JP3367802B2 - Sealing member manufacturing method and sealing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a sealing member used in a sealing device and a sealing device including the sealing member. In particular, it is characterized in that a plurality of types of sheet materials having different materials are laminated in a corrugated plate shape.

[0002]

2. Description of the Related Art Conventionally, there is an oil seal 103 as a sealing device for sealing between a housing 101 and a shaft 102 as shown in FIG.

The oil seal 103 is a reinforcing ring 104.
The outer peripheral ring portion 104a is fitted to the inner peripheral portion of the housing 101, and a rubber elastic seal portion 105 is provided on the inner peripheral side of the radial portion 104b of the reinforcing ring 104.

The seal portion 105 comprises a lip tip portion 105a that contacts the shaft 102, and two inclined surfaces 105b and 105c on both sides of the lip tip portion 105a, the sealing fluid side M'and the anti-sealing fluid side O '. Configured, and in addition,
A spring 106 that applies a tightening force to the shaft 102 of the lip tip portion 105a is provided on the outer peripheral side of the seal portion 105, and is a portion that exhibits the sealing property of the oil seal 103.

Further, in order to exert the sealing performance of the oil seal in the prior art, the above two inclined surfaces 105 are used.
b, the angle and shape of 105c, the shape characteristics such as the contact width and contact pressure of the lip tip portion 105a are changed, and the rubber-like elastic body as the seal portion 105 composed of rubber, a filler, an additive, and the like is used. Various measures have been taken so that the desired sealing performance can be exhibited by changing the compounding composition.

By the way, in the industrial fields such as automobiles, construction machinery, and industrial equipment where a large amount of oil seals are used, in consideration of recent resource saving and environmental problems, improvement of fuel efficiency, downsizing, weight saving, It is designed to have a longer life.

[0007]

From the background described above, the oil seal is used as an oil seal to reduce the torque loss by reducing friction and at the same time improve the wear resistance to improve the life. What satisfies various required quality and functional characteristics at the same time, such as stabilizing the leakage amount within a certain range for a long period of time, is desired.

As described above, in developing an oil seal having improved quality and functions, it is important to change the above-mentioned shape characteristics and the composition of the rubber-like elastic body. However, there are cases where this is not enough effect.

As one example, as a method of improving the wear resistance of the lip portion, there is a method of adding graphite or Teflon powder having excellent wear resistance to the compounding component as a part of the filler of the rubber composition. However, if an oil seal is prepared by simply mixing these components, the abrasion resistance is certainly improved, but the oil resistance of the rubber composition and the sealing performance may be deteriorated.

Therefore, in order to satisfy various contradictory required characteristics, various oil seals having different compounding compositions of the rubber-like elastic material and a large number of oil seals having different shape characteristics of the lip portion have been experimentally manufactured and tested. According to the method, an optimum value is obtained and used.

On the other hand, Japanese Utility Model Application Laid-Open No. 62-200865 discloses an oil seal in which a material harder than a rubber-like elastic material is embedded in the sliding surface of a seal portion formed of a rubber-like elastic material.

FIG. 11 is a cross-sectional explanatory view of the oil seal 200, which shows a sliding surface 20 which is a slope on one side of the edge 203.
In FIG. 2, the rubber-like elastic material 201 and the screw-shaped pieces 204 made of a harder material are alternately formed, and by bringing a plurality of different materials into contact with the sliding surface (composite material), This is an example of what makes it possible to satisfy various contradictory required characteristics as described above by utilizing the characteristics of the material.

As a method of manufacturing the oil seal 200 of FIG. 11, as shown in FIG. 12 (a), first, an annular ring 205 having a portion to be the screw-shaped piece 204 is prepared and then 12B, the annular ring 205 is fixed in the mold of the oil seal 200, the rubber-like elastic material 201 is vulcanized and molded, and then the cutting line is formed. Unnecessary part 211 along 210
Is a method of cutting.

