JP2017172614A - Roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller bearing facilitating its fixing to a bearing ring and capable of preventing damage and dropping of a roller by devising a width and a shape of a slit at a snap ring.SOLUTION: This invention relates to a roller bearing comprising an inner ring 22, an outer ring, several rollers 23 arranged between the inner ring and the outer ring and formed with a pair of end surfaces at both ends of an axial line direction, a snap ring groove 22b arrange at any one of the inner ring and the outer ring, and a snap ring 24 fitted into the snap ring groove. The snap ring has a slit 24a at a portion of at least outside in a radial direction of the snap ring groove while being inclined in respect to the radial direction of the snap ring and a width of the slit is set to be substantially equal to a length of chord at a roller end surface when an end surface at a side where it is not engaged with the snap ring groove traverses the opposing roller end surface.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a roller bearing, and more particularly to a roller bearing used in general industrial machines, steel, construction machines, and the like.

  In the case of roller bearings used in general industrial machinery, steel, construction machinery, etc., when the applied load is large, to increase the load capacity of the bearing even if the outer diameter, inner diameter, and width of the bearing are the same due to restrictions on the structure around the bearing A full-roller type roller bearing is used in which the cage is eliminated and the number of rollers is increased.

  FIG. 5 shows a continuous casting facility as an example to which a conventionally known full roller type roller bearing is applied. In this continuous casting facility, the molten steel in the ladle 101 is fed in the order of the tundish 102 and the mold (mold) 103, and the slab FE that has started to solidify in the mold 103 is fed between the guide rolls 104. . Immediately below the mold 103, the slab FE is cooled to promote solidification.

  FIG. 6 is a cross-sectional view showing a configuration of a guide roll 104 used in such a continuous casting facility and a bearing device 110 that supports the guide roll 104. The same bearing devices 110 and 110 are reversed and used. Therefore, the explanation will proceed mainly on the left bearing. The guide roll 104 has a first cylindrical portion 104b, a second cylindrical portion 104c, which are smaller in diameter than the rolled portion 104a and coaxially arranged on both sides in the axial direction of the rolled portion 104a for rolling the slab FE (see FIG. 5). The third cylindrical portion 104d is provided in this order from the rolling portion 104a side.

  A cylindrical portion 111a and a seal holding portion 111b are coaxially formed inside the housing main body 111 whose lower surface is fixed to the base 105. A cylindrical roller bearing 120 is disposed in the cylindrical portion 111a. A seal 113 is disposed on the seal holding portion 111b, and the lip of the seal 113 is in contact with the outer periphery of the labyrinth ring 114 fitted to the first cylindrical portion 104b for sealing. The labyrinth ring 114 has a substantially U-shaped circumferential cross section, and forms a labyrinth seal as a non-contact seal by being combined with a correspondingly shaped housing body 111 with a minute gap.

  An annular member 115 is fitted and disposed on the outer periphery of the third cylindrical portion 104d of the housing body 111 so as to abut against the end surface of the second cylindrical portion 104c and is fixed by a bolt B. The inner ring 122 of the cylindrical roller bearing 120 is sandwiched between the end surface of the first cylindrical portion 104 b and the annular member 115, and is fixed so as to rotate integrally with the guide roll 104. Note that a structure may be employed in which clearance is slightly provided between the end surfaces of the annular member 115 and the inner ring 122 due to the mounting accuracy of the housing.

  A donut plate-like lid member 116 is attached to the housing main body 111 using bolts B, and the outer ring 121 is fixed to the housing main body 111. A seal 117 disposed in the central opening of the lid member 116 abuts on the annular member 115 and seals it. The housing body 111 and the lid member 116 constitute a housing. The lubrication uses grease lubrication or oil-air lubrication.

  Such cylindrical roller bearings (hereinafter also simply referred to as “roller bearings”) guide the cylindrical rollers in the circumferential direction with an annular collar provided at the end of the inner ring or outer ring. In order to allow disassembly, at least one end of the both ends of the inner and outer rings has no collar (in the example of FIG. 6, the inner ring 122 has no collar).

  However, the cylindrical roller (hereinafter also simply referred to as “roller”) falls off when the inner ring or outer ring, which is the raceway, comes off without the collar, so the inner ring 122 of the inner ring 122 that has no collar in the example of FIG. A circumferentially continuous mounting groove is provided on the peripheral surface of the end, and a C-shaped retaining ring 124 is mounted in this groove. The retaining ring 124 prevents the cylindrical roller 123 from moving in the axial direction of the raceway ring and prevents the cylindrical roller 123 from falling off (see also Patent Document 1).

