sealing device
The sealing device with a slinger and cover member annular groove design effectively prevents foreign matter intrusion and discharges contaminants, enhancing sealing performance and protecting internal components.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- UCHIYAMA MFG
- Filing Date
- 2022-03-31
- Publication Date
- 2026-06-11
Smart Images
Figure 0007872978000001 
Figure 0007872978000002 
Figure 0007872978000003
Abstract
Description
【Technical Field】 【0001】 The present invention relates to a sealing device including a sealing member that seals an annular space between an inner member and an outer member that rotate coaxially relative to each other, and a cover member provided on the outer space side of the sealing member. 【Background Art】 【0002】 For example, in a bearing device for a wheel of an automobile or the like, a sealing member that seals an annular space between an inner member and an outer member that rotate coaxially relative to each other is known. Since such a sealing member is provided in the annular space between the inner member and the outer member, it is directly exposed to foreign matters such as muddy water that attempt to invade from the outside and is frequently attacked, and there is a concern that foreign matters are caught between the seal lip and the slinger member, the seal lip wears, and the life is shortened. Therefore, in Patent Documents 1 to 3 below, the sealing member is protected by a member provided so as to cover the sealing member to suppress the invasion of foreign matters. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2004-325282 【Patent Document 2】 Japanese Patent Application Laid-Open No. 2015-071339 【Patent Document 3】 Japanese Patent Application Laid-Open No. 2015-137754 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 In the example shown in Patent Document 1, Figure 2, a cover (8) fitted to the small diameter portion (1ab) of the joint outer ring (1a) prevents the intrusion of foreign matter, thereby protecting the encoder (6) and the sealing member. In the example shown in Patent Document 2, Figure 2, a deflector (70) is fitted to the outer circumferential surface of the drive shaft (60). In the example shown in Patent Document 3, Figure 2, the cover (18) is press-fitted onto the inner ring (5), so that the outer diameter portion (18c) of the cover (18) covers the small diameter portion (2d) of the outer member (2), forming a labyrinth seal (19) between it and the support hole (7a) of the knuckle (7), thereby protecting the seal (10). 【0005】 However, in the example shown in Patent Document 1, Figure 2, if foreign matter crosses over the flange portion (8b) of the cover (8), the path to the encoder (6) and sealing member is a simple path without a structure that prevents further intrusion of the foreign matter, so there is a concern that the foreign matter will flow along the cover (8) and reach the encoder (6) and sealing member. Also, in the example shown in Patent Document 2, Figure 2, if foreign matter crosses over the radially outer end (72) of the deflector (70), the path is a simple path without a structure that prevents further intrusion of the foreign matter in the axial direction (direction of arrow Y), so there is a concern that the foreign matter will flow along the deflector (70) and reach the sealing member. 【0006】 In the example shown in Patent Document 3, Figure 2, if a foreign object passes through the labyrinth seal (19) and enters the cover (18), the labyrinth seal (21), which is formed by the seal lip (20) provided on the seal (10) and the ring portion (18b) of the cover (18), prevents further entry of the foreign object. However, if a foreign object passes through the labyrinth seal (21), the subsequent path is not complex in structure, raising concerns that the foreign object may reach the seal (10). Furthermore, even if the foreign object cannot pass through the labyrinth seal (21), there are concerns that the foreign object that has reached the cover (18) may not be smoothly discharged into the outside space due to the curved path created by the outer diameter portion (18c) of the cover member (18), the small diameter portion (2d) of the outer member (2), and the support hole (7a) of the knuckle (7). 【0007】 This invention has been made in view of the above circumstances, and aims to provide a sealing device that improves sealing performance with a cover member while also improving the ability to discharge foreign matter such as muddy water that enters. [Means for solving the problem] 【0008】 To achieve the above objective, the present invention provides a sealing device comprising an inner member and an outer member that rotate coaxially relative to each other, and a magnetic sensor, wherein the sealing device comprises a sealing member that seals an opening in an annular space between the inner member and the outer member, and a cover member provided on the external space side of the sealing member and covering the opening, wherein the sealing member and the cover member are constructed separately, and the sealing member comprises a slinger having a first cylindrical portion fitted into the inner member and a first disc portion extending radially outward from the axially outer end