JP4968520B2 - Bearing device - Google Patents

Description

  The present invention relates to a bearing device provided with a lubricating oil supply device that mixes and supplies mist-like lubricating oil and gas, and particularly relates to a bearing device suitable for use in a roll support device of a steel facility.

  In a multi-stage rolling mill in a steel facility, a backup roll is disposed and supported behind the work roll in order to prevent the work roll from being bent during rolling. In particular, when stainless steel or the like is rolled, an intermediate roll is disposed between the work roll and the backup roll so as to cope with a higher rolling load. Here, as the backup roll, there is a structure in which a plurality of rolling bearings (generally, cylindrical roller bearings) are mounted on a single shaft at a predetermined interval. More specifically, a plurality of outer ring rotating double row roller bearings are arranged on a stationary shaft (backup roll shaft) that is stationary, and the outer ring is pressed against the intermediate roll to deform the intermediate roll during rolling. Suppresses the bending of the work roll.

  Bearing devices used in general steel facilities are often used in harsh environments such as high load, high temperature and high humidity, and high dust in continuous operation. Therefore, in addition to sealing performance to prevent water and foreign matter from entering the bearing device, the bearing device has a structure to maintain an oil bath inside and enable operation without lubrication for a long time even if an abnormality occurs in the lubrication device. Is required. In order to meet such demands, so-called oil mist lubrication in which mist-like lubricating oil is supplied together with gas to the roller bearings through the inside of the shaft is sometimes used in the backup roll (see Patent Document 1).

In a general oil mist lubrication device, mist-like lubricating oil generated from a supply source is conveyed by compressed air to a rolling bearing through a pipe. A restrictor is provided in the vicinity of the oil supply port of the rolling bearing. By narrowing the conveying path with this restrictor, the air flow rate is increased, and mist-like lubricating oil is collided with the wall surface inside the rolling bearing to cause oil droplets. Turn into. Such oil droplets can be used to lubricate the rolling bearing. Further, the supplied air and the lubricating oil used for lubrication are discharged to the outside from the oil seal of the rolling bearing. The required supply amount of lubricating oil to the rolling bearing can be generally determined from the bearing size and the number of rows, and the amount of air is determined by the hole shape of the throttle. In the case of a supply system that uses a single supply source and distributes lubricating oil to multiple bearing devices using branched pipes, the total supply amount is usually the sum of each bearing device plus the amount that is considered safe. Set.
Japanese Utility Model Publication No. 52-51944 Japanese Utility Model Publication No. 1-14322

  By the way, in recent years, higher efficiency of the rolling process has been promoted, and the rotation speed of the work roll tends to increase. Along with this, the amount of heat generated from the work roll increases, so that a large amount of rolling oil is sprayed around the backup roll to suppress heat generation. However, since the rolling oil has a lower viscosity than the lubricating oil, if the rolling oil enters the rolling bearing, the lubricity of the rolling bearing is lowered and the life may be shortened. On the other hand, in patent document 2, it arrange | positions a seal | sticker between the outer ring | wheel and inner ring | wheel of a rolling bearing, and it suppresses that rolling oil etc. penetrate | invade into an inside.

  However, it has been found that rolling oil intrusion cannot be completely prevented only by placing a seal between the outer ring and the inner ring of the rolling bearing.

  The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide a bearing device capable of suppressing the entry of foreign matter from the outside and appropriately lubricating the rolling bearing by oil mist lubrication. .

A bearing device according to the present invention is a bearing device used in a roll support device, and includes a rolling bearing provided with an inner ring fitted to a fixed shaft, and mist-like lubricating oil mixed with a gas, and the fixed shaft and A lubricating oil supply device for supplying the rolling bearing into the rolling bearing through the inner ring,
A sealing device for sealing between the fixed shaft and the inner ring ;
A seal device that seals between an inner ring and an outer ring of the rolling bearing;
In order to maintain the pressure in the rolling bearing at a predetermined pressure higher than the atmospheric pressure, the sealing device is configured such that when the pressure in the rolling bearing exceeds the valve opening pressure, the lubricating oil and gas from the rolling bearing A valve body that allows discharge is provided, and the valve body includes a housing provided with a discharge passage for lubricating oil and gas, a valve that can shield the discharge passage, and the valve for the rolling bearing. And a spring urging from the outer side toward the housing .

