WO2023022043A1

WO2023022043A1 - Vehicle wheel bearing device

Info

Publication number: WO2023022043A1
Application number: PCT/JP2022/030276
Authority: WO
Inventors: 誠関
Original assignee: Ntn株式会社
Priority date: 2021-08-20
Filing date: 2022-08-08
Publication date: 2023-02-23

Abstract

Provided is a vehicle wheel bearing device with which it is possible to achieve good sealing performance without preventing the discharge of muddy water that has penetrated to the inside of a sealing device even if a labyrinth seal has been formed in the sealing device.　An inner seal member 10 of the vehicle wheel bearing device 1 comprises a slinger 14 and a seal member 13 having a metal core 11 and an elastic member 12, and forms a labyrinth seal using a first side lip 122 and a protruding part 14c of the slinger 14. A first gap A in the radial direction between a tip 122a of the first side lip 122 and the protruding part 14c is a size equal to or smaller than a second gap B in the axial direction between the tip 122a of the first side lip 122 and an annular part 14b of the slinger 14, and is bigger than a third gap C in the radial direction between the protruding part 14c and an inner peripheral surface part 121a of the elastic member 12.

Description

Wheel bearing device

The present invention relates to a wheel bearing device.

Conventionally, a wheel bearing device that rotatably supports a wheel in a suspension system of an automobile or the like is known. A wheel bearing device is provided with a sealing device that closes an open end of an annular space formed by an outer member and an inner member to prevent foreign matter such as muddy water from entering.

For example, the sealing device disclosed in Patent Literature 1 includes a core bar including an inner fitting portion fitted to the inner periphery of an outer ring, which is an outer member, and a side plate portion extending radially inward from the inner fitting portion, and a core A seal member having an elastic member integrally joined to gold and having a plurality of seal lips formed thereon, an outer fitting portion fitted to the outer periphery of an inner ring as an inner member, and extending radially outward from the outer fitting portion. A slinger having an annular portion and a projecting portion that projects from the annular portion toward the side plate portion and faces the side plate portion with a gap therebetween. A labyrinth seal is formed by the inner fitting portion of the core bar, the protruding portion of the slinger, and the seal lip located on the outermost diameter side of the elastic member to improve sealing performance and prevent muddy water from entering the sealing device. is suppressed.

Further, the sealing device disclosed in Patent Document 1 includes a metal core including an inner fitting portion fitted to the inner periphery of an outer ring, which is an outer member, and a side plate portion extending radially inward from the inner fitting portion, and a core. A seal member having an elastic member integrally joined to gold and having a plurality of seal lips formed thereon, an outer fitting portion fitted to the outer periphery of an inner ring as an inner member, and extending radially outward from the outer fitting portion. A slinger having an annular portion and an outer diameter portion projecting from the outer diameter side end portion of the annular portion toward the side plate portion and facing the side plate portion with a gap. The inner fitting portion of the core bar and the outer diameter portion of the slinger form a labyrinth structure to improve the sealing performance and prevent muddy water from entering the sealing device.

A magnetic encoder is joined to the slinger as a sealing device on one end in the axial direction, which is the vehicle body side when the wheel bearing device is attached to the vehicle body, and changes in the magnetic flux density of the magnetic encoder can be detected by a rotational speed sensor. Sealing devices with magnetic encoders may be used. In such a sealing device with a magnetic encoder as well, the inner fitting portion of the core metal and the outer diameter portion of the slinger form a labyrinth structure to improve the sealing performance.

Japanese Patent No. 5170366

However, as in the sealing device described in Patent Document 1, in a configuration in which a labyrinth seal is formed using a projecting portion that projects from the annular portion of the slinger toward the side plate portion side, the seal lip located closest to the outer diameter side Depending on the size of the gap in the radial direction between the sealing device and the protruding portion, when muddy water enters the sealing device, it becomes difficult to discharge, and as a result, the improvement of the sealing performance is hindered.

Further, when a labyrinth structure is formed by the inner fitting portion of the cored bar and the outer diameter portion of the slinger as in the aforementioned sealing device, the gap between the inner fitting portion of the cored bar and the outer diameter portion of the slinger can be reduced. Since it is only formed, muddy water may enter the inside of the sealing device through the gap between the inner fitting portion of the cored bar and the outer diameter portion of the slinger.

The present invention has been made in view of the above circumstances, and even when a labyrinth seal is formed in the sealing device, it is possible to obtain good sealing performance without hindering the discharge of muddy water that has entered the sealing device. The object of the present invention is to provide a bearing device for a wheel. In addition, when a labyrinth structure is formed by the inner fitting portion of the core bar and the outer diameter portion of the slinger, the wheel bearing can further improve the sealing performance by suppressing the intrusion of muddy water into the sealing device. It provides an apparatus.

