JP2008240896A - Double row roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double row roller bearing capable of increasing the grease enclosing amount inside the bearing and effectively supplying the enclosed grease to rolling elements. <P>SOLUTION: By forming a recessed part 26a on the outer peripheral face of a spacer 26, the amount of grease enclosed in a space of the outer periphery of the spacer 26 can be increased. By disposing a grease retaining member 50 for retaining the grease on the inside with its inner diameter end in close contact with the outer peripheral face of the spacer 26 on the outer periphery of the recessed part 26a, the grease can be retained in a space B formed by the grease retaining member 50 and the recessed part 26a of the spacer 26. Thereby, a large amount of grease is prevented from being supplied at once to a tapered roller 30 side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a double row roller bearing, and can be used for, for example, a bearing for an axle of a railway vehicle.

  FIG. 10 shows a schematic configuration of a railway vehicle drive system. As shown in the figure, the output of a drive source 101 such as a motor is transmitted to a drive device 105 having a small gear 103 and a large gear 104 via a joint 102, and after being decelerated at a predetermined gear ratio, is transmitted to an axle 106. Is done. At both ends of the axle 106, a car box 109 supported by a carriage frame 108 via a spring 107 is disposed. The axle 106 is rotatably supported by a bearing 110 disposed in the car box 109 and is held at an appropriate position with respect to the carriage frame.

  Main bearings used in railway vehicles include axles 110, driving devices 111 and 112, and motors 113 and 114. As the axle bearing 110, a double-row roller bearing such as a double-row cylindrical roller bearing or an outward-facing double-row tapered roller bearing is often used, and the lubrication is often performed with grease sealed inside the bearing. The drive device bearings 111 and 112 are bearings used to support the small gear 103 and the large gear 104, and are housed in the gear case 116, and inward double-row tapered roller bearings are often used. The drive device bearings 111 and 112 are often lubricated by splashing the lubricating oil 117 stored in the gear case 116 with the large gear 104.

  Patent Document 1 shows an example of a double row tapered roller bearing used for an axle of a railway vehicle. This bearing includes an integral outer member having a double row raceway surface on the inner periphery, an inner member in which a pair of inner rings having a raceway surface on the outer periphery are arranged in an axial direction through a spacer, and a raceway surface of the outer member. And a double row rolling element disposed between the raceway surface of the inner member. In this bearing, lubrication between the rolling elements and the raceway surface is performed by grease sealed in a space around the outer periphery of the spacer.

JP 2002-139054 A

  The double row roller bearing as described above is required to reduce the axial dimension in order to save the installation space. To achieve this, the axial dimension of the spacer is reduced and the inner rings It is effective to make them close. However, if the axial dimension of the spacer is reduced, the amount of grease enclosed in the outer space of the spacer is reduced, and there is a risk of poor lubrication due to insufficient grease. Even if sufficient grease is sealed in the outer space of the spacer, since there is no means for retaining the sealed grease in this part, a large amount of grease is supplied to the rolling elements at once, and instead the bearing There is a risk of increasing the rotational torque. In addition, when a large amount of grease is supplied to the rolling elements at once, the amount of grease that does not contribute to lubrication increases and grease consumption efficiency deteriorates.

  Therefore, an object of the present invention is to provide a double row roller bearing capable of increasing the amount of grease enclosed in the bearing and supplying the enclosed grease to the rolling elements efficiently.

  To achieve the above object, the present invention includes an outer member having a double row raceway surface on the inner periphery, and an inner member in which a plurality of inner rings having raceway surfaces on the outer periphery are arranged in an axial direction through a spacer, In the double row roller bearing provided with the double row rolling elements arranged between the raceway surface of the outer member and the raceway surface of the inner member, a recess is formed on the outer periphery of the spacer, and on the outer periphery of the spacer, A grease holding member is provided which holds grease inside and has an inner diameter end close to the outer peripheral surface of the spacer.

  Thus, in the double row roller bearing of the present invention, the amount of grease sealed in the outer space of the spacer can be increased by forming the recess on the outer peripheral surface of the spacer. In addition, a space formed by the grease holding member and the recess of the spacer is disposed on the outer periphery of the spacer by holding a grease holding member that holds the grease inside and has an inner diameter end close to the outer peripheral surface of the spacer. Therefore, it is possible to prevent a large amount of grease from being supplied to the rolling elements at once.

