JPH0988980A - Seal for bearing and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it suitably usable for a small-sized bearing, capable of preventing any camber in a seal itself and deformation in a bearing outer ring, etc., and also of hermetically sealing a bearing as ranging from the bearing outer ring to the inner ring accurately as well as to aim at an improvements in production efficiency and a reduction in manufacturing cost. SOLUTION: This bearing seal is constituted with a ring laminated plate 20, where an elastic coating layer 22 consisting of an elastic member is formed on one surface of a ring metal core plate 21 and an inner circumferential edge part of a core plate through hole 21a, and an outer circumferential edge part is bent to the other face side and thereby a rising-form edge bending part 30 is formed there. In a state of being attached to a bearing 1, the core plate 21 of the edge bending part 30 is forcibly pressed to an outer ring 1a by dint of elastic repulsion, whereby the elastic coating layer 22 in and around the edge bending part 30 is stuck close to an inner circumferential step part 1f formed in the outer ring 1a, while the elastic coating layer 22 of the through hole peripheral edge part is also stuck close to a bearing inner ring 1b, and thus this bearing seal is constituted to function as a seal lip in terms of structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing seal to be mounted in an annular opening between inner and outer rings of a bearing and a method for manufacturing the same, and particularly to a bearing that can be suitably used for small size bearings such as miniature bearings. The present invention relates to a seal and a manufacturing method thereof.

[0002]

2. Description of the Related Art As shown in FIGS. 15 to 17, in a hermetically sealed rolling bearing (1), an annular opening (1c) between an outer ring (1a) and an inner ring (1b) is replaced by an annular bearing seal. It may be sealed according to (2).

There are many types of such bearing seals, but the small size bearing seal (2) to be mounted on a small diameter bearing (1) such as a miniature bearing is mainly made of a metal plate. This type of seal (2) is generally manufactured by punching a metal plate in an annular shape and bending the outer peripheral edge of the annular metal plate to form a rising edge bent portion (2a). .

The seal (2) is crimped to the inner circumferential groove (1d) of the outer ring (1a) as shown in the solid line in FIG. It is fitted in a pressed state and mounted on the bearing (1).

[0005]

However, in the above-mentioned conventional bearing seal (2), when the edge bending portion (2a) is caulked and fitted into the inner peripheral groove (1d) of the outer ring (1a), the caulking process is performed. The accompanying strong force is applied to the outer ring (1a) to deform the outer ring (1a), which causes a problem that the dimensional accuracy of the outer ring (1a), for example, the roundness, deteriorates and the quality deteriorates. Further, the caulking of the metal may generate fine iron powder, which may be mixed as a foreign substance to cause a problem such as an acoustic problem. In addition, the metal seal (2) does not have sufficient adhesion to the outer ring (1a) and cannot reliably prevent grease leakage between the seal (2) and the outer ring (1a), and also the seal (2). Cannot contact the inner ring (1b), and there is a problem that the sealability between the seal (2) and the inner ring (1b) is poor.

On the other hand, as a relatively large size bearing seal, there is known one in which a coating layer made of an elastic member is formed on an annular metal core plate.

In this bearing seal, an outer peripheral seal portion made of an elastic member is formed on the outer periphery, and the outer peripheral seal portion is fitted and fixed in the inner peripheral groove of the bearing outer ring in a compressed state. With this seal, the outer peripheral seal portion sufficiently adheres to the bearing outer ring, and grease leakage between the seal and the outer ring can be reliably prevented. Moreover, it is possible to form an inner peripheral seal portion made of an elastic member also on the inner periphery of the central through hole.
By bringing this inner peripheral seal part into close contact with the bearing inner ring,
The part can be reliably sealed.

However, in order to manufacture this bearing seal, in addition to a punching step and a bending step for obtaining an annular core plate, the core plates are arranged in a mold and vulcanized and compression molded to form an elastic coating layer. There is a problem in that a large number of steps are required, such as a step, and a step of removing an excessive elastic portion (burr), which lowers production efficiency and causes an increase in cost. Above all, in vulcanization compression molding, the work of arranging the core plates in the mold with high positional accuracy or carefully tearing out fine burrs requires a great deal of labor and an enormous amount of time. The work load increases, and when manufacturing a small-sized seal for a miniature bearing or the like, there arises a problem that production efficiency is further reduced and cost is increased.