That is, the wheel bearing device includes an outer member having a double-row outer raceway surface on the inner periphery, a hub wheel having a small-diameter stepped portion extending axially on the outer periphery, and a hub wheel press-fitted to the small-diameter stepped portion of the hub wheel. An inner member consisting of at least one inner ring and having a double-row inner raceway surface facing the double-row outer raceway surface, and freely rolling between both raceway surfaces of the outer member and the inner member A wheel bearing device comprising: a double-row rolling element housed therein; The sealing device includes a core bar including an inner fitting portion fitted to the inner circumference of the outer member, and a side plate portion extending radially inwardly from the other axial end of the inner fitting portion, and a seal member having an elastic member that is integrally joined; an outer fitting portion that is fitted to the outer periphery of the inner member; a slinger having an annular portion facing a side plate portion, and a projecting portion projecting from an outer diameter side end portion of the annular portion toward the side plate portion side and facing the sealing member with a gap in the axial direction; The elastic member is bonded to at least the inner peripheral surface of the inner fitting portion and one axial side surface of the side plate portion of the core metal, and is radially opposed to the outer peripheral surface of the protruding portion, and has an inner peripheral surface portion and a shaft. and a plurality of seal lips extending from the base portion joined to the side plate portion toward the slinger. Of the seal lips, the outermost seal lip located on the outermost diameter side is provided in a non-contact state with the slinger, and the outermost seal lip and the projecting portion of the slinger form a labyrinth seal. A first gap in the radial direction between the tip of the seal lip and the projection is smaller than or equal to a second gap in the axial direction between the tip of the outermost seal lip and the annular portion of the slinger. , larger than a third radial gap between the protrusion and the inner peripheral surface of the elastic member.

In addition, the wheel bearing device includes an outer member having a double-row outer raceway surface on the inner periphery, a hub wheel having a small-diameter stepped portion extending axially on the outer periphery, and a hub wheel press-fitted to the small-diameter stepped portion of the hub wheel. An inner member consisting of at least one inner ring and having a double-row inner raceway surface facing the double-row outer raceway surface, and freely rolling between both raceway surfaces of the outer member and the inner member A wheel bearing device comprising: a double-row rolling element housed therein; The sealing device includes a core bar including an inner fitting portion fitted to the inner circumference of the outer member, and a side plate portion extending radially inwardly from the other axial end of the inner fitting portion, and a seal member having an elastic member that is integrally joined; an outer fitting portion that is fitted to the outer periphery of the inner member; a slinger having an annular portion facing a side plate portion, and an outer diameter portion projecting from an outer diameter side end portion of the annular portion toward the side plate portion side and facing the seal member with a gap in the axial direction; a cylindrical portion that is joined to the outer diameter portion of the slinger, the cylindrical portion having a protruding portion that protrudes to the outer diameter side.

According to the present invention, even if muddy water enters the inside of the sealing device in which the labyrinth seal is formed, the muddy water that has entered is not prevented from being discharged, and good sealing performance can be obtained. In addition, the intrusion of muddy water into the sealing device can be suppressed, and the sealing performance can be further improved.

1 is a side sectional view showing a wheel bearing device 1; FIG. 3 is a side cross-sectional view showing an inner side seal member in the wheel bearing device 1. FIG. FIG. 7 is a side cross-sectional view showing a second embodiment of an inner side seal member in the wheel bearing device 1; FIG. 11 is a side cross-sectional view showing a modification of the second embodiment of the inner side seal member in the wheel bearing device 1; FIG. 8 is a side cross-sectional view showing a third embodiment of an inner side seal member in the wheel bearing device 1; FIG. 11 is a side cross-sectional view showing a modification of the third embodiment of the inner side seal member in the wheel bearing device 1; It is a side sectional view showing bearing device 1A for wheels. It is a side cross-sectional view showing an inner side seal member in the wheel bearing device 1A. FIG. 10 is a side cross-sectional view showing a modified example of the projecting portion in the magnetic encoder; FIG. 7 is a side cross-sectional view showing a second embodiment of an inner side seal member in the wheel bearing device 1A. FIG. 11 is a side cross-sectional view showing a third embodiment of an inner side seal member in the wheel bearing device 1A;

The embodiments for carrying out the present invention will be described below with reference to the accompanying drawings.

[First Embodiment of Wheel Bearing Device]
(Wheel bearing device 1)
A wheel bearing device 1 shown in FIG. 1 is a first embodiment of a wheel bearing device according to the present invention, and is for rotatably supporting a wheel in a suspension device of a vehicle such as an automobile.

The wheel bearing device 1 has a configuration called a third generation, and includes an outer ring 2 as an outer member, a hub wheel 3 and an inner ring 4 as inner members, and two rows of inner rings as rolling trains. It comprises a side ball row 5, an outer side ball row 6, an inner side seal member 10, and an outer side seal member 9. - 特許庁

In the following description, the axial direction means the direction along the rotation axis X of the wheel bearing device 1. In addition, the inner side refers to the vehicle body side of the wheel bearing device 1 when it is attached to the vehicle body at one end in the axial direction, and the outer side refers to the other axial end side when it is attached to the vehicle body. The wheel side of the wheel bearing device 1 is shown.

An inner-side opening 2a into which the inner-side seal member 10 can be fitted is formed at the inner-side end of the outer ring 2 . An outer-side opening 2b into which an outer-side sealing member 9 can be fitted is formed in the outer-side end portion of the outer ring 2 .

By fitting the inner seal member 10 into the inner opening 2a, the inner side of the annular space S formed by the outer ring 2, which is the outer member, and the hub wheel 3 and the inner ring 4, which are the inner members. The open end is blocked. The open end of the annular space S on the outer side is closed by fitting the outer side seal member 9 into the outer side opening 2b.