  Fig.7 (a) is sectional drawing of the roller bearing with a full roller type described in patent document 1, The same (b) is DD sectional drawing of Fig.7 (a). The retaining ring 224 is reduced in diameter and moved in the axial direction along the inner peripheral surface of the outer ring 221, and then the diameter of the retaining ring 224 is expanded by a spring back at the position of the groove 221a formed in the outer ring 221, and fitted into the groove 221a and fixed. Is done. FIG. 7 shows an example in which the retaining ring 224 is fixed to the outer ring 221, but when the retaining ring is fixed to the inner ring 222, the retaining ring is first expanded in diameter and then reduced in diameter by a springback at the groove position. Then fit and fix in the groove.

JP 9-177770 A

  As described above, the retaining ring is formed with the slit 224a for enabling the diameter to be reduced or increased. However, the smaller the width of the slit 224a is, the more difficult it is to be deformed, so that the mounting on the raceway is difficult. On the contrary, the larger the width of the slit 224a is, the easier it is to deform. Is easy, but allows the roller to move in the axial direction, which may lead to damage or dropout of the roller.

  The present invention has been made in view of the above circumstances, and by devising the width and shape of the slit of the retaining ring, the material cost can be reduced and the weight can be reduced. It is an object of the present invention to provide a roller bearing that can be easily mounted on a roller and can prevent the roller from being damaged or dropped off.

In order to solve the above problems, a roller bearing according to the present invention is configured as follows.
Inner ring,
Outer ring,
A plurality of rollers provided between the inner ring and the outer ring and having a pair of end faces formed at both axial ends;
A retaining ring groove provided on either the inner ring or the outer ring;
A retaining ring that fits into the retaining ring groove;
In roller bearings having
The retaining ring has a slit extending at an angle with respect to the radial direction of the retaining ring at least at a portion radially outside the retaining ring groove, and the width of the slit is engaged with the retaining ring groove. A roller bearing characterized in that it has a size approximately equal to the length of the chord of the roller end face when the end face on the non-side crosses the opposite roller end face.

  According to the present invention, the width of the slit of the retaining ring is approximately equal to the length of the chord of the roller end surface when the end surface on the side not engaged with the retaining ring groove crosses the opposing roller end surface. This facilitates the reduction or expansion of the retaining ring and facilitates attachment to the race. In addition, since the slit having such a width extends while being inclined with respect to the radial direction of the retaining ring, it is possible to obtain a roller bearing that can interfere with the roller end face at the slit portion and prevent the roller from being damaged or dropped off. Furthermore, by having the above-mentioned slit, the material cost of the retaining ring can be reduced and the weight can be reduced.

It is sectional drawing of the roller bearing which concerns on 1st Embodiment of this invention. It is AA sectional drawing of FIG. It is explanatory drawing of the comparative example of FIG. It is a figure similar to FIG. 2 of the roller bearing which concerns on 2nd Embodiment of this invention. It is a schematic block diagram of the conventional continuous casting equipment. FIG. 6 is a cross-sectional view of a guide roll of the continuous casting facility of FIG. It is explanatory drawing of the conventional roller bearing and a retaining ring.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)

  FIG. 1 is an enlarged view showing the cylindrical roller bearing 20 of the first embodiment. The cylindrical roller bearing 20 is used as a bearing that supports the guide roll 104 (see FIG. 6) of the continuous casting equipment as described above, for example. In FIG. 1, a cylindrical roller bearing 20 includes an outer ring 21 attached to a housing body (not shown), an inner ring 22 fitted in a cylindrical portion of a guide roll (not shown), and an outer ring 21 and an inner ring 22. It comprises a plurality of cylindrical rollers 23 arranged.

  The outer ring 21 is formed integrally with flanges 21a and 21a extending radially inward at both ends in the axial direction so as to sandwich the cylindrical roller 23 therebetween.

  The inner ring 22 has an outer peripheral surface at the center in the axial direction as a raceway surface 22a for the cylindrical roller 23, and a pair of stoppers for engaging with a retaining ring 24 described later on both outer sides in the axial direction of the raceway surface 22a. An annular groove 22b is formed.

  The cylindrical roller 23 has a flat portion 23a at the center in the axial direction, a crowning portion 23b extending from the flat portion 23a in both end directions, and an end surface 23c. In the figure, the crowning portion 23b is exaggerated for easy understanding. The dimension of the cylindrical roller 23 in the axial direction (longitudinal direction) is slightly smaller than the dimension between the pair of flange portions 21 a and 21 a of the outer ring 21.

  The retaining ring 24 is preferably made of spring steel, and as is apparent from FIG. 2, a part of the circumferential direction is cut to form an end ring member having a slit 24a. The retaining ring 24 is fitted and fixed to the retaining ring groove 22b when the inner peripheral end surface 24b (end surface on the retaining ring groove 22b side) engages with the retaining ring groove 22b.

