Rolling bearing device

Abstract

A rolling bearing device is provided with an inner ring (11) that rotates integrally with a pestle roller (3), an outer ring (15), a plurality of rollers (13), a labyrinth ring (31) attached to an axle box (17), and a gasket (32) in sliding contact with the labyrinth ring. The outer periphery of the inner ring is provided with a first seal groove (71) to which the gasket is attached. The first seal groove has a first side surface (66), a second side surface (67), and a groove bottom surface (68). The gasket has: a cylindrical section (40) that is in sliding contact with the labyrinth ring; an elastically deformable biasing section (41) that is provided on the inside of the cylindrical section in the radial direction; a first protruding section (46) that is in continuous contact with the first side surface (71) in the circumferential direction; and a second protruding section (47) that is in continuous contact with the second side surface (72) in the circumferential direction. The biasing section (41) has a plurality of contact sections (42) which are intermittently provided in the circumferential direction and which are in contact with the groove bottom surface.

Description

Technical Field

[0001] The present disclosure relates to a rolling bearing arrangement. Background Art

[0002] Patent document 1 discloses a rolling bearing device including a pestle-shaped roller for a continuous casting machine. The pestle-shaped roller has a small diameter shaft portion and two large diameter portions with a diameter larger than the small diameter shaft portion. In order to install an inner ring of the rolling bearing device on the small diameter shaft portion, the rolling bearing device is configured to have a two-part structure.

[0003] In the case of a continuous casting machine, cooling water and casting scales fall onto the rolling bearing device. In order to prevent cooling water and casting scales from invading the inside of the bearing where multiple rollers of the rolling bearing device are present, a labyrinth ring, a gasket, and an oil seal are used in the rolling bearing device. In the case of the rolling bearing device disclosed in Patent Document 1, the labyrinth ring is mounted on the axle box, and the gasket and the oil seal are mounted on the inner ring. The gasket and the oil seal are in contact with the labyrinth ring.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2017-190835 Summary of the invention

[0007] Problems to be solved by the invention

[0008] After the pestle roller is assembled to the axle box and the rolling bearing, the rolling bearing device is installed on the common table of the casting machine segment. At this time, the rolling bearing device has an assembly error, or the parts of the rolling bearing device are bent due to the heat and load generated by the slab during casting. Therefore, the interference at each position of the circumferential direction of the liner is sometimes different. Therefore, if Figure 8 As shown in FIG. 1 , the gasket 90 has a resin cylinder 91 and a rubber force-applying portion 92 in order to have a followability with respect to the labyrinth ring 100. The resin cylinder 91 is in sliding contact with the labyrinth ring 100. The rubber force-applying portion 92 is continuously provided along the inner circumference of the cylinder 91. The force-applying portion 92 has a convex portion 93 that contacts the groove bottom surface 96 of the sealing groove 95. The convex portion 93 is mainly elastically deformed, so that the gasket 90 has a followability.

[0009] After the rolling bearing device has been used for a long time, when a portion of the force-applying portion 91 is greatly compressed in the radial direction, for example, Figure 8 As shown by the double-dotted line, the convex portion 93 is sometimes bent. In this case, the gasket 90 may not be able to fully follow the gasket 90. If the followability is reduced, the interference of the gasket 90 with respect to the labyrinth ring 100 is reduced, and the sealing performance between the gasket 90 and the labyrinth ring 100 is reduced.

[0010] Therefore, an object of the present disclosure is to provide a rolling bearing device including a pad capable of improving followability.

[0011] Means for solving problems

[0012] The rolling bearing device disclosed in the present invention comprises: pestle roller; axle box; An inner ring, which rotates integrally with the pestle-shaped roller and has an inner ring raceway; an outer ring having an outer ring raceway opposite to the inner ring raceway and mounted on the axle box; A plurality of rollers are arranged between the inner ring raceway and the outer ring raceway; a labyrinth ring mounted on the axle box in a manner radially opposite to the axial end of the inner ring; a gasket mounted on the inner ring and in sliding contact with the labyrinth ring; and An oil seal is mounted on the inner ring and in sliding contact with the labyrinth ring, The pestle-shaped roller includes a small-diameter shaft portion to which the inner ring is mounted and two large-diameter portions having a larger diameter than the small-diameter shaft portion. A first sealing groove in which the gasket is installed and a second sealing groove in which the oil seal is installed are provided on the outer periphery of the inner ring. The first sealing groove comprises: an annular first side surface; an annular second side surface, which is opposite to the first side surface in the axial direction; and a groove bottom surface, which is arranged between the first side surface and the second side surface. The liner has: A cylinder portion, in sliding contact with the labyrinth ring; A force-applying portion, which is arranged radially inward of the cylindrical portion and is elastically deformable; a first protrusion continuously in contact with the first side surface in a circumferential direction; and a second protrusion continuously in contact with the second side surface in the circumferential direction, The urging portion has a plurality of contact portions that are intermittently provided along the circumferential direction and are in contact with the groove bottom surface.

[0013] Effects of the Invention

[0014] According to the rolling bearing device of the present disclosure, the followability of the spacer with respect to the labyrinth ring is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view showing an example of a rolling bearing device.

[0016] Figure 2 Yes means Figure 1A sectional view of a portion of a first axial side of a rolling bearing arrangement is shown.

[0017] Figure 3 It is a cross-sectional view illustrating the gasket and the first seal groove.

