JP2000000606A - Structure of seal for rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a seal for a rolling bearing with which the number of components can be reduced and also an assembly process is simplified at the time of forming a labyrinth seal. SOLUTION: A labyrinth seal 50 of a conical roller bearing 10 is formed by arranging a collar part 54 of a 1st annual member 51 provided in an inner ring part 20 and a collar part 59 of a 2nd annual member 52 provided in an outer ring 30 alternately separately in a noncontact state. On the 2nd annular member 52, a broken part 57A is provided in a specified position and also the collar part 59 is formed on the inside peripheral surface. With this 2nd annular member 52, the initial diameter is elastically maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for a rolling bearing, and more particularly to a sealing structure for a rolling bearing used for a roll neck of a rolling mill.

[0002]

2. Description of the Related Art For example, a four-row tapered roller bearing used for a roll neck of a rolling mill rotates at a high speed while receiving a high load. Therefore, a contact type oil seal is used as a seal structure for preventing foreign matter from entering the inside of the bearing. When, the friction and the lip of the oil seal are liable to cause abrasion and heat generation. To solve this problem, a sealed multi-row roller bearing shown in FIG.
A labyrinth seal 71 is adopted as a seal structure 70 for preventing foreign matter from entering the inside of the bearing (see Japanese Patent Publication No. 3-66963: conventional example).

A sealed multi-row roller bearing 70 has a plurality of tapered rollers 74 disposed between an inner ring 72 and an outer ring 73, and inner ring members 75, 76, 77 provided at the end of the inner ring 72, and an outer ring.
Outer annular bodies 78, 79 are provided at the ends of 72. The inner annular bodies 75, 76, 77 and the outer annular bodies 78, 79 are laminated so that the flanges 80 are alternately spaced apart from each other along the axial direction, and are integrated by fixing bolts 81, 82, respectively. Form a labyrinth seal 71. According to such a sealed type multi-row roller bearing 70, since the non-contact type labyrinth seal 71 is employed, good sealing properties can be obtained, and an effect that abrasion and heat generation hardly occur can be obtained.

[0004]

By the way, in the conventional example described above, in order to form the labyrinth seal 71, the inner annular bodies 75, 76, 77 and the outer annular bodies 78, 79 are stacked and arranged, and the fixing bolts are respectively provided. Since it is necessary to integrate the components 81 and 82, there are problems that the number of components increases and the assembly process becomes complicated. The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a sealing structure for a rolling bearing that can reduce the number of components and simplify an assembly process when forming a labyrinth seal. It is in.

[0005]

In order to achieve the above-mentioned object, the present invention comprises a plurality of rolling members disposed between a rotating shaft and a housing, wherein one of the rotating shaft and the housing is provided. A rolling bearing provided with a labyrinth seal in which a flange provided along the circumferential direction on the other of the rotating shaft and the housing is inserted in a non-contact state with respect to a groove provided along the circumferential direction in. A seal structure, comprising an annular member supported by one of the rotating shaft and the housing,
A break portion is provided at a predetermined position of the annular member, and one of the groove portion and the flange is formed on a peripheral surface thereof, and the annular member can elastically maintain an initial diameter. And

Here, as the labyrinth seal, a flange may be inserted and arranged in a non-contact state inside the groove so as to form a substantially crank-shaped passage in the axial direction of the rotating shaft. The present invention is not limited to a form in which a plurality of flanges protrude from the outer peripheral surface and the inner peripheral surface of the housing. That is, in addition to the structure directly formed on the rotating shaft and the housing, a structure provided on the rotating shaft or the housing via the inner ring and the outer ring may be adopted as the groove and the flange.

On the other hand, as the annular member, a metal band or a hard resin band having an appropriate spring action may be formed into a substantially C-shape, and, for example, a specific portion may be easily deformed.
A structure in which the wall thickness is partially set to be small or a structure in which a pair of semicircular members are connected via a spring steel plate can be adopted. The entire annular member may be covered with an appropriate soft resin, may be directly fitted to a rotating shaft or a housing, or may be fixed via an inner ring or an outer ring. . When the annular member is fixed to the housing directly or via an outer ring, for example, the annular member may be covered and fixed by a pair of fixing members formed in a semicircular arc shape.

Further, the breakable portion may have a linear broken surface along the radial direction or the tangential direction of the annular member, or a step joint in which the ends of the annular member can engage with each other. A structure such as fitting may be employed.

[0009] In the sealing structure of a rolling bearing thus configured, for example, a flange is formed on the inner peripheral surface of the annular member, and the annular member is substantially C-shaped so that the initial diameter can be elastically maintained. Therefore, when a groove is formed on the rotating shaft, the annular member is covered with the groove in a state where the diameter is expanded, and then, if the annular member is returned to the initial diameter, the flange can be inserted and arranged in a non-contact state in the groove. Become. Then, the annular member may be press-fitted directly into the flange or via an outer ring or the like.

