JP2008075758A - Self-aligning roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-aligning roller bearing for securing consistently stable behavior of symmetrical rollers. <P>SOLUTION: The self-aligning roller bearing 21 comprises an inner ring 22, an outer ring 23, the plurality of symmetrical rollers 11 each of which has a spherical rolling face 14 along a raceway surface 25a of the inner ring 22 and a raceway surface 25b of the outer ring 23 and has a maximum diameter at the center in a roller longitudinal direction and which are arranged in double rows between the inner ring 22 and the outer ring 23, and a guide ring 24. Herein, the position in the roller longitudinal direction of a contact point 26a where each of the symmetrical rollers 11 contacts the raceway surface 25a of the inner ring 22 and the position in the roller longitudinal direction of a contact point 26b where each of the symmetrical rollers 11 contacts the raceway surface 25b of the outer ring 23 are located outside the bearing beyond the center of the symmetrical roller 11 in the roller longitudinal direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a self-aligning roller bearing, and more particularly to a self-aligning roller bearing including a symmetrical roller having a maximum diameter located at the center in the roller length direction.

  Spherical roller bearings are used in places where alignment is required in bearings used in construction machinery, steel equipment, and general industrial machinery. A configuration of a conventional double row spherical roller bearing will be briefly described.

  FIG. 5 is a cross-sectional view showing a part of a conventional double row self-aligning roller bearing. Referring to FIG. 5, a self-aligning roller bearing 101 includes an inner ring 102, an outer ring 103, a plurality of spherical rollers 104a and 104b arranged in a double row, and a cage that holds a plurality of spherical rollers 104a and 104b. 105a, 105b, and guide wheels 106 arranged between the spherical rollers 104a, 104b arranged in double rows. The spherical rollers 104 a and 104 b arranged in a double row can be appropriately rolled by the guide wheel 106.

  The raceway surface 108 of the outer ring 103 is spherical with the bearing center of the spherical roller bearing 101 as the center. The rolling surfaces 109a and 109b of the spherical rollers 104a and 104b are formed in a spherical shape so that they can roll on the spherical raceway surface. The raceway surface 107 of the inner ring 102 is spherical so as to correspond to the rolling surfaces 109a and 109b. With such a configuration, even if the outer ring 103 is inclined with respect to the bearing center, the rolling surfaces 109a and 109b and the raceway surfaces 107 and 108 can appropriately come into contact. Therefore, alignment can be ensured.

In addition, a self-aligning roller bearing having a similar configuration instead of a guide wheel and having the same configuration is disclosed in Japanese Patent Laid-Open No. 2002-147449 (Patent Document 1).
JP 2002-147449 A (FIG. 2)

The spherical roller provided in the self-aligning roller bearing includes an asymmetric roller whose maximum diameter is not located at the center in the roller length direction and a symmetric roller located at the center in the roller length direction. Asymmetrical rollers and symmetric rollers are selectively used according to the application. FIG. 6 shows an asymmetric roller, and FIG. 7 shows a symmetric roller. Referring to FIG. 6, when the position of the maximum diameter in the roller length direction is represented by a line 113, in the asymmetric roller 111, the dimension X ₁ in the roller length direction from one end face 112 a to the line 113 is It differs from the roller length dimension _{X 2} from the end face 112b to the line 113. On the other hand, referring to FIG. 7, when the position of the maximum diameter in the roller length direction is represented by a line 123, in the symmetric roller 121, the dimension X ₃ in the roller length direction from one end face 122 a to the line 123 is rollers from the other end face 122b to the line 123 is the same as the dimension _{X 4} in the length direction.

  Here, the structure of the self-aligning roller bearing provided with the asymmetrical roller 111 shown in FIG. 6 is demonstrated easily. FIG. 8 is a cross-sectional view showing a part of a self-aligning roller bearing provided with asymmetrical rollers 111. Referring to FIG. 8, the basic configuration of spherical roller bearing 114 is the same as that of spherical roller bearing 101 shown in FIG. In addition, the inner ring 116 is provided with a center collar 115 in which a part of the inner ring 116 protrudes to the outer diameter side instead of the guide wheel 106.

