CN107420434B

CN107420434B - Bearing device and sealing device

Info

Publication number: CN107420434B
Application number: CN201710235540.1A
Authority: CN
Inventors: 杉孝时; 丸野航
Original assignee: JTEKT Corp
Current assignee: JTEKT Corp
Priority date: 2016-04-14
Filing date: 2017-04-12
Publication date: 2020-10-16
Anticipated expiration: 2037-04-12
Also published as: KR102278481B1; JP2017190835A; CN107420434A; JP6710566B2; KR20170117882A; DE102017107843A1

Abstract

Bearing devices and sealing devices are provided. The bearing device (7) comprises: a bearing body (10) having an inner ring (11) fitted from the outside to the small-diameter shaft portion (4) of the pestle roller (3), a cylindrical outer ring member (12), a cylindrical roller (13), and a shaft housing (14); and a sealing structure body (30) for preventing water from entering from the outside. The seal structure body (30) has: a labyrinth ring (31) a part of which is fitted to a recessed circumferential groove (6) formed in the large diameter portion (5) of the roller (3) so as to form a labyrinth gap; and a pad (51) attached to the axial side portion (16) of the inner ring (11), contacting a portion of the roller (3), and preventing water from entering from the outside into a portion between the inner ring (11) and the roller (3). In the axial side portion, a sealing device to prevent water from entering the portion from the outside, the bearing device enabling the roller to rotate relative to the shaft housing, the sealing device comprising: a main body portion attached to an attachment groove formed in the axial side portion; a contact portion, on the roller side of the main body portion, capable of contacting a portion of the roller.

Description

Bearing device and sealing device

Technical Field

The present invention relates to a bearing device that supports a pestle-shaped roller(s) in such a manner that the roller(s) can rotate, and to a sealing device provided in this bearing device. Note that the pestle shape here means a cylindrical shape with a narrowed central portion.

Background

For a drive roller of a continuous casting machine used in a steel making process, as shown in fig. 11, in order to suppress deflection of a pestle-shaped roller caused by a heavy load, a configuration is adopted in which a small-diameter shaft portion 91 at the center of a roller 90 is supported by a bearing device 99. To obtain such a configuration, the inner ring 95, the outer ring member 94, the shaft housing 93, and the like provided in the bearing device 99 each have a structure that can be separated into two.

A coolant is poured on the bearing device 99 for the continuous casting machine. Therefore, in order to prevent the coolant from entering the bearing interior and the like from a position between the bearing device 99 and the large diameter portion 92 of the roller 90, the bearing device 99 is provided with the labyrinth ring 98 and the oil seal 97 (see japanese patent application publication No. 2014-231876(JP2014-231876 a)). In the bearing device 99 shown in fig. 11, a packing 96 is further provided beside the oil seal 97.

Fig. 12 is a sectional view partially showing a right-side portion of the bearing device 99 shown in fig. 11. When a part of the labyrinth ring 98 enters the recessed circumferential groove 92a, the labyrinth ring 98 forms a labyrinth gap between the labyrinth ring 98 and the recessed circumferential groove 92a formed in the large diameter portion 92 of the roller 90. In this way, the labyrinth ring 98 suppresses entry of foreign matter such as coolant from the outside (into the gap 100) between the neck portion 90a of the roller 90 and the inner ring 95. At the same time, the labyrinth ring 98, the oil seal 97, and the packing 96 prevent foreign matter such as coolant from entering (in the bearing interior portion between) the inner ring 95 and the outer ring member 94 from the outside.

As shown in fig. 12, since the roller 90 (see fig. 11) rotates relative to the labyrinth ring 98 in a state of being fixed with the shaft housing 93, a gap is provided between the labyrinth ring 98 and the roller 90 (the recessed circumferential groove 92a), and the entry of the coolant can thereby be suppressed. However, the entry of the coolant cannot be completely prevented.

Therefore, the coolant may enter the gap 100 between the neck portion 90a of the roller 90 and the axial side portion 95a of the inner ring 95, and the entered coolant may accumulate in the gap 100, which becomes a cause of corrosion. If the bearing device 99 is continuously used in this state, for example, the roller 90 may be damaged from this corroded portion as a starting point.

Disclosure of Invention

In view of the above, the present invention provides: a bearing device capable of preventing corrosion by preventing water from accumulating in a gap between an inner ring and a roller; and a sealing device for preventing corrosion.

A first aspect of the present invention is a bearing device including: a bearing main body having an inner ring fitted to a small-diameter shaft portion of a pestle roller from an outside, a cylindrical outer ring member having the small-diameter shaft portion and a large-diameter portion, a plurality of rolling elements disposed on a radially outer side of the inner ring, and a shaft housing supporting the outer ring member; and a seal structure body that prevents water from entering from the outside into the inside of the bearing provided with the rolling elements and a portion between the inner ring and the roller. The seal structure body has: a labyrinth ring that is attached to the bearing main body on the radially outer side of the inner ring, a portion of which is fitted into a recessed circumferential groove formed in the large-diameter portion of the roller, and that forms a labyrinth gap between the labyrinth ring and the recessed circumferential groove; and a pad attached to an axial side of the inner ring, the pad contacting a portion of the roller, and the pad preventing the water from entering from the outside into the portion between the inner ring and the roller. The gasket has a two-piece separation structure, each of the separated gaskets including a projection projecting in an axial direction, the axial side of the inner ring having a recess recessed in the axial direction, the projection being fitted into the recess.

According to this bearing device, the spacer attached to the axial side portion of the inner ring contacts the portion of the roller, and thereby prevents water from entering from the outside into the portion between the inner ring and the roller. Therefore, it is possible to prevent the occurrence of corrosion by preventing water from accumulating in the gaps between these inner rings and the rollers.

