JP2015137729A5 - - Google Patents

Description

Manufacturing method of sealing device

The present invention relates to a method for producing a rubber-like elastic body made of dense sealing device for sealing an annular gap between two members.

In the case of a general cup seal, for example, a molded product having a non-product portion connected to the outer peripheral lip is molded, and a cut finish is performed by cutting the non-product portion and the gate remaining in the molded product from the molded product by cutting. . More specifically, the non-product portion is connected to the outer peripheral lip by flowing the rubber material into the cavity from the axial front end side of the inner peripheral lip and flowing the rubber material out of the outer peripheral lip in the axial direction. Mold the molded product. After that, the above-mentioned bracket is applied to the molded product.
Finishing is performed. By doing so, it is possible to prevent burrs or the like from remaining on the inner peripheral lip and the outer peripheral lip that affect the sealing performance.

However, when a groove is provided at the tip in the axial direction of the inner peripheral lip, the general manufacturing method as described above cannot be adopted. That is, the groove cannot be formed by the cut finish according to the above manufacturing method.

JP 2005-273714 A JP 2012-210905 A JP 2006-168429 A JP 2002-192571 A

An object of the present invention is to provide a manufacturing method of a sealing device that enables manufacturing of the sealing device by a manufacturing process equivalent to a general manufacturing method even when a groove is provided at the axial tip of the inner peripheral lip. There is.

  The present invention employs the following means in order to solve the above problems.

The manufacturing method of the sealing device of the present invention includes:
An inner peripheral lip that extends from the annular body part to one axial side and the inner circumferential side and seals at the inner circumferential side tip, and extends from the body part to one axial side and the outer circumferential side to the outer circumferential side tip. An outer peripheral lip to be sealed, and a method of manufacturing a sealing device made of a rubber-like elastic body in which a groove communicating from the inner side to the outer side in the radial direction is provided at the axial tip of the inner peripheral lip,
A molding step of molding using a mold having a cavity that forms the sealing device and a space portion that forms a non-product portion connected to the outer peripheral lip in the sealing device;
A removal step of removing the gate remaining from the molded article obtained by molding process in articles with non-product portion by cutting, in the manufacturing method of the dense sealing device that having a,
In the molding step, a rubber material is poured into the cavity from a position where the groove is not provided in the axial tip of the inner peripheral lip, and the cavity is filled with the rubber material, while the axial direction of the outer peripheral lip is filled. A molded product is formed by heating after pouring a rubber material into the space from a position where a tapered portion between the tip and the tip on the outer peripheral side of the outer peripheral lip is formed.

According to the present invention, after the rubber material is poured into the cavity from the position where the groove is not provided in the axial end of the inner peripheral lip, the molded product is molded, and then the gate remaining in the molded product is removed by cutting. doing. Thereby, the site | part in which a groove | channel is provided, and the site | part in which a groove | channel is not provided can be provided appropriately with respect to the front-end | tip of an inner peripheral lip .

As described above, according to the present invention, even when a groove is provided at the tip in the axial direction of the inner peripheral lip, the sealing device can be manufactured by a manufacturing process equivalent to a general manufacturing method.

FIG. 1 is a side view of a sealing device according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a sealing device according to an embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of a sealing device according to an embodiment of the present invention. FIG. 4 is a schematic cross-sectional view showing a state in use of the sealing device according to the embodiment of the present invention. FIG. 5 is an explanatory view illustrating a molding process in the method for manufacturing a sealing device according to the embodiment of the present invention. FIG. 6 is an explanatory view illustrating a molding process in the method for manufacturing a sealing device according to the embodiment of the present invention. FIG. 7 is an explanatory view for explaining a removing step in the method for manufacturing the sealing device according to the embodiment of the present invention. FIG. 8 is an explanatory view for explaining a removing step in the method for manufacturing the sealing device according to the embodiment of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

(Example)
With reference to FIGS. 1-8, the sealing device which concerns on the Example of this invention and the manufacturing method of a sealing device are demonstrated. In this embodiment, the case where the sealing device is used as a cup seal made of a rubber-like elastic body provided in the master cylinder will be described as an example. Therefore, in this embodiment, the annular gap between the two members (the piston and the cylinder that reciprocally moves relative to each other) in the master cylinder is sealed by the sealing device. In the following description, “axial direction” means a central axial direction in a piston or a sealing device.

