JP2019219032A - Split-type rolling bearing device and its shaft end part sealing ring - Google Patents

Abstract

To stably obtain sufficient seal performance by avoiding that a shaft end part sealing ring of a split-type rolling bearing device is warped due to fixation caused by fitment to an irregular part at a fixed ring side, in particular, by avoiding that contact pressure with an oil seal and a packing becomes unequal, or by avoiding that a fine clearance of a labyrinth seal is unequally deformed.SOLUTION: Shaft end part sealing rings 1 of a split-type rolling bearing device A are arranged at both end parts of the split-type rolling bearing device A which can be split around a shaft, and formed of a ring-shaped raw material which is formed by making end parts of two or more circular arc segments 1a abut on each other via an elastic body 2 composed of a polymer material, and connecting them in a ring shape. The shaft end part sealing ring 1 can be equally arranged at a peripheral groove 6 by the elastic deformation of the elastic body by backlash (clearance) in a peripheral direction at the assembling of the shaft end part sealing rings 1 and the peripheral groove 6, a seal face is not warped, a fine clearance of a labyrinth seal is not deformed unequally, and sufficient seal performance can be stably obtained.SELECTED DRAWING: Figure 1

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring for sealing a shaft end portion of a split type rolling bearing device that can be split around a shaft and a split type rolling bearing device.

2. Description of the Related Art In general, a split-type rolling bearing device is known in which a rolling bearing is configured to be able to be divided into a plurality of segments around an axis and can be attached from a shaft radial direction.
For example, rolling bearings that support rolls used in continuous casting equipment, crankshafts that convert reciprocating motion of pistons of engines of automobiles and ships into rotary motion, and rotating shafts of pile drivers of construction machinery, etc. It is provided so that it can be divided.

  Among the rolls used in continuous casting equipment, those in which the center part of the roll is a punch with a small diameter are used as drive rolls, including such rolls, when a part or the whole is reduced in diameter. To compensate for insufficient strength, important parts of the roll are supported by rolling bearing devices.

  As the bearing device for supporting the central portion of the roll, for example, a split type bearing device including a full roller type split bearing is used, and it is necessary to incorporate the bearing from a radial direction perpendicular to the axis of the roll. , The inner ring, the housing, the packing, the seal and the like each have at least one or more radial cuts around the axis and are divisible.

A schematic structure of a split type rolling bearing device including a full roller type split bearing will be described with reference to FIGS. 1 and 2. A rolling bearing device A is a punch type roll B which is divided into two parts which are fitted to a small diameter portion B ₁ thereof. The inner ring 7, the cylindrical roller 11, the outer ring 4, the upper housing 3 and the lower housing 5 that hold the inner ring 7 and the outer cylindrical roller 11 outside thereof, and the shaft end sealing ring 1 (also called a labyrinth ring). ), An oil seal 8 and a packing 9 are provided, and the housing including the upper housing 3 and the lower housing 5 has a structure that can be vertically divided into two.
Then, each of both end surfaces facing the punch-type small-diameter portion B ₁ on both sides of the large diameter portion of the roll B (roll neck) B _2, the labyrinth groove 12 end of the shaft end portion sealing ring 1 is slight They are fitted with a gap therebetween, thereby forming a labyrinth seal (Patent Document 1).

  It is also known that a pair of split outer rings is provided with a cushioning piece made of synthetic resin on one end face thereof. Even if there is a step in the joining portion of the split outer ring, the rotating rolling element is not stepped. It is possible to get over a buffer piece made of a synthetic resin that is softer than a metal material at a part, and to reduce noise and vibration generated by a collision with a step (Patent Document 2).

JP 2009-180310A JP 2010-077999 A

  However, the conventional split type rolling bearing device described above does not solve the following problems with the shaft end sealing ring (labyrinth ring). That is, when the shaft end sealing ring is fitted in an unevenly compressed portion such as a groove formed on the stationary wheel in an elastically compressed state, the shaft end sealing ring is deformed by the compressive force of the fitted portion, and the shaft end sealing ring is moved toward the rotating wheel. There is a problem that the contact pressure with the held oil seal or packing becomes uneven, and the sealing performance is impaired.