The bearing device according to the first aspect may be configured such that: the axial side portion of the inner ring has, in order from the radially outer side: an annular surface located on a virtual surface orthogonal to a centerline of the inner ring; an arcuate surface decreasing in diameter toward an axial center; and a cylindrical surface fitted to the small-diameter shaft portion, an annular attachment groove being provided at least in the arc-shaped surface of the axial side portion of the inner ring, and the packing having: a body portion attached to the attachment groove; and a contact portion that is provided on a roller side of the main body portion and is capable of contacting the roller. The projection is provided in the main body portion, and the attachment groove has the recess. With this configuration, the configuration is such that the liner is attached to the arc-shaped surface of the inner ring, and also the configuration is such that the liner blocks water in the portion between the liner and the neck of the roller. In addition, an annular surface can be used during the machining of the inner ring.

The bearing device according to the first aspect may be configured such that: the axial side portion of the inner ring has, in order from the radially outer side: an annular attachment groove; an arcuate surface decreasing in diameter toward an axial center; and a cylindrical surface fitted to the small-diameter shaft portion, and the packing has: a body portion attached to the attachment groove; a first contact portion that is provided on a labyrinth ring side of the main body portion and that is capable of sliding contact with an inner peripheral surface of the labyrinth ring; and a second contact portion that is provided on a roller side of the main body portion and is capable of contacting the roller. With this configuration, in addition to the function of preventing water from entering from the outside into the portion between the inner ring and the roller, the packing can also have the function of preventing water from entering from the portion between the labyrinth ring and the inner ring. In other words, the one pad can have two functions of blocking water.

The above bearing device may be configured such that: the attachment groove includes: a cylindrical surface facing the radially outer side; and an annular surface facing an axially outer side, and the pad has a quadrangular cross section, an outer peripheral portion of the pad serves as the first contact portion, and an axial side portion of the pad serves as the second contact portion. In this configuration, the gasket has a simple shape, which can simplify the seal structure body. The above bearing device may be configured such that: the attachment groove has: a first groove portion on an axially outer side; and a second groove portion that is provided adjacent to the first groove portion, and a groove bottom portion of the second groove portion has a smaller diameter than that of the first groove portion, and the gasket has: the body portion fitted to the first groove portion and the second groove portion; the first contact portion provided so as to extend from the main body portion to the radially outer side; and the second contact portion provided so as to extend from the main body portion to the outside in the axial direction. In this configuration, the gasket is fitted to the first groove portion and the second groove portion, and thus a stable attached state of the gasket can be achieved.

The bearing device according to the first aspect may be configured such that: the axial side portion of the inner ring has, in order from the radially outer side: an annular attachment groove; an annular surface located on a virtual surface orthogonal to a centerline of the inner ring; an arcuate surface decreasing in diameter toward an axial center; and a cylindrical surface fitted to the small-diameter shaft portion, and the packing has: a body portion attached to the attachment groove and covering the annular surface; a first contact portion that is provided on a labyrinth ring side of the main body portion and that is capable of sliding contact with an inner peripheral surface of the labyrinth ring; and a second contact portion that is provided on a roller side of the main body portion and is capable of contacting the roller. In the case of such a configuration, the packing can have a function of preventing water from entering from the portion between the labyrinth ring and the inner ring in addition to a function of preventing water from entering from the outside into the portion between the inner ring and the roller. In other words, the one pad can have two functions of blocking water. In addition, an annular surface can be used during the machining of the inner ring.

A second aspect of the present invention is a sealing device provided in an axial side portion of an inner ring of a bearing device, thereby preventing water from entering from the outside into a portion between the inner ring and a pestle roller. The bearing device is mounted on the small diameter shaft portion of the roller so as to support the roller in such a manner that the roller is rotatable relative to the shaft housing. The sealing device has: a body portion attached to an attachment groove formed in the axial side of the inner ring; and a contact portion that is provided on a roller side of the main body portion and that is capable of contacting a portion of the roller. The sealing device has a two-piece separate structure, each of the separate sealing devices includes a projection provided in the main body portion and projecting in an axial direction, the axial side portion of the inner ring has a recess recessed in the axial direction, and the projection is fitted into the recess. This sealing means is attached to the axial side of the inner ring, contacting the portion of the roller and thereby preventing water from entering from the outside into the portion between the inner ring and the roller. Therefore, it is possible to prevent the occurrence of corrosion by preventing water from accumulating in the gaps between these inner rings and the rollers.

According to the above aspect, the spacer attached to the inner rings contacts the rollers and thereby prevents water from entering from the outside into the portions between these inner rings and the rollers. Therefore, it is possible to prevent the occurrence of corrosion by preventing water from accumulating in the gaps between these inner rings and the rollers.

Drawings

Features, advantages and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, wherein like reference numerals denote like elements, and wherein:

fig. 1 is a sectional view of one example of a bearing device including a seal structure body having a first embodiment of the invention;

FIG. 2 is a cross-sectional view of a portion of the bearing assembly and roller shown in FIG. 1;

FIG. 3 is a cross-sectional view of the liner shown in FIGS. 1 and 2;

fig. 4 is a sectional view of a modified example of the gasket shown in fig. 3;

FIG. 5 is a cross-sectional view of a portion of a bearing assembly and a roller, the bearing assembly including a seal structure body having a second embodiment;

FIG. 6 is a cross-sectional view of the liner shown in FIG. 5;

fig. 7 is a sectional view of a modified example of the gasket shown in fig. 5;

FIG. 8 is a cross-sectional view of the liner shown in FIG. 7;

FIG. 9 is a cross-sectional view of a portion of a bearing assembly and a roller, the bearing assembly including a seal structure body having a third embodiment;

FIG. 10 is a cross-sectional view of the liner shown in FIG. 9;

FIG. 11 is a cross-sectional view of a conventional bearing assembly; and is

Fig. 12 is a sectional view partially showing a right side portion of the bearing device shown in fig. 11.

