WO2024009459A1

WO2024009459A1 - Rolling bearing device

Info

Publication number: WO2024009459A1
Application number: PCT/JP2022/026976
Authority: WO
Inventors: 丈晴浦西
Original assignee: 株式会社ジェイテクト
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2024-01-11

Abstract

A rolling bearing device according to the present invention comprises: an inner race 11 that rotates integrally with a spool-type roll 3; an outer race 15; a plurality of rollers 13; a labyrinth ring 31 that is attached to a bearing box 17; and packing 32 that is in sliding contact with the labyrinth ring 31. The packing 32 is installed in a first seal groove 71 that is provided in the outer circumference of the inner race 11. The first seal groove 71 has a first side surface 66, a second side surface 67, and a groove bottom surface 68. The packing 32 has a cylindrical part 40 that is in sliding contact with the labyrinth ring 31, a biasing part 41 that is provided on the inside of the cylindrical part 40 in the radial direction and can elastically deform, a first protruding part 46 that is in continuous contact with the first side surface 71 in the circumferential direction, and a second protruding part 47 that is in continuous contact with the second side surface 72 in the circumferential direction. The biasing part 41 has a plurality of contact parts 42 that are intermittently provided along the circumferential direction and contact the groove bottom surface 68.

Description

rolling bearing device

The present disclosure relates to a rolling bearing device.

Patent Document 1 discloses a rolling bearing device including a punch-type roll used in a continuous casting machine. The punch-type roll has a small diameter shaft and two large diameter parts having a larger diameter than the small diameter shaft. Since the inner ring included in the rolling bearing device is attached to the small diameter shaft portion, the rolling bearing device is configured to have a two-part structure.

In the case of a continuous casting machine, cooling water and casting scale fall on the rolling bearing device. Labyrinth rings, packings, and oil seals are used in rolling bearing devices to prevent cooling water and casting scale from entering the bearing interior where multiple rollers of the rolling bearing device are present. In the case of the rolling bearing device disclosed in Patent Document 1, the labyrinth ring is attached to the axle box, and the packing and oil seal are attached to the inner ring. The packing and oil seal contact the labyrinth ring.

JP 2017-190835 Publication

The rolling bearing device is installed on the common base plate of the casting machine segment after the punch-shaped roll is assembled to the axle box and the rolling bearing. At this time, assembly errors may occur in the rolling bearing device, and various parts of the rolling bearing device may be bent due to the heat and load caused by the slab during casting. Therefore, the tightening margin at each position in the circumferential direction of the packing may be different. Therefore, as shown in FIG. 8, the packing 90 includes a cylindrical portion 91 made of resin and a biasing portion 92 made of rubber in order to have followability with respect to the labyrinth ring 100. The resin cylindrical portion 91 slides into contact with the labyrinth ring 100. The rubber biasing portion 92 is continuously provided along the inner circumference of the cylindrical portion 91 . The biasing portion 92 has a convex portion 93 that contacts a groove bottom surface 96 of the seal groove 95. The packing 90 has followability because the convex portion 93 is mainly elastically deformed.

After the rolling bearing device has been used for a long period of time, if the biasing portion 91 is greatly compressed in the radial direction, for example in a part of the circumferential direction, the convex portion 93 will be bent as shown by the two-dot chain line in FIG. This may result in a situation where the In this case, the packing 90 may not be able to exhibit sufficient followability. When the followability decreases, the tightness of the packing 90 with respect to the labyrinth ring 100 decreases, and the sealing performance between the packing 90 and the labyrinth ring 100 decreases.

Therefore, an object of the present disclosure is to provide a rolling bearing device including a packing that can improve followability.

The rolling bearing device of the present disclosure includes:
A pestle-shaped roll,
an axle box,
an inner ring that rotates integrally with the pestle-shaped roll and has an inner ring raceway;
an outer ring having an outer ring raceway facing the inner ring raceway and attached to the axle box;
a plurality of rollers disposed between the inner ring raceway and the outer ring raceway;
a labyrinth ring attached to the axle box so as to be radially opposed to an axial end of the inner ring;
a packing attached to the inner ring and slidingly in contact with the labyrinth ring;
an oil seal attached to the inner ring and slidingly in contact with the labyrinth ring;
Equipped with
The pestle-shaped roll has a small diameter shaft portion to which the inner ring is attached, and two large diameter portions having a larger diameter than the small diameter shaft portion,
A first seal groove to which the packing is attached, and a second seal groove to which the oil seal is attached are provided on the outer periphery of the inner ring, and the first seal groove has an annular first seal groove. a groove bottom surface provided between the first side surface and the second side surface; a second side surface that is annular and axially opposed to the first side surface;
The packing is
a cylindrical portion that slides into contact with the labyrinth ring;
a biasing portion provided on the radially inner side of the cylindrical portion and capable of being elastically deformed;
a first protrusion that continuously contacts the first side surface in the circumferential direction;
a second protrusion that continuously contacts the second side surface in the circumferential direction;
has
The biasing portion includes a plurality of contact portions that are provided intermittently along the circumferential direction and contact the groove bottom surface.

