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 device (12), a plurality of rollers (13), a labyrinth ring (31) attached to an axle box (17), and an oil seal (33) that is in sliding contact with the labyrinth ring (31). The outer periphery of the inner ring (11) is provided with a second seal groove (72) in which the oil seal (33) is attached. The second seal groove (72) has a first side surface (76), a second side surface (77), and a groove bottom surface (78). The oil seal (33) has a fixed portion (51) provided along the groove bottom surface (78), a lip portion (55) in contact with the labyrinth ring (31), and a biasing portion (52). The biasing section (52) has a first extension section (61) extending from the fixed section (51), and a second extension section (62) extending from a relay section (64) of the first extension section (61). At least a part of the first extension section (61) and the second extension section (62) is provided between the first side surface (76) and the second side surface (77), and the relay section (64) can be in contact with the side surface (76).

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 diameters larger than the small-diameter shaft portion. In order to mount 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 sealing ring, 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 sealing ring and the oil seal are mounted on the inner ring. The sealing ring 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] like Figure 5 As shown, the rolling bearing device disclosed in Patent Document 1 has a sealing groove in the inner ring 91. An oil seal 99 is installed in the sealing groove 92. The oil seal 99 has a lip 98. The lip 98 contacts the inner peripheral surface 96a of the labyrinth ring 96. Since the lip 98 is located on the outer peripheral side of the oil seal 99, it is difficult to install an annular spring on the lip 98 to increase the pressing force of the lip 98 relative to the labyrinth ring 96.

[0009] Therefore, in order to increase the pressure of the lip 98, it is considered to set the interference of the lip 98 with respect to the labyrinth ring 96 to be larger. However, in this case, the following problems arise. For example, due to the assembly accuracy of the rolling bearing device, when the interval between the groove bottom surface 92c of the seal groove 92 and the inner peripheral surface 96a of the labyrinth ring 96 is narrowed in a part of the circumferential direction, the lip 98 is greatly flattened in one direction in a part of the circumferential direction. In this case, the rotation resistance of the rolling bearing device increases, or the contact state of the lip 98 with respect to the labyrinth ring 96 is different from the expected state, and the sealing performance is deteriorated.

[0010] Therefore, an object of the present disclosure is to provide a rolling bearing device including an oil seal whose lip portion is not easily crushed and can contact with a labyrinth ring with a desired interference.

[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 sealing ring, 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 for installing the sealing ring and a second sealing groove for installing the oil seal are provided on the outer periphery of the inner ring. The second sealing groove has an annular first side surface, an annular second side surface opposite to the first side surface in the axial direction, and a groove bottom surface arranged between the first side surface and the second side surface. The oil seal has: A fixing portion, arranged along the bottom surface of the groove; a lip in contact with the labyrinth ring; and a force applying portion, disposed between the fixing portion and the lip portion, The force applying portion has: A first extending portion extending from the fixing portion to the outside in a radial direction and to a first side in an axial direction; and The second extension portion extends from the radially outer portion of the first extension portion, namely the intermediate portion, to the radially outer side and the second axial side. The entire first extension portion and at least a portion of the second extension portion are provided between the first side surface and the second side surface, and the relay portion can be in contact with a side surface adjacent to the relay portion among the first side surface and the second side surface.

[0013] Effects of the Invention

[0014] According to the rolling bearing device of the present disclosure, in the oil seal, the lip portion is less likely to be crushed and can be brought into contact with the labyrinth ring with a desired interference. 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 1 A 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 oil seal and the second seal groove.

[0018] Figure 4 It is a cross-sectional view showing a modified example of the oil seal.

[0019] Figure 5 This is a cross-sectional view of a conventional oil seal. DETAILED DESCRIPTION

[0020] <Overview of Embodiments of the Invention Disclosed>

[0021] Hereinafter, embodiments of the present invention will be described by listing them in outline.

