JP2016176569A - Seal member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal member capable of improving sealing performance and lubricant discharging performance.SOLUTION: A seal member 2 includes a seal main body 21 internally fitted to a recessed groove 72 formed on an inner peripheral face of a housing 7, and a seal lip portion 22 having a contact face 22a kept into face-contact with an outer peripheral face of a rotating shaft 5 and extended to a radial inner part from the seal main body 21. A contact face 22a of the seal lip portion 22 is provided with an inner peripheral-side discharge groove 22c for discharging a lubricant in the housing 7 to the outside of the housing 7 through an inner peripheral side of the seal main body 21 at a part of an apex portion in being used. The seal main body 21 has an outer peripheral-side discharge passage 24 for discharging the lubricant in the housing 7 to the outside of the housing 7 through an outer peripheral side of the seal main body 21 at a part of an apex portion in being used.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a seal member used in a bearing device that rotatably supports a rotating shaft such as a transporting segment roll of a continuous casting machine.

  Conventionally, in a continuous casting machine, steel pieces continuously discharged from a mold are sandwiched by a plurality of pairs of opposed segment rolls and pulled downward, and then bent and transported at right angles while cooling with water. The direction is changed to the horizontal direction. Both ends of the segment roll are supported by a bearing device, and the bearing device is provided with a sealing device.

An example of the sealing device is as shown in FIG. 9 (see Patent Document 1).
As shown in FIG. 9, the both end portions 150 of the segment roll 105 are supported by a cylindrical housing 107 so as to be rotatable around a horizontal axis via a rolling bearing 106.

  The sealing device 100 includes first and second seal members 101 and 104 disposed on both axial sides of the rolling bearing 106 and an outer seal disposed on the axially outer side (right side in the drawing) of the first seal member 101. Member 130. The first seal member 101 is disposed on the roll neck 151 side of the segment roll 105, and the second seal member 104 is disposed on the roll end 152 side. By these first and second seal members 101 and 104, the annular space between the segment roll 105 and the housing 107 is partitioned from the external space S2 to become a sealed space S1.

The first seal member 101 is provided with a discharge port 115 at the upper part of the side surface, and the discharge port 115 is provided with a slit 115c that opens when a predetermined pressure is applied.
The outer seal member 130 prevents foreign matter from entering the sealed space S1 from the outside by the lip portion 131 coming into contact with the roll neck 151.

  In order to lubricate the inside of the rolling bearing 106, oil is supplied to the rolling bearing 106 together with pressurized air, for example, from the outside of the housing 107. This oil is continuously supplied to the inside of the rolling bearing 106 through an oil supply hole 170 provided in the lower part of the housing 107. The oil supplied to the inside of the rolling bearing 106 accumulates in the sealed space S1, and when the pressure in the sealed space S1 becomes equal to or higher than a predetermined pressure, as shown by the broken line in FIG. Through the discharge port 115 and between the lip portion 131 of the outer seal member 130 and the roll neck 151, it is discharged to the outside of the sealed space S <b> 1.

Japanese Patent No. 3991321 (see FIG. 4)

In the sealing device 100, since the lip 131 of the outer seal member 130 is in line contact with the outer peripheral surface of the roll neck 151, the sealing performance is low. Therefore, it is conceivable to improve the sealing performance by bringing the lip 131 of the outer seal member 130 into surface contact with the outer peripheral surface of the roll neck 151. However, in this case, the oil in the sealed space S1 is not easily discharged to the outside of the outer seal member 130. .
This invention is made | formed in view of such a problem, and it aims at providing the sealing member which can improve the discharge performance of a lubricant while improving sealing performance.

  The seal member of the present invention seals the annular space between the housing and the rotating shaft, suppresses foreign matter from entering the housing, and prevents the lubricant supplied into the housing from entering the housing. A seal member for discharging out of the housing, having a seal main body fitted in a concave groove formed in the inner peripheral surface of the housing, and a contact surface in surface contact with the outer peripheral surface of the rotary shaft; A seal lip portion extending radially inward from the seal main body, and the contact surface of the seal lip portion is provided with a lubricant in the housing at an inner periphery of the seal main body at a top portion in use. An inner peripheral discharge groove is formed for discharging to the outside of the housing through the side, and the seal body is configured to remove the lubricant in the housing at a portion which becomes a top portion in use. Characterized in that through the outer peripheral side with an outer circumferential side discharge passage for discharging into the housing outside.

