JP2008133885A - Combined rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combined rolling bearing increasing a sealing amount of a lubricant and preventing leakage of the lubricant from bearing abutting sides. <P>SOLUTION: End surfaces of inner rings 2 are directly abutted, on the abutting sides of two angular ball bearings 1, an annular sealing member 8 is inserted across a recessed stepped part 7 formed in the peripheral surface of each outer ring 3 to seal the abutting sides of the bearings, and sealing members 6 sealing portions between the inner rings 2 and outer rings 3 are mounted only on the opposite sides to the abutting sides. Thereby, the sealing amount of the lubricant to a common bearing space is increased, and there is no risk of leakage of the lubricant from the abutting sides of the bearings. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a combined rolling bearing in which a plurality of rolling bearings are butted in the axial direction.

  To support the rotating member, a plurality of rolling bearings in which a plurality of rolling elements are arranged in the bearing space between the inner and outer raceways are butted in the axial direction, and the bearing space of these butted rolling bearings is sealed. A combination rolling bearing in which a lubricant is sealed in the bearing space may be used (for example, see Patent Documents 1 and 2).

  Each of Patent Documents 1 and 2 is a combination ball bearing in which ball bearings are abutted to each other, and the bearing space of each ball bearing is individually separated by a seal member mounted between inner and outer raceways on both sides thereof. Sealed. In Patent Document 1, the inner ring and the outer ring of the deep groove ball bearing are formed with different widths, the end faces of one of the inner and outer rings are butted against each other, and the two rows of deep groove ball bearings are contacted. A preload is applied with an angle so that rigidity in the axial direction can be obtained like an angular ball bearing.

  Also, in the combination ball bearing, the inner ring and outer ring are formed with the same width as each other, the end faces of both the inner and outer rings are abutted, and only the opposite side of each ball bearing is in contact with the inner and outer rings. Some are sealed with a seal member mounted between the wheels (for example, see Patent Document 3).

Japanese Patent Application Laid-Open No. 2002-339961 JP 2006-125433 A JP 2003-74547 A

  Since the combination ball bearing as the combination rolling bearing described in Patent Documents 1 and 2 is equipped with a seal member between the races on both sides of each ball bearing, only the amount occupied by each seal member installed on the butt side There is a problem that the common bearing space is narrowed, the amount of lubricant such as grease is reduced, and the lubrication life is shortened.

  On the other hand, the combination ball bearing described in Patent Document 3 can widen the common bearing space and increase the amount of lubricant enclosed, but even if the inner ring and the outer ring have the same width as each other, When the end face of one of the inner and outer rings is abutted due to a slight dimensional error, a gap is generated between the end faces of the other race ring, and the lubricant on the abutting side of the bearing from the gap between the end faces There is a problem that leaks.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a combined rolling bearing that can increase the amount of lubricant enclosed and that does not leak lubricant on the butt side of the bearing.

  In order to solve the above-described problems, the present invention provides a combination of a plurality of rolling bearings in which a plurality of rolling elements are arranged in a bearing space between inner and outer ring raceways in an axial direction, and a combination of these abutting rolling bearings. In a combined rolling bearing in which the bearing space is sealed and a lubricant is sealed in the bearing space, the end surfaces of at least one of the inner and outer rings are sealed by sealing means on the abutting side of the rolling bearing, and the abutting is performed. Only the end face side that is not the side is employed that is sealed with a seal member that is mounted between the inner and outer races.

  That is, between the end faces of at least one of the inner and outer rings on the abutting side of the rolling bearing is sealed by a sealing means, and only on the end face side that is not the abutting side, is sealed with a seal member mounted between the inner and outer ring raceways. By doing so, the amount of lubricant enclosed can be increased, and the lubricant is prevented from leaking on the butt side of the bearing. Further, in this combined rolling bearing, since the lubricant can be sealed in a common bearing space and the amount of sealing can be managed in common, the sealing of the lubricant and the management of the amount of sealing can be facilitated.

  As a sealing means between the end faces of the bearing ring, a concave step portion is provided on the outer peripheral surface or the inner peripheral surface of the bearing ring on the abutting side, and annular seal members are provided on the concave step portions on both sides provided on the abutting side. It is possible to adopt a structure in which the end faces of the races are sealed.

