JP6815768B2 - Sealing device - Google Patents

Description

The present invention relates to a sealing device, and more particularly to a sealing device used to prevent foreign substances such as rainwater and muddy water from entering in a vehicle or the like.

Conventionally, in vehicles such as automobiles, hub bearings that rotatably support wheels are in an environment where they are directly exposed to foreign substances such as rainwater, muddy water, and dust. For this reason, conventionally, a sealing device for sealing the inside of a hub bearing has been attached to the hub bearing. This sealing device includes a sealing device main body fitted inside the outer ring of the hub bearing and a slinger fitted outside the inner ring of the hub bearing to seal the lubricant inside the hub bearing and to seal the inside thereof. (For example, refer to Patent Document 1) to prevent foreign matter from entering the hub.

In this type of hub bearing, a sealing device is preliminarily attached to the outer ring of the hub bearing. For example, as shown in FIG. 5, the hub bearing 110 has an annular outer ring 111 with respect to the axis x and an annular inner ring 112 that is at least partially surrounded by the outer ring 111. The hub bearing 110 is a rolling bearing, and a rolling element (ball) (not shown) is arranged between the outer ring 111 and the inner ring 112, and the outer ring 111 and the inner ring 112 can rotate relative to each other.

An annular space is formed between the outer ring 111 and the inner ring 112, and a sealing device 120 is press-fitted between the outer ring 111 and the inner ring 112 in order to seal this space. The sealing device 120 includes an annular sealing device main body 130 that is internally fitted to the outer ring 111, and an annular slinger 140 that is externally fitted to the inner ring 112.

The sealing device main body 130 includes an annular reinforcing ring 131 and an elastic body portion 132 made of a rubber material integrally formed so as to cover the reinforcing ring 131. The reinforcing ring 131 has a substantially L-shaped cross section along the axis x, and a cylindrical portion on the outer peripheral side (direction of arrow c) of the reinforcing ring 131 is liquid-tightly fitted to the inner peripheral surface of the outer ring 111. ing. The elastic body portion 132 is formed inside the reinforcing ring 131 (arrow b direction), and extends outward (arrow a direction) and inner peripheral side (arrow d direction) in the axis x direction, and the radial lip 132a and the axis x direction. The inner peripheral side lip 132b and the outer peripheral side lip 132c extending inward (in the direction of the arrow b) are provided.

The slinger 140 is a metal member having a substantially L-shaped cross section along the axis x. The slinger 140 is an annular portion extending from the inner peripheral side (arrow d direction) cylindrical portion 141 of the slinger cylindrical portion and the inner (arrow b direction) end portion of the slinger cylindrical portion 141 to the outer peripheral side (arrow c direction). A slinger disk portion 142, which is a disk-shaped portion of the above, and a slinger curved portion 143, which is a curved portion connecting the slinger cylindrical portion 141 and the slinger disk portion 142, are provided.

The slinger cylindrical portion 141 is liquid-tightly fitted to the outer peripheral surface 112a of the inner ring 112. The slinger disk portion 142 has a rubber 144 vulcanized and bonded to a surface (hereinafter, also referred to as an “inner side surface”) 142ai on the inner side (arrow b direction) of the tip portion 142a on the outer peripheral side (arrow c direction). ..

The rubber 144 has an annular disk shape, and projects inward (in the direction of arrow b) from the inner side surface 142ai of the tip portion 142a of the slinger disk portion 142. The rubber 144 adhered to the tip portion 142a of the slinger disk portion 142 is liquid-tightly pressed against the inner side surface 113a of the flange portion 113 of the inner ring 112. As a result, the rubber 144 seals between the slinger disk portion 142 of the slinger 140 and the flange portion 113 of the inner ring 112.

Japanese Unexamined Patent Publication No. 2013-234748

However, in the sealing device 120 having the above-described configuration, the rubber 144 of the slinger disk portion 142 is flanged by the pushing force generated when the slinger 140 is fitted to the outer peripheral surface 112a of the inner ring 112. It is only pressed against the inner surface 113a of 113. Therefore, the amount of crushed rubber 144 pressed against the inner side surface 113a of the flange portion 113 is insufficient, and the airtightness is not always sufficient.

