JP2017190804A - Seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal that enhances sealing performance by a labyrinth seal so as to exhibit excellent sealability while increasing the sealability of a metal fitting portion on the inner peripheral side of a seal flange.SOLUTION: Provided is a seal in which a magnetic encoder made of magnetic rubber is attached on an atmosphere side surface of a seal flange mounted on the circumference of a rotary member and being in slidably contact with a stationary side seal lip, and a non-contact type labyrinth seal by forming a radial gap is provided on outer peripheral side of the seal flange, and that comprises an inner circumferential lip which is in close contact with the circumference of the rotary member integrally provided in the inner peripheral end part of the magnetic encoder. A bent part is provided at the outer peripheral end part of the seal flange; and by providing cylindrical rubber, which is held by the bent part, at the outer peripheral end part of the magnetic encoder, the axial width of the labyrinth seal is set.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sealing device according to a sealing technique. The sealing device of the present invention is used, for example, as a hub bearing seal for a vehicle such as an automobile or other industrial bearing seal.

  Conventionally, as shown in FIG. 3, a slinger 111 mounted on the outer periphery of a rotating member 51 such as a rotating shaft or a bearing inner ring, and a lip member 121 mounted on the inner periphery of a stationary member 61 such as a housing or a bearing outer ring. A sealing device 101 is known that is composed of a combination and suppresses the entry of external foreign matter such as water on the atmosphere side (outside the machine) O, muddy water, salt water, or dust into the machine interior I.

  The slinger 111 has a cylindrical portion 112 fitted to the outer peripheral surface of the rotating member 51 and a seal flange 113 provided radially outward from the outer end of the cylindrical portion 112. doing.

  The lip member 121 has a cylindrical mounting portion 122 fitted to the inner periphery of the stationary member 61, and a seal lip (end surface lip) 123 that slidably contacts the machine inner end surface of the seal flange 113. Yes.

  In addition, a magnetic encoder 131 made of magnetic rubber combined with a magnetic sensor for detecting the rotation speed, rotation angle, and the like of the rotating member 51 is attached to the machine outer end face of the seal flange 113 in the slinger 111.

  Further, a non-contact type labyrinth seal 132 is provided on the outer peripheral side of the seal flange 113 and between the seal flange 113 and the mounting portion 122 of the lip member 121 by forming a radial gap c.

JP 2012-67821 A

  The sealing device 101 having the above configuration is required to be further improved in the following points.

The rotating member 51 such as the rotating shaft or the bearing inner ring is made of metal, and the slinger 111 is also made of metal. Accordingly, a fitting portion between metals is set here, and this metal fitting portion is not sealed by an elastic body such as rubber. Accordingly, a gap (not shown) is formed in the metal fitting portion, and the following phenomenon may occur due to the gap.
・ External foreign matter such as water, muddy water, salt water, or dust may enter the cabin I.
-Air may enter the in-flight I, or the air in the in-flight I may flow out to the out-of-flight O.
・ Grease in the cabin I may flow out of the cabin O.

Moreover, since the seal flange 113 of the slinger 111 is formed in a straight flat shape in the radial direction, the non-contact type labyrinth seal 132 set on the outer peripheral side of the seal flange 113 has a short axial width w _0. Is. Therefore, the labyrinth seal 132 that exhibits a sealing action due to the fact that the external foreign matter does not easily pass through the narrow radial gap c may not exhibit sufficient sealing performance.

  In view of the above, the present invention provides a sealing device that can improve sealing performance at a metal fitting portion on the inner peripheral side of a seal flange and improve sealing performance by a labyrinth seal, thereby exhibiting excellent sealing performance. For the purpose.

