripheral surface, an outer ring having a raceway on the inner peripheral surface, a plurality of cylindrical rollers which are freely rollable between the races of the inner ring and the outer ring, which are raceways, and each cylindrical roller A retainer that is spaced apart in the circumferential direction and that is rotatably supported;
One of the inner ring and the outer ring is a ring ring with a double collar having a flange portion projecting in a radial direction toward the other track ring at both ends in the axial direction, and the cage has a plurality of openings that are open on both sides in the radial direction. The cylindrical rollers are held one by one in the pocket, and the opposing distance between the pockets on the opening edge on the opposite side of the raceway with the flanges on the pair of inner wall surfaces facing each other in the circumferential direction. Is provided with a first locking portion smaller than the diameter of the cylindrical roller, the pitch circle radius of the cylindrical roller in a state where the cylindrical roller is in contact with the first locking portion in each pocket, and the cylinder in each pocket. A state in which the cylindrical roller is held by setting the difference between the pitch circle radius of the cylindrical roller in a state where the roller is in contact with the both-ring raceway ring to be equal to or greater than the height in the radial direction of the both-ring-bearing ring collar portion. Of the above In the lifting device cylindrical roller bearing in which the detachable to said two flanged bearing rings,
The distance between the pockets is smaller than the diameter of the cylindrical roller at a position closer to the two raceways with the flanges than the first locking part on the pair of inner wall surfaces facing each other in the circumferential direction of the pocket, and A cylindrical roller bearing characterized in that a second locking part larger than the opposing distance of the first locking part is provided.   2. The cylindrical roller bearing according to claim 1, wherein an opposing distance of the second stopper part is a dimension that allows the cylindrical roller to pass by elastically deforming a cage. 3.   3. The bearing ring of claim 1 or 2, wherein the inner ring and the outer ring, which are not provided with both flanges, have a flange portion projecting in a radial direction toward the bearing ring with both flanges at one end in the axial direction, and a lead at the other end. Cylindrical roller bearing with inchanfa formed.   The cylindrical roller bearing according to any one of claims 1 to 3, wherein the flanged bearing ring is an outer ring.   5. The pair of inner wall surfaces of the pockets facing each other in the circumferential direction according to claim 1, wherein the center faces both axial directions and the center positions are separated from each other in the radial direction. A cylindrical roller bearing which is formed of partial cylindrical surfaces, and a boundary portion between the two partial cylindrical surfaces serves as the second retaining portion.   The pair of inner wall surfaces facing each other in the circumferential direction of the pockets according to any one of claims 1 to 4 are flat surfaces that are parallel to each other except for a part thereof. And forming a projecting portion in which the circumferential projecting amount gradually increases as the distance from the both raceway ring is increased, and a portion of the projecting portion on the opposite side of the both raceway ring is the second detent portion. A cylindrical roller bearing in which the portion on the side of the raceway with both collars is the second retaining portion.

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