KR20170117882A - Bearing device and sealing device - Google Patents

Abstract

The bearing device 7 includes an inner ring 11 fitted to the small diameter shaft portion 4 of the pellet roll 3 from the outside, a cylindrical outer race member 12, a cylindrical roller 13, a shaft housing 14 A bearing body 10 having a bearing surface 10a; And a sealing structure 30 for preventing water from entering from the outside. The sealing structure 30 includes a labyrinth ring 31 partially fitted in the concave peripheral groove 6 formed in the large diameter portion 5 of the roll 3 to form a labyrinth gap, And has a packing 51 that is attached to the axial side portion 16 of the roll 3 and contacts a part of the roll 3 and prevents water from entering the portion between the inner ring 11 and the roll 3 from the outside have.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bearing device,

The present invention relates to a bearing device for rotatably supporting a pellet roll and a sealing device provided in the bearing device. The pillar shape in the present application means a cylindrical shape having a narrow central portion.

In the drive roll of the continuous casting machine used in the steelmaking process, as shown in Fig. 11, the small diameter shaft portion 91 at the center of the roll 90 is fixed to the bearing device (Not shown) is used. In order to achieve this configuration, the inner ring 95, the outer ring member 94, the shaft housing 93, and the like provided on the bearing device 99 are each divided into two parts.

Coolant is poured into the bearing device 99 used in the continuous casting machine. The bearing device 99 is provided with the labyrinth ring 98 and the oil seal 98 to prevent the coolant from entering into the bearing from the position between the bearing device 99 and the large diameter portion 92 of the roll 90. [ 97) is provided (see Japanese Patent Application Laid-Open No. 2014-231876 (JP 2014-231876 A)). In the bearing device 99 shown in Fig. 11, a packing 96 is provided in addition to the oil seal 97.

12 is a sectional view partially showing the right portion of the bearing device 99 shown in Fig. The labyrinth ring 98 has a concave peripheral groove 92a and a labyrinth rim 92a when a part of the labyrinth ring 98 is drawn into the concave peripheral groove 92a formed in the large diameter portion 92 of the roll 90. [ And a labyrinth gap is formed between the ring (98). Thus, the labyrinth ring 98 suppresses foreign matter such as a coolant from entering the space between the neck portion 90a of the roll 90 and the inner ring 95 (gap 100) from the outside. On the other hand, the labyrinth ring 98, the oil seal 97 and the packing 96 prevent a foreign matter such as a coolant from entering the space between the inner ring 95 and the outer ring member 94 .

The roll 90 (see FIG. 11) rotates with respect to the labyrinth ring 98 that is in a fixed state together with the shaft housing 93, so that the labyrinth ring 98 and the roll 90 (The recessed perimeter groove 92a) is provided between the recessed portion 90 and the recessed portion 90, whereby the entrainment of the coolant can be suppressed. However, it is not possible to completely prevent the inflow of the coolant.

The coolant is drawn into the gap 100 between the neck portion 90a of the roll 90 and the axial side portion 95a of the inner ring 95 and the drawn coolant is accumulated in the gap 100 , Which causes corrosion. If the bearing device 99 continues to be used in this state, there is a likelihood that the corroded portion will become a starting point and damage the roll 90, for example.

In view of the above, the present invention provides a bearing device capable of preventing the occurrence of corrosion by preventing accumulation of water in the gap between the inner ring and the roll; A sealing device for preventing the occurrence of corrosion is provided.

According to a first aspect of the present invention, there is provided an inner ring sandwiched between a small-diameter shaft portion of a pellet-like roll from the outside, wherein the pellet roll has an inner ring having a small diameter shaft portion and a large diameter portion, A bearing body having a plurality of rolling elements provided between the inner ring and the outer ring member, and a shaft housing for supporting the outer ring member; And a sealing structure for preventing water from entering from the outside into the bearing provided inside the rolling element and between the inner ring and the roll. Wherein the sealing structure is attached to the bearing body at a radially outer side of the inner ring and is partially fitted in a concave peripheral groove formed in a large diameter portion of the roll, and between the concave peripheral groove and the labyrinth ring, A labyrinth ring to form a labyrinth ring; And a packing attached to an axial side portion of the inner ring and contacting a portion of the roll and preventing water from entering the portion between the inner ring and the roll from the outside.

According to this bearing device, the packing attached to the axially lateral portion of the inner ring makes contact with a part of the roll to prevent water from entering the portion between the inner ring and the roll from the outside. Therefore, it is possible to prevent the accumulation of water in the gaps between the inner and the rolls, thereby preventing the occurrence of corrosion.

The bearing device according to the first aspect is characterized in that the bearing device comprises: a ring-shaped surface in which an axial side portion of the inner ring is located in a virtual plane orthogonal to the centerline of the inner ring, in order from the radially outer side; An arc surface whose diameter decreases toward the axial center; And an annular mounting groove is provided on at least the arc surface of the axial side portion of the inner ring, the packing including a main body attached to the mounting groove, And a contact portion provided on the roll side and capable of contacting the roll. According to this configuration, the packing is configured to be attached to the arc surface of the inner ring, and the packing is configured to stop the water at the portion between the packing and the neck of the roll. Further, the annular surface can be utilized at the time of processing the inner ring.

