JP2012184814A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing capable of reliably preventing a foreign matter from entering the interior of a bearing until starting the use of the rolling bearing.SOLUTION: A deep groove ball bearing 10 (rolling bearing) includes an inner ring 12, an outer ring 11 and sealing devices 30 which seal annular spaces between the inner ring 12 and the outer ring 11, wherein each of the sealing devices 30 has an annular seal member 15 which is fit in and attached to the circumferential surface in the axial direction end part on an raceway side, of the outer circumference of the outer ring 11, which is extended toward the axial direction end part of the inner ring 12 and forms a labyrinth gap 17 between the tip part of the extension side and the outer circumference near the axial direction end part of the inner ring 12. In the deep groove ball bearing 10, the seal member 15 includes an extension part 15b which is extended toward the inner ring 12 direction and the axial direction outer side from the vicinity of the tip on inner ring 12 side, the sealing device 30 has an annular pressure-sensitive adhesive 18 which adheres the vicinity of the radial direction tip and the axial direction inner side of the extension part 15b, and the outer circumference from the line from which the vertex of the axial direction end part of an raceway side outer circumference of the inner ring 12 becomes annular to the lateral surface and, upon relative rotation of the deep groove ball bearing 10, the pressure-sensitive adhesive between the seal member 15 and the inner ring is changed to a repellent state from a sticky state to form the labyrinth gap.

Description

  The present invention relates to a rolling bearing.

Conventionally, a rolling bearing is sealed inside a fixed outer ring, a rotating inner ring, a rolling element disposed between the inner ring and the outer ring, a cage for holding the rolling element at a predetermined interval, and the inside of the bearing. Seal the peripheral surface (opening between the inner ring and outer ring) of the axial end of the rolling bearing in order to prevent grease and other lubricants from leaking to the outside and foreign materials from entering the bearing from the outside. And a sealing device for sealing with a member. The seal member is fitted and attached to the axial end of the inner ring surface of the outer ring, extends toward the axial end of the outer ring surface of the inner ring, and the extended tip forms a labyrinth gap between the inner ring and the inner ring. is doing.
In addition, rolling bearings have a need to rotate the bearing with low torque from the viewpoint of energy saving, and a torque reduction is realized by forming a labyrinth gap between the seal member and the inner ring of the bearing so as to be non-contacting. There is something. (Patent Document 1)

JP 2010-43693 A

However, when the rolling bearing described above is used by being incorporated in a vehicle, for example, as a preparation for incorporation in the vehicle, take out the bearing packed in a box in several dust-proof bags when procured from the bearing manufacturer. It is transferred to an assembly storage box whose upper part is open, and the assembly storage boxes containing the bearings are stacked and placed near the vehicle assembly place. At the vehicle assembly location, an operator takes out the rolling bearing from the assembly storage box and incorporates it into the vehicle.
When the rolling bearing is housed in the assembly storage box, the outer periphery of the bearing is exposed, so that foreign matter may enter the bearing from the labyrinth gap between the seal member and the inner ring due to the surrounding environment. Therefore, foreign matter intrudes into the bearing during storage or until it is used for the first time after it is installed in a device that uses a rolling bearing and the fixed ring and rotating wheel are relatively rotated (hereinafter simply referred to as “use start”). It has been a problem to prevent the problem.

  The present invention has been made to solve such problems, and provides a rolling bearing capable of reliably preventing foreign matter from entering the bearing during storage or until the rolling bearing is started to be used. For the purpose.

The structural features of the rolling bearing according to claim 1 include an inner ring having a raceway surface formed on an outer diameter surface,
An outer ring having a raceway surface on the inner diameter surface;
A sealing device for sealing an annular space between the inner ring and the outer ring,
One of the inner ring and the outer ring is a rotating wheel and the other is a fixed ring,
The sealing device is disposed between the rotating wheel and the fixed wheel, and is fitted and mounted on a peripheral surface of an axial end of the fixed ring on the raceway surface side, and faces the fitting and mounting side. A rolling bearing having an annular seal member extending toward the axial end of the rotating wheel and having a labyrinth gap formed between the extending end and the outer periphery in the vicinity of the axial end of the rotating wheel In
The seal member includes an extending portion that extends from the vicinity of the tip of the rotating wheel side toward the rotating wheel and outward in the axial direction,
The sealing device has an annular shape that closely contacts a radial tip end and an axially inner side of the extending portion, and an outer periphery from a line to a side surface where an apex of an axial end portion of the outer peripheral surface of the rotating wheel is annular. Having an adhesive layer of
At the time of relative rotation between the fixed ring and the rotating ring of the rolling bearing, the adhesive layer between the seal member and the rotating ring is separated from the adhesive state to form the labyrinth gap.

