JP2000266068A - Sealing material and manufacturing of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily, inexpensively massproduce the sealing materials by forming circular half-cut parts on an outer periphery of a central hole of a plate-shaped reinforcement member made of a rigid material, forming an adhesive layer on an annular part therebetween, integrating the same with a sealing annular elastic body in a mold, and separating the half-cut parts. SOLUTION: The half-cut parts 1b are formed on an outer periphery of a central hole 1a simultaneously with the formation of the central hole la on a rigid plate-shaped reinforcement member 1, an adhesive layer 3 is formed only an annular part 13 formed thereby, an elastic body 2 is molded and fixed thereto, and the half-cut parts 1b are separated to form a sealing member. On this occasion, the elastic body 2 is formed into the shape of a lip or the high contact shape, capable of exercising the maximum sealing function, and its outer peripheral part is performed into the shape capable of ensuring the effective shape after the separation of the half-cut parts 1b. The adhesive layer 3 applied and formed only on the annular part 13 permits the free molding of the elastic body 2, and an outside part of the half-cut parts 1b does not permit the fixing of the elastic body, whereby the half-cut parts can be easily separated without burring. That is, the cutting molding can be easily executed in safety, the structure of a mold can be simplified and the molding processs can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing material such as a bearing seal, a wheel seal or an oil seal and a method of manufacturing the same, and more specifically, a sealing material for a bearing which can be continuously mass-produced and a method of manufacturing the same. It is about.

[0002]

2. Description of the Related Art Conventionally, as a means for continuously forming a large number of sealing materials, a large number of sealing materials are formed at one time using a plurality of connected dies, or elastic members are directly formed on a belt-shaped or plate-shaped reinforcing member. A manufacturing method such as forming a body and punching the body is used, and various methods are selected according to required performance and shape. Among them, in a manufacturing method of directly forming an elastic body on a belt-shaped or flat reinforcing member, the following structure has been proposed and implemented in order to ensure sealing performance. More specifically, referring to the drawings, as shown in FIG. 7, an outer peripheral groove 1d having a center hole 1a and several connecting portions 1c is punched and formed in a belt-shaped or flat-plate-shaped reinforcing member 1, and an inner ring thereof is formed. As shown in FIG. 8, the sealing member 2 is formed with the elastic member 2 having a seal shape as shown in FIG. 8, and then the connecting portion 1 c is punched with a punch 4 or the like to form a sealing material including the annular portion 12 and the elastic member 2. Are known. (See, for example, JP-A-60-192117)

[0003]

However, the multi-cavity forming method using a plurality of connected molds has a number of disadvantages in terms of mold cost and maintenance because a large number of molds are required. Further, in the forming method of forming and punching the elastic body 2 between the inner and outer peripheral portions formed on the reinforcing member 1 shown in FIGS. For example, in the structure in which the elastic body 2 formed by projecting the outer peripheral portion of the annular portion 12 including the center hole 1a and the outer peripheral groove 1d is formed, the connecting portion 1c to be cut partially has the outer peripheral portion. There is a possibility that the sealing performance will be greatly reduced when the device is shut off and mounted on the bearing. In addition, there is a drawback that the yield of the reinforcing member 1 is deteriorated by the shaping of the outer circumferential groove 1d. In view of the above, the present invention has conceived a method that can be easily and inexpensively mass-produced by improving the configuration of the outer peripheral portion and the molding method.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a sealing member comprising an elastic sealing member for sealing a bearing portion and a reinforcing member for reinforcing the sealing member. As shown, a plate-shaped reinforcing member 1 made of a rigid material such as a metal material or a synthetic resin material is provided with a center hole 1a.
A circular semi-cut portion 1b is provided on the outer periphery of the center hole 1a, and as shown in FIGS.
After the adhesive layer 3 is formed on the annular portion 13 between
As shown in FIG. 5, it is characterized in that it is integrated with a seal ring-shaped elastic body 2 in a mold, and thereafter, the half cut portion 1b is formed to be separated.

