JPH0571807B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a double-row self-aligning roller bearing in which the side surfaces of the pillars of the cage are in surface contact with the spherical rollers, and the contact surface pressure between the cage and the spherical rollers is low.

As shown in FIGS. 1 to 3, a conventional double-row self-aligning roller bearing has a pair of metal cages 3 disposed between an outer ring 1 and an inner ring 2, and this cage 3 The inner annular portion 4 and the outer annular portion 5 of the bearing form a pillar 6.
They are connected as one body. A spherical roller 12 is disposed in a pocket 11 of the cage 3, and a side surface 13 of a column forming the pocket 11 is a plane perpendicular to a plane 15 including the axis of the bearing and the axis 14 of the spherical roller. A concave curved surface 18 having an arc of curvature in accordance with the rolling surface 17 of the spherical roller in the axial and radial directions is provided inside the bearing from the plane 16 that includes the axis 14 of the spherical roller. The side surface 13 of the pillar is a plane that is perpendicular to a plane 15 that includes the axial center of the bearing and the axial center 14 of the spherical rollers, and is located on the outside of the bearing from a plane 16 that includes the axial center 14 of the spherical rollers. It has a cylindrical surface 19.

Therefore, since the cylindrical surface 19 makes surface contact with the spherical roller 12, skew is likely to occur in the spherical roller 12, and the contact area between the side surface 13 of the column and the spherical roller 12 is small, so that the side surface 13 of the column and Spherical roller 1
Since the contact surface pressure with column 2 is high, there is a lot of wear on column 6. Furthermore, since the distance A between the outer circumferential surface 21 of the column and the outer circumferential surface 21 of the adjacent column is larger than the diameter of the corresponding portion of the spherical roller 12, the width dimension in the circumferential direction of the outer circumferential surface 21 of the column is short, and the column 6 The rigidity is weak. In addition, pocket 1
Since the spherical rollers 12 disposed in the bearing 1 fall out of the pocket 11 through the cylindrical surface 19 during bearing assembly, it is difficult to assemble the bearing, and it is also difficult to automate the assembly of the bearing.

Further, U.S. Patent No. 4,345,800 describes that a synthetic resin cage for a double-row self-aligning roller bearing is manufactured by injection molding. The annular part is connected by a plurality of pillars and is integrated. The radially outer mold located in the pocket between the two adjacent pillars and the radially inner mold adjacent to the radially outer mold are removed in opposite directions in the axial direction to form the pocket. It is molded. Therefore, the radially outer end of the connection between the outer annular portion of the bearing and the side surface of the column is located radially inward than the radially inner end of the connection between the inner annular portion of the bearing and the side surface of the column. To position.

Therefore, due to manufacturing problems using molds, it is not possible to increase the radial width of both the annular part on the outer side of the bearing and the annular part on the inner side of the bearing. The columns connected to the radial width were limited. Therefore, the rigidity of the column is low, and the contact area between the side surface of the column and the spherical rollers is small, causing problems such as skew of the spherical rollers and wear of the column.

SUMMARY OF THE INVENTION An object of the present invention is to provide a double-row self-aligning roller bearing in which the spherical rollers are less likely to skew, the retainer has less wear, the pillars have strong rigidity, and the bearing is easy to assemble.