As a seal for a miniature bearing,
Some are made of synthetic resin. This seal can be manufactured efficiently by the well-known injection molding process.
Due to the thermal creep phenomenon of the resin due to the temperature rise during the rotation of the bearing, harmful warpage or the like occurs, sealing becomes insufficient, and grease leakage or the like occurs.

The present invention solves the above-mentioned problems of the prior art and can be preferably used for small-sized bearings, and can reliably prevent defects such as warpage of the seal itself and deformation of the bearing outer ring, and also from the bearing outer ring to the inner ring. It is an object of the present invention to provide a bearing seal that can be reliably sealed over a period of time, and that is capable of improving production efficiency and reducing costs, and a method of manufacturing the same.

[0011]

In order to achieve the above object, the first invention of the present application is a bearing seal to be mounted on an annular open portion between inner and outer rings of a bearing, which comprises an annular metal core plate. At least one surface and an inner peripheral edge portion of the through hole in the center of the core plate are formed of an annular laminated plate having an elastic coating layer made of an elastic member, and the outer peripheral edge portion is bent to the other surface side to form an edge bend portion. In the state of being mounted on the bearing, the edge bending portion is pressed against the bearing outer ring by the elastic repulsive force of the core plate, and the elastic coating layer near the edge bending portion is formed on the inner peripheral step portion formed on the bearing outer ring. The gist of the invention is that the elastic coating layer on the inner peripheral edge of the through-hole is in close contact with the inner ring of the bearing.

The bearing seal of the first invention can be manufactured, for example, by the manufacturing method of the second invention of the present application. That is, the second aspect of the present invention is a method of manufacturing a bearing seal that is mounted in an annular opening between the inner and outer rings of a bearing, in which a central portion of a seal forming position of a metal plate is punched to form a through hole. A first hole forming step; a coating layer forming step of forming an elastic coating layer made of an elastic member on the one surface of the metal plate and inside the through hole to obtain a laminated plate; and a through hole of the laminated plate. A second hole-punching step of punching the elastic coating layer of the portion corresponding to the above in such a manner that the elastic coating layer remains on the inner peripheral edge of the through hole; and punching the seal forming position of the laminated plate to form an annular laminated plate. To obtain the blanking process and bend the outer peripheral edge of the seal to the other side,
A gist includes a hem bending step of forming a hem bending portion.

In the bearing seal of the present invention, the elastic coating layer on the outer peripheral edge portion of the seal closely adheres to the outer ring of the bearing, and
Since the elastic coating layer at the inner peripheral edge of the through hole is in close contact with the inner ring of the bearing, the inner and outer rings of the bearing can be reliably sealed and grease leakage can be reliably prevented.

Further, the force applied to the outer ring when mounted on the bearing is
It is mainly the elastic repulsive force of the core plate, and unlike the seal made of metal, for example, a large force associated with the caulking process is not applied to the outer ring. For this reason, even when it is mounted on the outer ring having a small size and low rigidity, it is possible to reliably prevent problems due to deformation of the outer ring.

Further, since the seal of the present invention is provided with the metal core plate, unlike the seal made of synthetic resin, for example,
It is possible to effectively prevent the generation of harmful warpage due to heat deterioration during rotation of the bearing, and to obtain sufficient durability.

Further, in the bearing seal of the present invention, the inclination angle of the rim bending portion with respect to the axis is set to 2 ° to 5 °, and the outer peripheral surface of the rim bending portion is formed on the bearing outer ring when the bearing is mounted. And the bending angle of the edge bending portion is set to 5 ° to 60 °, and the tip of the edge bending portion is formed on the bearing outer ring in a bearing mounted state. Any configuration of pressing the inner surface of the circumferential groove may be employed.