  In particular, a labyrinth seal that is a non-contact seal having a small gap is provided by partially inserting the end of the shaft end sealing ring into the labyrinth groove formed on each of the opposite end faces of the punch-type roll. Also, the deformation of the shaft end sealing ring due to the compressive force of the fitting portion described above causes a problem that the minute clearance of the labyrinth seal becomes uneven and the sealing performance is impaired.

  Accordingly, an object of the present invention is to solve the above-mentioned problems, and to prevent a shaft end seal ring of a split type rolling bearing device from being distorted by fitting to an uneven portion on a fixed wheel side, and particularly to an oil seal or a packing. By ensuring that the contact pressure does not become uneven and that the small gap of the labyrinth seal does not deform unequally, the sealing ring at the shaft end can obtain a stable and sufficient sealing performance. is there.

  In order to solve the above-mentioned problem, in the present invention, a fitting portion that can be fitted and fixed to an uneven portion provided on a fixed wheel side of a shaft end portion of a split type rolling bearing device that can be divided around an axis; An elastic body made of a ring-shaped material having a sealing surface sealed by a sealing device provided on the rotating wheel side of the split type rolling bearing device, and having two or more arc-shaped segments having ends each formed of a polymer material. Thus, a ring for sealing the shaft end portion of the split type rolling bearing device which is connected in the form of a ring by abutting each other is provided.

  The shaft end sealing ring of the present invention configured as described above is configured such that the end faces of two or more arc-shaped segments are connected to each other via an elastic body made of a polymer material to form a ring. The end sealing ring is stretched outward in the radial direction, that is, is tightly stretched without loosening, so that the position to be fitted radially and circumferentially to the uneven portion provided on the fixed wheel side is determined, and the shaft end portion is formed. The sealing ring can be arranged uniformly on the uneven portion.

  Therefore, the distortion appearing on the sealing surface of the shaft end sealing ring is reduced, and the sealing surface of the shaft end sealing ring can face the surface with less distortion with respect to the sealing device, and the stability by the sealing device can be improved. And sufficient sealing performance can be obtained.

  Since the seal device is a seal device that is sealed in a liquid-tight manner by a contact seal, a non-contact seal, or both seal mechanisms, the contact pressure with the oil seal and the packing becomes uniform, and a small clearance of the labyrinth seal is provided. Becomes uniform, and the sealing mechanism stably exhibits sufficient sealing performance.

  In addition to the case where the uneven portion on the fixed wheel side is formed on the fixed wheel of the raceway ring, the uneven portion can be provided on a housing integral with the fixed wheel, for example, provided integrally with a part of the outer ring which is a fixed wheel. It may be an uneven portion such as a groove or a recess, a ridge or a protrusion formed in the housing.

  In addition, it is not preferable that these surfaces form the same plane, for example, the position of the surface where the ends of the arc-shaped segments abut each other overlaps with the division position of the housing or the like. This is because the abutting end faces of the arc-shaped segments are easily deformed so as to spread radially outward.

  Then, it is preferable that the surface where the ends of the arc-shaped segments abut against each other is arranged so as not to form the same plane as the divided surface on the fixed wheel side of the shaft end of the split type rolling bearing device. With this configuration, the surface where the ends of the arc-shaped segments abut against each other is located at a position distant from the fixed-wheel-side divided surface, or a part of the arc-shaped segment straddles the divided surface. Since the states or the planes are arranged in an intersecting state, in such a state, the abutting end faces of the arc segments do not spread outward in the radial direction.

  In addition, the surface where the ends of the arc-shaped segments connected to each other in a ring shape abut each other is prepared to have an end surface having a surface roughness equivalent to the turning finish. The anchor effect by the rough surface is preferable because it can be held on the end face of the arc-shaped segment with good adhesion.