However, in the method of integrally joining the rubber-like elastic material 201 and the screw-shaped piece 204 made of a harder material in such a mold of the oil seal 200, a special mold of the oil seal 200 is used. Preparations such as the need for a dedicated mold for manufacturing the ring-shaped ring 205 and the like are required, and the manufacturing preparation cost tends to increase. Further, there is a problem that the molded rubber wraps around the screw-shaped piece 204 and the screw-shaped piece 204 is buried, and post-processing such as burr processing and cutting of the unnecessary portion 211 is required.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a sealing member serving as a sealing contact surface of a sealing device with various shaped lip of each sealing device. A method of manufacturing a seal member made of a composite material that can be used for the tip end in general, and a post-treatment such as a burr treatment of the lip tip end and a cutting of the unnecessary portion 211 by using the composite material for the seal member. It is to provide an unnecessary sealing device.

[0016]

In order to achieve the above object, according to the present invention, a plurality of types of sheet materials having different materials are laminated in a corrugated plate shape, and at least one surface is provided with a plurality of types having different materials. The sealing contact surface is formed by scraping off so that the sheet material of FIG.

Further, the roll-shaped member includes a rotating roll-shaped member and a corrugating member having a corrugated surface facing the surface of the roll-shaped member, and the first sheet material is wound around the surface of the roll-shaped member. The corrugated member is pressed at regular intervals in accordance with the rotation of the first sheet material to make the surface of the first sheet material uneven, and further, the second sheet material of different material is wound around the surface of the first sheet material. , The second sheet material surface is made uneven by pressing the corrugating member at regular intervals so as to fit with the unevenness previously formed as the roll member rotates, and By repeating the process repeatedly, a plurality of sheet materials of different materials are laminated in a corrugated plate to form an annular seal member, and at least one side of the inner side or the outer side is formed so that the plurality of sheet materials of different materials appear. Forming an annular sealing contact surface by taking Ri.

However, the corrugating member is a rotating member having at least one set of uneven portions in a cross-sectional shape, and the uneven portions are formed at regular intervals corresponding to the movement of the outer peripheral surface due to the rotation of the roll-shaped member. While rotating to face,
It is also preferable that the distance from the roll-shaped member can be adjusted according to the thickness of the sheet material to be laminated.

It is also preferable to use a sheet material made of a resin material and a sheet material made of a rubber-like elastic material as a plurality of types of sheet materials of different materials.

The joining of the laminated sheet materials may be characterized by interfacial joining by vulcanization.

It is also preferable that the sealing contact surface and the annular sealing contact surface have the shape of a lip tip portion that abuts on a sliding surface of a mating member of the sealing device. The sealing member is a sliding surface of the mating member of the sealing device. It is also preferable to equip the lip portion that abuts with.

[0022]

DETAILED DESCRIPTION OF THE INVENTION

(Embodiment 1) A method for manufacturing a seal member according to the present invention will be described below with reference to the illustrated embodiment.

1A, 1B and 2A,
(B) is a schematic representation of the manufacturing method of the seal member as the first embodiment.

Reference numeral 1 is a roll-shaped member which rotates in the direction of arrow A1. Reference numeral 2 denotes a corrugating member which faces the outer peripheral surface of the roll-shaped member 1 and rotates in parallel, and has a substantially triangular cross-sectional shape in this embodiment.

First, as shown in FIG. 1A, the roll-shaped member 1
The first sheet material S1 is wound around the outer peripheral surface of the. Next, in FIG. 1B, the roll-shaped member 1 is rotated in the direction of arrow A1 at a constant speed, and the corrugating member 2 is moved in the direction of arrow A2 in accordance with this speed.
The waveform W is formed on the surface of the first sheet material S1 which is pressed and wound while being rotated in the direction. FIG. 2 is an enlarged view of the corrugated state of the first sheet material S1.
It is (a).

Next, the second sheet material S2 is wound around the surface of the first sheet material S1, and the second corrugating member 2 is used to fit the corrugated W on the surface of the first sheet material S1. The corrugation of the sheet material S2 is performed (FIG. 2B). At this time, when the axial distance of the corrugating member 2 from the roll-shaped member 1 is D ₁ when the corrugation of the first sheet material S1 is formed, when the corrugated W of the second sheet material S2 is formed, Is the distance between the axes D
_By setting ₁ + t ₂ , it becomes possible to form a clean corrugation with little change in thickness on the second sheet material S2 of the second layer. Here, t ₂ is the thickness of the second sheet material S2.