In the case of adopting the latter configuration, the pressing force in the outer diameter direction, which adversely affects the outer ring when the bearing is mounted, can be reduced, and harmful outer ring deformation can be prevented more reliably.

On the other hand, in the seal of the present invention, as specified in the second aspect of the present invention, press working such as punching step, blanking step, edge bending step, forming a coating layer on a metal plate, etc. Since the manufacturing can be performed only by the work that is less burdensome for the worker, it is possible to improve the production efficiency and reduce the cost. Moreover, this manufacturing method does not increase the burden on the operator even if the product size becomes small, and can maintain high production efficiency at low cost even when manufacturing a small size seal for a miniature bearing or the like.

In the second aspect of the invention, it is possible to simultaneously perform the blanking step and the edge bending step, in which case the production efficiency can be further improved.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> FIGS. 1 to 3 are views showing a bearing seal (S1) according to a first embodiment of the present invention.
As shown in these figures, the seal (S1) includes one surface of the annular metal core plate (21) and the core plate through hole (21a).
It has an annular laminated plate (20) in which an elastic coating layer (22) made of an elastic member is formed on the inner peripheral edge portion of the outer peripheral edge portion, and the outer peripheral edge portion is bent to the other surface side to form a rising edge portion (3).
0) is formed.

On the other hand, on the inner circumference of the outer ring (1a) of the bearing (1) on which the seal (S1) is mounted, the inner circumference step portion (1f), the inner circumference groove (1d), and the inner circumference are arranged in this order from the inner side. The end face (1e) is formed.

In order to mount the bearing seal (S1) on the bearing (1), the seal (S1) is provided with its edge bent portion (30) against the elastic repulsive force of the core plate (21). It may be bent inward so that it fits into the annular opening (1c) between the wheels (1a) and (1b). As a result, the elastic coating layer (22) on the outer circumference of the seal is brought into close contact with the inner peripheral end surface (1e) and the inner peripheral stepped portion (1f) of the outer ring (1a) and is provided on the inner peripheral edge of the through hole (21a). With the elastic coating layer (22) in close contact with the inner ring (1b), the outer peripheral surface of the edging portion (30) is pressed against the inner peripheral end surface (1e) of the outer ring (1a) by the elastic repulsive force of the core plate (21). Then, it is fixed to the bearing (1).

The structure of the bearing seal (S1) will be described in detail below.

As the core plate (21) of the seal (S1), one made of a rigid metal can be used, and among them, one made of stainless steel, aluminum, cold rolled steel plate or the like can be preferably used. The elastic coating layer (22) may be made of an elastic material, for example, synthetic rubber such as nitrile rubber (NBR), acrylic rubber, fluororubber, urethane rubber, polyamide, polyacetal, polybutylene terephthalate. , Synthetic elastomers such as thermoplastic elastomer and thermoplastic urethane can be used, and particularly NBR can be preferably used.

The laminate (20) has a thickness of 0.1 to 0.5.
It is preferable to use the one having an upper limit value of 0.3 mm or less, and more preferably the one having a lower limit value of 0.15 mm and an upper limit value of 0.25 mm. . That is, if the thickness of the laminated plate (20) is too thin, sufficient rigidity cannot be obtained, and deformation or the like is likely to occur, which is not preferable. Conversely, if the thickness is too thick, the rigidity becomes too high. However, it is not preferable because the bearing (1) becomes difficult to mount and the material cost rises.

The thickness of the core plate (21) is 0.1 to 0.3 m.
It is preferable that the lower limit value is 0.m.
It is preferable to use one having an upper limit value of 15 mm or more and an upper limit value of 0.25 mm or less. That is, if the thickness of the core plate (21) is too thin, the rigidity is lowered, and if it is too thick, the rigidity is too high, and the same problems as described above occur, which is not preferable.