Next, embodiments of the present invention will be described based on the drawings. In FIG. 4, an outer ring 31 has a spherical outer ring raceway 32, and an inner ring 33 disposed inside the outer ring 31 has two rows of inner ring races 34. A pair of cages 41 made of synthetic resin are disposed between the outer ring 31 and the inner ring 33, and as shown in FIG. are integrally connected by a plurality of pillars 44. A spherical roller 47 is disposed in a pocket 45 between the two adjacent pillars 44, and the pocket 45
The side surface 51 of the column forming the column has a plane 53 on both sides in the axial direction with respect to the axial center of the side surface 51 of the column, which includes the axis of the bearing and the axis 52 of the spherical roller, as shown in FIG. A circular arc with a curvature that conforms to the rolling surface 55 of the spherical roller is formed in the axial and radial directions on the inside and outside of the bearing from a plane 54 that is perpendicular to the plane and includes the axis 52 of the spherical roller. They have concave curved surfaces 57 and 58, respectively. That is, the concave curved surfaces 57 and 58 have a circular arc cross section taken by the plane 54 that includes the axis 52 of the spherical roller, and the concave curved surfaces 5
7 and 58 have circular arc cross sections along planes perpendicular to the axis 52 of the spherical rollers. Since the side surface 51 of the column and the spherical rollers 47 are in surface contact, the contact area between the side surface 51 of the column and the spherical rollers 47 is large, and the contact surface pressure between the side surface 51 of the column and the spherical rollers 47 is low, which reduces the wear of the column 44. Less is. In the retainer 41, the distance B between the outer circumferential surface 61 of a column and the outer circumferential surface 61 of an adjacent column is spherical roller 47.
and a portion where the distance C between the inner peripheral surface 62 of the column and the inner circumferential surface 62 of the adjacent column is shorter than the diameter of the corresponding portion of the spherical roller 47. Therefore, the rigidity of the column 44 is strong because both the width dimension in the circumferential direction of the outer peripheral surface 61 of the column and the width dimension in the circumferential direction of the inner circumferential surface 62 of the column are long. Furthermore, since the spherical rollers 47 are prevented from falling out of the pocket 45, assembly of the bearing and automation of the assembly of the bearing are facilitated. The radially outer end 94 of the connection point between the annular portion 43 on the outside of the bearing and the side surface 51 of the column is radially outward from the radially outer end 95 of the connection point between the annular portion 42 on the inside of the bearing and the side surface 51 of the column. An annular portion 42 located inwardly and inside the bearing
and the radially inner end 9 of the connection point with the side surface 51 of the column.
6 is located radially outward. Further, the radially inner end 97 of the connection point between the annular portion 43 on the outside of the bearing and the side surface 51 of the column is radially inner than the radially inner end 96 of the connection point between the annular portion 42 on the inside of the bearing and the side surface 51 of the column. Located inward. Therefore, since at least one of the annular part 43 on the outside of the bearing and the annular part 42 on the inside of the bearing has a long width in the radial direction, the pillar 44 connecting the annular part 43 on the outside of the bearing and the annular part 42 on the inside of the bearing has a radius. The width dimension in the direction is long. Therefore, the rigidity of the column 44 is strong, and since there is a large contact area between the side surface 51 of the column and the spherical surface 47, the spherical roller 47 is hardly skewed, and the column 44 is less worn.

Furthermore, since at least one of the annular portion 43 on the outside of the bearing and the annular portion 42 on the inside of the bearing has a long width in the radial direction, at least one of the annular portion 43 on the outside of the bearing and the annular portion 42 on the inside of the bearing has an end surface of the spherical roller 47. Since there is a large contact area with the spherical roller 47, it is difficult to skew in this respect as well. As shown in FIG. 7, a radial groove 71 is provided in the axial center of the side surface 51 of the column.
A lubricant such as grease is held within the groove 71 . Since the lubricant in the groove 71 flows into the pocket 45, the lubrication performance of the bearing is improved. Furthermore, even if the radius of curvature of the side surface 51 of the column becomes larger than the radius of curvature of the rolling surface 55 of the spherical roller due to the machining accuracy and deformation of the cage 41, the spherical roller 47 may be disposed at two locations in the axial direction of the side surface 51 of the column. Since the pillars are in contact with each other, the side surfaces 51 of the pillars do not wear abnormally. The bearing inner side surface 73 of the inner peripheral part of the bearing outer annular part is a plane perpendicular to the axis, and the clearance 76 between the inner peripheral part 75 of the bearing outer annular part and the spherical roller 47 is
is the outer peripheral part 78 of the annular part on the outside of the bearing and the spherical roller 47
The gap is larger than the gap 79 between the two. Therefore, the inner peripheral part 75 of the annular part on the outer side of the bearing is the retainer 41.
Even if the inner peripheral part 75 of the annular part on the outer side of the bearing is bent to the inside of the bearing during injection molding, the spherical rollers 4
The end face of 7 is not restrained. A lubricant such as grease is held in a gap 76 between the inner circumference 75 of the annular portion on the outside of the bearing and the spherical rollers 47, and this gap 7
Since the lubricant in 6 flows into the pocket 45, the oil film is prevented from running out due to the boundary edge between the bearing outer end surface of the spherical roller 47 and the rolling surface 55 of the spherical roller. The inner peripheral surface of the annular portion 48 on the outer side of the bearing serves as a cage guide surface 81, and this cage guide surface 81 is guided by the cage guide surface of the inner ring 33. The retainer 41 is manufactured by injection molding of synthetic resin, and is manufactured by punching out a spherical roller-shaped mold 82 located inside the pocket in a radial direction as shown in FIG. In this case, as shown in FIG. 6, the distance B between the outer circumferential surface of the column and the outer circumferential surface of the adjacent column is shorter than the diameter of the corresponding portion of the spherical roller 47, so the boundary between the outer circumferential surface of the column and the side surface of the column is The intervening portion 83 is somewhat elastically deformed. When the mold 82 is pulled outward in the radial direction, the distance C between the inner circumferential surface of a column and the inner circumferential surface of an adjacent column can be made smaller than the distance B between the outer circumferential surface of a column and the outer circumferential surface of an adjacent column. Incidentally, when the spherical roller 47 is inserted into the pocket 45, the interface portion 83 between the outer peripheral surface of the column and the side surface of the column is somewhat elastically deformed. A floating guide ring 86 is disposed between the two rows of inner raceway 34,
This floating guide ring 86 is fitted into the inner ring 33.
The floating guide ring 86 is guided by the inner ring 33, and the floating guide ring 86 guides the end surface of the spherical roller 47 inside the bearing and the cage 41.

