Sealing device

Abstract

To provide a sealing device having a high function of preventing the intrusion of foreign matter. [Solution] A sealing device disposed between a rotating inner member and a fixed outer member of a rolling bearing comprises an annular rotary seal member fixed to the inner member and an annular seal cover fixed to an end of the outer member. The seal cover is disposed in the gap between the outer member and the inner member and comprises a fixed portion fixed to the end of the outer member, and a protective portion disposed radially outward of the rotary seal member to prevent foreign matter from advancing from the outside to the rotary seal member. The rotary seal member comprises a mounting portion fixed to the inner member, and a seal lip and dust lip extending from the mounting portion toward the seal cover. The dust lip extends obliquely from the mounting portion toward the seal cover and radially outward.

Description

[Technical Field]

[0001] The present invention relates to a sealing device that seals the inside of a rolling bearing. [Background technology]

[0002] Rolling bearings, such as ball bearings, are well known and are used, for example, in automobile hubs. Patent Document 1 describes a sealing device for sealing the interior of a rolling bearing. This sealing device includes an annular body fixed to the outer ring of the rolling bearing, a radial lip extending radially inward from the annular body, and two side lips extending laterally from the annular body. The radial lip contacts the outer surface of the inner ring of the bearing or the outer surface of a component fixed to the inner ring, thereby sealing in the lubricant inside the bearing. The two side lips contact the flange of the inner ring, etc., and thereby seal off foreign matter such as water and dust from entering the bearing from the outside. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 3991200 Summary of the Invention [Problem to be solved by the invention]

[0004] For this type of sealing device, the function of separating the inside and outside of the bearing is important. Also, when used in an environment with a lot of water (including muddy water or salt water) and dust, it is required to have an improved function of preventing these foreign objects from entering the inside of the bearing.

[0005] SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a sealing device that has a high function of preventing the intrusion of foreign matter. [Means for solving the problem]

[0006] In order to solve the above problem, the sealing device of the present invention is a sealing device that is arranged between a rotating inner member and a fixed outer member of a rolling bearing and seals the gap between the inner member and the outer member, and is characterized in that it comprises an annular rotary seal member fixed to the inner member and an annular seal cover fixed to the end of the outer member, the seal cover having a fixed portion fixed to the outer member and a protective portion that is arranged radially outward of the rotary seal member and prevents foreign matter from progressing from the outside to the rotary seal member, the rotary seal member having a mounting portion fixed to the inner member, and a seal lip and dust lip extending from the mounting portion toward the seal cover, and the dust lip extends obliquely from the mounting portion toward the seal cover and radially outward.

[0007] According to the present invention, a sealing device includes an annular rotary seal member and an annular seal cover assembled thereto. The protective portion of the seal cover is disposed radially outward of the rotary seal member and prevents foreign matter from entering the rotary seal member from the outside. The rotary seal member includes a seal lip and a dust lip extending toward the seal cover, and the dust lip extends obliquely toward the seal cover and radially outward. Therefore, even if foreign matter enters from the outside through the gap between the seal cover and the rotary seal member, the foreign matter is blocked by the dust lip and is splashed outward by the dust lip as the rotary seal member rotates.

[0008] In one aspect of the sealing device of the present invention, the seal cover further includes a cylindrical portion concentric with the outer and inner members and disposed radially inward of the outer member, and the seal lip of the rotary seal member extends obliquely from the mounting portion toward the cylindrical portion and radially outward. In this case, the centrifugal force generated by the rotation of the rotary seal member strongly presses the seal lip against the cylindrical portion of the seal cover. Therefore, even if the centrifugal force generated by the rotation of the inner member acts on the lubricant inside the bearing, the seal lip effectively reduces or prevents leakage of the lubricant.