  As a sealing means between the end faces of the bearing rings, an annular groove is provided in at least one of the end faces on the abutting side of the bearing rings, an O-ring is attached to the annular groove, and the end faces of the bearing rings are sealed. Can also be adopted.

  As a sealing means between the end faces of the bearing ring, a spacer is interposed between the end faces on the abutting side of the bearing ring, and a concave step portion is provided on the outer peripheral surface or the inner peripheral surface of the abutting side of the bearing ring, The annular projecting portions on both sides in the axial direction provided in the spacer are projected so as to face the concave stepped portions of the bearing rings in the radial direction, and the annular projecting portions and the bearing rings of the facing spacers are opposed to each other. It is also possible to employ a structure in which an annular groove is provided in at least one of the concave step portions, an O-ring is attached to each of the annular grooves, and the end surfaces of the raceway are sealed.

  Each of the above-described combined rolling bearings is suitable for a case where the plurality of rolling bearings butted in the axial direction are ball bearings.

  The combined rolling bearing of the present invention seals between the end faces of at least one of the inner and outer rings on the abutting side of the rolling bearing by a sealing means, and between the inner and outer ring raceways only on the end face side that is not the abutting side. Since it is sealed with the attached seal member, the amount of lubricant enclosed can be increased to extend the lubrication life, and there is no risk of the lubricant leaking on the butt side of the bearing. Further, in this combined rolling bearing, since the lubricant can be sealed in a common bearing space and the amount of sealing can be managed in common, the sealing of the lubricant and the management of the amount of sealing can be facilitated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a first embodiment. In this combined rolling bearing, two angular ball bearings 1 in which a plurality of balls 4 are held by a cage 5 are arranged in a bearing space between an inner ring 2 and an outer ring 3 and a counter bore portion 3a of the outer ring 3 is directed inward. These are combined ball bearings that face each other in the axial direction, and a lubricant such as grease is sealed in a common bearing space. The width of the inner ring 2 is formed larger than the width of the outer ring 3, and only the end surface of the inner ring 2 is abutted. A gap is formed between the end surfaces of the outer ring 3 on the abutting side.

  Each of the angular ball bearings 1 is provided with a seal member 6 between the inner ring 2 and the outer ring 3 only on the side opposite to the butting side, and both ends of a common bearing space in which a lubricant is sealed are sealed. Further, a concave stepped portion 7 is provided on the outer peripheral surface of each outer ring 3 on the abutting side, and an annular seal member 8 is attached to the concave stepped portion 7 so as to seal between the end surfaces of the outer ring 3 on the abutting side. Has been. In addition, between the end surfaces of the inner ring | wheel 2 is sealed by direct butting. In this embodiment, the seal member 8 is mounted on the concave step portion 7 provided on the outer peripheral surface side of the outer ring 3, but an annular seal member may be mounted on the concave step portion provided on the inner peripheral surface side of the outer ring 3. it can.

  FIG. 2 shows a second embodiment. This combined rolling bearing is also a combined ball bearing in which two angular ball bearings 1 are butted against each other in the same manner as in the first embodiment, and is provided on each end face on the butting side of the outer ring 3 with the gap therebetween. An annular groove 9 is provided, and the difference between the end faces of the outer ring 3 on the abutting side is sealed by an O-ring 10 mounted between the annular grooves 9. Other parts are the same as those of the first embodiment. The annular groove 9 in which the O-ring 10 is mounted may be provided only on the end face on the abutting side of either one of the outer rings 3.

  FIG. 3 shows a third embodiment. This combination rolling bearing is also a combination ball bearing in which two angular ball bearings 1 are butted against each other in the same manner as in the first embodiment, and a spacer 11 is provided between end faces on the butting side of the outer ring 3. The annular projecting portions 11a on both sides in the axial direction provided in the spacer 11 are projected so as to face the concave stepped portions 12 on both sides provided on the outer peripheral surface of the outer ring 3 in the radial direction. A difference is that the end surface of the outer ring 3 on the abutting side is sealed by an O-ring 14 attached to an annular groove 13 provided on the inner peripheral surface of each overhanging portion 11a. Other parts are the same as those of the first embodiment. The annular groove 13 for mounting the O-ring 14 may be provided in the concave step portion 12 of the outer ring 3.