  Then, using the ring for sealing the shaft end portion of the split type rolling bearing device manufactured as described above, a split type rolling bearing device that can be split around the shaft can be obtained. The contact pressure between the bearing and the packing does not become uneven, and the minute gap of the labyrinth seal does not deform unequally, so that a split type rolling bearing device having stable and sufficient sealing performance can be configured.

  According to the present invention, when forming a shaft end sealing ring of a split type rolling bearing device, end faces of two or more arc segments are joined to each other via an elastic body formed of a polymer material to form a ring. Since it is provided in a linked manner, the circumferential play (gap) of the ring of the fitting portion by the fitting of the shaft end sealing ring to the uneven portion on the fixed ring side is uniformly arranged on the uneven portion by the elastic deformation of the elastic body. The seal surface will not be distorted, the contact pressure with the oil seal or packing will not be uneven, and the small gap of the labyrinth seal will not be deformed unequally. There is an advantage that the shaft end sealing ring can provide sealing performance.

  Further, by using such a shaft end sealing ring, a split type rolling bearing device having the above-mentioned advantages can be obtained.

FIG. 2 is a cross-sectional view of a partly cut-away type rolling bearing device showing a shaft end sealing ring according to an embodiment. 1. Sectional drawing which expands and shows the principal part of FIG. III-III sectional view of FIG. 1 Perspective view of a shaft end sealing ring according to an embodiment. Axial end view showing an example of an arc-shaped segment provided with an elastic body Axial end view showing another example of an arc-shaped segment provided with an elastic body Explanatory drawing which shows the arrangement | positioning of the division surface of a shaft end sealing ring and housing of embodiment.

An embodiment of the present invention will be described below with reference to the accompanying drawings.
As shown in FIGS. 1-4, the shaft end sealing ring 1 of the split type rolling bearing device A of the embodiment is provided at both ends of the split type rolling bearing device A which can be split around the shaft. It is made of a ring-shaped material in which the ends of two or more arc-shaped segments 1a are joined to each other via an elastic body 2 made of a polymer material and connected in a ring shape.

Then, a rectangular flange-shaped ridge 1b provided on the outer periphery of the ring-shaped material is provided in a circumferential groove 6 formed in the upper housing 3 and the lower housing 5 integral with the outer ring 4 of the fixed type rolling bearing device A. They are fitted and fixed in an elastically compressed state.
In addition, the shaft end sealing ring 1 includes a first sealing device including an oil seal 8 and a packing 9 provided on the inner ring 7 on the rotating wheel side, and a second sealing device including a labyrinth seal 10. With these two sealing devices, the sealing surfaces at key points are sealed in a liquid-tight manner.

Structures other than the shaft end sealing ring 1 of the split mold rolling bearing device A may employ a general split type rolling bearing device, fitted to the small-diameter portion B ₁ of the punch roll B for continuous casting facilities FIG. The split-type rolling bearing device A is, for example, a full roller type having excellent load resistance, and includes an inner ring 7 and a cylindrical roller 11 rotatably supported by the inner ring 7.

  The shaft end sealing ring 1 is provided with a flange-shaped projection 1b having a flange-like shape that can be fitted into a square groove-shaped circumferential groove 6 provided on the fixed wheel side of the shaft end of the split type rolling bearing device A. , And a fitting portion to the square peripheral groove 6.

  The form of the concave-convex portion provided on the fixed wheel side includes not only the illustrated rectangular circumferential groove 6 but also a triangular dovetail groove, a pentagonal or more rectangular or circular groove, an elliptical groove, an irregular groove, or a local concave portion. They may be arranged or randomly scattered, and such well-known concave shapes may be provided. Further, not only such a concave shape but also a convex shape having a known shape similar to that described above may be used in combination, or may be provided instead of the concave shape.

  With respect to the fitting portion, not only the illustrated ridge 1b having a rectangular cross section, but also a projection or recess such as a ridge having a well-known shape that can be fitted and fixed to the above-described uneven portion having a well-known shape can be provided. .

