JP2023150828A - Seal device - Google Patents

Abstract

To provide a seal device which achieves improvement of an ability for discharging foreign objects, such as mud water, entering the device while improving sealability with a cover member.SOLUTION: A seal device 10 includes: a seal member 11 which seals an opening of an annular space S between an inner member and an outer member in a bearing device 1 including the inner member and the outer member which coaxially rotate relative to each other; and a cover member 16 which is provided at the exterior space side of the seal member and covers the opening. The seal member includes: a slinger 12 having a first cylindrical part 120 fitted in the inner member, and a first circular disc part 121 extending from an end 120a at the axial outer side in an outer diameter direction at the first cylindrical part; a core body part 13 fitted in the outer member; and a seal lip 141 which is fastened to the core body part, elastically contacts with the slinger, and is formed of an elastic body. The cover member and the first circular disc part of the slinger form an annular groove part 18.SELECTED DRAWING: Figure 2

Description

The present invention relates to a sealing device that includes a sealing member that seals an annular space between an inner member and an outer member that rotate relatively coaxially, and a cover member provided on the outside space side of the sealing member.

For example, a seal member is known in a bearing device for a wheel of an automobile or the like, which seals an annular space between an inner member and an outer member that rotate relatively coaxially. Since such a seal member is provided in the annular space between the inner member and the outer member, it is directly exposed to and frequently attacked by foreign substances such as muddy water that try to enter from the outside, and the foreign substances may contact the seal lip. There is a concern that the seal lip may get caught between the seal lip and the slinger member, causing wear of the seal lip and shortening its life. Therefore, in Patent Documents 1 to 3 listed below, the seal member is protected by a member provided to cover the seal member to suppress the intrusion of foreign substances.

Japanese Patent Application Publication No. 2004-325282 Japanese Patent Application Publication No. 2015-071339 Japanese Patent Application Publication No. 2015-137754

In the example of Patent Document 1 and FIG. 2, the cover (8) fitted to the small diameter portion (1ab) of the joint outer ring (1a) suppresses the intrusion of foreign matter and protects the encoder (6) and the seal member. There is. Moreover, in the example of Patent Document 2 and FIG. 2, a deflector (70) fitted to the outer peripheral surface of the drive shaft (60) is provided. In the example of FIG. 2 of Patent Document 3, by press-fitting the cover (18) into the inner ring (5), the outer diameter portion (18c) of the cover (18) is replaced by the small diameter portion (2d) of the outer member (2). ) to protect the seal (10) by forming a labyrinth seal (19) between it and the support hole (7a) of the knuckle (7).

However, in the example of Patent Document 1 and FIG. 2, if a foreign object climbs over the flange portion (8b) of the cover (8), the path to the encoder (6) and the seal member prevents further intrusion of the foreign object. Since the path is simple and does not have a suppressing structure, there is a concern that foreign matter may flow along the cover (8) and reach the encoder (6) or the seal member. In addition, in the example of Patent Document 2 and FIG. 2, if the foreign object climbs over the radially outer end (72) of the deflector (70), further intrusion of the foreign object in the axial direction (direction of arrow Y) is prevented. Since the path is simple and does not have a suppressing structure, there is a concern that foreign objects may reach the sealing member along the deflector (70).

In the example of FIG. 2 of Patent Document 3, when a foreign object passes through the labyrinth seal (19) and enters the cover (18), the seal lip (20) provided on the seal (10) and the cover ( The labyrinth seal (21) formed by the circular ring part (18b) of 18) suppresses further intrusion of foreign matter. However, if a foreign object passes through the labyrinth seal (21), the subsequent path does not have a complicated structure, and there is a concern that the foreign object will reach the seal (10). Furthermore, even if foreign matter cannot pass through the labyrinth seal (21), 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), there is a concern that foreign matter that has reached the inside of the cover (18) may not be smoothly discharged to the external space due to the curved path.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sealing device that improves the sealing performance by a cover member and also improves the performance of discharging foreign substances such as muddy water that enters the device.