of the first cylindrical portion, a core body portion fitted into the outer member, and the core body portion The cover member comprises an elastic seal lip fixed to the slinger and elastically contacting the slinger, the cover member having a second disc portion facing the first disc portion of the slinger, a second cylindrical portion extending from the inner diameter side end of the second disc portion and having an outer peripheral surface located on the inner diameter side of the outer peripheral surface of the inner member, and a third disc portion provided on the inner diameter side of the second cylindrical portion, the second disc portion being positioned between the first disc portion and the magnetic sensor, and the third disc portion being sandwiched and fixed between the axially outer end face of the inner member and the opposing portion of the power shaft inserted into the inner diameter side of the inner member that faces the axially outer end face of the inner member. ,before The second disc portion, the first disc portion and a part of the axially outer end face of the inner member, and the second cylindrical portion are enclosed Then it forms the annular groove. It is characterized by the following: Furthermore, in order to achieve the above objective, another sealing device of the present invention is a bearing device comprising an inner member and an outer member that rotate coaxially relative to each other, and a magnetic sensor, wherein the sealing device comprises a sealing member that seals an opening in the annular space between the inner member and the outer member, and a cover member provided on the external space side of the sealing member and covering the opening, wherein the sealing member and the cover member are constructed as separate bodies, and the sealing member comprises a slinger having a first cylindrical portion fitted into the inner member and a first disc portion extending in the outer diameter direction from the axially outer end of the first cylindrical portion, a core body portion fitted into the outer member, and an elastic material fixed to the core body portion and elastically contacting the slinger The cover member comprises a seal lip and a second disc portion facing the first disc portion of the slinger, a second cylindrical portion extending from the inner diameter end of the second disc portion, and a third disc portion provided on the inner diameter side of the second cylindrical portion. The magnetic sensor is disposed between the first disc portion and the second disc portion, and the third disc portion is fixed by being sandwiched between the axially outer end face of the inner member and the opposing portion of the power shaft inserted into the inner diameter side of the inner member that faces the axially outer end face of the inner member. The second cylindrical portion is provided such that its outer circumferential surface is located on the inner diameter side of the outer circumferential surface of the inner member and a gap is formed between it and the outer circumferential surface of the power shaft. ,before The second disc portion, the first disc portion and a part of the axially outer end face of the inner member, and the second cylindrical portion are enclosed Then it forms an annular groove The second cylindrical portion is characterized by having a through hole that connects the gap between the outer surface of the power shaft and the second cylindrical portion with the annular groove. [Effects of the Invention] 【0009】 Since the sealing device of the present invention has the above-described configuration, the cover member improves the sealing performance while also improving the discharge performance of foreign matter such as muddy water that may enter. [Brief explanation of the drawing] 【0010】 [Figure 1] This is a schematic longitudinal cross-sectional view showing an example of a bearing device to which a sealing device according to the first embodiment of the present invention is attached. [Figure 2] This is an enlarged view of section X in Figure 1, and is a schematic longitudinal cross-sectional view illustrating a sealing device according to one embodiment of the present invention. [Figure 3] This is a schematic longitudinal cross-sectional view illustrating a modified example of the sealing device according to the first embodiment. [Figure 4] This is a schematic longitudinal cross-sectional view illustrating a sealing device according to a second embodiment of the present invention. [Figure 5] This is a schematic longitudinal cross-sectional view illustrating a modified example of the sealing device according to the second embodiment. [Modes for carrying out the invention] 【0011】 Embodiments of the present invention will be described below with reference to the drawings. Note that some of the detailed reference numerals used in other drawings have been omitted in some drawings. In the following description, in Figure 1, the right side is the vehicle body side and the left side is the wheel side. In Figures 2 to 5, the right side is the vehicle body side, the external space side, and the outer side in the axial direction, and the left side is the wheel side, the annular space S side, and the inner side in the axial direction. 