JP2009074600A - Roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller bearing capable of effectively restraining reduction in the service life caused by abrasion powder or the like. <P>SOLUTION: This roller bearing 1 has an inner ring 2, an outer ring 3, and a plurality of rollers 4 rollingly interposed between both these rings. The plurality of rollers 4 include at least partially a cylindrical part 11 having a rolling surface 11a on an outer peripheral surface and a spherical roller 10 having a spherical surface part 12 projecting in the radial direction more than the rolling surface 11a in at least one in both ends of this cylindrical part 11. Recessed raceway surfaces 2b and 3b recessed more than raceway surfaces 2a and 3a and rollingly contacting with the spherical surface part 12, are respectively formed on an outer peripheral surface of the inner ring 2 and an inner peripheral surface of the outer ring 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a roller bearing used to support a roll for hot processing equipment such as continuous casting equipment.

  A continuous casting machine conveys a slab by arranging many segments having a plurality of rolls. The plurality of rolls constituting this segment are rotatably supported by rolling bearings disposed at both ends thereof. Rolling bearings that support this roll are usually roller bearings with a centering ring on the free side to release the thrust load (thrust load) from the roll that acts to move the inner and outer rings relative to each other in the axial direction. Is used. On the other hand, spherical roller bearings are used on the fixed side. Of these, the self-aligning roller bearings used on the fixed side have so-called differential slip due to the difference in the peripheral speed between the rollers and the inner and outer ring raceways due to the mechanism, resulting in peeling wear. There was a risk of breakage. For this reason, a cylindrical roller bearing that does not cause differential sliding and can have a high load capacity is used on the fixed side (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 63-40623

Cylindrical roller bearings are usually configured to restrict the axial movement of the cylindrical rollers by means of flanges provided on the inner and outer rings, and from rolls that act to move the inner and outer rings relative to each other in the axial direction. The thrust load acts so as to press the end face of the cylindrical roller against the collar portion.
On the other hand, in the cylindrical roller bearing having the above-described configuration, the end surface of the cylindrical roller and the collar portion are in a sliding contact state without rolling contact, and therefore an excessive thrust load from the roll is applied to the cylindrical roller bearing. When friction or the lubrication environment deteriorates, friction between the end surface of the cylindrical roller that is in sliding contact and the collar increases, and damage such as galling or abnormal wear occurs between the two. There is.
When damage such as wear occurs in the collar portion and the cylindrical roller in this way, the wear powder generated thereby intervenes on the raceway surface of the inner and outer rings and the rolling surface of the cylindrical roller, resulting in surface roughness on the raceway surface and the like. There was a risk of significantly reducing the life of the roller bearing.
This invention is made | formed in view of such a situation, and it aims at providing the roller bearing which can suppress the lifetime fall resulting from an abrasion powder etc. effectively.

  To achieve the above object, the present invention provides an inner ring having an inner ring raceway surface on an outer periphery, an outer ring having an outer ring raceway surface on an inner periphery, and both the raceway surfaces interposed between the both raceway surfaces in a freely rolling manner. In the roller bearing comprising a plurality of rollers having contact rolling surfaces, the plurality of rollers include a cylindrical portion having the rolling surface on an outer peripheral surface and at least one of both ends of the cylindrical portion. A roller with a spherical surface having a spherical portion protruding in a radial direction from the moving surface, at least a part thereof, and the inner ring outer peripheral surface and the outer ring inner peripheral surface are recessed more than the both raceway surfaces and A concave track surface with which the spherical surface portion is in rolling contact with each other is formed.

  According to the roller bearing configured as described above, a cylindrical portion having a rolling surface, and an end portion of the cylindrical portion protrudes in a radial direction from the rolling surface, and is formed on the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring. Since the roller with a spherical surface has a spherical surface that is in rolling contact with the formed concave raceway surface, the relative movement in the axial direction between the inner and outer rings is restricted by the contact between the spherical surface portion and the concave raceway surface. The load in the thrust direction acting on the inner and outer rings can be received. The spherical surface rolling on the concave raceway surface includes a little sliding contact with the concave raceway surface, but is in rolling contact with the sliding contact between the cylindrical roller end surface and the collar portion as in the conventional example. In comparison, frictional wear can be suppressed. Therefore, since wear powder generated by frictional wear can be reduced, it is possible to suppress a decrease in the life of the roller bearing caused by the wear powder.