  For example, FIG. 11 shows a spacer 26 having an annular recess 26 a on the outer periphery and a grease holding member 150 that covers the outer periphery of the recess 26 a of the spacer 26. The grease holding member 150 includes a cylindrical base portion 152 and a flange portion 154 that extends from both axial end portions of the base portion 152 toward the inner diameter. Grease is held in the space B formed by the spacer 26 and the grease holding member 150, and this grease is transferred from the gap C between the inner diameter end of the grease holding member 150 and the outer peripheral surface of the spacer 26. Supplied to the moving body (indicated by dotted arrows in FIG. 11). However, since the grease held in the space B is often unevenly distributed on the outer peripheral portion (the lower portion in FIG. 11) due to gravity or centrifugal force, the grease is not easily discharged from the gap C, and lubricates the bearing in the space B. A large amount of useless grease that does not contribute may remain.

  Therefore, if the grease holding member is provided with a through hole in the axial direction, the grease held inside the grease holding member can be supplied to the rolling elements little by little through the through hole (see FIG. 4). Further, when the through hole has an inclined shape in which the rolling element side is displaced to the outer diameter side, the grease inside the grease holding member can be easily supplied to the rolling element side by gravity or centrifugal force (see FIG. 6). ).

  When the grease holding member is fixed to the outer member with a bolt, the grease holding member can be easily positioned and the grease can be easily replenished from the bolt hole.

  If the amount of grease held in the space between the grease holding member and the recess of the spacer is reduced, it may be difficult to discharge the grease from the through hole. Therefore, if a convex part that protrudes in the inner diameter direction from the inner peripheral surface of the outer member is formed inside the grease holding member, the grease is guided to both sides in the axial direction by the convex part. Can be supplied to the rolling element side, and waste of grease can be eliminated.

  Such a double row roller bearing can be suitably used as a railway vehicle axle bearing.

  As described above, according to the present invention, the amount of grease enclosed in the double row roller bearing is increased, and the enclosed grease can be efficiently supplied to the rolling elements.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a double row tapered roller bearing 1 as a double row roller bearing according to an embodiment of the present invention. This double row tapered roller bearing 1 is used as an axle bearing 110 of a railway vehicle as shown in FIG. 10, for example.

  The double-row roller bearing 1 includes an outer member 10 having double-row raceway surfaces 12 and 12 on the inner periphery, an inner member 20 having double-row raceway surfaces 24 and 24 on the outer periphery, and a raceway surface 12 of the outer member 10. , 12 and the raceway surfaces 24, 24 of the inner member 20 are mainly provided with double-row tapered rollers 30, 30. The outer member 10 is integrally formed and has radial bolt holes 14 at a plurality of locations in the circumferential direction at the central portion in the axial direction.

  The inner member 20 is formed by arranging a pair of inner rings 22 having raceway surfaces 24 on the outer periphery in the axial direction via spacers 26. The inner rings 22 and 22 and the spacer 26 are in contact with each other in the axial direction, whereby the inner rings 22 and 22 are positioned in the axial direction. The spacer 26 is formed in a substantially cylindrical shape, and an annular recess 26a is formed on the outer peripheral surface thereof.

  A grease holding member 50 that is disposed on the outer periphery of the recess 26a of the spacer 26 and holds grease therein is fixed to the inner periphery of the outer member 10. As shown in an enlarged view in FIG. 2, the grease holding member 50 includes a cylindrical base portion 52 and flange portions 54 and 54 extending from both axial ends of the base portion 52 toward the inner diameter. The base 52 is provided with bolt holes 53 at a plurality of positions in the circumferential direction of the intermediate portion in the axial direction. By fastening the bolt holes 53 and the bolt holes 14 of the outer member 10 with bolts 60, the grease holding member 50 is provided. It is fixed to the outer member 10. A convex portion 58 that protrudes in the inner diameter direction from the inner peripheral surface of the outer member 10 is provided on the entire circumference of the axially intermediate portion of the inner peripheral surface of the base 52 of the grease holding member 50. The convex portion 58 is formed in a substantially rectangular cross section, and concave portions 55 and 55 are formed on the entire circumference on both sides in the axial direction of the convex portion 58. The grease holding member 50 and the spacer 26 form a space B for holding grease.