  According to the present invention, since the seal lip portion has a contact surface that comes into surface contact with the outer peripheral surface of the rotary shaft, the sealing performance can be improved as compared with a conventional seal member that makes line contact with the outer peripheral surface of the rotary shaft. Also, the lubricant in the housing is discharged from the inner and outer peripheral sides of the seal body to the outside of the housing by the inner peripheral discharge groove formed on the contact surface of the seal lip and the outer peripheral discharge passage of the seal body. Therefore, the lubricant discharging performance can be improved. In addition, since the inner peripheral discharge groove and the outer peripheral discharge path are arranged at the top where foreign substances outside the housing are unlikely to accumulate when the seal member is used, the sealing performance of the seal member is not impaired.

The outer peripheral discharge path includes at least a first outer discharge groove formed on an outer side surface of the seal body, a second outer discharge groove formed on the outer periphery of the seal body, and the seal body. It is preferable that it is comprised by the 3rd outer peripheral side discharge groove formed in the side surface of the inner side.
In this case, the lubricant in the housing is supplied with the third outer peripheral discharge groove formed on the inner side surface of the seal body, the second outer peripheral discharge groove formed on the outer peripheral surface of the seal body, and the outer side of the seal body. The first outer peripheral side discharge grooves formed on the side surfaces of the first outer peripheral side can be discharged in this order and discharged out of the housing.

It is preferable that a plurality of the first to third outer peripheral discharge grooves are formed.
In this case, the lubricant in the housing can be discharged out of the housing through the plurality of first to third outer peripheral discharge grooves, so that the lubricant discharge performance can be further improved.

The outer peripheral discharge path includes at least a first outer discharge groove formed on an outer side surface of the seal body, a second outer discharge groove formed on the outer periphery of the seal body, and the seal body. And a through hole that communicates the second outer peripheral side discharge groove and the inner peripheral side discharge groove.
In this case, the lubricant in the housing is discharged from the inner peripheral discharge groove, the through hole, the second outer peripheral discharge groove formed on the outer peripheral surface of the seal body, and the first outer periphery formed on the outer side surface of the seal body. It can be discharged out of the housing through the side discharge grooves.

It is preferable that a plurality of the first and second outer peripheral discharge grooves are formed, and the same number of the through holes as the first and second outer discharge grooves are formed.
In this case, the lubricant in the housing can be discharged out of the housing from the plurality of through holes through the plurality of first and second outer peripheral discharge grooves, so that the lubricant discharge performance can be further improved. it can.

It is preferable that an annular lubrication groove is formed on the contact surface of the seal lip portion so as to communicate with the inner circumferential discharge groove and guide and store the lubricant from the inner circumferential discharge groove.
In this case, since the contact surface of the seal lip portion is lubricated by the lubricant stored in the lubrication groove, the progress of wear can be suppressed.

It is preferable that the seal member further includes an auxiliary lip portion that protrudes radially inward from the seal body on the outer side of the seal lip portion and contacts the outer peripheral surface of the rotating shaft.
In this case, since the auxiliary lip portion can suppress foreign matters outside the housing from reaching the seal lip portion, the sealing performance of the seal member can be further enhanced.

  According to the sealing member of the present invention, it is possible to improve the discharge performance of the lubricant while improving the sealing performance.

It is sectional drawing which shows the use condition of the sealing device provided with the sealing member which concerns on 1st Embodiment of this invention. It is a principal part expanded sectional view which shows a sealing member. It is a side view which shows the inner surface of a seal body, and the top part of a seal lip part. It is a side view which shows the top part of the outer surface of a seal body. It is a side view which shows the inner surface of the seal main body of the sealing member which concerns on 2nd Embodiment of this invention, and the top part of a seal lip | rip part. It is a side view which shows the top part of the outer surface of the seal body of FIG. It is a principal part expanded sectional view which shows the sealing member which concerns on 3rd Embodiment of this invention. FIG. 8 is a side sectional view of FIG. 7. It is sectional drawing which shows the conventional sealing device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[First Embodiment]
<Overall configuration>
FIG. 1 is a cross-sectional view showing a usage state of a sealing device including a sealing member according to a first embodiment of the present invention.
In this embodiment, the case where the sealing device C is applied to the bearing device D that rotatably supports the segment roll 5 of the continuous casting machine is shown.