【0012】 The sealing device 10 shown in this embodiment is mounted on a bearing device 1 having an inner member (5) and an outer member (2) that rotate coaxially relative to each other. The sealing device 10 comprises a seal member 11 that seals the opening of the annular space S between the inner member (5) and the outer member (2), and a cover member 16 provided on the outer space side of the seal member 11 and covering the opening. The seal member 11 comprises a slinger 12 having a first cylindrical portion 120 that fits into the inner member (5) and a first disc portion 121 extending radially outward from the axially outer end 120a of the first cylindrical portion 120, a core body portion 13 that fits into the outer member (5), and an elastic seal lip 141 fixed to the core body portion 13 and elastically contacting the slinger 12. The sealing device 10, with the cover member 16 and the first disc portion 121 of the slinger 12, constitutes an annular groove portion 18. A detailed explanation follows below. 【0013】 <First Embodiment> First, the sealing device 10 according to the first embodiment will be described with reference to Figures 1 and 2. Figure 1 shows a bearing device 1 that supports an automobile wheel (not shown) so that it can rotate on an axis. This bearing device 1 is broadly composed of an outer ring 2 corresponding to the outer member described above, an inner ring 5 corresponding to the inner member described above, and two rows of rolling elements (balls) 6 interposed between the outer ring 2 and the inner ring 5. The inner ring 5 is composed of a hub ring 3 and an inner ring member 4 as a rotating member, and the inner ring member 4 is fitted integrally with the vehicle body side of the hub ring 3. A drive shaft 7 is coaxially spline-fitted to the hub ring 3, and the drive shaft 7 is connected to a drive source (drive transmission unit) not shown via a constant velocity joint 8. The drive shaft 7 is integrated with the hub ring 3 by a nut 71, preventing the hub ring 3 from falling off the drive shaft 7. The inner ring 5 (hub ring 3 and inner ring member 4) is a rotating member that can rotate around the axis L relative to the outer ring 2. The outer ring 2 and the inner ring 5 form two members that rotate relative to each other, forming an annular space S. Within the annular space S, two rows of rolling elements 6... are interposed so as to be able to roll on the raceway 2a of the outer ring 2, and the raceway 3a and 4a of the hub ring 3 and inner ring member 4, while being held by a retainer 6a. The hub ring 3 has a cylindrical hub ring body 30 and a hub flange 32 formed to extend radially outward from the hub ring body 30 via a rising base 31. The wheel is attached and fixed to the hub flange 32 by bolts 33 and nuts (not shown). 【0014】 The outer ring 2 has an outer ring flange 21 formed to extend radially outward from its outer circumferential surface 2b. The outer ring 2 is attached and fixed to the knuckle 9 by the outer ring flange 21. The knuckle 9 has a cylindrical portion 90, the wheel-side surface 90a of the cylindrical portion 90 abuts against the vehicle-side surface 21a of the outer ring flange 21, and a portion of the wheel-side inner circumferential surface 90b of the cylindrical portion 90 fits into the outer circumferential surface 2b of the outer ring 2. A magnetic sensor G is attached and fixed to the cylindrical portion 90 of the knuckle 9, and by being attached and fixed to the knuckle 9, the magnetic sensor G is positioned to face the magnetic encoder provided in the sealing device 10. 【0015】 Figure 2 is a partial cross-sectional view showing an enlarged portion of the X portion in Figure 1, and Figure 2 shows a sealing device 10 according to the first embodiment. The sealing device 10 is attached to the ends of the outer ring 2 and the inner ring member 4 on the vehicle body side, and includes a seal member 11 that seals the opening of the annular space S between the outer ring 2 and the inner ring member 4, and a cover member 16 provided on the outer space side (vehicle body side, outer in the axial direction) of the seal member 11 to cover the opening. First, the seal member 11 will be described. 【0016】 The seal member 11 is configured by combining a slinger 12, a core body portion 13, and a seal lip member 14 having a seal lip 141. The slinger 12 is formed by pressing a steel plate such as SPCC or SUS, and as shown in Figure 2, it has a cylindrical shape with a substantially L-shaped cross-section on one side. The slinger 12 has a first cylindrical portion 120 that fits onto the outer peripheral surface 4b of the inner ring member 4, and a first disc portion 121 that extends in the outer diameter direction from the end portion 120a on the outer side in the axial direction of the first cylindrical portion 120. 【0017】 An annular magnetic encoder 15 with N poles and S poles magnetized alternately in the circumferential direction is provided on the outer surface 121a in the axial direction of the first disc portion 121 of the slinger 12. The magnetic encoder 15 is arranged to face a magnetic sensor G attached and fixed to the knuckle 9 via a second disc portion 161 of a cover member 16 described later. The magnetic sensor G can detect the rotational speed etc. of the bearing device 1 by detecting the magnetic change of the magnetic encoder 15. 