The bearing device according to the first aspect is characterized in that the axial side portion of the inner ring has an annular fitting groove in order from the radially outer side; An arc surface whose diameter is reduced toward the axial center; And a cylindrical surface that is fitted to the small diameter shaft portion, wherein the packing has a body portion attached to the attachment groove; A first contact portion provided on the labyrinth ring side of the main body portion and capable of sliding contact with the inner peripheral surface of the labyrinth ring; And a second contact portion provided on the roll side of the main body portion and capable of contacting the roll. According to this configuration, the packing can also have a function of preventing water from being drawn in from the portion between the labyrinth ring and the inner ring, in addition to the function of preventing water from entering from the outside to the portion between the inner ring and the roll. That is, one packing may have two functions to stop the water.

The bearing device includes: a cylindrical surface having an attachment groove facing radially outward; The outer periphery of the packing acts as a first contact, and the axial side of the packing acts as a second contact. In this configuration, since the packing has a simple shape, the sealing structure can be simplified. The bearing device is characterized in that the mounting groove has a first groove portion axially outward; And a second groove portion provided adjacent to the first groove portion and having a diameter smaller than that of the first groove portion at the bottom of the groove, the packing including a body portion sandwiched between the first groove portion and the second groove portion; A first contact portion provided to extend radially outward from the body portion; And a second contact portion provided to extend axially outward from the main body portion. In this configuration, the packing is sandwiched between the first groove portion and the second groove portion, so that the stable attachment state can be realized.

The bearing device according to the first aspect is characterized in that the axial side portion of the inner ring has an annular fitting groove in order from the radially outer side; A ring-shaped surface positioned on an imaginary plane orthogonal to the centerline of the inner ring; An arc surface whose diameter is reduced toward the axial center; A main body portion having a cylindrical surface fitted to the small diameter shaft portion, the packing being attached to the attachment groove and covering the annular surface; A first contact portion provided on the labyrinth ring side of the main body portion and capable of sliding contact with the inner peripheral surface of the labyrinth ring; And a second contact portion provided on the roll side of the main body portion and capable of contacting the roll. In this configuration, the packing may also have a function of preventing water from being introduced into a portion between the inner ring and the labyrinth ring, in addition to a function of preventing water from being introduced from the outside into the portion between the inner ring and the roll. That is, one packing may have two functions to stop the water. Further, the annular surface can be utilized at the time of processing the inner ring.

A second aspect of the present invention is a sealing device provided on an axial side of an inner ring of a bearing device to prevent water from entering the portion between the inner ring and the pellet roll from the outside. The bearing device is mounted on the small diameter shaft portion of the roll to support the roll so that the roll is rotatable relative to the shaft housing. The sealing device comprises: a main body portion attached to an attachment groove formed in an axial side portion of the inner ring; And a contact portion provided on the roll side of the main body portion and capable of contacting a part of the roll. The sealing device is attached to the axial side portion of the inner ring and contacts a part of the roll to prevent water from entering the portion between the inner ring and the roll from the outside. Therefore, it is possible to prevent the accumulation of water in the gap between these inner and the rolls, thereby preventing the occurrence of corrosion.

According to this aspect, the packing attached to the inner ring comes into contact with the roll to prevent water from entering the portion between the inner ring and the roll from the outside. Therefore, it is possible to prevent the accumulation of water in the gap between these inner and the rolls, thereby preventing the occurrence of corrosion.

BRIEF DESCRIPTION OF THE DRAWINGS The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention are described below with reference to the accompanying drawings, in which like numerals refer to like elements.
1 is a cross-sectional view of an example of a bearing device including a sealing structure having a first embodiment of the present invention.
2 is a cross-sectional view of a portion of the bearing apparatus and roll shown in Fig.
3 is a sectional view of the packing shown in Figs. 1 and 2. Fig.
4 is a cross-sectional view of a modification of the packing shown in Fig.
5 is a cross-sectional view of a portion of a bearing apparatus and roll including a sealing structure having a second embodiment.
6 is a cross-sectional view of the packing shown in Fig.
7 is a cross-sectional view of a modification of the packing shown in Fig.
8 is a cross-sectional view of the packing shown in Fig.
9 is a cross-sectional view of a portion of a bearing apparatus and a roll including a sealing structure having a third embodiment.
10 is a cross-sectional view of the packing shown in Fig.
11 is a cross-sectional view of a conventional bearing device.
12 is a sectional view partially showing a right portion of the bearing device shown in Fig.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a cross-sectional view of an example of a bearing device including a sealing structure having a first embodiment of the present invention. This bearing device 7 supports a roll 3 for driving a continuous casting machine used in a steelmaking process. The roll 3 has a small-diameter shaft portion 4 at the center and a large-diameter portion 5 on both sides in the axial direction thereof integrally, and is in the form of a pillar. Since the small diameter shaft portion 4 has a smaller diameter than the large diameter portion 5, an annular concave portion is formed between each of the large diameter portions 5 and 5 paired with the small diameter shaft portion 4, A bearing device 7 is provided. The boundary between the small diameter shaft portion 4 and the large diameter portion 5 is hereinafter also referred to as the neck portion 3a of the roll 3. The neck portion 3a has a concave 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 on the inner surface of the large diameter portion (5).

The center line L0 of the roll 3 coincides with the center line L1 of the bearing device 7 and a direction parallel to the center line L1 (L0) is hereinafter defined as the axial direction. The direction orthogonal to the axial direction is defined as a radial direction. The center line of each portion of the inner ring 11 and the like constituting the bearing device 7 coincides with the center line L1 of the bearing device 7. [ Hereinafter, the center line of the inner ring 11 is also defined as L1. 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 transversely symmetrical configuration with respect to a vertical line bisecting the bearing device 7 in a transverse direction. Hereinafter, a part of the configuration of the right part of FIG. 1 will be described, but the left part has the same configuration as the right part (although symmetrical).