FIG. 9 is an explanatory diagram when the mold in the pocket is removed during injection molding of another cage used in the present invention, in which a synthetic resin cage 41 surrounds a spherical roller-shaped mold 82. Molded. A stepped concave guide portion 87 is provided between the outer circumferential surface 61 of the column and the side surface 51 of the column, and a U-shaped presser foot 89 is disposed on this guide portion 87. With the guide portion 87 held down by the presser foot 89, the mold 82 is pulled out from the inside of the pocket in the radial direction outward. In this case, the interface part 91 between the guide part and the side surface of the column will be somewhat elastically deformed, but since the guide part 87 is held down by the presser foot 89, the interface part 91 between the guide part and the side surface of the column will sag. Less is. Further, the guide portion 87 guides the spherical roller 47 when the spherical roller 47 is inserted into the pocket 45, and the spherical roller 47 is smoothly inserted into the pocket 45.

FIG. 10 shows another embodiment having sealing performance, in which the outer circumferential surface 92 of the annular portion on the outside of the bearing and the sealing surface 93 provided on the outer ring 31 constitute a sealing portion that may be in contact or not in contact. In addition, the guide surface 81 of the cage and the inner ring 3
Since the retainer guide surface 3 constitutes a sealed part, the lubricant inside the bearing is sealed, and the bearing has a sealing performance that does not have a long bearing width, does not have a large number of parts, and has a low cost increase. In addition, it is a standard type, internationally compatible sealed spherical roller bearing that does not change the outer diameter, inner diameter, or width of the bearing.

FIG. 11 shows another embodiment in which the cage is guided by the outer ring. It is guided by the retainer guide surface 31. Further, a floating guide ring 86 is disposed between the two rows of spherical rollers 47, and this floating guide ring 86 is fitted into the outer ring 31. The floating guide ring 86 is guided by the outer ring 31, and this floating guide ring 86 guides the end surface of the spherical roller 47 inside the bearing and the cage 41.

FIG. 12 shows another embodiment in which the cage is guided by the outer ring. It is guided by the retainer guide surface 31. And the floating guide ring is omitted.

FIG. 13 shows another embodiment in which the annular portions on the outer side of the bearing on both sides in the axial direction are integrated and constituted of one member. 43 and pillars 44, respectively, and are integrated into one body. Therefore, one retainer 41 is disposed between the outer ring 31 and the inner ring 33.