[0022] (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 sealing ring, 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 comprises 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 for installing the sealing ring and a second sealing groove for installing the oil seal are provided on the outer periphery of the inner ring. The second sealing groove has an annular first side surface, an annular second side surface opposite to the first side surface in the axial direction, and a groove bottom surface arranged between the first side surface and the second side surface. The oil seal has: A fixing portion, arranged along the bottom surface of the groove; a lip in contact with the labyrinth ring; and a force applying portion, disposed between the fixing portion and the lip portion, The force applying portion has: A first extending portion extending from the fixing portion to the outside in a radial direction and to a first side in an axial direction; and The second extension portion extends from the radially outer portion of the first extension portion, namely the intermediate portion, to the radially outer side and the second axial side. The entire first extension portion and at least a portion of the second extension portion are provided between the first side surface and the second side surface, and the relay portion can be in contact with a side surface adjacent to the relay portion among the first side surface and the second side surface.

[0023] According to the rolling bearing device, the oil seal is located between the groove bottom surface and the labyrinth ring in a state of elastic compression deformation in the radial direction. The lip follows the labyrinth ring to make contact through the elastic compression deformation and elastic restoring force of the force-applying portion. The first extension portion and the second extension portion of the force-applying portion are elastically deformed respectively, so the oil seal as a whole is easily elastically deformed in the radial direction, and the rigidity of the oil seal is reduced. As a result, even if the interval between the groove bottom surface and the inner peripheral surface of the labyrinth ring is narrowed in a part of the circumferential direction, the lip is unlikely to be flattened to one side. Therefore, the lip can contact the labyrinth ring with a desired interference.

[0024] Even if the force-applying portion is elastically deformed in the radial direction and displaced in the axial direction, the relay portion can still contact the side surface of the second seal groove. The force-applying portion is limited in position by the side surface, and the overall posture of the oil seal is not easily damaged. The lip portion can contact the labyrinth ring while maintaining a desired interference.

[0025] (2) Preferably, a gap is provided between the relay portion and the side surface adjacent to the relay portion, and when the inner ring and the labyrinth ring move relative to each other in the axial direction, the relay portion contacts the side surface. When there is no gap between the relay portion and the side surface adjacent to the relay portion, and the axial width dimension of the first extension portion is the same as or larger than the axial dimension of the second sealing groove, the force-applying portion may be constrained by the side surface. However, by providing the gap, the force-applying portion is less likely to be constrained by the side surface, and the lip portion easily follows the labyrinth ring, and the sealing performance is not reduced.

[0026] (3) Preferably, the force-applying portion includes a third extension portion, which extends radially outward and axially to the first side from the radially outer portion of the second extension portion, i.e., the second relay portion, and the lip portion extends from the radially outer portion of the third extension portion toward the labyrinth ring. According to this structure, the range in which the oil seal can be elastically deformed in the radial direction can be increased.

[0027] <Details of Embodiments of the Disclosed Invention>

[0028] Hereinafter, embodiments of the presently disclosed invention will be described.

[0029] [Overall structure of rolling bearing device]

[0030] 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 sealing ring 32, an oil seal 33, and an axle box 14. The bearing unit 19 supports the pestle-shaped roller 3.

[0031] The pestle-shaped roller 3 is used in a continuous casting machine. The pestle-shaped roller 3 clamps the cast sheet together with another opposing pestle-shaped roller and moves it. The pestle-shaped roller 3 compresses the moving cast sheet 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.

[0032] 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".

[0033] 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".

[0034] 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".

[0035] The common platen side of the casting machine stage to which the shaft box 17 is fixed is referred to as "lower", and the opposite side is referred to as "upper".

[0036] 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.

[0037] The labyrinth ring 31, the seal ring 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 seal ring 32 and the oil seal 33 on the first axial side and the labyrinth ring 31, the seal ring 32 and the oil seal 33 on the second axial side have the same structure and are arranged symmetrically.

[0038] 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 section and a second axle box member 18 placed above 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 centering ring.

[0039] The outer ring 15 has a structure in which the self-aligning outer ring is divided into half by a plane containing its central axis. The inner circumferential surface of the outer ring 15 has a shape along a cylindrical surface centered on the central 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 is in contact with and can slide against the concave and spherical inner surface 17a.