The thickness of the coating layer (22) laminated on the core plate (21) is preferably 0.03 to 0.10 mm, and the lower limit of the thickness is 0.05 mm or more. The thing of can be used still more suitably. That is, if the thickness of the coating layer (22) is too thin, the outer ring (1a) cannot be sufficiently adhered when the bearing is mounted, and sufficient adhesion cannot be secured, which is not preferable. On the contrary, the coating layer (2
When the thickness of 2) becomes too thick, the core plate (21) becomes relatively thick.
Is thin, and the same problem as described above occurs, which is not preferable.

The thickness of the coating layer (22) provided on the inner peripheral edge of the through hole (21a) is set to be the same as that of the laminated plate (20) from the viewpoint of the manufacturing method described later.

The edging portion (30) is a seal (S1).
It is preferable to form it so as to incline slightly outward with respect to the central axis line of, and its inclination angle α is preferably set to 2 ° to 5 °. That is, when the inclination angle α becomes too large, it is necessary to largely bend the edge bending portion (30) when mounting the bearing (1), and the elastic repulsive force at that time becomes large, which makes mounting work difficult. There is a fear. On the contrary, if the inclination angle α becomes too small, when mounted on the bearing (1),
It is not preferable because the edge bent portion (30) cannot be sufficiently pressed into contact with the bearing outer ring (1a) and sufficient mounting strength cannot be obtained.

In the method of manufacturing the bearing seal (S1) having the above structure, first, as shown in FIGS. 4 (a) and 5 (a), the metal plate (50) to be the core plate (21) is pressed. And a large number of through holes (21
Drill a).

The size of the through hole (21a) is such that the elastic coating layer (22) at the inner peripheral edge portion, which functions as a seal lip described later, maintains appropriate rigidity and can maintain a stable seal contact state with the inner ring. Set to.

Next, the surface (one surface) of the perforated metal plate (50) and the inner peripheral surface of the hole (rubbered area) are subjected to degreasing treatment such as alkali degreasing treatment or solvent degreasing treatment for cleaning,
The rubberized area is roughened using shot blasting or the like.

Further, chemical conversion treatment such as phosphate treatment is applied to the rubber-attached region of the perforated metal plate (50).

Subsequently, an adhesive is applied to the rubber-attached region of the metal plate (50), and then various kinds of vulcanizing agent and various other materials are added to the NBR as shown in FIGS. 4 (b) and 5 (b). The rubber solution to which the additive of (1) is added is coated on the entire surface of the metal plate (50) so as to cover the rubberized region, that is, the through hole (21a). After that, the rubber solution is dried and vulcanized,
An elastic coating layer (22) is formed to form a laminate.

Next, as shown in FIG. 4C, the through hole (2
1a), the elastic coating layer (22) is provided with a through hole (21
The elastic coating layer has a size smaller than that of a), that is, the elastic coating layer (22) remains along the inner peripheral edge of the through hole (21a). Punch (22).

At this time, if the elastic coating layer (22) is formed on the entire surface of the metal plate (50), it may be difficult to position the punching position. However, the following method is adopted. The positioning can be performed accurately and easily.

For example, in the step of forming the coating layer (22) in the previous step, the through holes (21a) in each row on both sides of the metal plate (50) are masked, and the through holes (21a) in that row are formed. The coating layer (22) may be left unformed, and the through holes (21a) on each side of the coating layer (22) may be used as guide holes to remove the inner diameter. Of course, the guide hole may be provided in a separate process.

Next, as shown in FIG. 4 (d), punching is performed along the outer peripheral edge of the seal forming position in the laminated plate to obtain an annular laminated plate (20).

Even in this punching, by using the through holes (21a) of one row on both sides as guide holes similar to the above, it is possible to perform the processing accurately and easily.

Subsequently, the outer peripheral edge portion of the annular laminated plate (20) is bent to the other surface side, and the edge bent portion (3) is raised in the axial direction.
0) is formed to obtain the bearing seal (S1) of the present embodiment as shown in FIG.

According to this bearing seal (S1), since the elastic coating layer (22) at the outer peripheral edge of the seal is in close contact with the bearing outer ring (1a), a sufficient seal is provided between the seal (S1) and the outer ring (1a). And the elastic coating layer (22) on the inner peripheral edge of the through hole (21a) adheres to the inner ring (1b) of the bearing, thereby functioning as a seal lip and sealing (S1).
Also, sufficient sealing performance can be secured between the inner ring (1b) and grease leakage can be reliably prevented.

