JP2008051249A - Rolling bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rolling bearing to be assembled in a housing through an O-ring, capable of performing assembly of the O-ring without damage while preventing dropping-out thereof. <P>SOLUTION: The rolling bearing 10 comprises an outer ring 11, an inner ring 12, a plurality of rolling elements 13 disposed between the inner ring 12 and the outer ring 11 so as to freely roll, and a pair of ring-shaped sealing devices 14 installed to one of the outer ring 11 and the inner ring 12 so as to clamp the rolling elements 13. The O-ring 16 is assembled to a side end surface 19 of the outer ring 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rolling bearing, for example, a rolling bearing suitable for supporting a rotating part such as a driving force transmission control device disposed in an interior of a propeller shaft or in an intermediate part of a propeller shaft. .

  A rolling bearing in which a rotating wheel is fitted on a shaft and a fixed ring is fitted in a housing is used in order to prevent water or the like from entering the housing from the outside. It is assembled. However, if the rolling bearing and housing are loosely fit, or if the housing material is larger in linear expansion coefficient than the rolling bearing material even if it has a tightening allowance, the rolling bearing and housing Water will enter from the installation surface.

  As an example of a conventional rolling bearing, a rolling bearing equipped with an O-ring is known in order to prevent intrusion of water or the like (see, for example, Patent Document 1).

  As shown in FIG. 7, the rolling bearing 100 disclosed in Patent Document 1 includes an inner ring 101 having an inner ring raceway surface 102, an outer ring 103 having an outer ring raceway surface 104, a ball 105, and a cage 106. The inner ring 101 is fitted on a shaft (not shown), and the outer ring 103 is fitted on the housing 107. A pair of sealing devices 108 are assembled on both sides of the ball 105. A concave groove 109 is formed on the outer diameter surface of the outer ring 103, and an O-ring 110 is attached to the concave groove 109.

Japanese Patent Laying-Open No. 2005-321006 (FIG. 1)

  However, since the rolling bearing 100 disclosed in Patent Document 1 has the O-ring 110 mounted in the concave groove 109 provided on the outer diameter surface of the outer ring 103, the crushing allowance d10 of the O-ring 110 is set as the shaft. It is necessary to set in the bearing radial direction orthogonal to the direction. For this reason, when the rolling bearing 100 is assembled to the housing 107, the O-ring 110 and the inner peripheral surface 111 of the housing 107 are likely to be bitten, thereby damaging or damaging the O-ring 110. In such a case, the O-ring 110 may not be able to exhibit a predetermined performance and may not be able to prevent the intrusion of water or the like.

  An object of the present invention is to solve the above-described problems, and to provide a rolling bearing that can be assembled without damaging an O-ring and can guarantee a reliable sealing performance.

  The above object of the present invention is achieved by the following configurations.

(1) An outer ring having an outer ring raceway surface on an inner peripheral surface, an inner ring having an inner ring raceway surface on an outer peripheral surface, and a plurality of rolling elements disposed so as to be able to roll between the outer ring raceway surface and the inner ring raceway surface. In a rolling bearing comprising a moving body and a pair of annular sealing devices attached to one of the outer ring and the inner ring so as to sandwich the rolling element from the axial direction,
A rolling bearing comprising an O-ring assembled to a side end face of the outer ring.

  (2) An O-ring housing portion is formed on a side end face of the outer ring, and a drop-out preventing recess for holding the O-ring is formed on the inner diameter side or the outer diameter side of the O-ring housing portion. The rolling bearing according to claim 1, wherein

  (3) The rolling bearing according to claim 2, wherein the drop-out preventing recess is formed in a similar shape to an outer shape of the O-ring or a parting line protrusion provided on the O-ring.

  According to the configuration of (1), since the O-ring is assembled to the side end face of the outer ring, a crushing allowance is set in the axial direction. Thereby, when assembling to the housing, the biting between the inner peripheral surface of the housing and the like does not occur. Moreover, since it is not press-fitted with respect to the housing, there is no position shift. Therefore, the O-ring can be assembled without being damaged, and a reliable sealing performance can be ensured.

  According to the configuration of (2), the O-ring is accommodated in the O-ring accommodating portion at the side end face of the outer ring, and is fitted into the drop-off preventing concave portion by the elastic force accumulated by itself. As a result, the O-ring is held in the O-ring housing portion with a predetermined characteristic without being removed from the drop-out preventing recess, and the drop-out is prevented during assembly.