In order to achieve the above object, the sealing device of the present invention is provided in a bearing device including an inner member and an outer member that rotate relatively coaxially. A sealing device comprising a sealing member for sealing, and a cover member provided on an external space side of the sealing member and covering the opening, the sealing member comprising: a first cylindrical portion fitted into the inner member; a slinger having a first disk portion extending in the outer diameter direction from an axially outer end in the first cylindrical portion; a core portion fitted to the outer member; and a slinger fixed to the core portion. and a seal lip made of an elastic body that makes elastic contact with the slinger, and the cover member and the first disk portion of the slinger form an annular groove portion.

Since the sealing device of the present invention has the above-described configuration, the cover member improves the sealing performance and also improves the discharge performance of foreign substances such as muddy water that enters.

1 is a schematic vertical sectional view showing an example of a bearing device to which a sealing device according to a first embodiment of the present invention is mounted. FIG. 2 is an enlarged view of section X in FIG. 1 and a schematic vertical sectional view schematically showing a sealing device according to an embodiment of the present invention. It is a schematic longitudinal cross-sectional view which shows typically the modification of the sealing device based on 1st Embodiment. FIG. 3 is a schematic vertical sectional view schematically showing a sealing device according to a second embodiment of the present invention. It is a schematic longitudinal cross-sectional view which shows typically the modification of the sealing device based on 2nd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings. Note that in some of the figures, some detailed symbols attached to other figures are omitted. In addition, in the following explanation, on the paper of FIG. 1, the right side is the vehicle body side and the left side is the wheel side, and on the paper of FIGS. 2 to 5, the right side is the vehicle body side, the external space side, and the outer side in the axial direction. The left side is the wheel side, the annular space S side, and the inner side in the axial direction.

The sealing device 10 shown in this embodiment is attached to a bearing device 1 that includes an inner member (5) and an outer member (2) that rotate relatively coaxially. The sealing device 10 includes a seal member 11 that seals the opening of an annular space S between the inner member (5) and the outer member (2), and a cover member that is provided on the external space side of the seal member 11 and covers the opening. 16. The sealing member 11 includes a slinger 12 having a first cylindrical portion 120 fitted into the inner member (5) and a first disc portion 121 extending in the outer radial direction from an axially outer end 120a of the first cylindrical portion 120. , a core body part 13 that is fitted into the outer member (5), and a seal lip 141 made of an elastic body that is fixed to the core body part 13 and comes into elastic contact with the slinger 12. In the sealing device 10, the cover member 16 and the first disk portion 121 of the slinger 12 constitute an annular groove portion 18. This will be explained in detail below.

<First embodiment>
First, a sealing device 10 according to a first embodiment will be described with reference to FIGS. 1 and 2.
FIG. 1 shows a bearing device 1 that rotatably supports wheels (not shown) of an automobile. This bearing device 1 generally includes an outer ring 2 corresponding to the above-mentioned outer member, an inner ring 5 corresponding to the above-mentioned inner member, and two rows of rolling elements interposed between the outer ring 2 and the inner ring 5. (Ball) 6... The inner ring 5 is configured as a rotating member by the hub ring 3 and the inner ring member 4, and the inner ring member 4 is integrally fitted to the vehicle body side of the hub ring 3. A drive shaft 7 is coaxially spline-fitted to the hub wheel 3, and the drive shaft 7 is connected to a drive source (drive transmission section) not shown through a constant velocity joint 8. The drive shaft 7 is integrated with the hub wheel 3 by a nut 71, and the hub wheel 3 is prevented from falling off from the drive shaft 7. The inner ring 5 (hub ring 3 and inner ring member 4) is a rotating member that can rotate around an axis L with respect to the outer ring 2, and the outer ring 2 and the inner ring 5 constitute two members that rotate relatively. , an annular space S is formed. In the annular space S, two rows of rolling elements 6... are held in a retainer 6a, and the bearing rings 2a of the outer ring 2, the hub ring 3, and the bearing rings 3a and 4a of the inner ring member 4 can roll. It has been intervened. 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 an upright base 31. The wheels are attached and fixed by bolts 33 and nuts (not shown).