[0009] In a sealing device according to one aspect of the present invention, the gap between the protective portion of the seal cover and the outer edge of the rotary seal member becomes smaller as it goes radially outward. In this case, since the gap between the protective portion of the seal cover and the outer edge of the rotary seal member becomes smaller as it goes radially outward, foreign matter is less likely to enter from the outside and foreign matter is more likely to be expelled from the inside of the sealing device to the outside.

[0010] In one aspect of the present invention, in a sealing device, an outer edge portion of the rotary seal member is positioned outside an inclined surface between a first wall surface of the inner member that is closest to the end of the outer member and a second wall surface of the inner member that is radially outward of the first wall surface and recessed from the first wall surface. In this case, even if a foreign object enters from the outside into the gap between the protective portion of the seal cover and the second wall surface of the inner member, because the outer edge portion of the rotary seal member is positioned outside the inclined surface between the first wall surface and the second wall surface, the foreign object will have difficulty passing through the gap between the protective portion and the outer edge portion of the rotary seal member, and therefore the foreign object will have difficulty entering the interior of the sealing device from the outside.

[0011] In one aspect of the sealing device of the present invention, the seal cover further includes an outer wall portion that is in close contact with the end of the outer member and an inner wall portion that is radially inward of the outer wall portion and located closer to the rolling elements of the rolling bearing. The rotary seal member includes two dust lips, the radially outer dust lip of the dust lips extending from the mounting portion toward the outer wall portion of the seal cover, and the radially inner dust lip of the dust lips extending from the mounting portion toward the inner wall portion of the seal cover. In this case, even if a foreign object passes through the gap between the radially outer dust lip and the outer wall portion of the seal cover, the radially inner dust lip blocks the foreign object. The radially inner dust lip extends to the inner wall portion of the seal cover that is closer to the rolling elements of the rolling bearing than the outer wall portion of the seal cover, and is therefore longer than the radially outer dust lip. Therefore, the radially inner dust lip has a high ability to block foreign objects. [Effects of the Invention]

[0012] In the present invention, the protective portion of the seal cover is positioned radially outward of the rotary seal member to prevent foreign matter from entering the rotary seal member from the outside. Even if foreign matter enters the rotary seal member from the outside through the gap between the protective portion and the rotary seal member, the foreign matter is blocked by the dust lip and is repelled by the dust lip toward the outside as the rotary seal member rotates. Therefore, the sealing device according to the present invention has a high function of preventing the intrusion of foreign matter. Furthermore, because the foreign matter is repelled by the dust lip, it is less likely to remain on the dust lip, reducing undesirable deterioration or damage to the dust lip. Furthermore, because the dust lip extends obliquely from the mounting portion toward the seal cover and radially outward, the dust lip is deformed by centrifugal force as the rotary seal member rotates faster, reducing the contact pressure of the dust lip against the seal cover. Therefore, an increase in torque due to contact between the dust lip and the seal cover is suppressed. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a partial cross-sectional view of an example of a rolling bearing in which a sealing device according to an embodiment of the present invention is used. [Figure 2] 1 is a partial cross-sectional view of a sealing device according to a first embodiment of the present invention. [Figure 3] 3 is a partial cross-sectional view of a rotary seal member of the sealing device of FIG. 2. [Figure 4] 3 is a partial cross-sectional view of a seal cover of the sealing device of FIG. 2. [Figure 5] 3 is a diagram showing a usage form of the sealing device of FIG. 2.

[0023] FIG. [Figure 6] FIG. 6 is a partial cross-sectional view of a sealing device according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] Various embodiments of the present invention will now be described with reference to the accompanying drawings. First embodiment 1 shows a hub bearing for an automobile, which is an example of a rolling bearing in which a sealing device according to an embodiment of the present invention is used. However, the application of the present invention is not limited to hub bearings, and the present invention can also be applied to other rolling bearings. Also, in the following description, the hub bearing is a ball bearing, but the application of the present invention is not limited to ball bearings, and the present invention can also be applied to other rolling bearings having other types of rolling elements, such as roller bearings and needle bearings.