  As a result of diligent research, the present inventors have found that a gap of about several μm to 100 μm exists between the inner ring of the rolling bearing and the fixed shaft, and the rolling oil enters from the outside through this gap, and further the oil mist It has been found that it penetrates into the rolling bearing through a hole for lubrication. Therefore, even if a sealing device is provided between the outer ring and the inner ring of the rolling bearing, the intrusion of the rolling oil cannot be completely prevented. Based on this knowledge, by providing a sealing device that seals between the fixed shaft and the inner ring, foreign matter such as rolling oil can be prevented from rolling into the bearing.

  The sealing device preferably has an O-ring.

  The sealing device preferably discharges pressurized air between the fixed shaft and the inner ring.

  It is preferable to provide a seal device that seals between the inner ring and the outer ring of the rolling bearing, and to provide a valve body that keeps the pressure in the rolling bearing at a predetermined pressure higher than atmospheric pressure. In such a case, the valve body allows the lubricating oil and gas to be discharged from the inside of the rolling bearing, but prevents foreign matter (for example, rolling oil or the like) from entering from the outside of the rolling bearing. It is preferable. Accordingly, it is preferable to connect the recovery pipe to the valve body, so that the lubricating oil can be easily recovered without providing a vacuum device or the like, and contamination of the surrounding environment can be suppressed at a low cost. Examples of such a valve body include a check valve.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram of a Sendima mill rolling machine to which the lubricating device according to the present embodiment is applied. In FIG. 1, a pair of work rolls 2 are disposed at the center of the housing 1 so as to be vertically opposed to each other with a predetermined gap therebetween. Two first intermediate rolls 3 having larger diameters are in contact with the rear of each work roll 2 so as to be rotatable with respect to the housing 1, and behind the two first intermediate rolls 3 there are three Three second intermediate rolls 4 are in contact with and abutted against the housing 1, and four backup rolls (rotating shafts) 5 are in contact with and abutted behind the three second intermediate rolls 4. It is arranged to be rotatable with respect to.

  From the left side of FIG. 1, when the stainless steel plate SS enters the housing 1 and passes between the pair of work rolls 2, the stainless steel plate SS is rolled to reduce the plate thickness, and then from the housing 1 to the right side of FIG. 1. It is supposed to leave. At this time, an excessive rolling load acts on the work roll 2, which is supported by the first intermediate roll 3, the second intermediate roll 4, and the backup roll 5, so that bending of the work roll 2 is suppressed, A uniform plate thickness can be obtained.

  FIG. 2 is a schematic view of a lubricating device including an oil mist lubricating device that supplies lubricating oil to lubricate the backup roll, and FIG. 3 is a schematic cross-sectional view of the work roll. In FIG. 2, the supply source 6 supplies the bearings in the eight backup rolls 5 through the supply pipe 7. The supply source 6 has a function of atomizing the lubricating oil in the lubricating tank using heated air and discharging it to the supply pipe 7 together with the air, and since it is well known, details are not described.

  In FIG. 3, the backup roll 5 is disposed coaxially with the hollow central shaft (fixed shaft) 5a fixed to the housing 1 (FIG. 1), a plurality of inner rings 5b fitted to the central shaft 5a, and the inner ring 5b. A plurality of outer rings 5c, rollers 5d that are arranged in two rows between the inner rings 5b and the outer rings 5c and roll, and a cage 5e that holds the rollers 5d. The inner ring 5b, the outer ring 5c, the rollers 5d, and the cage 5e constitute a rolling bearing 10. In the present embodiment, the outer peripheral surface of the outer ring 5c directly presses the outer peripheral surface of the second intermediate roll 4, but here also serves as the rotating shaft.