[0018] Figure 4 is a cross-sectional view of the gasket.

[0019] Figure 5 This is a cross-sectional view showing a modified example (1) of the gasket.

[0020] Figure 6 This is a cross-sectional view showing a modified example (2) of the gasket.

[0021] Figure 7 This is a cross-sectional view showing a modified example (3) of the gasket.

[0022] Figure 8 is a cross-sectional view of a conventional gasket. DETAILED DESCRIPTION

[0023] <Overview of Embodiments of the Invention Disclosed>

[0024] Hereinafter, embodiments of the present invention will be described by listing them in outline.

[0025] (1) The rolling bearing device of the present disclosure includes: pestle roller; axle box; An inner ring, which rotates integrally with the pestle-shaped roller and has an inner ring raceway; an outer ring having an outer ring raceway opposite to the inner ring raceway and mounted on the axle box; A plurality of rollers are arranged between the inner ring raceway and the outer ring raceway; a labyrinth ring mounted on the axle box in a manner radially opposite to the axial end of the inner ring; a gasket mounted on the inner ring and in sliding contact with the labyrinth ring; and An oil seal is mounted on the inner ring and in sliding contact with the labyrinth ring, The pestle-shaped roller includes a small-diameter shaft portion to which the inner ring is mounted and two large-diameter portions having a larger diameter than the small-diameter shaft portion. A first sealing groove in which the gasket is installed and a second sealing groove in which the oil seal is installed are provided on the outer periphery of the inner ring. The first sealing groove comprises: an annular first side surface; an annular second side surface, which is opposite to the first side surface in the axial direction; and a groove bottom surface, which is arranged between the first side surface and the second side surface. The liner has: A cylinder portion, in sliding contact with the labyrinth ring; A force-applying portion, which is arranged radially inward of the cylindrical portion and is elastically deformable; a first protrusion continuously in contact with the first side surface in a circumferential direction; and a second protrusion continuously in contact with the second side surface in the circumferential direction, The urging portion has a plurality of contact portions that are intermittently provided along the circumferential direction and are in contact with the groove bottom surface.

[0026] According to the rolling bearing device, the liner is located between the groove bottom surface and the labyrinth ring when the force-applying portion is elastically compressed and deformed in the radial direction. The cylinder portion is brought into contact with the labyrinth ring by elastically compressing and deforming the force-applying portion in the radial direction. The contact portion of the force-applying portion is intermittently arranged along the circumferential direction. Therefore, with respect to the first sealing groove, for example, when the force-applying portion is greatly compressed in the radial direction, a portion of the force-applying portion can be elastically deformed in a circumferentially retreating manner, and the burden of the force-applying portion is less than that of the force-applying portion of the prior art.

[0027] According to the above, the spacer can follow the labyrinth ring to make contact, and the interference between the spacer and the labyrinth ring can be suppressed from becoming smaller.

[0028] The contact portion is intermittently arranged along the circumferential direction, and the force-applying portion has a range that does not contact the bottom surface of the groove. Therefore, the first protrusion is in continuous contact with the first side surface in the circumferential direction, and the second protrusion is in continuous contact with the second side surface in the circumferential direction. Therefore, there is sealing performance between the first sealing groove and the gasket.

[0029] (2) Preferably, the force-applying portion has a non-contact portion that connects two contact portions that are adjacent in the circumferential direction and does not contact the bottom surface of the groove. In this case, even if the force-applying portion and the barrel portion are made of different materials, the force-applying portion and the barrel portion are firmly joined. That is, the force-applying portion having a plurality of contact portions that are intermittently provided is unlikely to fall off from the barrel portion.

[0030] (3) Preferably, the contact portion includes: a radially outer portion fixed to the cylindrical portion; and a radially inner portion integral with the radially outer portion, wherein the radially inner portion includes two supporting portions extending from the radially outer portion to both sides in the circumferential direction and contacting the groove bottom surface, and a gap is formed between the portion between the two supporting portions and the groove bottom surface. In this case, when a radial load acts on the gasket, the two supporting portions are elastically deformed. The gasket is easy to elastically deform and easy to follow the labyrinth ring.

[0031] (4) In the rolling bearing device of (1) or (2) above, preferably, the contact portion comprises: a radially outer portion fixed to the cylindrical portion; and a radially inner portion integral with the radially outer portion, wherein the circumferential dimension of the radially inner portion varies along the radial direction. In this case, the portion of the contact portion with a small circumferential dimension is easily elastically deformed, and the liner is easy to follow the labyrinth ring.

[0032] (5) Preferably, in the rolling bearing device of any one of (1) to (4), the inner ring is a double-cut split ring, the outer ring has a convex portion along the spherical surface on the outer peripheral side of the outer ring, and the shaft box has: a first shaft box component having a concave portion along the spherical surface on which the convex portion can slide; and a second shaft box component integrated with the first shaft box component. The structure is a state in which a bearing unit having an inner ring, a plurality of rollers, an outer ring, and a shaft box is located on the outer peripheral side of the small diameter shaft portion of the pestle roller, and the pestle roller is supported on the shaft box via the above-mentioned bearing unit.

[0033] <Details of Embodiments of the Invention Disclosed>

[0034] Hereinafter, embodiments of the presently disclosed invention will be described.