This laminating process is repeated a plurality of times to form an annular seal member in which the first sheet material S1 and the second sheet material S2 are laminated in a corrugated plate shape to a predetermined thickness. The sheet members may be joined together by applying an adhesive to the joining surfaces, but if one sheet member is made of a rubber-like elastic material, it may be added after laminating. Interfacial bonding with the other sheet material can also be performed by performing vulcanization.

FIG. 3 (a) shows the annular seal member 10 extracted from the roll-shaped member 1. This ring-shaped seal member 10 is cut and sliced with a scalpel 3 to obtain
The annular seal member 11 is provided with the shape of the lip portion of the oil seal as shown in (b) and (c). By cutting with the knife 3, the first sheet material S1 and the second sheet material S2 appear alternately on the lip tip 11a and the lip inclined surfaces 11b and 11c which are the inner diameter side surface.

(Embodiment 2) In a manufacturing method of forming an annular seal member in which a first sheet material S1 and a second sheet material S2 are laminated in a corrugated plate shape to a predetermined thickness, Although the roll-shaped member having a smooth surface was used, as shown in FIG. 4, it is also possible to use a roll-shaped member 1a having a corrugated surface. In particular,
When the laminated sheet material is thin, it is difficult to form a clean corrugated sheet shape from the first layer to the outer peripheral surface. Even in such a case, the change in sheet material thickness due to the formation of the corrugated sheet shape from the first layer Can be suppressed.

Further, as shown in FIG. 5, a plurality of sheet materials, in this embodiment, the first sheet material S1 and the second sheet material S1 are used.
By stacking the sheet material S2 of 1 above and winding it around the roll-shaped member 1 and simultaneously corrugating it with the corrugating member 2, it is possible to continuously wind up a plurality of sheet materials until a predetermined thickness is obtained, Productivity can be improved.

(Third Embodiment) FIG. 6 is a cross-sectional explanatory view of a main part showing a state in which the seal member manufactured according to the first and second embodiments is applied to an oil seal 20 as a sealing device. The sliding member is provided with the seal member 11 described above.

The oil seal 20 is fixed to a housing member (not shown) by a reinforcing ring 21, and a seal lip 22 made of a rubber-like elastic material is provided on the inner diameter side of the reinforcing ring 21. Further, the seal lip 22 has a fixing surface 22a for fixing the seal member 11 which is the tip of the lip, and the seal member 11 is fixed by adhesion or the like.

FIG. 7 is a sectional view taken along line C _{2 of} FIG. 6 for explaining the state of the sliding portion between the oil seal 20 and the shaft 15.
A plurality of types of seal members 11 having different materials (S1, S2)
Sheet materials are laminated in a corrugated plate shape, and sheet materials S1 and S2 alternately appear in the circumferential direction at the lip tip 11a which is a sealing contact surface.

FIGS. 8A, 8B and 8C show variations of the oil seals 30, 40 and 50 using the seal member of the present invention. 8 (a),
In (b), seal lips 32, 42 made of rubber-like elastic material are formed on the reinforcing rings 31, 41, and seal members 33, 43 are fixed to the lip tips of the seal lips 32, 42. 8 (b) has a structure in which a spring spring 44 urges the sliding surface.

The oil seal 50 shown in FIG. 8 (c) is
The seal member 52 is directly attached by providing a mounting portion 51a that allows the seal member 52 to be directly attached to the inner diameter side of the metallic reinforcing ring 51. In this embodiment, the reinforcing ring 51 is made to have a spring property to exert a tightening force, and at the same time, the seal member 52 is supported so as to follow the eccentricity of the shaft.

As described above, when the seal member is applied to the oil seal as the sealing device, it can be applied in various forms, and the seal member may be attached as the lip tip of the seal lip. It does not matter, and the sealing member itself can be used as a sealing lip in the sealing device. Also, the shape of the oil seal has been described as an example of an annular shape, but for the one that seals a flat surface, it can be applied by using a seal member having a flat sealing contact surface. A combined seal member may be formed.