  FIG. 4 is an enlarged cross-sectional view of the rolling bearing 10. FIG. 5 is an enlarged view showing a part indicated by an arrow V in FIG. In FIG. 4, the inner ring 5b is composed of two inner ring half portions 5bh divided in the axial direction. Specifically, each inner ring half portion 5bh has a flange portion 5bh1 extending radially outward at one end, and a plurality of crescent-shaped notches 5bh2 are formed on the end surface of the other end. Further, an enlarged end portion (stepped portion) 5bh3 is formed on the inner periphery of the outer end of the inner ring half portion 5bh. Here, an O-ring described later is incorporated. The inner ring 5b is formed by combining the pair of inner ring half parts 5bh with the notches 5bh2 butted together.

  In FIG. 3, the supply pipe 7 of FIG. 2 is connected to the opening end of the bag hole 5a1 formed inside the central shaft 5a. Further, the central shaft 5a is formed on the outer peripheral surface with a hole 5a2 communicating with the bag hole 5a1 facing the notch 5bh2 (FIG. 4) of the inner ring half 5bh. An accelerating member 9 having a small-diameter hole with a reduced cross-sectional area is attached in each hole 5a2.

  In FIG. 4, an outer ring 5c, which is a single hollow cylinder, forms a flange portion 5c1 extending radially inward at the center. The rollers 5d in each row are arranged such that the end surface on the outer side in the axial direction faces the flange portion 5bh1 of the inner ring half 5bh, and the end surface on the inner side in the axial direction faces the flange portion 5c1 of the outer ring 5c. During operation, the rollers 5d are guided by the flange portions 5bh1 and 5c1. A cage 5e formed by protruding comb teeth in a cantilevered manner on both sides in the axial direction holds rollers 5d between the comb teeth. A sealing device 8 is disposed between the flange portions 5bh1 of both inner ring half portions 5bh and the end surfaces of the outer ring 5c.

  In FIG. 5, the sealing device 8 is disposed adjacent to the roller 5d and is fitted to the outer periphery of the inner ring 5b and extends to the outer ring 5c. The shield plate 8b is in the form of a donut plate fixed to the outer ring 5c by the retaining ring 8a. It consists of a cored bar 8c, and a seal lip 8d made of resin or rubber, which is fixed to the inner wall of the cored bar 8c and extends toward the shield plate 8b, and whose end is in contact with the entire circumference. A hole 8c1 penetrating in the axial direction is formed in the metal core 8c, and a valve body 11 is attached to the inside thereof.

  FIG. 6 is a cross-sectional view of the valve body. The valve body 11 includes a hollow cylindrical housing 11a having a discharge passage 11a1 and a valve seat 11a2 that are open to the outside, a poppet valve 11b having a hemispherical head portion 11b1 disposed in the housing 11a, and an end of the housing 11a. And a coil spring 11d that urges the head 11b1 of the poppet valve 11b toward the valve seat 11a2 with respect to the support plate 11c.

  When the difference between the pressure inside the sealing device 8 and the pressure outside the valve body 11 is less than a predetermined pressure, the head 11b1 of the poppet valve 11b contacts the valve seat 11a2 by the biasing force of the coil spring 11d. Will remain. On the other hand, when the internal pressure of the sealing device 8 increases to a predetermined pressure or more with respect to the external pressure, the head portion 11b1 of the poppet valve 11b is detached from the valve seat 11a2 and is lubricated from the inside of the rolling bearing 1. Oil and air can be discharged.

  FIG. 7 is a cross-sectional view showing a state in which the rolling bearing 10 is incorporated in the central shaft 5a. As shown in FIG. 7, an O-ring OR is disposed at the end diameter-enlarged portion 5bh3 of the inner ring 5b, and seals between the central shaft 5a and the inner ring 5b. The O-ring OR constitutes a sealing device. A cylindrical acceleration member 9 having a small-diameter hole 9a at the center is fitted and disposed in the hole 5a2 of the central shaft 5a. The cross-sectional area of the small diameter hole 9a is smaller than the passage cross-sectional area of the notch 5bh2 with which the inner ring half 5bh is abutted.