[0035] [Overall structure of rolling bearing device]

[0036] Figure 1 1 is a cross-sectional view showing an example of a rolling bearing device 10. The rolling bearing device 10 is a device including a pestle-shaped roller 3 and a bearing unit 19. The bearing unit 19 has an inner ring 11, an outer ring 15, a plurality of cylindrical rollers (rolling elements) 13, a labyrinth ring 31, a gasket 32, an oil seal 33, and an axle box 14. The bearing unit 19 supports the pestle-shaped roller 3.

[0037] The pestle-shaped roller 3 is used in a continuous casting machine. The pestle-shaped roller 3 clamps the cast piece together with another opposing pestle-shaped roller and moves it. The pestle-shaped roller 3 compresses the cast piece to be moved while casting. The pestle-shaped roller 3 integrally includes a central small-diameter shaft portion 4 and two large-diameter portions 5, 5 provided on both axial sides of the small-diameter shaft portion 4. The large-diameter portion 5 has a larger diameter than the small-diameter shaft portion 4. The small-diameter shaft portion 4 of the pestle-shaped roller 3 is supported by a bearing unit 19.

[0038] In the rolling bearing device 10 of the present disclosure, the central axis of the pestle roller 3 coincides with the central axis L1 of the bearing unit 19, and the direction parallel to the central axis L1 is the axial direction of the rolling bearing device 10. In the present disclosure, the direction parallel to the central axis L1 is simply referred to as the "axial direction".

[0039] The direction orthogonal to the central axis L1 is the radial direction of the rolling bearing device 10. In the present disclosure, the direction orthogonal to the central axis L1 is simply referred to as the "radial direction".

[0040] The direction along a circle centered on the central axis L1 is the circumferential direction of the rolling bearing device 10. In the present disclosure, the direction along a circle centered on the central axis L1 is simply referred to as the "circumferential direction".

[0041] The common platen side of the casting machine segments to which the axle box 17 is fixed is referred to as "lower", and the opposite side is referred to as "upper".

[0042] Figure 1 is a cross-sectional view of a plane including the central axis L1 and the vertical direction. Figure 1 In the cross section shown, the axial first side and the axial second side of the axial center of the small-diameter shaft portion have a symmetrical structure.

[0043] The labyrinth ring 31, the gasket 32 ​​and the oil seal 33 are arranged on both axial sides of the rolling bearing device 10. In terms of shape, the labyrinth ring 31, the gasket 32 ​​and the oil seal 33 on the first axial side and the labyrinth ring 31, the gasket 32 ​​and the oil seal 33 on the second axial side have the same structure and are arranged symmetrically.

[0044] The axle box 14 has a two-part structure divided into upper and lower parts. The axle box 14 has a first axle box member 17 fixed to the common table of the casting machine segment and a second axle box member 18 mounted on the first axle box member 17. The first axle box member 17 and the second axle box member 18 are connected and fixed by bolts or the like outside the figure. The first axle box member 17 has a concave and spherical inner surface 17a on its upper surface side. The first axle box member 17 is a self-aligning wheel.

[0045] The outer ring 15 has a structure in which the self-aligning outer ring is divided into half on a plane containing the center axis thereof. The inner circumferential surface of the outer ring 15 has a shape along a cylindrical surface centered on the center axis L1. The inner circumferential surface of the outer ring 15 has an outer ring raceway 15c. The outer ring 15 has a convex spherical outer diameter surface 15d. The spherical outer diameter surface 15d abuts against and can slide against the concave and spherical inner surface 17a.

[0046] The second axle box component 18 is a component on the upper side of the axle box 14. The inner circumferential surface of the second axle box component 18 has a shape along a cylindrical surface centered on the central axis L1. The inner circumferential surface of the second axle box component 18 has an outer ring raceway 18c. By aligning the central axes of the outer ring 15 and the second axle box component 18 and combining them, an outer ring raceway 15c and an outer ring raceway 18c are obtained. The radius of the outer ring raceway 18c is slightly larger than the radius of the outer ring raceway 15c. The outer ring 15 can swing relative to the first axle box component 17 in coordination with the inclination of the inner ring 11. In contrast, the second axle box component 18 does not swing relative to the first axle box component 17.

[0047] The inner ring 11 is externally fitted to the small-diameter shaft portion 4 and mounted on the small-diameter shaft portion 4. The inner ring 11 rotates integrally with the pestle-shaped roller 3. The inner ring 11 is a double-cut split ring. The inner ring 11 includes a first inner ring split body 11a and a second inner ring split body 11b having a semi-cylindrical shape. The split surfaces of these inner ring split bodies 11a, 11b are on a plane including the central axis of the inner ring 11. The inner ring split bodies 11a, 11b are connected and fixed by bolts or the like outside the figure, thereby forming an integrated cylindrical member (inner ring 11). The inner ring 11 has a cylindrical inner ring raceway 11c on its outer circumference. The inner ring 11 has flanges 20, 20 having a larger diameter than the inner ring raceway 11c on both axial sides of the inner ring raceway 11c.

[0048] The inner ring raceway 11c and the outer ring raceways 15c and 18c are opposite to each other in the radial direction. The rollers 13 are arranged between the inner ring raceway 11c and the outer ring raceways 15c and 18c. By rotating the pestle rollers 3 together with the inner ring 11 relative to the outer ring 15 and the axle box 14, the rollers 13 roll on the inner ring raceway 11c and the outer ring raceways 15c and 18c.