Further, in order to secure a crushing amount of the rubber 144 in order to obtain sufficient airtightness, it is necessary to maintain a pushing force of a certain level or more when the slinger 140 is fitted to the flange portion 113 of the inner ring 112. For that purpose, it was necessary to strictly control the dimensional accuracy of the inner ring 112 and the slinger 140 at the time of manufacture.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a sealing device capable of ensuring sufficient airtightness without being affected by dimensional accuracy at the time of manufacturing.

In order to achieve the above object, in the present invention, an annular outer peripheral member (51) that can rotate relative to each other with respect to the axis (x) and an annular member (51) that is at least partially surrounded by the outer peripheral member (51). A sealing device (1) that seals between the inner peripheral side member (55), the sealing device main body (70) attached to the outer peripheral side member (51), and the inside of the inner peripheral side member (55). The sealing device main body (70) includes a slinger (90) attached to the outer surface (56a) of the flange portion (56) extending from the end portion to the outer peripheral side in the radial direction, and the sealing device main body (70) is centered on the axis (x). An annular reinforcing ring (71) and an annular elastic body portion (75) centered on the axis (x) made of an elastic body attached to the reinforcing ring (71). (75) has at least one seal lip (77) that abuts on the slinger (90), and the slinger (90) comes into surface contact with the outer surface (56a) of the flange portion (56). It is characterized by comprising an adhesive (95) applied to the inner side surface (91ca) of the outer peripheral side end portion (91c) of the slinger (90).

In the sealing device (1) according to one aspect of the present invention, the adhesive (95) is cyclically applied in the circumferential direction on the inner side surface (91ca) of the slinger (90). ..

In the sealing device (1) according to one aspect of the present invention, a plurality of the adhesives (95) are arranged in parallel on the inner side surface (91ca) of the slinger (90) in a state of being separated by a predetermined interval in the radial direction. It is characterized by being applied.

In the sealing device (1) according to one aspect of the present invention, the adhesive (95) is applied in a state of being scattered on the inner side surface (91ca) of the slinger (90). To do.

In the sealing device (1) according to one aspect of the present invention, the adhesive is a microcapsule type adhesive.

In the sealing device (1) according to one aspect of the present invention, the microcapsule type adhesive (95) is the slinger with a jig (100) that comes into surface contact with the outer surface (56a) of the flange portion (56). The microcapsules are crushed by the force when the (90) is pressed, and the slinger (90) and the flange portion (56) are adhered and fixed.

According to the present invention, it is possible to realize a sealing device capable of ensuring sufficient airtightness without being affected by dimensional accuracy at the time of manufacturing.

It is sectional drawing in the cross section along the axis which shows the state which the sealing device which concerns on embodiment of this invention is attached to a hub bearing. It is an enlarged view in the cross section along the axis which shows the schematic structure of the sealing device which concerns on embodiment of this invention. It is a partially enlarged sectional view which provides the explanation of pushing the slinger of the sealing apparatus which concerns on embodiment of this invention. It is an external perspective view which shows the structure of the slinger of the sealing device which concerns on other embodiment of this invention. It is sectional drawing in the cross section along the axis which shows the schematic structure of the conventional sealing apparatus.

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

FIG. 1 is a cross-sectional view taken along an axis showing a state in which the sealing device 1 according to the embodiment of the present invention is attached to the hub bearing 50. FIG. 2 is an enlarged view of a cross section along an axis showing a schematic configuration of the sealing device 1 according to the embodiment of the present invention. FIG. 3 is a partially enlarged cross-sectional view for explaining pushing the slinger 90 of the sealing device 1 according to the embodiment of the present invention.

The hub bearing 50 is, for example, a hub bearing that rotatably supports wheels in an automobile. Note that, in FIG. 1, the sealing device 1 is shown in a state of being attached to the hub bearing 50.

Hereinafter, for convenience of explanation, the outside is the arrow a direction in the axis x direction in FIGS. 1 to 3, and the inside is the arrow b direction in the axis x direction. That is, the outside is the side in the direction facing the outside of the hub bearing 50, and the side in the direction facing the atmosphere where foreign matter is present. The inside is the side in the direction facing the inside of the hub bearing 50, and is the side in the direction facing the annular space 5a. Further, in the direction perpendicular to the axis x (hereinafter, also referred to as “diameter direction”), the direction away from the axis x (arrow c direction) is the outer peripheral side, and the direction approaching the axis x (arrow d direction) is the inner peripheral side. And.