  The slit 24a extends while being inclined with respect to the radial direction of the retaining ring 24 (the direction of the arrow R in FIG. 2). Since the slit 24a is inclined and extended, on the right side of the slit 24a, one end side 24d of the retaining ring 24 interferes with a part of the roller end surface 23c. Such interference prevents the roller 23 from moving in the axial direction (perpendicular to the paper surface in FIG. 2) and prevents the roller 23 from being damaged or dropped off.

  Further, the width W of the slit 24a is such that the outer peripheral side end surface 24c of the retaining ring 24 (the end surface not engaged with the retaining ring groove 22b) traverses the opposing roller end surface 23c. The size is almost equal to the length of. Thereby, since the width | variety of the slit 24a is fully ensured, the diameter reduction or diameter expansion of the retaining ring 24 is easy. The width of the slit is preferably substantially the same in the direction in which the slit extends, but the width must always be the same, that is, the end surface on the one end side of the retaining ring forming the slit and the opposite thereof. It does not have to be parallel to the end surface on the other end side.

  FIG. 3 is a reference explanatory diagram for comparison. Also in this comparative example, the width W ′ of the slit 24a ′ formed in the retaining ring 24 ′ is substantially equal to the chord length of the roller end surface 23c when the outer peripheral end surface 24c ′ crosses the opposing roller end surface 23c. It is said. However, since the slit 24a ′ extends in the radial direction of the retaining ring 24 ′ (the direction indicated by the arrow R in FIG. 3), the roller 24 ′ is a roller on either the one end side 24d ′ or the other end side 24e ′. It is in the state which does not interfere with the end surface 23c. For this reason, there is a possibility that the roller 23 may move in the axial direction during bearing transportation.

  Returning to FIG. 1, when the retaining ring 24 is mounted on the inner ring 22, the retaining ring 24 whose diameter is increased from the side of the inner ring is moved into the retaining ring groove 22 b, and then the retaining ring 24 is reduced in diameter by a springback. Then, it is fitted and fixed to the retaining ring groove 22b.

  As described above, according to the roller bearing 20 according to the present embodiment, the retaining ring 24 can be easily reduced in diameter or expanded, and therefore can be easily attached to the inner ring 22. Further, in the slit 24a portion of the retaining ring 24, the one end side 24d of the retaining ring 24 interferes with the roller end surface 23c, thereby preventing the roller 23 from moving in the axial direction and preventing the roller 23 from being damaged or dropped off. In addition, the material cost of the retaining ring can be reduced and the weight can be reduced.

(Second Embodiment)
FIG. 4 is a view similar to FIG. 2 of the roller bearing 30 of the second embodiment. About the same part as 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. In the present embodiment, among the slits 34a formed in the retaining ring 34, the portion radially outward from the retaining ring groove 22b is the radial direction of the retaining ring 34 (in FIG. 4) as in the first embodiment. The slits are inclined with respect to the direction of the arrow R). However, both end surfaces 34f and 34g in the circumferential direction of the portion of the retaining ring 34 engaged with the retaining ring groove 22b (the portion in the retaining ring groove 22b) extend in the radial direction of the retaining ring 34. With this configuration, the retaining ring 34 can be more reliably attached to the retaining ring groove 22b. Furthermore, also in this embodiment, the same effect as the first embodiment can be obtained.

  It should be noted that the present invention should not be construed as being limited to the above-described embodiment, and of course can be modified or improved as appropriate. For example, the field to which roller bearings are applied is not limited to steel casting equipment, but can also be applied to paper machines and construction machines. Further, the retaining ring may be provided at either one of the inner rings, not at both ends, and a collar may be formed at the other. Furthermore, both collars may be formed on the inner ring, and a retaining ring may be provided on the outer ring. In this case, the end surface of the outer ring that is not engaged with the retaining ring groove is the inner peripheral surface of the retaining ring. Further, the extending direction of the circumferential end surface of the portion engaged with the retaining ring groove of the retaining ring can be appropriately selected without being limited to the extending direction of the slit or the radial direction of the retaining ring.

20, 30 Cylindrical roller bearing 21 Outer ring 22 Inner ring 22b Retaining ring groove 23 Roller 23c Roller end face 24, 34 Retaining ring 24a, 34a Slit

Claims (1)

Inner ring,
Outer ring,
A plurality of rollers provided between the inner ring and the outer ring and having a pair of end faces formed at both axial ends;
A retaining ring groove provided on either the inner ring or the outer ring;
A retaining ring that fits into the retaining ring groove;
In roller bearings having
The retaining ring has a slit extending at an angle with respect to the radial direction of the retaining ring at least at a portion radially outside the retaining ring groove, and the width of the slit is engaged with the retaining ring groove. A roller bearing characterized in that it has a size approximately equal to the length of the chord of the roller end face when the end face on the non-side crosses the opposite roller end face.

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