The bearing device (7) includes a bearing body (10) and a sealing structure (30). The bearing body 10 includes an inner ring 11, an outer ring member 12, a cylindrical roller (rolling element) 13, and a shaft housing 14. The sealing structure 30 is provided on both left and right sides of the bearing body 10 and has the same configuration (though symmetrical) there. The sealing structure 30 includes a labyrinth ring 31, an oil seal 41, and a packing (first packing) 51. The sealing structure 30 shown in Fig. 1 further includes a second packing 69. Fig.

The shaft housing 14 has a two-part structure in which the shaft housing 14 is divided vertically. More specifically, the shaft housing 14 has a base 17 fixed to the bottom surface and a lid member 18 disposed on the base 17, which are engaged and fixed to each other by bolts or the like do. The base 17 has a spherical seating portion 17a having a shape along the spherical surface on the upper surface side.

The inner ring 11 has a two-part structure. More specifically, the inner ring 11 has a first inner semicircular tube portion 11a and a second inner semicircular tube portion 11b, each of which has a semicylindrical shape and is divided into segments of the inner semicircular tubes 11a and 11b The surface is located on a plane including the center line L1 of the inner ring 11. The inner semicircular cylindrical portions 11a and 11b are joined and fixed to each other by a bolt or the like not shown and constitute a one-piece cylindrical member (inner ring 11) And becomes a fixed state. On the outer peripheral side of the inner ring 11, a cylindrical inner raceway surface 11c is provided. The inner ring 11 also has shoulders 20 and 20 on both sides in the axial direction of the inner raceway surface 11c. The shoulders 20 and 20 each have a larger diameter than the inner raceway surface 11c.

2 is a sectional view partially showing the right portion of the bearing device 7 and the roll 3 shown in Fig. The outer circumferential surface 20a of the shoulder 20 has a larger diameter than the inner circumferential surface 11c and the outer circumferential surface 20a is provided with the first outer circumferential groove 71 and the second outer circumferential groove 76. These outer circumferential grooves 71 and 76 are 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 packing 69.

1, the outer race member 12 has a cylindrical shape as a whole, but has a two-divided structure in which the outer race member 12 is divided vertically. More specifically, the outer race member 12 has a first outer semicircular cylindrical portion 12a and a second outer semicircular cylindrical portion 12b, each of which has a semicylindrical shape, and the outer semicircular cylindrical portions 12a and 12b The dividing surface is located on a plane including the center line of the outer race member 12. [ Note that, in the assembled state, the center line of the outer race member 12 coincides with the center line L1 of the inner race 11. [ The outer semicircular cylindrical portions 12a and 12b are joined and fixed to each other by bolts or the like not shown and constitute an integral cylindrical member (cylindrical outer race member 12). On the inner circumferential side of the outer race member 12, a cylindrical outer raceway surface 12c is provided. The first outer semicircular tube portion 12a constitutes the lower half of the outer race member 12 and is disposed on the base 17 of the shaft housing 14. [ The lower surface of the first outer semicircular tube portion 12a has a shape corresponding to the spherical seating portion 17a and serves as a placement surface disposed in the spherical seating portion 17a. And the upper second semicircular cylindrical portion 12b is integral with the lid member 18 of the shaft housing 14. [

The cylindrical roller 13 is interposed between the inner raceway surface 11c and the outer raceway surface 12c. Thus, the inner ring 11 and the outer ring member 12 are disposed coaxially. When the roll 3 rotates integrally with the inner ring 11, the cylindrical roller 13 causes clouds of the inner raceway surface 11c and the outer raceway surface 12c.

In the configuration described so far, the bearing main body 10 includes: an inner ring 11 fitted into the small-diameter shaft portion 4 of the pellet roll 3 from the outside; A cylindrical outer ring member 12 provided on the radially outer side of the inner ring 11; A plurality of cylindrical rollers 13 provided between the inner ring 11 and the outer ring member 12, respectively; And a shaft housing (14) for supporting the outer race member (12). The bearing device 7 is of a split type.

The labyrinth ring 31 is a cylindrical member, but has a two-part structure in which the labyrinth ring 31 is divided vertically. More specifically, the labyrinth ring 31 has a first semicircular tube portion 31a and a second semicircular tube portion 31b each having a semicylindrical shape, and the divided surfaces of the semicircular cylindrical portions 31a, Is located on a plane including the centerline of the rinse ring (31). Note that, in the assembled state, the centerline of the labyrinth ring 31 coincides with the centerline L1 of the inner ring 11. The first semicircular tube portion 31a constituting the lower half of the labyrinth ring 31 is attached to the shaft housing 14 (base 17), and the second semicircular tube portion 31b constituting the upper half thereof is attached And is attached to the outer race member 12 (outer semicircular cylindrical portion 12b).