  In the first to third embodiments described above, the angular ball bearing 1 is abutted in front-to-front alignment, but the back-to-back alignment in which each counter bore portion 3a of the outer ring 3 faces outward, and each counter bore in the outer ring 3 The part 3a may be abutted by parallel alignment with the same orientation.

  FIG. 4 shows a fourth embodiment. This combined rolling bearing is a combined ball bearing in which two deep groove ball bearings 21 in which a plurality of balls 24 are arranged in a bearing space between an inner ring 22 and an outer ring 23 and held by a cage 25 are abutted in the axial direction. As in the first embodiment, the seal member 26 is mounted between the inner ring 22 and the outer ring 23 only on the side opposite to the butting side, both ends of the common bearing space are sealed, and An annular seal member 28 is inserted and attached to a concave stepped portion 27 provided on the outer peripheral surface of each outer ring 23, and the end surface of the outer ring 23 on the abutting side is sealed. Further, the end faces of the inner ring 22 are sealed by direct butting.

  In each of the embodiments described above, the end face of the inner ring is directly abutted on the abutting side of the bearing, and the end faces of the outer ring are sealed by a sealing means such as an annular seal member or an O-ring. It is also possible to seal between the end faces with these sealing means. In addition, you may seal between the end surfaces of both an inner ring | wheel and an outer ring | wheel with these sealing means.

  Moreover, in each embodiment mentioned above, although the combination rolling bearing was set as the combination ball bearing which faced two ball bearings, the combination rolling bearing which concerns on this invention is what abutted roller bearings, and a ball bearing place. Different rolling bearings such as bearings may be abutted, and three or more of these rolling bearings may be abutted.

The longitudinal cross-sectional view which shows the combination rolling bearing of 1st Embodiment Longitudinal sectional view showing a combination rolling bearing of the second embodiment The longitudinal cross-sectional view which shows the combination rolling bearing of 3rd Embodiment The longitudinal cross-sectional view which shows the combination rolling bearing of 4th Embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Angular contact ball bearing 2 Inner ring 3 Outer ring 3a Counter bore part 4 Ball 5 Cage 6 Seal member 7 Concave step part 8 Seal member 9 Annular groove 10 O ring 11 Spacer 11a Overhang part 12 Concave step part 13 Annular groove 14 O ring 21 Deep groove ball bearing 22 Inner ring 23 Outer ring 24 Ball 25 Cage 26 Seal member 27 Concave step portion 28 Seal member

Claims (5)

  A plurality of rolling bearings in which a plurality of rolling elements are arranged in the bearing space between the inner and outer races are abutted and combined in the axial direction, the bearing space of these abutting rolling bearings is sealed, and a lubricant is added to the bearing space. In the enclosed combined rolling bearing, the end faces of at least one of the inner and outer rings of the inner and outer rings are sealed by sealing means on the abutting side of the rolling bearing, and the inner and outer rings of the inner and outer rings are sealed only on the end face side that is not the abutting side. A combined rolling bearing characterized by being sealed with a sealing member mounted therebetween.   The sealing means between the end faces of the bearing rings is provided with a concave step portion on the outer or inner peripheral surface of the bearing ring on the butting side of the bearing ring, and annular sealing members are provided on the concave step portions on both sides provided on the butting side. The combined rolling bearing according to claim 1, wherein the combined rolling bearing is mounted so as to be passed and sealed between end faces of the bearing rings.   The sealing means between the end faces of the bearing rings is provided with an annular groove on at least one of the end faces on the abutting side of the bearing rings, an O-ring is attached to the annular groove, and the end faces of the bearing rings are sealed. The combination rolling bearing according to claim 1.   The sealing means between the end faces of the bearing rings has a spacer interposed between the end faces on the abutting side of the bearing rings, and a concave step portion is provided on the outer peripheral surface or the inner peripheral surface of the bearing ring on the abutting side, The annular projecting portions on both sides in the axial direction provided in the spacer are projected so as to face the concave stepped portions of the bearing rings in the radial direction, and the annular projecting portions of the facing spacers and the bearing rings The combined rolling bearing according to claim 1, wherein an annular groove is provided in at least one of the concave stepped portions, an O-ring is attached to each of the annular grooves, and a space between the end faces of the raceway is sealed.   The combined rolling bearing according to any one of claims 1 to 4, wherein the plurality of rolling bearings butted in the axial direction are ball bearings.

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