Detailed Description

Embodiments of the present invention will be explained below based on drawings. Fig. 1 is a sectional view of one example of a bearing device including a seal structure body having a first embodiment of the invention. This bearing arrangement 7 supports the rolls 3 used to drive continuous casting machines used in steel making processes. The roller 3 has a small-diameter shaft portion 4 at the center and large-diameter portions 5 on both sides in the axial direction thereof in an integral manner, and the roller 3 is pestle-shaped. Since the small-diameter shaft portion 4 has a smaller diameter than the large-diameter portion 5, an annular recess is formed between the small-diameter shaft portion 4 and each of the large-

diameter portions

5, 5 of the pair, and the bearing device 7 is provided in this annular recess. Hereinafter, the boundary between the small-diameter shaft portion 4 and the large-diameter portion 5 will also be referred to as a neck portion 3a of the roller 3. The neck portion 3a has a concave curved surface shape (tapered surface shape) whose diameter gradually decreases from the large diameter portion 5 toward the small diameter shaft portion 4. An annular recessed circumferential groove 6 is formed in the inner surface of the large diameter portion 5.

The center line L0 of the roller 3 coincides with the center line L1 of the bearing device 7, and a direction parallel to the center line L1(L0) will be hereinafter defined as an axial direction. In addition, a direction orthogonal to this axial direction will be defined as a radial direction. The center line of each portion constituting the bearing device 7, such as the inner ring 11, coincides with the center line L1 of the bearing device 7. Hereinafter, the center line of the inner ring 11 will also be denoted by L1. Fig. 1 is a sectional view in a vertical plane including a center line L1 (L0). In the cross section shown in fig. 1, the bearing device 7 of this embodiment has a laterally symmetrical configuration with respect to a vertical line that divides the bearing device 7 laterally into two. A partial configuration of a right-side portion in fig. 1 will be explained below; however, the left portion (although symmetrical) has the same configuration as the right portion.

The bearing device 7 includes a bearing main body 10 and a seal structure body 30. The bearing main body 10 includes an inner ring 11, an outer ring member 12, cylindrical rollers (rolling elements) 13, and a shaft housing 14. The seal structure body 30 is provided on both the right and left sides of the bearing main body 10 and has the same configuration (although symmetrical) thereon. The seal structure body 30 includes a labyrinth ring 31, an oil seal 41, and a gasket (first gasket) 51. The seal structure body 30 shown in fig. 1 further includes a second gasket 69.

The shaft housing 14 has a two-piece split structure by which the shaft housing 14 is split vertically. More specifically, the shaft housing 14 has a base 17 fixed to a floor surface and a lid member 18 placed on this base 17, and they are coupled and fixed to each other by bolts or the like, not shown. On the upper surface side, the base 17 has a spherical seat 17a along the shape of a spherical surface.

The inner ring 11 has a two-piece split structure. More specifically, the inner ring 11 has a first inner half cylinder portion 11a and a second inner half cylinder portion 11b each having a half cylinder shape, and the separation surfaces of these inner

half cylinder portions

11a, 11b are located on a plane including the center line L1 of the inner ring 11. The inner

half cylinder portions

11a, 11b are coupled by bolts or the like, not shown, and fixed to each other, constitute an integral cylindrical member (inner ring 11), and in a state of being fitted and fixed to the small-diameter shaft portion 4 of the roller 3 from the outside. On the outer circumferential side of the inner ring 11, an inner raceway surface 11c having a cylindrical shape is provided. The inner ring 11 also has

shoulders

20, 20 on both axial sides of the inner raceway surface 11 c. The

shoulders

20, 20 each have a larger diameter than the inner raceway surface 11 c.

Fig. 2 is a sectional view partially showing a right side portion of the bearing device 7 and the roller 3 shown in fig. 1. The outer peripheral surface 20a of the shoulder portion 20 has a larger diameter than the inner raceway surface 11c, and this outer peripheral surface 20a is provided with a first outer circumferential groove 71 and a second outer circumferential groove 76. These outer

circumferential grooves

71, 76 are each annular grooves. The first outer circumferential groove 71 is a groove for attaching the oil seal 41, and the second outer circumferential groove 76 is a groove for attaching the second gasket 69.

In fig. 1, the outer ring member 12 has a cylindrical shape as a whole but has a two-piece separate structure by which the outer ring member 12 is vertically separated. More specifically, the outer ring member 12 has a first outer half-tube section 12a and a second outer half-tube section 12b each having a half-tube shape, and the separation surfaces of these outer half-

tube sections

12a, 12b are located on a plane including the center line of the outer ring member 12. Note that, in the assembled state, the center line of the outer ring member 12 coincides with the center line L1 of the inner ring 11. The outer half

tubular portions

12a, 12b are coupled and fixed to each other by bolts or the like, not shown, and constitute an integral cylindrical member (cylindrical outer ring member 12). On the inner circumferential side of the outer ring member 12, an outer raceway surface 12c having a cylindrical shape is provided. The first outer half tubular portion 12a constitutes a lower half of the outer ring member 12, and is in a state of being placed on the base 17 of the shaft housing 14. The lower surface of the first outer semi-cylindrical portion 12a has a shape corresponding to the spherical seat 17a, and serves as a placement surface to be placed on the spherical seat 17 a. The second outer half tube section 12b on the upper side is integral with the cover member 18 of the shaft housing 14.

The cylindrical rollers 13 are interposed between the inner raceway surface 11c and the outer raceway surface 12 c. In this way, the inner ring 11 and the outer ring member 12 are coaxially arranged. When the roller 3 rotates integrally with the inner ring 11, the cylindrical rollers 13 cause rolling of the inner raceway surface 11c and the outer raceway surface 12 c.

With the configuration having been described so far, by including: an inner ring 11 fitted to the small-diameter shaft portion 4 of the pestle roller 3 from the outside; a cylindrical outer ring member 12 disposed on a radially outer side of this inner ring 11; a plurality of cylindrical rollers 13 each disposed between the inner ring 11 and the outer ring member 12; and a shaft housing 14 supporting the outer ring member 12 to configure the bearing main body 10. This bearing device 7 is of the split type.