The sheet material constituting the seal member is
There are two types, S1 and S2, for the sake of simplicity.
It is also included in the present invention to stack more types of sheet materials, and depending on the required quality characteristics, not only a combination of a resin material and a rubber-like elastic material,
It is also possible to employ a combination of resin materials and resin materials, or a combination of rubber-like elastic materials and rubber-like elastic materials.

[0038]

EXAMPLE An example will be described in which two kinds of sheet materials S1 (rubber layers) and sheet materials S2 (resin layers) are alternately stacked to form a seal member.

Table 1 is a composition table of the sheet material S1 (rubber layer) and the sheet material S2 (resin layer).
The sheet material S2 (resin layer) having a thickness of 16 mm is made into a sheet material having a thickness of 0.12 mm and is laminated in a wave shape.

[0040]

[Table 1] In Table 1, the anti-oxidant RD is an anti-aging agent RD (antigen RD-G), and the chemical substance name is 2.2.4-trimethyl-1.2 dihydroquinone.

Antioxidant 3C is an antiaging agent 3C (antioxidant 3C), and the chemical substance name is N-isopropyl-N-fanyl-p-phenylenediamine.

The chemical substance name of the plastic material DOP is dioctyl phthalate.

The accelerator TT is the accelerator TT (Axel TMT
-R), and the chemical substance name is tetramethyl sulfide.

The accelerator CZ is the accelerator CZ (Axel CZ).
And the chemical substance name is N-cyclohexyl-2-benzothiazol sulfenamide.

Table 2 is a table summarizing the experimental results for confirming the effects of the invention. The oil seals of the same shape have the developed product equipped with the seal member of the present invention and the current product (NBR) which has been conventionally used. Used for the seal lip) and
The characteristics of both are compared.

[0046]

[Table 2] When the velocity V and the surface pressure P and the PV value obtained by multiplying the velocity and the surface pressure are the same, the wear amount is reduced to about 60% and the dynamic friction coefficient is reduced to 1/3.

FIG. 9 shows the result of comparing the stability of the sealing performance with respect to the lip wear width of the same developed product and the current product. It has a rotating shaft with a diameter of 45 mm and an inner diameter of 65 mm.
Is an oil seal that seals between the housings of the SAE, and the temperature of the SAE30W grade is 100
With respect to the oil at 0 ° C., the amount of oil leaking from the sliding surface per hour was measured as the sealing performance when the rotation speed of the shaft was kept constant at 2000 rpm.

The current product is shown as a white circle, and the developed product is shown as a black circle. The results are shown in FIG.
It was confirmed that the developed product had less change in sealing performance (oil leakage) due to lip wear width.

[0049]

EFFECTS OF THE INVENTION The present invention having the above-mentioned structure and operation makes it possible to manufacture a seal member in which a plurality of types of sheet materials alternately appear on the sealing contact surface, and the characteristic features of each sheet material are provided. A composite member can be obtained.

An annular seal member is formed by repeatedly winding a plurality of sheet materials around a roll-shaped member and molding the surface of the sheet material into an uneven shape by a corrugating member. At least one of the inner side and the outer side is formed. By scraping off the side, a sealing member having an annular sealing contact surface is obtained.

Since the corrugating member is a rotating member and the axial distance between the corrugated member and the roll-shaped member is adjusted according to the laminated thickness of the sheet material, the corrugated sheet material has little change in thickness and is clean. Can be corrugated.

By using a sheet material made of a resin material and a sheet material made of a rubber-like elastic material as the plurality of sheet materials of different materials, the laminated sheet materials can be joined by interfacial bonding by vulcanization molding. .

By providing the sealing member in the shape of the lip end portion of the sealing device and providing it on the lip portion of the sealing device, it is possible to easily manufacture the sealing device in which only the sliding surface that is involved in the sealing performance is made into a composite material. This sealing device does not generate burrs at the boundary of the composite member unlike the conventional sealing device of the method of integrally molding the composite member, and the lip portion needs to consider the fluidity of a plurality of fabrics. In addition, since the lip end portion which is a separate body is attached, the shape of the lip portion can be made simple. Therefore, the moldability of the sealing device main body side is good and easy, and the yield is also improved.