[0005] A method of manufacturing a sealing material for sealing a bearing portion is provided. As shown in FIGS. 1 and 2, a central hole 1a is formed in a plate-like reinforcing member 1 made of a metal material or a synthetic resin material. At the same time, a circular semi-cut portion 1b is formed on the outer periphery of the center hole 1a, and is bonded to the annular portion 13 formed by the center hole 1a and the semi-cut portion 1b as shown in FIGS. After the agent layer 3 is applied and formed, it is integrated with the elastic body 2 formed into a seal ring shape in the mold as shown in FIG. 5, and thereafter, the half cut portion 1b is cut off and formed. I have.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is to form a sealing material continuously and simply by efficiently combining a punching means and a molding means with a sealing material. 1a, the semi-cut part 1
b, the adhesive layer 3 is formed only on the annular portion 13 formed by the center hole and the 1a half-cut portion 1b. After the elastic body 2 is molded and fixed to the adhesive layer 3, the half-cut is performed. The sealing material is formed by separating the portions 1b.

At this time, the inner and outer peripheral portions of the elastic body 2 are formed into a lip shape or a high-adhesion shape capable of maximizing a sealing function, and the semi-cut portion 1b is separated at the outer peripheral portion. A shaping that can secure an effective shape later is made in advance. It is the adhesive layer 3 that is applied and formed only on the annular portion 13 to form a free form of the elastic body, and a portion deviating from the half-cut portion 1b, that is, a portion outside the half-cut portion 1b is formed of the elastic body 2 It does not allow sticking and can be easily separated without generating burrs as shown in FIG.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One molding example of the present invention is described as follows.
Using a stainless steel plate having a thickness, a large number of center holes 1a having a diameter of 9.0 mm are punched out at the same time, and a half cut portion 1b having a diameter larger than the center hole 1a and 13 mm in diameter is cut in half (half blank). Next, after applying an adhesive to the inside of the half-cut (half blank) and baking,
Elastic body 2 in the form of multiple seals by compression molding, injection molding or pot molding
Is vulcanized and bonded. Then, a sealing material is obtained by using a jig. As the reinforcing member 1 used here, a steel plate, a stainless steel plate, an aluminum plate, or another alloy plate is used, and a phenol-based, nitrile-based, epoxy-based adhesive or the like can be used as an adhesive applied and formed on the steel plate. In the body 2, a synthetic resin material such as a thermoplastic resin or a synthetic rubber material such as NBR, SBR, CR, BR, IIR is appropriately adopted depending on required performance.

[0009]

According to the sealing material obtained by the present invention, not only the unnecessary waste portion of the reinforcing material is made non-adhesive in the molding of the outer peripheral portion to be fixed, but also the punching molding can be made easy and safe. Also, the degree of freedom has been increased in terms of molding, and the sealing performance has been dramatically improved. In addition, since the outer portion of the half-cut portion 1b can be used as a mold in the mold, the mold structure can be simplified and the molding process can be shortened. As a matter of course, the simplification of the mold structure can be realized even in the formation of a punch from the reinforcing member 1, and the molding speed can be increased. Thus, a large amount of sealing material can be easily and inexpensively molded.

[Brief description of the drawings]

FIG. 1 is a plan view showing a punching step of the present invention.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is a plan view showing an adhesive application step of the present invention.

FIG. 4 is a partially enlarged sectional view of FIG. 3;

FIG. 5 is a cross-sectional view showing a molding step of the present invention.

FIG. 6 is a cross-sectional view showing a step of pulling out the state of FIG.

FIG. 7 is a plan view showing a conventional punching intermediate process without using the present invention.

FIG. 8 is a cross-sectional view showing a punching step in an AA ′ cross section of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforcement member 1a Center hole 1b Half cut part 1c Connecting part 1d Outer peripheral groove 12 Annular part 13 Annular part 2 Elastic body 3 Adhesive layer 4 Punch

Claims (2)

[Claims] 1. A sealing material which is mounted on a bearing portion and seals the bearing portion, wherein a plate-shaped reinforcing member made of a metal material or a synthetic resin material is provided with a center hole and an outer periphery of the center hole. After forming an adhesive layer on an annular portion formed by the center hole and the half-cut portion, the half-cut portion is integrated with a seal ring-shaped elastic body in a mold. A sealing material, wherein a cut portion is formed to be separated. 2. A method of manufacturing a sealing material which is mounted on a bearing portion and seals the bearing portion, wherein a center hole is cut into a plate-like reinforcing member made of a metal material, a synthetic resin material, or the like. After forming a circular semi-cut portion on the outer periphery of the center hole and applying and forming an adhesive layer on an annular portion formed by the center hole and the semi-cut portion, a seal ring shape is formed in a mold. A method of manufacturing a sealing material, wherein the sealing material is integrated with an elastic body, and then the half-cut portion is cut off and formed.