As shown in FIG. 1, the hub bearing 50 has an annular outer ring 51 as an outer peripheral side member centered on the axis x and an axis that is rotatable relative to the outer ring 51 and is partially surrounded by the outer ring 51. An annular hub 52 as an inner peripheral side member centered on x, and a plurality of bearing balls 53 arranged between the outer ring 51 and the hub 52 are provided. Specifically, the hub 52 has an inner ring 54 and a hub ring 55, and wheels (not shown) are attached to the wheel mounting flange 56 of the hub ring 55 by a plurality of hub bolts 57.

The outer ring 51 is a fixing member, and as shown in FIG. 2, the outer peripheral side (arrow c direction) surface (hereinafter, this is also referred to as “outer peripheral surface”) 51a and the inner peripheral side (arrow d direction). A flat inner (arrow b direction) end surface (hereinafter referred to as this) along a direction orthogonal to the surface (hereinafter, this is also referred to as “inner peripheral surface”) 51b and the outer peripheral surface 51a and the inner peripheral surface 51b. It has "inner end face") 51c.

The hub wheel 55 is a rotating member having a wheel mounting flange 56 as a flange portion. The hub ring 55 has an outer peripheral surface 55a facing the inner peripheral surface 51b of the outer ring 51. The wheel mounting flange 56 of the hub ring 55 is a portion extending from the inner end of the hub ring 55 in the radial direction (arrow cd direction) to the outer peripheral side (arrow c direction), and is defined as the inner end surface 51c of the outer ring 51. It has 56a of outer surfaces (hereinafter, also referred to as "outer surfaces") facing each other by a distance.

In the hub bearing 50, an annular space between the inner peripheral surface 51b of the outer ring 51 and the outer peripheral surface 55a of the hub ring 55, that is, between the outer ring 51 and the hub ring 55 (hereinafter, also referred to as “annular space”). The sealing device 1 and the sealing device 60 are attached to 5a in a press-fitted state. In the hub bearing 50, different sealing devices 1 and 60 are attached, but two sealing devices 1 are attached both outside (arrow a direction) and inside (arrow b direction) of the hub bearing 50. It may be.

The sealing device 1 prevents the lubricant from leaking from the region of the annular space 5a in which the bearing ball 53 of the hub bearing 50 is provided, and also prevents foreign matter such as rainwater, muddy water, and dust from leaking into the annular space 5a. Is trying to prevent intrusion from the outside. The configuration of the sealing device 1 will be described below, but for convenience of explanation, the configuration of the sealing device 60 will be omitted. As the sealing device 60, various known configurations can be used.

As shown in FIG. 2, the sealing device 1 attached to the hub bearing 50 is attached to the sealing device main body 70 attached to the outer ring 51, the outer peripheral surface 55a of the hub ring 55, and the outer surface 56a of the wheel mounting flange 56. It is equipped with a slinger 90.

The sealing device main body 70 is centered on an annular metal reinforcing ring 71 centered on the axis x and an elastic body x that is integrally attached so as to cover the reinforcing ring 71 from the inside (direction of arrow b). It is provided with an annular elastic body portion 75.

The reinforcing ring 71 reinforces the elastic body portion 75, and is manufactured by press working or forging using a metal material. Examples of the metal material include stainless steel and SPCC (cold rolled steel).

The reinforcing ring 71 has a cylindrical cylindrical portion 71a located on the outermost peripheral side (arrow c direction) and a disk-shaped disc portion that extends from the inner end portion of the cylindrical portion 71a to the inner peripheral side (arrow d direction). It is equipped with 71b. Specifically, the reinforcing ring 71 is formed so that the cylindrical portion 71a is fitted to the inner peripheral surface 51b of the outer ring 51. Further, the elastic body portion 75 is integrally attached to the disk portion 71b of the reinforcing ring 71 so as to cover from the inside (direction of arrow b).

