JP4978074B2 - Sealing device - Google Patents

Description

  The present invention relates to a sealing device. The sealing device of the present invention is used, for example, as a hub bearing seal in the field of automobiles, or as a muddy water seal in agricultural machinery, construction machinery or general-purpose machines. The sealing device of the present invention can also be used for all rotating or reciprocating locations of automobiles, home appliances, industrial machines, bicycles and the like.

Conventionally, as a seal for a hub bearing used in an automobile-related field, a sealing device 51 shown in FIG. 3 is known. This sealing device 51 is attached to a bearing inner ring 61 and rotates with a slinger 52 that rotates together with the bearing inner ring 61. The lip seal 53 is attached to the bearing outer ring 62 and slides with the slinger 52.

As shown in detail in FIG. 4 , in the sealing device 51, the slinger 52 is made of a metal material, and a flange portion 52 b is integrally formed at one end in the axial direction of the cylindrical mounting portion 52 a toward the outer side in the radial direction. It is what is attached and it fits by the outer peripheral surface of the bearing inner ring | wheel 61 with the attaching part 52a.

  The lip seal 53 is configured by a combination of a metal mounting ring 54 and a rubber-like elastic body 55 attached to the mounting ring 54. The mounting ring 54 is made of a metal material, and is formed by integrally forming a flange portion 54b radially inward at the other axial end of the cylindrical mounting portion 54a. It is fitted on the inner peripheral surface. The rubber-like elastic body 55 is formed on the inner rubber portion 55a attached to the inner side of the attachment ring 54, the end surface rubber portion 55b attached to one end surface in the axial direction of the attachment ring 54, and the flange portion 52b of the slinger 52. An end surface lip 55c that is slidably in close contact with and a radial lip 55d that is slidably in close contact with the attachment portion 52a of the slinger 52 are integrally provided.

  The sealing device 51 is an assembly seal composed of a combination of a slinger 52 and a lip seal 53, and at the time of assembly, the end face lip 55c and the radial lip 55d are filled with grease G for lubricating the lip sliding portion. .

However, since the specification is such that the grease G is filled in this way, the sealing device 51 is built, so that the grease G adheres to the axial end surface (upper end surface in FIG. 4 ) of the end rubber portion 55b of the lip seal 53 . This has the following disadvantages.

That is, when the sealing device 51 is shipped, when a plurality of sealing devices 51 are stacked and shipped as shown in FIG. 5 , the end face rubber portion 55b is crimped to the mounting ring 54 of the adjacent (upper) sealing device. The sealing devices 51 may stick to each other due to the grease G adhering to the end rubber portion 55b. This adhesion is not a simple adhesion due to a rubber material, but is an adhesion caused by the grease G. Therefore, the adhesive force tends to increase significantly over time. It is difficult to take out. In particular, in the sealing device 51, since the end face lip 55c is disposed in the vicinity of the end face rubber portion 55b and toward the end face rubber portion 55b, the grease G for lubricating the end face lip 55c is used as the end face rubber. It tends to adhere to the portion 55b. Therefore, it is in a situation where the adhesion due to the adhesion of the grease G is particularly likely to occur, and countermeasures are demanded.

  Incidentally, the applicant of the present application has previously proposed a technique in which an anti-adsorption structure is provided on the metal ring of the sealing device with an encoder in the following Patent Document 1, but this prior art is unique to the sealing device with an encoder. Therefore, it has a configuration different from the present invention (for example, the suction prevention structure is made of metal, the suction prevention structure abuts on the encoder, etc.). In addition, the applicant of the present application has previously proposed a technology in which an anti-adhesion structure is provided in a sealing device made of a single lip seal without a slinger in Patent Document 2 below. This is to prevent the above adhesion, and has a configuration different from that of the present invention in that no grease or end face lip is involved in the cause of adhesion.

JP 2004-278619 A Japanese Utility Model Publication No. 6-30567

  The present invention has been made in view of the above points, and an object thereof is to provide a sealing device that can prevent the sealing devices from sticking to each other due to the grease adhering to the end rubber portion when a plurality of sealing devices are stacked. .

In order to achieve the above object, a sealing device according to claim 1 of the present invention comprises a combination of a slinger attached to one of two relatively rotating members and a lip seal attached to the other, and the lip seal is attached to the slinger. In the sealing device provided with an end surface lip that is slidably in close contact with the flange portion and an end surface rubber portion that comes into contact with an adjacent sealing device when a plurality of sealing devices are stacked, adhere to the end surface rubber portion The end rubber portion is provided with an anti-adhesion structure so that the end rubber portion does not adhere to the adjacent sealing device due to the sliding portion lubrication grease, and the anti-adhesion structure is provided with an annular axis perpendicular to the end rubber portion. It is characterized by comprising a surface roughening process with a roughness of 2 to 100 μm provided over the entire surface in a flat axial end surface .