The outer ring 2 has an outer ring flange 21 formed to extend radially outward from the outer peripheral surface 2b. The outer ring 2 is attached and fixed to the knuckle 9 by an outer ring flange 21. The knuckle 9 has a cylindrical portion 90, a wheel side surface 90a of the cylindrical portion 90 abuts the vehicle body side surface 21a of the outer ring flange 21, and a part of the inner circumferential surface 90b of the cylindrical portion 90 on the wheel side contacts the outer ring flange 21. It fits into the outer circumferential surface 2b of. A magnetic sensor G is attached and fixed to a cylindrical portion 90 of the knuckle 9, and the magnetic sensor G is attached and fixed to the knuckle 9, so that it is arranged to face a magnetic encoder provided in the sealing device 10.

FIG. 2 is an enlarged partial sectional view of the X section in FIG. 1, and FIG. 2 shows the 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 seal member 11 that seals the opening of the annular space S between the outer ring 2 and the inner ring member 4. A cover member 16 is provided on the space side (vehicle body side, outer side in the axial direction) and covers the opening. First, the seal member 11 will be explained.

The seal member 11 is constructed by combining a slinger 12, a core portion 13, and a seal lip member 14 including a seal lip 141. The slinger 12 is formed by pressing a steel plate such as SPCC or SUS, and has a cylindrical shape with one side having a substantially L-shaped cross section as shown in FIG. The slinger 12 includes a first cylindrical portion 120 that is fitted onto the outer peripheral surface 4b of the inner ring member 4, and a first disk portion 121 that extends in the outer radial direction from the axially outer end 120a of the first cylindrical portion 120. have

An annular magnetic encoder 15 is provided on the axially outer surface 121a of the first disk portion 121 of the slinger 12, and the annular magnetic encoder 15 has N poles and S poles alternately magnetized in the circumferential direction. The magnetic encoder 15 is disposed opposite to a magnetic sensor G fixedly attached to the knuckle 9 via a second disk portion 161 of a cover member 16, which will be described later. The magnetic sensor G can detect the rotational speed of the bearing device 1 and the like by detecting magnetic changes in the magnetic encoder 15 .

The core portion 13 is formed by pressing a steel plate such as SPCC or SUS, and has a cylindrical shape with one side having a substantially inverted L-shape in cross section, as shown in FIG. The core portion 13 includes a core cylindrical portion 130 that is fitted into the inner circumferential surface 2c of the outer ring 2, and a core that extends in the inner diameter direction from an end 130a of the core cylindrical portion 130 on the annular space S side (axially inner side). It has a body disc part 131.

A seal lip member 14 that includes a seal lip 141 made of an elastic material and that comes into elastic contact with the slinger 12 is fixed to the core portion 13 . The seal lip member 14 is made of an elastic body such as rubber, and includes a seal lip base 140 that is vulcanized and bonded to the core body 13 and a plurality of seal lips that extend from the seal lip base 140 and come into elastic contact with the slinger 12. 141. The seal lip member 14 of this embodiment has a side lip that extends outward in the axial direction while expanding in diameter and comes into elastic contact with the first disk portion 121 of the slinger 12, and a side lip that extends outward in the axial direction while decreasing in diameter and makes contact with the first disk portion 121 of the slinger 12. Three seal lips 141 are provided: a first radial lip that comes into elastic contact with the first cylindrical portion 120, and a second radial lip that extends toward the annular space S while reducing its diameter and comes into elastic contact with the first cylindrical portion 120 of the slinger 12.

The seal 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. Moreover, by including the seal lip 141 that comes into elastic contact with the slinger 12, the seal member 11 can further improve the sealing performance, and can further suppress the intrusion of foreign matter into the internal space side (the annular space S side) than the seal lip 141. Ru. A cover member 16 that covers the opening of the annular space S is provided on the outer side of the seal member 11 in the axial direction on the external space side, and the cover member 16 and the first disk portion 121 of the slinger 12 form an annular groove. 18 are configured. The sealing device 10 has a cover member 16 and an annular groove 18 in addition to the seal member 11, so that the sealing performance is further improved. Next, the structure of the cover member 16 will be explained in detail.