【0018】 The core body portion 13 is formed by pressing a steel plate such as SPCC or SUS, and as shown in Figure 2, it has a cylindrical shape with a substantially reverse L-shaped cross-section on one side. The core body portion 13 has a core cylindrical portion 130 that fits onto the inner peripheral surface 2c of the outer ring 2, and a core disc portion 131 that extends in the inner diameter direction from the end portion 130a on the annular space S side (inner in the axial direction) of the core cylindrical portion 130. 【0019】 A seal lip member 14 is fixed to the core body portion 13, and the seal lip member 14 is equipped with an elastic seal lip 141 that elastically contacts the slinger 12. The seal lip member 14 is made of an elastic material such as rubber and has a seal lip base portion 140 that is vulcanized and bonded to the core body portion 13, and a plurality of seal lips 141 that extend from the seal lip base portion 140 and elastically contact the slinger 12. The seal lip member 14 of this embodiment has three seal lips 141: a side lip that extends while expanding in diameter axially outward and elastically contacts the first disc portion 121 of the slinger 12, a first radial lip that extends while contracting in diameter axially outward and elastically contacts the first cylindrical portion 120 of the slinger 12, and a second radial lip that extends while contracting in diameter toward the annular space S and elastically contacts the first cylindrical portion 120 of the slinger 12. 【0020】 The sealing member 11 prevents foreign matter such as muddy water from entering the annular space S by sealing the axially outer opening of the annular space S between the outer ring 2 and the inner ring member 4. Furthermore, the sealing member 11 is equipped with a sealing lip 141 that elastically contacts the slinger 12, which further improves the sealing performance and further suppresses the entry of foreign matter into the internal space (annular space S side) beyond the sealing lip 141. On the axially outer side of the sealing member 11, which is the external space side, a cover member 16 is provided to cover the opening of the annular space S, and the cover member 16 and the first disc portion 121 of the slinger 12 form an annular groove portion 18. The sealing device 10 has improved sealing performance by being equipped with the cover member 16 and the annular groove portion 18 in addition to the sealing member 11. Next, the configuration of the cover member 16 will be described in detail. 【0021】 The cover member 16 is made of a non-magnetic material and is provided between the magnetic sensor G and the magnetic encoder 15 provided on the first disc portion 121 of the slinger 12. The cover member 16 comprises a second disc portion 161, a second cylindrical portion 162, and a third disc portion 163. The second disc portion 161 is formed in a disc shape that extends radially and faces the first disc portion 121 of the slinger 12 with a gap between them, and its axially inner surface 161a constitutes one side surface of the annular groove portion 18. Furthermore, the outer diameter side end 161b of the second disc portion 161 is located on the outer diameter side of the inner circumferential surface 2c of the outer ring 2 and is close to the inner circumferential surface 90b of the cylindrical portion 90 of the knuckle 9 with a gap between them. 【0022】 The second cylindrical portion 162 of the cover member 16 is formed extending axially inward from the inner diameter end 161c of the second disc portion 161, and constitutes the bottom surface of the annular groove portion 18. The outer circumferential surface 162a of this second cylindrical portion 162 is located on the inner diameter side than the outer circumferential surface 4b of the inner ring member 4. 【0023】 The third disc portion 163 of the cover member 16 extends inward from the axially inner end 162b of the second cylindrical portion 162 and is formed in a disc shape, and is located on the inner diameter side of the second cylindrical portion 162. The third disc portion 163 is sandwiched and fixed between the axially outer end face 4c of the inner ring member 4 and the opposing portion 81 of the constant velocity joint 8, which is integrated with the power shaft (drive shaft 7) inserted into the inner diameter side of the inner ring 5, and the axially outer end face 4c of the inner ring member 4. By sandwiching and fixing the third disc portion 163, the cover member 16 is fixed to the bearing device 1 with the annular groove portion 18, which will be described later, formed. 