The labyrinth ring 31 is a cylindrical member but has a two-piece separation structure by which the labyrinth ring 31 is vertically separated. More specifically, the labyrinth ring 31 has a first half cylinder portion 31a and a second half cylinder portion 31b each having a half cylinder shape, and the separation surfaces of these

half cylinder portions

31a, 31b are located on a plane including the center line of the labyrinth ring 31. Note that in the assembled state, the center line of the labyrinth ring 31 coincides with the center line L1 of the inner ring 11. A first half cylinder portion 31a constituting a lower half of the labyrinth ring 31 is attached to the shaft housing 14 (base 17), and a second half cylinder portion 31b constituting an upper half of the labyrinth ring 31 is attached to the outer ring member 12 (outer half cylinder portion 12 b).

The labyrinth ring 31 on the first axial side (right side in fig. 1) protrudes from the bearing main body 10 toward the first axial side, and a part (outer axial portion 31c) of the labyrinth ring 31 is in a state of being placed in the recessed circumferential groove 6 formed in the large diameter portion 5 of the roller 3. As shown in fig. 2, when the portion (outer axial portion 31c) of the labyrinth ring 31 is in a state of being placed in the recessed circumferential groove 6, a labyrinth gap is formed between the portion (outer axial portion 31c) of the labyrinth ring 31 and the recessed circumferential groove 6, which suppresses entry of the coolant from the outside into the portion between the neck portion 3a of the roller 3 and the inner ring 11. Meanwhile, the labyrinth ring 31 on the second axial side (left side in fig. 1) protrudes from the bearing body 10 toward the second axial side, and the portion (outer axial portion 31c) of the labyrinth ring 31 is in a state of being placed in the recessed circumferential groove 6 formed in the large diameter portion 5 of the roller 3. Similarly to the first axial side, also on the second axial side, when the portion (the outer axial portion 31c) of the labyrinth ring 31 is in a state of being placed in the recessed circumferential groove 6, a labyrinth gap is formed between the portion (the outer axial portion 31c) of the labyrinth ring 31 and the recessed circumferential groove 6, which suppresses entry of the coolant from the outside into the portion between the neck portion 3a of the roller 3 and the inner ring 11. With the configuration that has been described so far, when the labyrinth ring 31 is attached to the bearing main body 10 on the radially outer side of the inner ring 11, and the portion of the inner ring 11 is placed in this recessed circumferential groove 6 formed in the large diameter portion 5 of the pestle roller 3, the labyrinth ring 31 is a member that forms a labyrinth gap between the labyrinth ring 31 and the recessed circumferential groove 6.

In fig. 2, the oil seal 41 has an annular seal main body portion 42 and a seal lip portion 43 protruding from this seal main body portion 42, and they are made of rubber. The seal body portion 42 is fitted to the first outer circumferential groove 71 of the inner ring 11. The sealing lip 43 can also contact the inner peripheral surface 32 of the labyrinth ring 31. When the roller 3 and the inner ring 11 rotate, the oil seal 41 rotates together, and the seal lip 43 comes into sliding contact with the inner peripheral surface 32 of the labyrinth ring 31. The oil seal 41 has a ring shape as a whole but is cut in a circumferential portion, which facilitates attachment of the oil seal 41 to the inner ring 11 with a separate structure. As described above, the oil seal 41 is a member that prevents the coolant from entering into the bearing interior 15 when attached to the first outer circumferential groove 71 provided on the outer circumferential side of the inner ring 11 and brought into sliding contact with the inner circumferential surface 32 of the labyrinth ring 31.

The second gasket 69 will be explained first. The second gasket 69 has an annular gasket main body portion 44 and a gasket lip portion 45 protruding from this gasket main body portion 44. The pad body portion 44 is fitted and attached to the second outer circumferential groove 76 of the inner ring 11. The packing lip 45 can contact the inner peripheral surface 32 of the labyrinth ring 31. When the roller 3 and the inner ring 11 rotate, the second packing 69 rotates together, and the packing lip 45 comes into sliding contact with the inner peripheral surface 32 of the labyrinth ring 31. The second gasket 69 may be made of rubber as a whole, but the gasket lip 45 may be made of resin to reduce contact resistance. In addition, the second pad 69 has a ring shape as a whole but is cut in a circumferential portion, which facilitates attachment of the second pad 69 to the inner ring 11 with a separate structure. As described above, the second gasket 69 is a member that prevents the coolant from entering the bearing interior 15 when attached to the second outer circumferential groove 76 provided on the outer circumferential side of the inner ring 11 and brought into sliding contact with the inner circumferential surface 32 of the labyrinth ring 31.

Before describing the first gasket 51 (hereinafter also simply referred to as gasket 51) shown in fig. 2, the shape of the axial side portion 16 of the inner ring 11 to which this gasket 51 is attached will be explained. In the embodiment shown in fig. 2, the axial side portion 16 of the inner ring 11 has, in order from the radially outer side, an annular surface 21, an arc-shaped surface 22 with a protruding cross section, and a cylindrical surface 23. The annular surface 21 is an annular surface located on a virtual surface F1 orthogonal to the center line L1 (see fig. 1) of the inner ring 11. The arc surface 22 is continuously formed from the annular surface 21 and has a protruding curved surface shape (tapered surface shape) whose diameter decreases toward the axial center (left side in fig. 2). Note that, in the embodiment shown in fig. 2, the arc surface 22 has a second annular surface 22a located between the arc surface 22 and the annular surface 21 and on a virtual surface orthogonal to the center line L1 of the inner ring 11. The protruding curved surface shape starts from this second annular surface 22 a. The cylindrical surface 23 is continuously formed from the arc surface 22, and has a cylindrical surface centered on the center line L1. In this cylindrical surface 23, the inner ring 11 is fitted to the small-diameter shaft portion 4 of the roller 3.

In the axial side 16 of the inner ring 11 having this shape, the arc surface 22 is provided with an annular attachment groove 72 for the first gasket 51. The attachment groove 72 shown in fig. 2 has: a cylindrical surface 72a facing the radially inner side; and an annular surface 72b facing axially outward and disposed in the confines of the arcuate surface 22.