The inner-side sealing member 10 and the outer-side sealing member 9 are sealing devices that close the open end of the annular space S. In this way, the inner side seal member 10 and the outer side seal member 9 close the open ends of the annular space S on the inner side and the outer side, thereby preventing foreign matter such as muddy water from entering the inside of the wheel bearing device 1 . suppressed.

An inner raceway surface 2c on the inner side and an outer raceway surface 2d on the outer side are formed on the inner peripheral surface of the outer ring 2. A vehicle body mounting flange 2e for mounting the outer ring 2 to a vehicle body member is integrally formed on the outer peripheral surface of the outer ring 2 . The vehicle body attachment flange 2 e is provided with bolt holes 2 f into which fastening members (here, bolts) for fastening the vehicle body side member and the outer ring 2 are inserted.

A small-diameter stepped portion 3a having a diameter smaller than that of the outer-side end is formed at the inner-side end of the outer peripheral surface of the hub wheel 3. A wheel mounting flange 3b for mounting a wheel is integrally formed on the outer side end of the hub wheel 3. As shown in FIG. A plurality of bolt holes 3f are formed in the wheel mounting flange 3b. A hub bolt for fastening the hub wheel 3 and a wheel or brake component can be press-fitted into the bolt hole 3f.

In the hub wheel 3, a sliding contact surface 3d is formed on the base side of the wheel mounting flange 3b with which the outer side seal member 9 slides. An outer-side inner raceway surface 3 c is provided on the outer peripheral surface of the hub wheel 3 so as to face the outer-side outer raceway surface 2 d of the outer ring 2 . That is, the inner raceway surface 3c is formed by the hub wheel 3 on the outer side of the inner member.

An inner ring 4 is provided on the small-diameter stepped portion 3a of the hub ring 3. The inner ring 4 is fixed to the small-diameter stepped portion 3a of the hub wheel 3 by press-fitting and caulking. The inner ring 4 applies preload to the inner ball row 5 and the outer ball row 6, which are rolling rows. The inner ring 4 has an inner end face 4b at the inner end. The hub wheel 3 has an inner side end portion formed with a crimped portion 3h which is crimped to the inner side end face 4b of the inner ring 4. As shown in FIG.

An inner raceway surface 4a is provided on the outer peripheral surface 4c of the inner ring 4 so as to face the inner raceway surface 2c of the outer ring 2 . That is, the inner raceway surface 4a is formed by the inner ring 4 on the inner side of the inner member.

The inner ball row 5 and the outer ball row 6, which are rolling rows, are formed by holding a plurality of balls 7, which are rolling elements, by a retainer 8. The inner ball row 5 is rotatably sandwiched between the inner raceway surface 4a of the inner ring 4 and the outer raceway surface 2c of the outer ring 2 on the inner side. The outer-side ball row 6 is rollably sandwiched between the inner raceway surface 3c of the hub wheel 3 and the outer-side raceway surface 2d of the outer ring 2 . That is, the inner ball row 5 and the outer ball row 6 are housed so as to roll freely between the raceway surfaces of the outer member and the inner member.

In the wheel bearing device 1, the outer ring 2, the hub ring 3, the inner ring 4, the inner ball train 5, and the outer ball train 6 constitute a double-row angular contact ball bearing. Note that the wheel bearing device 1 may constitute a double-row tapered roller bearing instead of the double-row angular contact ball bearing.

(outer side seal member)
The outer side seal member 9 has a metal core 91 and an elastic member 92 . The core metal 91 is made of, for example, a steel plate and has a cylindrical shape, and is internally fitted to the outer opening 2b of the outer ring 2 .

The elastic member 92 is made of synthetic rubber, for example, and is joined to the core metal 91 by vulcanization adhesion. The elastic member 92 has a base portion 92a vulcanized and bonded to the core metal 91, and a first side lip 92b, a second side lip 92c, and a grease lip 92d extending from the base portion 92a and formed in an annular shape. are doing.

The first side lip 92b is located on the outermost diameter side of the seal lips of the elastic member 92, and extends from the base portion 92a toward the outer diameter side and the outer side. The second side lip 92c is located on the inner diameter side of the first side lip 92b, and extends from the base portion 92a toward the outer diameter side and the outer side. The grease lip 92b is located on the inner diameter side of the second side lip 92c, and extends from the base portion 92a toward the inner diameter side and the inner side.

The first side lip 92b, the second side lip 92c, and the grease lip 92d of the elastic member 92 are in slidable contact with the lip sliding contact surface 3d of the hub wheel 3.

(Inner side seal member in wheel bearing device 1)
As shown in FIG. 2 , the inner side seal member 10 includes a seal member 13 having a metal core 11 and an elastic member 12 and a slinger 14 . The core metal 11 is made of, for example, a steel plate, and includes a cylindrical inner fitting portion 11a fitted to the inner periphery of the inner side opening 2a of the outer ring 2, and a cylindrical inner fitting portion 11a that extends from the outer side end portion of the inner fitting portion 11a toward the inner diameter side. and an extending annular side plate portion 11b.