  In order to achieve the above object, the sealing device of the present invention has a magnetic encoder made of magnetic rubber attached to the atmosphere-side end face of the seal flange that is mounted on the outer periphery of the rotating member and that comes into contact with the stationary-side seal lip. In addition, in the sealing device provided with a non-contact type labyrinth seal by forming a radial gap on the outer peripheral side of the seal flange, an inner peripheral lip that is in close contact with the outer peripheral surface of the rotating member at the inner peripheral end of the magnetic encoder In the axial direction of the labyrinth seal by providing a bent portion at the outer peripheral end portion of the seal flange and providing a cylindrical rubber portion held by the bent portion at the outer peripheral end portion of the magnetic encoder. The width is set.

In the sealing device of the present invention having the above-described configuration, the inner peripheral lip that is in close contact with the outer peripheral surface of the rotating member is integrally provided at the inner peripheral end of the magnetic encoder. A seal is formed, and the following sealing action is exhibited.
-Suppresses the entry of foreign objects such as water, muddy water, salt water or dust into the machine.
-Suppresses the intrusion of air into the aircraft or, on the contrary, the outflow of air inside the aircraft.
-Suppresses the in-flight grease from flowing out of the machine.

  Therefore, this inner peripheral lip can compensate for the lack of sealing performance at the metal fitting portion.

  In the sealing device of the present invention, a labyrinth seal is provided by providing a bent portion at the outer peripheral end of the seal flange and by providing a cylindrical rubber portion held by the bent portion at the outer peripheral end of the magnetic encoder. Since the axial width is set, the axial width of the labyrinth seal is enlarged as compared with the prior art of FIG.

  Therefore, the sealing performance by the labyrinth seal can be enhanced by such a seal width setting.

In addition, as the shape of the bending part provided in a seal flange, the following two aspects are suitable.
An inclined surface portion is provided obliquely from the seal flange in one axial direction and radially outward, and a radial straight portion is provided radially outward from the outer peripheral end of the inclined surface portion.
・ An inclined surface portion is provided obliquely from the seal flange to one axial direction and radially outward, and an axial straight portion is provided from the outer peripheral end of the inclined surface portion to one axial direction. A radial straight portion is provided from the tip portion to the radially outward direction.
According to these configurations, since the axial width of the seal flange is amplified by the inclined surface portion or by the inclined surface portion and the axial straight portion, the axial width of the cylindrical rubber portion can be expanded, The axial width of the labyrinth seal can be increased.

  In the present invention, by providing the inner peripheral lip, the sealing performance at the inner periphery of the seal flange can be improved, and by increasing the axial width of the labyrinth seal, the sealing performance by the labyrinth seal can be increased, and thus excellent. A sealing device that exhibits sealing performance can be provided.

Sectional drawing of the principal part of the sealing device which concerns on 1st Example of this invention. Sectional drawing of the principal part of the sealing device which concerns on 2nd Example of this invention. Sectional drawing of the principal part of the sealing device which concerns on a prior art example

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

First embodiment ...
As shown in FIG. 1, the sealing device 1 according to this embodiment includes a slinger 11 that is mounted on the outer periphery of a rotating member 51 such as a rotating shaft or a bearing inner ring and rotates together with the rotating member 51, and a stationary member such as a housing or a bearing outer ring. It is configured by a combination with a lip member 21 that is mounted on the inner periphery of 61 and slidably contacts the slinger 11, and external foreign matter such as water, muddy water, salt water, or dust on the atmosphere side (outside the machine) O Suppresses intrusion.

  The slinger 11 is made of a metal material, and is integrally provided with a seal flange (outward flange portion) 13 radially outward at an outer end portion of the tubular portion 12. The inner peripheral surface is fitted to the outer peripheral surface of the rotating member 51. Since the rotation member 51 is made of metal, a metal fitting portion is set here.

