JP2001020961A - Sealed rolling bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily mount a sealing device without necessitating striking action in case of mounting by incorporating the sealing device into a mounting groove formed between two adjacent inner wheel joining parts by elastically deforming. SOLUTION: An annular seal member 7 made of an elastic body such as rubber for forming a sealing device 6 is fitted into a mounting groove 5 in a condition in which both end diameter direction protrusion parts disposed on outer periphery of the seal member 7 are push-pressed to groove bottom parts 5a, 5b and while having some clearance from the side wall surfaces 5c, 5d. The seal member 7 has a diameter larger than each diameter of the groove bottom parts 5a, 5b of the mounting groove 5, and inserted into the mounting groove 5 while contracting the diameter of the seal member 7 inward a diameter direction by elastic deformation, in the case of fitting. After insertion, the seal member 7 becomes in such a condition that the diameter is brought into pressure-contact with the groove bottom parts 5a, 5b and its condition is held, by shape restoration force generated by means of elasticity of an elastic body seal member. It is thus possible to easily carry out mounting work, and it is also possible to obtain a good sealing effect since the sealing device is brought into pressure-contact with the inner wheel mounting groove surfaces by elastic restoration force and its condition is held.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic rolling bearing mounted on a work roll neck of a steel rolling machine, for example, and more particularly, to a hermetic rolling bearing surely prevented from falling off from a mounting groove of the sealing device. It relates to a bearing device.

[0002]

2. Description of the Related Art A sealed rolling bearing device, for example, a four-row tapered roller bearing device, which is mounted on a work roll neck of a steel rolling machine, is juxtaposed on the outer peripheral surface of a shaft 1, which is a work roll, as shown in FIG. Two inner races 2a and 2b, and four rows of rolling elements 3a and 3b on the outer peripheral side of the inner races 2a and 2b.
Outer rings 4a, 4 axially juxtaposed via 3c, 3d
b, 4c.

[0003] In this sealed rolling bearing device, a sealing device arranged in the middle of the bearing is provided, for example, in an opposing portion of the inner rings 2a, 2b so as to seal between a plurality of inner rings 2a, 2b arranged in the axial direction. It is mounted in an annular mounting groove (also referred to as an inner ring inner circumferential groove) 5 provided on the peripheral surface, and is conventionally configured as shown in FIG.

That is, a seal lip 56 that is in contact with the other inner ring 2b is integrally formed with a seal body 55 made of a rubber-like elastic material that is fitted on the inner peripheral side of one inner ring 2a in the mounting groove 5. A metal reinforcing ring 57 is embedded inside the seal body 55 so as to firmly fix the seal body 55 to the one inner ring 2a. The metal reinforcing ring 57 has a rigidity that does not easily elastically deform due to its function, and does not have a spring property.

[0005]

However, according to the above-mentioned conventional sealing device (bearing intermediate seal), since the metal reinforcing ring 57 does not have a spring property, this sealing device is mounted on the bearing device 1. The mounting groove 5 of one inner ring 2a
It is necessary to drive the sealing device from one side in the axial direction using a press or a hammer, so that the driving operation must be performed before the inner rings 2a and 2b are arranged in the axial direction. Therefore, the assembling procedure of the bearing device 1 is limited such that the sealing device driving process is performed first, and the inner ring paralleling process is performed afterward. Therefore, there is a problem that the workability of device assembly is poor due to this. . Further, there is a problem in that the driving operation with a hammer or the like takes too much time, and furthermore, the reinforcing ring 57 may be distorted due to a striking force at the time of driving.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a sealed rolling bearing device having a sealing device which can be easily mounted without requiring a driving operation for mounting.

[0007]

According to a first aspect of the present invention, there is provided a hermetic type rolling device which supports a plurality of rolling elements radially inward and has a plurality of inner rings fitted on an outer peripheral surface of a shaft. A mounting groove for mounting a sealing device is formed between the joints of the inner ring, and the sealing device is elastically deformed to be mounted in a mounting groove formed between the two inner ring joints, and the bottom of the mounting groove is formed by elastic restoring force. Alternatively, it is held in pressure contact with a groove forming surface such as a side wall surface.

In order to achieve the above object, in the sealed rolling bearing device according to claim 2, an elastically deformable holding member is provided in the sealing device for enhancing a holding force of the sealing device in the mounting groove. It is.