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 disk portion 121 of the slinger 12. The cover member 16 includes a second disc part 161, a second cylindrical part 162, and a third disc part 163. The second disk portion 161 is formed in a disk shape extending in the radial direction, faces the first disk portion 121 of the slinger 12 with a gap, and has an axially inner surface 161a located at one side of the annular groove portion 18. Make up the sides. In addition, the second disc portion 161 has an outer diameter end portion 161b located on the outer diameter side than the inner circumferential surface 2c of the outer ring 2, so that a gap is formed between the second disk portion 161 and the inner circumferential surface 90b of the cylindrical portion 90 of the knuckle 9. Set up and get close.

The second cylindrical portion 162 of the cover member 16 is formed to extend inward in the axial direction from the radially inner 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 the second cylindrical portion 162 is located on the inner diameter side of the outer circumferential surface 4b of the inner ring member 4.

The third disc part 163 of the cover member 16 is formed in a disc shape extending radially inward from the axially inner end 162b of the second cylindrical part 162, and is provided on the radially inner side than the second cylindrical part 162. It is being The third disc portion 163 is connected to the axially outer end surface 4c of the inner ring member 4 and the inner ring member 4 in 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. It is clamped and fixed between the axially outer end surface 4c and the opposing portion 81. By clamping and fixing the third disk portion 163, the cover member 16 is fixed to the bearing device 1 with an annular groove portion 18, which will be described later, being formed.

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. In addition, the cover member 16 is provided with a second disc part 161 that faces the first disc part 121 of the slinger 12, so that the first disc part 121 can be directly damaged by foreign matter such as muddy water that has entered from the outside. Being exposed and being attacked is suppressed. Further, in the cover member 16, the outer diameter side end 161b of the second disc portion 161 is located on the outer diameter side than 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. By doing so, the gap between the outer diameter side end 161b of the second disc part 161 and the inner circumferential surface 90b of the cylindrical part 90 of the knuckle 9, which serves as an intrusion route for muddy water, etc., becomes narrower, and muddy water etc. can enter. It becomes difficult. Further, since the cover member 16 is made of a non-magnetic material, it is less likely to inhibit the detection of magnetic changes of 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 the like.

Further, an annular groove portion 18 formed of the cover member 16 and the first disc portion 121 of the slinger 12 is provided on the axially outer side of the seal member 11 on the external space side. To explain in more detail, the annular groove portion 18 is formed between the axially outer end surface 4c of the inner ring member 4, the first disk portion 121 (magnetic encoder 15) of the slinger 12, and the outer peripheral surface 162a of the second cylindrical portion 162 of the cover member 16. and an axially inner surface 161a of the second disk portion 161, and is a concave groove portion made of a plurality of members. 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) is allowed to stay in the annular groove 18 before reaching the seal member 11. be able to. Thereafter, the foreign matter staying in the annular groove 18 can be easily discharged in conjunction with the discharge effect caused by the rotation of the bearing device 1.

Further, since one side surface of the annular groove portion 18 is constituted by the second disk portion 161 of the cover member 16, the centrifugal force generated by the rotation of the bearing device 1 is transmitted through the second disk portion 161 to the annular groove portion 18. Foreign matter that remains inside becomes easier to be discharged to the outside space. Further, the outer circumferential surface 162a of the second cylindrical portion 162 of the cover member 16 that constitutes the bottom surface of the annular groove portion 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 portion 18 It is formed with a configuration including an axially outer end surface 4c of No. 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 portion 18 in which foreign matter such as muddy water is retained can be increased, and the sealing target can be increased. Foreign matter such as muddy water can be prevented from entering the opening side of a certain annular space S.

Furthermore, as shown by the two-dot chain arrow in FIG. 2, foreign matter such as muddy water that has entered from the outside space has two paths: one toward the second cylindrical portion 162, which is the bottom surface of the cover member 16, and the other toward the sealing member 11. The intrusion route is branched. Since at least a part of foreign matter such as muddy water that has entered from the external space side moves toward the second cylindrical portion 162 and stays in the annular groove portion 18, it is possible to reduce the amount of foreign matter that moves toward the seal lip 141 of the seal member 11. can.