The elastic member 12 is made of synthetic rubber, for example, and is integrally joined to the metal core 11 by vulcanization adhesion. The elastic member 12 has a base portion 121 that is vulcanized and bonded to the core metal 11, and a first side lip 122, a second side lip 123, and a grease lip 124 that extend from the base portion 121 and are each formed in an annular shape. are doing. The first side lip 122 , the second side lip 123 and the grease lip 124 are seal lips of the elastic member 12 .

The base portion 121 includes the inner peripheral surface, the inner side end surface, and the inner side portion of the outer peripheral surface of the inner fitting portion 11a, and the inner side surface, the inner diameter side end surface, and the other axial side surface of the side plate portion 11b. It is joined to a portion on the inner diameter side of a certain outer side surface.

The first side lip 122 is located on the outermost diameter side among the seal lips of the elastic member 12 and extends from the base portion 121 toward the outer diameter side and the inner side. The first side lip 122 is an example of an outermost seal lip. The second side lip 123 is located on the inner diameter side of the first side lip 122 and extends from the base portion 121 toward the outer diameter side and the inner side. The grease lip 124 is located on the inner diameter side of the second side lip 123 and extends from the base portion 121 toward the inner diameter side and the outer side.

The slinger 14 is made of, for example, a steel plate, and has a cylindrical outer fitting portion 14a fitted to the outer peripheral surface 4c at the inner end portion of the inner ring 4 and an outer diameter side from the inner end portion of the outer fitting portion 14a. and a projecting portion 14c projecting from the outer diameter side end portion of the annular portion 14b toward the outer side, which is the side plate portion 11b side.

The projecting portion 14c is positioned between the inner fitting portion 11a of the core metal 11 and the first side lip 122 of the elastic member 12 in the radial direction. The annular portion 14b of the slinger 14 is located on the inner side of the side plate portion 11b of the cored bar 11 in the axial direction, and the annular portion 14b and the side plate portion 11b face each other in the axial direction.

The tip 122a of the first side lip 122 faces the projecting portion 14c of the slinger 14 in the radial direction with a first clearance A, and faces the annular portion 14b of the slinger 14 in the axial direction with the second clearance B. . That is, the first side lip 122 is a non-contact lip provided in a non-contact state with the slinger 14 .

The second side lip 123 of the elastic member 12 faces the annular portion 14b of the slinger 14 in the axial direction, and the tip 123a of the second side lip 123 is in slidable contact with the annular portion 14b. . That is, the second side lip 123 is a contact lip.

The grease lip 124 of the elastic member 12 faces the outer fitting portion 14a of the slinger 14 in the radial direction, and the tip of the grease lip 124 is in slidable contact with the outer fitting portion 14a. That is, grease lip 124 is a contact lip.

The first side lip 122 and the second side lip 123 are seal lips extending from the base portion 121 of the elastic member 12 toward the annular portion 14b of the slinger 14 in the axial direction. Also, the grease lip 124 is a seal lip that extends from the base portion 121 of the elastic member 12 toward the outer fitting portion 14a of the slinger 14 in the radial direction.

The base portion 121 of the elastic member 12 has an inner peripheral surface portion 121a facing the outer peripheral surface of the projecting portion 14c in the radial direction, and an outer peripheral side surface portion 121b facing the tip end surface serving as the outer end surface of the projecting portion 14c in the axial direction. are doing. The outer peripheral surface of the projecting portion 14c faces the inner peripheral surface portion 121a with a third gap C therebetween. The tip surface of the projecting portion 14c faces the outer peripheral side surface portion 121b with a fourth gap D therebetween.

In the inner side seal member 10 configured as described above, a labyrinth seal is formed by the inner fitting portion 11 a of the core metal 11 of the seal member 13 , the projecting portion 14 c of the slinger 14 , and the first side lip 122 of the elastic member 12 . Configure.

In the inner side seal member 10, the inner fitting portion 11a, the protruding portion 14c, and the first side lip 122 form a labyrinth seal, thereby suppressing muddy water from entering the inner side seal member 10. to improve sealing performance.

In particular, in the inner side seal member 10, the first side lip 122 is provided in a non-contact state with respect to the slinger 4. Since a labyrinth seal is formed between the inner side seal member 10 and the protruding portion 14c, it is possible to improve the seal performance while suppressing an increase in the seal torque of the inner side seal member 10. As shown in FIG.

In this way, when the labyrinth seal is formed in the inner side seal member 10 and the intrusion of muddy water into the inside is suppressed, the size of the first radial gap A between the first side lip 122 and the projecting portion 14c is Depending on the condition, when muddy water enters the interior of the inner side seal member 10, it may become difficult to be discharged, and as a result, improvement in sealing performance may be hindered.

Therefore, in the inner side seal member 10, the first radial gap A between the first side lip 122 and the protruding portion 14c is set as follows to allow muddy water to enter the inner side seal member 10. Even in the case of this, it is possible to obtain good sealing performance without hindering the discharge of intruded muddy water.

(first gap)
In the inner side seal member 10 , the first gap A in the radial direction between the tip 122 a of the first side lip 122 and the projecting portion 14 c is the distance between the tip 122 a of the first side lip 122 and the annular portion 14 b of the slinger 14 . is formed to have a size equal to or smaller than the second gap B in the axial direction between (A≦B).