  Next, an aspect of oil mist lubrication according to the present embodiment will be described. From the supply source 6 shown in FIG. 2, mist-like lubricating oil and air are supplied into the bag hole 5 a 1 of the central shaft 5 a of the backup roll 5 through the supply pipe 7. The mist-like lubricating oil and air supplied here are discharged through the acceleration member 9 into the notch 5bh2 of the inner ring half 5bh. At this time, the small-diameter hole 9a (FIG. 7) of the acceleration member 9 is discharged. By passing, the flow velocity is increased, and further, the mist-like lubricating oil collides with the cage 5e and drops into a liquid to lubricate the roller 5d and the rolling surface.

  Here, the air and lubricating oil charged between the inner ring 5b and the outer ring 5c are finally discharged from the valve body 11, but until the predetermined pressure is reached, the air and the lubricating oil are between the inner ring 5b and the outer ring 5c. Stored. The tightening force of the seal lip 8d of the seal device 8 is high enough to maintain the sealing even when the pressure between the inner ring 5b and the outer ring 5c reaches a predetermined pressure (for example, 10 kPa). Therefore, for example, even when the rolling bearing 10 is immersed in rolling oil or the like, the rolling oil or the like does not enter the inside via the contact portion of the seal lip 8d, and the valve body 11 is non-returned. Due to the valve effect, the rolling oil or the like does not enter the inside through the valve body 11. On the other hand, the air and lubricating oil inside the rolling bearing 10 are discharged only from the valve body 11 and are hardly discharged from other parts.

  When the pressure between the inner ring 5b and the outer ring 5c becomes a predetermined pressure, the air filled therein and the lubricating oil used for lubricating the rollers 5d pass through the inner diameter side of the shield plate 8b, and the cored bar. It passes through the hole 8c1 of 8c and is discharged from the valve body 11. Thereby, fresh lubricating oil can always be supplied to the rolling bearing 10. Here, as shown by a dotted line in FIG. 5, if a housing-like receiving part is hermetically attached to the outside of the valve body 11, the lubricating oil discharged from the valve body 11 can reach the collection tank (not shown) only by the internal pressure. Since it can be recovered, it can be recovered at a low cost without using a separate pump, and contamination of the surrounding environment with the lubricating oil discharged from the valve body 11 is avoided.

  According to the present embodiment, the valve body 11 maintains the pressure in the rolling bearing 10 at a predetermined pressure higher than the atmospheric pressure. Therefore, by maintaining the pressure in the rolling bearing 10 high, an external rolling oil, etc. And foreign matter can be prevented from entering.

  Furthermore, according to the present embodiment, since the space between the central shaft 5a and the inner ring 5b is sealed by an O-ring OR, even when the pressure in the rolling bearing 10 is reduced during maintenance, for example, It is possible to prevent foreign matters such as rolling oil from entering from the gap between the central shaft 5a and the inner ring 5b, and to prevent the lubricating oil in the rolling bearing 10 from being diluted, thereby ensuring a long life. Further, when air and lubricating oil are transferred from the central shaft 5a to the inner ring 5b, leakage from the O-ring OR is suppressed, so that it can be supplied to the rolling bearing 10 with an appropriate pressure.

  In particular, in the case of the configuration shown in FIG. 7, since the O-ring OR can be assembled from the outside in the axial direction of the inner ring 5b, when the inner rings 5b are assembled one by one, the O- of the inner ring 5b that is first inserted into the central shaft 5a. Assembly is possible by inserting the ring OR into the central shaft 5a in advance, then inserting the two inner rings 5b into the central shaft 5a, and finally inserting another O-ring OR into the central shaft 5a. That is, it is not necessary to integrally assemble the inner ring 5b and the O-ring OR, and the O-ring OR is prevented from biting when passing through a groove or hole provided on the outer periphery of the central shaft 5a. Breakage of the ring OR can be suppressed.

  For example, if the urging force of the coil spring 11d can be changed by rotating the support plate 11c to the housing 11a by screwing the support plate 11c of the valve body 11 into the housing 11a, the head portion 11b1 of the poppet valve 11b is moved to the valve seat. The valve opening pressure that separates from 11a2 can be made variable. Thus, if the valve body 11 has a function of adjusting the pressure in the rolling bearing 10, it is not necessary to leak air or the like from the seal lip 8 d of the seal device 8. Therefore, by increasing the tightness of the seal lip, The sealing effect is further enhanced.