In the above roller bearing, the plurality of rollers include the spherical roller having the spherical surface at both ends of the cylindrical portion, and a cylindrical roller formed in a cylindrical shape having an outer diameter substantially the same as the outer diameter of the cylindrical portion. These spherical rollers and cylindrical rollers may be arranged alternately between the two races along the circumferential direction.
In this case, since the spherical roller has spherical portions at both ends thereof, it can receive the load in the thrust direction more reliably. In addition, spherical rollers having spherical portions at both ends cannot be arranged in a state where the mutual rolling surfaces are close to each other. However, as in the present invention, spherical rollers and spherical portions are provided. By alternately arranging the cylindrical rollers that are not present along the circumferential direction, it is possible to arrange the rolling surfaces of the respective rollers so as to form a so-called full roller bearing. Therefore, it is possible to suppress the life reduction without reducing the allowable load load of the roller bearing.

Further, in the roller bearing, the plurality of rollers include the spherical roller having the spherical portion only at one end of the cylindrical portion, and the spherical portions are alternately arranged in the axial direction along the circumferential direction. Thus, it is preferable that they are arranged between the two race rings.
In this case, all the rollers can be constituted by the same spherical roller, and an increase in cost can be suppressed. In addition, since the spherical rollers are arranged so that the spherical surface portions are staggered along the circumferential direction, even if each spherical surface portion has a spherical surface protruding in the radial direction from the rolling surface, The rolling surfaces between the rollers can be arranged close together, and a full roller bearing can be configured. Therefore, it is possible to suppress the life reduction without reducing the allowable load load of the roller bearing.

  According to the roller bearing of the present invention, it is possible to effectively suppress a decrease in life due to wear powder and the like.

  Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in the following description, the case where this invention is applied as a roller bearing for guide rolls which comprises the segment of a continuous casting machine is illustrated and demonstrated. Fig.1 (a) is sectional drawing which shows the roller bearing which concerns on one Embodiment of this invention. The roller bearing 1 includes an inner ring 2 into which a journal portion (not shown) of the guide roll is inserted on the inner peripheral surface side, an outer ring 3 disposed on the radially outer side of the inner ring 2, an inner ring 2 and an outer ring 3. A plurality of rollers 4 interposed between the outer ring 3 and the aligning ring 5 attached to the outer peripheral side of the outer ring 3 constitute a so-called roller bearing with an aligning ring.

FIG. 1 (b) is a diagram showing an arrangement of the plurality of rollers 4 on the outer peripheral surface of the inner ring 2. 1 (a) and 1 (b), the plurality of rollers 4 are members formed using bearing steel or the like, a cylindrical portion 11 having a rolling surface 11a on the outer peripheral surface, and the cylindrical portion. A spherical roller 10 having a spherical surface portion 12 projecting in a radial direction from the rolling surface 11a at both ends of the roller 11 and having a spherical surface portion 12 formed so that its center is located on the axial center line of the cylindrical portion 11 or its extension line; And the cylindrical roller 20 that does not have the spherical surface portion 12. The spherical roller 10 and the cylindrical roller 20 are alternately arranged along the circumferential direction of the inner and outer rings 2 and 3 and are interposed between the inner and outer rings 2 and 3.
The cylindrical portion 11 of the roller with spherical surface 10 and the cylindrical roller 20 are formed in a cylindrical shape whose outer diameters are substantially the same, and the cylindrical portion 11 and the cylindrical roller 20 are an inner and outer ring 2 described later. , 3 between the inner ring raceway surface 2a and the outer ring raceway surface 3a.
Further, the spherical surface portion 12 of the roller with spherical surface 10 has an outer surface 12a formed in a spherical shape, and the diameter thereof is set such that the spherical surface portions 12 adjacent to each other with the cylindrical roller 20 in between do not contact each other. . By doing so, it is possible to prevent the spherical portions 12 adjacent to each other from coming into contact with each other and to restrict the movement of the cylindrical rollers 20 positioned therebetween in the axial direction.

