JP2013204755A - Sealing device of rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing device of a rolling bearing which effectively discharges a foreign material entered between a slinger and a seal to prevent it from being retained therebetween.SOLUTION: A sealing device of a rolling bearing includes a seal 20 which is fixed at an outer ring 14 and which rotates with the outer ring 14 and a slinger 30 which is fixed at an inner ring 12 on an outer side of a bearing of the seal 20, wherein a circular gap formed between the seal 20 and the slinger 30 is formed outside of the bearing on a radial outer side of the slinger 30 to configure a labyrinth R, and a projection 33 is formed on an inner side of the bearing of the slinger 30.

Description

  The present invention relates to a rolling bearing sealing device.

  2. Description of the Related Art Conventionally, idler pulley rolling bearings used in, for example, automobile engine peripheral accessories, prevent water and dust (hereinafter collectively referred to as “foreign matter”) from entering the inside of the bearing. And a sealing device that covers the space between the outer ring and the inner ring with an annular seal. In this sealing device, the outer peripheral side of the seal is fixed to the outer ring, and a lip is provided on the inner peripheral side of the seal so as to be in sliding contact with the inner ring.

  Since the above-mentioned rolling bearing is used at high speed rotation, the lip slides with a small contact pressure, so-called light contact with the inner ring, in order to prevent heat generation of the lip slidingly contacting the inner ring. Therefore, it is difficult to prevent foreign matter from entering the bearing with only the seal. Therefore, there is a rolling bearing sealing device in which a shielding plate called a slinger is provided on the outer side of the seal so as to face the seal so that foreign matter does not directly hit the seal. (For example, see Patent Document 1)

JP-A-11-230179

  However, in the rolling bearing sealing device described above, the foreign matter that has entered the gap between the slinger and the seal stays, and the staying foreign matter approaches the sliding contact portion of the lip. As a result, foreign matter may enter the bearing. Therefore, it has been a problem for the rolling bearing sealing device to effectively discharge and retain foreign matter that has entered between the slinger and the seal.

  The present invention has been made to solve such a problem, and is a seal for a rolling bearing that can effectively discharge and retain foreign matter that has entered between the slinger and the seal. An object is to provide an apparatus.

  In order to solve the above-mentioned problems, the structural features of the rolling bearing sealing device according to claim 1 include a seal fixed to the outer ring and rotating together with the outer ring, and a bearing outer side of the seal and fixed to the inner ring. A rolling bearing sealing device comprising a labyrinth, wherein an annular gap formed between the seal and the slinger is opened to the outside of the bearing on the radially outer side of the slinger. Thus, a protrusion is formed on the inner side of the bearing of the slinger.

According to the rolling bearing sealing device of the first aspect, since the protrusion is formed on the inner side of the slinger bearing, the foreign matter that has entered between the slinger and the seal is dammed and effective in the radially outward direction. It is possible to reduce discharge and retention.
be able to.

  A structural feature of the rolling bearing sealing device according to claim 2 is that the protrusion is formed in a radial direction of the slinger.

  According to the rolling bearing sealing device of the second aspect, since the protrusion is formed in the radial direction, the foreign matter that has entered between the slinger and the seal is effectively dammed, and effectively outward in the radial direction. It is possible to reduce discharge and retention.

  The structural feature of the rolling bearing sealing device according to claim 3 is that the protrusion is below the axis of the sealing device when viewed in an axial cross section in a posture in which the sealing device is used. Is to be placed.

  According to the rolling bearing sealing device of the third aspect, since the foreign matter blocked by the protrusion is discharged in the direction of gravity, the discharged foreign matter can be prevented from falling again on the sealing device, and between the slinger and the seal. It can reduce that it stays in.

  The structural feature of the rolling bearing sealing device according to claim 4 is that the protrusion is made of an elastic body, is fixed to the slinger, and is in sliding contact with the end surface of the seal on the outer side of the bearing.

  According to the rolling bearing sealing device of claim 4, since the protrusion made of the elastic body is in sliding contact with the seal, the foreign matter intruding between the slinger and the seal is surely damped and effective radially outward. It is possible to reduce discharge and retention.

