JP4228202B2 - Sealing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sealing device, and more particularly, to a sealing device having a mating sliding member such as a slinger and a seal lip slidably in close contact with the mating sliding member. The sealing device of the present invention is used for, for example, a seal part of an agricultural machine or a seal part of a construction machine or the like.
[0002]
[Prior art]
Conventionally, as this type of sealing device, for example, a sealing device 1 shown in FIG. 3 is known. This sealing device 1 is a metal slinger which is a mating sliding member provided with a flange portion 4 at one end of a cylindrical portion 3. 2, a rubber-like elastic body 5 joined to the attachment surface 3a of the cylindrical portion 3 of the slinger 2 and the outer end surface 4a and the distal end peripheral surface 4b of the flange portion 4, and the peripheral surface 3b and flange of the cylindrical portion 3 of the slinger 2 And a lip seal 6 having a plurality of seal lips 7, 8, 9, and 10 slidably in close contact with the inner end face 4c of the portion 4.
[0003]
In the sealing device 1 having the above-described configuration, the so-called side lip is slidably in close contact with the inner end surface 4c of the flange portion 4 of the slinger 2 which is the mating sliding member among the plurality of seal lips 7, 8, 9, and 10. In order to stabilize the sliding operation of the seal lip 10, the inner end face 4c of the flange portion 4 is cut and planarized in the manufacturing process. .
[0004]
FIG. 4 is an explanatory diagram of this cutting process. Before the cutting process, the inner end face 4c of the flange portion 4 is formed in the shape of a dotted line in the figure. Further, in this state, the rubber-like elastic body 5 joined to the front end peripheral surface 4b of the flange portion 4 is joined to the entire front end peripheral surface 4b. Then, when the inner end face 4c of the flange portion 4 is cut from the dotted line state, a part 5a of the rubber-like elastic body 5 joined to the tip peripheral surface 4b of the flange portion 4 is also cut simultaneously.
[0005]
However, since the rubber-like elastic body 5 is flexible in material, it may be bent at the time of cutting and escape from the cutting tool blade. In such a case, a part 5a of the rubber-like elastic body 5 is cut off. It will remain in the product as a burr.
[0006]
Therefore, conventionally, it is necessary to remove the remaining burrs one after another in the quality control process after cutting, and thus there is a disadvantage that much time and labor are required for the production.
[0007]
In addition, as a prior art document, a sealing device having a side lip is often found (for example, Patent Document 1), but it is difficult to find a combination of a side lip and a slinger joined with a rubber-like elastic body.
[0008]
[Patent Document 1]
JP-A-9-287619 [0009]
[Problems to be solved by the invention]
In view of the above points, the present invention can prevent the rubber-like elastic body joined to the other sliding member such as the slinger from being burred by cutting, thereby performing the deburring operation. An object of the present invention is to provide a sealing device that can improve the quality of a product.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a sealing device of the present invention is joined to a mating sliding member provided with a flange portion at one end of a cylindrical portion, an attachment surface of the cylindrical portion, an outer end surface of the flange portion, and a tip peripheral surface. In a sealing device having a rubber-like elastic body and a seal lip slidably in close contact with the inner end surface of the flange portion, the inner end surface of the flange portion is cut in a manufacturing process. An annular stepped portion is provided on the inner end surface, and a part of the inner end surface protrudes in the axial direction from the rubber-like elastic body joined to the front end peripheral surface of the flange portion, and only the protruding part of the inner end surface is cut. It is characterized by being processed.
[0011]
In the prior art shown in FIGS. 3 and 4, there is a possibility that the rubber-like elastic body joined to the mating sliding member such as a slinger is burred. The reason is that the inner end face of the flange portion of the mating sliding member is cut. This is because the rubber-like elastic body joined to the peripheral surface of the tip of the flange portion was to be cut at the same time, and the reason why it was necessary to cut at the same time was as shown in FIG. This is because the inner end face of the flange portion and the rubber-like elastic body are on the same plane (dotted line).
[0012]
On the other hand, in the sealing device of the present invention having the above-described configuration, as described above, an annular step portion is provided on the inner end surface of the flange portion, and a part of the inner end surface is joined to the tip peripheral surface of the flange portion. Since it protrudes in the axial direction from the rubber-like elastic body and only the part of the protruding inner end face is cut, the rubber-like elasticity is obtained when the inner end face of the flange portion of the mating sliding member is cut. You don't have to cut your body at all. Therefore, it is possible to prevent the rubber-like elastic body from escaping from being burred.
[0013]
In the present invention, if this is regarded as a manufacturing method of a sealing device, a mating sliding member provided with a flange portion at one end of the tube portion, an attachment surface of the tube portion, an outer end surface and a tip peripheral surface of the flange portion And a rubber-like elastic body joined to the flange portion and a seal lip slidably in contact with the inner end surface of the flange portion, and the inner end surface of the flange portion is cut in the manufacturing process. In this embodiment, an annular stepped portion is provided on the inner end surface of the flange portion, and a part of the inner end surface protrudes in the axial direction from the rubber-like elastic body joined to the front end peripheral surface of the flange portion. Only the inner end face of the material is cut.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 shows a cross section of a main part of a sealing device 1 according to an embodiment of the present invention.
[0016]