The inner ring 2 is an annular member formed in a cylindrical shape using bearing steel or the like, and on its outer peripheral surface, the rolling surface 11a of the cylindrical portion 11 of the spherical roller 10 and the rolling surface 20a of the cylindrical roller 20 are provided. An inner ring raceway surface 2a is formed which contacts and rolls.
Further, a pair of concave raceway surfaces 2b that are recessed radially inward from the inner ring raceway surface 2a are formed on the outer peripheral surface of the inner ring 2 along both axial end edges of the inner ring raceway surface 2a. The cross section of the concave raceway surface 2b is set to a concave curved surface having a curvature with which the outer surface 12a of the spherical surface portion 12 of the spherical roller 10 can be brought into rolling contact. The roller with spherical surface 10 is configured to roll on the outer peripheral surface of the inner ring 2 with the cylindrical portion 11 in contact with the inner raceway surface 2a and the spherical portion 12 in contact with the concave raceway surface 2b.

The outer ring 3 is an annular member formed of a steel material, for example, bearing steel, like the inner ring 2, and the inner peripheral surface has a rolling surface 11 a of the cylindrical portion 11 of the spherical roller 10 and a cylindrical shape. An outer ring raceway surface 3a is formed in which the rolling surface 20a of the roller 20 contacts and rolls.
Further, a pair of concave raceway surfaces 3b that are recessed radially outward from the outer ring raceway surface 3a are formed on the inner peripheral surface of the outer ring 3 along both axial edges of the outer ring raceway surface 3a. Similar to the concave raceway surface 2b of the inner ring 2, the cross section of the concave raceway surface 3b is set to a concave curved surface having a curvature that allows the outer surface 12a of the spherical surface portion 12 of the spherical roller 10 to be in rolling contact. The roller with spherical surface 10 is configured to roll on the inner peripheral surface of the outer ring 3 with the cylindrical portion 11 in contact with the outer raceway surface 3a and the spherical portion 12 in contact with the concave raceway surface 3b.

With the above configuration, the roller 4 (the roller with spherical surface 10 and the cylindrical roller 20) is movably interposed between the inner and outer rings 2 and 3, and the inner and outer rings 2 and 3 of the roller bearing 1 of the present embodiment are Relative rotation is possible.
The outer peripheral surface 3 c of the outer ring 3 is formed in a convex spherical surface and is in contact with the inner peripheral surface 5 a of the aligning ring 5.

  The aligning ring 5 attached to the outer peripheral side of the outer ring 3 is fitted in a housing (not shown) for holding the roller bearing 1 provided in the segment of the continuous casting machine. The inner peripheral surface 5a of the aligning ring 5 is formed as a concave spherical surface corresponding to the outer peripheral surface 3c of the outer ring 3, and can swing relative to the outer peripheral surface 3c. Thereby, the aligning ring 5 holds the inner and outer rings 2 and 3 so as to be tiltable, and allows a slight deviation between the axis of the journal portion inserted into the inner ring 2 and the axis of the housing. Can do.

  FIG. 2 is a side view of the roller bearing 1 with the aligning ring 5 removed. As shown in the drawing, the outer ring 3 includes a first outer ring member 6 and a second outer ring member 7 that are divided into two in the radial direction, and is configured in an annular shape by combining these. A spherical roller 10 interposed between the inner and outer rings 2 and 3 has a cylindrical portion 11 that rolls in contact with the inner and outer ring raceway surfaces 2a and 3a, and both axial ends of the inner and outer ring raceway surfaces 2a and 3a. Since the spherical portions 12 that contact the pair of concave raceway surfaces 2b and 3b formed at the both ends are provided at both ends, the spherical roller 10 is restricted from moving in the axial direction with respect to the inner and outer rings 2 and 3. At the same time, the relative movement of the inner and outer rings 2 and 3 in the axial direction is also restricted. For this reason, for example, when the outer ring 3 is integrally formed in an annular shape, the rollers 4 (the spherical roller 10 and the cylindrical roller 20) cannot be disposed between the inner and outer rings 2 and 3. In this regard, in the present embodiment, as described above, the outer ring 3 is divided into two parts so that the rollers 4 can be arranged between the inner and outer rings 2 and 3 and can be assembled as the roller bearing 1.