The labyrinth ring 31 on the first axial direction side (the right side in FIG. 1) projects from the bearing body 10 toward the first axial direction, and a part of the labyrinth ring 31 (the axial outer side portion 31c) Is placed in the concave peripheral groove (6) formed in the large diameter portion (5) of the roll (3). 2, when a part of the labyrinth ring 31 (axial outer side portion 31c) is placed in the concave peripheral groove 6, a part of the labyrinth ring 31 A labyrinth gap is formed between the outer peripheral portion 31c and the concave peripheral groove 6 so as to prevent the coolant from entering the portion between the neck portion 3a of the roll 3 and the inner ring 11 from the outside. On the other hand, the labyrinth ring 31 on the second axial direction side (left side in FIG. 1) projects from the bearing body 10 toward the second axial direction, and a part of the labyrinth ring 31 The outer side portion 31c) is disposed in the concave peripheral groove 6 formed in the large diameter portion 5 of the roll 3. When the part of the labyrinth ring 31 (the axial outer side portion 31c) is arranged in the concave peripheral groove 6 in the second axial direction side as in the first axial direction side, the labyrinth ring 31 A labyrinth gap is formed between a part (axial outer side portion 31c) of the roll 3 and the concave peripheral groove 6 so that the coolant flows from the outside into the portion between the neck portion 3a of the roll 3 and the inner ring 11 . The labyrinth ring 31 is attached to the bearing body 10 at the radially outer side of the inner ring 11 and the outer diameter of the large diameter portion 3 of the pellet roll 3 A member for forming a labyrinth gap between the labyrinth ring 31 and the concave peripheral groove 6 when a part of the inner ring 11 is disposed in the concave peripheral groove 6 formed in the concave peripheral groove 5 .

2, the oil seal 41 has an annular seal main body portion 42 and a seal lip portion 43 projecting from the seal main body portion 42, and these are made of rubber. The seal main body portion 42 is fitted in the first outer peripheral groove 71 of the inner ring 11. The seal lip portion 43 may contact the inner circumferential surface 32 of the labyrinth ring 31. When the roll 3 and the inner ring 11 are rotated, the oil seal 41 rotates together and the seal lip portion 43 comes into sliding contact with the inner peripheral surface 32 of the labyrinth ring 31. The oil seal 41 is ring-shaped as a whole, but is cut in the circumferential direction, so that the oil seal 41 can easily be attached to the inner ring 11 having the divided structure. The oil seal 41 is attached to the first outer circumferential groove 71 provided on the outer circumferential side of the inner ring 11 so as to slide on the inner circumferential surface 32 of the labyrinth ring 31, And is a member for preventing the coolant from entering into the inside of the bearing (15) when making contact.

The second packing 69 will be described first. The second packing 69 has an annular packing main body portion 44 and a packing lip portion 45 projecting from the packing main body portion 44. The packing body portion 44 is fitted and attached to the second outer peripheral groove 76 of the inner ring 11. The packing lip portion 45 can contact the inner circumferential surface 32 of the labyrinth ring 31. When the roll 3 and the inner ring 11 are rotated, the second packing 69 rotates together and the packing lip portion 45 comes into sliding contact with the inner peripheral surface 32 of the labyrinth ring 31. The second packing 69 can be made entirely of rubber, but the packing lip 45 can be made of resin to reduce the contact resistance. The second packing 69 is ring-shaped as a whole, but is cut in the circumferential direction, thereby facilitating attachment of the second packing 69 to the inner ring 11 having the divided structure. As described above, the second packing 69 is attached to the second outer circumferential groove 76 provided on the outer circumferential side of the inner ring 11, and is attached to the inner circumferential surface 32 of the labyrinth ring 31 And is a member for preventing the coolant from entering the inside of the bearing (15) when making a sliding contact.

Before describing the first packing 51 (hereinafter simply referred to as the packing 51) shown in FIG. 2, the shape of the axial side portion 16 of the inner ring 11 to which the packing 51 is attached . 2, the axial side portion 16 of the inner ring 11 includes an annular surface 21, an arc surface 22 having a protruded section, and a cylindrical surface 22 23). The annular surface 21 is an annular surface located on a virtual surface F1 perpendicular to the center line L1 of the inner ring 11 (see Fig. 1). The circular arc surface 22 is formed continuously from the annular surface 21 and has a protruded curved surface shape (tapered surface shape) whose diameter decreases toward the axial center (left side in Fig. 2). 2, the arc surface 22 is located between the arc surface 22 and the annular surface 21 and is located on a virtual plane orthogonal to the center line L1 of the inner ring 11 And has a second annular surface 22a. The protruding curved surface shape starts from this second annular surface 22a. The cylindrical surface 23 is formed continuously 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 roll 3.

Among the axial side portions 16 of the inner ring 11 having such a shape, an annular mounting groove 72 for the first packing 51 is provided on the arc surface 22. 2 has a cylindrical surface 72a facing radially inward and an annular surface 72b facing outward in the axial direction and is provided within the range of the arc surface 22 .

3 is a sectional view of the packing 51 shown in Figs. 1 and 2. Fig. In Fig. 3, the inner ring 11 and the roll 3 are indicated by imaginary lines (chain dashed lines). The packing 51 has an annular body portion 52 and an annular contacting portion 53. The body portion 52 is a portion attached to the attachment groove 72 and the contact portion 53 is a portion provided on the roll 3 side so as to protrude from the body portion 52. 3, the boundary between the main body portion 52 and the contact portion 53 is indicated by a broken line. The abutting portion 53 can contact the neck portion 3a of the roll 3. The packing 51 is made of rubber and elastically deformed when the contact portion 53 contacts the neck portion 3a. In the assembled state of the bearing device 7, the abutment portion 53 is in contact with the neck portion 3a in a state in which a tightening margin is provided in the neck portion 3a. When the roll 3 is rotated, the inner ring 11 and the packing 51 rotate integrally with the roll 3. [