The reinforcing ring 71 is arranged in a molding mold when the elastic body portion 75 is molded by cross-linking (vulcanization) molding. In the reinforcing ring 71, the elastic body portion 75 is adhered to the reinforcing ring 71 by cross-linking, so that the elastic body portion 75 is integrally formed with the reinforcing ring 71.

Examples of the elastic body of the elastic body portion 75 include various rubber-like elastic members. The rubber-like elastic member is, for example, a synthetic rubber such as ditrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), and fluororubber (FKM). The elastic body portion 75 is molded by cross-linking (vulcanization) molding using a molding die.

The elastic body portion 75 has a base portion 76, and has an outer peripheral side lip 77, an inner peripheral side lip 78, and a radial lip 79 as seal lips extending from the base portion 76, respectively.

The outer peripheral side lip 77 is located on the outer peripheral side (arrow c direction) with respect to the inner peripheral side lip 78, and its tip portion extends inward (arrow b direction) from the base portion 76. The outer peripheral side lip 77 abuts on the outer surface 90a of the slinger 90 attached to the wheel mounting flange 56 with a predetermined tightening allowance (contact width) at its tip, and is the first seal on the elastic body portion 75. Forming a lip.

The inner peripheral side lip 78 is located on the inner peripheral side (arrow d direction) with respect to the outer peripheral side lip 77, and its tip portion extends inward (arrow b direction) from the base portion 76. The inner peripheral side lip 78 abuts on the outer surface 90a of the slinger 90 attached to the wheel mounting flange 56 with a predetermined tightening margin at its tip to form a second seal lip on the elastic body portion 75. doing.

The tip of the radial lip 79 extends from the base portion 76 to the outside (direction of arrow a) and the inner peripheral side (direction of arrow d). The radial lip 79 abuts on the slinger cylindrical portion 91a (described later) of the slinger 90 with a predetermined tightening margin at the tip portion thereof, and forms a third seal lip on the elastic body portion 75. As described above, the elastic body portion 75 has at least one outer peripheral side lip 77, an inner peripheral side lip 78, and a radial lip 79 that come into contact with the slinger 90.

The slinger 90 is made of metal, for example, stainless steel, and is a plate-shaped annular member centered on the axis x. The slinger 90 is curved from the annular slinger cylindrical portion 91a centered on the axis x fitted in the outer peripheral surface 55a of the hub ring 55 and the inner (arrow b direction) end of the slinger cylindrical portion 91a to the outer circumference. An annular slinger arcuate portion 91b extending toward the side (arrow c direction) and an annular shape extending further from the outer peripheral side (arrow c direction) end of the slinger arcuate portion 91b to the outer peripheral side (arrow c direction) end. It is provided with a slinger ring portion 91c.

The slinger annular portion 91c has an inner side surface 91ca that comes into surface contact with the outer surface 56a of the wheel mounting flange 56, and the microcapsule type adhesive 95 is applied to almost all areas of the inner side surface 91ca. Specifically, the microcapsule type adhesive 95 is applied in an annular shape in the circumferential direction on the inner side surface 91ca of the slinger annular portion 91c.

The microcapsule type adhesive 95 is a liquid substance containing a large number of microcapsules in which a liquid adhesive is sealed inside a spherical outer shell. Here, the microcapsule is a minute container in which a polymer or a film-forming substance is used as a wall film and is coated with a liquid or solid core substance, and generally has a size of about 5 μm to 30 μm.

The microcapsule type adhesive 95 has a structure in which the adhesive inside flows out to the outside when the outer shell is crushed and destroyed by a pushing force at the time of crimping (for example, 0.5 to 10 MPa). Have. The microcapsule type adhesive 95 is not limited to a structure in which the outer shell is destroyed by pressing pressure, but also has a structure in which the outer shell is destroyed at a temperature during thermocompression bonding (for example, 60 to 120 degrees Celsius). It may be.

The adhesive is not limited to the microcapsule type adhesive 95, and other adhesives such as an anaerobic room temperature curable resin adhesive having a rust preventive ability may be used. This anaerobic room temperature curable resin adhesive has a slow curing rate even when it comes into contact with air, and on the other hand, it cures relatively quickly even at room temperature in a portion such as a fitting surface which does not come into contact with air. Therefore, it is not necessary to strongly press the inner side surface 91ca of the slinger annular portion 91c against the outer surface 56a of the wheel mounting flange 56, and the assembling property can be improved. As the anaerobic room temperature curable resin adhesive, for example, Loctite Tinting Compound 680 (trade name) or Loctite 603 (trade name) manufactured by Japan Loctite Co., Ltd. can be used.