On the other hand, in the sealing structure of a rolling bearing configured as described above, for example, when the flange is formed on the outer peripheral surface of the annular member and the groove is formed in the housing, the annular member is formed into a substantially spiral shape. If the annular member is returned to its initial diameter after being placed in the housing with the diameter reduced, the flange can be inserted and placed in the groove in a non-contact state. Then, the rotating shaft only has to pass through the annular member that has returned to the initial diameter. Therefore, in such a sealing structure of a rolling bearing, in forming a labyrinth seal, the number of components can be reduced and the assembling process can be simplified as compared with the related art.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, a four-row tapered roller bearing 10 according to an embodiment of the present invention is used for a roll neck of a rolling mill that rotates at high speed under a high load, and includes an inner ring portion 20 and an outer ring portion 30. Many tapered rollers 40 are arranged in four rows between them.

The inner ring portion 20 has a pair of double-row inner rings 22, 22 coaxially arranged with an intermediate seal 21 interposed therebetween. Double row inner ring
22 has a pair of inner raceways 23, 23 formed along the outer peripheral surface, and a small diameter portion 24 is provided at an axially open end of the outer peripheral surface. The outer race portion 30 includes a double-row outer race 31 disposed so as to straddle the double-row inner races 22, 22, and a single-row outer race 3 disposed adjacent to both ends of the double-row outer race 31 via outer race spacers 32, 32.
3 and 33 are included. A pair of outer raceways 34, 34 is formed on the inner peripheral surface of the double row outer race 31, and an outer raceway 35 is formed on the inner peripheral surface of the single row outer race 33. The axial length of the outer race 30 is set smaller than the axial length of the inner race 20.

The tapered rollers 40 are oriented such that the large diameter portion or the small diameter portion is opposed to the adjacent row of tapered rollers 40, and are evenly distributed in the circumferential direction by a retainer 41 manufactured by punching a steel plate. Is held in. The four-row tapered roller bearing 10 is provided with labyrinth seals 50 at both ends in the axial direction in order to prevent foreign matter from entering the inside of the bearing.

As shown also in FIGS. 2 and 3, the labyrinth seal 50 is provided on the first row of small diameter portions 24 of the double row inner ring 22.
An annular member 51 and a second annular member 52 positioned on the end face of the single-row outer ring 33 via the seal holder 60 are included. The first annular member 51 has an annular portion 53 that can be fitted to the small diameter portion 24, and three flanges 54 provided on the outer peripheral surface of the annular portion 53. The flange 54 has a substantially rectangular cross section, and is arranged so that the distance between the end faces becomes uniform. In addition, the first annular member 51 has three flanges on the outer peripheral surface of the annular portion 53.
Since the projection 54 is provided, in other words, a pair of grooves is formed on the outer peripheral surface of the annular portion 53.

As shown in FIGS. 4 and 5, the second annular member 52 includes a pair of semicircular members 55, 55, a connecting member 56 for connecting the semicircular members 55, 55, and a semicircular member 55, 55. 55 and connecting members
And a covering portion 57 for covering the entirety of the covering 56. Semicircular member 55
Are formed by bending a metal strip having a substantially L-shaped cross section in the thickness direction, and the respective inner peripheral surfaces are arranged to face each other. The connecting member 56 is a thin metal strip having a spring action, extends along the inner peripheral surfaces of the semicircular members 55, 55, and is bridged between one ends (lower ends in FIG. 4) of the semicircular members 55, 55. Delivered and secured by rivets 58.

The covering portion 57 is made of a suitable hard resin having oil resistance or the like, covers the semicircular members 55, 55 so that the outer peripheral surfaces thereof are partially exposed, and has a pair of flange portions on the inner peripheral surface. 59 are provided. The flange 59 has a substantially rectangular cross section, and is arranged such that the distance between the end faces thereof corresponds to the distance between the end faces of the flange 54 described above. The covering portion 57 is provided with a break portion 57A at a predetermined position so that the other end portions (upper end portions in FIG. 4) of the semicircular members 55, 55 can be separated from each other. Break
57A is linearly provided along the radial direction of the second annular member 52.

The initial diameter of the second annular member 52 is such that the broken portion 57A of the covering portion 57 is closed in advance. Therefore, the second annular member 52 can be expanded in diameter by causing the one end portions of the semicircular members 55 to move away from each other while deforming the predetermined position of the connecting member 56, and can return to the initial diameter. In other words, an elastic force that reduces the diameter is generated. Since the second annular member 52 has a pair of flanges 59 protruding from the inner peripheral surface of the covering portion 57, in other words, a groove is formed on the inner peripheral surface of the covering portion 57. .