  According to the configuration of (3) above, if the drop-out preventing recess is formed in a shape similar to the outer shape of the O-ring, the operation for incorporating the O-ring into the drop-out preventing recess can be easily performed. Also, if the recess-preventing recess is formed in a similar shape to the parting line protrusions on the O-ring, the parting line protrusions that occur during molding can be used as means for preventing the O-ring from falling off. There is no need to add another structure as a means for preventing dropout. Thereby, since it can shape | mold with the conventional metal mold | die, the increase in a man-hour can be avoided.

  According to the present invention, in a rolling bearing assembled to a housing via an O-ring, the O-ring can be assembled without being damaged, and a reliable sealing performance can be ensured.

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

(First embodiment)
1 is a longitudinal sectional view of an upper half of a rolling bearing according to a first embodiment of the present invention, FIG. 2 is an enlarged view of a main part of the rolling bearing shown in FIG. 1, and FIG. 3 is a housing attachment of the rolling bearing shown in FIG. It is sectional drawing at the time.

  As shown in FIG. 1, a rolling bearing 10 according to a first embodiment of the present invention includes an outer ring 11, an inner ring 12, and a rolling element that is incorporated between an outer ring 11 and an inner ring 12 so as to be freely rollable in the circumferential direction. And a pair of shield plates 14 that are annular sealing devices mounted on the outer ring 11 so as to sandwich the balls 13, and a cage 15 that holds the balls 13 at equal intervals in the circumferential direction. A deep groove ball bearing to which a rubber O-ring 16 is attached and fixed to the housing.

  The outer ring 11 has a concave spherical outer ring raceway surface 18 formed at the center of the inner peripheral surface 17 of the outer ring. The outer ring 11 is formed with an O-ring accommodating portion 21 that is cut out in an annular shape from the outer ring outer peripheral surface 20 toward the outer ring inner peripheral surface 17 on the side end face 19, and the inner diameter of the O-ring accommodating portion 21 is formed. A recess 22 for preventing dropping is formed on the side. The outer ring 11 has a groove-shaped shield plate fixing portion 23 formed on both sides of the inner peripheral surface 17 of the outer ring.

  The inner ring 12 is formed with a concave spherical inner ring raceway surface 25 at the center of the inner ring outer peripheral surface 24 so as to face the outer ring raceway surface 18 of the outer ring 11.

  The shield plate 14 is integrally formed by covering a metal or resin cored bar 26 with a rubber material or a resin material, and the outer peripheral edge portion is attached and fixed to the shield plate fixing portion 23 of the outer ring 11. This is a contact type in which the lip 27 provided at the peripheral edge contacts the outer peripheral surface 24 of the inner ring.

  The cage 15 is a steel plate punched cage, and holds the balls 13 incorporated between the raceway surfaces 18 and 25 in a plurality of pockets 28 formed in the circumferential direction so as to roll freely. A predetermined lubricant is enclosed in the bearing space and used.

  Since the O-ring 16 is formed in an annular shape using, for example, fluorine rubber as a material, when the O-ring 16 is elastically deformed in a direction in which the inner diameter is increased or decreased, an elastic restoring force is applied in a direction in which the inner diameter is decreased or increased. accumulate.

  As shown in FIG. 2, the O-ring accommodating portion 21 is surrounded by the inner end surface 29 and the inner outer peripheral surface 30 and is continuously formed in the circumferential direction, and the length of the inner end surface 29 from the side end surface 19. The dimension L1 is smaller than the outer diameter dimension D1 of the O-ring 16. And, since the concave curved surface similar to the outer shape of the O-ring 16 is formed on the inner peripheral surface 30, the drop-preventing concave portion 22 is fitted into the O-ring housing portion 21. The O-ring 16 is fitted into the drop-off prevention recess 22 by the elastic force accumulated by itself. The O-ring 16 contacts the inner end surface 29.

  As shown in FIG. 3, the rolling bearing 10 is assembled to a housing 80 such as an automobile transmission via an O-ring 16, and the inner ring 12 is externally fitted to a shaft 81. At this time, the O-ring 16 is fitted into the O-ring accommodating portion 21 so as to be fitted into the drop-out preventing concave portion 21, and a crushing allowance d <b> 1 (D <b> 1-L <b> 1) is set in the axial direction with respect to the housing 80. Yes.

