Sealing type rolling bearing

Abstract

To provide a sealing type rolling bearing for preventing a seal body from falling off a bearing or rolling together therewith in a simple and inexpensive construction, even when continuously used in severe high-temperature or high-load environments.SOLUTION: A sealing type rolling bearing includes an outer ring, an inner ring, a plurality of rolling elements, and a seal body mounted to a seal holder fitting surface provided at the outside end of the inner diameter part of the outer ring, the seal body including a sectionally L-shaped core metal having a core metal cylindrical part and a core metal circular ring part, a seal member formed of an elastic material having a seal fixed part and a seal lip part mounted to the core metal and closely attached to the seal holder fitting surface, the seal holder fitting surface including a first lock recessed part, and the seal fixed part having a first lock piece to be locked to the first lock recessed part.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a sealed rolling bearing, and more particularly to a sealed rolling bearing used, for example, in a pallet cart in a sintering facility. [Background technology]

[0002] Sintering equipment is located in the front-end of steelworks, where powdered iron ore, the raw material for steel products, powdered coke, the fuel, and powdered lime, the flux, are loaded onto a cart called a pallet and baked to the size of the pallet. The baked sintered ore is then crushed to the optimum size required for the next process.

[0003] The rolling bearing device used to support the axles of the pallet cart that transports sintering raw materials into the sintering facility is configured so that the axles of the pallet cart are supported by rolling bearings housed in a bearing housing. Because such rolling bearing devices are used in high-temperature environments of 800°C or higher, large amounts of cooling water are sprayed onto them.

[0004] Seals are used in bearing housings to prevent dust and cooling water from entering the bearings in sintering equipment. However, if dust or cooling water enters the bearings due to a high-temperature environment, foreign matter such as scale, or improper maintenance, poor lubrication can occur, potentially leading to early damage to the bearings.

[0005] Patent Document 1 discloses a sealed rolling bearing that includes an annular core bar that is attached to a step provided on the outer peripheral surface of the inner ring or the inner peripheral surface of the outer ring, a sealing member that includes an elastic member that covers the core bar, and a retaining member that is attached to an annular groove provided close to the peripheral surface of the step. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-205442 Summary of the Invention [Problem to be solved by the invention]

[0007] The seal body described in Patent Document 1 is intended to improve maintainability by facilitating removal of the seal member, but because bearings used in pallet trucks and the like are used in harsh environments with high temperatures and heavy loads, there is a risk that the seal body may fall off the bearing or rotate with it in a short period of time due to deformation of the outer ring that serves as the seal holder, increased internal pressure in the bearing, continuous impact and vibration, etc. Furthermore, the seal body has a complex structure, which makes it costly to manufacture.

[0008] The present invention has been made in view of the above-mentioned problems, and aims to provide a sealed rolling bearing that has a simple, low-cost configuration and prevents the seal body from falling off the bearing or rotating with the bearing, even when used continuously in harsh environments such as high temperatures and heavy loads. [Means for solving the problem]

[0009] The above object of the present invention is achieved by the following configuration [1]. [1] An outer ring having an outer ring raceway formed on its inner diameter portion; an inner ring having an inner ring raceway surface formed on an outer diameter portion thereof; a plurality of rolling elements disposed between the outer ring raceway surface and the inner ring raceway surface; a seal body attached to a seal holder fitting surface provided on an outer end of an inner diameter portion of the outer ring, and sealing a gap formed between the outer ring and the inner ring; A sealed rolling bearing comprising: the seal body comprises a core metal having an L-shaped cross section, the core metal having a cylindrical portion and a circular core metal portion bent from an inner end of the cylindrical core metal portion toward the inner ring, and a seal member made of an elastic material, the seal member having a seal fixing portion attached to the core metal and in close contact with the seal holder fitting surface, and a seal lip portion, the seal holder fitting surface includes a first locking recess having a bottom portion extending in an axial direction and an edge portion rising in a radial direction from the bottom portion; The seal fixing portion has a first locking piece that protrudes radially and is locked in the first locking recess. Sealed rolling bearing. [Effects of the Invention]

[0010] According to the present invention, a simple and low-cost configuration can prevent the seal body from falling off the bearing or rotating with the bearing, even when the bearing is used continuously in a harsh environment such as high temperature and high load. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a schematic perspective view of a sintering facility to which the present invention is applied. [Figure 2] FIG. 2 is a cross-sectional view showing a running portion of the pallet truck. [Figure 3] FIG. 3 is an enlarged view of the main part of the sealing device. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be specifically described. However, the present invention is not limited to the embodiments described below. Fig. 1 is a schematic perspective view of a sintering facility to which the present invention is applied. Fig. 2 is a cross-sectional view showing a running part of a pallet cart. As shown in FIG. 1, the sintering equipment 10 includes a pallet cart 11, a circular rail 12 on which the pallet cart 11 runs, a drive sprocket 13 and a driven sprocket 14 arranged at both ends of the rail 12, and an ignition furnace (not shown).