[0015] This hub bearing 1 has a hub (inner member) 4 having a hole 2 into which a spindle (not shown) is inserted, an inner ring (inner member) 6 attached to the hub 4, an outer ring (outer member) 8 arranged on the outside of these, balls 10 arranged in a row between the hub 4 and the outer ring 8, balls 12 arranged in a row between the inner ring 6 and the outer ring 8, and a plurality of cages 14, 15 that hold these balls in fixed positions.

[0016] The outer ring 8 is fixed, while the hub 4 and inner ring 6 rotate as the spindle rotates.

[0017] The common axis of the spindle and hub bearing 1 extends in the left-right direction in Figure 1. In Figure 1, only the upper portion relative to the common axis is shown. The right side of Figure 1 is the outer side (outboard side) where the wheels (not shown) of the automobile are arranged, and the left side is the inner side (inboard side) where the differential gear (not shown) and the like are arranged. The outer ring 8 of the hub bearing 1 is fixed to a hub knuckle 16. The hub 4 has an outboard flange 18 for mounting a wheel.

[0018] A sealing device 20 that seals the gap between the outer ring 8 and the hub 4 is disposed at the outboard end of the outer ring 8, and a sealing device 22 that seals the gap between the outer ring 8 and the inner ring 6 is disposed inside the inboard end of the outer ring 8. The action of these sealing devices 20, 22 prevents grease, i.e., lubricant, from leaking out from inside the hub bearing 1, and prevents foreign matter from entering the inside of the hub bearing 1 from the outside.

[0019] The sealing device 20 is disposed between the rotating hub 4 of the hub bearing 1 and the fixed outer ring 8. Specifically, as shown in FIG. 2, the sealing device 20 is disposed near the outboard end of the outer ring 8 of the hub bearing 1, the balls 10, and the outboard flange 18 of the hub 4. Most of the sealing device 20 is disposed in a space surrounded by the outboard end of the outer ring 8, the outer peripheral surface 4A of the hub 4 of the hub bearing 1 near the balls 10, the flange surface 4B of the hub 4 that extends outward from the outer peripheral surface 4A and faces the end face of the outer ring 8, and the arcuate surface 4C that connects the outer peripheral surface 4A and the flange surface 4B. The sealing device 20 is annular, but only the upper portion thereof is shown in FIG. 2.

[0020] As shown in Fig. 2, the sealing device 20 includes an annular rotary seal member 24 fixed to the hub 4, and an annular seal cover 26 fixed to the end of the outer ring 8. Fig. 3 is a partial cross-sectional view of the rotary seal member 24, and Fig. 4 is a partial cross-sectional view of the seal cover 26. The sealing device 20 is an assembly that combines the rotary seal member 24 and the seal cover 26. The rotary seal member 24 and the seal cover 26 work together to seal the lubricant inside the hub bearing 1. The rotary seal member 24 is fitted into the fixed seal member 26, and can be removed by applying a large force along the axial direction of the sealing device 1 to release the fitting.

[0021] The seal cover 26 is a single rigid member made of, for example, metal, and has a curved cross-sectional shape. The seal cover 26 includes a fixed portion 28, an outer wall portion 29, and a protective portion 30. The fixed portion 28 is a cylinder concentric with the hub 4 and the outer ring 8, and is fixed to the outer ring 8. The fixing method may be, but is not limited to, an interference fit, for example. The outer wall portion 29 extends radially outward from one end of the fixed portion 28 and is brought into close contact with the end face of the outer ring 8.

[0022] The protective portion 30 has a substantially truncated cone shape and extends obliquely radially outward from the outer end of the outer wall portion 29 so as to cover most of the gap between the end face of the outer ring 8 and the outboard flange 18. The protective portion 30 is positioned radially outward of a gap G1 between the outboard end face of the outer ring 8 and the flange surface 4B of the hub 4. The protective portion 30 is also positioned radially outward of the rotary seal member 24, and prevents foreign matter from advancing from the outside to the rotary seal member 24 (i.e., into the interior of the sealing device 20). However, a gap G2 is provided between the tip of the protective portion 30 and the outboard flange 18, and foreign matter (including water (including muddy water or salt water) and dust, etc.) is allowed to pass through this gap G2.

