JP2006029373A - Method of manufacturing bonded piston seal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a bonded piston seal capable of reducing the use of adhesives, and omitting a lathe turning work which is very troublesome and costly, from a manufacturing process of the bonded piston seal having a metallic ring 2 and a seal 3. <P>SOLUTION: In this method of manufacturing the bonded piston seal 1 by baking and adhering the desired number of seals of rubber elastic material, to the metallic ring 2, the partial coating for applying the adhesives only to a part of the metallic ring 2 including an adhesion part 2A of the seals in baking and adhering the seals 3, is executed. Alternatively, the partial coating for applying the adhesives to the part including the adhesion part 2A and excluding a sliding part 2B, is executed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a bonded piston seal (including a bonded piston seal (BPS) used in an automatic transmission (AT) of a vehicle such as an automobile). .

  In general, a bonded piston seal has a metal ring that is hydraulically operated (reciprocating) inside an automatic transmission, and a rubber-made elastic seal that is baked and bonded to the metal ring to form a sealing action. In addition to the adhesion part where the rubber seal is baked and bonded to the metal ring, sliding sliding with a mating seal member (a seal member made of an O-ring, rubber lip, etc., which is mounted on the AT housing side) There is one in which a part is set (see Patent Document 1).

  Adhesive is used when the seal is baked and bonded to the metal ring, and since the adhesive also has a rust-preventing effect on the metal ring, it is generally applied by “all immersion”. The adhesive is applied to the entire surface of the ring exposed surface other than the bonding site.

  On the other hand, however, it is necessary for the bonded piston seal to suppress the variation (unstable) of the frictional resistance caused by sliding with the mating seal member from the viewpoint of emphasizing the operation characteristics, and therefore causes variation. The process of removing the adhesive applied to the sliding part is performed as part of the manufacturing process.

  This adhesive removal step is specifically performed as a turning process, and as a processing requirement thereof, a small surface roughness is required to suppress wear of the mating seal member, and the contact state of the mating seal member Since high dimensional accuracy is required to suppress variation in (contact tightening allowance), there is a problem that a lot of labor is required for processing and the processing cost is higher than usual.

  This turning process is performed in the final step after the adhesive application baking process and the vulcanization molding (rubber baking) process. Since cleaning and the like are indispensable and inspection for quality confirmation is also required, there is a problem that more labor is required and the cost is increased.

  For the bonded piston seal, in addition to the above-described type in which the adhesion part and the sliding part are set in the metal ring (see Patent Document 1), the type in which the adhesion part is set on the inner and outer circumferences of the metal ring (metal ring). A type in which the seal is baked and bonded to the inner and outer circumferences of the metal ring (see Patent Document 2), and a type in which an adhesion site is set only on one of the inner and outer circumferences of the metal ring (the seal is baked and bonded to one of the inner and outer circumferences of the metal ring and the other There is a type that does not set the sliding part (this type is often used as a canceller seal in particular: see Patent Document 3), etc., but when applying an adhesive to a metal ring regardless of the type If the total immersion is performed, the amount of adhesive used is large, and organic solvents are used in most adhesives. Therefore, there is a concern that environmental problems may be caused by the diffusion.

JP 2002-139155 A JP 2003-56717 A JP-A-11-257374

  In view of the above points, the present invention has an object to provide a method for manufacturing a bonded piston seal that can reduce the amount of adhesive to be used and can contribute to environmental conservation. In addition, it is possible to omit a lot of labor and costly turning from the manufacturing process of the bonded piston seal having the metal ring and the seal. It is an object of the present invention to provide a method for manufacturing a bonded piston seal that can be eliminated.

  In order to achieve the above object, a bonded piston seal manufacturing method according to claim 1 of the present invention is a bonded piston seal manufacturing method in which a required number of rubber-like elastic seals are baked and bonded to a metal ring. When the seal is baked and bonded, partial application is performed in which an adhesive is applied only to a part of the metal ring including the bonded portion.

  According to a second aspect of the present invention, there is provided a bonded piston seal manufacturing method according to the first aspect of the present invention, wherein the metal ring is bonded to a bonding portion where the seal is baked and bonded, and the metal ring is connected to the mating seal member. A sliding part that slides is set, and when the seal is baked and adhered, partial application is performed by applying an adhesive to a part other than the sliding part including the adhesive part. is there.