Further, when mounted on the bearing (1), the outer ring (1a)
The force applied to the outer ring (1a) is mainly elastic resilience of the core plate (21), and unlike the conventional metal seal, a large amount of force due to the caulking process is not applied to the outer ring (1a). Therefore, even when it is mounted on the outer ring (1a) having a small size and low rigidity, it is possible to reliably prevent a defect due to deformation of the outer ring. Moreover, since the caulking process is not necessary, it is possible to prevent the generation of fine iron powder due to the process and prevent problems such as foreign matter mixing. In the present invention, the rim bending part (30) may be caulked in a small amount and press-fitted into the outer ring (1a), but even in that case, the caulking amount is very small, and the deformation force applied to the outer ring (1a) is smaller than that in the conventional case. The outer ring (1
The effect is not so large as to deform a), and since the fine iron component is not generated, the above effect can be certainly enjoyed.

The seal (S1) is basically
Since it can be manufactured only by a work such as a pressing process or a coating process of a rubber solution that is less burdensome for an operator, for example, an annular core plate is arranged in a mold as in the conventional case,
The burdensome work such as tearing burrs one by one is unnecessary, and the production efficiency can be improved and the cost can be reduced. Moreover, the pressing process and the rubber coating process used in the present embodiment do not significantly increase the burden on the operator even if the product size becomes small, and even when manufacturing a small-sized seal for miniature bearings, High production efficiency can be maintained at low cost.

Further, since the seal (S1) of this embodiment is provided with the high-strength core plate (21), unlike the conventional synthetic resin seal described above, harmful warpage or the like due to heat deterioration occurs. Can be effectively prevented, and sufficient durability can be obtained.

In this embodiment, the seal (S
The elastic coating layers (22) may be formed on both sides of 1), and in that case, rusting of the core plate (21) can be prevented and durability can be improved.

Further, in this embodiment, when the seal (S1) is mounted on the bearing (1), a part of the coating layer (22) corresponding to the inner peripheral end surface (1e) may be scraped off. Even in this case, a seal (S
Since the elastic coating layer (22) of 1) is in close contact, it is still possible to ensure sufficient sealing performance. Further, although not shown, even when only the portion corresponding to the inner peripheral end surface (1e) of the coating layer (22) remains, that portion can ensure sufficient sealing performance. Therefore, in the seal (S1) of the present embodiment, in the state where the seal is mounted on the bearing, of the close contact part of the seal outer peripheral edge part to the inner peripheral end face (1e) and the close contact part to the inner peripheral stepped part (1f), It suffices that the coating layer (22) remains in at least one of the close contact portions.

Further, in this embodiment, as shown in FIG. 6, a plurality of cutout portions (4) are formed in the edge bending portion (30) along the circumferential direction.
0) may be formed to reduce the bending force of the edging portion (30) so that the bearing (1) can be mounted smoothly.

Further, the seal (S1) of the present embodiment is intended to be mounted on the bearing (1) by elastically contacting the edge bending portion (30) with the inner peripheral end surface (1e) of the bearing outer ring (1a). Therefore, it can be mounted regardless of the shape of the inner circumferential groove (1d) of the outer ring (1a). For this reason, for example, as shown in FIG. 7, the outer ring (1
It can also be attached to a).

<Second Embodiment> FIGS. 8 to 10 are views showing a bearing seal (S2) according to a second embodiment of the present invention. The seal (S2) is different from that of the first embodiment in the shape of the edge bending portion (60) provided on the outer peripheral edge portion.

That is, the seal (S
In 2), the outer peripheral edge portion is bent to the other surface side to form an edge bent portion (60) having a bending angle β of 5 ° to 60 °.