[0023] Furthermore, the seal cover 26 includes an inner wall portion 31 and a cylindrical portion 32. The inner wall portion 31 extends radially inward from the end (the end on the ball 10 side) of the fixed portion 28 opposite the outer wall portion 29. The cylindrical portion 32 is a cylinder that extends from the inner end of the inner wall portion 31 and is concentric with the hub 4 and outer ring 8 (i.e., concentric with the fixed portion 28).

[0024] On the other hand, the rotary seal member 24 has a double structure including an elastic ring 35 made of an elastic body, such as an elastomer, and a rigid body, such as a metal reinforcing ring 36 with a substantially L-shaped cross section, that reinforces the elastic ring 35. The reinforcing ring 36 is in close contact with the elastic ring 35, and a portion of it is embedded in the elastic ring 35.

[0025] The rotary seal member 24 includes a mounting portion 38 fixed to the hub 4, and a seal lip 39 and dust lips 40, 42 extending from the mounting portion 38 toward the seal cover 26.

[0026] The mounting portion 38 is a circular ring with a substantially L-shaped cross section, and is composed of an elastic ring 35 and a reinforcing ring 36. The mounting portion 38 has a cylindrical portion 38A that covers the outer peripheral surface 4A of the hub 4, a disc portion 38B that faces the flange surface 4B of the hub 4, and an inclined portion 38C that faces the arcuate surface 4C of the hub 4. The portion of the cylindrical portion 38A that corresponds to the reinforcing ring 36 is brought into close contact with the outer peripheral surface 4A of the hub 4. The portion of the disc portion 38B that corresponds to the reinforcing ring 36 is brought into close contact with the flange surface 4B of the hub 4. The inclined portion 38C connects the cylindrical portion 38A and the disc portion 38B, and the portion of the inclined portion 38C that corresponds to the reinforcing ring 36 is brought into close contact with the arcuate surface 4C of the hub 4.

[0027] The seal lip 39 and dust lips 40, 42 are formed solely from an elastic body and are thin, circular plates extending from the elastic ring 35. The seal lip 39 extends obliquely from the cylindrical portion 38A of the mounting portion 38 toward the tubular portion 32 of the seal cover 26 and radially outward, with the tip of the seal lip 39 contacting the tubular portion 32 of the seal cover 26. As is clear from a comparison of Figures 2 and 3, when the rotating seal member 24 is fitted into the fixed seal member 26, the seal lip 39 receives a reaction force from the tubular portion 32 and is elastically deformed from its original shape. The seal lip 39 mainly serves to prevent lubricant from leaking out from inside the hub bearing 1.

[0028] Of the dust lips 40, 42, the dust lip 40 located radially outward extends obliquely from the cylindrical portion 38A of the mounting portion 38 toward the outer wall portion 29 of the seal cover 26 and radially outward. The dust lip 42 located radially inward extends obliquely from the mounting portion 38 toward the inner wall portion 31 of the seal cover 26 and radially outward. The dust lips 40, 42 mainly serve to prevent foreign matter from entering the interior of the hub bearing 1 from the outside.

[0029] 2 and 3, when the rotary seal member 24 is fitted to the stationary seal member 26, the dust lip 42 receives a reaction force from the inner wall portion 31 with which it comes into contact, causing it to be elastically deformed significantly from its original shape. Therefore, the dust lip 42 has a high foreign matter blocking function.

[0030] On the other hand, even when the rotary seal member 24 is fitted into the stationary seal member 26, the dust lip 40 is hardly or not elastically deformed at all. That is, the dust lip 40 may be brought into contact with the outer wall portion 29 of the seal cover 26 with a slight interference, or there may be a slight gap between the dust lip 40 and the outer wall portion 29. In this case, an increase in torque due to contact between the dust lip 40 and the outer wall portion 29 is prevented or suppressed.