  Each segment roll 5 has a roll body 55 that comes into contact with a steel piece continuously discharged from the mold, and a reduced diameter portion 50 that is provided on both sides of the roll body 55 and has a smaller diameter than the roll body 55. ing. The reduced diameter portion 50 is inserted into a cylindrical housing 7 disposed so that the center line thereof is oriented in the horizontal direction, and is supported by the housing 7 via a rolling bearing 6 so as to be rotatable. Each segment roll 5 is cooled by jetting cooling water.

The rolling bearing 6 is, for example, a cylindrical roller bearing with a centering ring, and includes an outer ring 60, a plurality of cylindrical rollers 61, a centering ring 62, and an inner ring 65. An oil supply hole 70 for supplying oil (lubricant) to the inside of the rolling bearing 6 is provided in the lower portion of the housing 7.
An annular groove 67 that communicates with the oil supply hole 70 is formed on the outer peripheral surface of the aligning ring 62, and the aligning ring 62 and the outer ring 60 are supplied from the annular groove 67 to the inside of the rolling bearing 6. A hole 68 is provided. In an operating state of the continuous casting machine, oil is continuously supplied into the rolling bearing 6 from the oil supply hole 70 together with the pressurized air. In FIG. 1, broken lines indicate an oil supply path and a discharge path.

On both sides in the axial direction of the rolling bearing 6, the first and second sealing devices are used for the purpose of retaining oil inside the housing 7 and preventing foreign matter (including cooling water; hereinafter the same) from entering the housing 7. 1 and 4 are provided. The first sealing device 1 is disposed on the roll neck 51 side of the reduced diameter portion 50, and the second sealing device 4 is disposed on the roll end 52 side. The first and second sealing devices 1 and 4 constitute a sealing device C according to this embodiment.
The first and second sealing devices 1 and 4 isolate the annular space between the reduced diameter portion 50 of the segment roll 5 and the housing 7 from the external space S2 as a sealed space S1. The oil supplied to the inside of the rolling bearing 6 is stored in the sealed space S1.

In the first sealing device 1, a seal 10 made of an elastic material such as synthetic rubber is bonded to a core metal 12 having an L-shaped cross section. The seal 10 includes first and second lip portions 13 and 14 that are in contact with the outer peripheral surface of the roll neck 51.
The first lip 13 functions to prevent leakage of oil to the outside and to stay in the sealed space S1. The second lip portion 14 is in contact with the outer peripheral surface of the roll neck 51 on the side farther from the sealed space S1 than the first lip portion 13, and functions to prevent foreign matter from entering the sealed space S1.

  An oil outlet 15 is formed in the seal 10 and the cored bar 12. A plurality of the discharge ports 15 are arranged so as to be adjacent to each other at a predetermined interval in the circumferential direction. Each discharge port 15 passes through the core 12 along the axial direction to reach the vicinity of the side surface 11 on the sealed space S1 side of the seal 10, and the seal 10 between the recess 15 a and the side surface 11 of the seal 10. It is comprised with the cut | interruption 15b provided in the thin part. When the pressure of the oil is applied from the side surface 11 of the seal 10 to a predetermined pressure or more, the cut 15b is opened against the elastic force of the elastic material, and the oil is discharged from the discharge port 15 to the outside.

The second sealing device 4 has substantially the same configuration as the first sealing device 1, and a seal 41 made of an elastic material such as synthetic rubber is bonded to a core bar 45 having an L-shaped cross section. The seal 41 includes first and second lip portions 43 and 44 that are in contact with the outer peripheral surface of the roll end 52.
The first lip portion 43 functions to prevent leakage of oil to the outside and to keep the oil in the sealed space S1. The second lip portion 44 extends to the outer space S2 side (the outer space S2 side axially outward of the segment roll 5) from the first lip portion 43 and contacts the outer peripheral surface of the roll end 52.

  An annular concave groove 72 is formed on the inner peripheral surface of the side wall 71 of the housing 7 on the roll body 55 side. In order to prevent foreign matter in the outer space S2 (outside the housing 7) from entering the housing 7 and to discharge the oil supplied to the inside of the rolling bearing 6 to the outside of the housing 7, A seal member 2 is provided. The seal member 2 constitutes a sealing device C according to this embodiment together with the first and second sealing devices 1 and 4.