[0013] The pallet cart 11 has a pallet 11a that stores iron ore and limestone, which are raw materials for sintering, and a running part 11b that is provided below the pallet 11a.

[0014] The running portion 11 b of the pallet truck 11 has an axle 15 , running rollers 16 , a tapered roller bearing 20 , a cylindrical roller bearing 30 , a bearing retainer plate 18 , and a front cover 19 . The tapered roller bearing 20 is a bearing for the traveling roller 16 fixed to the shaft end of the axle 15 . Cylindrical roller bearing 30 is a bearing for a middle roller, located near running roller 16, and arranged in parallel in the axial direction together with tapered roller bearing 20 via inner ring spacer 17. This configuration can be seen in FIG. Furthermore, each of the two parallel rails 12 on which the running rollers 16 roll is loop-shaped, more specifically, has a shape that is roughly like a land track, with a pair of upper and lower straight sections extending horizontally and a curved section in the upper and lower directions connecting the ends of the pair of upper and lower straight sections.

[0015] The plurality of pallet trucks 11 are connected in a ring shape and are wound around a driving sprocket 13 and a driven sprocket 14. The pallet truck 11 carries sintered powder while traveling on the vertically upper straight portion of the rail 12, then engages the driven sprocket 14 with the outer surface of the outer ring 31 of the cylindrical roller bearing 30 as the middle roller, and travels down to the vertically lower straight portion via one curved portion. After traveling in the reverse direction on the lower straight portion of the rail 12, the upside-down pallet truck 11 engages the drive sprocket 13 with the outer surface of the outer ring 31 of the cylindrical roller bearing 30 as the middle roller, and is lifted vertically upward by this drive sprocket 13, thereby traveling on the other curved portion of the rail 12. The pallet truck 11 then travels again on the vertically upper straight portion 12A. As a result, the pallet cart 11 moves circulatingly on the rail 12 at a low speed. Furthermore, the outer ring 31 of the cylindrical roller bearing 30 is prone to continuous vibration and load, and in particular, when it is lifted from a vertically lower rail 12 to a vertically upper rail 12, the drive sprocket 13 engages with it and a large load is applied.

[0016] The ignition furnace is provided corresponding to the upper pallet cart 11 between the driving sprocket 13 and the driven sprocket 14, and heats and sinters the raw materials stored in the pallet cart 11. The sintered ore sintered in the pallet cart 11 is discharged from the pallet cart 11 when it tilts along the driven sprocket 14, as shown in FIG. 1. For this reason, the pallet cart 11 operates in a high-temperature environment.

[0017] As shown in FIG. 2, the tapered roller bearing 20 has an outer ring 21, an inner ring 22, tapered rollers 23 which are rolling elements, a cage 25, and a seal body 26. The inner ring 22 has tapered inner ring raceway surfaces 22a, and two of them are arranged side by side in the axial direction. The outer ring 21 has a pair of inner ring raceway surfaces 22a and two tapered outer ring raceway surfaces 21a facing each other.

[0018] In tapered roller bearing 20, the gap between inner rings 22, 22 is sealed by seal bodies 26 fixed to the inner circumferential surfaces at both ends of outer ring 21, and grease is filled in advance in the space between the inner and outer rings. Tapered roller bearing 20 of this embodiment is a bearing with an inner ring inner diameter of 50 mm or more, an outer ring outer diameter of 100 mm or more, and a width of 50 mm or more.

[0019] As shown in Figure 2, cylindrical roller bearing 30 has an outer ring 31 used as a middle roller whose outer peripheral surface engages with each of sprockets 13, 14, an inner ring 32, cylindrical rollers 33 which are rolling elements, and a sealing device 35 which seals the space formed between outer ring 31 and inner ring 32.