<Sealing device>
The sealing device according to the present embodiment will be described with reference to FIGS. FIG. 1 is a side view (seen in the axial direction) of a sealing device according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a sealing device according to an embodiment of the present invention. 2 is a cross-sectional view taken along AA in FIG. FIG. 3 is a schematic cross-sectional view of a sealing device according to an embodiment of the present invention. 3 is a cross-sectional view taken along the line BB in FIG. FIG. 4 is a schematic cross-sectional view showing a state in use of the sealing device according to the embodiment of the present invention. The sealing device in FIG. 4 is a BB cross-sectional view in FIG.

  The sealing device 100 according to the present embodiment includes an annular body portion 130, an inner peripheral lip 110, and an outer peripheral lip 120. The inner peripheral lip 110 is configured to extend from the body portion 130 to one axial side and the inner peripheral side. The inner peripheral lip 110 has a sealing function when the inner peripheral tip 112 is in close contact with the piston 200. Further, the outer peripheral lip 120 is configured to extend from the body portion 130 to one axial side and the outer peripheral side. The outer peripheral lip 120 has an outer peripheral end 122 that is brought into close contact with the cylinder 300 to provide a sealing function.

Also, in the axial direction of the distal end of the inner circumferential lip 110, a groove 111 communicating with the outside it is provided from the inside in the radial direction. Contact name in this embodiment, the groove 111 is provided at three locations at equal intervals in the circumferential direction.

<State when using sealing device>
In particular, with reference to FIG. 4, the state at the time of use of the sealing device 100 which concerns on a present Example is demonstrated. The sealing device 100 is mounted in an annular groove 310 provided in the cylinder 300. Then, the inner peripheral side tip 112 of the inner peripheral lip 110 in the sealing device 100 is in close contact with the outer peripheral surface of the piston 200, and the outer peripheral side tip 122 of the outer peripheral lip 120 is in close contact with the groove bottom surface of the annular groove 310. Thereby, the annular gap between the piston 200 and the cylinder 300 is sealed by the sealing device 100. The sealing device 100 is mounted in the annular groove 310 so that the inner peripheral lip 110 and the outer peripheral lip 120 side face the pressure chamber P side, and the body part 130 side faces the flow path R side leading to the reservoir tank.

<Manufacturing method of sealing device>
In the case of a general cup seal, for example, a molded product having a non-product portion connected to the outer peripheral lip is molded, and a cut finish is performed by cutting the non-product portion and the gate remaining in the molded product from the molded product by cutting. . More specifically, the non-product portion is connected to the outer peripheral lip by flowing the rubber material into the cavity from the axial front end side of the inner peripheral lip and flowing the rubber material out of the outer peripheral lip in the axial direction. Mold the molded product. Thereafter, the cut finish described above is performed on the molded product. By doing so, it is possible to prevent burrs or the like from remaining on the inner peripheral lip and the outer peripheral lip that affect the sealing performance.

However, in the case of the sealing device 100 according to this embodiment, in the axial direction of the previous end of the inner circumferential lip 110, the groove 11 1 is provided. Therefore, the general manufacturing method as described above cannot be adopted. That is, in the cutting finishing by the manufacturing method described above, it is impossible to form a groove 11 1. Therefore, a method for manufacturing the sealing device 100 according to the present embodiment by a manufacturing process equivalent to a general manufacturing method will be described below.

  With reference to FIGS. 5-8, the manufacturing method of the sealing device 100 which concerns on a present Example is demonstrated. 5 and 6 are explanatory views for explaining a molding step in the method for manufacturing a sealing device according to the embodiment of the present invention. 5 and 6 show a part of the mold in cross section, FIG. 5 shows a part for forming the AA cross section in FIG. 1, and FIG. 6 forms the BB cross section in FIG. The part to do is shown. 7 and 8 are explanatory views for explaining a removing step (cut finishing step) in the method for manufacturing a sealing device according to the embodiment of the present invention. 7 and 8 show a part of the molded product in cross section. FIG. 7 corresponds to the AA cross section in FIG. 1, and FIG. 8 corresponds to the BB cross section in FIG.

<< Molding process >>
With reference to FIG.5 and FIG.6, a formation process is demonstrated. The mold used in the molding process according to the present embodiment includes a first mold 510, a second mold 520, and a third mold 530. 5 and 6 show a state where the mold is clamped. The mold forms a cavity C that forms the sealing device 100 that is a product, and a space portion 521 that forms a non-product portion connected to the outer peripheral lip 120 of the sealing device 100.