The asymmetrical roller 111 is arranged so that the end surface 112b on the side having a short dimension from the wire 113 is on the bearing inner side, that is, on the middle flange 115 side. The asymmetrical roller 111 contacts the inner ring 116 and the outer ring 117 at the contact points 118a and 118b. The asymmetrical rollers 111 receive loads Y ₁ and Y ₂ from the inner ring 116 and the outer ring 117, respectively. The loads Y ₁ and Y ₂ are directions perpendicular to the tangent lines 119a and 119b at the contact points 118a and 118b, respectively. In the length direction roller, the contact point 118a, the position of 118b are the bearing outer than the line 113, the direction of the load _Y 1, _{Y 2} is induced thrust load _{Y 3} which together is a bearing inside. Then, by the induced thrust load _{Y 3,} so that and the end surface 112b and the intermediate flange 115 constant contact. Further, by making the extension lines of the tangent lines 119a and 119b coincide on the bearing center axis of the self-aligning roller bearing 114, the skew of the asymmetrical roller 111 is prevented. As a result, the behavior of the asymmetric roller 111 can always be stabilized.

Next, the structure of the self-aligning roller bearing provided with the symmetrical roller 121 shown in FIG. 7 is demonstrated easily. FIG. 9 is a cross-sectional view showing a part of a self-aligning roller bearing provided with symmetrical rollers 121. Referring to FIG. 9, the basic configuration of the self-aligning roller bearing 124 is the same as that of the self-aligning roller bearing shown in FIG. The symmetrical roller 121 is disposed so that one end surface 122b is on the guide wheel 125 side. The symmetric roller 121 contacts the inner ring 126 and the outer ring 127 at the contact points 128a and 128b. Since the extended lines of the tangent lines 129a and 129b at the contact points 128a and 128b do not coincide with each other on the central axis of the self-aligning roller bearing 124, the guide rollers 125 are disposed between the left and right symmetrical rollers 121, thereby the symmetrical rollers 121. Prevents skew. Similarly to the above, the symmetric roller 121 receives loads Y ₄ and Y ₅ from the inner ring 126 and the outer ring 127, respectively. The loads Y ₄ and Y ₅ are directions perpendicular to the tangent lines 129a and 129b, respectively. In the roller length direction, the positions of the contact points 128a and 128b are theoretically on the line 123, which is the position of the maximum diameter, so that no induced thrust load in the roller length direction is generated.

  However, even in the case of the symmetric roller 121, the contact point with the inner ring and the outer ring is shifted from the center in the roller length direction due to the mounting of bearings, use conditions, manufacturing errors, etc. Induced thrust loads may occur in the direction.

  Here, when the induced thrust load generated in the roller length direction is directed to the inside of the bearing, the induced thrust load can be received by the guide wheel 125 located inside the bearing of the symmetric roller 121. Therefore, the behavior of the symmetric roller 121 can be stabilized.

  However, when the induced thrust load generated in the roller length direction is directed to the outside of the bearing, this induced thrust load cannot be received by the guide wheel 125 or other members. If it does so, there exists a possibility that the behavior of a symmetrical roller may become unstable.

  An object of the present invention is to provide a self-aligning roller bearing capable of always stabilizing the behavior of a symmetric roller.

  The self-aligning roller bearing according to the present invention is a left and right double row, an inner ring having a spherical raceway surface, an outer ring having a spherical raceway surface facing the raceway surface, a raceway surface of the inner ring, and a raceway surface of the outer ring. A plurality of symmetrical rollers arranged in a double row between the inner ring and the outer ring, an annular, a double row And a guide wheel which is disposed between the left and right symmetrical rollers disposed in the above and contacts one end surface of the symmetrical rollers. Here, the position in the roller length direction of the contact point where the symmetric roller and the raceway surface of the inner ring contact each other, and the position in the roller length direction of the contact point where the symmetric roller and the raceway surface of the outer ring contact each other are the roller length of the symmetric roller. It is outside the bearing rather than the center in the vertical direction.