[Brief description of drawings]

FIG. 1 is an explanatory view of a method for manufacturing a seal member of the present invention.

FIG. 2 is an enlarged explanatory view of the method for manufacturing the seal member of the present invention.

FIG. 3 is an explanatory view of a state in which the seal member of the present invention is cut.

FIG. 4 is an explanatory view of another manufacturing method of the seal member of the present invention.

FIG. 5 is an explanatory view of another manufacturing method of the seal member of the present invention.

FIG. 6 is a cross-sectional explanatory view in which a sealing member is applied to a sealing device.

FIG. 7 is an enlarged explanatory view of a sliding surface of the sealing device of the present invention.

FIG. 8 is a variation of the sealing device of the present invention.

FIG. 9 is a diagram showing the sealing performance of the sealing device of the present invention.

FIG. 10 is a cross-sectional explanatory view of a conventional sealing device.

FIG. 11 is a sectional explanatory view of a conventional sealing device.

FIG. 12 is a diagram illustrating a method of manufacturing a conventional sealing device.

[Explanation of symbols]

1 roll-shaped member 2 corrugated member 3 female 10, 11 Seal member 11a Lip tip 20 oil seal 21 Reinforcement ring 22 seal lip S1, S2 sheet material

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-5-256371 (JP, A) JP-A-55-142165 (JP, A) JP-A2-168075 (JP, A) JP-A-2- 271166 (JP, A) JP 2-292578 (JP, A) JP 4-102769 (JP, A) Actual opening 6-69531 (JP, U) Actual opening 60-133270 (JP, U) Japanese Patent Publication 7-76588 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16J 15/32 311 B29D 31/00 F16J 15/453

Claims (7)

(57) [Claims] 1. A seal member for forming a sealing contact surface by laminating plural kinds of sheet materials of different materials in a corrugated plate shape and scraping off at least one surface so that plural kinds of sheet materials of different materials appear. Manufacturing method. 2. A rotating roll-shaped member, and a corrugating member having an uneven surface facing the surface of the roll-shaped member, wherein the first sheet material is wound around the surface of the roll-shaped member to form a roll-shaped member. The corrugated member is pressed at regular intervals in accordance with the rotation of the first sheet material to make the surface of the first sheet material uneven, and further, the second sheet material of different material is wound around the surface of the first sheet material. The surface of the second sheet material is made uneven by pressing the corrugating member at regular intervals so as to fit with the unevenness previously formed by the rotation of the roll-shaped member. By repeating the process repeatedly, multiple types of sheet materials of different materials are laminated in a corrugated plate to form an annular seal member, and at least one of the inner side and the outer side is machined so that multiple types of sheet materials of different materials appear. Method of manufacturing a sealing member forming an annular sealing contact surface by taking. 3. The corrugating member is a rotating member having at least one set of uneven portions in a cross-sectional shape, and the uneven portions are formed at regular intervals corresponding to the movement of the outer peripheral surface due to the rotation of the roll-shaped member. The method of manufacturing a seal member according to claim 2, wherein the seal member is rotated so as to face each other, and the distance from the roll-shaped member can be adjusted according to the laminated thickness of the sheet material. 4. The seal member according to claim 1, wherein a sheet material made of a resin material and a sheet material made of a rubber-like elastic material are used as the plurality of kinds of sheet materials made of different materials. Manufacturing method. 5. The method of manufacturing a seal member according to claim 4, wherein the joining of the laminated sheet materials is interfacial joining by vulcanization. 6. The sealing contact surface and the annular sealing contact surface are
The method for manufacturing a seal member according to claim 1, 2, 3, 4, or 5, wherein the lip tip portion is in contact with a sliding surface of a mating member of the sealing device. 7. A sealing device comprising a seal member manufactured by the manufacturing method according to claim 6 at a lip portion which comes into contact with a sliding surface of a mating member of the sealing device.