  The sealing device according to claim 2 of the present invention is the sealing device according to claim 1, wherein a metal mounting ring is provided on the lip seal, and an end face rubber portion is attached to an axial end portion thereof. When the sealing device is stacked, the end rubber portion has a structure that contacts the metal mounting ring of the adjacent sealing device, and adheres to the surface of the end rubber portion that contacts the metal mounting ring of the adjacent sealing device. A prevention structure is provided.

In the sealing device of the present invention having the above-mentioned configuration, an anti-adhesion structure comprising a surface roughening process with a roughness of 2 to 100 μm is provided on the entire axial end surface of the annular axially perpendicular plane in the end rubber portion . Therefore, when a plurality of sealing devices are stacked, it is possible to prevent the end surface rubber portion from sticking to the adjacent sealing device due to the grease adhering to the end surface rubber portion (claim 1). In particular, it is possible to prevent sticking even when the other end of the rubber contact of the end face rubber part is a metal (metal mounting ring). As a specific example of the anti-adhesion structure, as described above, it is preferable to provide a surface roughening process with a roughness of 2 to 100 μm over the entire axial end surface of the annular axial perpendicular plane in the end rubber portion , According to this, it becomes difficult for the end face rubber portion to be pressed against the contact partner .

  The present invention has the following effects.

That is, in the sealing device of the present invention, as described above, the end rubber portion is provided with an anti-adhesion structure so that the end rubber portion does not stick to the adjacent sealing device due to the grease adhering to the end rubber portion. Since the anti-adhesion structure is made of a surface roughening process with a roughness of 2 to 100 μm provided over the entire axial end surface of the annular axially perpendicular plane in the end face rubber portion , this adhesion It is possible to prevent the end rubber portion from sticking to the adjacent sealing device due to the adhesion of grease by the anti-adhesive action exhibited by the prevention structure. The anti-adhesion structure reduces the adhesive force by reducing the crimping force when a plurality of sealing devices are stacked. Further, in the sealing device of the present invention, the end face lip is disposed near the end face rubber portion and toward the end face rubber portion, so that grease for lubricating the end face lip tends to adhere to the end face rubber portion. However, even under such circumstances, adhesion between the sealing devices due to the adhesion of grease can be effectively prevented. In addition, the anti-adhesion structure according to the present invention is provided on the surface of rubber, and can exhibit an anti-adhesion action even when the rubber contacts a metal. Thus, providing an anti-adhesion structure on the surface of the rubber so that the anti-adhesion action is exerted when the rubber contacts the metal is a technical idea unique to the present invention that is not disclosed in Patent Documents 1 and 2 above. Thus, it can be said that the present invention realizes a new development of the anti-adhesion structure.

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

FIG. 1 shows a sealing device 1 according to an embodiment of the present invention . The sealing device 1 according to the embodiment is used as a hub bearing seal (hub seal) in the automobile-related field, and is configured as follows.

  That is, the sealing device 1 includes a slinger (also referred to as a metal ring) 2 that is attached to a bearing inner ring (not shown) that is one of two relatively rotating members and rotates together with the bearing inner ring, and the other of the two members. And a lip seal (also referred to as a seal member) 3 that is attached to a bearing outer ring (not shown) and is slidably in close contact with the slinger 2. The lip seal 3 slides on the flange portion 2 b of the slinger 2. An end surface lip 5c that is freely in close contact is provided, and an end surface rubber portion 5b that is in contact with an adjacent sealing device 1 when a plurality of sealing devices 1 are stacked at the axial end of the lip seal 3 is provided. Adhering to the end rubber portion 5b is prevented so that the end portion rubber portion 5b does not adhere to the adjacent sealing device 1 by the sliding portion lubricating grease G adhering to 5b. Locking structure 6 is provided. Further, the lip seal 3 is provided with a metal mounting ring 4 and an end surface rubber portion 5b is attached to an end portion in the axial direction, and when the plurality of sealing devices 1 are stacked, the end surface rubber portion 5b is adjacent to the seal. An adhesion prevention structure 6 is provided on the surface of the end rubber portion 5b that contacts the metal mounting ring 4 of the device 1 and contacts the metal mounting ring 4 of the adjacent sealing device 1.

  The above components or components are configured as follows.

  That is, first, the slinger 2 is made of a metal material such as a sheet metal, and an outward flange portion 2b is integrally formed at one end in the axial direction of the cylindrical mounting portion 2a so as to be radially outward. The former mounting portion 2a is fitted on the outer peripheral surface of the bearing inner ring.