In order to mount the seal (S2) on the bearing (1), the seal (S2) is pushed into the annular opening (1c) between the wheels (1a) and (1b) so as to fit into the edge bending portion. While flexing (60), the inner circumferential groove (1
It can be fitted in d). In this mounted state, the elastic repulsive force of the core plate (21) urges the edge-bending portion (60) in the bending direction, so that the edge portion of the core plate (21) at the tip of the edge-bending portion (60). , Inner peripheral groove (1a) of bearing outer ring (1a)
d) The elastic coating layer (22) in the vicinity of the edge bending portion (60) is pressed against the inner surface to adhere to the inner peripheral stepped portion (1f) of the outer ring (1a) and the inner peripheral edge portion of the through hole (21a). The elastic coating layer (22) provided on the inner ring (1b) adheres to the inner ring (1b).

Here, as shown in FIG. 11, the bearing outer ring (1
In the inner circumferential groove (1d) of a), the seal pressure contact area (1g) from the one end position (P1) to the bottom vicinity position (P2) is formed in a flat area having an inclination angle γ of about 45 ° with respect to the axis. It is preferable that the tip of the edge bending portion (60) of the bearing seal (S1) is pressed against this region. That is, when the press-contacting position of the tip of the edging portion deviates from the press-contacting region (1g), not only a good mounting force cannot be obtained but, in some cases, the mounting may not be possible.
Not preferred. Considering the workability of mounting the bearing seal (S2) on the bearing (1), the edge bending portion (60)
It is even more preferable that the tip end is in pressure contact with the position (P1) rather than the midpoint of the positions (P1) and (P2).

The bearing seal (S
In 2), the bending angle β of the bent portion (60) is 5 °
-60 °, preferably lower limit is 10 ° or higher, upper limit is 40 °
Below, more preferably, the lower limit is 20 ° or more and the upper limit is 40 °
It is better to set it below °. That is, if the bending angle β is too large or too small, the pressure contact position of the tip of the edge bending portion (60) to the bearing outer ring (1a) cannot be set within the seal pressure contact area (1g) described above, and This is not preferable because it causes the same problem as.

When the bearing seal (S2) is mounted on the bearing (1), the elastic coating layer (22) is in close contact with the inner peripheral step (1f), but good adhesion is secured. For this reason, it is preferable that the thickness of the coating layer (22) at the close contact portion is made to be compressed by ¼ to ½ of that in the natural state.

Since the other construction is the same as that of the first embodiment, the same or corresponding parts are designated by the same reference numerals,
Overlapping description is omitted.

The above-mentioned manufacturing method of the bearing seal (S2) is carried out substantially in the same manner as that of the first embodiment.

That is, as shown in FIGS. 4 (a) and 5 (a), a large number of through holes (21a) are formed in the metal plate (50). Subsequently, after cleaning and roughening a predetermined area (rubbered area) of the metal plate (50) and further performing chemical conversion treatment, as shown in FIGS. 4 (b) and 5 (b), metal An elastic coating layer (22) is formed on the rubberized area of the plate (50) to obtain a laminated plate.

Next, as shown in FIG. 4C, the through hole (2
1a), the elastic coating layer (22) is provided with a through hole (21
The elastic coating layer (22) is punched so that an inner diameter punching hole (22a) having a size smaller than that of a) is formed.

Subsequently, the perforated laminated plate is subjected to a blanking step of punching each seal forming position in an annular shape and an edge bending step of bending the outer peripheral edge of the seal into a predetermined shape.
The bearing seal (S2) having the above structure is obtained. At this time, it is common to perform the blanking process and then the edge bending process on the punched product as in the first embodiment. It is possible to perform the above two steps by one pressing operation by using a processing method. Needless to say, any method may be adopted in the present invention, but in the method in which the above two steps are performed at the same time, as shown in FIGS. 8 to 11, the tip end surface of the edge bending portion (60) is in the axial direction. However, when the above two steps are sequentially performed, the tip end surface of the edge bending portion (60) is inclined with respect to the axial direction, as shown in FIG.

As described above, also in the bearing seal (S2) of the second embodiment, the same effect as the seal (S1) of the first embodiment can be obtained.