[0040] 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.

[0041] 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 has 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.

[0042] 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. The pestle-shaped rollers 3 rotate together with the inner ring 11 relative to the outer ring 15 and the axle box 14, so that the rollers 13 roll on the inner ring raceway 11c and the outer ring raceways 15c and 18c.

[0043] Figure 2 Yes means Figure 1The 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 sealing ring 32, and the second sealing groove 72 is a groove for mounting the oil seal 33.

[0044] As will be described later, the seal ring 32 and the oil seal 33 are in contact with the inner peripheral surface 31d of the labyrinth ring 31. The sealing performance of the seal ring 32 and the oil seal 33 and the labyrinth ring 31 prevents the cooling water and the casting scale from intruding from the outside of the rolling bearing device 10 into the bearing interior 16 where the plurality of rollers 10 are present. The oil seal 33 also has a function of preventing the grease in the bearing interior 16 and the lubricant such as oil as oil gas from leaking to the outside.

[0045] Figure 3 2 is a cross-sectional view for explaining the oil seal 33 and the second seal groove 72. The second seal groove 72 has an annular first side surface 76, an annular second side surface 77 axially opposite to the first side surface 76, and a groove bottom surface 78 provided between the first side surface 76 and the second side surface 77. The first side surface 76 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 77 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 78 is a cylindrical surface extending axially from the radially inner end of the first side surface 76 and connected to the radially inner end of the second side surface 77. The groove bottom surface 78 is a cylindrical surface centered on the central axis of the inner ring 11. Although not shown in the figure, the groove bottom surface 78 may be a conical surface or a portion of a circular ring, for example, in addition to the cylindrical surface as described above.

[0046] 〔Labyrinth Ring 31〕

[0047] 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.

[0048] Axial first side (at Figure 1The labyrinth ring 31 (right side in the figure) is arranged to protrude from the shaft box 14 toward the first 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.

[0049] The second axial side (at Figure 1 The labyrinth ring 31 (left side in the middle) is protruded 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.

[0050] 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.

[0051] [Sealing ring 32]

[0052] like Figure 2 As shown, the seal ring 32 is embedded and installed in the first seal groove 71. The seal ring 32 includes a cylinder portion 40 that is in sliding contact with the labyrinth ring 31 and a force-applying portion 41 that is provided radially inside the cylinder portion 40. The entire seal ring 32 including the cylinder portion 40 may be made of rubber, but in order to reduce the contact resistance with the labyrinth ring 31, the cylinder portion 40 is made of resin. The seal ring 32 is separated at one position in the circumferential direction.

[0053] The seal ring 32 is annular as a whole when mounted on the inner ring 11. Since the seal ring 32 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.

[0054] When the pestle roller 3 and the inner ring 11 rotate, the seal ring 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.

[0055] 〔Oil seal 33〕

[0056] The oil seal 33 is inserted into and installed in the second seal groove 72 .

[0057] The oil seal 33 is annular as a whole 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.

[0058] 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.

[0059] like Figure 3As shown, the oil seal 33 includes a fixing portion 51, a force applying portion 52, a first lip portion 53, and a second lip portion 54. Hereinafter, the first lip portion 53 and the second lip portion 54 are collectively referred to as "lip portion 55". The fixing portion 51 is provided along the groove bottom surface 78. The lip portion 55 is in contact with the inner peripheral surface 31d of the labyrinth ring 31. The force applying portion 52 is provided between the fixing portion 51 and the lip portion 55. The fixing portion 51, the force applying portion 52, the first lip portion 53, and the second lip portion 54 are made of rubber and can be elastically deformed.

[0060] The fixing portion 51 has a cylindrical shape. The fixing portion 51 has a protrusion 56 protruding radially inward from its inner circumferential surface. The protrusion 56 is provided at multiple locations in the circumferential direction. A hole 57 for inserting the protrusion 56 is provided on the groove bottom surface 78. By inserting the protrusion 56 into the hole 57, the oil seal 33 does not rotate relative to the inner ring 11.