  When the rolling bearing 10 is assembled into the housing 80, the outer ring outer peripheral surface 20 of the outer ring 11 is press-fitted into the inner peripheral surface 82 of the housing 80, but the O-ring 16 is not press-fitted in the bearing radial direction, and the front end side in the assembling direction is After the contact with the housing 80, the rolling bearing 10 is assembled to the housing 80 only by being elastically deformed in the axial crushing margin d1, and from between the inner peripheral surface 82 of the housing 80 and the outer ring 11 is completed. Keep water tight by preventing water from entering.

  As described above, according to the rolling bearing 10, since the O-ring 16 is assembled to the side end face 19 of the outer ring 11, a crushing margin d <b> 1 is set in the axial direction. Thereby, when assembled to the housing 80, no biting or the like occurs between the inner peripheral surface 82 of the housing 80 and the like. Moreover, since it is not press-fit with respect to the housing 80, a positional shift does not occur. As a result, the O-ring 16 can be assembled without being damaged, and the O-ring 16 can be prevented from dropping during the assembly.

  Further, according to the rolling bearing 10, the O-ring 16 is accommodated in the O-ring accommodating portion 21 at the side end face 19 of the outer ring 11, and is dropped into the drop-off preventing concave portion 22 by the elastic force directed toward the inner ring. Inserted. As a result, the O-ring 16 is held in the O-ring housing portion 21 without being detached from the drop-out preventing recess 22.

  Further, according to the rolling bearing 10, the drop-out preventing recess 22 is formed in a shape similar to the outer shape of the O-ring 16, and therefore, the work for incorporating the O-ring 16 into the drop-out preventing recess 22 is easily performed. be able to.

(Second Embodiment)
Next, with reference to FIG. 4, the rolling bearing of 2nd Embodiment which concerns on this invention is demonstrated.
FIG. 4 is a longitudinal sectional view of the upper half of the rolling bearing according to the second embodiment of the present invention. In each of the following embodiments, the description of the components common to the first embodiment described above is simplified or omitted by attaching the same reference numerals or equivalent reference numerals.

  As shown in FIG. 4, the rolling bearing 40 according to the second embodiment of the present invention has a ring-shaped O-ring housing portion 41 that has a quadrangular concave shape at an intermediate position of the side end surface 19 of the outer ring 11. Is formed. The O-ring accommodating portion 41 is provided with a top plate 42 on the outer peripheral side, and the drop-out preventing recess 43 is formed on the inner outer peripheral surface 30.

  When the rolling bearing 40 is assembled in the housing 80 in the same manner as in FIG. 3, the side portion of the top plate 42 is brought into contact with the housing 80, so that the coupling force with the housing 80 around the O-ring 16 is increased. can do.

  In the present embodiment, the drop-out preventing recess 43 may be formed on the inner peripheral surface 44 of the top plate 42 on the outer diameter side instead of the inner outer peripheral surface 30 on the inner diameter side.

  This embodiment has the same operational effects as the first embodiment. Here, when the drop-out preventing recess 43 is formed on the inner peripheral surface 44 of the top plate 42 on the outer diameter side, the O-ring 16 is formed to have a slightly smaller diameter than the top plate 42. The O-ring 16 is inserted into the drop-out prevention recess 43 by the elastic force toward the outer circumferential direction accumulated by the O-ring 16, so that the O-ring 16 does not come off from the drop-out prevention recess 43 in the O-ring housing portion 41. Is retained.

(Third embodiment)
Next, a rolling bearing according to a third embodiment of the present invention will be described with reference to FIG.
FIG. 5 is a longitudinal sectional view of the upper half of the rolling bearing according to the third embodiment of the present invention.

  As shown in FIG. 5, the rolling bearing 50 according to the third embodiment of the present invention is an O-ring housing that is inside the side end face 19 of the outer ring 11 and has an annular shape on the inner peripheral side of the top plate 51. A portion 52 is formed. Further, a drop prevention recess 54 is formed on the inner peripheral surface 53 of the top plate 51.

  When the rolling bearing 50 is assembled in the housing 80 in the same manner as in FIG. 3, the side portion of the top plate 51 is brought into contact with the housing 80, so that the coupling force with the housing 80 around the O-ring 16 is increased. can do.