Also, the first gap A is formed to be larger than the third gap C in the radial direction between the projecting portion 14c and the inner peripheral surface portion 121a of the elastic member 12 (A>C). Furthermore, the first gap A is formed to have a size greater than or equal to the fourth gap D in the axial direction between the tip surface of the projecting portion 14c and the outer peripheral side surface portion 121b of the elastic member 12 (A≧D). Specifically, the first gap A preferably has a size of 0.5 mm or more.

For example, when muddy water enters between the first side lip 122 and the second side lip 123 inside the inner side seal member 10, centrifugal force due to the rotation of the inner ring 4 in which the slinger 14 is fitted causes the intrusion. Muddy water is discharged through the second clearance B and the first clearance A to the fourth clearance D and the third clearance C side.

In this case, since the second gap B is formed to be greater than or equal to the first gap A, muddy water between the first side lip 122 and the second side lip 123 flows into the first side lip 122 and the projecting portion 14c. It is easy to flow out between

Further, since the first gap A is formed to be larger than the fourth gap D and larger than the third gap C, muddy water flowing out between the first side lip 122 and the projecting portion 14c can pass through the first gap A without being obstructed and be easily discharged to the fourth gap D and the third gap C side. The muddy water discharged to the fourth gap D and the third gap C is discharged to the outside of the inner side seal member 10 by the centrifugal force accompanying the rotation of the inner ring 4 .

Thus, by forming the first gap A to be smaller than the second gap B and larger than the third gap C, the flow of muddy water entering the inner side seal member 10 is prevented. Therefore, the muddy water that has entered can be easily discharged toward the third gap C side. Thus, even when muddy water enters the inside of the inner side seal member 10 formed with the labyrinth seal, discharge of the muddy water that has entered is not hindered, and good sealing performance can be obtained.

Further, by forming the first gap A to a size equal to or larger than the fourth gap D, the muddy water that has entered the inner side seal member 10 is directed toward the fourth gap D without hindering the flow of the muddy water. It can be easily discharged by Accordingly, even when muddy water enters the interior of the inner side seal member 10, discharge of the muddy water that has entered is not hindered, and good sealing performance can be obtained.

(Second Embodiment of Inner Side Seal Member in Wheel Bearing Device 1)
The inner side seal member 10 shown in FIG. 2 can also be configured like the inner side seal member 10A shown in FIG. The inner side seal member 10</b>A differs from the inner side seal member 10 in that an elastic member 22 is provided instead of the elastic member 12 . The inner side seal member 10A includes a seal member 13A having a metal core 11 and an elastic member 22, and a slinger 14. As shown in FIG.

The elastic member 22 has a base portion 221 , a first side lip 222 , a second side lip 223 and a grease lip 224 . The base portion 221 is formed similarly to the base portion 121, and has an inner peripheral surface portion 221a corresponding to the inner peripheral surface portion 121a and an outer peripheral side surface portion 221b corresponding to the outer peripheral side surface portion 121b. The second side lip 223 and the grease lip 224 are formed similarly to the second side lip 123 and the grease lip 124, respectively.

In the inner side seal member 10A, the first gap A1 in the radial direction between the tip 222a of the first side lip 222 and the projecting portion 14c is the distance between the tip 222a of the first side lip 222 and the annular portion 14b of the slinger 14. is formed to have a size equal to or smaller than the second gap B1 in the axial direction between (A1≦B1).

Also, the first gap A1 is formed larger than the third gap C1 in the radial direction between the protruding portion 14c and the inner peripheral surface portion 221a of the elastic member 22 (A1>C1). Further, the first gap A1 is formed to have a size greater than or equal to the fourth gap D1 in the axial direction between the tip surface of the projecting portion 14c and the outer peripheral side surface portion 221b of the elastic member 22 (A1≧D1). Specifically, the first gap A1 preferably has a size of 0.5 mm or more.

The first side lip 222 extends from the base portion 221 of the elastic member 22 toward the annular portion 14b side and the protruding portion 14c side, and has a first angle θ1 of inclination toward the protruding portion 14c side with respect to the axial direction. and a second angle θ2 (θ2 > θ1).

Thus, by forming the first side lip 222 with the first portion 222A having a small inclination angle with respect to the axial direction and the second portion 222B having a large inclination angle with respect to the axial direction, the base portion 221 and the first side lip 222 The volume of the space G formed between and can be formed larger than in the case of forming, for example, the linear first side lip 121 .

By forming the volume of the space G to be large, it becomes possible to store the intruding muddy water in the space G when muddy water enters the inner side seal member 10A. That is, the space G between the base 221 and the first side lip 222 can be used as a gutter for storing water.

As a result, muddy water entering the inner side seal member 10A can be suppressed from flowing toward the second side lip 223 rather than the first side lip 222, and the sealing performance of the inner side seal member 10A can be improved. can be done.

(Modification of Second Embodiment of Inner Side Seal Member in Wheel Bearing Device 1)
The inner side seal member 10A shown in FIG. 3 can also be configured like the inner side seal member 10B shown in FIG. The inner side seal member 10B differs from the inner side seal member 10A in that an elastic member 32 is provided in place of the elastic member 22 . The inner side seal member 10B includes a seal member 13B having a metal core 11 and an elastic member 32, and a slinger .