According to the second aspect of the present invention, a spring is provided in the sealing device so as to enhance the holding force in the mounting groove without obstructing the easiness of the mounting operation of the first aspect. And a holding member having characteristics. As the holding member, for example, there is a coil spring whose circumference is set to be shorter than the natural length. The coil spring can be elastically deformed, and does not hinder the elastic deformation of the entire sealing device, thereby facilitating the mounting operation. After the assembly, the extension force of the coil spring acts as a holding force of the sealing device in the mounting groove, thereby preventing the sealing device from falling off. The holding member is not limited to a coil spring, and may be any member such as a cylindrical metal ring having spring properties, a split mandrel, or the like, as long as the holding force in the mounting groove is enhanced without hindering the incorporation of the sealing device.

According to a third aspect of the present invention, there is provided a sealed rolling bearing device, wherein a falling-off preventing device is provided for preventing the sealing device from falling out of a mounting groove.
According to the bearing device according to the third aspect, since the mounting groove between the inner rings is provided with a falling-off preventing device (for example, a rib or an inclined surface) for preventing the sealing device from falling off from the mounting groove,
It is possible to increase the holding force of the sealing device in the mounting groove, and it is possible to reliably prevent the sealing device from falling off.

Further, when the sealing device is mounted in the mounting groove, the sealing device, which is generally made of an elastic material such as rubber, can be mounted while shrinking. ) Does not hinder the mounting operation.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sealed rolling bearing device according to an embodiment of the present invention will be described below with reference to the drawings. In each of the embodiments described below, for example, in a sealed rolling bearing device mounted on a work roll neck of a steel rolling device as shown in FIG. 18, an inner ring joint portion juxtaposed and fitted adjacent to a rotating shaft is used. It is incorporated in the mounting groove 5 formed therebetween, and parts different from FIG. 18 are mainly shown and described.

(First Embodiment) FIG. 1 is a sectional view of an essential part of a sealed rolling bearing device according to a first embodiment of the present invention.

In the sealed rolling bearing device according to the first embodiment, the mounting groove 5, which is an annular groove formed on the inner side in the radial direction of the joint portion where the inner rings 2a and 2b are in contact with each other, is a groove bottom 5a on the inner ring 2a side. A groove bottom portion 5b on the inner ring 2b side, a groove side wall surface 5c formed on the inner ring 2a side, and a groove side wall surface 5d formed on the inner ring 2b side.

In the mounting groove 5, an annular seal member 7 made of an elastic material such as rubber for forming the sealing device 6 has radially projecting portions on both ends of its outer periphery pressed against the groove bottom portions 5a and 5b, respectively. And it is fitted with a slight gap with the groove side wall surfaces 5c, 5d. The seal member 7 has a larger diameter than the diameter of the groove bottoms 5a and 5b of the mounting groove 5 in a natural state before being fitted into the mounting groove 5, and is contracted radially inward by elastic deformation when fitted. After the insertion, the outer peripheral portion is pressed against the groove bottoms 5a and 5c by the shape restoring force due to the elasticity of the elastic seal member and is held in the mounting groove, and the state shown in FIG. 1 is obtained.

FIG. 2 shows a first modification of the first embodiment. In this example, the outer peripheral surface of the seal member 7 is the same circumferential surface, and therefore, the outer peripheral surface is provided on the groove bottoms 5a and 5b of the mounting groove 5. It is pressed and held as a whole. The shape and structure of the seal member 7 according to the first modification are the same as those of the seal member 7 in FIG. 1 except for the above.

FIG. 3 shows a second modification of the first embodiment. The annular seal member 7 according to the second modified example has protrusions 7a and 7b that protrude obliquely outward in a circular truncated cone shape at both ends in the radial direction and the axial direction, and protrude in an oblique outward direction. Are in pressure contact with the groove bottom 5a and the groove wall 5c, respectively, and the corners formed at the tips of the protrusions 7b are in pressure contact with the groove bottom 5b and the groove wall 5c, respectively. The diameter and the axial length of at least the protrusions 7a and 7b of the seal member 7 according to the second modification are larger than the groove bottom diameter and the axial length of the mounting groove 5 in a natural state. When fitted into the mounting groove 5, it is elastically compressed and inserted.