<Seal member>
FIG. 2 is an enlarged cross-sectional view of a main part showing the seal member 2.
The seal member 2 is made of an elastic material such as synthetic rubber, and includes a seal body 21 fitted in the concave groove 72 of the housing 7, a seal lip portion 22 and an auxiliary lip portion 23 that extend radially inward from the seal body 21, and It has. The seal body 21 is sandwiched and fixed between a side surface 72a on the outer side (roll body side 55) B and a side surface 72c on the inner side (sealed space S1 side) A of the concave groove 72.

The seal body 21 has an outer surface 21 a that contacts the side surface 72 a on the outer side B of the groove 72, an outer peripheral surface 21 b that contacts the inner surface 72 b of the groove 72, and a side surface 72 c on the inner side A of the groove 72. And an inner surface 21c that abuts.
The outer peripheral surface 21b of the seal body 21 is formed along the axial direction, and the entire axial length is in contact with the inner peripheral surface 72b. Further, the outer surface 21 a of the seal body 21 is formed in a planar shape along the radial direction, and the entire length in the radial direction is in contact with the side surface 72 a of the concave groove 72.

The inner side surface 21c of the seal body 21 has an annular projecting portion 21d that projects toward the inner side A on the radially outer side. The projecting portion 21 d is formed in a triangular shape in cross section, and the tip portion thereof is in contact with the side surface 72 c of the concave groove 72.
Thus, since the inner side surface 21c of the seal body 21 is in contact with the side surface 72c of the concave groove 72 only, the contact area with the side surface 72c is small. For this reason, when the seal member 2 is assembled to the housing 7, the seal body 21 can be easily fitted in the concave groove 72.

  The seal lip portion 22 has a contact surface 22 a that comes into surface contact with the outer peripheral surface of the roll neck 51 in order to prevent foreign matter on the outer side B from entering the inner side A. A plurality (two in this case) of annular lubrication grooves 22b are formed in the contact surface 22a at predetermined intervals in the axial direction. As a result, the oil discharged from the first sealing device 1 is guided and stored in the lubricating grooves 22b from the inner peripheral discharge grooves 22c (described later).

  The auxiliary lip portion 23 extends radially inward and outward B from the inner periphery of the seal body 21 on the outer side of the seal lip portion 22 and is in contact with the outer peripheral surface of the roll neck 51. Thereby, the auxiliary lip portion 23 functions to prevent foreign matter on the outer side B from reaching the seal lip portion 22. Further, the auxiliary lip 23 is elastically deformed radially outward and toward the outer side B when oil pressure is applied from the inner side A to a predetermined pressure or more. Accordingly, the auxiliary lip portion 23 also has a function of discharging the oil on the inner side A to the outside of the housing 7.

<Inner circumference discharge groove>
FIG. 3 is a side view showing the inner side surface 21 c of the seal body 21 and the top of the seal lip portion 22.
2 and 3, the contact surface 22 a of the seal lip portion 22 has an inner side A for discharging the oil on the inner side A to the outer side B through the inner peripheral side of the seal body 21 at the top portion in use. A circumferential discharge groove 22c and a thin film lip 22d are formed.

  The inner peripheral side discharge groove 22c is formed on the side surface on the inner side A of the seal lip portion 22 and extends in the axial direction from the opening toward the outer side B. Further, the inner circumferential discharge groove 22c is formed symmetrically in the circumferential direction across the center line K of the seal member 2 that passes through the position that becomes the apex when the seal member 2 is used.

  The inner circumferential discharge groove 22c communicates with the lubrication groove 22b. As shown in FIG. 3, both side surfaces 22c1 in the circumferential direction of the inner circumferential discharge groove 22c are convex curved surfaces so that the circumferential groove width gradually increases from the radially outer end toward the radially inner end in a side view. It is formed in a shape.