  Further, the valve body 11 allows the lubricating oil and gas to be discharged from the inside of the rolling bearing 10, but prevents the entry of foreign matter from the outside of the rolling bearing 10. It is preferable to connect a recovery pipe to the pipe so that the lubricating oil can be easily recovered without providing a vacuum device or the like, and contamination of the surrounding environment can be suppressed at a low cost.

  Further, the minimum cross-sectional area of the supply path for supplying the lubricating oil and gas to the rolling bearing 10 is the cross-sectional area A of the small-diameter hole of the acceleration member 9 as the adjusting mechanism, and the discharge for discharging the lubricating oil and gas from the rolling bearing 10 The minimum cross-sectional area of the path is the opening area B when the head portion 11b1 of the poppet valve 11b is detached from the valve seat 11a2. Here, by setting A> B, the flow rate can be adjusted on the lubricating oil discharge side with the valve body 11, so the flow rate of the lubricating oil and gas supplied to the rolling bearing 10, and the inside of the rolling bearing 10 The pressure can be easily controlled. This is particularly effective to suppress the supply variation of the lubricating oil between the bearings when using a plurality of rolling bearings 10 as shown in FIG. The valve opening pressure can also be adjusted by replacing the valve body 11 with a different urging force of the coil spring 11d. In any case, adjustment or replacement can be achieved by disposing the valve body 11 as the adjusting means on the discharge side as in the present embodiment as compared with the prior art in which the restrictor is disposed on the inner ring side of the rolling bearing. Becomes easy.

  In the present invention, it is necessary to pump mist-like lubricating oil at a higher air pressure than a conventional lubrication device employing oil mist lubrication. However, in oil mist lubrication, it is known that when the supply air pressure is increased, the amount of mist-like lubricating oil contained in the air decreases above a certain air pressure. It is set. However, even if the air pressure is increased, the amount of the lubricating oil does not become zero, and the rolling bearing is dropletized and lubricated with the lubricating oil stored therein, so that it is considered that no particular problem occurs.

  On the other hand, when the air pressure is increased, the amount of air increases, so that the flow velocity of air flowing in the supply pipe increases, and there is a concern that the lubricating oil may drop in the pipe. In this respect, the tube inner diameter may be selected so as not to drop from the relationship between the tube inner diameter, the flow rate, and the flow velocity. Conventionally, since the amount of air passing through the throttle is affected by the shape and pressures before and after, it has been difficult to accurately determine the amount of air. On the other hand, if the flow rate characteristic is determined by the valve body on the discharge side as in the present invention, the flow rate of the air flowing through the supply pipe can be accurately obtained therefrom, and therefore the supply pipe is optimized by optimizing the air flow rate. Can be effectively suppressed.

  In the above embodiment, the valve body 11 is attached to the cored bar 8c of the sealing device 8. For example, as shown by a one-dot chain line in FIG. 5, a discharge passage 5b2 is formed in the inner ring 5b, and the valve body is formed at the open end. By attaching 11, the same effect can be obtained.

  FIG. 8 is a cross-sectional view similar to FIG. 7 according to a modification of the present embodiment. This modification is mainly different from the embodiment shown in FIG. 7 in that the intermediate sleeve 12 is fitted around the central shaft 5a and the intermediate sleeve 12 is further fitted to the inner ring 5b. In addition, if the cross-sectional area of the opening 12a formed in the intermediate sleeve 12 and communicating with the small-diameter hole 9a of the acceleration member 9 is made smaller than the cross-sectional area of the small-diameter hole 9a, the aperture function can be given to the opening 12a. . Since other configurations are the same as those in the above-described embodiment, the description thereof is omitted.