FIG. 4 shows a third modification of the first embodiment of the present invention. The elastic seal member 7 according to the third modified example has an asymmetric cross-sectional shape, and the outer peripheral portion and the left side surface portion of the base 7c are pressed against the groove bottom 5a and the groove wall 5c of the mounting groove 5, respectively. In addition, the tip of the protruding piece 7d extending in the axial direction from the base 7c is pressed against the groove wall 5d.

The relationship between the size of the engaging seal member 7c and the mounting groove 5 in the third modification is the same as that in the second modification.

FIG. 5 is a sectional view of an elastic annular seal member according to a fourth modification of the first embodiment of the present invention. The sealing member 7 according to the fourth modification has a symmetrical cross-sectional shape as in the examples shown in FIGS. 1 to 3, but in this example, the outer peripheral surface is pressed against the groove bottoms 5 a and 5 b of the mounting groove 5. In addition, the left and right ends are pressed against the groove walls 5c and 5d, respectively. 4th
The dimensional relationship between the seal member 7 and the mounting groove 5 according to the modification is the same as in the above-described example.

(Second Embodiment) FIG. 6 is a sectional view of a main part of a second embodiment of the present invention, and FIGS. 7 to 10 are first to fourth modifications of the second embodiment, respectively. Is shown.

A tubular groove 8 is formed radially inside the annular sealing member 7 made of an elastic material such as rubber according to the second embodiment shown in FIG. A coil spring 9 is provided as a holding member for enhancing the holding force of the seal member 7 in the mounting groove 5. Other shapes and structures of the seal member 7 are the same as those in the example of FIG.

FIG. 7 is a sectional view of a main part according to a first modification of the second embodiment of the present invention. In the case of the seal member 7 according to the first modification, an elastic metal ring 9 'is provided instead of the coil spring 9 of the seal member 7 shown in FIG. Other shapes and structures of the first modification are shown in FIG.
This is the same as the second embodiment shown in FIG.

In a second modification of the second embodiment of the present invention shown in FIG. 8, an elastic cylindrical member or a single-part cylindrical member 9 is used instead of the coil spring 9 of the seal member 7 shown in FIG. Is provided as a holding member.
Other shapes and structures of the modified example are the same as those of the second embodiment in FIG.

The third embodiment of the present invention shown in FIG.
In the elastic annular seal member 7 of the modified example, the two coil springs 9a, 9 are equidistant from the circumferential center line.
b is provided as a holding member.

The fourth embodiment of the present invention shown in FIG.
The elastic annular seal member 7 according to the modification is shown in FIG.
The shape is almost the same as that shown in FIG.
A coil spring 9 is provided on the inner peripheral side as a holding member.

In the above-described second embodiment and its modifications, the holding members such as the coil springs can be elastically deformed, so that the elastic deformation of the entire sealing device is not hindered, and the mounting operation can be facilitated. After the assembly, the elastic restoring force of the holding member acts as a holding force of the sealing device in the mounting groove, thereby preventing the sealing device from falling off.

(Third Embodiment) FIG. 11 is a partial sectional view of a sealed type rolling bearing device according to a third embodiment of the present invention. FIG. It is a figure which shows the state which carried out the compression deformation | transformation for incorporating.

In the sealed rolling bearing device according to the third embodiment, a pair of ribs 10 are provided on the inner peripheral sides of both side walls of the mounting groove 5.
a, 10b (drop-off prevention devices) are formed. By these ribs 10a and 10b, the holding force of the sealing device 6 in the mounting groove 5 can be increased, and the falling off of the sealing device 6 can be reliably prevented.

When the sealing device 6 is mounted in the mounting groove 5, the annular sealing member 7 made of an elastic material such as rubber can be mounted while shrinking, and the mounting operation is hindered by the ribs 10a and 10b. Never. Further, by forming inclined surfaces on both side surfaces of the seal member 7, mounting work can be further facilitated.

After the sealing device 6 has been once mounted in the mounting groove 5, the sealing member 7 is replaced with the ribs 10a, 1a.
The rib 10a and 10b do not hinder the restoration of the seal member 7 by restoring inside the mounting groove 5 and being able to adhere to the inside of the mounting groove 5.

When a holding member, for example, a coil spring 9 for holding the seal member 7 by pressing it into the mounting groove 5 by elastic force is mounted in the groove 8 of the seal member 7, the seal member 7 And the sealing device 6 can be mounted in the mounting groove 5 even after the inner rings 2a and 2b are assembled.