According to the rolling bearing device of the present disclosure, the followability of the packing to the labyrinth ring is improved.

FIG. 1 is a sectional view showing an example of a rolling bearing device. FIG. 2 is a sectional view showing a part of the first axial side of the rolling bearing device shown in FIG. 1. FIG. FIG. 3 is a sectional view illustrating the packing and the first seal groove. FIG. 4 is a sectional view of the packing. FIG. 5 is a sectional view showing a modification (1) of the packing. FIG. 6 is a sectional view showing a modified example (2) of the packing. FIG. 7 is a sectional view showing a modified example (3) of the packing. FIG. 8 is a sectional view of a conventional packing.

<Summary of embodiments of the disclosed invention>
Hereinafter, an outline of the embodiments of the invention of the present disclosure will be listed and explained.

(1) The rolling bearing device of the present disclosure includes:
A pestle-shaped roll,
an axle box,
an inner ring that rotates integrally with the pestle-shaped roll and has an inner ring raceway;
an outer ring having an outer ring raceway facing the inner ring raceway and attached to the axle box;
a plurality of rollers disposed between the inner ring raceway and the outer ring raceway;
a labyrinth ring attached to the axle box so as to be radially opposed to an axial end of the inner ring;
a packing attached to the inner ring and slidingly in contact with the labyrinth ring;
an oil seal attached to the inner ring and slidingly in contact with the labyrinth ring;
Equipped with
The pestle-shaped roll has a small diameter shaft portion to which the inner ring is attached, and two large diameter portions having a larger diameter than the small diameter shaft portion,
A first seal groove to which the packing is attached, and a second seal groove to which the oil seal is attached are provided on the outer periphery of the inner ring, and the first seal groove has an annular first seal groove. a side surface, an annular second side surface axially opposed to the first side surface, and a groove bottom surface provided between the first side surface and the second side surface;
The packing is
a cylindrical portion that slides into contact with the labyrinth ring;
a biasing portion provided on the radially inner side of the cylindrical portion and capable of being elastically deformed;
a first protrusion that continuously contacts the first side surface in the circumferential direction;
a second protrusion that continuously contacts the second side surface in the circumferential direction;
has
The biasing portion includes a plurality of contact portions that are provided intermittently along the circumferential direction and contact the groove bottom surface.

According to the rolling bearing device, the packing is interposed between the groove bottom surface and the labyrinth ring in a state where the urging portion is elastically compressed and deformed in the radial direction. By elastically compressing and deforming the biasing portion in the radial direction, the cylindrical portion follows and contacts the labyrinth ring. The contact portions of the biasing portion are provided intermittently along the circumferential direction. Therefore, for example, when the biasing part is greatly compressed in the radial direction with respect to the first seal groove, a part of the biasing part can be elastically deformed to escape in the circumferential direction. Therefore, the load on the biasing section is smaller than that of the prior art biasing section.

As described above, the packing can follow and contact the labyrinth ring, and the interference between the packing and the labyrinth ring is suppressed from becoming small.
The contact portion is provided intermittently along the circumferential direction, and the biasing portion has a range that does not come into contact with the groove bottom surface. Therefore, the first protrusion portion continuously contacts the first side surface in the circumferential direction, and the second protrusion portion continuously contacts the second side surface in the circumferential direction. Therefore, the space between the first seal groove and the packing has sealing performance.

(2) Preferably, the biasing portion has a non-contact portion that connects the two circumferentially adjacent contact portions and is not in contact with the groove bottom surface. In this case, even if the biasing part and the cylindrical part are made of different materials, the biasing part and the cylindrical part are strongly joined. In other words, the biasing section having a plurality of contact sections provided intermittently is unlikely to fall off from the cylindrical section.

(3) Preferably, the contact part has a radially outer part fixed to the cylindrical part and a radially inner part that is integral with the radially outer part, and the radially inner part is , having two support parts that extend separately from the radially outer part to both sides in the circumferential direction and contact the groove bottom surface, and a gap is formed between the two support parts and the groove bottom surface. . In this case, when a radial load is applied to the packing, the two support parts deform elastically. The packing becomes easier to elastically deform and follows the labyrinth ring.

(4) In the rolling bearing device according to (1) or (2), preferably, the contact portion includes a radially outer portion fixed to the cylindrical portion and a radially outer portion that is integral with the radially outer portion. The radially inner portion has a circumferential dimension that changes along the radial direction. In this case, a portion of the contact portion having a small circumferential dimension is likely to be elastically deformed, and the packing may easily follow the labyrinth ring.