[0049] Figure 2 Yes means Figure 1 The sectional view of a portion of the first axial side of the rolling bearing device 10 shown. The diameter of the outer peripheral surface 20a of the flange 20 of the inner ring 11 is larger than the diameter of the inner ring raceway 11c. The first sealing groove 71 and the second sealing groove 72 are provided on the outer peripheral surface 20a of the flange 20. The first sealing groove 71 and the second sealing groove 72 are respectively annular grooves. The sealing grooves 71 and 72 are recessed radially inward from the outer peripheral surface 20a. The first sealing groove 71 is a groove for mounting the gasket 32, and the second sealing groove 72 is a groove for mounting the oil seal 33.

[0050] Figure 3 : is a cross-sectional view for explaining the gasket 32 ​​and the first seal groove 71. The first seal groove 71 has an annular first side surface 66, an annular second side surface 67 axially opposed to the first side surface 66, and a groove bottom surface 68 provided between the first side surface 66 and the second side surface 67. The first side surface 66 is an annular plane extending radially inward from a portion of the outer peripheral surface 20a of the inner ring 11. The second side surface 67 is an annular plane extending radially inward from another portion of the outer peripheral surface 20a of the inner ring 11. The groove bottom surface 68 is a cylindrical surface extending axially from the radially inner end of the first side surface 66 and connected to the radially inner end of the second side surface 67. The groove bottom surface 68 is a cylindrical surface centered on the central axis of the inner ring 11. Although not shown in the figure, the groove bottom surface 68 may be, for example, a portion of a conical surface or an annular surface in addition to the cylindrical surface as described above.

[0051] [Maze Ring 31]

[0052] Labyrinth ring 31 (refer to Figure 1) is a component that is cylindrical as a whole. The labyrinth ring 31 is divided into two parts in the circumferential direction. The labyrinth ring 31 has a first semi-cylindrical portion 31a and a second semi-cylindrical portion 31b in a semi-cylindrical shape. The dividing surfaces of these semi-cylindrical portions 31a, 31b are on a plane containing the central axis of the labyrinth ring 31. The central axis of the labyrinth ring 31 is consistent with the central axis of the outer ring 15. The first semi-cylindrical portion 31a constituting the lower half of the labyrinth ring 31 is mounted on the first axle box component 17. The second semi-cylindrical portion 31b constituting the upper half of the labyrinth ring 31 is mounted on the second axle box component 18. The labyrinth ring 31 is radially opposite to the axial end (flange 20) of the inner ring 11.

[0053] Axial first side (at Figure 1 The labyrinth ring 31 (right side in the figure) is arranged to protrude from the shaft box 14 toward the first side in the axial direction. A portion 31c of the labyrinth ring 31 enters the concave circumferential groove 6 formed in the large diameter portion 5 of the pestle-shaped roller 3.

[0054] The second axial side (at Figure 1 The labyrinth ring 31 (left side in the figure) is arranged to protrude from the shaft box 14 toward the second axial side. A portion 31c of the labyrinth ring 31 enters the concave circumferential groove 6 formed in the large diameter portion 5 of the pestle-shaped roller 3.

[0055] On both sides in the axial direction, a labyrinth gap is formed between a portion 31c of the labyrinth ring 31 and the concave circumferential groove 6. The labyrinth gap prevents foreign matter such as cooling water from intruding into the bearing interior 16 from the outside.

[0056] [Oil seal 33]

[0057] exist Figure 2 In the embodiment, the oil seal 33 includes a fixing portion 52, lips 53, 54 and a metal ring 55. The fixing portion 52 and the lips 53, 54 are made of rubber. The fixing portion 52 and the lips 53, 54 are integral. The fixing portion 52 and the lips 53, 54 are annular. The fixing portion 52 and the lips 53, 54 are separated at one point in the circumferential direction. The metal ring 55 includes two arc-shaped metal plates. The metal ring 55 is respectively fixed to a portion of the fixing portion 52 that is closer to the first side in the circumferential direction than the separation portion and a portion that is closer to the second side in the circumferential direction than the separation portion.

[0058] The oil seal 33 is fitted into the second seal groove 72 and mounted therein. The oil seal 33 is annular in shape when mounted on the inner ring 11. Since the oil seal 33 is separated at one position in the circumferential direction, it can be mounted on the inner ring 11 having a smaller diameter than the large diameter portion 5 of the pestle roller 3.

[0059] When the pestle roller 3 and the inner ring 11 rotate, the oil seal 33 rotates integrally with the inner ring 11. The lips 53 and 54 of the oil seal 33 are in sliding contact with the inner peripheral surface 31d of the labyrinth ring 31.

[0060] [Pad 32]

[0061] exist Figure 3 In the embodiment, the spacer 32 includes a cylindrical portion 40 , a biasing portion 41 , a first protruding portion 46 , and a second protruding portion 47 .

[0062] The barrel 40 is annular. The barrel 40 is separated at one point in the circumferential direction. When the gasket 32 ​​is installed in the first sealing groove 71, the ends of the separated barrel 40 press against each other in the circumferential direction. The barrel 40 is made of resin. The barrel 40 can also be made of rubber instead of resin. In order to reduce the contact resistance between the barrel 40 and the labyrinth ring 31, the barrel 40 is preferably made of resin. In the present embodiment, the barrel 40 is made of polytetrafluoroethylene.