【0024】 The cover member 16 is provided on the external space side of the seal member 11 and covers the opening of the annular space S, thereby improving the sealing performance of the sealing device 10. Furthermore, the cover member 16 has a second disc portion 161 that faces the first disc portion 121 of the slinger 12, which suppresses direct exposure and attack of the first disc portion 121 by foreign matter such as muddy water entering from the outside. In addition, the outer diameter end 161b of the second disc portion 161 of the cover member 16 is located on the outer diameter side of the inner circumferential surface 2c of the outer ring 2 and is close to the inner circumferential surface 90b of the cylindrical portion 90 of the knuckle 9, thus narrowing the gap between the outer diameter end 161b of the second disc portion 161 and the inner circumferential surface 90b of the cylindrical portion 90 of the knuckle 9, which would otherwise be a path for muddy water to enter, making it difficult for muddy water to enter. Furthermore, since the cover member 16 is made of a non-magnetic material, it is less likely to interfere with the detection of magnetic changes by the magnetic encoder 15 by the magnetic sensor G. Furthermore, since the second disc portion 161 covers the magnetic encoder 15, the cover member 16 can protect the magnetic encoder 15 from dust and other debris. 【0025】 Furthermore, an annular groove 18 is provided on the axially outer side of the seal member 11, which is the side facing the external space, and is composed of the cover member 16 and the first disc portion 121 of the slinger 12. More specifically, the annular groove 18 is a concave groove composed of multiple members, enclosed by the axially outer end face 4c of the inner ring member 4 and the first disc portion 121 (magnetic encoder 15) of the slinger 12, the outer peripheral surface 162a of the second cylindrical portion 162 of the cover member 16, and the axially inner surface 161a of the second disc portion 161. By providing the annular groove 18 on the axially outer side of the seal member 11, foreign matter such as muddy water that enters from the external space side (axially outer side) can be retained in the annular groove 18 before reaching the seal member 11. The foreign matter retained in the annular groove 18 can then be easily discharged, combined with the discharge effect caused by the rotation of the bearing device 1. 【0026】 Furthermore, since the annular groove 18 is formed on one side by the second disc portion 161 of the cover member 16, foreign matter accumulated in the annular groove 18 is easily discharged to the outside space by the centrifugal force generated by the rotation of the bearing device 1, which travels along the second disc portion 161. In addition, the outer circumferential surface 162a of the second cylindrical portion 162 of the cover member 16, which forms the bottom surface of the annular groove 18, is located on the inner diameter side than the outer circumferential surface 4b of the inner ring member 4, so that the annular groove 18 is formed to include the axially outer end face 4c of the inner ring member 4. Therefore, since the outer circumferential surface 162a of the second cylindrical portion 162 is located on the inner diameter side than the outer circumferential surface 4b of the inner ring member 4, the volume of the annular groove 18 that accumulates foreign matter such as muddy water can be increased, and the intrusion of foreign matter such as muddy water into the opening side of the annular space S, which is to be sealed, can be suppressed. 【0027】 Furthermore, as shown by the dashed arrow in Figure 2, foreign matter such as muddy water that enters from the external space side branches into two entry paths: one towards the second cylindrical portion 162, which is the bottom surface of the cover member 16, and the other towards the seal member 11 side. At least a portion of the foreign matter such as muddy water that enters from the external space side accumulates in the annular groove portion 18 toward the second cylindrical portion 162, thus reducing the amount of foreign matter that reaches the seal lip 141 of the seal member 11. 【0028】 Furthermore, foreign matter such as muddy water that travels along the outer surface of the constant velocity joint 8 reaches the space surrounded by the constant velocity joint 8 and the second cylindrical portion 162 and the third disc portion 163 of the cover member 16, thus preventing it from entering the cover member 16. 【0029】 <Modified form of the first embodiment> Next, we will describe a modified version of the sealing device 10 shown in Figure 2, called sealing device 10', with reference to Figure 3. Note that we will omit the explanation of the configuration and effects of parts common to both the sealing device 10 in Figure 2 and the sealing device 10 in Figure 2. The sealing device 10' in Figure 3 differs from the sealing device 10 in Figure 2 in that the slinger 12 of the sealing member 11 does not have a magnetic encoder 15, and the cover member 16 has an annular magnetic encoder 17. The cover member 16 has an annular magnetic encoder 17 provided on the axially outer surface 161d of the second disc portion 161, which is positioned opposite the magnetic sensor G. Even without a magnetic encoder 15 on the slinger 12, the magnetic sensor G can detect the rotational speed of the bearing device 1 by detecting the magnetic change of the magnetic encoder 17 provided on the cover member 16. Furthermore, since the magnetic encoder 17 is provided on the axially outer surface 161d of the second disc portion 161 of the cover member 16, the magnetic encoder 17 and the magnetic sensor G can be placed in close proximity, thereby improving detection accuracy. 