Fig. 3 is a sectional view of the gasket 51 shown in fig. 1 and 2. In fig. 3, the inner ring 11 and the roller 3 are indicated by imaginary lines (two-dot chain lines). The gasket 51 has an annular main body portion 52 and an annular contact portion 53. The main body portion 52 is a portion attached to the attachment groove 72, and the contact portion 53 is a portion provided on the roller 3 side in a protruding manner from the main body portion 52. In fig. 3, the boundary between the main body portion 52 and the contact portion 53 is illustrated with a broken line. The contact portion 53 can contact the neck portion 3a of the roller 3. The packing 51 is made of rubber, and the packing 51 is elastically deformed when the contact portion 53 contacts the neck portion 3 a. In the assembled state of the bearing device 7, when the fastening rim (fastening margin) is provided in the neck portion 3a, the contact portion 53 is in a state of contact with the neck portion 3 a. When the roller 3 rotates, the inner ring 11 and the pad 51 rotate integrally with this roller 3.

Fig. 4 is a sectional view of a modified example of the gasket 51 shown in fig. 3. Note that the shape of the attachment groove 72 is the same as in the embodiment shown in fig. 3. Similar to the gasket 51 shown in fig. 3, the gasket 51 shown in fig. 4 has: a body portion 52 attached to the attachment groove 72; and a contact portion 53 provided on the roller 3 side from this main body portion 52 and capable of contacting the neck portion 3a of the roller 3. However, the pattern of the contact portions 53 is different from that shown in fig. 3. More specifically, while the contact portion 53 of the pad 51 shown in fig. 3 is provided on the roller 3 side in a protruding manner from a part of the axially outer region of the main body portion 52, the contact portion 53 of the pad 51 shown in fig. 4 is provided on the roller 3 side in a protruding manner from the entire axially outer region of the main body portion 52.

The gaskets 51 shown in fig. 3 and 4 each have a ring shape as a whole, but have a two-piece separate structure together with the inner ring 11 in this embodiment. To facilitate attachment of the detached pad 51 to the attachment groove 72 formed in the inner ring 11, the attachment groove 72 is formed with a recess 77, and thus is configured such that the protrusion 56 provided in the main body portion 52 of the pad 51 is fitted to the recess 77. The recesses 77 have an independent hole shape, a plurality of recesses 77 are formed along the attachment groove 72, and the protrusions 56 are formed on the pad 51 in a manner corresponding to the positions of these recesses 77. Note that, similar to the oil seal 41 and the second gasket 69, the first gasket 51 may be configured to be cut in a circumferential portion.

With the configuration that has been described so far, the packing 51 shown in fig. 2 to 4 is attached to the axial side portion 16 of the inner ring 11, and can prevent the coolant from entering from the outside into the portion between the inner ring 11 and the roller 3 when contacting a portion (the neck portion 3a) of the roller 3. In particular, the gasket 51 is configured to be attached to the arc-shaped surface 22 of the inner ring 11, and thus can block the coolant in the portion between the gasket 51 and the neck portion 3a of the roller 3.

In addition, in the embodiment shown in fig. 2 to 4, the attachment groove 72 is located at a position on the radially inner side from the first outer circumferential groove 71 (see fig. 2), and is configured such that the first outer circumferential groove 71 and the attachment groove 72 do not approach or align with each other in the axial direction. If it is configured such that the two

grooves

71, 72 are close to and aligned with each other in the axial direction, defective portions due to these

grooves

71, 72 increase in the axial side portion 16 of the inner ring 11, which leads to deterioration in strength. However, according to the embodiment shown in fig. 2, such strength deterioration in the axial side portion 16 can be prevented.

The liner 51 and the attachment groove 72 may each have a cross-section other than that shown in the drawing. For example, in fig. 3, the one (one) contact portion 53 is provided in a raised shape from the main body portion 52. However, a plurality of contact portions 53 may be provided. In addition, the spacer 51 may have a circular cross-sectional shape or the like, and a part thereof may be used as the contact portion 53. Further, the description has been made with respect to the case where the attachment groove 72 is formed only in the arc surface 22. However, the attachment groove 72 may be formed from the arc surface 22 to a part of the annular surface 21(22a), or may be formed from the arc surface 22 to a part of the cylindrical surface 23. In other words, the annular attachment groove 72 needs to be provided at least in the arcuate surface 22 of the axial side 16 of the inner ring 11.

In the case of the embodiment shown in fig. 2 to 4, the attachment groove 72 is formed in the axial side portion 16 (see fig. 2) of the inner ring 11, and the annular surface 21 remains located on the virtual surface F1 orthogonal to the center line L1 (see fig. 1) of the inner ring 11. This annular surface 21 can be used during the machining of the inner ring 11. More specifically, when machining the inner ring 11, the axial side 16 of this inner ring 11 is held by a magnet chuck (although not shown). During such machining, the axial side 16 of the inner ring 11 needs to have a surface (with a radius of at least a few millimeters) orthogonal to the centerline L1 for the magnet chuck. In the embodiment shown in fig. 2 to 4, since the annular surface 21 is provided on the radially outer side of the attachment groove 72, this annular surface 21 can be used for the magnet chuck. Thus, the inner ring 11 can be machined as in a conventional manner.

Fig. 5 is a sectional view of a seal structure body 30 having a second embodiment. In contrast to the seal structure body 30 shown in fig. 2, the seal structure body 30 shown in fig. 5 does not include the second gasket 69. In the embodiment shown in fig. 5, the one gasket 51 has the functions of the first gasket 51 and the second gasket 69 shown in fig. 2. Note that the remaining configuration of the bearing device 7 is the same as that in the embodiment shown in fig. 1.