  By comprising in this way, the induced thrust load of the roller length direction which generate | occur | produces in a symmetrical roller can always be made to bearing internal direction. If it does so, the induced thrust load which generate | occur | produces in a symmetrical roller can always be received by the guide wheel arrange | positioned inside the bearing of a symmetrical roller. Therefore, the behavior of the symmetric roller can always be stabilized.

  Here, the guide wheel is a separate member from the inner ring. However, the guide wheel is not limited to this, and includes an inner ring intermediate flange that is provided on the inner ring, protrudes from the raceway surface to the outer diameter side, and is disposed between the left and right symmetrical rollers. .

  Preferably, 0 <Lw <0.004 Dw, where Lw is the dimensional tolerance of the roller length of the symmetric roller and Dw is the maximum diameter of the symmetric roller. By doing so, the dimensional tolerance of the roller length of the symmetric roller can always be larger than zero. If it does so, the position of a contact point can always be outside a bearing rather than the center of a roller length direction. Further, by setting Lw <0.004Dw, it is possible to appropriately maintain the dimensional relationship between the dimensional tolerance in the roller length direction and the maximum diameter, and to prevent the induced thrust load from becoming excessive. Therefore, the behavior of the symmetric roller can be further stabilized.

  More preferably, 0 <B <0.001 Dg, where B is the dimensional tolerance of the width of the contact point where the guide wheel contacts the left and right symmetrical rollers, and Dg is the outer diameter of the guide wheel. By doing so, the dimensional tolerance of the width of the contact point at which the guide wheel contacts the left and right symmetrical rollers can always be larger than zero. If it does so, the position of a contact point can always be outside a bearing rather than the center of a roller length direction. Further, by setting B <0.001 Dg, it is possible to appropriately maintain the dimensional relationship between the dimensional tolerance of the contact point width and the maximum diameter, and to prevent the induced thrust load from becoming excessive. Therefore, the behavior of the symmetric roller can be further stabilized.

  According to the present invention, the induced thrust load in the roller length direction generated in the symmetric roller can always be directed toward the inside of the bearing. If it does so, the induced thrust load which generate | occur | produces in a symmetrical roller can always be received by the guide wheel arrange | positioned inside the bearing of a symmetrical roller. Therefore, the behavior of the symmetric roller can always be stabilized.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a view showing a symmetric roller provided in a self-aligning roller bearing according to an embodiment of the present invention. With reference to FIG. 2, the rolling surface 14 of the handling roller 11 has a spherical shape. Further, the maximum diameter is located on the center line 13 indicating the center of the symmetric roller 11 in the roller length direction. That is, the length dimension rollers from the central line 13 to the one end face 12a and L _1, and the length dimension rollers from the central line 13 to the other end face 12b and L _2, L 1 ₌ L ₂ Are in a relationship. Here, when the dimensional tolerance in the roller length direction of the symmetric roller 11 is Lw, the dimensional tolerance on the end faces 12a and 12b side is Lw / 2. In FIG. 2, the outer shape of the symmetric roller 11 that does not include a dimensional tolerance in the roller length direction is indicated by a dotted line.

  Here, if the dimension of the maximum diameter of the symmetric roller 11 is Dw, 0 <Lw <0.004Dw. By constituting in this way, the dimensional tolerance of the roller length of the symmetric roller 11 can always be larger than zero. Further, the dimensional relationship between the maximum diameter dimension Dw of the symmetric roller 11 and the dimensional tolerance Lw of the roller length can be made appropriate. Then, as will be described later, the behavior of the symmetric roller 11 can always be stabilized.

