JP2019070395A - Cross tapered roller bearing - Google Patents

Abstract

To provide a cross tapered roller bearing capable of shortening a time of assembling a conical roller, and also reducing labor.SOLUTION: A cross tapered roller bearing 100 is configured such that directions of adjacent conical rollers 106a, 106b are arranged so as to cross with each other, a bearing ring of an inner ring 102 or an outer ring 104 is split in an axial direction, and between the split bearing rings (inner rings 102a, 102b), an annular spacer 110 is arranged. A conical roller-side end 114 of the spacer 110 projects from the split inner rings 102a, 102b in a radial direction, and is overlapped with an end surface 116 of the conical roller 106a in the axial direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a cross tapered roller bearing.

  The cross tapered roller bearing is a bearing in which the directions of adjacent tapered rollers are arranged to cross each other. In the main cross tapered roller bearing, one of the outer ring and the inner ring is divided in the axial direction, and the other ring (in particular, the side where importance is attached to rotational accuracy) is integrated. Cross tapered roller bearings can receive all loads such as radial load, axial load, moment load and so on by themselves, and help to simplify installation equipment, for example, weight reduction, downsizing, and assembly by reducing peripheral parts It is possible to reduce man-hours and the like.

  Cross-tapered roller bearings are often used in precision machines such as machining centers and grinding machines, and more appropriate rotational precision is required for each precision machine. Therefore, the cross tapered roller bearing is preloaded on the tapered roller. In many cases, the application of preload is adjusted by tightening the divided bearing rings at the time of assembly.

  On the other hand, for example, in the cross roller bearing described in Patent Document 1, a seating ring 10 is provided as a component for applying a preload. The seating ring 10 is a U-shaped cross-sectional component made of a spring material, and applies a preload to the conical rollers 7 and 8 by the return force of elastic deformation.

Japanese Patent Application Laid-Open No. 10-196649

  Cross tapered roller bearings are required to reduce the time and effort required for assembly work. For example, when tapered rollers with two orientations are inserted into a bearing ring laid flat, the tapered rollers in the upper row will fall below the position during operation. Therefore, first, the cross tapered roller bearing is fitted and rotated before tightening the divided races. By this familiar rotation, the tapered roller also gradually turns up to the operating position while rotating. After the tapered rollers are in the operating position, the divided rollers are further tightened to apply an appropriate preload to the tapered rollers. However, since this familiar rotation requires several tens of rotations, it is also a factor that requires time and effort for the operation.

  In addition, in order to apply a more appropriate preload, a more delicate tightening adjustment of the race, which is being divided, is actually required in the precision machine, which is also necessary for the assembling operation. It is a factor that takes time and effort.

  In the technique of Patent Document 1 described above, the seating ring 10 is flexed by tightening the divided outer race 4 (outer ring), and bulges and contacts the conical rollers 7 and 8. Therefore, although it is possible to apply a pre-load to the conical rollers 7 and 8 at the time of operation, they do not help to maintain the posture of the conical rollers 7 and 8 at the start of assembly, so conformal rotation is also required. Also in Patent Document 1, there is no difference in that it is necessary to adjust the degree of tightening of the divided races in the field in order to provide an appropriate preload.

  In view of such problems, the present invention aims to provide a cross tapered roller bearing capable of shortening the time for assembling tapered rollers and reducing labor.

  In order to solve the above problems, a typical configuration of the cross tapered roller bearing according to the present invention is a cross tapered roller bearing in which the directions of adjacent tapered rollers cross each other, and one of the inner ring and the outer ring The races of the ring are axially divided and provided with an annular spacer disposed between the divided races, the tapered roller side end of the spacer radially projecting from the divided races, axial It overlaps with the end face of the tapered roller in the direction.

  Since the above-mentioned spacer protrudes from the bearing ring at the end, it can support the end face of the upper tapered roller at the time of assembly, and can prevent the tapered roller from falling. And since it is possible to hold | maintain and assemble | attach a tapered roller in a near posture at the time of driving | operation, the position of a tapered roller can be stabilized early with few fitting rotations, and the time of assembly work can be shortened. In addition, by making the spacer thick enough to be preloaded, it is not necessary to adjust the degree of tightening at the site, and it is sufficient to simply sandwich the spacer between the divided bearing rings, so the labor for assembly work is also possible. It is possible to reduce.

  The above spacer may be made of steel. If it is a steel material, the rigidity is high, and precise adjustment of thickness is also possible, so that the above-described spacer can be suitably embodied.

