JP2010216635A - Sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure appropriate permeability between the opposed ends of annular members 21, 22 and improve the working efficiency of installation of a sealing device into an installation groove 23 in a sealing device 10 which is disposed in the installation groove 23 formed in the inner periphery of a plurality of axially arranged annular members 21, 22 between the opposed ends thereof. <P>SOLUTION: An elastic ring 1 made of a rubber-like elastic material which is disposed so as to close the gap between the opposed ends is installed in the installation groove 23 which is formed in the inner periphery of the plurality of axially arranged annular members 21, 22 at the opposed ends. Projections 12 which hold the elastic ring 1 in the installation groove 23 when pressed against the inner surface of the installation groove 23 are formed on at least one of the axial both end faces of the elastic ring 1 intermittently in the circumferential direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sealing device that is suitably used for sealing, for example, a roll neck bearing of a rolling mill.

  Since a rolling mill requires a large amount of rolling water for cooling, the roll neck bearing is provided with a sealing device so that rolling water or the like does not enter inside.

  FIG. 6 shows a roll neck bearing of a rolling mill equipped with a conventional sealing device. This bearing is arranged on a pair of inner rings 101 arranged in the axial direction and on the outer peripheral side thereof via a spacer 103. Three outer rings 102 arranged in the axial direction, tapered rollers 104 arranged between the inner ring 101 and the outer ring 102 in four rows in the circumferential direction so as to be able to roll, and the tapered rollers 104 in each row are circumferentially arranged. A pair of oil seals 106 which are attached to the outer end of the outer ring 102 and are slidably in contact with the outer peripheral surface of the inner ring 101, and the inner rings 101, 101. And a sealing device 110 interposed between the opposing ends.

  The sealing device 110 is an object of the present invention. Specifically, as shown in FIG. 7, an annular mounting groove formed across the inner peripheral surfaces of the opposite ends of the inner rings 101, 101. 107, an elastic ring 111 made of a rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity), and a groove formed on the inner peripheral surface of the elastic ring 111 and continuing in the circumferential direction An annular reinforcing spring 112 fitted into the inner ring 101, 101 from the inner periphery of the inner ring 101, 101 between the opposing ends of the inner ring 101, 101 (mounting groove 107), rolling water or the like is the internal space of the bearing Intrusion into 108 is prevented.

  As a typical prior art of this type of sealing device, those described in the following prior art documents are known.

Japanese Patent Laid-Open No. 9-329243

  However, in the conventional sealing device 110, the elastic ring 111 is slidably brought into close contact with the inner surface of the mounting groove 107 by the rigidity of the reinforcing spring 112 and seals between the inner rings 101, 101. May become negative pressure due to temperature difference during operation. When such negative pressure is generated, the amount of rolling water entering the internal space 108 from the oil seals 106 on both axial sides increases. There is a risk that. Specifically, when the temperature of the bearing rises, the air existing in the bearing internal space 108 expands, and a part of the air pushes open the elastic ring 111 and the oil seals 106 and 106 and flows out to the outside. When the temperature of the bearing decreases, the air in the bearing internal space 108 contracts and becomes lower than the external atmospheric pressure.

  Therefore, conventionally, the surface pressure of the elastic ring 111 with respect to the inner surface of the mounting groove 107 is adjusted by the reinforcing spring 112 to prevent generation of negative pressure in the internal space 108 by ensuring appropriate air permeability. If the rigidity of the reinforcing spring 112 is reduced for that purpose, for example, when the shaft center of the rolling roll (bearing shaft center) extends substantially horizontally, the sealing device 110 is mounted in the mounting groove 107. In addition, as shown in FIG. 8, the upper portion 110 a of the sealing device 110 may hang down from the mounting groove 107 due to its own weight. For this reason, when the roll neck is inserted in the inner circumference of the inner rings 101, 101 in such a hanging state, the sealing device 110 is damaged by interference with the roll neck, and the required sealing performance is obtained. There was a problem that could not be obtained.

  The present invention has been made in view of the above points, and the technical problem thereof is a mounting groove formed across the inner circumference between opposed end portions of a plurality of annular members arranged in the axial direction. In the sealing device arranged inside, it is to ensure a proper air permeability between the opposed end portions of the annular member and to improve the mounting workability in the mounting groove.