  ADVANTAGE OF THE INVENTION According to this invention, the sealing device of a rolling bearing which can reduce discharging | excluding foreign matter which invaded between a slinger and a seal | sticker effectively and can retain can be provided.

It is a fragmentary sectional view of the idler pulley which uses the bearing provided with the sealing device of the rolling bearing which is one Embodiment of this invention. It is an expanded sectional view of the part regarding the sealing device of the rolling bearing of FIG. It is an AA arrow directional view of the slinger in FIG. It is BB sectional drawing of the slinger in FIG.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment in which a rolling bearing sealing device of the invention is embodied will be described with reference to the drawings.
FIG. 1 is a partial cross-sectional view of an idler pulley 40 using a rolling bearing 10 provided with a rolling bearing sealing device according to an embodiment of the present invention. This will be described with reference to FIG.

  The rolling bearing 10 is an outer ring rotation type single row ball bearing used for an idler pulley 40 used in an engine peripheral accessory of an automobile, and includes an inner ring 12, an outer ring 14, a single row ball 16, and a ball 16, a retainer 18 that holds 16, a seal 20 that covers the space between the inner ring 12 and the outer ring 14, and a slinger 30 that is provided on the bearing outer side of the seal 20. Among these components, the seal 20 and the slinger 30 form a sealing device that seals the rolling bearing 10.

FIG. 2 is an enlarged cross-sectional view of a portion related to the rolling bearing sealing device of FIG. This will be described with reference to FIG.
The seal 20 includes a cored bar 21 and an annular elastic member 24 that is vulcanized and integrated with the cored bar 21.

  The core metal 21 includes a fixed portion 22 attached to a seal groove 15 provided at an inner peripheral surface end of the outer ring 14, and a core metal disc portion extending radially inward from the inner peripheral edge of the fixed portion 22. 23. As a material of the core metal 21, for example, SPCC of a cold rolled steel sheet that has been rust-proofed is used.

  The elastic member 24 is formed so as to cover the fixing portion 22 and is fitted into the seal groove 15; a base portion 26 formed from the fitting portion 25 along the outer peripheral surface of the cored bar portion 23; The lip 27 extends from the base portion 26 inward in the radial direction and inward of the bearing, and slidably contacts the slidable contact portion 13 formed perpendicular to the axis on the outer peripheral side of the inner ring 12. When the seal 20 rotates at a high speed together with the outer ring 14, the lip 27 rotates at a high speed while sliding on the sliding contact portion 13 of the inner ring 12. Therefore, the lip 27 is in light contact with the sliding contact portion 13. As a material of the elastic member 24, for example, nitrile rubber is used.

  The slinger 30 is on the bearing outer side of the seal 20 and has a cylindrical cylindrical portion 31 fitted to the end portion of the outer peripheral surface of the inner ring 12 and a radially outward portion from the outer edge of the cylindrical portion 31 on the bearing outer side. And a disc portion 32 that forms a labyrinth R with the inner peripheral surface of the outer ring 14. As a material of the slinger 30, for example, SPCC of a cold-rolled steel sheet that has been rust-proofed is used. Further, on the slinger 30, a protrusion 33 is continuously formed in the radial direction on the bearing inward side of the disc portion 32, and, for example, metal is formed by welding. The protrusion 33 is provided in close contact with the end face of the seal 20 on the outer side of the bearing in a non-contact manner.

FIG. 3 is an AA arrow view of the slinger 30 in FIG. This will be described with reference to FIG.
The protrusion 33 provided on the slinger 30 is disposed at one position on the lower side with respect to the axis of the sealing device as viewed in the axial cross section in the posture in which the sealing device is used.

4 is a BB cross-sectional view of the slinger 30 in FIG. This will be described with reference to FIG.
The protrusion 33 provided on the slinger 30 is formed to protrude on the bearing inward side of the disc portion 32.