  FIG. 1 is a cross-sectional view showing a part of a self-aligning roller bearing including the symmetrical roller 11 shown in FIG. With reference to FIG. 1, the self-aligning roller bearing 21 includes an inner ring 22, an outer ring 23, a symmetric roller 11, a cage (not shown), and a guide ring 24. The self-aligning roller bearing 21 is a double-row self-aligning roller bearing, but one of the rows is omitted in the drawing. The inner ring 22 is a left and right double row and has a spherical raceway surface 25a. The outer ring 23 has a spherical raceway surface 25b that faces the raceway surface 25a. The rolling surface 14 of the symmetric roller 11 has a spherical shape along the raceway surfaces 25a and 25b. The symmetrical rollers 11 are arranged in a double row between the inner ring 22 and the outer ring 23. The symmetric roller 11 is held by a cage. The guide wheel 24 is annular. The guide wheel 24 is disposed between the symmetrical rollers 11 arranged on the left and right. One end surface 12 b of the symmetric roller 11 faces the guide wheel 24.

The symmetric roller 11 contacts the inner ring 22 at the contact point 26a. Similarly, it contacts the outer ring 23 at the contact point 26b. Here, as described above, when Lw> 0, Lw / 2 is always larger than 0, so that the position of the contact point 26a can be positioned outside the bearing relative to the center line 13. Similarly, the position of the contact point 26b can also be outside the bearing relative to the center line 13. Here, the load _{F 1} symmetry roller 11 receives from the inner ring 22 is a tangent 27a perpendicular direction of the raceway surface 25a at the contact point 26a. Moreover, the load _{F 2} symmetry roller 11 receives from the outer ring 23 is tangent 27b perpendicular direction of the raceway surface 25b at the contact point 26b. Then, these loads F _1, F ₂ is induced thrust load F ₃ which together is always the bearing inwardly. Therefore, the symmetrical roller 11 always receives an induced thrust load from the inner ring 22 and the outer ring 23 toward the bearing inner side. Due to such an induced thrust load, the end face 12 b always comes into contact with the guide wheel 24. As a result, the skew of the symmetric roller 11 can be controlled, the posture of the symmetric roller 11 can be stabilized, and the behavior of the symmetric roller 11 can always be stabilized.

  Here, if the value of the dimensional tolerance Lw is too large, the induced thrust load generated becomes excessive, and the guide wheel 24 may be worn or damaged. Therefore, in relation to the maximum diameter dimension Dw of the symmetric roller 11, Lw <0.004Dw. By doing so, it is possible to prevent the induced thrust load from becoming excessive and to prevent wear and damage of the guide wheel 24.

  In the above-described embodiment, the contact points 26a and 26b are located on the outer side of the bearing with respect to the center line 13 by defining the dimensional relationship of the symmetric rollers 11. However, the present invention is not limited to this. By defining the dimensional relationship, the contact points 26 a and 26 b may be located outside the bearing from the center line 13.

  FIG. 3 is a diagram showing a part of the guide wheels in this case. Referring to FIG. 3, the configuration of guide wheel 31 is basically the same as guide wheel 24 provided in self-aligning roller bearing 21 shown in FIG. In FIG. 3, the outer shape not including the dimensional tolerance of the guide wheel 31 is indicated by a dotted line. The guide wheel 31 has an annular shape and comes into contact with symmetrical rollers disposed on the left and right at the contact points 32a and 32b. Here, when the dimensional tolerance of the width between the contact points 32a and 32b is B, the dimensional tolerance on the contact points 32a and 32b side is B / 2.

  Here, if the outer diameter of the guide wheel 31 is Dg, 0 <B <0.001Dg. With this configuration, the dimensional tolerance of the width between the left and right contact points 32a and 32b can always be larger than 0, as will be described later. Further, the dimensional relationship between the outer diameter dimension Dg of the guide wheel 31 and the dimensional tolerance B of the width between the contact points 32a and 32b can be made appropriate. Then, wear and damage of the guide wheel 31 can be prevented.

  4 is a cross-sectional view showing a part of a self-aligning roller bearing provided with the guide wheel 31 shown in FIG. Referring to FIG. 4, the basic configuration of spherical roller bearing 35 is the same as that of spherical roller bearing 21 shown in FIG.