【0030】 <Second Embodiment> Next, we will describe the sealing device 10A according to the second embodiment shown in Figure 4. Note that the configuration and effects of parts common to the first embodiment will be omitted. The sealing device 10A has substantially the same configuration as the sealing member 11 in the first embodiment, but the configuration of the cover member 16 differs from that of the first embodiment. 【0031】 The cover member 16 includes a second disc portion 161, a second cylindrical portion 162, a third disc portion 163, and an external space side cylindrical portion 164 extending axially outward from the outer diameter side end 161b of the second disc portion 161. The external space side cylindrical portion 164 forms a labyrinth R that extends axially in close proximity to the inner circumferential surface 90b of the cylindrical portion 90 of the knuckle 9, with a gap between them. The formation of the labyrinth R prevents foreign matter such as muddy water from entering the annular groove portion 18 due to the long labyrinth length. 【0032】 Furthermore, the second cylindrical portion 162 has a different configuration from that of the first embodiment. The second cylindrical portion 162 is formed to extend axially outward compared to that of the first embodiment, and the magnetic sensor G is positioned between the second disc portion 161 of the cover member 16 and the first disc portion 121 of the slinger 12. In other words, in this embodiment, the magnetic sensor G is positioned inserted into the annular groove portion 18. 【0033】 Furthermore, the second cylindrical portion 162 is provided with through holes 162c. The number of through holes 162c provided in the second cylindrical portion 162 is not particularly limited, but it is desirable that multiple through holes 162c be provided at intervals along the circumferential direction of the second cylindrical portion 162. 【0034】 The annular groove 18 is a concave groove composed of multiple members, enclosed by the axially outer end face 4c of the inner ring member 4, the first disc portion 121 of the slinger 12, the outer circumferential surface 162a of the second cylindrical portion 162 of the cover member 16, and the axially inner surface 161a of the second disc portion 161 of the cover member 16. Since the second cylindrical portion 162, which constitutes the bottom surface of this annular groove 18, is provided with a through hole 162c, foreign matter such as muddy water that reaches the second cylindrical portion 162 can be easily discharged to the outside through the through hole 162c, as shown by the dashed arrow in Figure 4. The through hole 162c prevents foreign matter such as muddy water from entering the opening side of the annular space S that is to be sealed. 【0035】 The sealing device 10A has an annular groove 18 with a large groove width so that the magnetic sensor G is positioned between the second disc portion 161 of the cover member 16 and the first disc portion 121 of the slinger 12. Furthermore, since the groove width of the annular groove 18 is larger than that of the first embodiment, the volume of the annular groove 18 is also larger than that of the first embodiment, making it easier for foreign matter such as muddy water to accumulate in the annular groove 18. The foreign matter accumulated in the annular groove 18 can then be easily discharged, in conjunction with the discharge effect caused by the rotation of the bearing device 1. In addition, since a through hole 162c is provided in the second cylindrical portion 162, which is the bottom surface of the annular groove 18, foreign matter accumulated in the annular groove 18 can be easily discharged to the outside through the through hole 162c even before it is discharged by the rotation of the bearing device 1. 【0036】 Furthermore, a magnetic encoder 15 is provided on the first disc portion 121 of the slinger 12, and a magnetic sensor G is positioned between the second disc portion 161 of the cover member 16 and the first disc portion 121 of the slinger 12. As a result, the magnetic encoder 15 and the magnetic sensor G can be positioned in close proximity, thereby improving detection accuracy. In addition, the cover member 16 can protect the magnetic sensor G and the magnetic encoder 15 from dust and other particles from the outside. 【0037】 <Modified form of the second embodiment> Next, we will describe a modified version of the sealing device 10A in Figure 4, namely the sealing device 10A', with reference to Figure 5. Note that we will omit the explanation of the configuration and effects of parts common to the sealing device 10A in Figure 4. The sealing device 10A' in Figure 5 differs from the sealing device 10A in Figure 4 in that the slinger 12 of the sealing member 11 does not have a magnetic encoder 15, and the cover member 16 has a magnetic encoder 17. The cover member 16 has an annular magnetic encoder 17 provided on the axially inner surface 161a of the second disc portion 161, which is positioned opposite the magnetic sensor G. Because the cover member 16 is equipped with a magnetic encoder 17, the rotational speed of the bearing device 1 can be detected by the magnetic sensor G detecting the magnetic change of the magnetic encoder 17. 