  The oil seal 8 is made of oil-resistant rubber, has a well-known ring shape, and is slidably contacted with a sealing surface of the inner diameter of the shaft end sealing ring 1. The oil seal 8 preferably has one or more seal lips (not shown) in order to obtain stable sealing properties. For example, a seal having a double seal lip having a V-shaped cross section can be adopted. Further, a seal lip made of elastic rubber reinforced with a metal ring may be integrally formed around the periphery, or a composite material incorporating a spring for assisting the seal lip may be used.

  Although the packing 9 is illustrated as a gland packing having a rectangular cross section, other well-known shapes such as a V-shaped, U-shaped, and Y-shaped cross-section can be used for a rotating seal. It is preferable to configure the first sealing device by using either the packing 9 or the oil seal 8 described above, or both.

The housing includes an upper housing 3 also serving as an outer ring, and a lower housing 5, and has a structure that can be divided into two parts in FIG.
The end surface of the large-diameter portion B ₂ of a pair of opposite sides of the small-diameter portion B ₁ of the punch roll B, labyrinth grooves 12 (see FIG. 2) is formed in an annular shape around an axis, the axis here A labyrinth seal 10, which is a second sealing device, is provided by fitting an end of the end sealing ring 1 in a non-contact state through a minute gap.

  The sealing surface of the shaft end portion sealing ring 1 which is liquid-tightly sealed by using such a second sealing device and the above-mentioned first sealing device is slidably contacted with a contact seal as the first sealing device. The surface and the surface facing the non-contact seal as the second sealing device with a small gap therebetween.

  As shown in FIG. 4, a shaft end sealing ring 1 is formed by abutting, via an elastic body 2 formed of a polymer material, longitudinal end surfaces of arc-shaped segments 1a divided into two around an axis. It is connected in a shape.

  As the polymer material forming the elastic body 2, it is preferable to adopt a polymer material having an elastic modulus lower than that of the shaft end sealing ring so that the distortion of the fitting portion can be sufficiently reduced by the elastic deformation of the elastic body. It is preferable to make

  As specific examples of the polymer material constituting the elastic body, an elastic body made of a composite material using a synthetic resin, rubber, another elastomer, or the like, or an elastic coil or a metal spring in combination can be employed.

  Examples of the synthetic resin include polyamide (PA), polyacetal (POM), polyurethane (PUR), polybutylene naphthalate (PBN), and tetrafluoroethylene resin (PTFE). It is preferable to employ the above excellent ones.

As the rubber, it is preferable to use a rubber having excellent wear resistance, such as a polybutadiene rubber, a butadiene / acrylonitrile rubber, and a chloroprene rubber.
Examples of the rubber having excellent oil resistance that can be used for the elastic body include nitrile rubber, hydrogenated nitrile rubber, acrylic rubber, ethylene propylene rubber, styrene butadiene rubber, silicone rubber, and fluoro rubber such as perfluoroelastomer. .
The above-mentioned polymer material can also be used as the oil seal 8 and the packing 9 of the first sealing device described above.

  As shown in FIGS. 5 and 6, the elastic body 2 is integrated with one end (FIG. 5) or both ends (FIG. 6) of each arc-shaped segment 1a before assembly by bonding or molding by molding. It is preferable to provide the shaft end sealing ring 1 and the split-type rolling bearing device A easily by assembling. Further, the elastic body 2 can be provided during the assembling process by press-fitting between the ends of the arc-shaped segments of a polymer material having an amorphous shape or a molded body.

  As shown in FIG. 7, the surface of the arc-shaped segment 1a where the ends abut each other via the elastic body 2 forms the same plane as the split surface 13 of the shaft end of the split type rolling bearing device A on the fixed wheel side. In order to avoid this, they are arranged at different positions.

  Since the position where the end faces of the arc-shaped segments 1a abut against each other is located so as not to overlap with the dividing surface 13 of the upper housing 3 and the lower housing 5, the arc-shaped segment 1a moves the dividing surface 13 radially outward. It does not move.

