Sealing device for wheel bearing device and wheel bearing device equipped therewith

Abstract

To provide a seal device of a wheel bearing device which is used in a wheel bearing device, comprises two lip seals, and can prevent sticking of the sealing devices when the sealing devices are stacked, and to provide the wheel bearing device including the sealing devices.SOLUTION: A sealing device 5 of a wheel bearing device 1 is used to seal an annular space S formed between an outer member 2 and an inner member 3 of the wheel bearing device 1 and includes: a core grid 51 which is fitted with an inner side of an end inner diameter surface 2a of the outer member 2; and an elastic member 52 fitted into the core grid 51. The elastic member 52 has: a first lip 52a and a second lip 52b which slidably contact with an end outer diameter surface 3a of the inner member 3 at an inner diameter side of the elastic member 52; and a circumferential surface 52c which is provided facing an axial outer side of the wheel bearing device 1 at an outer diameter side of the elastic member 52. The circumferential surface 52c is provided with projection parts 52d projecting to the axial outer side of the wheel bearing device 1.SELECTED DRAWING: Figure 3

Description

【Technical Field】 【0001】 The present invention relates to a sealing device for a wheel bearing device and a wheel bearing device including the same. 【Background Art】 【0002】 Conventionally, a sealing device for a wheel bearing device has been known (see Patent Document 1 and Patent Document 2). Such a sealing device includes a mandrel that is fitted inside the inner diameter surface of the end portion of an outer member, and an elastic member that is fitted onto the mandrel. The sealing device is used to prevent the intrusion of foreign matter (e.g., muddy water, dust, oil) into the bearing. 【0003】 By the way, such a sealing device is transported in a state of being stacked in the vertical direction. When the sealing device is transported, adsorption may occur between the sealing devices due to the weight of the sealing devices stacked on top. If adsorption occurs between the sealing devices, when assembling the wheel bearing device, a plurality of sealing devices may be sent to the line as a lump while overlapping, which may cause the manufacturing process to stop. In a sealing device composed of a so-called pack seal in which a seal plate and a slinger are arranged to face each other, a technique for preventing adsorption between the sealing devices is known. For example, Patent Document 1 discloses a technique of forming a protrusion made of an elastic member so as to protrude inward in the axial direction of the wheel bearing device to prevent adsorption between the sealing devices. Further, Patent Document 2 discloses a technique of integrally forming a metal adsorption prevention structure on a metal ring (mandrel) to prevent adsorption between the sealing devices. 【0004】 On the other hand, in sealing devices composed of so-called two-lip seals, which have a first lip and a second lip that slide against the outer diameter surface of the end of the inner member, the contact area between sealing devices when stacked is smaller due to their structure compared to pack seals. Therefore, in two-lip seal sealing devices, suction between sealing devices is less likely to occur, and there was no technology to prevent suction between sealing devices when stacked. However, for example, sealing devices used as bearing devices for truck wheels have a large diameter and mass, so when stacked, the core metal and elastic member are pressed together, and suction between the core metal and elastic member can occur. Therefore, even with two-lip seals, which have a small contact area between sealing devices, suction between sealing devices can occur, similar to pack seals. [Prior art documents] [Patent Documents] 【0005】 [Patent Document 1] Japanese Patent Publication No. 2014-081018 [Patent Document 2] Japanese Patent Publication No. 2004-278619 [Overview of the Initiative] [Problems that the invention aims to solve] 【0006】 The present invention provides a sealing device for a wheel bearing that prevents the sealing devices from adhering to each other when stacked, and a wheel bearing device equipped therewith, in a two-lip seal sealing device used in a wheel bearing device. [Means for solving the problem] 【0007】 The first invention was, It is used to seal the annular space formed between the outer and inner members of a wheel bearing device. A core metal fitted into the inner diameter surface of the end of the outer member, The system comprises an elastic member fitted onto the aforementioned core metal, The elastic member is a sealing device for a wheel bearing device, having a first lip and a second lip that slide against the outer diameter surface of the end of the inner member on the inner diameter side of the elastic member, and a circumferential surface provided on the outer diameter side of the elastic member facing outward in the axial direction of the wheel bearing device, The circumferential surface is provided with a projection that protrudes outward in the axial direction from the wheel bearing device. 