Further, the outer diameter surfaces of the ribs 10a and 10b
By making the interval between the inner diameter surface of the mounting groove 5 and the height of the sealing member 7 smaller, the sealing force of the sealing member 7 into the mounting groove 5 can be increased, and the sealing performance can be improved.

FIG. 13 shows a first embodiment of the third embodiment of the present invention.
It is sectional drawing of the sealing type rolling bearing device concerning a modification.

In the first modified example of the third embodiment, the shape of the both side walls of the mounting groove 5 is straight, but L-shaped members 11a and 11b (drop-off prevention devices) are separately provided on both sides. These L-shaped members 11b, 11b are used as sealing parts 6 in the mounting grooves 5.
The holding force is increased to prevent the falling off.

Other functions and effects are the same as those in FIG. 11. Particularly, in this modification, when it is difficult to form a rib on the mounting groove 5, and in the example shown in FIGS. By attaching the L-shaped members 11a and 11b to the mounting groove 5 described above, it is effective in a case where a drop-out prevention function is added.

FIG. 14 is a cross-sectional view of a sealed rolling bearing device according to a second modification of the third embodiment of the present invention. In the second modification of the third embodiment, both sides of the mounting groove 5 are
The inclined surfaces 12a and 12b (fall prevention devices) are formed so as to become wider toward the back of the groove.
By 2b, the holding force of the sealing device 6 in the mounting groove 5 is increased, and it is reliably prevented from dropping. Other functions and effects are the same as those in the examples shown in FIGS. 11 to 13. In this embodiment, in particular, in the present embodiment, the processing of the mounting groove 5 is more difficult than the case of forming the ribs as shown in FIG. 12,1
2 can be completed, and the manufacturing cost can be reduced.

In this embodiment, the sealing member 7 has a rectangular cross section in order to enhance the adhesion to the mounting groove 5, but has a trapezoidal shape as shown in FIGS. Is also good.

FIG. 15 shows a third embodiment of the present invention.
It is sectional drawing of the sealing type rolling bearing device concerning a modification. In the third modification, a pair of recesses 13 a and 13 b are formed on both side surfaces of the mounting groove 5, and the seal member 7 is formed.
Further, a pair of ribs 14a, 14b inserted into these recesses 13a, 13b are formed. These recesses 13
With the ribs a and 13b and the ribs 14a and 14b inserted therein, a drop-off prevention device is formed, and the holding force of the sealing device 6 in the mounting groove 5 is increased to prevent the drop-off. Other operations and effects are the same as those of the first to third embodiments.

FIG. 16 shows a fourth embodiment according to the third embodiment of the present invention.
It is sectional drawing of the sealing type rolling bearing device concerning a modification.

In the fourth modification of the third embodiment, a rib 15 (drop-off prevention device) is formed only on one side of the mounting groove 5. The ribs 15 increase the holding force of the sealing device 6 in the mounting groove 5 and reliably prevent the sealing device 6 from falling off. The shape of the sealing device itself is the same as that of FIG. Other operations and effects are the same as those shown in FIGS.

FIG. 17 shows a fifth embodiment according to the third embodiment of the present invention.
It is sectional drawing of the sealing type rolling bearing device concerning a modification.

In the fifth modification of the third embodiment, the structures of the mounting groove 5 and the ribs 10a and 10b are the same as those of FIGS. 11 and 12, but the sealing member 7 is provided with a holding member. Not. Therefore, only the pair of ribs 10a and 10b has a function of holding the sealing device 6 in the mounting groove 5, and the falling off of the sealing device 6 is reliably prevented. In this case, since no holding member is required, the manufacturing cost can be reduced, and the degree of freedom in designing the shape of the seal member 7 can be increased. Other functions and effects are the same as those in FIGS. 11 to 16.

[0044]

According to the present invention, the mounting operation can be easily performed because the sealing device is elastically deformed and the sealing device is incorporated into the mounting groove formed between the joints of two adjacent inner rings. In addition, since the sealing device is held in pressure contact with the inner ring mounting groove surface by the elastic restoring force, an excellent sealing effect can be obtained.