  The inner diameter end of the flange portion 54 of the grease retaining member 50 is provided as close as possible to the outer peripheral surface of the spacer 26 within a range where it can be assembled without sliding contact with the outer peripheral surface of the spacer 26. An axial through hole 56 is formed in the outer peripheral portion of the flange portion 54. The through-holes 56 are provided at a plurality of locations in the circumferential direction, and in this embodiment, the through-holes 56 are provided at 8 locations at equal intervals in the circumferential direction (see FIG. 3). By appropriately setting the size, position, number, etc. of the through holes 56, the amount of grease supplied from the grease holding space B to the tapered rollers 30 through the through holes 56 can be adjusted.

  As described above, by forming the recess 26a in the spacer 26, the capacity of the grease holding space B can be increased, so that the axial dimension of the double row tapered roller bearing 1 can be reduced. Even if the axial dimension is reduced, sufficient grease can be held inside the bearing. Further, by holding the grease inside the grease holding member 50, it is possible to prevent the grease from being supplied to the tapered roller 30 side at once. As described above, the grease is prevented from leaking from the gap between the flange portion 54 and the spacer 26 by bringing the inner diameter end of the flange portion 54 of the grease holding member 50 close to the outer peripheral surface of the spacer 26. Thus, the grease can be held inside the grease holding space B more reliably.

  Further, by forming an axial through hole 56 in the flange portion 54 of the grease holding member 50, a small amount of grease in the grease holding space B can be supplied to the tapered roller 30 side through the through hole 56. . In addition, since the through hole 56 is provided in the outer peripheral portion of the flange portion 54, the grease in the grease holding space B can be discharged from the through hole 56 located in the lower portion in the circumferential direction to the tapered roller 30 side ( The grease held in the space B can be used without waste.

  Further, by forming the convex portion 58 on the inner peripheral surface of the base portion 52 of the grease holding member 50, even when the grease held inside the grease holding member 50 is reduced, the grease is The grease is guided to the recesses 55 on both sides in the axial direction, and the grease can be reliably supplied to the tapered roller 30 side through the through hole 56 (shown by a dotted line in FIG. 4). In order to reliably obtain such an effect, as shown in an enlarged view in FIG. 5, the outer diameter end position F of the through-hole 56 is outside the inner diameter end position E of the convex portion 58 of the inner peripheral surface of the base 52. It is preferable to design to be on the radial side.

  Further, the grease holding member 50 can be easily positioned by fixing the grease holding member 50 to the outer member 10 with the bolts 60. Further, by removing some of the bolts 60 at a plurality of locations in the circumferential direction, grease can be replenished inside the bearing through the bolt holes 14 of the outer member 10 and the bolt holes 53 of the grease holding member 50. Further, the convex portion 58 can be formed by the tip of the bolt 60 protruding in the inner diameter direction from the inner peripheral surface of the outer member 10.

  The embodiment of the present invention is not limited to the above. Hereinafter, another embodiment of the present invention will be described. In the following description, parts having the same configuration and function as those of the above embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the double-row tapered roller bearing of the embodiment shown in FIG. 6, the through hole 56 formed in the flange portion 54 of the grease holding member 50 has an inclined shape in which the tapered roller 30 side is displaced to the outer diameter side. The configuration is different from the above embodiment. In this way, by tilting the tapered roller 30 side of the through hole 56 toward the outer diameter side, the grease held inside the grease holding member 50 can be easily discharged to the tapered roller 30 side by gravity, centrifugal force, or the like. Therefore, when it is desired to increase the amount of grease supplied to the tapered roller 30 side, the configuration of this embodiment may be used. On the other hand, when it is desired to reduce the amount of grease supplied to the tapered roller 30 side, the inner diameter of the through-hole 56 is reduced or the number of the through-holes 56 is reduced. In contrast to the example shown in FIG. It is good also as the inclined shape which displaced the tapered roller 30 side of 56 to the inner diameter side (illustration omitted).

  In the double-row tapered roller bearing of the embodiment shown in FIG. 7, a convex portion 58 formed on the inner periphery of the base portion 52 of the grease holding member 50 is formed in a tapered shape that gradually increases in diameter from the central portion in the axial direction toward both sides. Therefore, the configuration is different from that of the above embodiment. Thus, by forming the convex portion 58 in a tapered shape, it becomes easier to guide the grease inside the grease holding member 50 to both sides in the axial direction than in the embodiment shown in FIG. be able to.