(5) Preferably, in the rolling bearing device according to any one of (1) to (4), the inner ring is a split raceway ring, and the outer ring has a convex portion along a spherical surface on its outer circumferential side. The axle box includes a first axle box member having a concave portion along a spherical surface on which the convex portion is slidable, and a second axle box member that is combined with the first axle box member. have In this configuration, a bearing unit including an inner ring, a plurality of rollers, an outer ring, and an axle box is located on the outer circumferential side of a small-diameter shaft portion of a punch-type roll, and the punch-type roll is Supported by an axle box.

<Details of embodiments of the disclosed invention>
Embodiments of the disclosed invention will be described below.
[Overall configuration of rolling bearing device]
FIG. 1 is a sectional view showing an example of a rolling bearing device 10. As shown in FIG. The rolling bearing device 10 is a device that includes a punch-shaped roll 3 and a bearing unit 19. The bearing unit 19 includes an inner ring 11, an outer ring 15, a plurality of cylindrical rollers (rolling elements) 13, a labyrinth ring 31, a packing 32, an oil seal 33, and an axle box 14. The bearing unit 19 supports the punch type roll 3.

The punch-shaped roll 3 is used in a continuous casting machine. The punch-type roll 3 and another opposing punch-type roll sandwich and move the slab. The punch type roll 3 casts the moving slab while compressing it. The pestle-shaped roll 3 integrally includes a central small-diameter shaft portion 4 and two large-

diameter portions

5, 5 provided on both sides of the small-diameter shaft portion 4 in the axial direction. The large diameter portion 5 has a larger diameter than the small diameter shaft portion 4. The pestle-shaped roll 3 has a small diameter shaft portion 4 supported by a bearing unit 19.

In the rolling bearing device 10 of the present disclosure, in which the central axis of the pestle-shaped roll 3 and the central axis L1 of the bearing unit 19 coincide, the direction parallel to the central axis L1 is the axial direction of the rolling bearing device 10. In this disclosure, a direction parallel to the central axis L1 is simply referred to as an "axial direction."
The direction perpendicular to the central axis L1 is the radial direction of the rolling bearing device 10. In this disclosure, the direction perpendicular to the central axis L1 is simply referred to as the "radial direction."
The direction along the circle centered on the central axis L1 is the circumferential direction of the rolling bearing device 10. In this disclosure, the direction along the circle centered on the central axis L1 is simply referred to as the "circumferential direction."
The common bedplate side of the caster segment to which the axle box 17 is fixed is called the "bottom" and the opposite side is called the "top".
FIG. 1 is a sectional view taken in a plane including the central axis L1 and a vertical direction. In the cross section shown in FIG. 1, the rolling bearing device 10 has a symmetrical configuration between a first axial side and a second axial side at the axial center of the small diameter shaft portion.

The labyrinth ring 31, the packing 32, and the oil seal 33 are arranged on both sides of the rolling bearing device 10 in the axial direction. The labyrinth ring 31, packing 32, and oil seal 33 on the first axial side have the same configuration as those on the second axial side, and are arranged symmetrically.

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 a common base plate of the casting machine segment, and a second axle box member 18 placed 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 not shown. 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 an alignment ring.

The outer ring 15 has a configuration in which an alignment outer ring is divided in half along a plane including its central axis. The inner peripheral surface of the outer ring 15 has a shape along a cylindrical surface centered on the central axis L1. The inner peripheral 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 able to abut and slide on the concave and spherical inner surface 17a.

The second axle box member 18 is a member above the axle box 14. The inner peripheral surface of the second axle box member 18 has a shape along a cylindrical surface centered on the central axis L1. The inner peripheral surface of the second axle box member 18 has an outer ring raceway 18c. By aligning the center axes of the outer ring 15 and the second axle box member 18 and combining them, one outer ring track is obtained by the outer ring raceway 15c and the outer ring raceway 18c. The radius of the outer ring raceway 18c is slightly larger than the radius of the outer ring raceway 15c. The outer ring 15 is swingable relative to the first axle box member 17 in accordance with the inclination of the inner ring 11. On the other hand, the second axle box member 18 does not swing relative to the first axle box member 17.

The inner ring 11 is attached to the small diameter shaft portion 4 by being fitted onto the outside of the small diameter shaft portion 4 . The inner ring 11 rotates together with the pestle-shaped roll 3. The inner ring 11 is a two-split bearing ring. The inner ring 11 has a first inner ring segment 11a and a second inner ring segment 11b each having a semi-cylindrical shape. The dividing surfaces of these inner

ring division bodies

11a and 11b are on a plane containing the central axis of the inner ring 11. The

inner ring segments

11a and 11b are connected and fixed by bolts or the like (not shown) to form an integral cylindrical member (inner ring 11). The inner ring 11 has a cylindrical inner ring raceway 11c on its outer peripheral side. The inner ring 11 has

flanges

20, 20 having a larger diameter than the inner ring raceway 11c on both sides of the inner ring raceway 11c in the axial direction.

