JPH09273559A - Bearing seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a manufacturing cost by forming lip part projected from the circumferential rim of a reinforcing annulus formed of a reinforcing plate by the circumferential rim of an enclosed ring formed of an elastic sealing material by punching a laminated layer plate by a press punch. SOLUTION: A reinforcing plate 2 is deformed in a pressure direction by resistance force for making an elastic enclosing material formed on the reinforcing plate 2 flow in a horizontal direction, and the reinforcing plate 2 is plastically deformed along the recessed/projection shape of a forming die 1 so as to obtain a laminated layer plate (a) with the elastic enclosing material 3 valcanizingly integrated. After that, the laminated layer plate (a) is punched by a press punch so as to form a lip part projected, in a ring shape, from the circumferential rim of a reinforcing annulus formed of the reinforcing plate 2 by the circumferential rim of an enclosing ring formed of the elastic enclosing material 3. Recessed/projection molding is simultaneously carried out by a forming die 1 to the reinforcing plate 2 together with the elastic enclosing material 3 at the time of forming of a bearing seal, rigidity thereof is extremely improved by deforming molding, and also downsizing of a space is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing seal which can be continuously formed in a large amount and which does not require finishing treatment and is excellent in overall strength and sealing performance.

[0002]

DISCLOSURE OF THE INVENTION The present invention is a bearing seal which is attached to a bearing which rotates relative to each other and seals the bearing. The bearing seal is made of metal and is formed by applying an adhesive or the like to a mold (1) having a desired shape. A reinforcing plate (2) made of a thin plate is introduced, and the elastic sealing material (A3) in the form of cloth such as synthetic rubber or synthetic resin is pressure-molded, and the reinforcing plate is applied by the flow pressure of the elastic sealing material (A3). The unevenness is molded in (2) to obtain an integrated laminated plate (a), and then the laminated plate (a) is pressed with a press punch (4) having a desired diameter.
A lip portion (3b) that is punched out with a peripheral edge of a sealing ring (3a) formed of the elastic sealing material (3) and protrudes from a peripheral edge of a reinforcing ring (2a) formed of the reinforcing plate (2).
The present invention is characterized in that a bearing seal formed with is obtained.

[0003]

Problems to be Solved by the Invention JP-A-54-6888
The conventional simple punching type bearing seal shown in Japanese Patent Publication No. 2 has a large diameter due to its simple structure as shown in FIG. Since the bearing seal has a very small mounting space, it may interfere with the retainer (6) that holds the rolling body (5) in the bearing, and in order to avoid this interference, the meat of the portion that may be in contact with the retainer (6). It is necessary to form the pressure thinly (a pre-molding method can also be performed as a similar molding method) or to detour-form the interference portion into a convex shape to separate the two portions.

In manufacturing such a bearing seal, an elastic sealing material (3) is laminated on a flat reinforcing plate (2), and then a press punch (4) is formed as shown in FIG.
When a deformation stress is applied by punching with, the elastic sealing material (3) having high flexibility is formed on the reinforcing plate (2).
Since a deformation load is applied through it, it is not possible to perform compression molding of an accurate shape. Further, when the reinforcing plate (2) is preliminarily deformed and shaped, and then the elastic sealing material (A3) is laminated and formed, the reinforcing plate (2) is thermally expanded in the mold vulcanization of the elastic sealing material (A3) and the diameter thereof is increased. It has a structural defect that the pitch can be easily changed and cannot be placed accurately in the mold, which is one of the major reasons that the molding accuracy and sealing performance cannot be improved.

In view of the above drawbacks, the present invention provides a bearing seal which does not require pre-forming and is capable of deforming the reinforcing plate (2) on the molding die (1) at the same time by molding pressure at the time of molding, which is excellent in manufacturing cost. The purpose is to do.

[0006]

2. Description of the Related Art In recent years, a bearing seal mounted on a bearing has a resilient plate (2) made of metal or the like and an elastic sealing material (3) made of an elastic body formed on the reinforcing plate (2) as shown in FIG. A reinforcing ring (7) whose peripheral edge is formed by the reinforcing plate (2) by punching the elastic sealant (3) together with the reinforcing plate (2) with a press punch (4) at the same time.
A very simple punching type manufacturing method for obtaining a bearing seal having a lip portion (3b) projecting from the peripheral edge thereof has been carried out. (See JP-A-54-68882)

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention having the above-mentioned constitution has the following excellent effects. First, as shown in FIG. 1, a reinforcing plate (2), which has been subjected to surface treatment such as degreasing / adhesive coating on a thin metal plate, is prepared, and a synthetic rubber or synthetic resin or the like elastic sealing material (A3 ) And the reinforcing plate (2) is inserted into a mold (1) having concave and convex shapes. Then, as shown in FIG. 2, when this is pressure-molded, the reinforcing plate (2) is deformed in the pressing direction due to the resistance pressure for the elastic sealing material (A3) on the reinforcing plate (2) to flow laterally. Then, the reinforcing plate (2) is plastically deformed along the concavo-convex shape of the mold (1), and the elastic sealing material (3) is vulcanized and integrated to obtain a laminated plate (a). In addition, the reinforcing plate (2) is sandwiched between the molding die (1) in advance, and the elastic sealing material (A
There is also a method of injecting 3) and causing the reinforcing plate (2) to follow the uneven shape of the mold by the injection pressure. (Not shown.) After that, the laminated plate (a) is pressed by a press punch (4).
The elastic sealing material (3) is punched by utilizing the difference in the amount of compressive deformation and elastic repulsion force, and as shown in FIG. 3, the peripheral edge of the sealing ring (3a) formed from the elastic sealing material (3) is reinforced by the reinforcement. A bearing seal having a lip portion (3b) protruding in a ring shape from the peripheral edge of a reinforcing ring (2a) formed of a plate (2) is obtained.