  In the double-row tapered roller bearing of the embodiment shown in FIG. 8, the grease retaining member 50 has an inclined through hole 56 (see FIG. 6) in which the tapered roller 30 side is displaced to the outer diameter side, and a tapered convex. Since the structure which combined the part 58 (refer FIG. 7) is comprised, the effect by these structures can be acquired simultaneously.

  In the above embodiment, the through-hole 56 is provided only in the outer peripheral portion of the flange portion 54 of the grease holding member 50. May be provided (not shown). As a result, the amount of grease supplied to the tapered roller 30 side is increased, and the contact portion between the tapered roller 30 and the raceway surface 12 of the outer member 10 and the contact portion between the tapered roller 30 and the raceway surface 24 of the inner member 20 are each. In addition, grease can be supplied in a well-balanced manner.

  Moreover, in the above embodiment, although the outer member 10 is integrally formed, it is not restricted to this. For example, in the embodiment shown in FIG. 9, a plurality of outer rings 11 having raceway surfaces on the outer periphery are arranged side by side in the axial direction via spacers 16. At this time, as shown in FIG. 9, if the spacer 16 and the grease holding member 50 are integrally formed, the fixing step of the spacer 16 and the grease holding member 50 can be eliminated. In this case, the bolt 60 is used for the purpose of closing the bolt hole 53 that functions as a grease replenisher.

  Further, in the above embodiment, the convex portion 58 formed on the inner periphery of the base portion 52 of the grease holding member 50 has a substantially rectangular cross section or a tapered shape, but there are concave portions on both axial sides of the convex portion 58. Other shapes may be used as long as the shape is formed and the grease is guided to the through hole 56.

  In the above embodiment, the case where the double-row tapered roller bearing of the present invention is used for an axle of a railway vehicle is shown, but the present invention is not limited to this and can be applied to other applications.

  In the above embodiments, the present invention is applied to a double row tapered roller bearing. However, the present invention is not limited to this, and the present invention is applied to other double row roller bearings such as a double row cylindrical roller bearing. You can also

It is sectional drawing of the double row tapered roller bearing concerning this invention. It is an expanded sectional view of the A part of FIG. It is a partial side view of a grease holding member. It is sectional drawing which shows a grease holding member and a spacer. It is an expanded sectional view which shows D section of FIG. It is an expanded sectional view of the double row tapered roller bearing which shows other embodiment of this invention. It is an expanded sectional view of the double row tapered roller bearing which shows other embodiment of this invention. It is an expanded sectional view of the double row tapered roller bearing which shows other embodiment of this invention. It is an expanded sectional view of the double row tapered roller bearing which shows other embodiment of this invention. It is sectional drawing which shows schematic structure of the drive system of a railway vehicle. It is sectional drawing which shows the comparative example of a grease holding member and a spacer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bearing 10 Outer member 12 Raceway surface 14 Bolt hole 20 Inner member 22 Inner ring 24 Raceway surface 26 Spacer 26a Recess 50 Grease holding member 52 Base 53 Bolt hole 54 Flange portion 55 Recess portion 56 Through hole 58 Protrusion portion 60 Bolt B Grease holding space

Claims (6)

An outer member having a double-row raceway surface on the inner periphery, an inner member in which a plurality of inner rings having a raceway surface on the outer periphery are arranged in an axial direction through a spacer, a raceway surface of the outer member, and a raceway surface of the inner member In a double row roller bearing provided with a double row rolling element arranged between
A double row characterized in that a recess is formed on the outer periphery of the spacer, and a grease holding member is provided on the outer periphery of the spacer, holding the grease inside and having an inner diameter end close to the outer peripheral surface of the spacer. Roller bearing.   The double row roller bearing according to claim 1, wherein an axial through hole is formed in the grease holding member.   The double row roller bearing according to claim 2, wherein the through hole has an inclined shape in which the rolling element side is displaced to the outer diameter side.   The double row roller bearing according to any one of claims 1 to 3, wherein the grease holding member is fixed to the outer member with a bolt.   The double row roller bearing according to any one of claims 1 to 4, wherein a convex portion protruding in an inner diameter direction from an inner peripheral surface of the outer member is formed inside the grease holding member.   The double row roller bearing according to any one of claims 1 to 5, wherein the double row roller bearing is used as a bearing for an axle of a railway vehicle.

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