【0008】 The second invention relates to a sealing device for a wheel bearing device according to the first invention, The aforementioned protrusions extend from the outer diameter side end of the circumferential surface to partway towards the inner diameter side end of the circumferential surface, and are arranged in a radial pattern in multiple locations. 【0009】 The third invention relates to a sealing device for a wheel bearing device according to the first invention, The aforementioned protrusions extend from the outer diameter side end of the circumferential surface to the inner diameter side end of the circumferential surface and are arranged radially in multiple configurations. 【0010】 The fourth invention relates to a sealing device for a wheel bearing device according to the first invention, The aforementioned projection extends along the circumferential direction of the circumferential surface and is formed in a circular shape. 【0011】 The fifth invention relates to a sealing device for a wheel bearing device according to any of the first to fourth inventions, The cross-sectional shape of the aforementioned protrusion is triangular. 【0012】 The sixth invention relates to a sealing device for a wheel bearing device according to any of the first to fourth inventions, The cross-sectional shape of the aforementioned protrusion is assumed to be trapezoidal. 【0013】 The seventh invention relates to a sealing device for a wheel bearing device according to any of the first to fourth inventions, The cross-sectional shape of the aforementioned protrusion is assumed to be a semicircle. 【0014】 The eighth invention is a sealing device for a wheel bearing device according to any of the first to seventh inventions, The height of the aforementioned protrusion is assumed to be between 0.01 and 0.15 mm. 【0015】 The ninth invention is a wheel bearing device equipped with a sealing device according to any of the first to eighth inventions. [Effects of the Invention] 【0016】 The present invention provides the following effects: 【0017】 In the sealing device according to the first invention, a projection is provided on the circumferential surface that protrudes axially outward from the wheel bearing device. With such a sealing device, the contact area between the core metal and the elastic member is reduced when the sealing devices are stacked. Therefore, in a two-lip seal sealing device used in a wheel bearing device, it is possible to prevent the sealing devices from adhering to each other when stacked. 【0018】 In the sealing device according to the second invention, the projections extend from the outer diameter side end of the circumferential surface to partway toward the inner diameter side end of the circumferential surface and are arranged radially in multiple locations. With such a sealing device, in the inspection process during the assembly of the wheel bearing device, the measurement of the position of the sealing device is not hindered by selecting the circumferential surface between adjacent projections as the measurement target. Furthermore, since the contact area between the core metal and the elastic member is reduced compared to extending the projections to the inner diameter side end of the circumferential surface, improved resistance to adhesion when stacked can be expected. In addition, a reduction in manufacturing costs is expected due to the reduction in the amount of material removed from the mold for forming the elastic member and the material used for the projections. 【0019】 In the sealing device according to the third invention, the protrusions extend from the outer diameter side end of the circumferential surface to the inner diameter side end of the circumferential surface, and are arranged in a plurality radially. According to such a sealing device, in the inspection process during the assembly of the wheel bearing device, by selecting the circumferential surface between adjacent protrusions as the measurement target location, the measurement of the position of the sealing device is not hindered. Also, since the protrusions are longer in the radial direction of the circumferential surface than when the protrusions extend only halfway from the outer diameter side end of the circumferential surface to the inner diameter side end, an improvement in stability during stacking can be expected. 【0020】 In the sealing device according to the fourth invention, the protrusions extend along the circumferential direction of the circumferential surface and are formed in a circumferential shape. According to such a sealing device, the contact area between the mandrel and the elastic member when the sealing devices are stacked decreases. Therefore, in the two-lip seal sealing device used in the wheel bearing device, adsorption between the stacked sealing devices can be prevented. 【0021】 In the sealing device according to the fifth invention, the cross-sectional shape of the protrusion is triangular. According to such a sealing device, the contact area between the mandrel of the sealing device and the elastic member can be decreased, and a structure for preventing adsorption between the stacked sealing devices can be achieved. 