[0061] The force applying portion 52 has a first extending portion 61 and a second extending portion 62. Figure 3 In the oil seal 33 shown, the force applying portion 52 further has a third extending portion 63 .

[0062] The first extension portion 61 extends from the fixing portion 51 to the radially outer side and to the first side in the axial direction (at the Figure 3 The first extension portion 61 extends from the second side (in the axial direction of the fixing portion 51) of the fixing portion 51. Figure 3 The gap e1 extends to the portion including the end portion 51a of the first extension portion 61 (left side in the figure). The gap e1 is located at the radially outer portion of the first extension portion 61, that is, the first side of the first intermediate portion 64 and the fixed portion 51 in the axial direction (at the left side). Figure 3 The structure is radially arranged between the end portions 51b (right side in the center).

[0063] The second extension portion 62 extends from the first intermediate portion 64 to the radially outer side and the axially second side (at the Figure 3 The gap e2 is formed at the radially outer side of the second extension portion 62, that is, the second side of the axial direction between the second relay portion 65 and the first extension portion 61 (in the left side). Figure 3 The left side is arranged radially between the ends 61a.

[0064] The third extending portion 63 extends from the second intermediate portion 62 of the second extending portion 62 to the radially outer side and the first side in the axial direction (at the Figure 3 The gap e3 is located at the radially outer side of the third extension portion 63, that is, the first side of the axial direction between the third intermediate portion 66 and the second extension portion 62 (in the right side). Figure 3 The lip portion 55 is radially arranged between the end portions 62a of the third extension portion 63 and the right side thereof.

[0065] The first lip portion 53 extends from the third intermediate portion 66 toward the radially outer side and toward the second axial side (at Figure 3 The second lip portion 54 extends from the third relay portion 66 toward the radially outer side and toward the first side in the axial direction (at Figure 3 right side).

[0066] The entire first extension portion 61 and the entire second extension portion 62 are disposed between the first side surface 76 and the second side surface 77. That is, the entire first extension portion 61 and the entire second extension portion 62 are disposed within the range of the second sealing groove 72. The first relay portion 64 can contact the adjacent first side surface 76. In the present embodiment, the gap E1 is provided between the first relay portion 64 and the first side surface 76. If the inner ring 11 and the labyrinth ring 31 move relative to each other in the axial direction, the force applying portion 52 is elastically deformed in the axial direction, and the first relay portion 64 contacts the first side surface 76.

[0067] The third extension portion 63 is entirely disposed between the first side surface 76 and the second side surface 77. That is, the third extension portion 63 is entirely disposed within the range of the second sealing groove 72. The second relay portion 65 can contact the adjacent second side surface 77. In the present embodiment, the gap E2 is provided between the second relay portion 65 and the second side surface 77. If the inner ring 11 and the labyrinth ring 31 move relative to each other in the axial direction, the force applying portion 52 is elastically deformed in the axial direction, and the second relay portion 65 contacts the second side surface 77.

[0068] The third relay portion 66 can contact the adjacent first side surface 76. In the present embodiment, the gap E3 is provided between the third relay portion 66 and the first side surface 76. If the inner ring 11 and the labyrinth ring 31 move relative to each other in the axial direction, the force applying portion 52 elastically deforms in the axial direction, and the third relay portion 66 contacts the first side surface 76.

[0069] The side surface 64s of the first relay portion 64, the side surface 65s of the second relay portion 65, and the side surface 66s of the third relay portion 66 are planar shapes parallel to the side surface (the first side surface 76 or the second side surface 77) adjacent to them in the second seal groove 72. The relay portions 64, 65, 66 of the oil seal 33 can be in contact with the side surface (the first side surface 76 or the second side surface 77) of the second seal groove 72 with their surfaces.