According to the configuration of the second embodiment of the present invention, since the holding member is provided to enhance the holding force of the sealing device in the inner ring mounting groove, an excellent sealing effect is stably provided for a long period of time. can get.

According to the third embodiment of the present invention, the mounting groove between the inner races is provided with a falling-off preventing device (for example, a rib, an inclined surface) for preventing the falling off from the mounting groove for the sealing mounting. Therefore, the holding force of the sealing device in the mounting groove can be increased, and the falling off can be reliably prevented.

Further, when the sealing device is mounted in the mounting groove, the sealing device, which is generally made of an elastic material such as rubber, can be mounted while shrinking, and the falling-off preventing device (eg, rib, inclined surface) The mounting operation is not hindered.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a sealed rolling bearing device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of a sealed rolling bearing device according to a first modification of the first embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a sealed rolling bearing device according to a second modification of the first embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a sealed rolling bearing device according to a third modified example of the third embodiment of the present invention.

FIG. 5 is a cross-sectional view of a main part of a sealed rolling bearing device according to a fourth modification of the first embodiment of the present invention.

FIG. 6 is a sectional view of a main part of a sealed rolling bearing device according to a second embodiment of the present invention.

FIG. 7 is a sectional view of a main part of a sealed rolling bearing device according to a first modification of the second embodiment of the present invention.

FIG. 8 is a sectional view of a main part of a sealed rolling bearing device according to a first modification of the second embodiment of the present invention.

FIG. 9 is a cross-sectional view of a main part of a sealed rolling bearing device according to a first modification of the second embodiment of the present invention.

FIG. 10 is a cross-sectional view of a main part of a sealed rolling bearing device according to a first modification of the second embodiment of the present invention.

FIG. 11 is a sectional view of a main part of a sealed rolling bearing device according to a third embodiment of the present invention.

FIG. 12 is a diagram showing a state where the sealing device is inserted into the mounting groove in FIG. 11;

FIG. 13 is a sectional view of a main part of a first modified example of the sealed rolling bearing device according to the third embodiment of the present invention.

FIG. 14 is a sectional view of a main part of a second modification of the sealed rolling bearing device according to the third embodiment of the present invention.

FIG. 15 is a sectional view of a main part of a third modified example of the sealed rolling bearing device according to the third embodiment of the present invention.

FIG. 16 is a sectional view of a main part of a fourth modified example of the sealed rolling bearing device according to the third embodiment of the present invention.

FIG. 17 is a sectional view of a main part of a fifth modified example of the sealed rolling bearing device according to the third embodiment of the present invention.

FIG. 18 is a sectional view of a sealed rolling bearing device mounted on a work roll neck of a steel rolling device.

FIG. 19 is a partial cross-sectional explanatory view showing a conventional sealing device incorporated in a mounting groove formed in an adjacent inner ring facing portion of the sealed rolling bearing device shown in FIG. 18;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Work roll (shaft) 2a, 2b Inner ring 3a, 3b, 3c Rolling element 4a, 4b, 4c Outer ring 5 Mounting groove 6 Sealing device 7 Sealing member 8 Groove 9 Holding member 10 Rib (fall prevention device) 11 Sectional L-shaped member (Drop prevention device) 12 Inclined surface (Drop prevention device) 13 Concavity (Drop prevention device) 14 Rib (Drop prevention device) 15 Rib (Drop prevention device)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuo Akagami 1-5-150 Kugenuma Shinmei, Fujisawa-shi, Kanagawa F-term in NSK Ltd. (reference) 3J016 AA01 AA04 BA03 CA03 3J101 AA16 AA25 AA32 AA44 AA54 AA62 BA53 BA56 BA73 FA04 FA46

Claims (3)

[Claims] A sealing type rolling device comprising a plurality of rolling elements supported from a radially inner side and a mounting groove for mounting a sealing device formed between joints of a plurality of inner rings fitted on an outer peripheral surface of a shaft. A sealed rolling bearing device, characterized in that the sealing device is elastically deformed, is mounted in the mounting groove, and is pressed and held on the mounting groove forming surface by elastic restoring force. 2. The sealed rolling bearing device according to claim 1, wherein said sealing device is provided with an elastically deformable holding member in order to enhance the holding force of said sealing device in said mounting groove. 3. The sealed rolling bearing device according to claim 1, further comprising a falling-off preventing device for preventing the sealing device from falling out of the mounting groove.