4 is a cross-sectional view of a modification of the packing 51 shown in Fig. Note that the shape of the attachment groove 72 is the same as that of the embodiment shown in Fig. The packing 51 shown in Fig. 4 has a body portion 52 attached to the attachment groove 72 like the packing 51 shown in Fig. 3, And has a contact portion 53 which can be brought into contact with the neck portion 3a of the roll 3. However, the shape of the contact portion 53 is different from that shown in Fig. More specifically, the contact portion 53 of the packing 51 shown in Fig. 3 is provided on the roll 3 side so as to project from a part of the axially outer region of the body portion 52, The contact portion 53 of the packing 51 is provided on the roll 3 side so as to protrude from the entire axial outer region of the body portion 52. [

Each of the packing 51 shown in Fig. 3 and Fig. 4 is ring-shaped as a whole, but in the present embodiment, it has a two-part structure together with the inner ring 11. The recesses 77 are formed in the attachment grooves 72 in order to easily attach the divided packings 51 to the attachment grooves 72 formed in the inner ring 11, The projecting portion 56 provided on the portion 52 is fitted in the recessed portion 77. A plurality of recesses 77 are formed along the mounting groove 72 and protrusions 56 are formed in the packing 51 to correspond to the positions of the recesses 77 . The first packing 51 may be configured to be cut in the circumferential portion, like the oil seal 41 and the second packing 69.

2 to 4 are attached to the axial side portion 16 of the inner ring 11 and are provided on a part of the roll 3 (the neck portion 3a) It is possible to prevent the coolant from entering from the outside to the portion between the inner ring 11 and the roll 3 at the time of contact. Particularly, the packing 51 is configured to adhere to the arc surface 22 of the inner ring 11, and thus the coolant can be stopped at the portion between the packing 51 and the neck portion 3a of the roll 3. [

2 to 4, the attachment groove 72 is located radially inward from the first outer peripheral groove 71 (see Fig. 2), and the first outer peripheral groove 71 and the attachment grooves 72 are not aligned or aligned with each other in the axial direction. When the two grooves 71 and 72 are arranged to be close to and aligned with each other in the axial direction, the defective portion due to the grooves 71 and 72 in the axial side portion 16 of the inner ring 11 becomes large, do. However, according to the embodiment shown in Fig. 2, such a decrease in strength of the axial side portion 16 can be prevented.

The packing 51 and the attachment groove 72 may each have a cross-sectional shape other than that shown in the drawings. For example, in FIG. 3, one (one set of) contact portions 53 are provided in a raised shape from the main body portion 52. However, a plurality of contact portions 53 may be provided. In addition, the packing 51 may have a circular cross-sectional shape or the like, and a part thereof may serve as the abutting portion 53. The case where the attachment groove 72 is formed only on the arc surface 22 has been described. The attachment groove 72 may be formed from the arc surface 22 to a part of the annular surface 21 or 22a or from the arc surface 22 to a part of the cylindrical surface 23. [ That is, at least the circular arc surface 22 of the axial side portion 16 of the inner ring 11 may be provided with the annular fitting groove 72.

2 to 4, an attachment groove 72 is formed in the axial side portion 16 (see Fig. 2) of the inner ring 11, and the annular surface 21 is formed on the inner ring 11, On the imaginary plane F1 perpendicular to the center line L1 (see Fig. This annular surface 21 can be utilized at the time of processing the inner ring 11. More specifically, when machining the inner ring 11, the axial side portion 16 of the inner ring 11 is held by a magnet chuck (not shown). The axial side portion 16 of the inner ring 11 needs to have a plane perpendicular to its center line L1 (at least several millimeters in radius) for the magnet chuck. In the embodiment shown in Figs. 2 to 4, since the annular surface 21 is provided radially outwardly of the attachment groove 72, this annular surface 21 can be used for the magnet chuck. Thus, the inner ring 11 can be machined in a conventional manner.

5 is a cross-sectional view of a sealing structure 30 having a second embodiment. The sealing structure 30 shown in Fig. 5 does not include the second packing 69 as compared with the sealing structure 30 shown in Fig. In the embodiment shown in Fig. 5, one packing 51 has the functions of the first packing 51 and the second packing 69 shown in Fig. Note that the rest of the configuration of the bearing device 7 is the same as the configuration of the embodiment shown in Fig.

Before describing the packing 51 shown in Fig. 5, the shape of the axial side portion 16 of the inner ring 11 to which the packing 51 is attached will be described. 5, the axial side portion 16 of the inner ring 11 includes an attachment groove 72, a circular arc surface 22 having a protruded cross section, and a cylindrical surface 23). The attaching groove 72 is an annular groove, and is used for attaching the packing 51. The attachment groove 72 includes an outer cylindrical surface 78 facing radially outward and an annular surface 79 facing axially outward. The arc surface 22 is formed continuously 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). 5, the circular arc surface 22 is formed of a circular arc which is located between the arc surface 22 and the attachment groove 72 and which is located on a virtual plane orthogonal to the center line L1 of the inner ring 11 It may have two annular planes. The protruding curved surface shape can start from this second annular surface. The cylindrical surface 23 is formed continuously 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 roll 3.