[0020] The outer ring 31 has outer ring raceway surfaces 31a formed on both sides of a protrusion 31b provided in the widthwise center of the inner diameter portion. The outer ring 31 also has seal holder fitting surfaces 40, 40 formed by cutting out the outer side of the outer ring raceway surface 31a in the widthwise direction.

[0021] The inner ring 32 has an inner ring raceway surface 32a in which an outer diameter portion facing the outer ring raceway surface 31a is recessed, and two inner rings 32 are arranged side by side in the axial direction along the outer ring 31. A convex portion 32b that protrudes radially outward toward the convex portion 31b of the outer ring 31 is formed on one widthwise side of the inner ring raceway surface 32a. A sliding surface 61 and a slinger fitting surface 60 are formed on the other widthwise side of the inner ring raceway surface 32a at a position facing the seal holder fitting surface 40.

[0022] The cylindrical rollers 33 are aligned in two rows and interposed between the outer ring raceway surface 31 a and the inner ring raceway surface 32 a so as to be able to roll freely. The inner end faces of the cylindrical rollers 33 come into contact with the side faces of the protrusions 31 b, 32 b formed on the outer ring 31 and the inner ring 32, restricting their movement in directions toward each other.

[0023] (Sealing device 35) Next, a specific configuration of the sealing device 35 will be described with reference to Fig. 3. Fig. 3 is an enlarged view of the main part of the sealing device. The seal device 35 has a seal body 50 formed from an elastic member and fitted to the seal holder fitting surface 40, and a slinger 70 formed from a metal member and fitted to the slinger fitting surface 60.

[0024] (Seal holder mating surface 40) The seal holder fitting surface 40 is provided at the outer end of the inner diameter portion of the outer ring 21. The seal holder fitting surface 40 has a larger diameter than the outer ring raceway surface 31a, and forms a step 42 between itself and the outer ring raceway surface 31a. The seal holder fitting surface 40 also has a first locking recess 43 formed outward in the width direction, and a ground relief groove 44 formed at the inner end.

[0025] The first locking recess 43 is a groove formed by recessing the seal holder fitting surface 40, and is formed in an annular shape. The first locking recess 43 has a bottom 43a extending in the axial direction and a pair of edge portions 43b rising in the radial direction from both axial ends of the bottom 43a. In this embodiment, the edge portions 43b are perpendicular to the axial ends of the bottom 43a. In this embodiment, the first locking recess 43 is provided on the outer side of the seal holder fitting surface 40 in the width direction, but it may also be positioned in the center of the seal holder fitting surface 40 in the width direction, or closer to the grinding clearance groove 44. Furthermore, the width of the first locking recess 43 (bottom 43a) is formed to be approximately the same as that of the grinding clearance groove 44, but it may be formed wider or narrower as long as the first locking piece 59 of the sealing body 50 described later can be locked within the first locking recess 43.

[0026] (Seal body 50) The seal body 50 has a core metal 51 made of a metal member and a seal member 52 made of an elastic member.

[0027] The core 51 is a metal member formed in a ring shape along the seal holder fitting surface 40, and has a core cylindrical portion 51a formed along the inside of the seal holder fitting surface 40, and a core circular ring portion 51b bent from the inner end of the core cylindrical portion 51a toward the inner ring 32, and is formed with an L-shaped cross section. The core metal cylindrical portion 51a extends in the axial direction along the seal holder fitting surface 40, and is inclined so that its diameter increases from the axially inner side where the core metal ring portion 51b is provided toward the axially outer side. The core metal ring portion 51b is formed along the step portion 42 of the seal holder fitting surface 40.

[0028] The seal member 52 has a seal fixing portion 53 that covers the outer diameter portion of the core metal cylindrical portion 51a and is in close contact with the seal holder fitting surface 40, an inner wall portion 55 that continues from the seal fixing portion 53 and covers the inside of the core metal annular portion 51b, and a seal lip portion 54. This configuration can be seen in Figure 3. In the example shown, the inner wall portion 55 is spaced apart from the step portion 42 of the seal holder fitting surface 40, but it may also be in close contact with the step portion 42.