【0038】 Furthermore, a magnetic encoder 17 is provided on the second disc portion 161 of the cover member 16, and a magnetic sensor G is positioned between the second disc portion 161 of the cover member 16 and the first disc portion 121 of the slinger 12. As a result, the magnetic encoder 17 and the magnetic sensor G can be positioned in close proximity, thereby improving detection accuracy. In addition, the cover member 16 can protect the magnetic sensor G and the magnetic encoder 17 from dust and other particles from the outside. 【0039】 The bearing device 1 has a mounting recess 301 recessed toward the outer diameter at the vehicle body side end of the inner circumferential surface 30a of the hub wheel body 30 of the hub wheel 3. The cover member 16 is provided on the inner diameter side of the second cylindrical portion 162 and has a third cylindrical portion 165 that is fitted and fixed to the inner circumferential surface 301a of the mounting recess 301. 【0040】 The third cylindrical portion 165 of the cover member 16 is formed extending axially inward from the inner diameter end 163a of the third disc portion 163, which is formed extending inward from the axially inward end 162b of the second cylindrical portion 162. The cover member 16 is configured such that the third cylindrical portion 165, provided on the inner diameter side of the second cylindrical portion 162, is fitted and fixed into the inner circumferential surface 301a of the mounting recess 301, which is part of the inner circumferential surface of the inner member. Therefore, when the magnetic encoder 17 is placed on the second disc portion 161 of the cover member 16, the concentricity between the cover member 16 and the drive shaft 7, which is the power shaft, can be easily increased, and the rotation of the magnetic encoder 17 and the rotation of the drive shaft 7 can be matched to further increase the detection accuracy of the magnetic sensor G. 【0041】 Furthermore, the sealing devices 10, 10', 10A, and 10A' described above are not limited to the shapes and configurations shown in the drawings. For example, the configuration of the sealing member 11 is not limited to those described above, and the number and shape of the sealing lips 141 and other components constituting the sealing member 11 are not limited to the shapes shown in the drawings. Similarly, the configuration of the cover member 16 is not limited to those shown in the drawings; for example, a through hole may be provided in the cylindrical portion 164 on the external space side. Also, in the embodiments described above, the outer circumferential surface 162a of the second cylindrical portion 162 of the cover member 16 is located on the inner diameter side of the outer circumferential surface 4b of the inner ring member 4, but this is not limited to that. It may be located at approximately the same radial position as the outer circumferential surface 4b of the inner ring member 4, or it may be located on the outer diameter side of the outer circumferential surface 4b of the inner ring member 4. If the outer circumferential surface 162a of the second cylindrical portion 162 is located on the outer diameter side of the outer circumferential surface 4b of the inner ring member 4, the third disc portion 163 will come into contact with the first disc portion 121 of the slinger 12. Therefore, if the magnetic encoder 15 is located on the first disc portion 121, there is a risk that it will come into contact with the second cylindrical portion 162. For this reason, in such cases, it is desirable to provide the magnetic encoder 17 on the second disc portion 161 of the cover member 16 instead of providing the magnetic encoder 15 on the first disc portion 121. In addition, in each of the embodiments described above, the third disc portion 163 of the cover member 16 is in contact with and clamped against the axially outer end face 4c of the inner ring member 4, but it may also be in contact with the axially outer end face of the hub wheel 3 and clamped and fixed between the hub wheel 3 and the opposing portion 81 of the axially outer end face of the hub wheel 3 in the constant velocity joint 8. [Explanation of Symbols] 【0042】 1. Bearing device 2. Outer ring (outer member) 3. Hub wheel (inner wheel) 30 Hub Wheel Body 301 Mounting recess 301a Inner surface 4. Inner ring member (inner ring) 4b Outer surface 4c Axial outer end face 5. Inner ring (inner component) 7. Drive shaft 8 constant velocity joints 81 Opposite part 9 Knuckle 10,10',10A,10A' Sealing device 11. Sealing member 12 Slinger 120 First cylindrical section 120a Outer end in the axial direction 121 First disc section 121a Axial outer surface 13 Core body part 14 Seal lip member 141 Seal Lip 15,17 Magnetic encoder 16 Cover component 161 Second disc section 161a Inner surface in the axial direction 161c Inner diameter end 161d Axial outer surface 162 Second cylindrical section 162a Outer surface 162b Inward end in the axial direction 162c through hole 163 Third disc section 165 Third cylindrical section 18 Annular groove G Magnetic Sensor S-shaped circular space
Claims