The sealing device 1 according to the embodiment is used as a hub bearing seal in a bearing portion of an agricultural machine or a construction machine, for example, and is configured as follows.
[0017]
That is, first, a metal slinger (also referred to as a rubber baking sleeve) 2 is provided as a mating sliding member in which a flange portion (also referred to as a radial direction portion) 4 is integrally formed at one end of a cylindrical portion (also referred to as an axial direction portion) 3. The rubber-like elastic body 5 is attached to the attachment surface (inner peripheral surface) 3a of the cylindrical portion 3 of the slinger 2 and the outer end surface 4a and front end peripheral surface (front end outer peripheral surface) 4b of the flange portion 4 by vulcanization adhesion or the like. It is joined in the form of a film.
[0018]
In addition, a plurality of (four in the figure) seal lips 7, 8, 9, and 10 that are slidably in close contact with the peripheral surface (outer peripheral surface) 3b of the cylindrical portion 3 of the slinger 2 and the inner end surface 4c of the flange portion 4 are provided. A lip seal (also referred to as a rubber seal) 6 is provided, and each of the seal lips 7, 8, 9, 10 is connected to a rubber-like elastic body 12 joined to a metal mounting ring 11 by vulcanization adhesion or the like. It is integrally molded as a part.
[0019]
Among the plurality of seal lips 7, 8, 9, and 10, it is a seal lip of reference numeral 10 called a so-called side lip that is slidably in close contact with the inner end surface 4c of the flange portion 4 of the slinger 2. In order to stabilize the sliding operation of the seal lip 10, the inner end surface 4 c of the flange portion 4 is cut and planarized in the manufacturing process. It is done like this.
[0020]
That is, as shown in FIG. 2, when the slinger 2 is manufactured prior to cutting, an inner high-shaped step portion 13 having an annular shape is formed on the inner end surface 4 c of the flange portion 4. A part of the inner end face 4d on the radially inner side is more protruded in the axial direction one side (upward in the figure) than the inner end face 4e on the radially outer side of the step part 13. A rubber-like elastic body 5 is joined to the slinger 2 formed in such a shape.
[0021]
As described above, the rubber-like elastic body 5 is joined to the attachment surface 3a of the cylindrical portion 3 of the slinger 2 and the outer end surface 4a and the distal end peripheral surface 4b of the flange portion 4, and particularly to the entire end peripheral surface 4b. However, according to the above-described configuration, the distal end peripheral surface 4b itself is disposed radially outward from the step portion 13, and therefore, the inner end surface 5b of the rubber-like elastic body 5 and the flange portion 4 are Comparing with a part of the inner end face 4d, a part of the inner end face 4d of the latter flange portion 4 protrudes in one axial direction rather than the inner end face 5b of the former rubber-like elastic body 5.
[0022]
Therefore, when the inner end face 4c of the flange portion 4 is cut, this cutting is performed only on the inner end face 4d of a part of the latter flange portion 4 as shown by a dotted line in FIG. The elastic body 5 is not scheduled to be cut at all. Therefore, according to the sealing device 1, since the situation that the rubber-like elastic body 5 escapes from the cutting does not occur at the time of cutting the flange portion 4, the situation where the rubber-like elastic body 5 escapes the cutting and becomes burred. Can be prevented from occurring. According to the sealing device 1, the inner end surface 5 b of the rubber-like elastic body 5 remains flush with the inner end surface 4 e of the other part of the flange portion 4. It is.
[0023]
In this embodiment, as shown in the figure, the flange portion 4 is pressed and the entire thickness thereof is bent to form the step portion 13 on the inner end surface 4c. May be formed by an original cutting process or the like. In this case, the corresponding outer height step 14 is not formed on the outer end face 4 a of the flange portion 4.
[0024]
【The invention's effect】
The present invention has the following effects.
[0025]
That is, in the sealing device of the present invention having the above-described configuration, as described above, a rubber-like shape in which an annular step portion is provided on the inner end surface of the flange portion and a part of the inner end surface is joined to the front end peripheral surface of the flange portion. Since it protrudes in the axial direction from the elastic body and only a part of the protruding inner end face is cut, the rubber-like elastic body is completely removed when cutting the inner end face of the flange portion of the mating sliding member. No need to cut. Accordingly, it is possible to prevent the rubber-like elastic body from escaping from cutting and burr, and to improve the quality of the product without performing the burr removal work as intended.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part of a sealing device according to an embodiment of the present invention. FIG. 2 is an explanatory view showing a cutting process in the sealing device. ] Explanatory drawing showing the cutting process in the sealing device [Explanation of symbols]
1 Sealing device 2 Slinger (mating member)
3 cylindrical portion 3a mounting surface 3b peripheral surface 4 flange portion 4a outer end surface 4b distal end peripheral surface 4c inner end surface 4d partial inner end surface 4e inner end surface 5,12 rubber-like elastic body 6 lip seals 7, 8, 9, 10 Seal lip 11 Mounting ring 13, 14 Step part

Claims (1)

A mating sliding member (2) provided with a flange portion (4) at one end of the cylindrical portion (3), an attachment surface (3a) of the cylindrical portion (3), and an outer end surface (4a) of the flange portion (4) And a rubber-like elastic body (5) joined to the tip peripheral surface (4b), and a seal lip (10) slidably in close contact with the inner end face (4c) of the flange portion (4), In the sealing device (1) in which the inner end face (4c) of the flange portion (4) is cut in the manufacturing process,
An annular stepped portion (13) is provided on the inner end surface (4c) of the flange portion (4), and a part of the inner end surface (4d) is joined to the tip peripheral surface (4b) of the flange portion (4). The sealing device is characterized in that it protrudes in the axial direction from the cylindrical elastic body (5) and only a part of the protruding inner end face (4d) is cut.

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