Fig. 6 is a sectional view of the packing 51 shown in Fig. 6, the labyrinth ring 31, the inner ring 11 and the roll 3 are indicated by imaginary lines (chain double-dashed lines). The packing 51 has an annular body portion 52, a first annular contacting portion 54 and a second annular contacting 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 side of the labyrinth ring 31 so as to protrude in the radial direction from the main body portion 52. The second contact portion 55 is a portion provided on the roll 3 side so as to protrude axially from the main body portion 52. 6, the boundary between the main body portion 52 and the first contact portion 54 and the boundary between the main body portion 52 and the second contact portion 55 are shown by broken lines. The first contact portion 54 can slide on the inner circumferential surface 32 of the labyrinth ring 31 and the second contact portion 55 can contact the roll 3. [

The packing 51 has a quadrangular (trapezoid) cross section. The outer peripheral portion of the packing 51 serves as the first contact portion 54 and the axial side portion of the packing 51 serves as the second contact portion 55. [ The packing 51 is made of rubber and is elastically deformed in the radial direction when the first contact portion 54 contacts the labyrinth ring 31. When the second contact portion 55 contacts the roll 3, Lt; / RTI > The first contact portion 54 is in a state in which the first contact portion 54 is in contact with the labyrinth ring 31 in a state where a tightening margin is provided in the labyrinth ring 31 and the second contact portion 55 is in contact with the labyrinth ring 31, Is in contact with the roll 3 in a state in which the roll 3 is provided with a tightening margin. When the roll 3 is rotated, the inner ring 11 and the packing 51 rotate integrally with the roll 3. [ The first contact portion 54 is in sliding contact with the labyrinth ring 31 while the second contact portion 55 is in contact with the roll 3 without any 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 formed with respect to the outer cylindrical surface 78 There is an incline. The inclination angle K is less than 90 degrees. The body portion 52 of the packing 51 has an inclined surface 52a which is in surface contact with the inclined annular surface 79. [ With this configuration, it is possible to prevent the packing 51 from falling out radially outward.

7 is a cross-sectional view showing a modified example of the packing 51 shown in Fig. In the embodiment shown in Fig. 7, as in the embodiment shown in Fig. 5, one packing 51 has the functions of the first packing 51 and the second packing 69 shown in Fig.

Before describing the packing 51 shown in Fig. 7, the shape of the axial side portion 16 of the inner ring 11 to which the packing 51 is attached will be described. 7, the axial side portion 16 of the inner ring 11 includes an attachment groove 72, an arc surface 22 having a protruded cross section, and a cylindrical surface 23 ). The attaching groove 72 is an annular groove for attachment of the packing 51. The attachment groove 72 has a first groove 74 on the axially outer side (right side in FIG. 7) and a second groove 75 provided on the axially central side of the first groove 74. The groove bottom portion of the second groove portion 75 has a diameter smaller than that of the first groove portion 74 (the diameter D2 of the groove bottom of the second groove portion 75 is smaller than that of the first groove portion 74 The diameter of the groove bottom (D1)). 7, the arc surface 22 is formed continuously from the attachment groove 72 and has a protruded curved surface (tapered surface shape) whose diameter decreases toward the axial center (left side in Fig. 7) . 7, the circular arc surface 22 is located between the circular arc surface 22 and the attachment groove 72 and is located on the imaginary plane orthogonal to the center line L1 of the inner ring 11. In this embodiment, And has two annular surfaces 22a. The protruding curved surface shape starts from this second annular surface 22a. The cylindrical surface 23 is formed continuously 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 roll 3.

8 is a sectional view of the packing 51 shown in Fig. 8, the labyrinth ring 31, the inner ring 11 and the roll 3 are indicated by imaginary lines (chain dashed lines). The packing 51 has an annular main body portion 52, a first annular contacting portion 54 and a second annular contacting 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 side of the labyrinth ring 31 so as to protrude radially from the main body portion 52. The second contact portion 55 is a portion provided on the roll 3 side so as to protrude axially from the main body portion 52. 8, the boundary between the main body portion 52 and the first contact portion 54 and the boundary between the main body portion 52 and the second contact portion 55 are shown by broken lines. The first contact portion 54 can slide on the inner circumferential surface 32 of the labyrinth ring 31 and the second contact portion 55 can contact the roll 3. [

The packing 51 will be further described. The packing 51 includes a main body portion 52 fitted to the first groove portion 74 and the second groove portion 75, a first contact portion 54 radially outward from the main body portion 52, 52 extending outwardly in the axial direction. The packing 51 is made of rubber and is elastically deformed in the radial direction when the first contact portion 54 contacts the labyrinth ring 31. When the second contact portion 55 contacts the roll 3, Lt; / RTI > The first contact portion 54 is in contact with the labyrinth ring 31 in a state where a tightening margin is provided in the labyrinth ring 31 and the second contact portion 55 is in contact with the labyrinth ring 31 in a state in which the bearing device 7 is assembled, And is in a state in which the roll 3 is in contact with the roll 3 in a state where a tightening margin is provided. When the roll 3 is rotated, the inner ring 11 and the packing 51 rotate integrally with the roll 3. [ The first contact portion 54 is in sliding contact with the labyrinth ring 31 while the second contact portion 55 is in contact with the roll 3 without any relative positional change therebetween.

Each of the packing 51 shown in Figs. 5 to 8 is ring-shaped as a whole, and can have a two-part structure together with the inner ring 11. Fig. However, in the present embodiment, like the oil seal 41, each of the packings 51 has a configuration that is cut in the circumferential portion.