  When the ends are connected in a ring shape, the ends of the arc-shaped segments 1a are preferably end faces having a surface roughness equivalent to the turning finish. In this case, the elastic body formed of a polymer material is preferably used. Can be held on the end face of the arc-shaped segment with good adhesion by the anchor effect.

  Specific examples of the surface roughness equivalent to the turning finish include a surface roughness Ra of 0.5 to 20.0 μm, and more preferably 1.0 to 15.0 μm.

  In order to form the end portion of the arc-shaped segment 1a to have a surface roughness equivalent to the turning finish, when the arc-shaped segment is divided from a metal ring such as a steel material, a known wire cut electric discharge machining or the like is used. By adopting the mechanical processing of the above, it can be formed efficiently.

  In this way, the split type rolling bearing device A manufactured by assembling the components constituting the shaft end portion sealing ring 1 has a play in the circumferential direction when the shaft end portion sealing ring 1 and the circumferential groove 6 are assembled. The gap 1) can be uniformly arranged in the circumferential groove 6 by the elastic deformation of the elastic body, and the ring seal surface does not distort, the contact seal sealing state is stabilized, and especially the labyrinth seal. The minute gap does not deform unequally, and stable and sufficient sealing performance can be obtained.

  The shaft end sealing ring and the split rolling bearing device of the split type rolling bearing device of the present invention are used, for example, as rolling bearings for supporting rolls of a continuous casting facility, and a rolling bearing for supporting a propulsion shaft of a ship screw, Or as a relatively large rolling bearing device that requires maintenance that can be performed by attaching and detaching the rolling bearing from the radial direction instead of the axial direction, such as a rolling bearing that supports the rotating shaft of a screw type pile driver that is a construction machine It has general versatility that can be used.

DESCRIPTION OF SYMBOLS 1 Shaft end seal ring 1a Arc-shaped segment 1b Ridge 2 Elastic body 3 Upper housing 4 Outer ring 5 Lower housing 6 Circumferential groove 7 Inner ring 8 Oil seal 9 Packing 10 Labyrinth seal 11 Cylindrical roller 12 Labyrinth groove 13 Splitting surface A Split type Rolling bearing device B Punch type roll B ₁ Small diameter section B ₂ Large diameter section

Claims (7)

A fitting portion that can be fixed by being fitted to an uneven portion provided on the fixed wheel side of the shaft end of the split type rolling bearing device that can be divided around the shaft;
A seal surface that is sealed by a seal device provided on the rotating wheel side of the split type rolling bearing device, comprising a ring-shaped material,
A ring for sealing a shaft end portion of a split type rolling bearing device in which ends of two or more arc-shaped segments are connected to each other in a ring shape by abutting each other via an elastic body made of a polymer material.   The ring for sealing a shaft end portion of a split type rolling bearing device according to claim 1, wherein the seal device is a seal device including a contact seal, a non-contact seal, or a seal mechanism of both of them.   The ring for sealing a shaft end portion of a split-type rolling bearing device according to claim 1 or 2, wherein the non-contact seal is a labyrinth seal.   The shaft end of the split type rolling bearing device according to any one of claims 1 to 3, wherein the uneven portion provided on the fixed wheel side is an uneven portion provided on a housing integrated with the fixed wheel of the split type rolling bearing device. Ring for sealing.   5. The surface in which the ends of the arc-shaped segments abut each other is a surface arranged so as not to form the same plane as the divided surface of the shaft end of the split type rolling bearing device on the fixed wheel side. A ring for sealing a shaft end portion of the split type rolling bearing device according to any one of the above.   The ring for sealing a shaft end of a split type rolling bearing device according to any one of claims 1 to 5, wherein an end of the arc-shaped segment is an end formed to have a surface roughness equivalent to turning finish.   A split type rolling bearing device capable of splitting around a shaft provided with a shaft end sealing ring of the split type rolling bearing device according to any one of claims 1 to 6.

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