[0031] However, like the dust lip 42, the dust lip 40 may be formed longer so that when the rotary seal member 24 is fitted to the stationary seal member 26, it receives a reaction force from the outer wall portion 29 and is elastically deformed significantly from its original shape. In this case, the dust lip 40 can have an improved foreign object blocking function.

[0032] In this embodiment, two dust lips 40, 42 are provided, but the number of dust lips may be one, or three or more.

[0033] As shown in FIG. 2, the hub 4 has an outer peripheral surface 4A, a flange surface 4B, and an arcuate surface 4C. The outer peripheral surface 4A is located near the balls 10. The flange surface (first wall surface) 4B extends radially outward from the outer peripheral surface 4A, perpendicular to the axial direction of the hub bearing 1, and faces the end face of the outer ring 8. The arcuate surface 4C connects the outer peripheral surface 4A and the flange surface 4B. The flange surface 4B forms part of the outboard flange 18.

[0034] The hub 4 also has a second flange surface (second wall surface) 4D and an inclined surface 4E. The second flange surface 4D is located radially outward of the flange surface 4B and is recessed relative to the flange surface 4B (i.e., in a direction parallel to the axial direction of the hub bearing 1, the second flange surface 4D is farther from the outer ring 8 than the flange surface 4B). The second flange surface 4D forms part of the outboard flange 18. The inclined surface 4E connects the flange surface 4B and the second flange surface 4D.

[0035] An outer edge portion 44 of the rotary seal member 24 is positioned radially outward of a gap G1 between the outboard end face of the outer ring 8 and the flange surface 4B of the hub 4. A large portion of the outer edge portion 44 is made of an elastic material and covers the outer edge of the reinforcing ring 36. The outer edge portion 44 is positioned outward of an inclined surface 4E between the flange surface (first wall surface) 4B of the hub 4 that is closest to the end of the outer ring 8 and a second flange surface 4D of the hub 4 that is radially outward of the flange surface 4B and recessed from the flange surface 4B. With this arrangement, the outer edge portion 44, the inclined surface 4E, and the second flange surface 4D form a storage space 48 for foreign matter.

[0036] The outer edge portion 44 is tapered. A gap G3, through which foreign matter can pass, is provided between this tapered surface and the protective portion 30 of the seal cover 26. This gap G3, i.e., the distance between the protective portion 30 of the seal cover 26 and the outer edge portion 44 of the rotary seal member 24, becomes smaller as it goes radially outward.

[0037] FIG. 5 shows a usage form of the sealing device 20 according to this embodiment. In particular, FIG. 5 shows a state in which water W (including muddy water or salt water) has entered the interior of the sealing device 20. As described above, according to this embodiment, the sealing device 20 includes the annular rotary seal member 24 and the annular seal cover 26 combined therewith. The protective portion 30 of the seal cover 26 is disposed radially outward of the rotary seal member 24 and prevents foreign matter (including water, dust, etc.) from advancing from the outside to the rotary seal member 24. The rotary seal member 24 includes a seal lip 39 and dust lips 40 and 42 extending toward the seal cover 26, and the dust lips 40 and 42 extend obliquely toward the seal cover 26 and radially outward. Therefore, even if foreign matter enters from the outside through the gap between the seal cover 26 and the rotary seal member 24 (gaps G2 and G3 in this embodiment), the foreign matter is blocked by the dust lips 40 and 42 and is splashed outward by the dust lips 40 and 42 as the rotary seal member 24 rotates. FIG. 5 shows splashed water droplets D. The foreign matter represented by water droplets D passes through the gaps G2 and G3 again and exits the sealing device 20 to the outside. Therefore, the sealing device 20 according to this embodiment has a high function of blocking the intrusion of foreign matter. Furthermore, because the foreign matter is splashed out by the dust lips 40 and 42, there is little risk that the foreign matter will remain on the dust lips 40 and 42, reducing undesirable deterioration or damage to the dust lips 40 and 42 due to remaining foreign matter.