The elastic member 32 has a base portion 321 , a first side lip 322 , a second side lip 323 and a grease lip 324 . The base portion 321 is formed similarly to the base portion 221, and has an inner peripheral surface portion 321a corresponding to the inner peripheral surface portion 221a and an outer peripheral side surface portion 321b corresponding to the outer peripheral side surface portion 221b. The second side lip 323 and the grease lip 324 are formed similarly to the second side lip 223 and the grease lip 224, respectively.

In the inner side seal member 10B, the first gap A2 in the radial direction between the tip 322a of the first side lip 322 and the projecting portion 14c is the distance between the tip 223a of the first side lip 322 and the annular portion 14b of the slinger 14. is formed to have a size equal to or smaller than the second gap B2 in the axial direction between (A2≦B2).

Also, the first gap A2 is formed larger than the third gap C2 in the radial direction between the protruding portion 14c and the inner peripheral surface portion 321a of the elastic member 32 (A2>C2). Furthermore, the first gap A2 is formed to have a size greater than or equal to the fourth gap D2 in the axial direction between the tip surface of the projecting portion 14c and the outer peripheral side surface portion 321b of the elastic member 32 (A2≧D2). Specifically, the first gap A2 preferably has a size of 0.5 mm or more.

The first side lip 322 extends from the base portion 321 of the elastic member 32 toward the annular portion 14b side and the protruding portion 14c side, and has a first angle θ3 of inclination toward the protruding portion 14c side with respect to the axial direction. and a second angle θ4 (θ4 > θ3).

In the first side lip 222 of the inner side seal member 10A shown in FIG. 3, the boundary portion between the first portion 222A and the second portion 222B is formed in an angular shape. 222B, the change in angle with respect to the axial direction is abrupt.

On the other hand, in the first side lip 322 of the inner side seal member 10B shown in FIG. 4, the boundary portion between the first portion 322A and the second portion 322B is formed in an arc shape. 322B with respect to the axial direction is gradual.

Thus, even when the first side lip 322 is formed by the first portion 322A and the second portion 322B having an arc-shaped boundary, the space formed between the base portion 321 and the first side lip 322 The volume of G1 can be formed larger than, for example, when it is formed like the linear first side lip 121 .

As a result, the muddy water that has entered the interior of the inner side seal member 10B can be stored in the space G1, and the muddy water that has entered the interior is suppressed from flowing toward the second side lip 323 rather than the first side lip 322. As a result, the sealing performance of the inner side sealing member 10B can be improved.

(Third Embodiment of Inner Seal Member in Wheel Bearing Device 1)
The inner side seal member 10A shown in FIG. 3 can also be configured like the inner side seal member 10C shown in FIG. The inner side seal member 10C differs from the inner side seal member 10A in that an elastic member 42 is provided in place of the elastic member 22 . The inner side seal member 10C includes a seal member 13C having a metal core 11 and an elastic member 42, and a slinger 14. As shown in FIG.

The elastic member 42 has a base portion 421 , a first side lip 422 , a second side lip 423 and a grease lip 424 . The base portion 421 is formed similarly to the base portion 221, and has an inner peripheral surface portion 421a corresponding to the inner peripheral surface portion 221a and an outer peripheral side surface portion 421b corresponding to the outer peripheral side surface portion 221b. Grease lip 424 is formed similarly to grease lip 224 .

In the inner side seal member 10C, the first gap A3 in the radial direction between the tip 422a of the first side lip 422 and the projecting portion 14c is the distance between the tip 422a of the first side lip 422 and the annular portion 14b of the slinger 14. is formed to have a size equal to or smaller than the second gap B3 in the axial direction between (A3≦B3).

Also, the first gap A3 is formed to be larger than the third gap C3 in the radial direction between the protruding portion 14c and the inner peripheral surface portion 421a of the elastic member 42 (A3>C3). Further, the first gap A3 is formed to have a size greater than or equal to the fourth gap D3 in the axial direction between the tip surface of the projecting portion 14c and the outer peripheral side surface portion 421b of the elastic member 42 (A3≧D3). Specifically, the first gap A3 preferably has a size of 0.5 mm or more.

The first side lip 422 is formed similarly to the first side lip 222 and has a first portion 422A corresponding to the first portion 222A and a second portion 422B corresponding to the second portion 222B. The inclination angle of the first portion 422A toward the projecting portion 14c with respect to the axial direction is a first angle θ1, and the inclination angle of the second portion 422B toward the projecting portion 14c with respect to the axial direction is a second angle θ2.

A space G having a large volume is formed between the base portion 421 and the first side lip 422, and muddy water that has entered the inner side seal member 10C can be accumulated in the space G.

The second side lip 423 is located on the inner diameter side of the first side lip 422 and extends from the base portion 421 toward the outer diameter side and the inner side. The second side lip 423 faces the annular portion 14b of the slinger 14 in the axial direction, and the tip 423a of the second side lip 423 is in slidable contact with the annular portion 14b. That is, the second side lip 423 is a contact lip, and the tip 423a is a contact portion with respect to the annular portion 14b.