The inner raceway 11c and the

outer raceways

15c and 18c face 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. As the pestle-shaped roll 3 rotates 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, 18c.

FIG. 2 is a sectional view showing a part of the first axial side of the rolling bearing device 10 shown in FIG. 1. The diameter of the outer peripheral surface 20a of the collar 20 of the inner ring 11 is larger than the diameter of the inner ring raceway 11c. A first seal groove 71 and a second seal groove 72 are provided on the outer peripheral surface 20a of the collar 20. The first seal groove 71 and the second seal groove 72 are each annular grooves. The

seal grooves

71 and 72 are recessed radially inward from the outer peripheral surface 20a. The first seal groove 71 is a groove for attaching the packing 32, and the second seal groove 72 is a groove for attaching the oil seal 33.

FIG. 3 is a cross-sectional view illustrating the packing 32 and the first seal groove 71. The first seal groove 71 includes a first side surface 66 that is annular, a second side surface 67 that is annular and opposite to the first side surface 66 in the axial direction, and a first side surface 66 and a second side surface 67. and a groove bottom surface 68 provided between the groove bottom surface 68 and the groove bottom surface 68. The first side surface 66 is an annular plane extending radially inward from a portion of the outer circumferential surface 20a of the inner ring 11. The second side surface 67 is an annular plane extending radially inward from the other portion of the outer peripheral surface 20a of the inner ring 11. The groove bottom surface 68 is a cylindrical surface that extends in the axial direction from the radially inner end of the first side surface 66 and is 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, the groove bottom surface 68 may be a conical surface or a part of a torus other than the above-mentioned cylindrical surface.

[Labyrinth ring 31]
The labyrinth ring 31 (see FIG. 1) is a generally cylindrical member. 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. The dividing planes of these half-

cylindrical parts

31a and 31b lie on a plane that includes the central axis of the labyrinth ring 31. The central axis of the labyrinth ring 31 coincides with the central axis of the outer ring 15. A first half-cylindrical portion 31a constituting the lower half of the labyrinth ring 31 is attached to the first axle box member 17. The second half-cylindrical portion 31b constituting the upper half of the labyrinth ring 31 is attached to the second axle box member 18. The labyrinth ring 31 faces the axial end (flange 20) of the inner ring 11 in the radial direction.

The labyrinth ring 31 on the first axial side (the right side in FIG. 1) is provided to protrude from the axle 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 punch-shaped roll 3.
The labyrinth ring 31 on the second axial side (the left side in FIG. 1) is provided to protrude from the axle 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 punch-shaped roll 3.
A labyrinth gap is formed between a portion 31c of the labyrinth ring 31 and the concave circumferential groove 6 on both sides in the axial direction. The labyrinth gap prevents foreign matter such as cooling water from entering the bearing interior 16 from the outside.

[Oil seal 33]
In FIG. 2, the oil seal 33 includes a fixing portion 52,

lips

53, 54, and a metal ring 55. The fixing portion 52 and

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 location in the circumferential direction. The metal ring 55 has two arc-shaped metal plates. The metal rings 55 are each fixed to a portion of the fixing portion 52 on a first side in the circumferential direction from the separation location and a portion on a second side in the circumferential direction from the separation location.

The oil seal 33 is fitted into the second seal groove 72 and attached. The oil seal 33 has a ring shape as a whole when attached to the inner ring 11. Since the oil seal 33 is separated at one location in the circumferential direction, it can be attached to the inner ring 11 having a smaller diameter than the large diameter portion 5 of the punch type roll 3.
When the pestle-shaped roll 3 and the inner ring 11 rotate, the oil seal 33 rotates together with the inner ring 11. The

lip portions

53 and 54 of the oil seal 33 slide into contact with the inner peripheral surface 31d of the labyrinth ring 31.

[Packing 32]
In FIG. 3 , the packing 32 includes a cylindrical portion 40 , a biasing portion 41 , a first protrusion 46 , and a second protrusion 47 .
The cylindrical portion 40 is annular. The cylindrical portion 40 is separated at one location in the circumferential direction. With the packing 32 attached to the first seal groove 71, the separated end portions of the cylindrical portion 40 are pressed against each other in the circumferential direction. The cylindrical portion 40 is made of resin. The cylindrical portion 40 may be made of rubber instead of resin. In order to reduce the contact resistance between the cylindrical portion 40 and the labyrinth ring 31, the cylindrical portion 40 is preferably made of resin. In this embodiment, the cylindrical portion 40 is made of polytetrafluoroethylene.