【0022】 In the sealing device according to the sixth invention, the cross-sectional shape of the protrusion is trapezoidal. According to such a sealing device, the contact area between the mandrel and the elastic member when the sealing devices are stacked can be decreased, and a structure for preventing adsorption between the sealing devices can be achieved. Also, since the tip of the protrusion is formed flat instead of angular, an improvement in stability during stacking can be expected. 【0023】 In the sealing device according to the seventh invention, the cross-sectional shape of the protrusion is semi-circular. According to such a sealing device, the contact area between the mandrel and the elastic member when the sealing devices are stacked can be decreased, and a structure for preventing adsorption between the sealing devices can be achieved. Also, since the tip of the protrusion is formed curved instead of angular, an improvement in stability during stacking can be expected. 【0024】 In the sealing device according to the eighth invention, the height of the projection is 0.01 to 0.15 mm. With such a sealing device, since the projection is less likely to fall over, it is possible to create a structure that prevents adhesion between sealing devices without impairing the stability when the sealing devices are stacked. 【0025】 The ninth invention relates to a wheel bearing device, which is equipped with a sealing device according to the first to eighth inventions. With such a wheel bearing device, the occurrence of adhesion between sealing devices is prevented, and thus a decrease in productivity in the assembly process of the wheel bearing device can be suppressed. [Brief explanation of the drawing] 【0026】 [Figure 1] A cross-sectional view showing a wheel bearing device. [Figure 2] A cross-sectional view showing part of the structure of a wheel bearing device. [Figure 3] A cross-sectional view and a front view showing a sealing device according to the first embodiment. [Figure 4] A cross-sectional view showing a projection of the sealing device according to the first embodiment. [Figure 5] A cross-sectional view showing the measurement target area of ​​the sealing device according to the first embodiment. [Figure 6] A cross-sectional view and a front view showing a sealing device according to the second embodiment. [Figure 7] A cross-sectional view and a front view showing a sealing device according to the third embodiment. [Figure 8] A cross-sectional view showing a projection of a sealing device according to another embodiment. [Figure 9] A cross-sectional view showing a projection of a sealing device according to another embodiment. [Figure 10] A diagram showing the results of the height analysis of the protrusions. [Modes for carrying out the invention] 【0027】 First, the wheel bearing device 1 according to the present invention will be described. Figure 1 is a cross-sectional view showing the wheel bearing device 1. Figure 2 is a cross-sectional view showing a part of the structure of the wheel bearing device 1. 【0028】 The wheel bearing device 1 supports the wheel so that it can rotate freely. The wheel bearing device 1 comprises an outer member 2, an inner member 3, and two rows of rolling elements 4. In this specification, "inner side" refers to the side of the wheel bearing device 1 that is attached to the vehicle body, and "outer side" refers to the side of the wheel bearing device 1 that is attached to the vehicle body. 【0029】 The outer member 2 constitutes the outer ring portion of the rolling bearing structure. An inner diameter end surface 2a is formed on the inner circumference of the inner end of the outer member 2. An inner diameter end surface 2b is formed on the inner circumference of the outer end of the outer member 2. Furthermore, two outer rolling surfaces 2c and 2d are formed on the inner circumference adjacent to the inner diameter end surfaces 2a and 2b. The outer rolling surface 2c faces the inner rolling surface 3c, which will be described later. The outer rolling surface 2d faces the inner rolling surface 3d, which will be described later. In addition, an inner end surface 2e is formed on the inner side adjacent to the inner diameter end surface 2a. The outer member 2 is fixed by a flange 26 while fitted inside the hub ring 25. It is then rotated by the drive shaft 27 together with this flange 26. 【0030】 The inner member 3 constitutes the inner ring portion of the rolling bearing structure. The inner member 3 is formed by butting a first inner member 31 and a second inner member 32 together. The inner member 3 is fitted onto the outside of the support shaft 33 and fixed by a nut 34. At this time, appropriate preload is applied by the tightening force of the nut 34. 【0031】 An end outer diameter surface 3a is formed on the outer circumference of the inner end of the first inner member 31. Furthermore, an inner rolling surface 3c is formed on the outer circumference adjacent to the end outer diameter surface 3a. The inner rolling surface 3c faces the aforementioned outer rolling surface 2c when the first inner member 31 is positioned inside the outer member 2. 