[0029] The seal fixing portion 53 is fixed to the entire outer peripheral surface of the core cylindrical portion 51 a. As a result, when the seal body 50 is pressed into the seal holder fitting surface 40, the seal fixing portion 53 is pressed against the seal holder fitting surface 40 and elastically deforms, so that the seal body 50 is firmly fitted to the seal holder fitting surface 40. The interference between the seal fixing portion 53 and the seal holder fitting surface 40 is set to 87 to 400 μm.

[0030] A first locking piece 59 that can be locked in the first locking recess 43 is provided on the axially outer side of the outer peripheral surface of the seal fixing portion 53. This configuration can be seen in FIG. The first locking piece 59 is an annular protrusion having an inclined surface 59a that increases in diameter from the inside to the outside in the width direction, and a stepped surface 59b that connects from the outer end of the inclined surface 59a to the seal fixing part 53. The seal fixing part 53 has a notch 58 formed in the first locking piece 59 at the connection portion with the stepped surface 59b. 3, the first locking pieces 59 are provided on the outer diameter side of the outer end of the cylindrical core portion 51a, which is inclined in the radially expanding direction toward the axially outward direction. Therefore, when the cylindrical core portion 51a locks the first locking pieces 59 in the first locking recesses 43, the movement of the first locking pieces 59, which elastically deform in the radial direction, can be supported by the cylindrical core portion 51a. The first locking pieces 59 may be provided in an annular shape along the first locking recess 43, or may be provided intermittently in the circumferential direction along the first locking recess 43.

[0031] The seal lip portion 54 has a first lip portion 54a that extends radially inward from the inner wall portion 55 and comes into sliding contact with the sliding surface 61 of the inner ring 32, and a second lip portion 54b that extends continuously from the first lip portion 54a from the core metal ring portion 51b toward the axially outward side and thereby comes into sliding contact with the slinger 70.

[0032] (Slinger mating surface 60) The slinger fitting surface 60 is disposed at the axial end of the outer diameter portion of the inner ring 32, and is disposed axially outward of a sliding contact surface 61 with which the first lip portion 54a slides. The slinger fitting surface 60 is disposed axially outward of the sliding contact surface 61 via a step portion 62, and is formed with a smaller diameter than the sliding contact surface 61. The inner end of the slinger fitting surface 60 is formed with a second locking recess 63 in which the slinger 70 is locked.

[0033] The second locking recess 63 is a groove formed by recessing the slinger fitting surface 60, and is formed in an annular shape. The second locking recess 63 is formed with a bottom 63a extending in the axial direction and an edge 63b rising in the radial direction from one axial end of the bottom 63a, and a step 62 is connected to the other axial end of the bottom 63a. In this embodiment, the edge 63b and the step 62 are perpendicular to the axial end of the bottom 63a.

[0034] (Slinger 70) The slinger 70 is a metal member having a slinger cylindrical portion 70a formed in a ring shape along the slinger fitting surface 60, and a slinger circular ring portion 70b bent from the inner end of the slinger cylindrical portion 70a toward the outer ring 31, and is formed with an L-shaped cross section. The inner end of the slinger cylindrical portion 70 a abuts against the step portion 62 and is provided with a second locking piece 73 that is locked in the second locking recess 63 . The second lip portion 54b is in sliding contact with the axially inner surface of the slinger ring portion 70b.

[0035] The second locking piece 73 is an annular protrusion having a stepped surface 73a that connects from its outer end to the slinger cylindrical portion 70a. The stepped surface 73a is configured to hook onto the edge 63b of the second locking recess 63. The second locking pieces 73 may be provided in an annular shape along the second locking recess 63, or may be provided intermittently in the circumferential direction along the second locking recess 63.

[0036] (Action and effect) According to the above-described configuration, the sealing device 35 can seal the gap formed between the outer ring 31 and the inner ring 32 with a simple configuration. This makes it possible to efficiently prevent lubricating oil from leaking from inside the cylindrical roller bearing 30. Furthermore, even when a large amount of cooling water is sprayed to cool the cylindrical roller bearing 30, it is possible to efficiently prevent the cooling water from entering the interior of the cylindrical roller bearing 30. A similar sealing device 35 may also be provided in the tapered roller bearing 20.

[0037] Furthermore, step surface 59b of first locking piece 59 catches on edge 43b of first locking recess 43, thereby locking seal body 50 to seal holder fitting surface 40. For this reason, even if outer ring 31 is deformed, the internal pressure of cylindrical roller bearing 30 increases, or cylindrical roller bearing 30 is subjected to continuous impact, vibration, or the like due to continuous use in a harsh environment such as sintering equipment, seal body 50 can be prevented from slipping out of seal holder fitting surface 40 or from rotating entrained therewith.