As shown in FIG. 4, the bearing seal formed in this manner is accurately shaped to have a concave and convex shape, a diameter dimension, and a lip portion (3b) shape, and has high rigidity and excellent sealing performance. Will be

[0009]

EXAMPLES In carrying out the present invention, the reinforcing plate (2) is 0.0
In the shape formed from a thin metal plate having a plate thickness of 5 mm to 1.2 mm and compression-formed into the reinforcing plate (2),
Retainer (6) for rolling element (5) as shown in FIG.
In addition to the detour convex shape that does not interfere with the structure, the structure of FIG. 6 is mainly formed to improve its rigidity, or a shape having complex unevenness as shown in FIG. 7 or FIG. 8 for giving other action is formed. It is also possible. This will be described in detail. In FIG. 6, a ring-shaped convex portion (c1) is provided on the flat surface portion of the bearing seal to improve the strength of the entire peripheral surface. Further, in the concavo-convex shape shown in FIG. 7, the intermittent ridges (c2) are provided, and it is expected that the internal lubricating oil will be retained in the recesses on the back surface of the ridges (c2). In addition, the structure shown in FIG. 8 forms a wavy unevenness (c3) on the peripheral edge, and the resistance stirring action of the wavy unevenness (c3) causes a scattering / shaking effect of dust or water drops to be attached.

Next, in forming the elastic sealing material (3) of the laminated plate (a), as shown in FIG. 2, the elastic sealing material (A3) made of synthetic rubber or synthetic resin is used to form a mold. Since both the members (2) are deformed and shaped along with the reinforcing plate (2) in the molding die (1) along with the unevenness of the die by compression.
(3) closely adheres to eliminate molding defects such as defective flow of the elastic sealing material (A3) and defective adhesion. Of course, in the elastic sealing material (A3) used here, synthetic rubbers such as nitrile rubber or acrylic rubber or fluororubber, which are generally used as sealing materials, and synthetic resins, such as thermoplastic resin, are required to meet required performances. You can freely select it according to your needs.

[0011]

According to the present invention, at the time of molding a bearing seal, the elastic sealing material (A3) and the reinforcing plate (2) are simultaneously shaped by the molding die (1), and the rigidity is dramatically increased by the deformation molding. Along with this, space saving is realized. Since this bearing seal enables complex molding, even with the punching type molding method, it is not limited to the seal member of the minimum position such as the conventional miniature bearing, and a general large diameter bearing It has a high degree of freedom in molding that can handle even seals, and has achieved mass production at low cost.

[Brief description of drawings]

1 is a cross-sectional view showing an embodiment forming the present invention.

FIG. 2 is a sectional view showing a compressed state from FIG.

FIG. 3 is a cross-sectional view showing a formed state of the present invention.

FIG. 4 is a cross-sectional view showing a state in which a bearing seal is mounted.

FIG. 5 is a schematic cross-sectional view showing a conventional punching type molding method.

FIG. 6 is a perspective sectional view showing an embodiment formed according to the present invention.

FIG. 7 is a perspective sectional view showing another embodiment formed according to the present invention.

FIG. 8 is a perspective sectional view showing another embodiment formed according to the present invention.

[Explanation of symbols]

 1 Mold 2 Reinforcement Plate 3 Elastic Sealing Material 2a Reinforcing Ring 3a Sealing Ring 3b Lip Part 4 Press Punch 5 Rolling Body 6 Retainer 7 Reinforcement Ring A3 Elastic Sealing Material a Laminated Plate c1 Ring-shaped Convex c2 Intermittent Convex c3 Wavy unevenness

Claims (5)

[Claims] 1. In a bearing seal mounted on a bearing to seal the inside and outside of the bearing, a reinforcing plate made of a thin metal plate is put into a molding die having a desired shape, and the elastic sealing material is pressure-molded to form an elastic sealing material. A reinforcing plate is molded into a desired shape by fluid pressure to obtain a laminated plate including the integrated reinforcing plate and elastic sealing material, and then the laminated plate is punched with a press punch to form a sealing ring formed from the elastic sealing material. The bearing seal is characterized in that a peripheral edge of the reinforcing ring is formed with a lip portion projecting from the peripheral edge of the reinforcing ring. 2. The thin metal plate forming the reinforcing plate,
The bearing seal according to claim 1, which has a plate thickness of 0.05 mm to 1.2 mm. 3. In the laminated plate forming the bearing seal, a reinforcing plate made of a thin metal plate is put into a forming die, pressure-molded together with an elastic sealing material, and a flat portion of the reinforcing plate is generated by a flow pressure of the elastic sealing material. 3. The bearing seal according to claim 1, wherein a herring-shaped convex portion is provided. 4. In the laminated plate forming the bearing seal, a reinforcing plate made of a thin metal plate is put into a molding die, pressure-molded together with an elastic sealing material, and a flat portion of the reinforcing plate is generated by a flow pressure of the elastic sealing material. 3. The bearing seal according to claim 1, further comprising a protruding strip that is intermittent in a herring shape. 5. In the laminated plate forming the bearing seal, a reinforcing plate made of a thin metal plate is put into a molding die, pressure-molded together with the elastic sealing material, and the peripheral pressure of the reinforcing plate is applied by the flow pressure of the elastic sealing material. 3. The bearing seal according to claim 1, wherein wavy unevenness is provided.