[0063] Figure 4 is a cross-sectional view of the gasket 32, showing Figure 3 The cross section viewed in the IV direction. Figure 4 In the figure, the groove bottom surface 68 of the first sealing groove 71 is indicated by a double-dotted line. The force-applying portion 41 has a plurality of contact portions 42 and a plurality of non-contact portions 43. The contact portions 42 and the non-contact portions 43 are alternately arranged in the circumferential direction. The contact portion 42 contacts the groove bottom surface 68. The non-contact portion 43 connects two circumferentially adjacent contact portions 42, 42. The non-contact portion 43 does not contact the groove bottom surface 68. The circumferentially adjacent contact portions 42, 42 are connected by the non-contact portion 43. Therefore, the force-applying portion 41 of the present embodiment is annular as a whole. At a circumferential separation position where the cylinder portion 40 is separated, the force-applying portion 41 is also separated in the circumferential direction. The force-applying portion 41 is made of rubber and can be elastically deformed.

[0064] exist Figure 3 In the embodiment, the force-applying portion 41, the first protrusion 46, and the second protrusion 47 are formed as one body. The force-applying portion 41, the first protrusion 46, and the second protrusion 47 are annular. The force-applying portion 41, the first protrusion 46, and the second protrusion 47 are separated at the same position as the separation position of the cylinder 40. When the gasket 32 ​​is mounted in the first sealing groove 71, the ends of the separated force-applying portion 41, the first protrusion 46, and the second protrusion 47 press each other in the circumferential direction.

[0065] The force-applying portion 41, the first protrusion 46 and the second protrusion 47 are made of rubber. In the present embodiment, the force-applying portion 41, the first protrusion 46 and the second protrusion 47 are made of fluororubber. The force-applying portion 41 is fixed to the radial inner side of the barrel 40. The force-applying portion 41 is bonded to the barrel 40 by, for example, an adhesive. The outer peripheral surface 40a of the barrel 40 is a cylindrical surface. A recess 40b is provided on the inner peripheral side of the barrel 40. A portion of the force-applying portion 41 enters the recess 40b. With this structure, the barrel 40 and the force-applying portion 41 are firmly joined.

[0066] The first protrusion 46 is located on the side surface 41a on the first axial side of the force applying portion 41. The second protrusion 47 is located on the side surface 41b on the second axial side of the force applying portion 41. The first protrusion 46 is located on the first axial side relative to the cylinder 40 and the force applying portion 41. The second protrusion 47 is located on the second axial side relative to the cylinder 40 and the force applying portion 41.

[0067] The first protrusion 46 is provided in an annular shape on the side surface 41a of the force-applying portion 41. The first protrusion 46 is in continuous contact with the first side surface 66 in the circumferential direction. The first protrusion 46 is located at a position closer to the first side in the axial direction than the side surface 41a of the force-applying portion 41. The second protrusion 47 is provided in an annular shape on the side surface 41b of the force-applying portion 41. The second protrusion 47 is in continuous contact with the second side surface 67 in the circumferential direction. The second protrusion 47 is located at a position closer to the second side in the axial direction than the side surface 41b of the force-applying portion 41. The first protrusion 46 and the second protrusion 47 are integrally formed with the force-applying portion 41.

[0068] The axial dimension of the cylinder 40 is the same as the axial dimension of the force-applying portion 41. The axial dimension of the radially outer portion 41j of the force-applying portion 41 including the joint portion with the cylinder 40 is the same as the axial dimension of the radially inner portion 41s of the force-applying portion 41 that contacts the groove bottom surface 68. The axial dimension of the radially outer portion 41j is the dimension of the portion excluding the first protrusion 46 and the second protrusion 47.

[0069] The gasket 32 ​​is fitted and installed in the first seal groove 71. The gasket 32 ​​is annular as a whole when installed in the inner ring 11. The gasket 32 ​​is separated at one position in the circumferential direction, so it can be installed in the inner ring 11 having a smaller diameter than the large diameter portion 5 of the pestle roller 3.

[0070] The biasing portion 41 is compressed and elastically deformed in the radial direction between the cylindrical portion 40 and the groove bottom surface 68 at the contact portion 42 . The cylindrical portion 40 is pressed against the labyrinth ring 31 by the contact portion 42 .

[0071] When the pestle roller 3 and the inner ring 11 rotate, the liner 32 rotates integrally with the inner ring 11. The cylindrical portion 40 is in sliding contact with the inner peripheral surface 31d of the labyrinth ring 31.

[0072] The gasket 32 ​​and the oil seal 33 are in contact with the labyrinth ring 31. The sealing performance of the gasket 32, the oil seal 33 and the labyrinth ring 31 prevents the cooling water and the casting scale from invading the bearing interior 16 where the plurality of rollers 10 are located from the outside of the rolling bearing device 10. The oil seal 33 also has the function of preventing the grease and oil of the oil gas, that is, the lubricant in the bearing interior 16 from leaking to the outside.

[0073] like Figure 4As shown, each contact portion 42 has a radially outer portion 41j on the radially outer side and a radially inner portion 41s on the radially inner side. The radially outer portion 41j is connected to the non-contact portion 43. The radially outer portion 41j and the non-contact portion 43 are integrated into an annular shape.

[0074] There are multiple radial inner portions 41s in the circumferential direction. The radial inner portions 41s are intermittently arranged in the circumferential direction. The radial inner portions 41s adjacent to each other in the circumferential direction are separated in the circumferential direction. The radial inner portion 41s is integrated with the radial outer portion 41j. The radial inner portion 41s contacts the groove bottom surface 68.