  In FIG. 2, the thin film lip 22 d is formed on the side surface on the outer side B of the seal lip portion 22, and the inner peripheral end thereof is in contact with the outer peripheral surface of the roll neck 51. The film thickness of the thin film lip 22d is set to about 0.2 mm. The thin film lip 22d is elastically deformed to the outer side B by the pressure of the oil that has entered the inner circumferential discharge groove 22c. As a result, the oil on the inner side A passes through the inner peripheral discharge groove 22c, the thin film lip 22d and the auxiliary lip 23 and is discharged to the outer side B as indicated by a broken line arrow I in FIG.

<Outer peripheral discharge path>
The seal body 21 is provided with an outer peripheral side discharge passage 24 for the purpose of discharging the oil on the inner side A to the outer side B through the outer peripheral side of the seal body 21 at the portion that becomes the top during use.
The outer peripheral side discharge path 24 of the present embodiment has first to third outer peripheral side discharge grooves 24a to 24c formed on the both side surfaces 21a and 21c and the outer peripheral surface 21b of the seal body 21 at the top portion when used. It is comprised by. The first to third outer peripheral discharge grooves 24a to 24c are formed symmetrically in the circumferential direction with the center line K interposed therebetween (see also FIGS. 3 and 4).

FIG. 4 is a side view showing the top of the outer side surface 21 a of the seal body 21. As shown in FIGS. 2 and 4, the first outer peripheral discharge groove 24 a is formed over the entire length in the radial direction of the outer surface 21 a of the seal body 21.
The second outer peripheral discharge groove 24 b is formed at the top of the first outer peripheral discharge groove 24 a in a side view, and is formed over the entire axial length of the outer peripheral surface 21 b of the seal body 21. The groove width of the second outer peripheral discharge groove 24b is set to the same dimension as the groove width of the first outer discharge groove 24a.

As shown in FIGS. 2 and 3, the third outer peripheral discharge groove 24 c is formed directly below the second outer peripheral discharge groove 24 b in a side view, and in the protruding portion 21 d of the inner side surface 21 c of the seal body 21, It is formed over the entire length in the radial direction. The groove width of the third outer peripheral discharge groove 24c is set to the same dimension as the groove widths of the first and second outer discharge grooves 24a and 24b.
As a result, the oil on the inner side A passes through the third outer peripheral discharge groove 24c, the second outer peripheral discharge groove 24b, and the first outer peripheral discharge groove 24a in this order, as indicated by the broken arrow II in FIG. Discharged to side B.

  As described above, according to the seal member 2 of the present embodiment, the seal lip portion 22 has the contact surface 22a that comes into surface contact with the outer peripheral surface of the segment roll 5, so that the conventional seal member that makes line contact with the outer peripheral surface of the rotating shaft Compared with the sealing performance can be improved. Further, the inner peripheral side discharge groove 22 c formed on the contact surface 22 a of the seal lip portion 22 and the outer peripheral side discharge path 24 of the seal main body 21 allow the oil in the housing 7 to be transferred to the inner peripheral side and outer peripheral side of the seal main body 21. The oil can be discharged out of the housing 7 respectively, so that the oil discharging performance can also be improved. Moreover, since the inner peripheral discharge groove 22c and the outer peripheral discharge path 24 are arranged at the top where foreign matter outside the housing 7 is difficult to deposit when the seal member 2 is used, the sealing performance of the seal member 2 is not impaired. Absent.

  Moreover, since the outer peripheral side discharge path 24 of this embodiment is comprised by the 1st-3rd outer peripheral side discharge grooves 24a-24c formed in each of the both-sides surface 21a, 21c of the seal main body 21, and the outer peripheral surface 21b. The oil in the housing 7 can be discharged out of the housing 7 through the third outer peripheral side discharge groove 24c, the second outer peripheral side discharge groove 24b, and the first outer peripheral side discharge groove 24a in this order.

Further, since the contact surface 22a of the seal lip portion 22 is lubricated by the oil stored in the lubrication groove 22b formed in the contact surface 22a, the progress of wear can be suppressed.
In addition, since the auxiliary lip portion 23 can suppress foreign matters outside the housing 7 from reaching the seal lip portion 22, the sealing performance of the seal member 2 can be further enhanced.

[Second Embodiment]
FIG. 5 is a side view showing the inner surface 21 of the seal body 21 and the top of the seal lip portion 22 of the seal member 2 according to the second embodiment of the present invention. FIG. 6 is a side view showing the top of the outer surface 21a of the seal body 21 of the seal member 2 according to the second embodiment.
The seal member 2 of the second embodiment is different from the seal member 2 of the first embodiment in that a plurality of first to third outer peripheral side discharge grooves 24a to 24c are formed.