Before describing the packing 51 shown in fig. 5, the shape of the axial side portion 16 of the inner ring 11 to which this packing 51 is attached will be explained. In the embodiment shown in fig. 5, the axial side portion 16 of the inner ring 11 has, in order from the radially outer side, an attachment groove 72, an arc-shaped surface 22 with a protruding cross section, and a cylindrical surface 23. The attachment groove 72 is an annular groove and is used for attaching the gasket 51. The attachment groove 72 includes an outer cylindrical surface 78 facing the radially outer side and an annular surface 79 facing the axially outer side. The arc surface 22 is continuously formed from the attachment groove 72 and has a protruding curved surface shape (tapered surface shape) whose diameter decreases toward the axial center (left side in fig. 5). Note that in the embodiment shown in fig. 5, the arc surface 22 may have a second annular surface located between the arc surface 22 and the attachment groove 72 and on a virtual surface orthogonal to the center line L1 of the inner ring 11. The protruding curved surface shape may start from this second annular surface. The cylindrical surface 23 is continuously formed from the arc surface 22, and has a cylindrical surface centered on the center line L1. In this cylindrical surface 23, the inner ring 11 is fitted to the small-diameter shaft portion 4 of the roller 3.

Fig. 6 is a sectional view of the gasket 51 shown in fig. 5. In fig. 6, the labyrinth ring 31, the inner ring 11, and the roller 3 are indicated by imaginary lines (two-dot chain lines). The gasket 51 has an annular main body portion 52, a first annular contact portion 54, and a second annular contact portion 55. The main body portion 52 is a portion attached to the attachment groove 72. The first contact portion 54 is a portion provided on the labyrinth ring 31 side in a radially protruding manner from the main body portion 52. The second contact portion 55 is a portion provided on the roller 3 side in an axially protruding manner from the main body portion 52. In fig. 6, a boundary between the main body portion 52 and the first contact portion 54 and a boundary between the main body portion 52 and the second contact portion 55 are each indicated by a broken line. The first contact portion 54 can be brought into sliding contact with the inner peripheral surface 32 of the labyrinth ring 31, and the second contact portion 55 can be brought into contact with the roller 3.

The pad 51 has a quadrangular (trapezoidal) cross section. The outer peripheral portion of the packing 51 serves as a first contact portion 54, and the axial side portion of the packing 51 serves as a second contact portion 55. The packing 51 is made of rubber, the packing 51 is elastically deformed in the radial direction when the first contact portion 54 contacts the labyrinth ring 31, and the packing 51 is elastically deformed in the axial direction when the second contact portion 55 contacts the roller 3. In the assembled state of the bearing device 7, the first contact portion 54 is in a state of contact with the labyrinth ring 31 when the fastening rim is provided in the labyrinth ring 31, and the second contact portion 55 is in a state of contact with the roller 3 when the fastening rim is provided in the roller 3. When the roller 3 rotates, the inner ring 11 and the pad 51 rotate integrally with this roller 3. While the first contact portion 54 is brought into sliding contact with the labyrinth ring 31, the second contact portion 55 and the roller 3 are brought into a contact state without a relative positional change therebetween.

In the attachment groove 72, the outer cylindrical surface 78 is a cylindrical surface centered on the center line L1 (see fig. 1) of the inner ring 11, and the annular surface 79 is inclined toward the outer cylindrical surface 78. The inclination angle K is less than 90 degrees. The main body portion 52 of the packing 51 has an inclined surface 52a which comes into surface contact with this inclined annular surface 79. With this structure, the spacer 51 can be prevented from falling off radially outward.

Fig. 7 is a sectional view of a modified example of the gasket 51 shown in fig. 5. Similarly to the embodiment shown in fig. 5, also in the embodiment shown in fig. 7, the one gasket 51 has the functions of the first gasket 51 and the second gasket 69 shown in fig. 2.

Before describing the packing 51 shown in fig. 7, the shape of the axial side portion 16 of the inner ring 11 to which this packing 51 is attached will be explained. In the embodiment shown in fig. 7, the axial side portion 16 of the inner ring 11 has, in order from the radially outer side, an attachment groove 72, an arc-shaped surface 22 with a protruding cross section, and a cylindrical surface 23. The attachment groove 72 is an annular groove for attaching the gasket 51. The attachment groove 72 has a first groove portion 74 on the axially outer side (right side in fig. 7) and a second groove portion 75 provided on the axially central side surface of this first groove portion 74. The groove bottom of the second groove portion 75 has a smaller diameter than the first groove portion 74 (in fig. 8, the diameter D2 of the groove bottom of the second groove portion 75 < the diameter D1 of the groove bottom of the first groove portion 74). In fig. 7, the arc surface 22 is continuously formed from the attachment groove 72 and has a protruding curved surface shape (tapered surface shape) whose diameter decreases toward the axial center (left side in fig. 7). Note that, in the embodiment shown in fig. 7, the arc surface 22 has a second annular surface 22a located between the arc surface 22 and the attachment groove 72 and on a virtual surface orthogonal to the center line L1 of the inner ring 11. The protruding curved surface shape starts from this second annular surface 22 a. The cylindrical surface 23 is continuously formed from the arc surface 22, and has a cylindrical surface centered on the center line L1. In this cylindrical surface 23, the inner ring 11 is fitted to the small-diameter shaft portion 4 of the roller 3.

Fig. 8 is a sectional view of the gasket 51 shown in fig. 7. In fig. 8, the labyrinth ring 31, the inner ring 11, and the roller 3 are indicated by imaginary lines (two-dot chain lines). The gasket 51 has an annular main body portion 52, a first annular contact portion 54, and a second annular contact portion 55. The main body portion 52 is a portion attached to the attachment groove 72. The first contact portion 54 is a portion provided on the labyrinth ring 31 side in a radially protruding manner from the main body portion 52. The second contact portion 55 is a portion provided on the roller 3 side in an axially protruding manner from the main body portion 52. In fig. 8, a boundary between the main body portion 52 and the first contact portion 54 and a boundary between the main body portion 52 and the second contact portion 55 are each indicated by a broken line. The first contact portion 54 can be brought into sliding contact with the inner peripheral surface 32 of the labyrinth ring 31, and the second contact portion 55 can be brought into contact with the roller 3.