  The tapered roller side end of the above spacer may have a triangular cross-sectional shape. With this configuration, the area in contact with the tapered roller at the time of assembly becomes large, and therefore the tapered roller can be stably supported. In addition, since the tapered roller is separated from the spacer during operation, there is no possibility that the spacer interferes with the rotation of the tapered roller.

  According to the present invention, it is possible to provide a cross tapered roller bearing capable of shortening the time for assembling the tapered roller and reducing the labor.

It is the perspective view which showed the outline | summary of the cross tapered roller bearing concerning embodiment of this invention. It is the figure which disassembled and showed the cross tapered roller bearing. It is a figure showing the process of assembling the cross tapered roller bearing. It is an enlarged view of the end of a spacer. It is a figure which shows the performance test of the cross tapered roller bearing of a present Example.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values and the like shown in the embodiments are merely examples for facilitating the understanding of the invention, and the invention is not limited except as otherwise described. In the specification and the drawings, elements having substantially the same functions and configurations will be denoted by the same reference numerals to omit repeated descriptions, and elements not directly related to the present invention may be illustrated or described. Omit.

  FIG. 1 is a perspective view showing an outline of a cross tapered roller bearing 100 according to an embodiment of the present invention. In FIG. 1, one inner ring 102 b is shown separated. As described above, the cross tapered roller bearing 100 of the present embodiment is an inner ring split type, the inner ring 102 is divided into two in the axial direction (the inner ring 102 a and the inner ring 102 b), and the outer ring 104 is integrated.

  FIG. 2 is an exploded view of the cross tapered roller bearing 100. Cross tapered roller bearing 100 has two rows of tapered rollers 106a, 106b in different orientations. The two rows of tapered rollers 106 a and 106 b are arranged between the inner rings 102 a and 102 b and the outer ring 104 so that the directions of adjacent tapered rollers cross each other.

  A plurality of cages 108 are provided in a cylindrical shape and disposed between the tapered rollers to maintain the posture of each tapered roller and reduce friction.

  In the present embodiment, an annular spacer 110 is disposed between the divided inner rings 102a and 102b. The spacer 110 is a component which maintains the distance between the divided inner rings 102a and 102b properly, and is concentric with the bearing ring. The spacer 110 is fastened by a plurality of bolts 112 together with the divided inner rings 102a and 102b.

  The spacer 110 has a function of holding the positions of the tapered rollers 106a and 106b when the cross tapered roller bearing 100 is assembled, which can contribute to shortening of working time and reduction of labor. There is. Hereinafter, the operation and effects of the spacer 110 will be described with reference to FIG.

  FIG. 3 is a view showing a process of assembling the cross tapered roller bearing 100. As shown in FIG. As shown in FIG. 3 (a), first, the cross tapered roller bearing 100 is a row of tapered rollers 106a between the inner ring 102a and the outer ring 104 on one side where the inner ring 102a is the raceway surface. Insert Then, the spacer 110 is loaded.

  FIG.3 (b) is a mode that the row of the other tapered roller 106b was further inserted in the state of Fig.3 (a). Here, in the present embodiment, the end 114 of the tapered roller 106a, 106b side of the spacer 110 is configured to project in the radial direction from the divided inner rings 102a, 102b. Specifically, the end 114 on the outer diameter side of the spacer 110 is set to project in the radial direction more than the smaller diameter side of the divided inner rings 102a and 102b.

  FIG. 4 is an enlarged view of end 114 of spacer 110. The end 114 of the spacer 110 described above protrudes in the radial direction from the inner rings 102a and 102b, and overlaps the end surface of the tapered rollers 106a and 106b (for example, the end surface 116 of the tapered roller 106b) in the axial direction. Therefore, the spacer 110 can support the end surface 116 of the tapered roller 106 b located on the upper side, and can prevent the tapered roller 106 b from falling downward. In this state, the inner ring 102b (see FIG. 3B) on the other side is placed, and the bolt 112 is fastened. As a result, the tapered rollers 106a and 106b can be assembled closer to the operating position.

  As shown in FIG. 4, it is preferable that the tapered roller side end 114 of the spacer 110 has a triangular cross-sectional shape. With this configuration, the area in contact with the end face 116 of the tapered roller 106 b is increased, so that the tapered roller 106 b can be stably supported. Since the tapered roller 106b is separated from the spacer 110 during operation, there is no risk that the spacer 110 interferes with the rotation of the tapered roller 106b.