[0070] exist Figure 3 In the embodiment shown, the entire third extension portion 63 may be disposed between the first side surface 76 and the second side surface 77, while a portion of the third extension portion 63 may be disposed between the first side surface 76 and the second side surface 77. Furthermore, the entire third extension portion 63 may be disposed outside the second sealing groove 72. In this case, at least a portion of the second extension portion 62 may be disposed between the first side surface 76 and the second side surface 77.

[0071] [Modification of oil seal 33]

[0072] Figure 4 is a cross-sectional view showing a modified example of the oil seal 33. The second seal groove 72 and Figure 3 The second sealing groove 72 is shown in the same manner. Figure 4 The oil seal 33 shown is Figure 3 The oil seal 33 of the embodiment shown in the figure similarly has a fixing portion 51, a biasing portion 52, a first lip portion 53, and a second lip portion 54. The fixing portion 51 is provided along the groove bottom surface 78. The lip portion 55 contacts the inner peripheral surface 31d of the labyrinth ring 31. The biasing portion 52 is provided between the fixing portion 51 and the lip portion 55.

[0073] The fixing portion 51 has a cylindrical shape. Figure 4 The oil seal 33 shown includes an annular spring 70 that presses the fixing portion 51 against the groove bottom surface 78 . Figure 4 The oil seal 33 shown is Figure 3 The oil seal 33 shown in the figure is different in that it has a spring 70. The spring 70 restrains the oil seal 33 from rotating relative to the inner ring 11. Figure 3 The structure formed by the protrusion 56 and the hole 57 shown.

[0074] Figure 4 The force applying portion 52 of the embodiment shown in FIG. Figure 3 The force applying portion 52 of the illustrated embodiment is different. Figure 4 The force applying portion 52 in the embodiment shown in the figure has a first extension portion 61 and a second extension portion 62, and does not have Figure 3 The third extension portion 63 of the force applying portion 52 is shown in the manner shown. Figure 4 The force applying portion 52 of the oil seal 33 shown in FIG. Figure 3 The structure of the oil seal 33 shown is the same as that of Figure 4 The structure of the oil seal 33 shown in the figure is the same as Figure 3 The structures of the oil seal 33 shown are provided with the same reference numerals.

[0075] The first extension portion 61 extends from the fixing portion 51 to the radially outer side and to the first side in the axial direction (at the Figure 4 The first extension portion 61 extends from the second side (in the axial direction of the fixing portion 51) of the fixing portion 51. Figure 4 The gap e1 extends to the portion including the end portion 51b of the first extension portion 61 (right side in the figure). The gap e1 is located at the radially outer portion of the first extension portion 61, that is, the first side of the first intermediate portion 64 and the fixed portion 51 in the axial direction (at the right side). Figure 4 The left side is arranged radially between the ends 51a.

[0076] The second extension portion 62 extends from the first intermediate portion 64 to the radially outer side and the axially second side (at the Figure 4The gap e2 is located at the radially outer side of the second extension portion 62, that is, the second side of the axial direction between the second relay portion 65 and the first extension portion 61 (in the right side). Figure 4 The lip portion 55 extends from the second intermediate portion 65 of the second extension portion 62 toward the labyrinth ring 31.

[0077] The entire first extension portion 61 and the entire second extension portion 62 are disposed between the first side surface 76 and the second side surface 77. That is, the entire first extension portion 61 and the entire second extension portion 62 are disposed within the range of the second sealing groove 72. The first relay portion 64 can contact the adjacent second side surface 77. In the present embodiment, the gap E4 is provided between the first relay portion 64 and the second side surface 77. If the inner ring 11 and the labyrinth ring 31 move relative to each other in the axial direction, the force applying portion 52 is elastically deformed in the axial direction, and the first relay portion 64 contacts the second side surface 77.

[0078] The second relay portion 65 can contact the adjacent first side surface 76. In the present embodiment, the gap E5 is provided between the second relay portion 65 and the first side surface 76. When the inner ring 11 and the labyrinth ring 31 move relative to each other in the axial direction, the force applying portion 52 elastically deforms in the axial direction, and the second relay portion 65 contacts the first side surface 76.