[0038] In this embodiment, the dust lip 40 arranged radially outward extends from the mounting portion 38 of the rotary seal member 24 toward the outer wall portion 29 of the seal cover 26, and the dust lip 42 arranged radially inward extends from the mounting portion 38 toward the inner wall portion 31 of the seal cover 26. Even if foreign matter passes through the gap between the dust lip 40 arranged radially outward and the outer wall portion 29 of the seal cover 26, the dust lip 42 arranged radially inward blocks the foreign matter. The dust lip 42 arranged radially inward extends to the inner wall portion 31, which is located closer to the balls 10 of the hub bearing 1 than the outer wall portion 29 of the seal cover 26, and is therefore longer than the dust lip 42 arranged radially outward. Therefore, the dust lip 42 arranged radially inward has a high function of blocking foreign matter.

[0039] Furthermore, because the dust lips 40, 42 extend obliquely from the mounting portion 38 toward the seal cover 26 and radially outward, the higher the rotation speed of the rotary seal member 24, the more the dust lips 40, 42 are deformed by centrifugal force, and the contact pressure of the dust lips 40, 42 against the seal cover 26 decreases. Therefore, an increase in torque due to contact between the dust lips 40, 42 and the seal cover 26 is suppressed. In this embodiment, the dust lip 40, which is disposed radially outward, may contact the outer wall portion 29 of the seal cover 26 with a slight interference, or there may be a slight gap between the dust lip 40 and the outer wall portion 29. Foreign matter thrown off by the dust lip 42 is expected to be discharged radially outward through the gap between the dust lip 40 and the outer wall portion 29.

[0040] Although not essential, the outer edge portion 44 of the rotary seal member 24 is positioned outward from an inclined surface 4E between a flange surface 4B of the hub 4, which is closest to the end of the outer ring 8, and a second flange surface 4D of the hub 4, which is radially outward from and recessed relative to the flange surface 4B. Therefore, even if foreign matter enters from the outside through a gap G2 between the protective portion 30 of the seal cover 26 and the second flange surface 4D of the hub 4, because the outer edge portion 44 of the rotary seal member 24 is positioned outward from the inclined surface 4E between the flange surface 4B and the second flange surface 4D, the foreign matter is unlikely to pass through a gap G3 between the protective portion 30 and the outer edge portion 44 of the rotary seal member 24, and therefore the foreign matter is unlikely to enter the interior of the sealing device 20 from the outside. Figure 5 shows a state in which water W is stored in a storage space 48 formed by the outer edge portion 44, the inclined surface 4E, and the second flange surface 4D. It is expected that foreign matter (for example, water W) in the storage space 48 will be discharged by gravity, for example, traveling in the circumferential direction of the storage space 48.

[0041] Although not essential, the gap G3, i.e., the distance between the protective portion 30 of the seal cover 26 and the outer edge portion 44 of the rotary seal member 24, becomes smaller radially outward. Therefore, it is difficult for foreign matter to enter from the outside through the gap G3, and foreign matter can easily be expelled from the inside of the sealing device 20 to the outside through the gap G3.

[0042] Although not essential, the distance G4 between the outer edge portion 44 of the rotary seal member 24 and the second flange surface 4D of the hub 4 is larger than the gap G2 between the protective portion 30 of the seal cover 26 and the second flange surface 4D of the hub 4. Therefore, when foreign matter enters from the outside through the gap G2, the foreign matter accumulates in the storage space 48 and is discharged by gravity, for example, by traveling in the circumferential direction through the storage space 48, making it difficult for the foreign matter to enter the gap G3.