[0038] Furthermore, when the seal body 50 is fitted to the seal holder fitting surface 40 while elastically deforming the first locking piece 59, the first locking piece 59 is smoothly elastically deformed by the inclined surface 59a. At this time, the first locking piece 59 is elastically deformed more smoothly by the notch 58 formed between the step surface 59b of the first locking piece 59 and the seal fixing portion 53. Therefore, the seal body 50 can be smoothly attached to the seal holder fitting surface 40, while the seal body 50 can be firmly prevented from slipping out of the seal holder fitting surface 40.

[0039] Furthermore, the first locking pieces 59 are provided on the outer diameter portion of the outer end of the cylindrical core portion 51a, which expands in diameter outward in the axial direction. This allows the radial movement of the first locking pieces 59 to be supported by the elastic deformation of the cylindrical core portion 51a, which is inclined toward the first locking recess 43, making it more difficult for the seal body 50 to come off the seal holder fitting surface 40.

[0040] In addition, by providing the slinger 70, a labyrinth is formed between the radially outer end of the slinger ring portion 70b and the axially outer side of the seal fixing portion 53, and between the slinger ring portion 70b and the core metal ring portion 51b. Furthermore, the seal lip portion 54 is in sliding contact with the slinger ring portion 70b, with which the second lip portion 54b comes into contact, and the sliding contact surface 61, with which the first lip portion 54a comes into contact. As a result, the seal lip portion 54 is in sliding contact with two surfaces, the radial surface and the axial surface, thereby further improving the sealing performance of the seal body 50.

[0041] The present invention is not limited to the above-described embodiment, and modifications and improvements can be made as appropriate.

[0042] As described above, the present specification discloses the following: (1) an outer ring having an outer ring raceway formed on its inner diameter; an inner ring having an inner ring raceway surface formed on an outer diameter portion thereof; a plurality of rolling elements disposed between the outer ring raceway surface and the inner ring raceway surface; a seal body attached to a seal holder fitting surface provided on an outer end of an inner diameter portion of the outer ring, and sealing a gap formed between the outer ring and the inner ring; A sealed rolling bearing comprising: the seal body comprises a core metal having an L-shaped cross section, the core metal having a cylindrical portion and a circular core metal portion bent from an inner end of the cylindrical core metal portion toward the inner ring, and a seal member made of an elastic material, the seal member having a seal fixing portion attached to the core metal and in close contact with the seal holder fitting surface, and a seal lip portion, the seal holder fitting surface includes a first locking recess having a bottom portion extending in an axial direction and an edge portion rising in a radial direction from the bottom portion; The seal fixing portion has a first locking piece that protrudes radially and is locked in the first locking recess. Sealed rolling bearing. According to this configuration, the simple and low-cost configuration can prevent the seal body from falling off the bearing or rotating with the bearing, even when used continuously in harsh environments such as high temperatures and heavy loads.

[0043] (2) The core metal cylindrical portion is disposed radially inside the first locking piece. (1) A sealed rolling bearing according to the present invention. According to this configuration, the radial movement of the first locking piece can be supported by the core metal.

[0044] (3) The first locking recess and the first locking piece are disposed axially outward of the seal holder fitting surface, The first locking piece is disposed on the outer diameter side of the outer end of the cylindrical core portion. A sealed rolling bearing according to (1) or (2). According to this configuration, the seal body can be easily attached to the seal holder fitting surface, while the seal body is less likely to come off from the seal holder fitting surface.

[0045] (4) The first locking piece has an inclined surface that expands in diameter from the inside to the outside in the width direction, and a stepped surface that connects from an outer end of the inclined surface to the seal fixing portion, A notch is formed at a portion where the seal fixing portion is connected to the stepped surface. The sealed rolling bearing according to any one of (1) to (3). According to this configuration, when the seal body is pressed into the seal holder fitting surface, the first locking piece elastically deforms more smoothly.

[0046] (5) A slinger with which the seal lip portion slides is provided on the outer diameter portion of the inner ring, The slinger is formed with an L-shaped cross section having a slinger cylindrical portion attached to a slinger fitting surface provided at the outer end of the outer diameter portion of the inner ring, and a slinger circular ring portion bent from the outer end of the slinger cylindrical portion toward the outer ring, The seal lip portion abuts against the slinger ring portion. The sealed rolling bearing according to any one of (1) to (4). According to this configuration, the provision of a slinger with which the seal lip portion slides improves the sealing performance of the bearing.