  As means for effectively solving the technical problem described above, a sealing device according to the present invention is provided in a mounting groove formed across the inner circumferences of mutually facing end portions of a plurality of annular members arranged in the axial direction. And an elastic ring made of a rubber-like elastic material disposed so as to close the gap between the opposing ends, and at least one of both axial end surfaces of the elastic ring is pressed against the inner surface of the mounting groove. Thus, protrusions for holding the elastic ring in the mounting groove are formed intermittently in the circumferential direction.

  According to the sealing device of the present invention, since the elastic ring is held between the inner side surfaces of the mounting groove by the protrusions formed intermittently on the elastic ring in the circumferential direction, the mounting workability is improved and the mounting is improved. A gap through which gas can pass is secured between the groove and the inner surface of the groove, thereby preventing a pressure change in the inner space of the sealing device.

It is sectional drawing which cut | disconnects and shows the roll neck bearing of the rolling mill equipped with the sealing device which concerns on the 1st form of this invention by the plane which passes along the axial center. It is sectional drawing which expands and shows the principal part of FIG. It is a section perspective view showing a part of sealing device concerning the 1st form of the present invention. It is sectional drawing which cut | disconnects and shows the sealing device which concerns on the 2nd form of this invention by the plane which passes along the axial center. It is sectional drawing which cut | disconnects and shows the sealing device which concerns on the 3rd form of this invention by the plane which passes along the axial center. It is sectional drawing which cuts and shows the roll neck bearing of the rolling mill equipped with the conventional sealing device by the plane which passes along the axial center. It is sectional drawing which expands and shows a part of FIG. It is explanatory drawing which shows the state which drooped in the installation process of the sealing device.

  Hereinafter, preferred embodiments of a sealing device according to the present invention will be described with reference to the drawings. First, FIG. 1, FIG. 2 and FIG. 3 show a first embodiment of the present invention.

  The roll neck bearing of the rolling mill shown in FIG. 1 has a pair of inner races 21 and 22 each having two raceways on the outer circumferential surface and arranged in the axial direction, and one raceway 21a in one inner race 21 and An outer ring 31 having two rows of raceway surfaces 31 a and 31 b located on the outer circumference side of the other raceway surface 22 b in the other inner ring 22 and a raceway surface 32 a located on the outer circumference side of the other raceway surface 21 b in one inner ring 21. The outer ring 32 having the outer ring 32, the outer ring 33 having the raceway surface 33 a located on the outer peripheral side of the one raceway surface 22 a of the other inner ring 22, and the outer rings 31 to 33 aligned in the axial direction are interposed between the mutually facing ends. Are arranged in four rows in the circumferential direction so that they can roll between the spacers 34 and 35, between the raceway surfaces 21a and 31a, between the raceway surfaces 22b and 31b, between the raceway surfaces 21b and 32a, and between the raceway surfaces 22a and 33a. Cone Between the rollers 41 to 44, the retainers 51 to 54 that hold the tapered rollers 41 to 44 in each row at predetermined intervals in the circumferential direction, and the end member 36 having an outer diameter portion fixed to the outer ring 32 and the outside thereof. Between the outer ring 33 and the end member 37 fixed to the outside thereof. The oil seal 61 is attached to the outer ring 33 so that the inner diameter seal lip is slidably in contact with the outer peripheral surface of the outer ring. An oil seal 62 that is attached and has a seal lip with an inner diameter slidably in contact with an outer peripheral surface of the outer end of the inner ring 22, and a sealing device 10 that is disposed on the inner periphery of the opposite ends of the inner rings 21 and 22; Is provided.

  The inner rings 21 and 22 correspond to the annular member described in claim 1, and the outer peripheral surface of the roll neck of the shaft portion of the rolling roll (not shown) whose inner diameter is abutted against each other in the axial direction. The outer rings 31 to 33 are attached to an inner peripheral surface of a housing (not shown) in a state of being in contact with each other via spacers 34 and 35.