[0075] exist Figure 4 In the embodiment shown, the radially inner portion 41s has a first support portion 44 and a second support portion 45. The first support portion 44 extends from the radially outer portion 41j to the first side in the circumferential direction and to the radially inner side. The second support portion 45 extends from the radially outer portion 41j to the second side in the circumferential direction and to the radially inner side. The front end portion 44a of the first support portion 44 and the front end portion 45a of the second support portion 45 are in contact with the groove bottom surface 68. The front end portion 44a of the first support portion 44 and the front end portion 45a of the second support portion 45 are separated in the circumferential direction.

[0076] The state in which the gasket 32 ​​is installed in the first sealing groove 71 and the cylinder 40 is in contact with the labyrinth ring 31 is referred to as the "installed state of the gasket 32". In the installed state of the gasket 32, the first support portion 44 is compressed in the radial direction, and the front end portion 44a moves to the first side in the circumferential direction. In the installed state of the gasket 32, the second support portion 45 is compressed in the radial direction, and the front end portion 45a moves to the second side in the circumferential direction. The first support portion 44 and the second support portion 45 are stretched in a manner of being separated in the circumferential direction. In the installed state of the gasket 32, the gap E is located between the portion between the first support portion 44 and the second support portion 45 and the groove bottom surface 68.

[0077] A space P is provided radially inside the non-contact portion 43. When the cylindrical portion 40 is further pressed radially inward, the contact portion 42 is compressed in the radial direction and elastically deformed.

[0078] When the tip portion 44a slides on the groove bottom surface 68, the contact portion between the tip portion 44a and the groove bottom surface 68 moves to the first circumferential side (the space P side). When the tip portion 44a does not slide on the groove bottom surface 68, the contact portion (contact area) between the tip portion 44a and the groove bottom surface 68 expands to the second circumferential side (the gap E side).

[0079] When the tip portion 45a slides on the groove bottom surface 68, the contact portion between the tip portion 45a and the groove bottom surface 68 moves to the second circumferential side (the space P side). When the tip portion 45a does not slide on the groove bottom surface 68, the contact portion (contact area) between the tip portion 45a and the groove bottom surface 68 expands to the first circumferential side (the gap E side).

[0080] In addition, the radially inner portion 41s can expand toward the space P or the gap E. When the cylindrical portion 40 is further pressed radially inward, the contact portion 42 is compressed in the radial direction, and the radially inner portion 41s can retreat to the space P or the gap E. Therefore, the cylindrical portion 40 can easily move in the radial direction.

[0081] In the installed state of the gasket 32 ​​(refer to Figure 3 ), the first protrusion 46 contacts the first side surface 66 with an interference. The second protrusion 47 contacts the second side surface 67 with an interference. When the cylinder 40 moves in the radial direction, the first protrusion 46 can move in the radial direction while in contact with the first side surface 66. When the cylinder 40 moves in the radial direction, the second protrusion 47 can move in the radial direction while in contact with the second side surface 67.

[0082] [Modification of the gasket 32 ​​(1)]

[0083] Figure 5 1 is a cross-sectional view showing a modification example (1) of the gasket 32. Figure 4 Compared with the embodiment shown in the figure, the embodiment of the force applying portion 41 is different. It should be noted that the force applying portion 41 has the contact portion 42 and the non-contact portion 43, the plurality of contact portions 42 are intermittently provided along the circumferential direction and each contact portion 42 is in contact with the groove bottom surface 68, the non-contact portion 43 connects two contact portions 42, 42 adjacent in the circumferential direction and the non-contact portion 43 does not contact with the groove bottom surface 68, and the contact portion 42 has the radially outer portion 41j and the radially inner portion 41s.

[0084] exist Figure 4 In the illustrated embodiment, the contact portions of the radially inner portion 41 s with the groove bottom surface 68 are two portions of the first support portion 44 and the second support portion 45 .

[0085] exist Figure 5 In the case of the modification (1) shown, the radial inner portion 41s contacts the groove bottom surface 68 at one point. The radial inner portion 41s has a shape in which the circumferential dimension decreases from the radial outer portion 41j toward the groove bottom surface 68. According to the structure of the contact portion 42 of the modification (1), the molding (demolding) of the force applying portion 41 becomes easy.

[0086] When the cylindrical portion 40 is further pressed radially inward, the contact portion 42 is compressed in the radial direction and elastically deformed.

[0087] [Modification of the gasket 32 ​​(2)]

[0088] Figure 62 is a cross-sectional view showing a modification example (2) of the gasket 32. Figure 6 In the case of the modification (2) shown, the radially inner portion 41 s contacts the groove bottom surface 68 at one location. Figure 6 The variation (2) shown is similar to Figure 5 Compared with the modification (1) shown in the figure, the radial inner portion 41s is different in form. The radial inner portion 41s has a shape whose circumferential dimension increases toward the groove bottom surface 68. In the case of modification (2), the contact area of ​​the contact portion 42 with the groove bottom surface 68 becomes larger, so it is difficult for the liner 32 to be misaligned with the inner ring 11 in the circumferential direction.

[0089] When the cylindrical portion 40 is further pressed radially inward, the contact portion 42 is compressed in the radial direction and elastically deformed.