5 to 8 are respectively attached to the axial side portions 16 of the inner ring 11 and the portions of the roll 3 (the large diameter portion 5) It is possible to prevent the coolant from being introduced into the portion between the inner ring 11 and the roll 3 from the outside. The packing 51 has a function of preventing the coolant from entering from the outside to the portion between the inner ring 11 and the roll 3 and the coolant from the portion between the labyrinth ring 31 and the inner ring 11, Respectively. That is, one packing 51 may have two functions for stopping the coolant. Compared with the embodiment shown in Fig. 2, the packing 69 is not provided, and therefore the number of parts is reduced. Further, in the embodiment shown in Fig. 6, as described above, the packing 51 has a quadrangular (trapezoid) cross section. Thus, the packing 51 has a simple shape, which can simplify the sealing structure 30. [ In the embodiment shown in Fig. 8, the body portion 52 of the packing 51 is fitted into the first groove portion 74 and the second groove portion 75 of the step shape. Therefore, a stable attachment state of the packing 51 can be realized, and dropout of the packing can be suppressed.

9 is a sectional view of the sealing structure 30 having the third embodiment. The sealing structure 30 shown in Fig. 9 does not include the second packing 69 as compared with the sealing structure 30 shown in Fig. In the embodiment shown in Fig. 9, one packing 51 has the functions of the first packing 51 and the second packing 69 shown in Fig. Note that the rest of the configuration of the bearing device 7 is the same as the configuration of the embodiment shown in Fig.

Before describing the packing 51 shown in Fig. 9, the shape of the axial side portion 16 of the inner ring 11 on which the packing 51 is provided will be described. 9, the axial side portion 16 of the inner ring 11 includes an attachment groove 72, a ring-shaped surface 24, and a circular arc surface 22 having a protruded cross section in this order from the radially outer side And a cylindrical surface 23. As shown in Fig. The attaching groove 72 is an annular groove for attachment of the packing 51. The annular surface 24 is an annular surface located on a virtual plane F2 perpendicular to the center line L1 of the inner ring 11 (see Fig. 1). The arc surface 22 is formed continuously from the annular surface 21 and has a protruded curved surface shape (tapered surface shape) whose diameter decreases toward the axial center (left side in Fig. 9). The cylindrical surface 23 is formed continuously 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 roll 3.

10 is a sectional view of the packing 51. Fig. In Fig. 10, the labyrinth ring 31, the inner ring 11 and the roll 3 are indicated by imaginary lines (chain dashed lines). The packing 51 has an annular main body portion 52, a first annular contacting portion 54 and a second annular contacting portion 55. The main body portion 52 is a portion attached to the attachment groove 72 and covering the annular surface 24 in the axial direction. The first contact portion 54 is a portion provided on the side of the labyrinth ring 31 so as to protrude radially from the main body portion 52. The second contact portion 55 is a portion provided on the roll 3 side so as to protrude axially from the main body portion 52. 10, the boundary between the main body 52 and the first abutting portion 54 and the boundary between the main body 52 and the second abutting portion 55 are shown by broken lines, respectively. The first contact portion 54 can slide on the inner circumferential surface 32 of the labyrinth ring 31 and the second contact portion 55 can contact the roll 3. [

The packing 51 is made of rubber and is elastically deformed in the radial direction when the first contact portion 54 contacts the labyrinth ring 31. When the second contact portion 55 contacts the roll 3, Lt; / RTI > The first contact portion 54 is in contact with the labyrinth ring 31 in a state where a tightening margin is provided in the labyrinth ring 31 and the second contact portion 55 is in contact with the labyrinth ring 31 in a state in which the bearing device 7 is assembled, And is in a state in which the roll 3 is in contact with the roll 3 in a state where a tightening margin is provided. When the roll 3 is rotated, the inner ring 11 and the packing 51 rotate integrally with the roll 3. [ The first contact portion 54 is in sliding contact with the labyrinth ring 31 while the second contact portion 55 is in contact with the roll 3 without any relative positional change therebetween.

The packing 51 shown in Figs. 9 and 10 is ring-shaped as a whole, and can have a two-part structure together with the inner ring 11. Fig. However, in the present embodiment, like the oil seal 41, each of the packings 51 has a configuration that is cut in the circumferential portion.

As described so far, the packing 51 is attached to the axial side portion 16 of the inner ring 11, and when it comes into contact with a part of the roll 3 (the large diameter portion 5), the inner ring 11 ) And the roll (3) can be prevented from being drawn in from the outside. The packing 51 has a function of preventing the coolant from entering from the outside to the portion between the inner ring 11 and the roll 3 and also providing a coolant to the portion between the labyrinth ring 31 and the inner ring 11 It can have a function of preventing entry. That is, one packing 51 may have two functions for stopping the coolant. Compared with the embodiment shown in Fig. 2, the packing 69 is not provided, and thus the number of parts is reduced.

9 and 10, an attachment groove 72 is formed in the axial side portion 16 of the inner ring 11, but an attachment groove 72 is formed in the axial direction side portion 16 of the inner ring 11 so as to be perpendicular to the center line L1 (see Fig. 1) Note that the annular surface 24 located on the surface F2 is further formed. This annular surface 24 can be utilized at the time of processing the inner ring 11. More specifically, when machining the inner ring 11, the axial side portion 16 of the inner ring 11 is held by a magnet chuck (not shown). In this processing, the axial side portion 16 of the inner ring 11 needs to have a plane perpendicular to the center line L1 (at least several millimeters in radius) for the magnet chuck. In the case of the embodiment shown in Figs. 9 and 10, since the annular surface 24 is provided radially inward of the attachment groove 72, the annular surface 24 can be used for the magnet chuck. Thus, the inner ring 11 can be machined in a conventional manner.