Here, when B> 0 as described above, since B / 2 is always larger than 0, the position of the contact point 37a where the symmetric roller 36 and the raceway surface 25a of the inner ring 22 contact each other, and the symmetric roller 36 and the outer ring. The position of the contact point 37b where the 23 raceway surfaces 25b come into contact with each other can always be outside the bearing with respect to the center line 38. Then, symmetrical rollers 36 induced thrust load _{F 6} the load _F 4, _{F 5} is fitted to receive from the inner ring 22 and outer ring 23 is always the bearing inwardly. Therefore, the symmetrical roller 36 always receives an induced thrust load from the inner ring 22 and the outer ring 23 toward the bearing inner side. As a result, the skew of the symmetric roller 36 can be controlled, the posture of the symmetric roller 36 can be stabilized, and the behavior of the symmetric roller 36 can always be stabilized.

  Here, if the value of the dimensional tolerance B is too large, the induced thrust load that is generated becomes excessive and the guide wheel 31 may be worn or damaged. Therefore, by setting B <0.001 Dg in relation to the outer diameter Dg of the guide wheel 31, it is possible to prevent the induced thrust load from becoming excessive and to prevent wear and damage of the guide wheel 31. it can.

  In the above embodiment, the contact point between the symmetric roller and the inner ring or the like is positioned on the outer side of the bearing with respect to the center line due to the dimensional tolerance of the symmetric roller and the dimensional tolerance of the guide wheel. Not limited to this, the contact point may be positioned on the outer side of the bearing with respect to the center line by defining the dimensional relationship of other members.

  In the above embodiment, the self-aligning roller bearing is provided with a cage. However, the present invention is not limited to this and is also applicable to a full-roller type self-aligning roller bearing that does not include a cage. The

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  Since the self-aligning roller bearing according to the present invention can always stabilize the behavior of the symmetric roller, it is effectively used when a long life is required.

It is sectional drawing which shows a part of self-aligning roller bearing which concerns on one Embodiment of this invention. It is a figure which shows the symmetrical roller with which the self-aligning roller bearing which concerns on one Embodiment of this invention is equipped. It is sectional drawing which shows a part of guide wheel with which the self-aligning roller bearing which concerns on other embodiment of this invention is equipped. It is sectional drawing which shows a part of self-aligning roller bearing which concerns on other embodiment of this invention. It is sectional drawing which shows a part of conventional self-aligning roller bearing. It is a figure which shows an asymmetrical roller. It is a figure which shows a symmetrical roller. It is sectional drawing which shows a part of spherical roller bearing provided with an asymmetrical roller. It is sectional drawing which shows a part of spherical roller bearing provided with a symmetrical roller.

Explanation of symbols

  11, 36 Symmetrical roller, 12a, 12b End face, 13, 38 Center line, 14 Rolling surface, 21, 35 Spherical roller bearing, 22 Inner ring, 23 Outer ring, 24, 31 Guide wheel, 25a, 25b Track surface, 26a , 26b, 32a, 32b, 37a, 37b contact point, 27a, 27b tangent, 33 outer diameter surface.

Claims (3)

An inner ring that is a double row on the left and right and has a spherical raceway surface;
An outer ring having a spherical raceway surface facing the raceway surface;
It has a spherical rolling surface along the raceway surface of the inner ring and the raceway surface of the outer ring, the maximum diameter is at the center in the roller length direction, and is arranged in a double row between the inner ring and the outer ring. A plurality of symmetrical rollers,
A self-aligning roller bearing provided with a guide ring that is annular and is arranged between the left and right symmetrical rollers arranged in a double row and is in contact with one end face of the symmetrical roller,
The position in the roller length direction of the contact point where the symmetric roller and the raceway surface of the inner ring contact each other and the position in the roller length direction of the contact point where the symmetric roller and the raceway surface of the outer ring contact each other are A self-aligning roller bearing that is located outside the center of the roller length direction. The self-aligning roller bearing according to claim 1, wherein 0 <Lw <0.004Dw, where Lw is a dimensional tolerance of the roller length of the symmetric roller and Dw is a maximum diameter of the symmetric roller. The width of a contact point at which the guide wheel contacts the left and right symmetrical rollers is defined as B, and the outer diameter of the guide wheel is defined as Dg, 0 <B <0.001 Dg. Spherical roller bearings described in 1.

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