  FIG. 9 is a cross-sectional view similar to FIG. 7 according to a modification of the present embodiment, but is shown in a full cross-section. In the present modification, an oil drain hole 5a3 communicating with the outside is formed in the central shaft 5Aa with respect to the embodiment shown in FIG. 7, and a drain is provided on the opposite side of the notch 5bh2 of the inner ring 5Ab with the roller 5d interposed therebetween. A through hole 5bh4 communicating with the oil hole 5a3 is provided. In such a case, it is not necessary to provide the valve body 11 in the sealing device 8. The lubricating oil that has entered the rolling bearing 10 through the notch 5bh2 lubricates the rolling surface of the roller 5d, and is then discharged to the outside through the through hole 5bh4 and the oil draining hole 5a3, and is collected in a tank (not shown). it can.

  FIG. 10 is a cross-sectional view similar to FIG. 9 according to a modification of the present embodiment. This modification is mainly different from the embodiment shown in FIG. 9 in that an intermediate sleeve 12A is fitted around the central shaft 5a, and further the intermediate sleeve 12A is fitted to the inner ring 5b. The oil drain hole 5a3 of the central shaft 5Aa communicates with the through hole 5bh4 of the inner ring 5Ab through the diameter hole 12b of the intermediate sleeve 12A.

  FIG. 11 is a cross-sectional view similar to FIG. 7 according to a modification of the present embodiment. This modification is different from the embodiment shown in FIG. 7 only in that the sealing device is removed. Therefore, the lubricating oil that has entered the rolling bearing 10 through the notch 5bh2 lubricates the rolling surface of the roller 5d, and then passes between the outer ring 5c and the inner ring 5b and is discharged from both sides. Since other configurations are the same as those in the above-described embodiment, the description thereof is omitted. This modified example is preferably installed in a place where rolling oil or the like is not easily applied.

  FIG. 12 is a cross-sectional view similar to FIG. 8 according to a modification of the present embodiment. This modification is different from the embodiment shown in FIG. 8 only in that the sealing device is removed. Since other configurations are the same as those in the above-described embodiment, the description thereof is omitted.

  FIG. 13 is a cross-sectional view similar to FIG. 11 according to a modification of the present embodiment. In this modification, compared with the embodiment shown in FIG. 11, end diameter-enlarged portions 13 a are formed on the inner periphery of the collar 13 that abuts on both sides in the axial direction of the inner ring 5 Bb. An O-ring OR is disposed in the diameter portion 13a. Therefore, the diameter-expanded part is not formed in the inner ring 5b. The clearance between the outer periphery of the saddle wheel 13 and the inner periphery of the outer ring 5c is small, and air and lubricating oil are discharged while adjusting the clearance. In this modification, the sealing device is constituted by the collar 13 and the O-ring OR.

  FIG. 14 is a cross-sectional view similar to FIG. 7 according to a modification of the present embodiment. In the present modification, a circumferential groove 5bh5 is formed on the inner circumference in the vicinity of both ends of the inner ring 5b, and an O-ring OR is arranged in the circumferential groove 5bh5, compared to the embodiment shown in FIG. As described above, by providing the O-ring OR in the circumferential groove 5bh5, when the rolling bearing 10 is incorporated into the central shaft 5a or disassembled, the O-ring OR is deteriorated due to aging or deterioration. Can also be easily replaced. Such a circumferential groove 5bh5 can also be applied to the modified examples of FIGS.

  FIG. 15 is a cross-sectional view similar to FIG. 9 according to a modification of the present embodiment. In the present modification, a circumferential groove 5bh5 is formed on the inner periphery in the vicinity of both ends of the inner ring 5Bb with respect to the embodiment shown in FIG. Further, an air hole 5a4 that connects the circumferential groove 5bh5 and the outside is formed in the central shaft 5Ba. The circumferential groove 5bh5 and the air hole 5a4 constitute a sealing device. By connecting the air hole 5a4 to a pressurized air source, pressurized air is supplied to the circumferential groove 5bh5 via the air hole 5a4, and is discharged between the inner ring 5Bb and the central shaft 5Ba to give a pressurizing effect. Thereby, it can suppress that foreign materials, such as rolling oil, penetrate | invade from the exterior from the clearance gap between center axis | shaft 5Ba and inner ring | wheel 5Bb, it can suppress that the lubricating oil in the rolling bearing 10 is diluted, and can ensure the lifetime long. . Such a circumferential groove 5bh5 can also be applied to the modified examples of FIGS. 8 to 13. In particular, when an intermediate sleeve is provided, an air hole can be provided in the central shaft or the intermediate sleeve.