  According to the roller bearing 1 according to the present embodiment configured as described above, the cylindrical portion 11 having a rolling surface, and the end portion of the cylindrical portion 11 projects more radially than the rolling surface 11a and the inner ring 2 The spherical portion 12 is provided with a spherical roller 10 having a spherical portion 12 that includes a little sliding contact but a rolling contact with the concave raceway surfaces 2 b and 3 b formed on the outer peripheral surface and the inner peripheral surface of the outer ring 3. Then, by the contact with the concave raceway surfaces 2b and 3b, the relative movement of the inner and outer rings 2 and 3 in the axial direction can be restricted, and the thrust load acting on the inner and outer rings 2 and 3 can be received. Further, since the spherical surface portion 12 rolling on the concave raceway surfaces 2b and 3b includes a slight sliding contact with the concave raceway surfaces 2b and 3b, but is in rolling contact, the cylindrical roller end face and the collar portion as in the conventional example described above. Friction and wear can be suppressed as compared with the sliding contact between the two. Therefore, since wear powder generated by frictional wear can be reduced, it is possible to suppress a decrease in the life of the roller bearing 1 due to the wear powder.

  Moreover, in this embodiment, since the roller 10 with a spherical surface has the spherical surface part 12 in the both ends, it can receive the load of a thrust direction more reliably. Further, the spherical rollers 10 having the spherical portions 12 at both ends cannot be arranged in a state in which the space between the rolling surfaces 11a is closed, but as in the present invention, the spherical rollers 10 and the spherical rollers By alternately arranging the cylindrical rollers 20 having no portion along the circumferential direction, it is possible to arrange the rolling surfaces of the respective rollers so as to form a so-called full roller bearing. Accordingly, it is possible to suppress the life reduction without reducing the allowable load load of the roller bearing 1.

  FIG. 3 is a view showing an arrangement of rollers on the outer peripheral surface of the inner ring 2 of the roller bearing 1 according to the second embodiment of the present invention. The main difference between this embodiment and the first embodiment is that, for all the rollers 4, a spherical roller 10 having a spherical surface portion 12 only at one end of the cylindrical portion 11 is used. Since other points are the same as those in the first embodiment, description thereof is omitted.

As described above, the spherical roller 10 of the present embodiment has the spherical surface portion 12 only at one end of the cylindrical portion 11, and the position of the spherical surface portion 12 in the axial direction is the circumference of the inner and outer rings 2 and 3. It is arranged between the inner and outer rings 2 and 3 so as to be arranged alternately along the direction and is movably interposed.
In the roller bearing 1, by arranging the spherical rollers 10 as described above, the outer surface 12a of the spherical surface portion 12 is made to be a biconcave raceway surface 2b, while the rolling surface 11a is brought into contact with the raceway surfaces 2a and 3a. 3b can be contact-rolled.

  In this case, all the rollers 4 can be constituted by spherical rollers 10 having the same shape, and an increase in cost can be suppressed. Further, since the spherical rollers 10 are arranged so that the spherical portions 12 are staggered along the circumferential direction, the spherical rollers 10 each have a spherical portion 12 projecting in the radial direction from the rolling surface 11a at one end portion. Even so, the space between the rolling surfaces 11a of the rollers can be arranged and arranged, and a full roller bearing can be configured. Accordingly, it is possible to suppress the life reduction without reducing the allowable load load of the roller bearing 1.