Next, a crimping method for fixing the slinger 90 having such a configuration to the hub ring 55 will be described. As shown in FIG. 3, in order to fix the slinger 90 to the hub ring 55, first, the slinger cylindrical portion 91a of the slinger 90 is internally fitted into the outer peripheral surface 55a of the hub ring 55. At that time, the slinger annular portion 91c is pushed inward (in the direction of arrow b) with a pushing force P of 0.5 to 10 MPa with respect to the outer surface 56a of the wheel mounting flange 56 by a predetermined jig 100.

As a result, the microcapsules of the microcapsule type adhesive 95 applied to the inner side surface 91ca of the slinger ring portion 91c are crushed between the jig 100 and the outer surface 56a of the wheel mounting flange 56, and the inside is adhered. The agent flows out. Thus, the gap between the inner surface 91ca of the slinger ring portion 91c and the outer surface 56a of the wheel mounting flange 56 in the slinger 90 is filled with the adhesive, and then the adhesive is cured to cure the slinger ring portion 91c. Is adhesively fixed to the outer surface 56a of the wheel mounting flange 56.

In this way, the sealing device 1 can integrally fix the inner side surface 91ca of the slinger ring portion 91c of the slinger 90 and the outer surface 56a of the wheel mounting flange 56 with the microcapsule type adhesive 95. Thus, since the slinger 90 can be adhered and fixed to the hub ring 55, the slinger cylindrical portion 91a of the slinger 90 does not have to be internally fitted to the outer peripheral surface 55a of the hub ring 55 with a predetermined compression allowance.

As a result, in the sealing device 1, it is not necessary to strictly control the dimensional accuracy at the time of manufacturing so that the fitting force acts between the hub wheel 55 and the slinger 90. Therefore, the hub wheel 55 is not affected by the dimensional accuracy at the time of manufacturing. The slinger 90 can be integrally fixed to the slinger 90.

Further, since the sealing device 1 can fix the gap between the slinger ring portion 91c and the wheel mounting flange 56 in the slinger 90 without a gap with the microcapsule type adhesive 95 interposed therebetween, foreign matter can be fixed between the slinger 90 and the wheel. It is possible to prevent intrusion through the gap with the mounting flange 56.

Further, in the sealing device 1, the microcapsule type adhesive 95 is applied to the inner side surface 91ca of the slinger annular portion 91c. Therefore, the sealing device 1 has a wheel mounting flange 56 when the slinger annular portion 91c is pushed inward (in the direction of arrow b) as compared with the case where the microcapsule type adhesive 95 is applied to the inner peripheral surface of the slinger cylindrical portion 91a. Although the adhesive tends to flow out to the outer peripheral side (direction of arrow c), it is possible to prevent the adhesive from being mixed into the bearing as much as possible.

Further, since the sealing device 1 can integrally fix the slinger 90 and the wheel mounting flange 56, it is possible to prevent the slinger 90 from moving with respect to the hub wheel 55 due to vibration or the like.

Thus, the sealing device 1 can ensure sufficient airtightness without being affected by the dimensional accuracy at the time of manufacturing, as compared with the conventional case.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the sealing device 1 according to the above embodiment, and all aspects included in the concept of the present invention and the scope of claims. including. In addition, each configuration may be selectively combined as appropriate so as to achieve at least a part of the above-mentioned problems and effects. For example, the shape, material, arrangement, size, etc. of each component in the above embodiment can be appropriately changed depending on the specific usage mode of the present invention.

In the above-described embodiment, the case where the microcapsule type adhesive 95 is applied to the inner side surface 91ca of the slinger annular portion 91c in the slinger 90 in a circular shape in the circumferential direction has been described. The invention is not limited to this, and as shown in FIG. 4, a plurality of microcapsule type adhesives 96 to 98 are provided on the inner side surface 91ca of the slinger annular portion 91c in the slinger 90 in a state of being separated by a predetermined distance in the radial direction (this). In the case, for example, three) may be applied in parallel in an annular shape.