  The lip member 21 includes an attachment ring 22 and a rubber-like elastic body 25 attached (cross-linked) to the attachment ring 22. The mounting ring 22 is made of a metal material, and is provided with a flange portion (inward flange portion) 24 integrally provided radially inward at an end portion on the inner side of the tubular portion 23. The outer peripheral surface is fitted to the inner peripheral surface of the stationary member 61. Thus, the rubber-like elastic body 25 has an outer peripheral rubber portion 26 attached to the outer peripheral surface of the cylindrical portion 23 of the mounting ring 22, an end surface rubber portion 27 attached to the end surface of the cylindrical portion 23, and a cylindrical shape. The inner peripheral rubber part 28 attached to the inner peripheral surface of the part 23, the lip holding part 29 attached to the end face of the flange part 24, and the seal flange 13 of the slinger 11 held by the lip holding part 29 A first seal lip (first end lip) 30 that is slidably in contact with the inner end face, and is also held by the lip holding portion 29 on the inner peripheral side of the first seal lip 30 and slid on the inner end face of the seal flange 13. A second seal lip (second end surface lip) 31 and a grease slip 32 that are in contact with each other are integrally provided.

  An annular magnetic encoder 41 made of magnetic rubber combined with a magnetic sensor (not shown) is attached to the end face of the seal flange 13 on the outside of the machine in order to detect the rotational speed and rotational angle of the rotating member. In addition, an annular inner peripheral lip 42 that is in close contact with the outer peripheral surface of the rotating member 51 is integrally provided at the inner peripheral end of the magnetic encoder 41.

An annular non-contact labyrinth seal 43 is formed by forming a radial gap c on the outer peripheral side of the seal flange 13 and between the seal flange 13 and the inner peripheral rubber portion 28 of the lip member 21. . In addition, the labyrinth seal 43 is provided with an annular bent portion 14 at the outer peripheral end of the seal flange 13 and a cylindrical rubber portion 44 held by the bent portion 14 at the outer peripheral end of the magnetic encoder 41. As a result, the axial width w ₁ of the labyrinth seal 43 is set to be longer than that in the prior art of FIG. 3 (w ₁ > w ₀ ).

  As the shape of the bent portion 14, an inclined surface portion 15 provided on one side in the axial direction (inner side) from the seal flange 13 and obliquely outward in the radial direction, and a radial direction from the outer peripheral end of the inclined surface portion 15. The radial direction straight portion 16 is provided in the outward direction, whereby the axial thickness of the seal flange 13 is substantially enlarged.

The cylindrical rubber portion 44 provided integrally with the outer peripheral end portion of the magnetic encoder 41 is formed such that its inner end protrudes further toward the inner side than the inner end surface of the seal flange 13. The amount (width) that can be projected is limited. Therefore, as described above, the bent portion 14 is provided at the outer peripheral end of the seal flange 13 to substantially increase the axial thickness of the seal flange 13, thereby increasing the axial width of the cylindrical rubber portion 44. Thus, the axial width w ₁ of the labyrinth seal 43 can be enlarged.

  The sealing device 1 having the above configuration is provided with a non-contact type labyrinth seal 43 by forming a radial gap c on the outer peripheral side of the seal flange 13 attached to the outer periphery of the rotating member 51, and Since a contact-type lip seal is provided by contact between the first and second seal lips 30 and 31, external foreign matter such as water, muddy water, salt water or dust on the atmosphere side (outside the machine) O enters the in-machine I. However, in addition, the following configuration improves the sealing performance against external foreign matter.

  That is, since the inner peripheral lip 42 that is in close contact with the outer peripheral surface of the rotating member 51 is integrally provided at the inner peripheral end portion of the magnetic encoder 41, the inner peripheral lip 42 includes the combination of the rotating member 51 and the slinger 11. A contact-type rubber lip seal is formed on the outer side of the metal fitting portion. Therefore, the inner peripheral lip 42 exerts a sealing action to suppress the entry of external foreign matter such as water, muddy water, salt water, or dust into the machine I, and the air enters the machine I, or vice versa. I air can be prevented from flowing out of the machine O, grease in the machine I can be prevented from flowing out of the machine O, and the lack of sealability at the metal fitting portion can be compensated. Has been.