  On the other hand, the lip seal 3 is constituted by a combination of a metal mounting ring 4 and a rubber-like elastic body 5 attached to the mounting ring 4. The mounting ring 4 is made of a metal material such as a sheet metal, and an inward flange portion 4b is integrally formed radially inward at the other axial end of the cylindrical mounting portion 4a to form a substantially L-shaped cross section. The former mounting portion 4a is fitted on the inner peripheral surface of the bearing outer ring. The rubber-like elastic body 5 includes an inner rubber portion 5a attached to the inside of the attachment portion 4a and the flange portion 4b of the attachment ring 4, and an end rubber portion 5b attached to one end surface in the axial direction of the attachment portion 4a. An end face lip (side lip) 5c supported by the inner rubber part 5a and slidably in contact with the end face of the flange part 2b of the slinger 2; A required number of radial lips 5d slidably in close contact with the surface are integrally provided. The space around and between the end lip 5c and the radial lip 5d is filled with grease G for lubricating the lip sliding portion.

  Further, as shown in FIG. 1B, the anti-adhesion structure 6 is formed by surface roughening 7 on the axial end surface of the end rubber portion 5b, and the axial end surface of the end rubber portion 5b is Since it is formed in the shape of a ring-shaped plane perpendicular to the axis, surface roughening 7 is performed over the entire surface of the flat axial end face. The surface roughening process 7 can be arbitrarily set within a roughness range of 2 to 100 μm.

  The sealing device 1 having the above configuration is assembled in the state shown in FIG. 1 (A) and then shipped from the manufacturer. The grease G may adhere to the axial end surface of the end surface rubber portion 5b of the lip seal 3 or the end surface on the opposite side of the mounting ring 4. In particular, the end surface lip 5c is disposed in the immediate vicinity (inner diameter side) of the end surface rubber portion 5b. Moreover, since the end surface lip 5c is provided toward the end surface rubber portion 5b (outer diameter side), the grease G for lubricating the end surface lip 5c is likely to adhere to the end surface rubber portion 5b. Further, when the product is shipped, the sealing device 1 is handled in a state where a plurality of sealing devices 1 are stacked in the vertical direction as shown in FIG. The mounting ring 4 is crimped, and the grease G adheres to the mounting ring 4 as described above. Therefore, due to the viscosity of the grease G, the end rubber portion 5b and the mounting ring 4 of the sealing device 1 immediately above adhere to each other. It ’s easy.

However, in the sealing device 1 described above, since the surface roughening process 7 as described above is provided on the end rubber portion 5b that is easy to adhere, the pressure-bonding force is reduced, and the adhesive force is also reduced accordingly. Is done. Therefore, it becomes possible to prevent the sealing devices 1 stacked one above the other from sticking due to the adhesion of the grease G, or at least reduce the adhesive force and take out (separate) the sealing devices one by one. Can be facilitated .

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the sealing device based on the Example of this invention , (A) is the principal part sectional drawing, (B) is the principal part perspective view. Cross-sectional view of the main part showing a state in which a plurality of the sealing devices are stacked Sectional drawing of the principal part showing the mounting state of the sealing device according to the conventional example Cross-sectional view of the main part showing the state of the single sealing device Cross-sectional view of the main part showing a state in which a plurality of the sealing devices are stacked

DESCRIPTION OF SYMBOLS 1 Sealing device 2 Slinger 2a, 4a Mounting part 2b, 4b Flange part 3 Lip seal 4 Mounting ring 5 Rubber-like elastic body 5a Inner rubber part 5b End surface rubber part 5c End surface lip 5d Radial lip 6 Adhesion prevention structure 7 Surface roughening processing
G grease

Claims (2)

It consists of a combination of a slinger (2) attached to one of two relatively rotating members and a lip seal (3) attached to the other,
When a plurality of sealing devices (1) are stacked on the lip seal (3), an end surface lip (5c) that is slidably in close contact with the flange portion (2b) of the slinger (2), and the adjacent sealing device (1) In the sealing device (1) provided with the end rubber part (5b) in contact with
The end surface rubber portion (5b) prevents the end surface rubber portion (5b) from sticking to the adjacent sealing device (1) by the sliding portion lubricating grease (G) adhering to the end surface rubber portion (5b). Is provided with an anti-adhesion structure (6) ,
The anti-adhesion structure (6) is obtained from a surface roughening process (7) having a roughness of 2 to 100 μm provided over the entire axial end surface of the annular axially perpendicular plane in the end rubber portion (5b). sealing device characterized by comprising. The sealing device according to claim 1.
When the metal mounting ring (4) is provided on the lip seal (3) and the end rubber portion (5b) is attached to the axial end thereof, the end rubber portion is stacked when a plurality of sealing devices (1) are stacked. (5b) has a structure in contact with the metal mounting ring (4) of the adjacent sealing device (1), and an end face rubber portion (in contact with the metal mounting ring (4) of the adjacent sealing device (1) ( A sealing device characterized in that an anti-adhesive structure (6) is provided on the surface of 5b).

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