The gasket 51 will be further described. The gasket 51 has: the body portion 52 fitted to the first groove portion 74 and the second groove portion 75; a first contact portion 54 on a radially outer side from the main body portion 52; and a second contact portion 55 provided so as to extend from the main body portion 52 to the axial outside. The packing 51 is made of rubber, the packing 51 is elastically deformed in the radial direction when the first contact portion 54 contacts the labyrinth ring 31, and the packing 51 is elastically deformed in the axial direction when the second contact portion 55 contacts the roller 3. In the assembled state of the bearing device 7, the first contact portion 54 is in a state of contact with the labyrinth ring 31 when the fastening rim is provided in the labyrinth ring 31, and the second contact portion 55 is in a state of contact with the roller 3 when the fastening rim is provided in the roller 3. When the roller 3 rotates, the inner ring 11 and the pad 51 rotate integrally with this roller 3. While the first contact portion 54 is brought into sliding contact with the labyrinth ring 31, the second contact portion 55 is brought into contact with the roller 3 without a relative positional change therebetween.

The gaskets 51 shown in fig. 5 to 8 each have a ring shape as a whole, and may have a two-piece separate structure together with the inner ring 11. However, in this embodiment, each gasket 51 has a configuration cut in a circumferential portion, similar to the oil seal 41.

As has been described so far, the spacers 51 shown in fig. 5 to 8 are each attached to the axial side portion 16 of the inner ring 11, and can prevent the coolant from entering from the outside into the portion between the inner ring 11 and the roller 3 when contacting a portion (large diameter portion 5) of the roller 3. Further, in addition to the function of preventing the coolant from entering from the outside into the portion between the inner ring 11 and the roller 3, the gaskets 51 can also each have the function of preventing the coolant from entering from the portion between the labyrinth ring 31 and the inner ring 11. In other words, the one gasket 51 can have two coolant blocking functions. Compared with the embodiment shown in fig. 2, the pad 69 is not provided, and thus the number of components is reduced. In addition, in the embodiment shown in fig. 6, as described above, the pad 51 has a quadrangular (trapezoidal) cross section. Accordingly, the packing 51 has a simple shape, which can simplify the seal structure body 30. In the embodiment shown in fig. 8, the main body portion 52 of the pad 51 is fitted to the first groove portion 74 and the second groove portion 75 having a stepped shape. Therefore, a stable attached state of the pad 51 can be achieved, and its falling-off can be suppressed.

Fig. 9 is a sectional view of a seal structure body 30 having a third embodiment. In contrast to the seal structure body 30 shown in fig. 2, the seal structure body 30 shown in fig. 9 does not include the second gasket 69. In the embodiment shown in fig. 9, the one gasket 51 has the functions of the first gasket 51 and the second gasket 69 shown in fig. 2. Note that the remaining configuration of the bearing device 7 is the same as that in the embodiment shown in fig. 1.

Before describing the packing 51 shown in fig. 9, the shape of the axial side portion 16 of the inner ring 11 to which this packing 51 is attached will be explained. In the embodiment shown in fig. 9, the axial side portion 16 of the inner ring 11 has, in order from the radially outer side, an attachment groove 72, an annular surface 24, an arc-shaped surface 22 with a protruding cross section, and a cylindrical surface 23. The attachment groove 72 is an annular groove for attaching the gasket 51. The annular surface 24 is an annular surface located on a virtual surface F2 orthogonal to the center line L1 (see fig. 1) of the inner ring 11. The arc surface 22 is continuously formed from the annular surface 21 and has a protruding curved surface shape (tapered surface shape) whose diameter decreases toward the axial center (left side in fig. 9). The cylindrical surface 23 is continuously formed from the arc surface 22, and has a cylindrical surface centered on the center line L1. In this cylindrical surface 23, the inner ring 11 is fitted to the small-diameter shaft portion 4 of the roller 3.

Fig. 10 is a sectional view of the gasket 51. In fig. 10, the labyrinth ring 31, the inner ring 11, and the roller 3 are indicated by imaginary lines (two-dot chain lines). The gasket 51 has an annular main body portion 52, a first annular contact portion 54, and a second annular contact portion 55. The body portion 52 is a portion that is attached to the attachment groove 72 and covers the annular surface 24 in the axial direction. The first contact portion 54 is a portion provided on the labyrinth ring 31 side in a radially protruding manner from the main body portion 52. The second contact portion 55 is a portion provided on the roller 3 side in an axially protruding manner from the main body portion 52. In fig. 10, a boundary between the main body portion 52 and the first contact portion 54 and a boundary between the main body portion 52 and the second contact portion 55 are each indicated by a broken line. The first contact portion 54 can be brought into sliding contact with the inner peripheral surface 32 of the labyrinth ring 31, and the second contact portion 55 can be brought into contact with the roller 3.

The packing 51 is made of rubber, the packing 51 is elastically deformed in the radial direction when the first contact portion 54 contacts the labyrinth ring 31, and the packing 51 is elastically deformed in the axial direction when the second contact portion 55 contacts the roller 3. In the assembled state of the bearing device 7, the first contact portion 54 is in a state of contact with the labyrinth ring 31 with the fastening rim provided in the labyrinth ring 31, and the second contact portion 55 is in a state of contact with the roller 3 with the fastening rim provided in the roller 3. When the roller 3 rotates, the inner ring 11 and the pad 51 rotate integrally with this roller 3. While the first contact portion 54 is brought into sliding contact with the labyrinth ring 31, the second contact portion 55 and the roller 3 are brought into a contact state without a relative positional change therebetween.

The gasket 51 shown in fig. 9 and 10 has a ring shape as a whole, and may have a two-piece separate structure together with the inner ring 11. However, in this embodiment, each of the gaskets 51 has a configuration cut in a circumferential portion, similar to the oil seal 41.

As has been described so far, this spacer 51 is attached to the axial side portion 16 of the inner ring 11, and can prevent the coolant from entering from the outside into the portion between the inner ring 11 and the roller 3 when contacting the portion (large diameter portion 5) of the roller 3. Further, in addition to the function of preventing the coolant from entering from the outside into the portion between the inner ring 11 and the roller 3, the gaskets 51 can also each have the function of preventing the coolant from entering from the portion between the labyrinth ring 31 and the inner ring 11. In other words, the one gasket 51 can have two coolant blocking functions. Compared with the embodiment shown in fig. 2, the pad 69 is not provided, and thus the number of components is reduced.