[0047] (6) The slinger fitting surface includes a second locking recess having a bottom portion extending in the axial direction and an edge portion rising in the radial direction from the bottom portion, The slinger has a second locking piece that protrudes radially inward and is locked in the second locking recess. (5) A sealed rolling bearing according to the present invention. According to this configuration, the slinger is less likely to come off from the inner ring side. [Explanation of symbols]

[0048] 10 Sintering equipment 11 Pallet cart 11a Palette 11b Running part 12 Rail 13 Drive sprocket 14 driven sprocket 15 axles 16 Traveling roller 17 Inner ring spacer 18 Bearing retainer plate 19 Front lid 20 Tapered roller bearing 21 outer ring 21a Outer ring raceway 22 Inner Circle 22a Inner ring raceway surface 25 Retainer 26 Seal body 30 Cylindrical roller bearing 31 outer ring 31a Outer ring raceway 31b Convex part 32 Inner circle 32a Inner ring raceway surface 32b Convex part 35 Sealing device 40 Seal holder mating surface 42 Stepped section 43 First locking recess 43a bottom 43b Edge 44 Grinding undercut groove 50 Seal body 51 Core 51a Core cylindrical part 51b Core metal ring part 52 Sealing material 53 Seal fixing part 54 Seal lip 54a First lip 54b Second lip 55 Inner wall 58 Notch 59 1st locking piece 59a Slope 59b Step surface 60 Slinger mating surface 61 Sliding surface 62 Step part 63 Second locking recess 63a bottom 63b Edge 70 Slinger 70a Slinger cylindrical part 70b Slinger ring part 73 Second locking piece 73a Step surface

Claims

1. an outer ring having an outer ring raceway surface formed on an inner diameter portion; an inner ring having an inner ring raceway surface formed on an outer diameter portion thereof; a plurality of rolling elements disposed between the outer ring raceway surface and the inner ring raceway surface; a seal body attached to a seal holder fitting surface provided on an outer end of an inner diameter portion of the outer ring, and sealing a gap formed between the outer ring and the inner ring; A sealed rolling bearing comprising: the seal body comprises a core metal having an L-shaped cross section, the core metal having a cylindrical portion and a circular core metal portion bent from an inner end of the cylindrical core metal portion toward the inner ring, and a seal member made of an elastic material, the seal member having a seal fixing portion attached to the core metal and in close contact with the seal holder fitting surface, and a seal lip portion, the seal holder fitting surface includes a first locking recess having a bottom portion extending in an axial direction and an edge portion rising in a radial direction from the bottom portion, The seal fixing portion has a first locking piece that protrudes in a radial direction and is locked in the first locking recess. Sealed rolling bearing.

2. The core metal cylindrical portion is disposed radially inside the first locking piece.

2. A sealed rolling bearing according to claim 1.

3. the first locking recess and the first locking piece are disposed axially outward of the seal holder fitting surface, The first locking piece is disposed on the outer diameter side of the outer end of the cylindrical core portion.

3. A sealed rolling bearing according to claim 2.

4. the first locking piece has an inclined surface that increases in diameter from the inside toward the outside in the width direction, and a stepped surface that connects from an outer end of the inclined surface to the seal fixing portion, A notch is formed at a portion where the seal fixing portion is connected to the stepped surface.

2. A sealed rolling bearing according to claim 1.

5. a slinger with which the seal lip portion slides is provided on an outer diameter portion of the inner ring, The slinger is formed in an L-shaped cross section, having a slinger cylindrical portion attached to a slinger fitting surface provided at the outer end of the outer diameter portion of the inner ring, and a slinger circular ring portion bent from the outer end of the slinger cylindrical portion toward the outer ring, The seal lip portion abuts against the slinger ring portion. A sealed rolling bearing according to any one of claims 1 to 4.

6. The slinger fitting surface includes a second locking recess having a bottom portion extending in an axial direction and an edge portion rising in a radial direction from the bottom portion, The slinger has a second locking piece that protrudes radially inward and is locked in the second locking recess.

6. A sealed rolling bearing according to claim 5.

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