  In the manufacturing method according to claim 1 of the present invention having the above-described configuration, when the seal is baked and bonded, partial application in which an adhesive is applied to only a part of the metal ring including the bonded portion is performed. The amount of adhesive used (applied amount) can be reduced by the amount of application area reduced compared to the case of full immersion.

  In addition, in the above prior art, a large amount of labor and costly turning was required because the adhesive was also applied to the sliding portion of the metal ring. On the other hand, according to the manufacturing method according to claim 2 of the present invention, the partial application of applying the adhesive to the portion other than the sliding portion including the bonding portion is performed. The adhesive to be removed is not applied to the sliding part from the beginning.

  The present invention has the following effects.

  That is, by performing the partial coating according to the present invention, the following effects are brought about with respect to the problems of the prior art.

  That is, first, in the manufacturing method according to claim 1 of the present invention, since the partial application in which the adhesive is applied to only a part of the metal ring including the adhesion site is performed, it is applied as compared with the case of the conventional full immersion. Since the area is reduced, the amount of adhesive used can be reduced, and thus the amount of organic solvent released into the atmosphere can be reduced. Therefore, the manufacturing method of the bonded piston seal which can contribute to environmental conservation can be provided as intended.

  In addition, since the adhesive layer generally has a maximum thickness of about 30 μm, the thickness tolerance of the bonded piston as a whole varies depending on the thickness. Therefore, the tolerance may affect the spacing with the mating member, and by using partial adhesion this time, the dimensional tolerance of the metal ring becomes the dimensional tolerance of the part, so the ease of product design and the dimensional stability of the product It is possible to effectively prevent interference with the counterpart member.

  In addition to this, in the manufacturing method according to claim 2 of the present invention, the adhesive to be removed is applied to the metal ring since the partial application of applying the adhesive to the part other than the sliding part including the adhesive part is performed. Thus, it is not applied to the sliding portion from the beginning, and therefore, it is possible to omit the costly turning process in the process after the rubber vulcanization molding and to greatly reduce the processing cost. Note that the surface roughness and dimensional accuracy requirements of the sliding part can be achieved by manufacturing the metal ring by sheet metal press molding, and the maximum effect is brought about by completely eliminating the turning process. It is.

  In addition, by making the metal ring into a press-molded product by eliminating turning by performing partial coating, it becomes possible to use a press drawing surface having a good roughness form as a seal sliding surface. There is an advantage that the wear characteristics of the member can be improved. In other words, the turning surface is prone to fine burrs and burrs on the cutting edge, etc., and has a rough form with sharp peaks on the roughness waveform, so the rubber seal surface is attacked and worn. It tends to be easy to do. On the other hand, the press-drawn surface has a merit that seal wear can be reduced since the sharp peak of the upward convex is crushed and flattened.

  In addition, when the above-described sheet metal press molding cannot be used, turning is performed immediately after the ring is formed. Even in this case, since the processing is performed in a state where the adhesive is not baked, the cost is reduced. Can be suppressed. In this case, turning of the seal sliding part can be performed in the same chuck condition by adding a turning part in the turning process for dimensional correction that is usually performed immediately after the ring is manufactured. And the set can be omitted. For this reason, compared with the turning process after the rubber vulcanization molding step, which is a single step, it is less time-consuming and the cost can be reduced.

  The present invention includes the following embodiments.

  Compared to the conventional technology in which the metal ring is "immersed completely" and the adhesive is applied to the entire surface of the metal ring, "partial application" is performed to apply and bake the adhesive only to the metal ring part where the rubber is baked. To do. The partial application range may be set to a sufficiently covering range based on the rubber baking range or more, and may be a range that does not adhere to the sliding portion. As a method for partially applying the adhesive, a spray method using a precision nozzle is suitable, but other methods such as a capacitance type application can also be achieved. When “partial application” of adhesive is performed in this way, the sliding part is not covered with the adhesive from the beginning, so there is no need to turn the seal sliding part in the process after rubber vulcanization molding, which greatly increases the cost. Can be reduced.

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

  FIG. 1 shows a cross section of a main part of a bonded piston seal 1 manufactured by a manufacturing method according to an embodiment of the present invention.