  An annular mounting groove 23 is formed across the inner rings 21 and 22 on the inner peripheral surfaces of the opposing ends of the inner rings 21 and 22, and the sealing device 10 of the present invention is shown in FIG. As described above, the elastic ring 1 is disposed in the mounting groove 23 so as to close the gap between the opposing ends, and is fitted into the groove 11 formed on the inner peripheral surface of the elastic ring 1 and continuous in the circumferential direction. It consists of an annular reinforcing spring 2.

  Specifically, as shown in FIG. 2, the elastic ring 1 is formed of a rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity), and the outer peripheral surface 1 a has the mounting groove 23. The inner ring 21 side bottom surface 23a and the inner ring 22 side bottom surface 23b are in close contact with each other through a minute gap in a partial contact state, and the inner peripheral surface 1b is slightly smaller than the inner diameters of the inner rings 21,22. Large diameter. Since the inner rings 21 and 22 have a slight rotational difference during operation, the outer peripheral surface 1 a of the elastic ring 1 slides with either the bottom surface 23 a or 23 b of the mounting groove 23.

  Further, protrusions that are brought into pressure contact with the inner side surface 23c of the mounting groove 23 on the one inner ring 21 side and the inner side surface 23d of the mounting groove 23 on the other inner ring 22 side are attached to both end surfaces in the axial direction of the elastic ring 1 with appropriate surface pressure. 12 and 12 are formed. As shown in FIG. 3, the protrusions 12 and 12 are intermittent in the circumferential direction. In other words, a plurality of protrusions 12 are formed at predetermined intervals in the circumferential direction.

  The reinforcing spring 2 is formed by connecting elongated coil springs in an annular shape, has an appropriate spring property for pressing the elastic ring 1 in the outer diameter direction, and tries to restore a circular shape when deformed into a non-circular shape. By the restoring force to be performed, the effect of supplementing the rigidity of the elastic ring 1 is exhibited.

  According to the sealing device 10 of the present invention having the above-described configuration, the elastic ring 1 is inserted into the mounting groove 23 on the inner periphery of the opposite end of the inner rings 21 and 22 in a state where the reinforcing spring 2 is fitted in advance. Installed. At the time of mounting, the apparent outer diameter is set to the inner ring 21 by bending a part of the sealing device 10 in the circumferential direction to the inner diameter side in the same manner as the deformed state of the sealing device 110 shown in FIG. When the force that has bent the sealing device 10 is removed after being inserted into the inner circumferential side of the mounting groove 23 while being smaller than the inner diameter of 22, the restoring force of the elastic ring 1 supplemented by the spring property of the reinforcing spring 2 Thus, the sealing device 10 is inserted into the mounting groove 23 from the inner peripheral side while being restored to the original circular shape.

  At this time, if the elastic ring 1 is lightly pushed into the mounting groove 23 from the inner peripheral side, the protrusions 12 and 12 formed on both end surfaces in the axial direction are suitable for the inner side surfaces 23c and 23d of the mounting groove 23. By contact with the surface pressure, the elastic ring 1 is held between the inner side surfaces 23c and 23d in a state of being separated from the inner side surfaces 23c and 23d of the mounting groove 23. When the shaft center) extends substantially horizontally, the upper portion of the sealing device 10 does not hang down as shown in FIG. For this reason, mounting workability | operativity improves and the damage to the sealing device 10 by a roll neck being inserted in the inner periphery of the inner rings 21 and 22 in the state which the sealing device 10 hung down can be prevented.

  And since the protrusions 12 and 12 formed in the elastic ring 1 are intermittent in the circumferential direction, as shown in FIG. 2 by the relative recess 12a between the protrusions 12 and 12 shown in FIG. A plurality of ventilation paths A are formed at predetermined intervals in the circumferential direction between the inner surfaces 23c and 23d of the mounting groove 23. Further, the elastic ring 1 is held between the inner side surfaces 23c and 23d of the mounting groove 23 by the frictional force of the protrusions 12 and 12, and the holding force to the mounting groove 23 is applied to the spring 2 for reinforcing the outer diameter side. Since it does not depend on the pressing force, the outer peripheral surface 1a of the elastic ring 1 is not completely in close contact with the bottom surfaces 23a and 23b of the mounting groove 23, and is closely opposed to each other through a minute gap in a partial contact state. . For this reason, gas (for example, air) can pass between the outer peripheral surface 1a of the elastic ring 1 and the bottom surfaces 23a and 23b of the mounting groove 23, but liquid (for example, rolling water and oils and fats) cannot pass easily. A minute gap is secured.