[0079] exist Figure 4 In the illustrated embodiment, the entire second extension portion 62 may be disposed between the first side surface 76 and the second side surface 77 , while a portion of the second extension portion 62 may be disposed between the first side surface 76 and the second side surface 77 .

[0080] [Regarding each type of rolling bearing device 10]

[0081] As described above, the rolling bearing device 10 includes the oil seal 33 mounted on the inner ring 11 and in sliding contact with the labyrinth ring 31. The oil seal 33 of each embodiment includes the fixing portion 51 provided along the groove bottom surface 78, the lip portion 55 in contact with the labyrinth ring 31, and the biasing portion 52 provided between the fixing portion 51 and the lip portion 55. The biasing portion 52 includes the first extension portion 61 and the second extension portion 62.

[0082] The first extension portion 61 extends from the fixing portion 51 to the radially outer side and the first side in the axial direction. The second extension portion 62 extends from the radially outer portion of the first extension portion 61, that is, the first relay portion 64, to the radially outer side and the second side in the axial direction. The entire first extension portion 61 and at least a portion of the second extension portion 62 are disposed between the first side surface 76 and the second side surface 77. The first relay portion 64 can contact the side surface adjacent to the first relay portion 64 among the first side surface 76 and the second side surface 77.

[0083] According to the rolling bearing device 10 having the oil seal 33 of each of the above-mentioned forms, the oil seal 33 is interposed between the groove bottom surface 78 and the labyrinth ring 31 in a state of elastic compression deformation in the radial direction. The lip portion 55 follows the labyrinth ring 31 and contacts it due to the elastic compression deformation and elastic restoring force of the force applying portion 41. The first extension portion 61 and the second extension portion 62 of the force applying portion 41 are elastically deformed, respectively, so that the oil seal 33 as a whole is easily elastically deformed in the radial direction, and the rigidity of the oil seal 33 is reduced. That is, the flexibility of the oil seal 33 in the radial direction becomes greater.

[0084] As a result, even if the interval between the groove bottom surface 78 and the inner peripheral surface 31d of the labyrinth ring 31 is narrowed in a part of the circumferential direction, the lip portion 55 is less likely to be crushed in one direction. Therefore, the lip portion 55 can contact the labyrinth ring 31 with a desired interference.

[0085] like Figure 3 and Figure 4 As shown in FIG. 1 , in a cross section including the central axis L1, the first extension portion 61 and the second extension portion 62 are respectively extended in a straight line and intersect at an acute angle. Figure 3 In the case of the oil seal 33 shown, the third extension portion 63 extends linearly, and the second extension portion 62 intersects the third extension portion 63 at an acute angle. With this structure, the oil seal 33 can be reduced in radial dimension and easily elastically deformed in the radial direction. That is, the oil seal 33 becomes more flexible.

[0086] Figure 5 The conventional oil seal 99 shown has two circular arc members 100 made of metal embedded in the fixing portion 97, in addition to the fixing portion 97 and the lip portion 98 made of rubber. The two circular arc members 100 are embedded in the fixing portion 97 to be spaced apart in the circumferential direction.

[0087] In contrast, Figure 3 and Figure 4 The oil seal 33 shown does not have two metal arc members 100 embedded in the rubber portion. Therefore, the oil seal 33 is easily elastically deformed in the radial direction.

[0088] Even if the force-applying portion 52 is elastically deformed in the radial direction and displaced in the axial direction, the first relay portion 64 can contact the side surface (the first side surface 76 or the second side surface 77) of the second seal groove 72. The force-applying portion 52 is restricted in position by the side surface of the groove 71, and the overall posture of the oil seal 33 is difficult to be damaged. Therefore, the lip portion 55 can contact the labyrinth ring 31 while maintaining a desired interference.

[0089] When there is no gap between the first relay portion 64 and the side surface (the first side surface 76 or the second side surface 77) adjacent to the first relay portion 64, and the axial width dimension of the first extension portion 61 is equal to or larger than the axial dimension of the second seal groove 72, the force applying portion 52 may be constrained by the side surface. In this case, it is difficult for the force applying portion 52 to elastically deform the lip portion 55 in the radial direction to follow the labyrinth ring 31.