FIG. 4 is a cross-sectional view of the packing 32, showing a cross section taken in the direction of the IV arrow in FIG. In FIG. 4, the groove bottom surface 68 of the first seal groove 71 is shown by a two-dot chain line. The urging section 41 has a plurality of contact sections 42 and a plurality of non-contact sections 43. The contact portions 42 and non-contact portions 43 are arranged alternately 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. Contact

portions

42 , 42 adjacent in the circumferential direction are connected by a non-contact portion 43 . Therefore, the biasing portion 41 of this embodiment has an annular shape as a whole. At one separation point in the circumferential direction where the cylindrical portion 40 separates, the biasing portion 41 is also separated in the circumferential direction. The biasing portion 41 is made of rubber and is elastically deformable.

In FIG. 3, the biasing portion 41, the first protrusion 46, and the second protrusion 47 are integrally formed. The biasing portion 41, the first protrusion 46, and the second protrusion 47 are annular. The biasing portion 41, the first protruding portion 46, and the second protruding portion 47 are separated at the same location where the cylindrical portion 40 is separated. With the packing 32 mounted in the first seal groove 71, the ends of the separated urging portion 41, first protrusion 46, and second protrusion 47 press against each other in the circumferential direction.

The biasing portion 41, the first protrusion 46, and the second protrusion 47 are made of rubber. In this embodiment, the biasing portion 41, the first protrusion 46, and the second protrusion 47 are made of fluororubber. The biasing portion 41 is fixed to the inside of the cylindrical portion 40 in the radial direction. The biasing portion 41 is bonded to the cylindrical portion 40 with, for example, an adhesive. The outer circumferential surface 40a of the cylindrical portion 40 is a cylindrical surface. A recess 40b is provided on the inner peripheral side of the cylindrical portion 40. A portion of the biasing portion 41 has entered the recess 40b. With this configuration, the cylindrical portion 40 and the biasing portion 41 are strongly joined.

The first protruding portion 46 is located on the side surface 41a of the biasing portion 41 on the first axial side. The second protruding portion 47 is located on the side surface 41b of the biasing portion 41 on the second axial side. The first protruding portion 46 is located on the first axial side of the cylindrical portion 40 and the biasing portion 41 . The second protruding portion 47 is located on the second axial side of the cylindrical portion 40 and the biasing portion 41 .

The first protrusion 46 is provided in an annular shape on the side surface 41a of the biasing portion 41. The first protrusion 46 continuously contacts the first side surface 66 in the circumferential direction. The first protruding portion 46 is located on the first side in the axial direction from the side surface 41a of the biasing portion 41. The second protruding portion 47 is provided in an annular shape on the side surface 41b of the biasing portion 41. The second protrusion 47 continuously contacts the second side surface 67 in the circumferential direction. The second protruding portion 47 is located on the second axial side of the side surface 41b of the biasing portion 41. The first protruding portion 46 and the second protruding portion 47 are integrally molded with the biasing portion 41.

The axial dimension of the cylindrical portion 40 and the axial dimension of the biasing portion 41 are the same. The axial dimension of the radially outer part 41j of the urging part 41 that includes the joint part with the cylindrical part 40, and the axial dimension of the radially inner part 41s of the urging part 41 that contacts the groove bottom surface 68. are the same. Note that 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.

The packing 32 is fitted and attached to the first seal groove 71. The packing 32 has an annular shape as a whole when attached to the inner ring 11. Since the packing 32 is separated at one point in the circumferential direction, it can be attached to the inner ring 11 having a smaller diameter than the large diameter portion 5 of the punch-shaped roll 3.
The urging portion 41 is radially compressed and elastically deformed between the cylindrical portion 40 and the groove bottom surface 68 at the contact portion 42 . The contact portion 42 presses the cylindrical portion 40 against the labyrinth ring 31 .

When the pestle-shaped roll 3 and the inner ring 11 rotate, the packing 32 rotates together with the inner ring 11. The cylindrical portion 40 slides into contact with the inner circumferential surface 31d of the labyrinth ring 31.
Packing 32 and oil seal 33 contact labyrinth ring 31. The sealing performance of the packing 32, the oil seal 33, and the labyrinth ring 31 prevents cooling water and casting scale from entering 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 the function of preventing lubricant such as grease or oil/air oil inside the bearing 16 from leaking to the outside.

As shown in FIG. 4, each contact portion 42 has a radially outer part 41j on the radially outer side and a radially inner part 41s on the radially inner side. The radially outer portion 41j is connected to the non-contact portion 43. The radially outer portion 41j is integrated with the non-contact portion 43 to form an annular shape.