【0032】 An end outer diameter surface 3b is formed on the outer circumference of the outer end of the second inner member 32. Furthermore, an inner rolling surface 3d is formed on the outer circumference adjacent to the end outer diameter surface 3b. The inner rolling surface 3d faces the aforementioned outer rolling surface 2d when the second inner member 32 is positioned inside the outer member 2. 【0033】 The rolling element row 4 constitutes the rolling portion of the rolling bearing structure. The inner rolling element row 4 consists of multiple tapered rollers 41 and one inner fitting 42. Similarly, the outer rolling element row 4 also consists of multiple tapered rollers 41 and one inner fitting 42. In other words, the wheel bearing device 1 according to this embodiment constitutes a double-row tapered roller bearing using tapered rollers 41 in the rolling element row 4. 【0034】 Each of the conical rollers 41 is arranged in a circular pattern at equal intervals by an internal fitting 42. The conical rollers 41 constituting the inner rolling element row 4 are interposed to roll freely between the outer rolling surface 2c of the outer member 2 and the inner rolling surface 3c of the inner member 3 (first inner member 31), and the conical rollers 41 constituting the outer rolling element row 4 are interposed to roll freely between the outer rolling surface 2d of the outer member 2 and the inner rolling surface 3d of the inner member 3 (second inner member 32). 【0035】 The inner fitting 42 is a tapered lattice body in which a small-diameter annular portion 42a and a large-diameter annular portion 42b are connected by a plurality of columnar portions 42c. The small-diameter annular portion 42a follows the small-diameter end face 41a of the conical roller 41, thereby limiting the axial displacement (slippage) of the conical roller 41 to one side. The large-diameter annular portion 42b follows the large-diameter end face 41b of the conical roller 41, thereby limiting the axial displacement (slippage) of the conical roller 41 to the other side. The columnar portions 42c pass between adjacent conical rollers 41 and follow their outer circumferential surfaces 41c, thereby limiting the circumferential displacement (slippage) of the conical roller 41 to both sides. 【0036】 Incidentally, the wheel bearing device 1 includes a pair of sealing devices 5 and 6 used to seal the annular space S formed between the outer member 2 and the inner member 3 (first inner member 31 and second inner member 32). The inner sealing device 5 comprises one core metal 51 and one elastic member 52 and is composed of a two-lip seal. On the other hand, the outer sealing device 6 comprises one seal plate 61 and one slinger 62 and is composed of a pack seal. However, the sealing device 6 used in combination with the sealing device 5 of the present invention is not limited to the specifications disclosed herein. 【0037】 As shown in Figure 2, the sealing device 5 comprises a core metal 51 and an elastic member 52. 【0038】 The core metal 51 is formed into an annular shape by, for example, cutting out a steel plate by press working and then bending it. The core metal 51 is fitted into the inner diameter surface 2a of the end of the outer member 2. The core metal 51 has a cross-section that is bent vertically in the axial direction of the wheel bearing device 1. As a result, the core metal 51 has a cylindrical fitting portion 51a and a disc-shaped side plate portion 51b that extends from its end toward the inner member 3 (first inner member 31). 【0039】 The elastic member 52 is made of, for example, synthetic rubber and has a first lip 52a and a second lip 52b. The tip edge of the first lip 52a slides against the end outer diameter surface 3a of the first inner member 31 via an oil film on the inner diameter side of the elastic member 52. A garter spring 53 is fitted to the first lip 52a to enhance the sealing between the first lip 52a and the end outer diameter surface 3a of the first inner member 31. The second lip 52b is provided on the axially inward side of the wheel bearing device 1 relative to the first lip 52a. The tip edge of the second lip 52b also slides against the end outer diameter surface 3a of the first inner member 31 via an oil film on the inner diameter side of the elastic member 52. In this way, the sealing device 5 prevents the intrusion of foreign matter (e.g., muddy water, dust, oil). 【0040】 In addition, the elastic member 52 has a circumferential surface 52c. The circumferential surface 52c is a circumferential plane and is provided on the outer diameter side of the elastic member 52 facing outward in the axial direction of the wheel bearing device 1. The circumferential surface 52c is provided with a projection 52d that protrudes outward in the axial direction of the wheel bearing device 1. 