[0090] However, in Figure 3 and Figure 4 In the illustrated embodiment, a gap is provided between the first relay portion 64 and the side surface adjacent to the first relay portion 64. When the inner ring 11 and the labyrinth ring 31 move relative to each other in the axial direction, the first relay portion 64 contacts the side surface. By providing such a gap, the force applying portion 52 is less likely to be constrained by the side surface, and the lip portion 55 easily follows the labyrinth ring 31, and the sealing performance is not reduced.

[0091] exist Figure 3 In the embodiment shown, the biasing portion 52 has a third extension portion 63. The third extension portion 63 extends radially outward and axially to the first side from the second intermediate portion 65, which is the radially outer portion of the second extension portion 62. This structure can increase the range in which the oil seal 33 can elastically deform in the radial direction.

[0092] 〔other〕

[0093] The fixing portion 51 of the oil seal 33 may be provided with a gap between the first side surface 76 and the second side surface 77 of the second seal groove 72, but the fixing portion 51 may be provided on both sides of the axial direction so as to be in contact with both the first side surface 76 and the second side surface 77. In this case, the fixing portion 51 has a function of preventing the oil seal 33 from rotating.

[0094] The form of the lip 55 can be changed, and may be a form other than the one shown in the figure.

[0095] 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.

[0096] Description of Reference Numerals

[0097] 3 Pestle Roller

[0098] 4 Small diameter shaft

[0099] 5 large diameter part

[0100] 10 Rolling bearing device

[0101] 11 Inner Circle

[0102] 11c Inner ring raceway

[0103] 12 Outer ring device

[0104] 13 Roller

[0105] 14 Axle Box

[0106] 15 Outer ring

[0107] 15c Outer ring raceway

[0108] 31 Maze Ring

[0109] 32 Sealing ring

[0110] 33 Oil seal

[0111] 51 Fixed part

[0112] 52 Force application

[0113] 53 First Lip

[0114] 54 Second Lip

[0115] 55 Lips

[0116] 61 First extension

[0117] 62 Second extension

[0118] 63 Third extension

[0119] 64 First Relay Department

[0120] 65 Second Relay Department

[0121] 66 Third Relay Department

[0122] 71 First sealing groove

[0123] 72 Second sealing groove

[0124] 76 First side

[0125] 77 Second side

[0126] 78 Slot bottom

[0127] E1, E2, E3, E4, E5 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 sealing ring, 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 comprises 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 for installing the sealing ring and a second sealing groove for installing the oil seal are provided on the outer periphery of the inner ring. The second sealing groove has an annular first side surface, an annular second side surface opposite to the first side surface in the axial direction, and a groove bottom surface arranged between the first side surface and the second side surface. The oil seal has: A fixing portion, arranged along the bottom surface of the groove; a lip in contact with the labyrinth ring; and a force applying portion, disposed between the fixing portion and the lip portion, The force applying portion has: A first extending portion extending from the fixing portion to the outside in a radial direction and to a first side in an axial direction; and The second extension portion extends from the radially outer portion of the first extension portion, namely the intermediate portion, to the radially outer side and the second axial side. The entire first extension portion and at least a portion of the second extension portion are provided between the first side surface and the second side surface, and the relay portion can be in contact with a side surface adjacent to the relay portion among the first side surface and the second side surface.

2. The rolling bearing device according to claim 1, wherein: A gap is provided between the relay portion and a side surface adjacent to the relay portion, and when the inner ring and the labyrinth ring move relative to each other in the axial direction, the relay portion contacts the side surface.

3. The rolling bearing device according to claim 1 or 2, wherein: The biasing portion includes a third extending portion extending from a second intermediate portion which is a radially outer portion of the second extending portion toward the radially outer side and toward the first side in the axial direction. The lip portion extends from a radially outer portion of the third extension portion toward the labyrinth ring.

Images