A plurality of radially inner portions 41s exist in the circumferential direction. The radially inner portions 41s are provided intermittently (intermittently) in the circumferential direction. The radially inner portions 41s that are adjacent to each other in the circumferential direction are separated from each other in the circumferential direction. The radially inner portion 41s is integrated with the radially outer portion 41j. The radially inner portion 41s contacts the groove bottom surface 68.

In the form shown in FIG. 4, the radially inner portion 41s has a first support portion 44 and a second support portion 45. The first support portion 44 is provided extending from the radially outer portion 41j to the first side in the circumferential direction and radially inward. The second support portion 45 is provided extending from the radially outer portion 41j to the second side in the circumferential direction and radially inward. The tip 44 a of the first support portion 44 and the tip 45 a of the second support portion 45 contact the groove bottom surface 68 . The distal end portion 44a of the first support portion 44 and the distal end portion 45a of the second support portion 45 are separated from each other in the circumferential direction.

The state in which the packing 32 is mounted in the first seal groove 71 and the cylindrical portion 40 is in contact with the labyrinth ring 31 is referred to as the "packing 32 mounted state." When the packing 32 is attached, the first support portion 44 is compressed in the radial direction, and the tip portion 44a moves toward the first side in the circumferential direction. With the packing 32 attached, the second support portion 45 is compressed in the radial direction, and the tip portion 45a moves toward the second side in the circumferential direction. The first support part 44 and the second support part 45 are pulled apart in the circumferential direction. When the packing 32 is installed, a gap E exists between the first support portion 44 and the second support portion 45 and between the groove bottom surface 68.

A space P exists inside the non-contact portion 43 in the radial direction. When the cylindrical portion 40 is further pushed inward in the radial direction, the contact portion 42 is compressed in the radial direction and elastically deforms.
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 toward the first side (space P side) in the circumferential direction. 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 side (gap E side) in the circumferential direction.
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 side (space P side) in the circumferential direction. 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 toward the first side (gap E side) in the circumferential direction.

Furthermore, the radially inner portion 41s can expand toward the space P or the gap E. When the cylindrical portion 40 is further pushed inward in the radial direction, the contact portion 42 is compressed in the radial direction, and the radially inner portion 41s can escape into the space P or the gap E. Therefore, the cylindrical portion 40 can be easily moved in the radial direction.

When the packing 32 is installed (see FIG. 3), the first protrusion 46 contacts the first side surface 66 with an interference margin. The second protrusion 47 contacts the second side surface 67 with an interference margin. When the cylindrical portion 40 moves in the radial direction, the first protrusion 46 can move in the radial direction while remaining in contact with the first side surface 66. When the cylindrical portion 40 moves in the radial direction, the second protrusion 47 can move in the radial direction while contacting the second side surface 67.

[Modification example (1) of packing 32]
FIG. 5 is a sectional view showing a modified example (1) of the packing 32. Each of the modified examples described below differs in the form of the biasing portion 41 from the form shown in FIG. 4 . In addition, the biasing portion 41 includes a contact portion 42 and a non-contact portion 43, and a plurality of contact portions 42 are provided intermittently along the circumferential direction, and each contact portion 42 contacts the groove bottom surface 68. , the non-contact portion 43 connects the two circumferentially

adjacent contact portions

42, 42, and the non-contact portion 43 does not contact the groove bottom surface 68; They are the same in that they have a direction inner part 41s.
In the case of the embodiment shown in FIG. 4, the radially inner portion 41s contacts the groove bottom surface 68 at two locations: the first support portion 44 and the second support portion 45.

In the case of modification (1) shown in FIG. 5, the number of contact portions of the radially inner portion 41s with the groove bottom surface 68 is one. The radially inner portion 41s has a shape in which the circumferential dimension decreases from the radially outer portion 41j toward the groove bottom surface 68. According to the configuration of the contact portion 42 of the modification (1), the urging portion 41 can be easily molded (demolded).
When the cylindrical portion 40 is further pushed inward in the radial direction, the contact portion 42 is compressed in the radial direction and is elastically deformed. At this time, the radially inner portion 41s can expand toward the space P.

[Modified example (2) of packing 32]
FIG. 6 is a sectional view showing a modified example (2) of the packing 32. In the case of modification (2) shown in FIG. 6, the number of contact portions of the radially inner portion 41s with the groove bottom surface 68 is one. Modification (2) shown in FIG. 6 differs from Modification (1) shown in FIG. 5 in the form of the radially inner portion 41s. The radially inner portion 41s has a shape whose circumferential dimension increases toward the groove bottom surface 68. In the case of modification (2), since the contact area of the contact portion 42 with the groove bottom surface 68 becomes large, the packing 32 is unlikely to be displaced from the inner ring 11 in the circumferential direction.
When the cylindrical portion 40 is further pushed inward in the radial direction, the contact portion 42 is compressed in the radial direction and is elastically deformed. At this time, the radially inner portion 41s can expand toward the space P.