In addition, the seal (S
In 2), it is possible to secure sufficient adhesion of the covering portion (22) while reducing the adverse effect on the outer ring (1a) as compared with the bearing seal (S2) of the first embodiment. That is, as shown in FIG. 11, in the bearing seal (S2) of the present embodiment, the force (pressing force) that pushes in the seal pressing region (1g) of the inner circumferential groove (1d) at the tip position of the edge bending portion (60). F _2A ) acts. This pressure contact force F
_2A is the axial component F _2Y parallel to the axial direction and the outer ring (1a)
Can be separated into an outer radial component F _2X which adversely affects Here, the seal pressure contact area (1
When the inclination angle γ of g) with respect to the axis is 45 °, both the outer radial direction component F _2X and the axial direction component F _2Y become equal, and the axial direction component F _2Y is the elastic covering layer (22).
_Which is equivalent to the adhesion force F _2B . That is, F _2X =
The relational expression F _2Y , F _2Y = F _2B holds.

Therefore, if the adhesion force F _2B is a [N], the outer radial direction component F _2X that adversely affects the outer ring (1a) is a [N].

On the other hand, as shown in FIG.
In the bearing seal (S1) of the embodiment, the outer ring (1
The force exerting a bad influence on a) is represented by the pressure contact force to the inner peripheral end face (1e) of the edge bending part (30).
_1X ", the frictional force between the edge-bending portion (30) and the inner peripheral end surface (1e) is" F _1Y ", the coefficient of static friction between them is" μ ", and the inner peripheral step (1f) of the elastic coating layer (22) When the adhesive force of is defined as “F _1B ”, the relational expressions F _1Y = F _1B and F _1Y = F _1X × μ are established.

At this time, assuming that the adhesion force F _1B is a [N] as in the second embodiment, the force (1a) which adversely affects the outer ring (1a) in the first embodiment. Pressing force) F _1X is a / μ [N]. Here, the coefficient of static friction between the steel plate (outer ring) and the rubber (elastic coating layer) is usually
Since it is 0.4 to 0.6, the static friction coefficient μ is set to 0.
5, the pressure contact force F _1X is a / 0.5 [N] = 2a
[N].

Even if the adhesion (sealing property) is equal, the force F _2X exerting an adverse effect on the outer ring (1a) in the bearing seal (S2) of the second embodiment is F of the first embodiment. Compared with _1X , it is about half, and it is possible to more reliably prevent a decrease in roundness and the like due to outer ring deformation, and it is possible to further improve quality.

In the second embodiment as well, in order to improve workability when fitting into the bearing (1), a plurality of cutouts are formed at predetermined intervals in the edge bending portion (60). Is also good.

The bearing seal (S2) is obtained by simplifying the shape of the bearing outer ring (1a), for example, as shown in FIG. 14, from the inner peripheral step (1f) of the outer ring (1a) to the outer ring (1a). ) It can also be applied to an outer ring (1a) having a seal pressure contact region (1h) that is inclined with respect to the axial direction toward the end. In this case, the seal contact area (1
The h) and the inner peripheral stepped portion (1f) form the inner peripheral groove (1d).

[0068]

As described above, according to the present invention, defects such as warpage and deformation of the bearing outer ring can be reliably prevented, and the bearing outer ring can be reliably sealed to the inner ring, and the production efficiency can be improved. Further, it is possible to reduce the cost, and it is possible to provide an effect that a bearing seal suitable for a small diameter bearing such as a miniature bearing and a manufacturing method thereof can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view showing a bearing seal according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an outer peripheral portion of the bearing seal of the first embodiment.

FIG. 3 is a cross-sectional view showing the bearing seal of the first embodiment in a bearing mounted state.

4A and 4B are views for explaining the manufacturing process of the bearing seal of the first embodiment, in which FIG. 4A is a cross-sectional view of the metal plate in the first drilling step, and FIG. Sectional drawing of the laminated plate in a coating layer formation process, the same figure (c) is sectional drawing of the laminated plate in a 2nd hole making process, and the same figure (d) is sectional drawing of the laminated plate in a blanking process.