  As shown in FIG. 6, the first outer peripheral side discharge groove 24 a of the present embodiment is formed in the outer surface 21 a of the seal body 21 at three locations at equal intervals in the circumferential direction in the portion that becomes the top portion when used. Of these three locations, the first outer discharge groove 24a located at the center in the circumferential direction is formed symmetrically with respect to the circumferential direction with the center line K in between. Each first outer peripheral discharge groove 24a is set to have the same groove width.

  The second outer peripheral side discharge groove 24b of the present embodiment is formed in the outer peripheral surface 21b of the seal body 21 at three locations at equal intervals in the circumferential direction in the portion that becomes the top portion in use. Of these three locations, the second outer peripheral discharge groove 24b located at the center in the circumferential direction is formed symmetrically with respect to the circumferential direction with the center line K interposed therebetween. Each of the second outer peripheral discharge grooves 24b is set to have the same width as that of the first outer peripheral discharge groove 24a.

As shown in FIG. 5, the third outer peripheral side discharge groove 24 c of the present embodiment is formed in the protruding portion 21 d of the inner side surface 21 c of the seal main body 21 at three locations at equal intervals in the circumferential direction in the portion that becomes the top portion in use. Yes. Of these three locations, the third outer discharge groove 24c located at the center in the circumferential direction is formed symmetrically with respect to the circumferential direction with the center line K in between. Each of the third outer peripheral discharge grooves 24c is formed to have the same groove width, and is set to have the same size as the groove widths of the first and second outer peripheral discharge grooves 24a and 24b.
In addition, the point which abbreviate | omitted description in 2nd Embodiment is the same as that of 1st Embodiment.

  As described above, according to the seal member 2 of the present embodiment, the first to third outer peripheral side discharge grooves 24a to 24c are provided in plural (three pieces) on each of the both side surfaces 21a and 21c and the outer peripheral surface 21b of the seal body 21. ), The oil in the housing 7 can be discharged out of the housing 7 through the plurality of first to third outer peripheral discharge grooves 24a to 24c. Thereby, the oil discharge performance can be further improved.

[Third Embodiment]
FIG. 7 is an enlarged cross-sectional view of a main part showing a seal member 2 according to the third embodiment of the present invention. 8 is a side sectional view of FIG.
The seal member 2 of the third embodiment is a modification of the second embodiment, and the seal member of the second embodiment is different in that the shape of the inner side surface 21c of the seal body 21 and the configuration of the outer peripheral discharge path 24 are different. 2 and different.

  7 and 8, the inner surface 21c of the seal main body 21 of the present embodiment is not formed with the protruding portion 21d and the third outer peripheral discharge groove 24c (see FIG. 2). For this reason, the inner side surface 21 c of the seal body 21 of the present embodiment is formed in a planar shape along the radial direction, and the entire length in the radial direction is in contact with the side surface 72 c of the concave groove 72.

The outer peripheral discharge path 24 of the present embodiment includes a plurality of first and second outer peripheral discharge grooves 24a and 24b formed on the outer surface 21a and the outer peripheral surface 21b of the seal body 21, respectively, and a second outer peripheral discharge. A plurality of through holes 24d communicating the groove 24b and the inner circumferential discharge groove 22c are formed.
As shown in FIG. 8, three through holes 24d are formed at equal intervals in the circumferential direction at the top portion of the seal body 21 when used. The through hole 24d located at the center in the circumferential direction among these three portions is formed symmetrically with respect to the circumferential direction with the center line K interposed therebetween.

Each through-hole 24d is set to have the same diameter and the same size as the groove widths of the first and second outer peripheral discharge grooves 24a and 24b.
As a result, the oil on the inner side A passes through the inner peripheral discharge groove 22c, the through hole 24d, the second outer peripheral discharge groove 24b, and the first outer peripheral discharge groove 24a in this order, as shown by the broken line arrow II in FIG. And discharged to the external side B.
In addition, the point which abbreviate | omitted description in 3rd Embodiment is the same as that of 1st and 2nd Embodiment.