Note that, in the embodiment shown in fig. 9 and 10, the annular surface 24 on the virtual surface F2 orthogonal to the center line L1 (see fig. 1) of the inner ring 11 is further formed at the same time as the attachment groove 72 is formed in the axial side portion 16 of the inner ring 11. This annular surface 24 can be used during the machining of the inner ring 11. More specifically, when the inner ring 11 is machined, the axial side 16 of this inner ring 11 is held by a magnet chuck (although not shown). During such machining, the axial side 16 of the inner ring 11 needs to have a surface (with a radius of at least a few millimeters) orthogonal to the centerline L1 for the magnet chuck. In the case of the embodiment shown in fig. 9 and 10, since the annular surface 24 is provided on the radially inner side of the attachment groove 72, this annular surface 24 can be used for a magnet chuck. Thus, the inner ring 11 can be machined as in a conventional manner.

As has been described so far, the bearing device 7 includes the bearing main body 10 and the seal structure body 30. A bearing body 10 (see fig. 1) is mounted on the small-diameter shaft portion 4 of the pestle roller 3 to support this roller 3 in such a manner that the roller 3 can rotate relative to the shaft housing 14. The seal structure body 30 has a labyrinth ring 31, an oil seal 41, and a packing 51. According to this seal structure body 30, it is possible to prevent the coolant from entering from the outside into the bearing interior 15 where the cylindrical rollers 13 are provided and the portion between the inner ring 11 and the roller 3. More specifically, the oil seal 41 provided in the axial side portion 16 of the inner ring 11 contacts the labyrinth ring 31 and thereby prevents coolant from entering the bearing interior 15. Furthermore, the gasket 51 attached to the axial side 16 of the inner ring 11 contacts the portion of the roller 3 and thereby prevents coolant from entering from the outside into the portion between the inner ring 11 and the roller 3. As a result, it is possible to prevent the occurrence of corrosion by preventing the coolant from accumulating in the gap 80 between the inner ring 11 and the roller 3.

The embodiments that have been disclosed thus far are illustrative and not restrictive in all respects. In other words, the bearing arrangement and the sealing arrangement of the invention are not limited to the described embodiments but may have other embodiments within the scope of the invention. In this embodiment, the bearing arrangement 7 has been described as supporting a roll 3 for driving a continuous casting machine. However, in order to prevent foreign matter such as water from entering into the gap between the roller and the inner ring, a bearing device 7 having each of the above configurations for another purpose may be used. In addition, although the gasket 51 may be entirely formed of rubber of the same material, the gasket 51 may be formed of various types of materials. For example, although the main body portion 52 is made of rubber, the contact portions (53, 54, 55) may each be a member (e.g., a resin member) with a smaller friction coefficient than the main body portion 52.

Claims

1. A bearing device, comprising:

a bearing body (10) having: an inner ring (11), the inner ring (11) being fitted to a small-diameter shaft portion of a pestle roller having the small-diameter shaft portion and a large-diameter portion from the outside; a cylindrical outer ring member (12), the cylindrical outer ring member (12) being disposed on a radially outer side of the inner ring; a plurality of rolling elements (13), the plurality of rolling elements (13) being disposed between the inner ring and the outer ring member; and a shaft housing (14), the shaft housing (14) supporting the outer ring member; and

a seal structure body (30), the seal structure body (30) preventing water from entering from the outside into a bearing interior (15) provided with the rolling elements and a portion between the inner ring and the roller, wherein

The seal structure body has:

a labyrinth ring (31), the labyrinth ring (31) being attached to the bearing main body on the radially outer side of the inner ring, a portion of the labyrinth ring (31) being fitted into a recessed circumferential groove formed in the large-diameter portion of the roller, and the labyrinth ring (31) forming a labyrinth gap between the labyrinth ring and the recessed circumferential groove; and

a pad (51), the pad (51) being attached to an axial side (16) of the inner ring, the pad (51) contacting a portion of the roller, and the pad (51) preventing the water from entering from the outside into the portion between the inner ring and the roller, wherein

The packing (51) has a two-piece separation structure, each of the separated packing (51) includes a protrusion (56) protruding in an axial direction, the axial side portion (16) of the inner ring (11) has a recess (77) recessed in the axial direction, and the protrusion (56) is fitted into the recess (77).

2. The bearing device of claim 1, wherein

The axial side (16) of the inner ring (11) has, in succession from the radially outer side: an annular surface located on a virtual surface orthogonal to a centerline of the inner ring; an arcuate surface (22), the diameter of the arcuate surface (22) decreasing toward the axial center; and a cylindrical surface (23), the cylindrical surface (23) being fitted to the small-diameter shaft portion,

an annular attachment groove (72) is provided at least in the arcuate surface of the axial side of the inner ring,

the gasket has: a body portion (52) attached to the attachment groove; and a contact portion (53), the contact portion (53) being provided on a roller side of the main body portion, and the contact portion (53) being capable of contacting the roller, and

the protrusion (56) is provided in the main body portion (52), and the attachment groove (72) has the recess (77).

3. A sealing device provided in an axial side portion of an inner ring of a bearing device mounted on a small-diameter shaft portion of a roller so as to support the roller in such a manner that the roller is rotatable relative to a shaft housing, thereby preventing water from entering from the outside into a portion between the inner ring and a pestle roller, the sealing device comprising:

a body portion attached to an attachment groove formed in the axial side of the inner ring; and

a contact portion that is provided on a roller side of the main body portion and that is capable of contacting a part of the roller, wherein

The sealing device has a two-piece separate structure, each of the separate sealing devices includes a projection (56) provided in the main body portion (52) and projecting in an axial direction, the axial side portion (16) of the inner ring (11) has a recess (77) recessed in the axial direction, and the projection (56) is fitted into the recess (77).