【0041】 Next, the features and effects of the first embodiment of the sealing device 5 will be described using Figures 3 to 5. Figure 3(A) shows a cross-sectional view of the sealing device 5. Figure 3(B) shows a front view of the sealing device 5 and an enlarged view of the circumferential surface 52c and projection 52d. 【0042】 As shown in Figure 3, the projections 52d extend from the outer diameter end 52c1 of the circumferential surface 52c to partway towards the inner diameter end 52c2 of the circumferential surface 52c, and are arranged radially in multiple configurations. The projections 52d are arranged, for example, at equal intervals in the circumferential direction of the circumferential surface 52c, but their number and spacing are not particularly limited. Alternatively, the projections 52d may extend from the inner diameter end 52c2 of the circumferential surface 52c to partway towards the outer diameter end 52c1 of the circumferential surface 52c, and be arranged radially in multiple configurations. 【0043】 As shown in Figure 4, the projection 52d has a triangular cross-sectional shape. The projection 52d has two inclined surfaces 52e that slope toward the tip. When the sealing devices 5 are stacked, the projection 52d contacts the core metal 51 of the sealing device 5 stacked on top of it from the tip portion of the projection 52d. 【0044】 The projection 52d elastically deforms when the sealing devices 5 are stacked, supporting the core metal 51 of the sealing device 5 stacked on top. As a result, the contact area between the core metal 51 and the elastic member 52 is reduced compared to supporting the core metal 51 of the sealing device 5 stacked on top with the entire circumferential surface 52c. In addition, because the projection 52d is formed in a square shape, the contact area between the core metal 51 and the elastic member 52 at the tip side of the projection 52d is reduced. 【0045】 As described above, in the sealing device 5 according to the present invention, the circumferential surface 52c is provided with a projection 52d that protrudes outward in the axial direction from the wheel bearing device 1. With such a sealing device 5, the contact area between the core metal 51 and the elastic member 52 when the sealing devices 5 are stacked is reduced. Therefore, in a two-lip seal sealing device 5 used in a wheel bearing device 1, it is possible to prevent the sealing devices 5 from adhering to each other when stacked. 【0046】 Furthermore, in the sealing device 5 according to the present invention, the cross-sectional shape of the projection 52d is triangular. With such a sealing device 5, the contact area between the core metal 51 and the elastic member 52 can be reduced, and a structure can be made that prevents the sealing devices 5 from adhering to each other when stacked. 【0047】 As shown in Figure 5, in the inspection process after the sealing device 5 has been incorporated into the wheel bearing device 1, the height of measuring part A located on the inner end face 2e and the height of measuring part B located on the circumferential surface 52c are measured to determine the press-fit position of the sealing device 5, and the difference in height between measuring part A and measuring part B is calculated. At this time, by selecting the circumferential surface 52c between adjacent protrusions 52d as the measurement point, it becomes possible to measure the press-fit position in the same way as in conventional sealing devices that do not have protrusions 52d. 【0048】 As described above, in the sealing device 5 according to the present invention, the projections 52d extend from the outer diameter side end 52c1 of the circumferential surface 52c to partway toward the inner diameter side end 52c2 of the circumferential surface 52c, and are arranged radially in multiple locations. With such a sealing device 5, in the inspection process during the assembly of the wheel bearing device 1, by selecting the circumferential surface 52c between adjacent projections 52d as the measurement target, the measurement of the position of the sealing device 5 is not hindered. Furthermore, since the contact area between the core metal 51 and the elastic member 52 is reduced compared to extending the projections 52d to the inner diameter side end 52c2 of the circumferential surface 52c, an improvement in anti-adhesion performance when stacking can be expected. In addition, a reduction in manufacturing costs is expected due to the reduction in the amount of material removed from the mold for forming the elastic member 52 and the material used for the projections 52d. 【0049】 Next, using Figure 6, we will describe the features and effects of the sealing device 5, which is the second embodiment. Here, we will only describe the parts that differ from the wheel bearing device 1 according to the first embodiment. 【0050】 As shown in Figure 6, the projection 52d extends from the outer diameter side end 52c1 of the circumferential surface 52c to the inner diameter side end 52c2 of the circumferential surface 52c. The projection 52d supports the core metal 51 of the sealing device 5 that is stacked on top of the other sealing device 5 when the sealing devices 5 are stacked, extending from the outer diameter side end 52c1 of the circumferential surface 52c to the inner diameter side end 52c2 of the circumferential surface 52c. 