As described so far, the bearing device 7 includes a bearing body 10 and a sealing structure 30. [ The bearing main body 10 (see Fig. 1) has a small diameter shaft portion 4 of the roll 3 for supporting the roll 3 so that the peculiar roll 3 can be rotated with respect to the shaft housing 14. [ Respectively. The sealing structure 30 has a labyrinth ring 31, an oil seal 41, and a packing 51. According to the sealing structure 30, it is possible to prevent the coolant from entering the bearing inner space 15 provided with the cylindrical roller 13 and the portion between the inner ring 11 and the roll 3 from the outside. More specifically, the oil seal 41 provided on the axially lateral portion 16 of the inner ring 11 contacts the labyrinth ring 31 to prevent the coolant from entering the bearing interior 15. The packing 51 attached to the axially lateral portion 16 of the inner ring 11 makes contact with a portion of the roll 3 and the coolant enters the portion between the inner ring 11 and the roll 3 from the outside . As a result, it is possible to prevent the coolant from accumulating in the gap 80 between the inner ring 11 and the roll 3, thereby preventing corrosion.

The embodiments disclosed so far are illustrative in all respects and not restrictive. That is, the bearing device and the sealing device of the present invention are not limited to the described embodiments, but may have other embodiments within the scope of the present invention. In the above embodiment, the bearing device 7 has been described for supporting the roll 3 for driving the continuous casting machine. However, in order to prevent foreign objects such as water from entering into the gap between the roll and the inner ring, the bearing device 7 having the above-described configurations may be used for other purposes. Further, although the packing 51 may be formed entirely of rubber of the same material, the packing 51 may be formed of a plurality of types of materials. For example, although the main body portion 52 is made of rubber, the contact portions 53, 54, 55 may be a member (for example, a resin member) having a smaller coefficient of friction than the main body portion 52.

Claims (7)

In a bearing device,
An inner ring (11) sandwiched between a small diameter shaft portion of a pellet roll from the outside, the pellet roll having an inner diameter (11) having a small diameter shaft portion and a large diameter portion; A cylindrical outer ring member (12) provided on a radially outer side of the inner ring; A plurality of rolling elements (13) provided between the inner ring and the outer ring member; A bearing body (10) having a shaft housing (14) for supporting the outer ring member;
(15) in which the rolling elements are provided, and a sealing structure (30) to prevent water from entering the part between the inner ring and the roll from the outside,
The sealing structure may include:
Wherein the rubber ring is attached to the bearing body at a radially outer side of the inner ring and is partially fitted in a concave peripheral groove formed in a large diameter portion of the roll to form a labyrinth gap between the labyrinth ring and the concave peripheral groove, (31)
And a packing (51) attached to an axial side portion (16) of the inner ring, the packing (51) being in contact with a part of the roll and preventing water from being introduced into the portion between the inner ring and the roll from the outside. Device. The method according to claim 1,
The axial side portion 16 of the inner ring 11 includes an annular surface 21 positioned on an imaginary plane orthogonal to the center line of the inner ring in order from the radially outer side, (22) and a cylindrical surface (23) fitted to the small diameter shaft portion,
An annular fitting groove (72) is provided at least on the arc surface of the axial side portion of the inner ring,
Wherein the packing has a body portion (52) attached to the attachment groove and a contact portion (53) provided on the roll side of the body portion and capable of contacting the roll. The method according to claim 1,
The axial side portion 16 of the inner ring 11 includes an annular fitting groove 72 in order from the radially outer side, an arc surface 22 whose diameter decreases toward the axial center, And has a cylindrical surface (23)
The packing (51) includes a main body portion (52) attached to the attachment groove, a first contact portion (54) provided on the labyrinth ring side of the main body portion and capable of sliding contact with the inner peripheral surface of the labyrinth ring, And a second contact portion (55) provided on the roll side of the main body portion and capable of contacting the roll. The method of claim 3,
The attachment groove 72 includes an outer cylindrical surface 78 facing radially outward and an annular surface 79 facing outward in the axial direction,
Wherein the packing (51) has a quadrangular cross section, the outer periphery of the packing serves as a first abutment (54), and the axial side of the packing serves as a second abutment (55). The method of claim 3,
The attachment groove 72 has a first groove portion 74 on the outer side in the axial direction and a second groove portion 75 provided adjacent to the first groove portion and having a groove bottom portion smaller in diameter than the first groove portion Including,
The packing (51) includes the main body portion (52) sandwiched between the first groove portion and the second groove portion, the first contact portion (54) provided so as to extend radially outward from the main body portion, (55) provided to extend axially outward from the body portion. The method according to claim 1,
The axial side portion 16 of the inner ring 11 includes an annular attachment groove 72, an annular surface 24 positioned on a virtual plane orthogonal to the center line of the inner ring, (22) having a diameter reduced toward the center of the direction and a cylindrical surface (23) fitted to the small diameter shaft portion,
The packing (51) comprises a body portion (52) attached to the attachment groove and covering the annular surface, a first portion (52) provided on the labyrinth ring side of the body portion and capable of sliding contact with the inner circumferential surface of the labyrinth ring And a second contact portion (55) provided on the roll side of the body portion and capable of contacting the roll. A sealing device provided on an axial side of an inner ring of a bearing device for preventing water from entering from a part between an inner ring and a pellet roll, the bearing device comprising: Wherein the sealing device is mounted on a small diameter shaft portion of the roll to support the roll,
A main body attached to an attachment groove formed in the axial side portion of the inner ring,
And a contact portion provided on a roll side of the main body portion and capable of contacting a part of the roll.

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