  Here, when the temperature of the bearing rises, the air present in the bearing internal space (the space in which the tapered rollers 41 to 44 and the cages 51 to 54 are disposed) S expands. As a result, when the pressure in the bearing inner space S becomes higher than the external atmospheric pressure, a part of the air in the bearing inner space S is caused by the bottom surfaces 23 a and 23 b of the mounting grooves 23 in the inner rings 21 and 22 and the outer periphery of the elastic ring 1. It is discharged to the outside through a minute gap between the surface 1a and the air passage A.

  Further, when the temperature of the bearing decreases from this state, the air present in the bearing internal space S contracts. Therefore, when the pressure in the bearing internal space S becomes lower than the external atmospheric pressure (when it becomes negative pressure), Air outside the bearing flows from the air passage A into the bearing internal space S through a minute gap between the bottom surfaces 23 a and 23 b of the mounting grooves 23 in the inner rings 21 and 22 and the outer peripheral surface 1 a of the elastic ring 1. Moreover, since the air can pass through the minute gap but the liquid cannot easily pass through, the intrusion of external rolling water or the like is effectively blocked.

  Then, the air outside the bearing flows in along with the contraction of the air in the bearing internal space S, so that the negative pressure is eliminated. Therefore, the external rolling water or the like causes the oil seals 61 and 62 on both sides in the axial direction by the negative pressure. It does not pass through and flows into the bearing internal space S, and the frictional load of the oil seals 61 and 62 on the outer peripheral surfaces of the inner rings 21 and 22 does not increase due to the pressure difference from the external atmospheric pressure.

  Next, FIG. 4 is a cross-sectional view of an essential part showing the sealing device according to the second embodiment of the present invention by cutting along a plane passing through its axis.

  The second embodiment of the sealing device 10 is different from the first embodiment described above in that the protrusion 12 is formed only on one end surface in the axial direction of the elastic ring 1. In the illustrated example, the protrusion 12 is brought into pressure contact with an inner surface 23 d of the mounting groove 23 on the inner ring 22 side with an appropriate surface pressure, and the end surface 1 c opposite to the protrusion 12 in the elastic ring 1 is all caused by the compression reaction force of the protrusion 12. The circumference is lightly in close contact with the inner side surface 23c of the mounting groove 23 on the inner ring 21 side. For this reason, a plurality of air passages A are formed on one side of the elastic ring 1 at predetermined intervals in the circumferential direction by the projections 12 interrupted in the circumferential direction, and the other portions are the same as in the first embodiment.

  Therefore, the second embodiment can realize the same effect as the first embodiment.

  Next, FIG. 5 is a sectional view of an essential part showing a sealing device according to a third embodiment of the present invention by cutting along a plane passing through its axis.

  The third embodiment of the sealing device 10 is different from the first embodiment described above in that the reinforcing spring 2 is not fitted into the elastic ring 1, that is, the sealing device 10 is composed only of the elastic ring 1. It is in. Other parts are configured in the same manner as in the first embodiment.

  In other words, according to the present invention, the elastic ring 1 is held between the inner side surfaces 23c and 23d of the mounting groove 23 by the frictional force of the protrusions 12 and 12, and therefore is reinforced as in the first or second embodiment. It is also possible to configure as shown in FIG. Therefore, the cost can be reduced by reducing the number of parts and the assembly process.

DESCRIPTION OF SYMBOLS 1 Elastic ring 1a Outer peripheral surface 2 Reinforcing springs 21 and 22 Inner ring (annular member)
23 Mounting groove

Claims (1)

  An elastic ring made of a rubber-like elastic material is disposed in a mounting groove formed across the inner circumferences of the opposed end portions of a plurality of annular members arranged in the axial direction so as to close the space between the opposed end portions. And at least one of both axial end faces of the elastic ring is formed with intermittent protrusions in the circumferential direction that hold the elastic ring in the mounting groove by being pressed against the inner surface of the mounting groove. A sealing device characterized by that.

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