【0051】 As described above, in the sealing device 5 according to the present invention, the projections 52d extend from the outer diameter side end 52c1 of the circumferential surface 52c to the inner diameter side end 52c2 of the circumferential surface 52c and are arranged radially in multiple locations. With such a sealing device 5, in the inspection process during the assembly of the wheel bearing device 1, by selecting the circumferential surface 52c between adjacent projections 52d as the measurement target, the measurement of the position of the sealing device 5 is not hindered. Furthermore, since the projections 52d are longer in the radial direction of the circumferential surface 52c than if they were extended from the outer diameter side end 52c1 of the circumferential surface 52c to the inner diameter side end 52c2 of the circumferential surface 52c, improved stability when stacked can be expected. 【0052】 Next, using Figure 7, we will describe the features and effects of the sealing device 5, which is the third embodiment. Here again, we will only describe the parts that differ from the wheel bearing device 1 according to the first embodiment. 【0053】 As shown in Figure 7, the projection 52d is formed circumferentially around the entire circumference of the circumferential surface 52c between the outer diameter end 52c1 and the inner diameter end 52c2 of the circumferential surface 52c. The projection 52d supports the core metal 51 of the sealing device 5 that is stacked on top of the other sealing device 5, over the entire circumference of the circumferential surface 52c. 【0054】 As described above, in the sealing device 5 according to the present invention, the projection 52d extends along the circumferential direction of the circumferential surface 52c and is formed in a circumferential shape. With such a sealing device 5, the contact area between the core metal 51 and the elastic member 52 when the sealing devices 5 are stacked is reduced. Therefore, in the sealing device 5 of a two-lip seal used in a wheel bearing device 1, it is possible to prevent the sealing devices 5 from adhering to each other when stacked. 【0055】 Next, using Figures 8 and 9, we will describe the features and effects of another embodiment of the wheel bearing device 1. Here again, we will only describe the parts that differ from the wheel bearing device 1 according to the first embodiment. 【0056】 As shown in Figure 9, the projection 52d has a trapezoidal cross-sectional shape. The projection 52d has two inclined surfaces 52f that slope toward the tip, and an upper surface 52g adjacent to the two inclined surfaces 52f at the tip. When the sealing devices 5 are stacked, the projection 52d contacts the core metal 51 of the sealing device 5 stacked on top of it from the upper surface 52g. 【0057】 As described above, in the sealing device 5 according to the present invention, the cross-sectional shape of the projection 52d is trapezoidal. With such a sealing device 5, the contact area between the core metal 51 and the elastic member 52 is reduced, and a structure is made that prevents the sealing devices 5 from adhering to each other when stacked. In addition, since the tip of the projection 52d is formed flat rather than angular, improved stability when stacked can be expected. 【0058】 As shown in Figure 9, the projection 52d has a semicircular cross-sectional shape. The projection 52d has a curved surface 52h that is convex at its tip. When the sealing devices 5 are stacked, the projection 52d contacts the core metal 51 of the sealing device 5 stacked on top of it from the tip side of the curved surface 52h. 【0059】 As described above, in the sealing device 5 according to the present invention, the cross-sectional shape of the projection 52d is circular. With such a sealing device 5, the contact area between the core metal 51 and the elastic member 52 can be reduced, and a structure can be created that prevents the sealing devices 5 from adhering to each other when stacked. In addition, since the tip of the projection 52d is formed in a curved shape rather than a square shape, improved stability when stacked can be expected. 【0060】 As shown in Figure 10, the inventors investigated the height of the protrusion 52d from the perspective of stacking stability. From the test results, it was found that if the height of the protrusion 52d exceeds 0.15 mm, the protrusion 52d will fall over, making it impossible to stack the sealing devices 5 properly, which may adversely affect the stability of the sealing devices 5 during transport. In other words, by setting the height of the protrusion 52d to 0.01 mm to 0.15 mm, it is possible to create a structure that prevents the sealing devices 5 from adhering to each other without any problems in terms of stability (strength). 【0061】 As described above, in the sealing device 5 according to the present invention, the height of the projection 52d is 0.01 to 0.15 mm. With such a sealing device 5, since the projection 52d is less likely to fall over, it is possible to create a structure that prevents the sealing devices 5 from adhering to each other without impairing the stability when the sealing devices 5 are stacked. 