  According to the rolling bearing of claim 1, the labyrinth gap between the seal member fitted and attached to the fixed ring and the rotating ring is such that the extending portion of the seal member and the outer periphery of the rotating ring are in close contact with each other by the adhesive layer. Can be sealed. In addition, the rolling bearing can secure a labyrinth clearance by separating the extended portion and the rotating wheel that are in close contact with each other when the fixed wheel and the rotating wheel are relatively rotated. Thereby, the rolling bearing can reliably prevent foreign matter from entering the bearing until the relative rotation.

  A structural feature of the rolling bearing according to claim 2 is that the extension part and / or the rotating wheel form an annular concave part or convex part in a circumferential direction of a surface in contact with the adhesive layer.

  According to the rolling bearing of claim 2, the rolling bearing can reduce the adhesive force by reducing the adhesive area of the adhesive layer, and thus is easily separated at the time of relative rotation between the fixed ring and the rotating ring. On the other hand, in the rolling bearing, since the adhesive layer is formed in an annular shape in the circumferential direction until the relative rotation, the inside of the bearing can be sealed.

  The structural feature of the rolling bearing according to claim 3 is that the extending portion is substantially normal to the apex of the axial end of the outer peripheral surface of the rotating wheel, and is outside the extending portion. An annular groove is formed from the inside to the middle.

  According to the rolling bearing of claim 3, since the extension portion forms an annular groove, it becomes easy to be elastically deformed, and the close contact with the rotating wheel is surely made and the bearing can be sealed. Intrusion of foreign matter into the bearing can be prevented.

  According to the present invention, it is possible to provide a rolling bearing capable of reliably preventing foreign matter from entering the bearing during storage or until the rolling bearing is started to be used.

1st Embodiment: It is principal part sectional drawing of the rolling bearing of this invention. 1st Embodiment: It is the elements on larger scale of the extension part periphery in FIG. 1st Embodiment: It is the elements on larger scale of the extension part periphery in FIG. 2nd Embodiment: It is a partial expanded sectional view of the extension part periphery of the rolling bearing of this invention. 3rd Embodiment: It is a partial expanded sectional view of the extension part periphery of the rolling bearing of this invention. 3rd Embodiment: It is a partial expanded sectional view of the extension part periphery in FIG. 4th Embodiment: It is a partial expanded sectional view of the extension part periphery of the rolling bearing of this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a rolling bearing of the present invention is embodied will be described with reference to the drawings.
<First Embodiment>
FIG. 1 is a cross-sectional view of a main part of a deep groove ball bearing 10 (rolling bearing) of the first embodiment. The deep groove ball bearing 10 includes a fixed-side outer ring 11 (fixed ring) having a deep groove raceway surface 11a formed on an inner diameter surface and a rotation-side inner ring 12 (rotating wheel) having a deep groove raceway surface 12a formed on an outer diameter surface. ) And a plurality of balls 13 arranged between the inner and outer rings 11 and 12.

The ball 13 rolls on the raceway surfaces 11 a and 12 a of the inner and outer rings 11 and 12 as the inner ring 12 rotates.
Further, the balls 13 are held by a known cage 14 so that a predetermined interval is held between adjacent balls, so that the balls 13 can roll smoothly without being shifted or displaced on the transfer surfaces 11a and 12a. It has become.
Furthermore, grease or the like is sealed in the deep groove ball bearing 10 as a lubricant.

Further, an outer ring seal groove 11b is formed at both ends in the axial direction of the inner diameter surface of the outer ring 11 and beside the transfer surface 11a, and the base of the annular sealing device 30 is fitted and attached to the outer ring seal groove 11b. Yes. The sealing device 30 is formed by fixing a sealing member 15 made of synthetic rubber and having elasticity to a metal core 16.
The sealing device 30 extends toward the inside in the radial direction of the deep groove ball bearing 10, that is, toward the axial end of the outer diameter surface of the inner ring 12, and the tip end thereof is composed only of the seal member 15 and is a labyrinth between the inner ring 12. A gap 17 is formed. A seal projection 15 a protruding from the seal member 15 is formed on the inner surface of the sealing device 30, and the seal projection 15 a is configured by narrowing the entrance of the labyrinth gap 17 between the inner ring 12.
The sealing device 30 extends from the outer side in the axial direction of the distal end portion of the seal member 15 toward the inner ring 12 and toward the outer side in the axial direction to form an extended portion 15 b, and the extended portion 15 b is brought into close contact with the side surface of the inner ring 12. The inside of the deep groove ball bearing 10 is sealed.