In addition, foreign matter such as muddy water that has traveled along the outer peripheral 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 disk portion 163 of the cover member 16. Intrusion into the cover member 16 is suppressed.

<Modified example of the first embodiment>
Next, a sealing device 10', which is a modification of the sealing device 10 shown in FIG. 2, will be described with reference to FIG. 3. Note that explanations of the configuration and effects of parts common to the sealing device 10 of FIG. 2 will be omitted.
The sealing device 10' of FIG. 3 differs from the sealing device 10 of FIG. 2 in that the slinger 12 of the sealing member 11 does not include the magnetic encoder 15, and the cover member 16 includes an annular magnetic encoder 17. In the cover member 16, an annular magnetic encoder 17 is provided on the axially outer surface 161d of the second disc portion 161, and is arranged to face the magnetic sensor G. Even if the slinger 12 is not provided with the magnetic encoder 15, the magnetic sensor G can detect the rotational speed, etc. of the bearing device 1 by detecting magnetic changes in the magnetic encoder 17 provided in 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 close to each other, improving detection accuracy. can be achieved.

<Second embodiment>
Next, a sealing device 10A according to a second embodiment shown in FIG. 4 will be described. Note that explanations of the configuration and effects of parts common to the first embodiment will be omitted.
In the sealing device 10A, the configuration of the sealing member 11 is substantially the same as that of the first embodiment, and the configuration of the cover member 16 is different from that of the first embodiment.

In addition to the second disc part 161, the second cylindrical part 162, and the third disc part 163, the cover member 16 includes an external space side extending axially outward from the outer diameter side end 161b of the second disc part 161. A cylindrical portion 164 is provided. The external space side cylindrical portion 164 constitutes a labyrinth R in which the outer circumferential surface 164a is close to the inner circumferential surface 90b of the cylindrical portion 90 of the knuckle 9 with a gap therebetween and extends in the axial direction. By configuring the labyrinth R, foreign matter such as muddy water is prevented from entering the annular groove portion 18 due to the long labyrinth length.

Further, the second cylindrical portion 162 has a different configuration from that of the first embodiment. The second cylindrical portion 162 is formed to extend outward in the axial direction from that of the first embodiment, and is between the second disk portion 161 of the cover member 16 and the first disk portion 121 of the slinger 12. A magnetic sensor G is arranged. In other words, in this embodiment, the magnetic sensor G is inserted into the annular groove 18 .

Further, the second cylindrical portion 162 is provided with a through hole 162c. Although the number of through holes 162c provided in the second cylindrical portion 162 is not particularly limited, it is desirable that a plurality of through holes 162c be provided at intervals along the circumferential direction of the second cylindrical portion 162.

The annular groove portion 18 is formed between the axially outer end surface 4c of the inner ring member 4, the first disk portion 121 of the slinger 12, the outer peripheral surface 162a of the second cylindrical portion 162 of the cover member 16, and the second disk of the cover member 16. This is a concave groove formed of a plurality of members and surrounded by the axially inner surface 161a of the portion 161. Since the second cylindrical portion 162 constituting the bottom surface of the annular groove portion 18 is provided with a through hole 162c, foreign matter such as muddy water that has reached the second cylindrical portion 162 can be removed as shown by the two-dot chain arrow in FIG. It becomes easier to be discharged to the outside through the through hole 162c. The through hole 162c prevents foreign matter such as muddy water from entering the opening side of the annular space S to be sealed.

The sealing device 10A has an annular groove portion 18 with a large groove width so that the magnetic sensor G is disposed between the second disk portion 161 of the cover member 16 and the first disk 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, and foreign matter such as muddy water can be more easily trapped inside the annular groove 18. This makes it easier for the particles to be retained. Thereafter, the foreign matter staying in the annular groove 18 can be easily discharged in conjunction with the discharge effect caused by the rotation of the bearing device 1. Further, since the through hole 162c is provided in the second cylindrical portion 162, which is the bottom surface of the annular groove portion 18, foreign matter staying in the annular groove portion 18 can be removed from the through hole even before being discharged by the rotation of the bearing device 1. 162c and is easily discharged to the outside.