【0062】 Furthermore, the subject of the invention could also be a wheel bearing device 1 equipped with a sealing device 5. 【0063】 In other words, the wheel bearing device 1 according to the present invention includes a sealing device 5. With such a wheel bearing device 1, the occurrence of adhesion between the sealing devices 5 is prevented, and thus a decrease in productivity in the assembly process of the wheel bearing device 1 can be suppressed. 【0064】 The wheel bearing device 1 equipped with the sealing device 5 disclosed in this application is configured as a first-generation wheel bearing device mainly consisting of an outer ring which is an outer member 2 and a pair of inner rings which are inner members 3, but is not limited thereto, and may be a second-generation structure in which a pair of inner members are press-fitted and fixed to a hub ring, or a third-generation structure in which an inner raceway surface is directly formed on the outer circumference of the hub ring. Furthermore, although the wheel bearing device 1 equipped with the sealing device 5 disclosed in this application is composed of a double-row tapered roller bearing, it may also be composed of a double-row angular contact ball bearing or the like. 【0065】 Finally, the invention described herein is not limited in any way to any of the embodiments, but is merely illustrative, and can be implemented in various forms without departing from the spirit of the invention. The scope of the invention is indicated by the claims, and further includes all modifications within the meaning and scope of equivalents as described in the claims. [Explanation of symbols] 【0066】 1. Wheel bearing device 2 Outer member 2a End inner diameter surface 3. Inner member 3a End outer diameter surface 5 Sealing device 51 Mandrel 52 Elastic members 52a First lip 52b Second lip 52c Circumferential surface 52c1 Outer diameter end 52c2 Inner diameter end 52d protrusion S-shaped circular space

Claims

[Claim 1] It is used to seal the annular space formed between the outer and inner members of a wheel bearing device. A core metal fitted into the inner diameter surface of the end of the outer member, The system comprises an elastic member fitted onto the aforementioned core metal, The elastic member is a sealing device for a wheel bearing device, having a first lip and a second lip that slide against the outer diameter surface of the end of the inner member on the inner diameter side of the elastic member, and a circumferential surface provided on the outer diameter side of the elastic member facing outward in the axial direction of the wheel bearing device, The circumferential surface is provided with a projection that protrudes outward in the axial direction from the wheel bearing device. The aforementioned protrusions extend from the outer diameter side end of the circumferential surface to partway toward the inner diameter side end of the circumferential surface, and are arranged radially in multiple configurations. The height of the aforementioned projection is 0.01 mm or more and less than 0.10 mm. A sealing device for a wheel bearing, characterized by the following features. [Claim 2] It is used to seal the annular space formed between the outer and inner members of a wheel bearing device. A core metal fitted into the inner diameter surface of the end of the outer member, The system comprises an elastic member fitted onto the aforementioned core metal, The elastic member is a sealing device for a wheel bearing device, having a first lip and a second lip that slide against the outer diameter surface of the end of the inner member on the inner diameter side of the elastic member, and a circumferential surface provided on the outer diameter side of the elastic member facing outward in the axial direction of the wheel bearing device, The circumferential surface is provided with a projection that protrudes outward in the axial direction from the wheel bearing device. The aforementioned protrusions extend from the outer diameter side end of the circumferential surface to the inner diameter side end of the circumferential surface and are arranged radially in multiple configurations. The height of the aforementioned projection is 0.01 mm or more and less than 0.10 mm. A sealing device for a wheel bearing, characterized by the following features. [Claim 3] The cross-sectional shape of the aforementioned protrusion is triangular. A sealing device for a wheel bearing device according to claim 1 or 2. [Claim 4] The cross-sectional shape of the aforementioned projection is trapezoidal. A sealing device for a wheel bearing device according to claim 1 or 2. [Claim 5] The cross-sectional shape of the aforementioned projection is semicircular. A sealing device for a wheel bearing device according to claim 1 or 2. [Claim 6] A wheel bearing device comprising a sealing device according to any one of claims 1 to 5.

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