As described above, in the modification (1) shown in FIG. 5 and the modification (2) shown in FIG. 6, the circumferential dimension of the contact portion 42 changes along the radial direction of the contact portion 42. The contact portion 42 has, at least in part, a radially inner portion 41s whose circumferential dimension changes along the radial direction.

[Modification of packing 32 (3)]
FIG. 7 is a sectional view showing a modification (3) of the packing 32. In the case of modification (3) shown in FIG. 7, the radially inner portion 41s contacts the groove bottom surface 68 at one location. Modification (3) differs from Modification (1) and Modification (2) in the form of the radially inner portion 41s. A surface 49a on the first side in the circumferential direction of the radially inner portion 41s and a surface 49b on the second side in the circumferential direction of the radially inner portion 41s are parallel. The first side surface 49a and the second side surface 49b are parallel to the axial direction. A virtual plane is located along the radial direction at the center of the first side surface 49a and the second side surface 49b.

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

The cross-sectional shape of the contact portion 42 of the packing 32 in each of the embodiments of FIGS. 5, 6, and 7 is the same as the shape shown in FIG. 3. The packing 32 in each of the embodiments of FIGS. 5, 6, and 7 also has a first protrusion 46 and a second protrusion 47 that are annular.

[About each form of rolling bearing device 10]
As described above, the rolling bearing device 10 of each of the above embodiments includes the packing 32 that is attached to the inner ring 11 and slides into contact with the labyrinth ring 31. Each type of packing 32 includes a cylindrical portion 40 that slides into contact with the labyrinth ring 31 , a biasing portion 41 that is provided inside the radial direction of the cylindrical portion 40 and is elastically deformable, and a first portion of the first seal groove 71 . A first protrusion 46 that continuously contacts the side surface 66 in the circumferential direction; and a second protrusion 47 that continuously contacts the second side surface 67 of the first seal groove 71 in the circumferential direction. and has. The biasing section 41 has a plurality of contact sections 42 . The plurality of contact portions 42 are provided intermittently along the circumferential direction and contact the groove bottom surface 68 of the first seal groove 71 .

According to the rolling bearing device 10 including the packing 32 of each of the above-described types, the packing 32 is interposed between the groove bottom surface 68 and the labyrinth ring 31 in a state where the urging portion 41 is elastically compressed and deformed in the radial direction. The biasing portion 41 is elastically compressed and deformed in the radial direction, and a state in which the cylindrical portion 40 follows and contacts the labyrinth ring 31 is obtained. Furthermore, the contact portions 42 of the biasing portion 41 are provided intermittently along the circumferential direction. Therefore, in the first seal groove 71, even if the biasing portion 41 is largely compressed in the radial direction, a portion of the biasing portion 41 will not be elastically deformed to escape in the circumferential direction. The load on the biasing portion 41 is less than that on the packing of the conventional structure.

As described above, the packing 32 can follow and contact the labyrinth ring 31, and a decrease in the interference between them is suppressed. The contact portions 42 are provided intermittently (intermittently) along the circumferential direction, and there is a range in the biasing portion 41 that does not come into contact with the first seal groove 71 . However, the first protrusion 46 continuously contacts the first side surface 66 of the first seal groove 71 in the circumferential direction. The second protrusion 47 continuously contacts 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 packing 32 is ensured.

In each of the above-mentioned types of packing 32, the biasing portion 41 further includes a non-contact portion 43 that connects two circumferentially

adjacent contact portions

42 and 42 and does not contact the groove bottom surface 68. Therefore, the joining area between the biasing part 41 and the cylindrical part 40 expands along the circumferential direction, and even if the biasing part 41 and the cylindrical part 40 are made of different materials, they are strongly joined. In other words, the biasing part 41 having a plurality of contact parts 42 provided intermittently becomes difficult to fall off from the cylindrical part 40.

In the case of the packing 32 shown in FIG. 4, the contact portion 42 has a radially outer portion 41j fixed to the cylindrical portion 40, and a radially inner portion 41s that is integral with the radially outer portion 41j. The radially inner portion 41s has two

support portions

44 and 45. The

support portions

44 and 45 extend separately from the radially outer portion 41j on both sides in the circumferential direction and contact the groove bottom surface 78. In the case of this packing 32 in which a gap E is formed between the two

support parts

44 and 45 and the groove bottom surface 78, when a radial load is applied, the contact part 42 becomes elastic in the radial direction. Along with the deformation, the two

supports

44 and 45 also deform. The packing 32 has a larger elastically deformable size and can easily follow the labyrinth ring 31.