Further, a magnetic encoder 15 is provided on the first disc part 121 of the slinger 12, and a magnetic sensor G is arranged between the second disc part 161 of the cover member 16 and the first disc part 121 of the slinger 12. There is. Therefore, the magnetic encoder 15 and the magnetic sensor G can be arranged close to each other, and detection accuracy can be improved. Furthermore, the cover member 16 can protect the magnetic sensor G and the magnetic encoder 15 from dust and the like from the external space.

<Modified example of second embodiment>
Next, a sealing device 10A' which is a modification of the sealing device 10A shown in FIG. 4 will be described with reference to FIG. 5. Note that explanations of the configuration and effects of parts common to the sealing device 10A in FIG. 4 will be omitted.
The sealing device 10A' in FIG. 5 differs from the sealing device 10A in FIG. 4 in that the slinger 12 of the sealing member 11 does not include the magnetic encoder 15, and the cover member 16 includes the magnetic encoder 17. In the cover member 16, an annular magnetic encoder 17 is provided on the axially inner surface 161a of the second disc portion 161, and is arranged to face the magnetic sensor G. Since the cover member 16 includes the magnetic encoder 17, the rotational speed of the bearing device 1, etc. can be detected by the magnetic sensor G detecting the magnetic change of the magnetic encoder 17.

Further, a magnetic encoder 17 is provided on the second disc portion 161 of the cover member 16, and a magnetic sensor G is disposed between the second disc portion 161 of the cover member 16 and the first disc portion 121 of the slinger 12. ing. Therefore, the magnetic encoder 17 and the magnetic sensor G can be arranged close to each other, and detection accuracy can be improved. Furthermore, the cover member 16 can protect the magnetic sensor G and the magnetic encoder 17 from dust and the like from the external space.

In the bearing device 1, a mounting recess 301 recessed toward the outer diameter side is formed at the end of the inner circumferential surface 30a of the hub body 30 of the hub ring 3 on the vehicle body side. The cover member 16 has a third cylindrical portion 165 that is provided on the inner diameter side of the second cylindrical portion 162 and is fitted and fixed to the inner circumferential surface 301a of the attachment recess 301.

The third cylindrical portion 165 of the cover member 16 extends axially inward from the radially inner end 163a of the third disc portion 163, which is formed by extending radially inward from the axially inner end 162b of the second cylindrical portion 162. formed to extend. The cover member 16 is fixed by fitting the third cylindrical portion 165 provided on the inner diameter side of the second cylindrical portion 162 into the inner circumferential surface 301a of the mounting recess 301, which is a part of the inner circumferential surface of the inner member. The configuration is as follows. Therefore, when the magnetic encoder 17 is disposed 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 is increased. By matching the rotation of the drive shaft 7 with the rotation of the drive shaft 7, the detection accuracy by the magnetic sensor G can be further improved.

Note that each of the sealing devices 10, 10', 10A, and 10A' described above is not limited to the shape and configuration shown in the drawings. For example, the configuration of the seal member 11 is not limited to that described above, and each member constituting the seal member 11, such as the number and shape of the seal lips 141, is not limited to the shapes shown in the figures. Furthermore, the configuration of the cover member 16 is not limited to that illustrated, and for example, a through hole may be provided in the external space side cylindrical portion 164. Further, in each of the above-described embodiments, the outer peripheral surface 162a of the second cylindrical portion 162 of the cover member 16 is provided on the inner diameter side than the outer peripheral surface 4b of the inner ring member 4, but the invention is not limited thereto. 4 may be located at approximately the same position in the radial direction as the outer circumferential surface 4b of the inner ring member 4, or may be provided on the outer radial side of the outer circumferential surface 4b of the inner ring member 4. When the outer circumferential surface 162a of the second cylindrical portion 162 is provided on the outer diameter side than the outer circumferential surface 4b of the inner ring member 4, the third disk portion 163 comes into contact with the first disk portion 121 of the slinger 12. If the magnetic encoder 15 is provided on the first disk portion 121, there is a risk that it will come into contact with the second cylindrical portion 162. Therefore, in that case, it is desirable to provide the magnetic encoder 17 on the second disc part 161 of the cover member 16 without providing the magnetic encoder 15 on the first disc part 121. Further, in each of the embodiments described above, the third disc portion 163 of the cover member 16 is held in contact with the axially outer end surface 4c of the inner ring member 4, but the axially outer end surface 4c of the hub ring 3 The hub wheel 3 and the opposing portion 81 of the axially outer end surface of the hub wheel 3 in the constant velocity joint 8 may be held and fixed by contacting the hub wheel 3 and the constant velocity joint 8 .