FIG. 14 shows another embodiment in which the annular portions on the outer side of the bearing on both sides in the axial direction are integrated into one member, and a floating guide ring 86 disposed between two rows of spherical rollers 47 is shown in FIG. is fitted into the outer ring 31. The floating guide ring 86 is guided by the outer ring 31, and this floating guide ring 86 guides the end surface of the spherical roller 47 inside the bearing and the cage 41.

FIG. 15 shows another embodiment in which the annular portions on the outer side of the bearing on both sides in the axial direction are integrated and constituted of one member, but the annular portion 42 on the inner side of the bearing is
3 is fitted. Therefore, the inner ring 33 is the retainer 4
1, and the floating guide ring is omitted.

Note that the radial clearance L between the cage 41 and the inner ring 33 and the radial clearance M between the cage 41 and the outer ring 31 are both determined by the distance between the side surface 51 of the column and the spherical rollers 47 shown in FIG. When the radial clearance N between the cage 41 and the bearing ring 31 is larger than
The retainer 41 is guided by the spherical rollers 47 without contacting the bearing ring 3 through thermal contraction or thermal expansion.
1 and 33 is prevented.

Further, in the illustrated embodiment, a groove 7 is formed on the side surface 51 of the column.
1 was provided, but the side surface 5 of the pillar was not provided with the groove 71.
1 may be formed entirely as concave curved surfaces 57, 58, or may be partially formed as concave curved surfaces 57, 58.

According to the double-row self-aligning roller bearing of the present invention, the retainer 41 is made of synthetic resin, and the side faces 51 of the pillars forming the pockets 45 are located on both sides in the axial direction with respect to the axial center of the side faces 51 of the pillars. is a plane perpendicular to a plane 53 that includes the axis of the bearing and the axis 52 of the spherical roller, and is located inside the bearing and outside the bearing from the plane 54 that includes the axis 52 of the spherical roller. Since the spherical rollers 47 have concave curved surfaces 57 and 58 having arcs of curvature in the axial and radial directions, respectively, in conformity with the rolling surface 55, the spherical rollers 47 are difficult to skew. Further, the side surface 51 of the column is in surface contact with the spherical roller 47, and the contact area between the side surface 51 of the column and the spherical roller 47 is large, and the contact surface pressure is small, so that the wear of the column 44 is small. In addition, the cage 41 has a portion where the distance B between the outer circumferential surface 61 of the column and the outer circumferential surface 61 of the adjacent column is shorter than the diameter of the corresponding portion of the spherical roller 47, and the inner circumferential surface 62 of the column.
The distance C between the inner circumferential surface 62 of the adjacent column is the spherical roller 47
The outer circumferential surface 61 of the column and the inner circumferential surface 6 of the column are shorter than the corresponding diameters of the column.
Both of No. 2 have a long width in the circumferential direction, and the pillars 44 have strong rigidity.

Further, the radially outer end 94 of the connection point between the annular portion 43 on the outside of the bearing and the side surface 51 of the column is radially more than the radially outer end 95 of the connection point between the annular portion 42 on the inside of the bearing and the side surface 51 of the column. Since it is located inward in the direction and radially outward from the radially inner end 96 of the connection point between the annular part 42 on the inner side of the bearing and the side surface 51 of the column, the annular part 43 on the outer side of the bearing and the annular part on the inner side of the bearing Since at least one of the parts 42 and 42 has a long width in the radial direction, the pillar 44 that connects the annular part 43 on the outside of the bearing and the annular part 42 inside the bearing has a long width in the radial direction, so the rigidity of the pillar 44 is strong. Furthermore, since there is a large contact area between the side surface 51 of the column and the spherical roller 7, skew is less likely to occur on the spherical roller 47, and wear of the column 44 is reduced. Furthermore, since at least one of the annular portion 43 on the outside of the bearing and the annular portion 42 on the inside of the bearing has a long width in the radial direction, at least one of the annular portion 43 on the outside of the bearing and the annular portion 42 on the inside of the bearing has a long width in the radial direction. Since the contact area with the end face is large, the spherical roller 47 is difficult to skew.