The distal end 423a of the second side lip 423 that contacts the annular portion 14b is located on the inner diameter side of the base end 422b of the first side lip 422. That is, in the radial direction, the distance L1 from the rotation axis X of the wheel bearing device 1 to the tip 423a of the second side lip 423 is It is smaller than the distance L2 to the portion 422b.

When the inner ring 4 rotates, the second side lip 423 of the seal member 13C fitted on the outer ring 2 slides against the annular portion 14b of the slinger 14 fitted on the inner ring 4, so the distance L1 is maintained. By making it smaller than the distance L2, the sliding distance of the second side lip 423 can be reduced. As a result, wear of the second side lip 423 can be suppressed, and good sealing performance can be obtained in the inner side seal member 10C.

(Modified example of the third embodiment of the inner side seal member in the wheel bearing device 1)
The inner side seal member 10C shown in FIG. 5 can also be configured like the inner side seal member 10D shown in FIG. The inner side seal member 10D differs from the inner side seal member 10C in that an elastic member 52 is provided instead of the elastic member 42 . The inner side seal member 10D includes a seal member 13D having a metal core 11 and an elastic member 52, and a slinger 14. As shown in FIG.

The elastic member 52 has a base portion 521 , a first side lip 522 , a second side lip 523 and a grease lip 524 . The base portion 521 is formed similarly to the base portion 421, and has an inner peripheral surface portion 521a corresponding to the inner peripheral surface portion 421a and an outer peripheral side surface portion 521b corresponding to the outer peripheral side surface portion 421b. Grease lip 524 is formed similarly to grease lip 424 .

In the inner side seal member 10D, the first gap A4 in the radial direction between the tip 522a of the first side lip 522 and the projecting portion 14c is the distance between the tip 523a of the first side lip 522 and the annular portion 14b of the slinger 14. is formed to have a size equal to or smaller than the second gap B4 in the axial direction between (A4≦B4).

Also, the first gap A4 is formed to be larger than the third gap C4 in the radial direction between the protruding portion 14c and the inner peripheral surface portion 521a of the elastic member 52 (A4>C4). Furthermore, the first gap A4 is formed to have a size greater than or equal to the fourth gap D4 in the axial direction between the tip surface of the projecting portion 14c and the outer peripheral side surface portion 521b of the elastic member 52 (A4≧D4). Specifically, the first gap A4 preferably has a size of 0.5 mm or more.

The first side lip 522 is formed in the same manner as the first side lip 322 of the inner side seal member 10B shown in FIG. 4, and corresponds to the first portion 522A corresponding to the first portion 322A and the second portion 322B. It has a second part 522B that The inclination angle of the first portion 522A toward the projecting portion 14c with respect to the axial direction is a first angle θ3, and the inclination angle of the second portion 522B toward the projecting portion 14c with respect to the axial direction is a second angle θ4.

A space G1 having a large volume is formed between the base portion 521 and the first side lip 522, and muddy water that has entered the inner side seal member 10D can be accumulated in the space G1.

The second side lip 523 is formed in the same manner as the second side lip 423, is located on the inner diameter side of the first side lip 522, and extends from the base portion 521 toward the outer diameter side and the inner side. The second side lip 523 faces the annular portion 14b of the slinger 14 in the axial direction, and the tip 523a of the second side lip 523 is in slidable contact with the annular portion 14b. That is, the second side lip 523 is a contact lip, and the tip 523a is a contact portion with respect to the annular portion 14b.

The distal end 523a of the second side lip 523 that contacts the annular portion 14b is located on the inner diameter side of the base end 522b of the first side lip 522. That is, similarly to the case of the second side lip 423, the distance from the rotation axis X to the tip 523a of the second side lip 523 in the radial direction is L1, and the distance from the rotation axis X to the base of the first side lip 522 is L1. The distance to portion 522b is L2, and distance L1 is less than distance L2. This makes it possible to suppress wear of the second side lip 523 and obtain good sealing performance in the inner side seal member 10D.

Further, the wheel bearing device 1 in this embodiment is configured as a wheel bearing device 1 of a third-generation structure in which the inner raceway surface 3c is directly formed on the outer periphery of the hub wheel 3, but is limited to this. Instead, it may be a second generation structure in which a pair of inner rings 4 are press-fitted and fixed to the hub wheel 3, or a first generation structure in which a double-row angular contact ball bearing is fitted between the knuckle and the hub wheel. .

[Second Embodiment of Wheel Bearing Device]
(Wheel bearing device 1A)
A wheel bearing device 1A shown in FIG. 7 is a second embodiment of the wheel bearing device according to the present invention, and rotatably supports a wheel in a suspension device of a vehicle such as an automobile.

The wheel bearing device 1A has a configuration called a third generation, and includes an outer ring 102 as an outer member, a hub wheel 103 and an inner ring 104 as inner members, and two rows of inner rings as rolling rows. It comprises a side ball row 5, an outer side ball row 6, an outer side seal member 9, and an inner side seal member 110. - 特許庁

In the following description, the axial direction means the direction along the rotation axis X1 of the wheel bearing device 1A. In addition, the inner side refers to the vehicle body side of the wheel bearing device 1A when it is attached to the vehicle body at one end in the axial direction, and the outer side refers to the other axial end side when it is attached to the vehicle body. The wheel side of the wheel bearing device 1A is shown.