1 Bearing device 2 Outer ring (outer member)
3 Hub ring (inner ring)
30 Hub ring body 301 Mounting recess 301a Inner peripheral surface 4 Inner ring member (inner ring)
4b Outer peripheral surface 4c Axial outer end surface 5 Inner ring (inner member)
7 Drive shaft (drive shaft)
8 Constant velocity joint 81 Opposing part 9 Knuckle 10, 10', 10A, 10A' Sealing device 11 Seal member 12 Slinger 120 First cylindrical part 120a Axial outer end 121 First disc part 121a Axial outer surface 13 Core body part 14 Seal lip member 141 Seal lip 15, 17 Magnetic encoder 16 Cover member 161 Second disc part 161a Axial inner surface 161c Inner diameter side end part 161d Axial outer surface 162 Second cylindrical part 162a Outer peripheral surface 162b Axial inner end 162c Through hole 163 Third disk portion 165 Third cylindrical portion 18 Annular groove G Magnetic sensor S Annular space

Claims (9)

In a bearing device including an inner member and an outer member that rotate relatively coaxially, a seal member sealing an opening of an annular space between the inner member and the outer member, and a seal member provided on the outer space side of the seal member. and a cover member that covers the opening,
The sealing member includes a slinger having a first cylindrical portion fitted into the inner member and a first disc portion extending in the outer radial direction from an axially outer end of the first cylindrical portion; It includes a core body part to be fitted, and a seal lip made of an elastic body that is fixed to the core body part and comes into elastic contact with the slinger,
A sealing device characterized in that the cover member and the first disk portion of the slinger constitute an annular groove portion. In claim 1,
The cover member includes a second disc part that faces the first disc part of the slinger and constitutes one side surface of the annular groove part, and a second disc part that extends from the inner diameter side end of the second disc part and includes the annular groove part. a second cylindrical portion forming a bottom surface of the sealing device. In claim 2,
The sealing device is characterized in that an outer circumferential surface of the second cylindrical portion of the cover member is located radially inner than an outer circumferential surface of the inner member. In claim 2 or claim 3,
A sealing device characterized in that the second cylindrical portion of the cover member is provided with a through hole. In any one of claims 1 to 4,
An annular magnetic encoder is provided on the axially outer surface of the first disk portion of the slinger, and is arranged to face the magnetic sensor.
The sealing device is characterized in that the cover member is made of a non-magnetic material and is provided between the magnetic sensor and the magnetic encoder. In any one of claims 1 to 4,
An annular magnetic encoder is provided on the axially outer surface of the first disk portion of the slinger, and is arranged to face the magnetic sensor.
A sealing device characterized in that the magnetic sensor is disposed between the second disk portion of the cover member and the first disk portion of the slinger. In any one of claims 2 to 4,
The sealing device is characterized in that the cover member is provided with an annular magnetic encoder disposed on an axially outer surface or an axially inner surface of the second disc portion, facing the magnetic sensor. . In any one of claims 1 to 7,
The cover member has a third disc part provided on the inner diameter side of the second cylindrical part,
The third disk portion is between the axially outer end surface of the inner member and an opposing portion of the power shaft inserted into the inner diameter side of the inner member that faces the axially outer end surface of the inner member. A sealing device characterized by being clamped and fixed. In any one of claims 1 to 8,
The cover member has a third cylindrical part provided on the inner diameter side of the second cylindrical part,
The sealing device is characterized in that the third cylindrical portion is fitted and fixed to the inner circumferential surface of the inner member.

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