5A and 5B are views for explaining the manufacturing process of the bearing seal according to the first embodiment, wherein FIG. 5A is a plan view of the metal plate in the first perforating step, and FIG. It is a top view of a laminated board in a coating layer formation process.

FIG. 6 is a plan view showing a modified example of the bearing seal according to the first embodiment.

FIG. 7 is a side sectional view showing a state where the bearing seal of the first embodiment is mounted on another type of bearing.

FIG. 8 is a sectional view showing a bearing seal according to a second embodiment of the present invention.

FIG. 9 is a cross-sectional view showing an outer peripheral portion of a bearing seal according to a second embodiment.

FIG. 10 is a cross-sectional view showing the bearing seal of the second embodiment in a bearing mounted state.

FIG. 11 is an enlarged cross-sectional view showing the periphery of an edge bending portion of the bearing seal of the second embodiment in a bearing mounted state.

FIG. 12 is a cross-sectional view showing a modified example of the bearing seal according to the second embodiment.

FIG. 13 is an enlarged cross-sectional view showing a periphery of an edge bending portion of the bearing seal according to the first embodiment in a bearing mounted state.

FIG. 14 is a side sectional view showing the bearing seal of the second embodiment mounted on another type of bearing.

FIG. 15 is a half cross-sectional view showing a conventional bearing.

FIG. 16 is a schematic perspective view showing a conventional bearing seal.

FIG. 17 is a cross-sectional view showing one side portion of a conventional bearing seal in a bearing mounted state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bearing 1a ... Outer ring 1b ... Inner ring 1d ... Inner peripheral groove 1e ... Inner peripheral end surface 1f ... Inner peripheral stepped portion 20 ... Annular laminated plate 21 ... Core plate 21a ... Through hole 22 ... Elastic coating layer 30, 60 ... Edge bending portion 50 ... Metal plate S1, S2 ... Bearing seal

Claims (5)

[Claims] 1. A bearing seal to be mounted on an annular opening between inner and outer rings of a bearing, comprising an elastic member on one surface of an annular metal core plate and an inner peripheral edge of a through hole at the center of the core plate. It is composed of an annular laminated plate on which an elastic coating layer is formed, and the outer peripheral edge part is bent to the other side to form an edge bend part, and when mounted on a bearing, the edge bend part elastically repels the core plate. The elastic coating layer in the vicinity of the edge bending portion is brought into close contact with the inner peripheral step portion formed in the bearing outer ring by being pressed against the outer ring of the bearing by force, and the elastic coating layer at the inner peripheral edge portion of the through hole is closely attached to the inner ring of the bearing. A bearing seal characterized by being configured as follows. 2. The inclination angle of the edging portion with respect to the axis is set to 2 ° to 5 °, and the outer peripheral surface of the edging portion is an inner peripheral end surface formed on the bearing outer ring when mounted on a bearing. The bearing seal according to claim 1, wherein the seal is configured to be pressed against each other. 3. The bending angle of the edging portion is 5 ° to 60 °.
The bearing seal according to claim 1, wherein the tip of the edge bending portion is configured to be in pressure contact with the inner surface of the inner peripheral groove formed in the bearing outer ring when the bearing is mounted on the bearing. 4. A method of manufacturing a bearing seal mounted on an annular opening between inner and outer rings of a bearing, comprising: punching a through hole by punching a central portion of a seal forming position of a metal plate. Corresponding to a perforating step, a coating layer forming step for forming a laminated plate by forming an elastic coating layer made of an elastic member on one surface of the metal plate and inside the through hole, and corresponding to the through hole of the laminated plate. Second punching of the elastic coating layer in a portion such that the elastic coating layer remains on the inner peripheral edge of the through hole.
The hole forming step, the blanking step of punching the seal forming position of the laminated plate to obtain an annular laminated plate, and the edge bending to bend the outer peripheral edge of the seal to the other surface side to form an edge bent portion. A method for manufacturing a bearing seal, comprising: 5. The method for manufacturing a bearing seal according to claim 4, wherein the blanking step and the edge bending step are performed simultaneously.