[0043] Although not essential, the seal lip 39 of the rotary seal member 24 extends obliquely from the mounting portion 38 toward the cylindrical portion 32 of the seal cover 26 and radially outward. As a result, the centrifugal force generated by the rotation of the rotary seal member 24 presses the seal lip 39 strongly against the cylindrical portion 32 of the seal cover 26. Therefore, even if the centrifugal force generated by the rotation of the hub 4 acts on the lubricant inside the hub bearing 1, the seal lip 39 effectively reduces or prevents leakage of the lubricant.

[0044] Second embodiment Figure 6 shows a sealing device 50 according to a second embodiment of the present invention. In Figure 6, the same reference numerals are used to indicate components that are common to the first embodiment, and these components will not be described in detail.

[0045] An elastic ring 51 made of an elastic material, for example, an elastomer, is attached to the outer wall portion 29 of the seal cover 26 of this sealing device 50. When the sealing device 50 is in use, the elastic ring 51 is disposed between the outboard end face of the outer ring 8 and the outer wall portion 29, and prevents or inhibits foreign matter from entering the gap therebetween. Instead of the elastic ring 51 fixed to the seal cover 26, an elastic part separate from the seal cover 26, for example, an O-ring, may be disposed between the outboard end face of the outer ring 8 and the outer wall portion 29.

[0046] Additionally, an elastic ring 52 formed of an elastic material, such as an elastomer, is attached to the reinforcing ring 36 portion of the disk portion 38B of the rotary seal member 24 of the sealing device 50. When the sealing device 50 is in use, the elastic ring 52 is disposed between the reinforcing ring 36 portion of the disk portion 38B of the sealing device 50 and the outboard flange 18 to prevent or suppress the intrusion of foreign matter into the gap therebetween. In this sealing device, the elastic ring 52 is continuous with the outer edge portion 44 of the rotary seal member 24, but may be spaced apart from the outer edge portion 44. Also, instead of the elastic ring 52 being part of the rotary seal member 24, an elastic part separate from the rotary seal member 24, such as an O-ring, may be disposed between the reinforcing ring 36 portion of the disk portion 38B and the outboard flange 18.

[0047] Various embodiments of the present invention have been described above, but the above descriptions do not limit the present invention, and various modifications including deletion, addition, and substitution of components are possible within the technical scope of the present invention. [Explanation of symbols]

[0048] 1 Hub bearing 2 holes 4 Hub (inner part) 4A Outer surface 4B Flange surface (first wall surface) 4C Arc Surface 4D Second flange face (second wall face) 4E Slope 6 Inner ring (inner member) 8 Outer ring (outer member) 10,12 balls 14,15 Cage 16 Hub Knuckle 18 Outboard flange 20,22,50 Sealing device 24 Rotating seal member 26 Seal cover 28 Fixed part 29 Outer wall section 30 Protected part 31 Inner wall part 32 Cylindrical part 35 Elastic Ring 36 Reinforcement ring 38 Mounting part 38A Cylindrical part 38B Disc part 38C Slope section 39 Sealing lip 40,42 Dust Trip 44 outer edge 48 Storage space 51,52 Elastic ring G1, G2, G3 gap W water D water drop

Claims

[Claim 1] A sealing device disposed between a rotating inner member and a fixed outer member of a rolling bearing, for sealing a gap between the inner member and the outer member, comprising: an annular rotary seal member fixed to the inner member; an annular seal cover fixed to an end of the outer member; The seal cover is a fixed portion fixed to the outer member; a protective portion disposed radially outward of the rotary seal member, the rotary seal member includes a dust lip; A sealing device characterized in that a gap is provided between the protective portion of the seal cover and the outer edge portion of the rotary seal member, allowing foreign matter to pass through, the gap being located radially outward of the gap between the end face of the end of the outer member and the surface of the inner member opposite to the end face, and being connected to the outside, and the tip of the protective portion of the seal cover being located closer to the outside of the rolling bearing than the outer edge portion of the rotary seal member in the axial direction of the rolling bearing.

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