Next, the operation of the sealing device for the rolling bearing 10 will be described with reference mainly to FIG.
In the rolling bearing 10, when the outer ring 14 rotates, the seal 20 fixed to the outer ring 14 rotates together with the outer ring 14 in the direction indicated by the arrow C. As the seal 20 rotates, a flow is generated in the air between the seal 20 and the slinger 30. As a result, the foreign substance 50 that has entered between the seal 20 and the slinger 30 moves in the direction indicated by the arrow D due to the flow of air. The moving foreign material 50 is blocked by the projection 33. And the foreign material 50 moves to the direction shown by the arrow E, and is discharged | emitted to the radial direction outward of a bearing.

  In addition, since the protrusion 33 is disposed on the lower side with respect to the axis of the bearing, the foreign matter 50 blocked by the protrusion 33 is discharged in the direction of gravity. Therefore, the rolling bearing 10 can prevent the discharged foreign matter 50 from falling on the sealing device again.

  Further, since the protrusion 33 is formed on the slinger 30 attached to the inner ring 12 that is a fixed ring, the distance between the protrusion 33 and the seal 20 can be maintained even when the rolling bearing 10 rotates. Therefore, the rolling bearing 10 can stably discharge the foreign matter 50 by the protrusion 33 and discharge it to the outside of the bearing.

  As described above, according to the rolling bearing sealing device according to the present embodiment, it is possible to reduce the foreign matter 50 that has entered between the slinger 30 and the seal 20 from being effectively discharged and retained.

  In the above-described embodiment, the protrusions 33 are continuously disposed at one place in the radial direction of the disk portion 32. However, the present invention is not limited to this, and for example, the protrusions 33 may not be in the radial direction and are continuous. You may apply to the structure which is not.

  Moreover, in the said embodiment, although the protrusion 33 was arrange | positioned in one place of the lower side with respect to the axis line of a bearing, it is not restricted to it, For example, by the environment etc. where the sealing device of a rolling bearing is used What is necessary is just to determine suitably the position and number which arrange | position a processus | protrusion.

  In the above-described embodiment, the protrusion 33 is provided in close contact with the end surface of the seal 20 on the outer side of the bearing in a non-contact manner. However, the present invention is not limited thereto. You may apply to the structure which consists of a made-up elastic body, makes a light contact, and makes sliding contact with the end surface of the seal 20 on the bearing outer side. Thereby, it is possible to reliably dam the foreign matter 50 that has entered between the slinger 30 and the seal 20, and to effectively discharge and stay radially outward.

  In the above-described embodiment, the slinger 30 is fitted to the end portion of the outer peripheral surface of the inner ring 12, but is not limited thereto. You may apply to the structure clamped between (for example, a volt | bolt).

  Moreover, although the said embodiment demonstrated the structure of the sealing device of the rolling bearing used for an idler pulley, of course, this invention is applicable also to the sealing device used for all rolling bearings.

10: Rolling bearing, 12: Inner ring, 13: Sliding contact part, 14: Outer ring, 15: Seal groove, 16: Ball, 18: Cage, 20: Seal, 21: Metal core, 22: Fixed part, 23: Core Gold disk part, 24: elastic member, 25: fitting part, 26: base part, 27: lip, 30: slinger, 31: cylindrical part, 32: disk part, 33: protrusion, 40: idler pulley, 50: Foreign matter, R: Labyrinth

Claims (4)

A seal fixed to the outer ring and rotating together with the outer ring; and a slinger fixed to the inner ring on the bearing outer side of the seal, and an annular gap formed between the seal and the slinger A rolling bearing sealing device which is opened to the outside of the bearing on the radially outer side of the labyrinth,
A rolling bearing sealing device, wherein a projection is formed on the inner side of the slinger.   2. The rolling bearing sealing device according to claim 1, wherein the protrusion is formed in a radial direction of the slinger.   The said protrusion is arrange | positioned below with respect to the axis line of the said sealing apparatus seeing in an axial direction cross section in the attitude | position in the state in which the said sealing apparatus is used. Rolling bearing sealing device.   4. The rolling bearing sealing device according to claim 1, wherein the protrusion is made of an elastic body, is fixed to the slinger, and is in sliding contact with an end surface of the seal on the outer side of the bearing. 5.

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