Further, in the above-described embodiment, the case where the microcapsule type adhesive 95 is applied to the inner side surface 91ca of the slinger annular portion 91c in the slinger 90 in a circular shape in the circumferential direction has been described. The present invention is not limited to this, and the slinger 90 may be applied in a state of being scattered on the inner side surface 91ca of the slinger annular portion 91c.

As described above, when a plurality of microcapsule type adhesives 95 are applied in parallel on the inner side surface 91ca of the slinger annular portion 91c in a state where they are separated by a predetermined interval in the radial direction, or when they are scattered in a plurality of states. When applied, since the amount of the microcapsule type adhesive 95 is small in the first place, it is possible to prevent the adhesive from overflowing even when the slinger annular portion 91c is pressed against the outer surface 56a of the wheel mounting flange 56. .. Moreover, when the contact area between the microcapsule type adhesive 95 and the outer surface 56a of the wheel mounting flange 56 is smaller than that of the embodiment, the pressure is the same as that of the embodiment. , The pressing force per unit area of the contact portion between the microcapsule type adhesive 95 and the outer surface 56a is increased, and thus the slinger annular portion 91c and the wheel mounting even if the pressing force is lower than that in the case of the embodiment. It can be easily adhered to the flange 56.

The case where the sealing device of the present invention is used in a hub bearing of a vehicle or the like has been described. However, the sealing device of the present invention is not limited to this, and can be used for industrial bearings, truck bearings, and the like.

1, 60, 120 Sealing device 5a Circular space 50, 110 Hub bearing 51, 111 Outer ring (outer peripheral side member)
51a Outer peripheral surface 51b Inner peripheral surface 51c Inner end surface 52 Hub 53 Bearing balls 54, 112 Inner ring 55 Hub ring (inner peripheral side member)
55a Outer peripheral surface 56 Wheel mounting flange (flange part)
56a Outer side surface 57 Hub bolt 70, 130 Sealing device main body 71, 131 Reinforcing ring 71a Cylindrical part 71b Disc part 75, 132 Elastic body part 76 Base part 77, 132c Outer peripheral side lip (seal lip)
78, 132b Inner circumference side lip (seal lip)
79, 132a Radial lip (seal lip)
90, 140 Slinger 90a Outer side surface 91a, 141 Slinger cylindrical part 91b Slinger arc-shaped part 91c Slinger annulus part (outer peripheral end)
91ca Inner side surface 95-97 Microcapsule type adhesive 100 Jig 111 Outer ring 112a Outer surface 132c Outer side side lip 142 Slinger disk 142a Tip 142ai Inner surface 143 Slinger curved 144 Rubber x axis

Claims (4)

A sealing device that seals between an annular outer peripheral member that can rotate relative to each other with respect to the axis and an annular inner peripheral member that is at least partially surrounded by the outer peripheral member.
The sealing device main body attached to the outer peripheral side member and
A slinger attached to the wheel side of the flange portion extending from the inner peripheral side member to the outer peripheral side in the radial direction and the side surface opposite to the axial direction is provided.
The sealing device main body includes an annular reinforcing ring centered on the axis and an annular elastic body portion centered on the axis composed of an elastic body attached to the reinforcing ring.
The elastic portion has at least one seal lip that abuts on the slinger.
The slinger comprises a microcapsule type adhesive applied to the wheel side surface of the outer peripheral side end portion of the slinger that comes into surface contact with the wheel side of the flange portion and the axially opposite side surface.
The microcapsule type adhesive is a sealing device characterized in that it is applied in an annular shape in the circumferential direction on the wheel side surface of the slinger. The sealing device according to claim 1, wherein a plurality of the adhesives are applied in parallel on the wheel side surface of the slinger at a predetermined distance in the radial direction. The sealing device according to claim 1, wherein the adhesive is applied in a state of being scattered on the side surface of the wheel of the slinger. The microcapsule type adhesive, the said slinger and force said crushed microcapsules by slinger when the slinger in jig for surface contact pressed against the wheel side and the axially opposite side of the flange portion flange The sealing device according to claim 1, wherein the portions are adhesively fixed.

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