  The bonded piston seal 1 is incorporated in the AT housing 4 together with a clutch plate, a return spring, etc. (not shown), and has a metal ring 2 that operates as a piston that presses the clutch plate by hydraulic operation. In order to seal the outer peripheral side of the metal ring 2, a rubber lip 3 that is a seal made of a rubber-like elastic material that is slidably in close contact with the inner surface of the AT housing 4 is baked and bonded to the outer peripheral portion of the surface of the metal ring 2. Further, in order to seal the inner peripheral side of the metal ring 2, the metal ring 2 is configured to slide with an O-ring 5 which is a mating seal member attached to the AT housing 4. Accordingly, the metal ring 2 is provided with an adhesion part 2A for baking and adhering the rubber lip 3 and a sliding part 2B for sliding with the O-ring 4. In the illustrated example, the metal ring 2 The outer peripheral shoulder portion from the end surface portion 2a to the outer peripheral cylindrical portion 2b is an adhesion portion 2A, and the inner peripheral surface of the inner peripheral cylindrical portion 2c of the metal ring 2 is a sliding portion 2B. The metal ring 2 is manufactured in the cross-sectional shape shown in the drawing by sheet metal pressing.

  When the rubber lip 3 is baked and bonded to the metal ring 2, a “partial application” is performed in which the adhesive is applied to only a part of the surface of the metal ring 2, and the “partial application” is performed. The adhesive is applied only to a portion other than the sliding portion 2B including the bonding portion 2A (a portion including the bonding portion 2A and not including the sliding portion 2B). In the example shown in the drawing, the adhesive is applied in an annular shape only to this portion over the adhesion site 2A, that is, the range from the point C to the point D in the drawing.

  Therefore, the amount of adhesive used can be reduced by carrying out “partial application” in this way, and since the adhesive to be removed is not applied to the sliding portion 2B of the metal ring 2 from the beginning, It is possible to omit a lot of labor and costly turning in the process after rubber vulcanization molding. Therefore, it is possible to greatly reduce the labor and cost of machining, and it is possible to solve all other problems that occur with the implementation of turning.

  In addition, in what provided the seal | sticker 3 in the inner and outer periphery, said adhesive agent application | coating is performed to each adhesion site | part 2A. That is, the bonded piston seal has a type (metal ring 2) in which the adhesion part 2A is set on the inner and outer circumferences of the metal ring 2 in addition to the type in which the adhesion part 2A and the sliding part 2B are set on the metal ring 2 described above. A type in which the seal 3 is baked and bonded to the inner and outer circumferences of the metal ring 2, and a type in which the bonding part 2A is set only on one of the inner and outer circumferences of the metal ring 2 (the seal 3 is baked and bonded to only one of the inner and outer circumferences of the metal ring 2 and On the other hand, there is a type in which no sliding part is set), and the present invention can be applied to these types. That is, in the case where the seals 3 are baked and bonded to the inner and outer peripheries of the metal ring 2, since the adhesion sites 2A are set on the inner and outer circumferences, a part of the surface of the metal ring 2 including the inner and outer adhesion sites 2A. A partial application is performed in which an adhesive is applied. In addition, in the case where the seal 3 is baked and bonded to only one of the inner and outer circumferences of the metal ring 2, since the bonding part 2A is set only on this one, the surface of the metal ring 2 including this one bonding part 2A Partial application is performed by applying an adhesive to the part.

Sectional drawing of the principal part of the bonded piston seal manufactured by the manufacturing method which concerns on the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bonded piston seal 2 Metal ring 2a End surface part 2b Outer peripheral cylinder part 2c Inner peripheral cylinder part 2A Adhesion part 2B Sliding part 3 Rubber lip (seal)
4 Housing 5 O-ring (mating seal member)

Claims (2)

In the manufacturing method of the bonded piston seal (1) formed by baking and bonding the required number of rubber-like elastic seals (3) to the metal ring (2),
When the seal (3) is baked and bonded, partial application in which an adhesive is applied to only a part of the metal ring (2) including the bonding site (2A) is performed. Method. In the manufacturing method of Claim 1,
The metal ring (2) is provided with an adhesion part (2A) for baking and adhering the seal (3) and a sliding part (2B) for sliding the metal ring (2) with the mating seal member (5). And
When the seal (3) is baked and bonded, partial bonding is performed by applying an adhesive to a portion other than the sliding portion (2B) including the bonding portion (2A). Method.

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