  When an annular tapered surface 52 as shown in the figure is provided on the outer peripheral surface of the rotating member 51, the inner peripheral lip 42 may be in contact with the tapered surface 52. The tapered surface 52 is inclined so that its outer diameter dimension gradually increases from the outside O side to the inside I side. And when the inner peripheral lip 42 is in contact with the tapered surface 52 in this way, the inner peripheral lip 42 is pressed against the tapered surface 52 when pressure by muddy water or the like acts from the outside O side. Compared with the case where the outer peripheral surface of the rotating member 51 is an axially straight surface, the sealing performance by the inner peripheral lip 42 can be further enhanced.

Further, an annular bent portion 14 is provided at the outer peripheral end portion of the seal flange 13, and a cylindrical rubber portion 44 held by the bent portion 14 is provided at the outer peripheral end portion of the magnetic encoder 41, whereby the labyrinth seal 43 is axially arranged. Since the width w ₁ is set, the axial width w ₁ of the labyrinth seal 43 is enlarged (w ₁ > w ₀ ) compared to the prior art of FIG. Therefore, it is possible to improve the sealing performance by the labyrinth seal 43.

Second embodiment ...
In the first embodiment, the shape of the bent portion 14 provided on the seal flange 13 is a combination of the inclined surface portion 15 and the radial straight portion 16, but an axial straight portion having a cylindrical shape is added to these. By doing so, the axial width of the labyrinth seal 43 can be further expanded.

As an example in this case, in the sealing device 1 shown in FIG. 2 as the second embodiment, the bent portion 14 is provided on one side in the axial direction (inner side) from the seal flange 13 and obliquely outward in the radial direction. The inclined surface portion 15, the axial straight portion 17 having a cylindrical shape provided from the outer peripheral end portion of the inclined surface portion 15 toward one side in the axial direction (inner side), and the radial direction from the distal end portion of the axial straight portion 17. This is a combination with the radial straight portion 16 provided outward, whereby the axial width of the cylindrical rubber portion 44 is further expanded, and the axial width w ₂ of the labyrinth seal 43 is further increased. It has been further expanded (w ₂ > w ₁ > w ₀ ). Therefore, it is possible to further improve the sealing performance by the labyrinth seal 43.

  Other configurations and operational effects of the sealing device 1 according to the second embodiment are the same as those of the first embodiment. Therefore, the same reference numerals are given and description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 Sealing device 11 Slinger 12, 23 Cylindrical part 13 Seal flange 14 Bending part 15 Inclined surface part 16 Radial direction straight part 17 Axial direction straight part 21 Lip member 22 Mounting ring 24 Flange part 25 Rubber-like elastic body 26 Outer rubber part 27 End face Rubber part 28 Inner peripheral rubber part 29 Lip holding part 30, 31 Seal lip 32 Grease slip 41 Magnetic encoder 42 Inner peripheral lip 43 Labyrinth seal 44 Cylindrical rubber part 51 Rotating member 52 Tapered surface 61 Static member c Radial gap

Claims (3)

A magnetic encoder made of magnetic rubber is attached to the atmosphere side end face of the seal flange which is mounted on the outer periphery of the rotating member and slidably contacts the stationary seal lip, and a radial gap is formed on the outer peripheral side of the seal flange. In a sealing device provided with a non-contact type labyrinth seal by
An inner peripheral lip that is in close contact with the outer peripheral surface of the rotating member is integrally provided at the inner peripheral end of the magnetic encoder,
The axial width of the labyrinth seal is set by providing a bent portion at the outer peripheral end of the seal flange and providing a cylindrical rubber portion held by the bent portion at the outer peripheral end of the magnetic encoder. A sealing device characterized by. The sealing device according to claim 1.
The bent part is provided on one side in the axial direction from the seal flange and obliquely provided radially outward, and provided radially outward from an outer peripheral end of the inclined surface part. A sealing device comprising a radial straight portion. The sealing device according to claim 1.
The bent portion is an inclined surface portion that is provided on one side in the axial direction from the seal flange and obliquely outward in the radial direction, and an axis provided on the one axial direction from the outer peripheral end of the inclined surface portion. A sealing device comprising: a directional straight portion; and a radial straight portion provided radially outward from a tip portion of the axial straight portion.

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