[0090] As mentioned above, in Figure 5 The modification (1) and Figure 6 In the modification (2) shown, the circumferential dimension of the contact portion 42 changes along the radial direction of the contact portion 42. The contact portion 42 has a radially inner portion 41s in which the circumferential dimension changes along the radial direction at least in a part thereof.

[0091] [Modification of the gasket 32 ​​(3)]

[0092] Figure 7 : is a cross-sectional view showing a modified example (3) of the gasket 32. Figure 7 In the case of the modification (3) shown, the contact portion of the radial inner portion 41s with the groove bottom surface 68 is one place. The modification (3) is different from the modification (1) and the modification (2) in that the radial inner portion 41s is arranged in a different manner. The surface 49a on the first circumferential side of the radial inner portion 41s is parallel to the surface 49b on the second circumferential side of the radial inner portion 41s. The surface 49a on the first side and the surface 49b on the second side are surfaces parallel to the axial direction. The imaginary plane is located at the center of the surface 49a on the first side and the surface 49b on the second side along the radial direction.

[0093] The circumferential (tangential) dimension between the surface 49a of the first side and the surface 49b of the second side does not change. That is, along the radial extension direction of the radial inner portion 41s, the tangential dimension of the radial inner portion 41s is constant. When the cylinder 40 is further pressed radially inward, the contact portion 42 is compressed in the radial direction and elastically deformed. At this time, the radial inner portion 41s can expand toward the space P.

[0094] Figure 5 , Figure 6 and Figure 7 The cross-sectional shape of the contact portion 42 of the gasket 32 ​​in each embodiment is different from Figure 3The shapes shown are the same. Figure 5 , Figure 6 and Figure 7 The spacer 32 in each embodiment also has the first protrusion 46 and the second protrusion 47 which are annular.

[0095] [Regarding each type of rolling bearing device 10]

[0096] As described above, the rolling bearing device 10 of each of the above-mentioned forms is provided with a gasket 32 ​​mounted on the inner ring 11 and in sliding contact with the labyrinth ring 31. The gasket 32 ​​of each form has: a cylinder 40 in sliding contact with the labyrinth ring 31; a force application portion 41 provided on the radial inner side of the cylinder 40 and capable of elastic deformation; a first protrusion 46 in continuous contact with the first side surface 66 of the first seal groove 71 in the circumferential direction; and a second protrusion 47 in continuous contact with the second side surface 67 of the first seal groove 71 in the circumferential direction. The force application portion 41 has a plurality of contact portions 42. The plurality of contact portions 42 are provided intermittently along the circumferential direction and in contact with the groove bottom surface 68 of the first seal groove 71.

[0097] According to the rolling bearing device 10 having the liner 32 of each of the above-mentioned forms, the liner 32 is interposed between the groove bottom surface 68 and the labyrinth ring 31 in a state where the force-applying portion 41 is elastically compressed and deformed in the radial direction. The force-applying portion 41 is elastically compressed and deformed in the radial direction, so that the cylinder portion 40 follows the labyrinth ring 31 and contacts it. Moreover, the contact portion 42 of the force-applying portion 41 is intermittently provided in the circumferential direction. Therefore, in the first sealing groove 71, for example, even when the force-applying portion 41 is greatly compressed in the radial direction, a part of the force-applying portion 41 can be elastically deformed in a manner of retreating in the circumferential direction, and the burden on the force-applying portion 41 is smaller than that on the liner of the conventional structure.

[0098] According to the above, the gasket 32 ​​can follow the labyrinth ring 31 and contact, and the reduction of the interference between them can be suppressed. The contact portion 42 is intermittently (discontinuously) provided along the circumferential direction, and there is a range in the force-applying portion 41 that does not contact the first seal groove 71. However, the first protrusion 46 is in continuous contact with the first side surface 66 of the first seal groove 71 in the circumferential direction. The second protrusion 47 is in continuous contact with the second side surface 67 of the first seal groove 71 in the circumferential direction. Therefore, the sealing performance between the first seal groove 71 and the gasket 32 ​​can be ensured.

[0099] In the gasket 32 ​​of each of the above-mentioned embodiments, the force-applying portion 41 further includes a non-contact portion 43 that connects two contact portions 42, 42 adjacent to each other in the circumferential direction and does not contact the groove bottom surface 68. Therefore, the joining area between the force-applying portion 41 and the barrel portion 40 is expanded in the circumferential direction, and even if the force-applying portion 41 and the barrel portion 40 are made of different materials, they are firmly joined. That is, the force-applying portion 41 having a plurality of contact portions 42 provided intermittently is unlikely to fall off from the barrel portion 40.

[0100] exist Figure 4 In the case of the liner 32 shown, the contact portion 42 has a radially outer portion 41j fixed to the cylinder 40 and a radially inner portion 41s integral with the radially outer portion 41j. The radially inner portion 41s has two support portions 44, 45. The support portions 44, 45 extend from the radially outer portion 41j to both sides in the circumferential direction and contact the groove bottom surface 78. In the case of the liner 32 in which the gap E is formed between the portion between the two support portions 44, 45 and the groove bottom surface 78, when a radial load acts, the contact portion 42 elastically deforms in the radial direction, and the two support portions 44, 45 deform. The size of elastic deformation that the liner 32 can achieve becomes larger, and it is easy to follow the labyrinth ring 31.