  FIG. 16 is a diagram showing another modification. In the inner ring 5Cb of this modified example, neither the end enlarged portion nor the circumferential groove is formed. Instead, a tapered chamfered portion 14a is formed on the inner periphery of the end of the mating member 14 that contacts the end surface of the inner ring 5Cb. The O-ring OR disposed between the inner ring 5Cb and the mating member 14 is accommodated in the chamfered portion 14a and elastically deformed to seal between the central shaft 5a, the inner ring 5Cb, and the mating member 14. It has become. The mating member 14 and the O-ring OR constitute a sealing device.

  The present invention has been described above with reference to the embodiments. However, the present invention should not be construed as being limited to the above-described embodiments, and can be changed or improved as appropriate. As a valve body, not only the type shown in FIG. 6 but a various thing can be used.

It is the schematic of the Sendima mill rolling machine to which the lubrication apparatus concerning this Embodiment is applied. It is the schematic of the bearing apparatus containing the oil mist lubrication apparatus which supplies lubricating oil in order to lubricate a backup roll. It is a schematic sectional drawing of a work roll. FIG. 4 is an enlarged cross-sectional view of the rolling bearing 10. It is a figure which expands and shows the site | part shown by the arrow V of FIG. It is sectional drawing of a valve body. It is sectional drawing concerning the modification of this Embodiment. It is sectional drawing concerning the modification of this Embodiment. It is sectional drawing concerning the modification of this Embodiment. It is sectional drawing concerning the modification of this Embodiment. It is sectional drawing concerning the modification of this Embodiment. It is sectional drawing concerning the modification of this Embodiment. It is sectional drawing concerning the modification of this Embodiment. It is sectional drawing concerning the modification of this Embodiment. It is sectional drawing concerning the modification of this Embodiment. It is sectional drawing concerning the modification of this Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Work roll 3 1st intermediate roll 4 2nd intermediate roll 5 Backup roll 5a, 5Aa, 5Ba Central shaft 5a1 Bag hole 5a2 Hole 5b, 5Ab, 5Bb, 5Cb Inner ring 5bh Inner ring half part 5bh1 Flange part 5bh3 End part Expanded part 5bh4 Circumferential groove 5bh5 Circumferential groove 5b2 Discharge path 5c Outer ring 5c1 Flange part 5d Roller 5e Cage 6 Supply source 7 Supply pipe 8 Sealing device 8a Retaining ring 8b Shield plate 8c Core metal 8c1 Hole 8d Seal lip 9d Bearing 11 Valve body 11a Housing 11a1 Discharge path 11a2 Valve seat 11b Poppet valve 11b1 Hemispherical head 11c Support plate 11d Coil spring 12, 12A Intermediate sleeve 13 Collar ring 14 Counter member OR O-ring SS Stainless steel plate

Claims (3)

A bearing device for use in a roll support device, the rolling bearing having an inner ring fitted to a fixed shaft, and the rolling bearing through the fixed shaft and the inner ring by mixing mist-like lubricating oil with gas. In a bearing device having a lubricating oil supply device to be supplied inside,
A sealing device for sealing between the fixed shaft and the inner ring ;
A seal device that seals between an inner ring and an outer ring of the rolling bearing;
In order to maintain the pressure in the rolling bearing at a predetermined pressure higher than the atmospheric pressure, the sealing device is configured such that when the pressure in the rolling bearing exceeds the valve opening pressure, the lubricating oil and gas from the rolling bearing A valve body that allows discharge is provided, and the valve body includes a housing provided with a discharge passage for lubricating oil and gas, a valve that can shield the discharge passage, and the valve for the rolling bearing. And a spring biased toward the housing from the outside of the bearing.   The bearing device according to claim 1, wherein the sealing device has an O-ring.   The bearing device according to claim 1, wherein the sealing device discharges pressurized air between the fixed shaft and the inner ring.

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