Further, since the spherical rollers 7 are prevented from falling out of the pockets 45, it is possible to easily assemble the bearing and to automate the assembling of the bearing.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional double-row self-aligning roller bearing, Figure 2 is a plan view of the cage shown in Figure 1, and Figure 3 is a cross-sectional view of a conventional double-row self-aligning roller bearing.
The figure is an enlarged cross-sectional view taken along line X-X in Figure 2, Figure 4 is a cross-sectional view of a double-row self-aligning roller bearing showing an embodiment of the present invention, and Figure 5 is a plan view of the cage shown in Figure 4. Fig. 6 is an enlarged cross-sectional view taken along Y-Y in Fig. 5, Fig. 7 is an enlarged cross-sectional view taken along Z-Z in Fig. 5, and Fig. 8 shows the pocket during injection molding of the cage shown in Fig. 4. Fig. 9 is an explanatory diagram of removing the mold inside the pocket during injection molding of another cage used in this invention, and Figs. 10 to 15 are illustrations of this invention. A cross-sectional view of a double-row spherical roller bearing showing another embodiment of
FIG. 16 is an explanatory diagram of the radial clearance between the side surface of the column and the spherical roller. In the figure, 31 is an outer ring, 32 is an outer ring raceway, 33 is an inner ring, 34 is an inner ring raceway, 41 is a cage, 42 is an annular part on the inside of the bearing, 43 is an annular part on the outside of the bearing, 44 is a column, 45 is a pocket, 47 is a spherical roller, 51 is a side surface of a column, 52 is an axis of the spherical roller, 53 is a plane containing the axis of the bearing and the axis of the spherical roller, 54 is a plane containing the axis of the spherical roller, 55 are the rolling surfaces of the spherical rollers, 57 and 58 are concave curved surfaces, 94 is the radially outer end of the connection point between the outer annular part of the bearing and the side surface of the column;
95 is the radially outer end of the connection point between the annular portion inside the bearing and the side surface of the column, and 96 is the radially inner end of the connection point between the annular portion inside the bearing and the side surface of the column.

Claims (1)

[Claims] 1. The outer ring 31 has a spherical outer ring raceway 32, and the inner ring 33 disposed inside the outer ring 31 has a spherical outer ring raceway 32.
4, and a cage 41 is disposed between the outer ring 31 and the inner ring 33, and the cage 41 has an annular portion 42 on the inner side of the bearing and an annular portion 43 on the outer side of the bearing, and a plurality of columns 44. The two adjacent columns 44 have a spherical roller 47 in a pocket 45 between them.
In the double-row self-aligning roller bearing, the retainer 41 is made of synthetic resin, and the pocket 4 is
The side surface 51 of the column formed in No. 5 is a plane in which both sides in the axial direction with respect to the axial center of the side surface 51 of the column are perpendicular to a plane 53 that includes the axis of the bearing and the axis 52 of the spherical roller. Concave curved surfaces 57, 58 having arcs of curvature in accordance with the rolling surface 55 of the spherical roller in the axial and radial directions on the inner side of the bearing and the outer side of the bearing from the plane 54 that includes the axis 52 of the spherical roller. The retainer 41 has a portion where the distance B between the outer circumferential surface 61 of the column and the outer circumferential surface 61 of the adjacent column is shorter than the diameter of the corresponding portion of the spherical roller 47, and a portion adjacent to the inner circumferential surface 62 of the column. and a portion where the distance C from the inner circumferential surface 62 of the column is shorter than the diameter of the corresponding portion of the spherical roller 47, and in the radial direction of the connection point between the annular portion 43 on the outside of the bearing and the side surface 51 of the column. The outer end 94 is
Located radially inward from the radially outer end 95 of the connection point between the annular portion 42 inside the bearing and the side surface 51 of the column, and the annular portion 42 inside the bearing and the side surface 51 of the column
A double-row self-aligning roller bearing characterized in that it is located radially outward from the radially inner end 96 of the connection point with the radially inner end 96. 2. The radially inner end 97 of the connection point between the annular portion 43 on the outside of the bearing and the side surface 51 of the column is radially inner than the radially inner end 96 of the connection point between the annular portion 42 on the inside of the bearing and the side surface 51 of the column. A double-row self-aligning roller bearing according to claim 1 located inwardly.