  FIG.3 (c) is the figure which showed the state which tightened the volt | bolt 112 of FIG.3 (b). Before the cross tapered roller bearing 100 closes the inner rings 102a and 102b, the close rotation is performed. As a result, the tapered roller 106b separates from the spacer 110 as it rotates, and rises to the operating position. At this time, since the tapered roller 106b is supported by the spacer 110 in a state close to the position at the time of operation, the position of the tapered roller can be stabilized early by the conformable rotation smaller than before. Then, after the tapered rollers 106b are in the operating position, the inner rings 102a and 102b are further tightened to apply an appropriate preload to the tapered rollers 106a and 106b.

  The spacer 110 also serves to adjust the gap between the divided inner rings 102a and 102b, a so-called preload gap. Conventionally, the preload clearance has been managed by adjusting the degree of tightening of the inner rings 102a and 102b at the site. However, in the present embodiment, it is possible to apply an appropriate preload to the tapered rollers 106a and 106b simply by tightening the inner rings 102a and 102b by setting the spacer 110 to a thickness adjusted to the preload clearance in advance. There is. With this configuration, it is not necessary to adjust the degree of tightening of the inner rings 102a and 102b at the site, and the labor of assembly work is also reduced.

  The spacer 110 is preferably made of a steel material. If it is a steel material, the rigidity is high, and precise adjustment of thickness is also possible, so that it is possible to more efficiently manage the preload clearance by the spacer 110.

  FIG. 5 is a diagram showing a performance test of the cross tapered roller bearing 100 of the present embodiment. FIG. 5A is a diagram simulating the performance test. The test was performed by supporting the inner ring 102 at three points by the stabilizer 120, rotating the outer ring 104, and measuring the axial runout of the outer ring 104 with an electric micrometer. The dimensions of the bearing used were an outer diameter of 609.6 mm, an inner diameter of 457.2 mm, and a width of 63.5 mm.

  FIG. 5 (b) is a graph showing the test results. The test was conducted on an example including the spacer 110 (see FIG. 2) described above and a comparative example not including the spacer 110. The horizontal axis of the graph is the number of revolutions of the outer ring (times), and the vertical axis is the axial runout (μm) of the outer ring. From this graph, it is necessary to rotate the outer ring 30 times or more before the outer ring axial runout settles in the comparative example, but in the embodiment, the outer ring axial runout is the same as when the comparative example is already rotated 30 times from the initial state. It turns out that it is settled to a degree. In addition, it can be seen that, at the time of 30 revolutions, the outer ring axial runout is reduced to less than half in the example than in the comparative example.

  From the above, in the present embodiment provided with the spacer 110, the tapered roller 106b (see FIG. 3 (b) etc.) can be held with a posture close to that at the time of operation and assembled. It was found that the position of 106b stabilized early. In addition, high rotational accuracy can be exhibited, and it has been confirmed that the time for assembling work and the quality improvement are improved.

  Although the cross tapered bearing 100 described in the above embodiment is an inner ring split type, the technical idea of the present invention can also be implemented as an outer ring split cross tapered bearing. In that case, the end on the inner diameter side of the annular spacer protrudes from the divided outer ring toward the tapered roller. This configuration also supports the end surface of the tapered roller located on the upper side, and enables the tapered roller to be assembled at a position close to the time of operation.

  Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the appended claims, and of course these also fall within the technical scope of the present invention. It is understood.

  The present invention can be utilized for cross tapered roller bearings.

100: Cross tapered roller bearing, 102: inner ring, 102a: one inner ring, 102b: another inner ring, 104: outer ring, 106a: tapered roller in one row, 106b: tapered roller in the other row, 108: cage, DESCRIPTION OF SYMBOLS 110 ... Spacer, 112 ... Bolt, 114 ... End of spacer, 116 ... End surface of tapered roller, 120 ... Stabilizer

Claims (3)

A cross tapered roller bearing in which the directions of adjacent tapered rollers cross each other,
One of the inner or outer ring races is divided in the axial direction,
An annular spacer disposed between the divided races,
A cross tapered roller bearing, wherein the tapered roller side end of the spacer protrudes in the radial direction from the divided bearing ring and overlaps the end surface of the tapered roller in the axial direction.   The cross tapered roller bearing according to claim 1, wherein the spacer is made of steel.   The cross tapered roller bearing according to claim 1 or 2, wherein an end on a tapered roller side of the spacer is pointed in a triangular shape in cross section.

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