As a result, the deep groove ball bearing 10 forms a labyrinth gap 17 between the seal member 15 and the inner ring 12, thereby suppressing the entry of foreign matter from the outside, and the entrance of the labyrinth gap 17 is narrowed by the seal convex portion 15a. Therefore, leakage of lubricant is suppressed.
Further, in the deep groove ball bearing 10, until the deep groove ball bearing 10 starts to be used, the extending portion 15 b is in close contact with the inner ring 12 to seal the inside of the deep groove ball bearing 10.

  FIG. 2 is a partially enlarged cross-sectional view around the extending portion 15b in FIG. 1 of the first embodiment, and shows a state until the deep groove ball bearing 10 is started to be used. The deep groove ball bearing 10 includes an adhesive 18 (adhesive layer) in the vicinity of the radial tip of the extending portion 15b that extends from the outer side in the axial direction of the tip of the seal member 15 toward the inner ring 12 and outward in the axial direction, and in the axial direction. ) Is applied. In the deep groove ball bearing 10, the extending portion 15 b of the seal member 15 and the adhesive portion 12 b on the side surface of the inner ring 12 are brought into close contact with the adhesive 18 to seal the inside of the deep groove ball bearing 10.

  Thereby, until the deep groove ball bearing 10 starts use, the deep groove ball bearing 10 can seal the inside of the deep groove ball bearing 10 and reliably prevent foreign matter from entering.

  FIG. 3 is a partially enlarged cross-sectional view around the extending portion 15b in FIG. 1 of the first embodiment, and is a view showing a state when the deep groove ball bearing 10 is started to be used. In the deep groove ball bearing 10, when the inner ring 12 rotates relative to the outer ring 11 shown in FIG. 1, the extending portion 15 b of the seal member 15 and the adhesive portion 12 b on the side surface of the inner ring 12 are in close contact with the adhesive 18. From the state where it has been separated, the state of separation is maintained by the restoring force of the elastic material.

Thereby, the deep groove ball bearing 10 can ensure the labyrinth gap 17 between the seal member 15 and the inner ring 12 after the start of use.
Moreover, since the adhesive 18 applied to the extending portion 15b moves to the outside (outside) of the deep groove ball bearing 10 after the start of use, the deep groove ball bearing 10 has the adhesive 18 to the inside of the deep groove ball bearing 10. Intrusion can be prevented.

Second Embodiment
FIG. 4 is a partially enlarged cross-sectional view around the extended portion 15c of the deep groove ball bearing 10 of the second embodiment, and is a view showing a state until the deep groove ball bearing 10 is started to be used. The difference from the deep groove ball bearing 10 of the first embodiment shown in FIG. 2 is that a concave portion 12 d that is recessed in an annular shape is formed in the circumferential direction of the surface that contacts the adhesive 18 on the side surface of the inner ring 12.

Until the deep groove ball bearing 10 starts using the deep groove ball bearing 10, the adhesive surface of the adhesive portion 12 b on the side surface of the inner ring 12 is formed in an annular shape in the circumferential direction, so that the extended portion 15 c of the seal member 15 The adhesive portion 12 b on the side surface of the inner ring 12 is in close contact with the adhesive 18 to seal the inside of the deep groove ball bearing 10.
In the deep groove ball bearing 10, when the inner ring 12 rotates relative to the outer ring 11 shown in FIG. 1, the extended portion 15 c of the seal member 15 and the adhesive portion 12 b on the side surface of the inner ring 12 are caused by the adhesive article 18. Since the adhesive area between the adhesive portion 12b on the side surface of the inner ring 12 and the adhesive article 18 is small and the adhesive force can be reduced from the state of being in close contact, it can be easily separated and maintained in a separated state by the restoring force of the elastic material.

Thereby, until the deep groove ball bearing 10 starts use, the deep groove ball bearing 10 can seal the inside of the deep groove ball bearing 10 and reliably prevent foreign matter from entering.
Further, the deep groove ball bearing 10 can be separated from the state in which the seal member 15 and the adhesive portion 12b on the side surface of the inner ring 12 are in close contact with each other by low torque relative rotation. A labyrinth gap 17 can be secured between them.
Furthermore, since the adhesive 18 applied to the extending portion 15 c moves to the outside (outside) of the deep groove ball bearing 10 after the start of use, the deep groove ball bearing 10 has the adhesive 18 to the inside of the deep groove ball bearing 10. Intrusion can be prevented.