[0101] exist Figure 5 and Figure 6 In the case of the liner 32 shown, the contact portion 42 has a radially outer portion 41j fixed to the cylinder 40 and a radially inner portion 41s integral with the radially outer portion 41j. The circumferential dimension of the radially inner portion 41s changes along the radial direction. In the case of such a liner 32, the contact portion 42 is easily elastically deformed by utilizing the portion with a small circumferential dimension. Therefore, Figure 5 and Figure 6 The liner 32 shown is Figure 7 The illustrated pad 32 is relatively easy to follow.

[0102] Figure 5 , Figure 6 as well as Figure 7 In the illustrated manner, the spacer 32 is caused to follow the contact portion 42 through elastic deformation of the entire contact portion 42 in the radial direction.

[0103] [other]

[0104] The shape of the contact portion 42 can be changed within the scope of the present disclosure. Figure 5 and Figure 6 In the illustrated embodiment, the circumferential dimension of the radially inner portion 41s varies linearly along the radial direction of the contact portion 42. That is, the side surface of the radially inner portion 41s facing the circumferential direction is a plane. As another configuration, the circumferential dimension of the radially inner portion 41s may vary nonlinearly along the radial direction of the contact portion 42.

[0105] In addition, the liner of the rolling bearing device of the present invention may also be Figure 4 , Figure 5 , Figure 6 and Figure 7 At least two of the contact portions 42 in the manner shown are combined to form the gasket 32 ​​.

[0106] The above-described embodiments are illustrative in all respects and are not restrictive. The scope of rights of the present invention is indicated by the claims rather than the above-described embodiments, and includes all modifications within the scope equivalent to the structures described in the claims.

[0107] Description of Reference Numerals

[0108] 3 Pestle Rollers

[0109] 4 Small diameter shaft

[0110] 5 large diameter part

[0111] 10 Rolling bearing device

[0112] 11 Inner Circle

[0113] 11c Inner ring raceway

[0114] 13 Roller

[0115] 14 Axle Box

[0116] 15 Outer ring

[0117] 15c Outer ring raceway

[0118] 15d spherical outer diameter surface (convex part)

[0119] 17 First axle box component

[0120] 17a Concave-shaped inner surface (concave portion)

[0121] 18 Second axle box component

[0122] 31 Maze Ring

[0123] 32 Pad

[0124] 33 Oil seal

[0125] 40 barrel

[0126] 41 Force application part

[0127] 41j Radially outer portion

[0128] 41s radial inner part

[0129] 42 Contact Department

[0130] 43 Non-contact part

[0131] 44 first support

[0132] 45 Second support portion

[0133] 46 First protrusion

[0134] 47 Second protrusion

[0135] 66 First side

[0136] 67 Second side

[0137] 68 Slot bottom

[0138] 71 First sealing groove

[0139] 72 Second sealing groove

[0140] E Clearance

Claims

1. A rolling bearing device, comprising: pestle roller; axle box; An inner ring, which rotates integrally with the pestle-shaped roller and has an inner ring raceway; an outer ring having an outer ring raceway opposite to the inner ring raceway and mounted on the axle box; A plurality of rollers are arranged between the inner ring raceway and the outer ring raceway; a labyrinth ring mounted on the axle box in a manner radially opposite to the axial end of the inner ring; a gasket mounted on the inner ring and in sliding contact with the labyrinth ring; and An oil seal is mounted on the inner ring and in sliding contact with the labyrinth ring, The pestle roller includes a small-diameter shaft portion to which the inner ring is mounted and two large-diameter portions having a larger diameter than the small-diameter shaft portion. A first sealing groove in which the gasket is installed and a second sealing groove in which the oil seal is installed are provided on the outer periphery of the inner ring. The first sealing groove comprises: an annular first side surface; an annular second side surface, which is opposite to the first side surface in the axial direction; and a groove bottom surface, which is arranged between the first side surface and the second side surface. The liner has: a cylinder portion, in sliding contact with the labyrinth ring; A force-applying portion, which is arranged radially inward of the cylindrical portion and is elastically deformable; a first protrusion continuously contacting the first side surface in a circumferential direction; as well as a second protrusion continuously in contact with the second side surface in the circumferential direction, The urging portion has a plurality of contact portions that are intermittently provided along the circumferential direction and are in contact with the groove bottom surface.

2. The rolling bearing device according to claim 1, wherein: The biasing portion includes a non-contact portion that connects two of the contact portions adjacent to each other in the circumferential direction and does not contact the groove bottom surface.

3. The rolling bearing device according to claim 1 or 2, wherein: The contact portion has: a radially outer portion fixed to the cylindrical portion; and a radially inner portion, which is integral with the radially outer portion, The radially inner portion has two support portions extending from the radially outer portion to both sides in the circumferential direction and in contact with the groove bottom surface, and a gap is formed between a portion between the two support portions and the groove bottom surface.

4. The rolling bearing device according to claim 1 or 2, wherein: The contact portion has: a radially outer portion fixed to the cylindrical portion; and a radially inner portion, which is integral with the radially outer portion, The circumferential dimension of the radial inner portion varies along the radial direction.

5. The rolling bearing device according to claim 1 or 2, wherein: The inner ring is a double-cut split ring. The outer ring has a convex portion along the spherical surface on the outer peripheral side of the outer ring, The axle box includes: a first axle box member having a concave portion along a spherical surface on which the convex portion can slide; and a second axle box member integrated with the first axle box member.

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