  As described above, according to the seal member 2 of the present embodiment, the outer peripheral discharge path 24 is configured by the first outer peripheral discharge groove 24a, the second outer peripheral discharge groove 24b, and the through hole 24d of the seal body 21. The oil in the housing 7 can be discharged out of the housing 7 through the inner peripheral discharge groove 22c, the through hole 24d, the second outer peripheral discharge groove 24b, and the first outer peripheral discharge groove 24a in this order.

  Since the same number of through holes 24d as the first and second outer peripheral discharge grooves 24a and 24b are formed, the oil in the housing 7 is supplied from the plurality of through holes 24d to the plurality of first and second holes. It can be discharged out of the housing 7 through the outer peripheral discharge grooves 24a and 24b. Thereby, the oil discharge performance can be further improved.

  Note that the present invention is not limited to the above-described embodiment, and can be implemented with appropriate modifications. For example, the seal member 2 of the above embodiment is applied to a bearing device to which oil is supplied together with pressurized air as a lubricant, but may be applied to a bearing device to which grease is supplied. Further, a plurality of through holes 24d formed in the seal body 21 of the third embodiment are formed, but it is sufficient that at least one through hole is formed.

  Furthermore, the through hole 24d of the third embodiment may be formed in the seal body 21 of the first embodiment. In this case, the seal member 2 has a first discharge path that guides the oil in the housing 7 to the outside of the housing 7 through the third outer peripheral discharge groove 24c, the second outer discharge groove 24b, and the first outer discharge groove 24a. And a second discharge path that leads to the outside of the housing 7 through the inner peripheral discharge groove 22c, the through hole 24d, the second outer peripheral discharge groove 24b, and the first outer peripheral discharge groove 24a. The discharge performance can be further improved.

  2: seal member, 5: segment roll (rotating shaft), 7: housing, 21: seal body, 21a: outer surface, 21b: outer peripheral surface, 21c: inner surface, 22: seal lip, 22a: contact surface, 22b : Lubrication groove, 22c: inner peripheral discharge groove, 23: auxiliary lip portion, 24: outer peripheral discharge path, 24a: first outer peripheral discharge groove, 24b: second outer peripheral discharge groove, 24c: third outer peripheral discharge Groove, 24d: through hole, 72: concave groove

Claims (7)

An annular space between the housing and the rotating shaft is sealed, foreign matter outside the housing is prevented from entering the housing, and lubricant supplied into the housing is discharged outside the housing. A sealing member,
A seal main body fitted in a concave groove formed on the inner peripheral surface of the housing;
A seal lip portion having a contact surface in surface contact with the outer peripheral surface of the rotating shaft and extending radially inward from the seal body;
The contact surface of the seal lip portion is formed with an inner peripheral discharge groove for discharging the lubricant in the housing through the inner peripheral side of the seal body to the outside of the housing at a portion that becomes a top portion in use. ,
The seal body has an outer peripheral side discharge passage for discharging the lubricant in the housing to the outside of the housing through the outer peripheral side of the seal body at a portion that becomes a top portion in use. The outer peripheral discharge path is at least
A first outer discharge groove formed on the outer side surface of the seal body;
A second outer peripheral discharge groove formed on the outer peripheral surface of the seal body;
The seal member according to claim 1, comprising a third outer peripheral discharge groove formed on a side surface on the inner side of the seal body.   The sealing member according to claim 2, wherein a plurality of the first to third outer peripheral side discharge grooves are formed. The outer peripheral discharge path is at least
A first outer discharge groove formed on the outer side surface of the seal body;
A second outer peripheral discharge groove formed on the outer peripheral surface of the seal body;
2. The seal member according to claim 1, wherein the seal member includes a through hole formed in the seal body and communicating the second outer peripheral discharge groove and the inner peripheral discharge groove. A plurality of the first and second outer peripheral discharge grooves are formed,
The sealing member according to claim 4, wherein the same number of the through holes as the first and second outer peripheral discharge grooves are formed.   6. An annular lubricating groove is formed on the contact surface of the seal lip portion so as to communicate with the inner peripheral discharge groove and guide and store the lubricant from the inner peripheral discharge groove. The sealing member according to claim 1.   7. The auxiliary lip portion that protrudes radially inward from the seal body on the outer side of the seal lip portion and further contacts the outer peripheral surface of the rotating shaft. 8. Seal member.

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