<Third Embodiment>
FIG. 5 is a partially enlarged cross-sectional view around the extended portion 15d of the deep groove ball bearing 10 of the third embodiment, and shows a state until the deep groove ball bearing 10 starts to be used. The difference from the deep groove ball bearing 10 of the first embodiment shown in FIG. 2 is that the extending portion 15d is substantially in the normal direction H1 from the apex P1 of the axial end of the outer peripheral surface of the rotating wheel 12, This is to have an annular groove 19 from the outside of the extending portion 15d to the middle of the inside.

  Thereby, the deep groove ball bearing 10 is easily elastically deformed by the extension portion 15 d having the groove 19, and the close contact of the side surface of the inner ring 12 with the adhesive portion 12 b is ensured, and the deep groove ball bearing 10 is started to be used. In the meantime, the inside of the deep groove ball bearing 10 can be sealed to prevent foreign matter from entering.

  FIG. 6 is a partially enlarged cross-sectional view around the extending portion 15d in FIG. 5 of the third embodiment, and shows a state when the deep groove ball bearing 10 is started to be used. In the deep groove ball bearing 10, when the inner ring 12 rotates relative to the outer ring 11 shown in FIG. 1, the extended portion 15 d of the seal member 15 and the adhesive portion 12 b on the side surface of the inner ring 12 are in close contact with the adhesive 18. From the state where it has been separated, the state of separation is maintained by the restoring force of the elastic material.

Thereby, the deep groove ball bearing 10 can ensure the labyrinth gap 17 between the seal member 15 and the inner ring 12 after the start of use.
In addition, since the adhesive 18 applied to the extended portion 15d moves to the outside (outside) of the deep groove ball bearing 10 after the start of use, the deep groove ball bearing 10 has the adhesive 18 to the inside of the deep groove ball bearing 10. Intrusion can be prevented.

<Fourth embodiment>
FIG. 7 is a partially enlarged cross-sectional view around the extended portion 15e of the deep groove ball bearing 10 of the fourth embodiment. The difference with the deep groove ball bearing 10 of 1st Embodiment shown in FIG. 2 is that the arrangement | positioning of the adhesion surface of the extension part 15e and the inner ring 12 differs.

  Until the deep groove ball bearing 10 starts to be used, the deep groove ball bearing 10 has a radial direction of an extending portion 15e extending from the outer side in the axial direction of the front end portion of the seal member 15 toward the inner ring 12 and outward in the axial direction. An adhesive 18 is applied in the vicinity of the tip and on the inner side in the axial direction. In the deep groove ball bearing 10, the adhesive portion 18 is in close contact with the extended portion 15 e of the seal member 15 and the outer periphery 12 c from the line in which the apex P <b> 1 of the axial end of the raceway side outer periphery of the inner ring 12 is annular. The inside of the deep groove ball bearing 10 is sealed.

  In the deep groove ball bearing 10, when the inner ring 12 is rotated relative to the outer ring 11 shown in FIG. 1, the extended portion 15 e of the seal member 15 and the outer periphery 12 c of the inner ring are adhesive 18. The extended portion 15f maintains the state indicated by the two-dot chain line by the separation force of the elastic material from the state of being in close contact with each other.

  Thereby, until the deep groove ball bearing 10 starts use, the deep groove ball bearing 10 can seal the inside of the deep groove ball bearing 10 and reliably prevent foreign matter from entering.

Moreover, the deep groove ball bearing 10 can ensure the labyrinth gap 17 between the seal member 15 and the inner ring 12 after the start of use.
Furthermore, since the adhesive 18 applied to the extending portion 15f moves to the outside (outside) of the deep groove ball bearing 10 after the start of use, the deep groove ball bearing 10 has the adhesive 18 to the inside of the deep groove ball bearing 10. Intrusion can be prevented.

  Further, since the deep groove ball bearing 10 has a small amount of protrusion from the side surface of the deep groove ball bearing 10 after the start of use, the influence of the protrusion is reduced when the deep groove ball bearing 10 is incorporated into a device using the deep groove ball bearing 10. Can do.