Returning to FIG. 3, the seal holder 60 has a pair of ring members 61 and 62. The ring members 61 and 62
It has an inner diameter dimension that can be engaged with the outer peripheral surface of the second annular member 52,
With a shim 63 having a predetermined thickness interposed between both end surfaces, the shim 63 is fixed to each other by fixing bolts 64, 64 (FIG. 6).
reference). The fixing bolts 64 are guided from the outer peripheral surface of the ring member 61 to a through hole 65 formed in parallel with the tangential direction, and screwed to the end surface of the ring member 62. Such a seal holder 60 includes a stepped portion 33 formed on the end face of the single row outer ring 33.
A is formed with a convex edge 66 that can be spigot-coupled, and the inner diameter can be arbitrarily selected by selectively using a plurality of types of shims 63 having different thickness dimensions. The tightening force, in other words the fixing force, can be adjusted. The seal holder 60 has an O-ring 68 fitted in a concave portion 67 provided along the outer peripheral surface.

Next, the procedure for assembling the labyrinth seal 50 according to the present invention will be described. As shown in FIG. 3, the first annular member 51 is fitted in the small-diameter portion 24 of the double-row inner ring 22 in advance, and the diameter of the second annular member 52 is increased (see the chain line in the figure).
The outer peripheral surface of the annular member 51 is covered. Then, the first annular member 51
After the flange 54 and the flange 59 of the second annular member 52 are positioned so as to be alternately separated in a non-contact state along the axial direction, the second annular member 52 is returned to the initial diameter. Next, ring members 61 and 62 are put on the outer peripheral surface of the second annular member 52, and a shim 63 having a predetermined thickness is provided between the end surfaces of the ring members 61 and 62.
63, and ring members 61,
Fix 62 to each other.

According to the above-described embodiment, the flange 54,
The labyrinth seal 50 is provided by arranging the first annular member 51 and the second annular member 52 in such a manner that the first annular member 51 and the second annular member 52 are alternately spaced apart in a non-contact state along the axial direction. And the number of components can be reduced. Further, according to this embodiment, since the second annular member 52 has a substantially C shape capable of elastically maintaining the initial diameter, the second annular member 52 is placed on the first annular member 51 in a state where the diameter of the annular member 52 is expanded. The labyrinth seal 50 can be formed by an extremely simple operation of returning the diameter to the initial diameter after that, and the assembling process can be drastically simplified as compared with the related art.

Further, in this embodiment, the second row is formed via the seal holder 60 which is spigot-coupled to the end face of the single row outer ring 33.
Since the annular member 52 is positioned, even when the tapered roller bearing 10 rotates at a high speed under a high load, there is little possibility that the second annular member 52 will be deformed such as expanding or contracting.
Wear and heat generation due to the contact of the flanges 54 and 59 with each other are unlikely to occur.

It should be noted that the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made.
For example, in the above-described embodiment, the first annular member supported by the inner ring portion fitted to the rotating shaft and the second annular member supported by the outer ring portion fitted to the housing are illustrated. In the present invention, the annular member may be provided on one of the rotating shaft and the housing, and need not be provided on both. Further, in the above-described embodiment, the diameter of the annular member provided on the housing can be increased in a substantially C shape. However, the diameter of the annular member provided on the rotating shaft may be reduced in a substantially spiral shape. . In addition, the materials, shapes, dimensions, forms, and the like of the rolling members, grooves, flanges, labyrinth seals, annular members, break portions, and the like exemplified in the above-described embodiment.
The number, the location, and the like are not limited as long as the present invention can be achieved.

[0023]

As described above, according to the present invention, when the flange is formed on the inner peripheral surface of the annular member and the groove is formed on the rotating shaft, the diameter of the annular member is increased. If the flange is inserted into the groove in a non-contact state by restoring the annular member to the initial diameter and then returning to the initial diameter, the number of component parts can be reduced compared to the conventional one when forming the labyrinth seal because the flange can be inserted and arranged in a non-contact state And the assembly process can be simplified.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment according to the present invention.

FIG. 2 is an enlarged sectional view of a main part showing a labyrinth seal.

FIG. 3 is a schematic exploded perspective view showing a labyrinth seal.

FIG. 4 is a front view showing a second annular member partially broken away.

FIG. 5 is a sectional view of a second annular member.

FIG. 6 is a partially enlarged sectional view showing the structure of a seal ring.

FIG. 7 is a sectional view showing a conventional labyrinth seal.

[Explanation of symbols]

 10 Tapered roller bearing (rolling bearing) 40 Rolling member 50 Labyrinth seal 51 First annular member (annular member) 52 Second annular member (annular member) 57A Breaking part 54, 59 Flange

Claims (1)

[Claims] 1. A rotating member having a plurality of rolling members disposed between a rotating shaft and a housing, wherein the rotating shaft is provided in a groove provided along a circumferential direction in one of the rotating shaft and the housing. And a seal structure of a rolling bearing provided with a labyrinth seal in which a flange provided along a circumferential direction on the other of the housings is inserted and arranged in a non-contact state, wherein one of the rotating shaft and the housing is provided. The annular member has a break portion provided at a predetermined position of the annular member, and one of the groove and the flange is formed on a peripheral surface thereof, and the annular member has an initial diameter. A sealing structure for a rolling bearing characterized by being elastically maintainable.