The present invention is not limited to the above embodiment. In each of the embodiments described above, the cross-sectional shape of the concave raceway surfaces 2b and 3b is set to a concave curved surface having a curvature that allows the outer surface 12a of the spherical surface portion 12 of the spherical roller 10 to be in rolling contact. For example, FIG. It is good also as a concave-shaped track surface dented in a V-shaped cross section. The cross-sectional shapes of the concave raceway surfaces 2b and 3b are formed so as to contact the spherical portion 12 of the spherical roller 10 at four points. At this time, the normal line of the contact surface between the biconcave raceway surfaces 2b and 3b and the spherical surface portion 12 at each contact point intersects with the axial direction of the roller bearing 1, so the spherical surface portion 12 and the biconcave raceway surface. The surfaces 2b and 3b are in rolling contact with a little sliding contact.
Thus, by making the spherical surface portion 12 and the both concave raceway surfaces 2b and 3b point contact, the rolling resistance due to the rolling contact between them can be reduced, and the rotational resistance of the roller bearing 1 as a whole can be reduced. Can be prevented from increasing.

Further, when the spherical roller 10 having the spherical portions 12 at both ends is used as in the roller bearing 1 according to the first embodiment, as shown in FIG. 4B, the inner and outer ring raceway surfaces 2a and 3a. Between the concave track surfaces 2b and 3b, an annular thin portion 8 that smoothly connects both surfaces with curved surfaces may be formed. The thinning portion 8 is formed so that the half surface on the cylindrical portion 11 side of the outer surface 12a of the spherical portion 12 does not contact the concave track surfaces 2b and 3b. Even in this case, the rolling resistance due to the rolling contact between the spherical surface portion 12 and the both concave raceway surfaces 2b and 3b can be reduced, and the rotation resistance of the roller bearing 1 as a whole can be prevented from increasing.
Moreover, although the case where this invention was applied about the roller bearing with a centering ring was illustrated in the said embodiment, this invention is applied also to the roller bearing which does not have a centering ring, as shown in FIG. be able to.

(A) is sectional drawing which shows the roller bearing which concerns on one Embodiment of this invention, (b) is the figure which showed the aspect of arrangement | positioning on the inner ring | wheel outer peripheral surface of a some roller. It is a side view of a roller bearing when the aligning ring is removed. It is the figure which showed the aspect of arrangement | positioning on the inner ring outer peripheral surface of the roller which the roller bearing which concerns on 2nd embodiment of this invention has. (A) And (b) is sectional drawing which shows the roller bearing which concerns on other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Roller bearing 2 Inner ring 2a Inner ring raceway surface 2b Concave raceway surface 3 Outer ring 3a Outer ring raceway surface 3b Concave raceway surface 4 Roller 10 Spherical roller 11 Cylindrical part 11a Rolling surface 12 Spherical part 20 Cylindrical roller

Claims (3)

An inner ring having an inner ring raceway surface on the outer periphery;
An outer ring having an outer ring raceway surface on the inner periphery;
In a roller bearing comprising: a plurality of rollers having a rolling surface that is movably interposed between the both raceway surfaces and is in contact with the both raceway surfaces;
The plurality of rollers includes a spherical roller having a cylindrical portion having the rolling surface on an outer peripheral surface, and a spherical portion protruding in a radial direction from the rolling surface at least one of both ends of the cylindrical portion. At least part of it,
2. A roller bearing according to claim 1, wherein a concave raceway surface is formed on the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring. The plurality of rollers include the spherical roller having the spherical surface at both ends of the cylindrical portion, and a cylindrical roller formed in a cylindrical shape having an outer diameter substantially the same as the outer diameter of the cylindrical portion,
2. The roller bearing according to claim 1, wherein the spherical roller and the cylindrical roller are alternately arranged between the two race rings along a circumferential direction.   The plurality of rollers include the spherical roller having the spherical portion only at one end of the cylindrical portion, and the spherical portions are arranged alternately in the axial direction along the circumferential direction. The roller bearing according to claim 1, wherein

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