  In this embodiment, the rubber material is poured into the cavity C from a position where the groove 111 is not provided in the axial end of the inner peripheral lip 110 of the sealing device 100. That is, the mold in this embodiment employs a configuration in which a rubber material is caused to flow from the above position to the cavity C via the gate 512 as shown in FIG.

  In this embodiment, the cavity C is filled with the rubber material, and the space is formed from the position where the taper portion 123 between the axial tip of the outer peripheral lip 120 and the outer peripheral tip 122 of the outer peripheral lip 120 is formed. A rubber material is poured out into the portion 521. That is, in the mold in the present embodiment, as shown in FIG. 5, a configuration is adopted in which the rubber material is poured into the space portion 521 through the outflow passage 522 from the position where the tapered portion 123 of the outer peripheral lip 120 is formed. ing.

After the rubber material is filled into the cavity C and the space 521 with the mold configured as described above, the molded product is molded by heating.

<< Removal process (cut finishing process) >>
With reference to FIG.7 and FIG.8, a removal process (cut finishing process) is demonstrated. After the molded product obtained by the molding process is taken out from the mold, the non-product part 150 and the gate 140 remaining in the molded product are removed from the molded product by cutting. C1 in FIG. 7 indicates a cutting position for removing the gate 140. Moreover, C2 in FIG.7 and FIG.8 has shown the cutting position for removing the non-product part 150. FIG.

Of the axial end of the inner peripheral lip 110 in the sealing device 100, the groove 111 is formed by a mold (more specifically, the first mold 510). And the part connected with the gate 140 among the front-end | tips of the axial direction of the internal peripheral lip 110 does not remain a burr | flash by said cutting finish. Further, the tip in the axial direction of the outer peripheral lip 120 in the sealing device 100 is formed by a mold (more specifically, the first mold 510) .

  Regarding the formation of the outer peripheral lip 120, it is possible to eliminate the removal step without forming the non-product part 150. However, in this case, since the portion where the outer peripheral lip 120 is formed in the cavity C is the final joining location of the rubber material, another problem that molding defects are likely to occur frequently occurs.

<Excellent points of the production method of engaging Ru tight sealing apparatus of the present embodiment>
The sealing device 100 according to the present embodiment employs a configuration in which a groove 111 is provided at the axial end of the inner peripheral lip 110. Therefore, it is not possible to employ a conventional manufacturing method in which a cut finish is applied to the tip of the lip in the axial direction after the molded product is molded. However, by using the manufacturing method according to the above-described embodiment, the gate 140 on the inner peripheral lip 110 side and the non-product portion 150 on the outer peripheral lip 120 side are removed by cutting after the molded product is molded. The sealing device 100 can be manufactured by a manufacturing method.

DESCRIPTION OF SYMBOLS 100 Sealing device 110 Inner peripheral lip 111 Groove 112 Front end 120 Outer peripheral lip 122 Front end 123 Tapered part 130 Body part 131 End surface 140 Gate 150 Non-product part 200 Piston 300 Cylinder 310 Annular groove 311 Side wall surface 510 1st type 511 Sprue 512 Gate 520 Type 2 521 Space 522 Outflow channel 530 Type 3 C Cavity P Pressure chamber R Channel

Claims (1)

An inner peripheral lip that extends from the annular body part to one axial side and the inner circumferential side and seals at the inner circumferential side tip, and extends from the body part to one axial side and the outer circumferential side to the outer circumferential side tip. An outer peripheral lip to be sealed, and a method of manufacturing a sealing device made of a rubber-like elastic body in which a groove communicating from the inner side to the outer side in the radial direction is provided at the axial tip of the inner peripheral lip,
A molding step of molding using a mold having a cavity that forms the sealing device and a space portion that forms a non-product portion connected to the outer peripheral lip in the sealing device;
A removal step of removing the gate remaining from the molded article obtained by molding process in articles with non-product portion by cutting, in the manufacturing method of the dense sealing device that having a,
In the molding step, a rubber material is poured into the cavity from a position where the groove is not provided in the axial tip of the inner peripheral lip, and the cavity is filled with the rubber material, while the axial direction of the outer peripheral lip is filled. Manufacturing a sealing device characterized by molding a molded product by heating after pouring a rubber material into the space from a position where a tapered portion is formed between a tip and a tip on the outer peripheral side of the outer peripheral lip. Method.

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