As described above, according to the deep groove ball bearing 10 according to the present embodiment, until the deep groove ball bearing 10 starts to be used, the extending portions 15b to 15f extending from the tip portion of the seal member 15, Since the adhesive portions 12b and 12c of the inner ring 12 are in close contact with the adhesive 18 to seal the inside of the deep groove ball bearing 10, entry of foreign matter into the deep groove ball bearing 10 can be prevented.
Further, when the deep groove ball bearing 10 starts to be used, that is, when the inner ring 12 rotates relative to the outer ring 11, the deep groove ball bearing 10 adheres to the extended portions 15b to 15f of the seal member 15 and the side surface of the inner ring 12. The state where the parts 12b and 12c are in close contact with the adhesive 18 is separated from the state due to the restoring force of the elastic material. Thereby, the deep groove ball bearing 10 can ensure the labyrinth gap 17 between the seal member 15 and the inner ring 12 after the start of use.
Furthermore, since the adhesive 18 applied to the extending portions 15b to 15f of the seal member 15 moves to the outside (outside) of the deep groove ball bearing 10 since the deep groove ball bearing 10 starts to be used, the deep groove ball bearing 10 Intrusion of the adhesive 18 into the ball bearing 10 can be prevented.
As a result, damage to the raceway surface of the deep groove ball bearing 10 can be reduced.

  In the above-described embodiment, the deep groove ball bearing 10 is exemplified as the rolling bearing. However, the present invention is not limited to this and can be applied to a roller bearing such as a tapered roller bearing.

  Moreover, in the said embodiment, the ball | bowl as a rolling element illustrated the single row bearing, However, It is applicable not only to this but a rolling element to a double row bearing.

  Furthermore, in the above-described embodiment, the configuration in which the inner ring is a rotating ring and the outer ring is a fixed ring is illustrated as a rolling bearing, but the present invention is not limited to this, and the bearing is also configured to have an outer ring as a rotating ring and an inner ring as a fixed ring. Applicable.

  In the above-described embodiment, the configuration in which the adhesive 18 is applied to the extending portion 15c of the seal member 15 is illustrated. However, the configuration is not limited thereto, and the configuration in which the adhesive 18 is applied to the adhesive portion 12b of the inner ring 12 and the extension The present invention can also be applied to a structure that is applied to both the protruding portion 15c and the adhesive portion 12b.

10: Deep groove ball bearing (rolling bearing), 11: Outer ring (fixed ring), 11b: Outer ring seal groove, 12: Inner ring (rotating ring), 12b, 12c: Adhesive part, 12d: Recessed part, 13: Ball, 14: Holding 15: seal member, 15a: seal convex part, 15b, 15c, 15d, 15e, 15f: extension part, 16: cored bar, 17: labyrinth gap, 18: adhesive (adhesive layer), 19: groove, 30: Sealing device, H1: Normal direction, P1: Vertex

Claims (3)

An inner ring with a raceway surface formed on the outer diameter surface;
An outer ring having a raceway surface on the inner diameter surface;
A sealing device for sealing an annular space between the inner ring and the outer ring,
One of the inner ring and the outer ring is a rotating wheel and the other is a fixed ring,
The sealing device is disposed between the rotating wheel and the fixed wheel, and is fitted and mounted on a peripheral surface of an axial end of the fixed ring on the raceway surface side, and faces the fitting and mounting side. A rolling bearing having an annular seal member extending toward the axial end of the rotating wheel and having a labyrinth gap formed between the extending end and the outer periphery in the vicinity of the axial end of the rotating wheel In
The seal member includes an extending portion that extends from the vicinity of the tip of the rotating wheel side toward the rotating wheel and outward in the axial direction,
The sealing device has an annular shape that closely contacts a radial tip end and an axially inner side of the extending portion, and an outer periphery from a line to a side surface where an apex of an axial end portion of the outer peripheral surface of the rotating wheel is annular. Having an adhesive layer of
At the time of relative rotation between the fixed ring and the rotating wheel of the rolling bearing, the adhesive layer between the seal member and the rotating wheel is separated from the adhesive state, and forms the labyrinth gap. Rolling bearing.   2. The rolling bearing according to claim 1, wherein the extending portion and / or the rotating wheel forms an annular concave portion or convex portion in a circumferential direction of a surface in contact with the adhesive layer.   The extending portion is formed in a substantially normal direction from the apex of the axial end of the outer periphery of the rotating wheel on the raceway surface side, and an annular groove is formed from the outside of the extending portion to the middle of the inside. The rolling bearing according to claim 1 or 2.

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