[Claim 1] A bearing device comprising an inner member and an outer member that rotate relatively coaxially, and a magnetic sensor, wherein the sealing device comprises a sealing member that seals the opening of the annular space between the inner member and the outer member, and a cover member provided on the external space side of the sealing member to cover the opening, The sealing member and the cover member are constructed as separate components. The sealing member comprises a slinger having a first cylindrical portion fitted into the inner member and a first disc portion extending radially outward from the axially outer end of the first cylindrical portion, a core portion fitted into the outer member, and an elastic sealing lip fixed to the core portion and elastically contacting the slinger. The cover member has a second disc portion facing the first disc portion of the slinger, a second cylindrical portion extending from the inner diameter side end of the second disc portion and having an outer peripheral surface located on the inner diameter side than the outer peripheral surface of the inner member, and a third disc portion provided on the inner diameter side of the second cylindrical portion. The second disc portion is positioned between the first disc portion and the magnetic sensor. The third disc portion is sandwiched and fixed between the axially outer end face of the inner member and the opposing portion of the power shaft, which is inserted into the inner diameter side of the inner member, that faces the axially outer end face of the inner member. A sealing device characterized in that an annular groove is formed by enclosing the second disc portion, the first disc portion and a part of the axially outer end face of the inner member, and the second cylindrical portion. [Claim 2] A bearing device comprising an inner member and an outer member that rotate relatively coaxially, and a magnetic sensor, wherein the sealing device comprises a sealing member that seals the opening of the annular space between the inner member and the outer member, and a cover member provided on the external space side of the sealing member and covering the opening, The sealing member and the cover member are constructed as separate components. The sealing member comprises a slinger having a first cylindrical portion fitted into the inner member and a first disc portion extending radially outward from the axially outer end of the first cylindrical portion, a core portion fitted into the outer member, and an elastic sealing lip fixed to the core portion and elastically contacting the slinger. The cover member has a second disc portion facing the first disc portion of the slinger, a second cylindrical portion extending from the inner diameter end of the second disc portion, and a third disc portion provided on the inner diameter side of the second cylindrical portion. The magnetic sensor is positioned between the first disc portion and the second disc portion. The third disc portion is sandwiched and fixed between the axially outer end face of the inner member and the opposing portion of the power shaft, which is inserted into the inner diameter side of the inner member, that faces the axially outer end face of the inner member. The second cylindrical portion is provided such that its outer circumferential surface is located on the inner diameter side of the outer circumferential surface of the inner member, and a gap is formed between it and the outer circumferential surface of the power shaft. The annular groove is formed by enclosing the second disc portion, the first disc portion and a part of the axially outer end face of the inner member, and the second cylindrical portion. The sealing device is characterized in that the second cylindrical portion is provided with a through hole that connects the gap between the outer surface of the power shaft and the second cylindrical portion with the annular groove portion. [Claim 3] In claim 1, A sealing device characterized in that the second cylindrical portion of the cover member is provided with a through hole. [Claim 4] In any one of claims 1 to 3, The sealing device is characterized in that the second disc portion has an outer diameter end that is located on the outer diameter side of the inner circumferential surface of the outer member and is close to the inner circumferential surface of the knuckle that attaches and fixes the outer member, with a gap between them. [Claim 5] In any one of claims 1 to 4, A sealing device characterized in that an annular magnetic encoder is provided on the axially outer surface of the first disc portion of the slinger, facing the magnetic sensor. [Claim 6] In claim 5, The sealing device is characterized in that the cover member is made of a non-magnetic material. [Claim 7] In any one of claims 1 to 4, The sealing device is characterized in that the cover member is provided with an annular magnetic encoder positioned opposite the magnetic sensor on the axially outer or axially inner surface of the second disc portion. [Claim 8] In any one of claims 1 to 7, The cover member has a third cylindrical portion provided on the inner diameter side of the second cylindrical portion, The sealing device is characterized in that the third cylindrical portion is fitted and fixed to the inner circumferential surface of the inner member.