  This embodiment has the same operational effects as the first embodiment. In particular, since the drop-out prevention recess 54 is formed on the inner peripheral surface 53 of the top plate 51 on the outer diameter side, the drop-out prevention recess is caused by the elastic force in the outer peripheral direction in which the O-ring 16 is accumulated. The O-ring 16 can be held with predetermined characteristics without being disengaged from the drop-out preventing recess 54 in the O-ring accommodating portion 52 by being fitted into the O-ring accommodating portion 52.

(Fourth embodiment)
Next, with reference to FIG. 6, the rolling bearing of 4th Embodiment which concerns on this invention is demonstrated.
FIG. 6 is an enlarged vertical sectional view of a main part of a rolling bearing according to the fourth embodiment of the present invention.

  As shown in FIG. 6, the rolling bearing 60 of the present embodiment uses an O-ring 70 having a parting line projection 71 generated at the joint of the mold during molding. The parting line protrusions 71 are arranged in a pair at opposite positions on the outer peripheral surface of the O-ring 70.

  In the rolling bearing 60, a protruding portion insertion hole 61 that functions as a drop-out preventing recess is formed on the inner diameter side of the O-ring housing portion 21 on the side end face 19 of the outer ring 11. The protrusion insertion hole 61 is formed in a concave groove shape similar to the parting line protrusion 71 of the O-ring 70 on the inner outer peripheral surface 30. Therefore, when the O-ring 70 is fitted into the O-ring housing portion 21, the parting line protrusion 71 has the protrusion insertion hole 61 with the elastic force toward the inner circumferential direction where the O-ring 70 has accumulated. It is held without being inserted and removed.

  The protrusion insertion hole 61 is formed in each of the drop-off prevention recess 22 shown in the first embodiment, the drop-off prevention recess 43 shown in the second embodiment, and the drop-off prevention recess 54 shown in the third embodiment. It may be formed. By doing so, the parting line protrusions 71 of the O-ring 70 can be fitted into the respective protrusion insertion holes 61 so as to be positioned and prevented from falling off.

  This embodiment has the same operational effects as the first embodiment. In particular, since the existing parting line protrusion 71 provided on the O-ring 70 is used, it is not necessary to process, for example, a protrusion as a means for preventing the drop-off on the O-ring 70. By performing the molding as it is, an increase in the number of man-hours can be avoided.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  For example, as a rolling bearing, it goes without saying that it can be applied to various roller bearings and other types of rolling bearings in place of the illustrated deep groove ball bearing.

It is a longitudinal cross-sectional view of the upper half of the rolling bearing which is 1st Embodiment which concerns on this invention. It is a principal part enlarged view in the rolling bearing shown in FIG. It is sectional drawing at the time of housing installation of the rolling bearing shown in FIG. It is a longitudinal cross-sectional view of the upper half of the rolling bearing which is 2nd Embodiment which concerns on this invention. It is a longitudinal cross-sectional view of the upper half of the rolling bearing which is 3rd Embodiment which concerns on this invention. It is a principal part expansion longitudinal cross-sectional view of the rolling bearing which is 4th Embodiment which concerns on this invention. It is sectional drawing of the conventional rolling bearing.

Explanation of symbols

10, 40, 50, 60 Rolling bearing 11 Outer ring 12 Inner ring 13 Ball (rolling element)
14 Shield plate (sealing device)
16 O-ring 18 Outer ring raceway surface 19 Side end surface 21, 41, 52 O-ring housing portion 22, 43, 54, 61 Drop prevention recess 25 Inner ring raceway surface 71 Parting line protrusion 80 Housing

Claims (3)

An outer ring having an outer ring raceway surface on an inner peripheral surface, an inner ring having an inner ring raceway surface on an outer peripheral surface, and a plurality of rolling elements arranged to roll between the outer ring raceway surface and the inner ring raceway surface; In a rolling bearing provided with a pair of annular sealing devices attached to one of the outer ring and the inner ring so as to sandwich the rolling element from the axial direction,
A rolling bearing comprising an O-ring assembled to a side end face of the outer ring.   An O-ring housing portion is formed on a side end surface of the outer ring, and a drop-out preventing recess for holding the O-ring is formed on the inner diameter side or the outer diameter side of the O-ring housing portion. The rolling bearing according to claim 1.   The rolling bearing according to claim 2, wherein the drop-out preventing concave portion is formed in a similar shape to an outer shape of the O-ring or a parting line protrusion provided on the O-ring.

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