In the case of the packing 32 shown in FIGS. 5 and 6, the contact portion 42 has a radially outer portion 41j fixed to the cylindrical portion 40, and a radially inner portion 41s that is 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 packing 32, the contact portion 42 tends to be elastically deformed in a portion having a small circumferential dimension. Therefore, the packing 32 shown in FIGS. 5 and 6 is easier to follow than the packing 32 shown in FIG. 7.
In the embodiments shown in FIGS. 5, 6, and 7, the packing 32 can be followed by elastic deformation of the entire contact portion 42 in the radial direction.

〔others〕
The shape of contact portion 42 may vary within the scope of this disclosure. For example, in the embodiments shown in FIGS. 5 and 6, the circumferential dimension of the radially inner portion 41s changes linearly along the radial direction of the contact portion 42. In other words, the side surface of the radially inner portion 41s facing in the circumferential direction is a flat surface. As another configuration, the circumferential dimension of the radially inner portion 41s may change non-linearly along the radial direction of the contact portion 42.
Further, the packing of the rolling bearing device of the present invention may be a packing 32 that combines at least two of the contact portions 42 shown in FIGS. 4, 5, 6, and 7.

The above embodiments are illustrative in all respects and are not restrictive. The scope of rights of the present invention is indicated by the scope of the claims, not the embodiments, and includes all modifications within the scope of equivalents to the configurations described in the scope of the claims.

3 Punch-shaped roll 4 Small diameter shaft part 5 Large diameter part 10 Rolling bearing device 11 Inner ring 11c Inner ring raceway 13 Rollers 14 Axle box 15 Outer ring 15c Outer ring raceway 15d Spherical outer diameter surface (convex part)
17 First axle box member 17a Concave inner surface (concavity)
18 Second axle box member 31 Labyrinth ring 32 Packing 33 Oil seal 40 Cylinder part 41 Urging part 41j Radial outer part 41s Radial inner part 42 Contact part 43 Non-contact part 44 First support part 45 Second support Part 46 First protrusion 47 Second protrusion 66 First side surface 67 Second side surface 68 Groove bottom surface 71 First seal groove 72 Second seal groove E Gap

Claims

A pestle-shaped roll,
an axle box,
an inner ring that rotates integrally with the pestle-shaped roll and has an inner ring raceway;
an outer ring having an outer ring raceway facing the inner ring raceway and attached to the axle box;
a plurality of rollers disposed between the inner ring raceway and the outer ring raceway;
a labyrinth ring attached to the axle box so as to be radially opposed to an axial end of the inner ring;
a packing attached to the inner ring and slidingly in contact with the labyrinth ring;
an oil seal attached to the inner ring and slidingly in contact with the labyrinth ring;
Equipped with
The pestle-shaped roll has a small diameter shaft portion to which the inner ring is attached, and two large diameter portions having a larger diameter than the small diameter shaft portion,
A first seal groove to which the packing is attached, and a second seal groove to which the oil seal is attached are provided on the outer periphery of the inner ring, and the first seal groove has an annular first seal groove. a groove bottom surface provided between the first side surface and the second side surface; a second side surface that is annular and axially opposed to the first side surface;
The packing is
a cylindrical portion that slides into contact with the labyrinth ring;
a biasing portion provided on the radially inner side of the cylindrical portion and capable of being elastically deformed;
a first protrusion that continuously contacts the first side surface in the circumferential direction;
a second protrusion that continuously contacts the second side surface in the circumferential direction;
has
The biasing portion has a plurality of contact portions that are provided intermittently along the circumferential direction and that contact the groove bottom surface.
Rolling bearing device.
The rolling bearing device according to claim 1, wherein the urging portion has a non-contact portion that connects the two circumferentially adjacent contact portions and is not in contact with the groove bottom surface.
The contact portion is
a radially outer portion fixed to the cylindrical portion;
a radially inner portion that is integral with the radially outer portion;
The radially inner portion has two support portions extending separately from the radial outer portion on both sides in the circumferential direction and contacting the groove bottom surface, and between the two support portions and the groove bottom surface. A gap is formed,
The rolling bearing device according to claim 1 or 2.
The contact portion is
a radially outer portion fixed to the cylindrical portion;
a radially inner portion that is integral with the radially outer portion;
The rolling bearing device according to claim 1 or 2, wherein the radially inner portion has a circumferential dimension that changes along the radial direction.
The inner ring is a split bearing ring,
The outer ring has a convex portion along a spherical surface on its outer circumferential side,
The axle box has a first axle box member having a concave portion along a spherical surface on which the convex portion is slidable, and a second axle box member that is combined with the first axle box member.
The rolling bearing device according to claim 1 or 2.