An inner side opening 102a into which the inner side sealing member 110 can be fitted is formed at the inner side end portion of the outer ring 102 . An outer-side opening 102b into which the outer-side seal member 9 can be fitted is formed at the outer-side end of the outer ring 102 .

By fitting the inner seal member 110 into the inner opening 102a, the inner side of the annular space S1 formed by the outer ring 102, which is the outer member, and the hub wheel 103 and the inner ring 104, which are the inner members. The open end is blocked. The outer-side open end of the annular space S1 is closed by fitting the outer-side seal member 9 into the outer-side opening 102b.

The inner-side sealing member 110 and the outer-side sealing member 9 are sealing devices that close the open end of the annular space S1. In this manner, the inner side seal member 110 and the outer side seal member 9 close the opening ends of the annular space S1 on the inner side and the outer side, thereby preventing foreign matter such as muddy water from entering the inside of the wheel bearing device 1A. suppressed.

An inner raceway surface 102c on the inner side and an outer raceway surface 102d on the outer side are formed on the inner peripheral surface of the outer ring 102 . A vehicle body mounting flange 102e for mounting the outer ring 102 to a vehicle body member is integrally formed on the outer peripheral surface of the outer ring 102 . The vehicle body attachment flange 102e is provided with a bolt hole 102f into which a fastening member (here, a bolt) for fastening the vehicle body side member and the outer ring 102 is inserted.

A small-diameter stepped portion 103a having a diameter smaller than that of the outer end portion is formed at the inner end portion of the outer peripheral surface of the hub wheel 103 . A wheel mounting flange 103b for mounting a wheel is integrally formed on the outer side end of the hub wheel 103 . A plurality of bolt holes 103f are formed in the wheel mounting flange 103b. A hub bolt 103e for fastening the hub wheel 103 and a wheel or brake component can be press-fitted into the bolt hole 103f.

In the hub wheel 103, a sliding contact surface 103d is formed on the base side of the wheel mounting flange 103b with which the outer side seal member 9 slides. An outer-side inner raceway surface 103 c is provided on the outer peripheral surface of the hub wheel 103 so as to face the outer-side outer raceway surface 102 d of the outer ring 102 . That is, an inner raceway surface 103c is formed by the hub wheel 103 on the outer side of the inner member.

An inner ring 104 is provided on the small-diameter stepped portion 103a of the hub ring 103. The inner ring 104 is fixed to the small diameter step portion 103a of the hub wheel 103 by press fitting. An inner raceway surface 104 a on the inner side is provided on the outer peripheral surface of the inner ring 104 so as to face the outer raceway surface 102 c on the inner side of the outer ring 102 . That is, the inner raceway surface 104a is formed by the inner ring 104 on the inner side of the inner member.

The inner ball row 5 and the outer ball row 6, which are rolling rows, are formed by holding a plurality of balls 7, which are rolling elements, by a retainer 8. The inner ball row 5 is rollably sandwiched between the inner raceway surface 104 a of the inner ring 104 and the inner side outer raceway surface 102 c of the outer ring 102 . The outer-side ball train 6 is rollably sandwiched between the inner raceway surface 103c of the hub wheel 103 and the outer-side raceway surface 102d of the outer ring 102 . That is, the inner ball row 5 and the outer ball row 6 are housed so as to roll freely between the raceway surfaces of the outer member and the inner member.

In the wheel bearing device 1A, the outer ring 102, the hub wheel 103, the inner ring 104, the inner ball row 5, and the outer ball row 6 constitute a double row angular contact ball bearing. Note that the wheel bearing device 1A may constitute a double-row tapered roller bearing instead of the double-row angular contact ball bearing.

The inner side seal member 110 includes a seal member 113 having a core metal 111 fitted to the outer ring 102 and an elastic member 112 joined to the core metal 111, a slinger 114 fitted to the inner ring 104, and joined to the slinger 114. and a magnetic encoder 15 .

A rotation speed sensor 16 is arranged at a position facing the magnetic encoder 15 in the axial direction. The rotational speed sensor 16 is positioned on the inner side of the magnetic encoder 15 . A cap 17 is fitted to the inner end of the outer ring 102 , and the rotation speed sensor 16 is supported by the cap 17 .

(Inner side seal member in wheel bearing device 1A)
As shown in FIG. 8, the core metal 111 of the inner side seal member 110 is made of, for example, a steel plate, and has a cylindrical inner fitting portion 111a that is fitted to the inner periphery of the inner side opening 102a of the outer ring 102. , and an annular side plate portion 111b extending radially inward from the outer end portion of the inner fitting 111a.

The elastic member 112 is made of synthetic rubber, for example, and is integrally joined to the metal core 111 by vulcanization adhesion. As the elastic member 112, for example, one having a Shore hardness of HS80 or less can be used.

The elastic member 112 has a base portion 1121 that is vulcanized and bonded to the core metal 111, and a first side lip 1122, a second side lip 1123, and a grease lip 1124 that extend from the base portion 1121 and are annularly formed. are doing. The first side lip 1122 , the second side lip 1123 and the grease lip 1124 are sealing lips of the elastic member 112 .

The base portion 1121 includes the inner peripheral surface, the inner side end surface, and the inner side portion of the outer peripheral surface of the inner fitting portion 111a, and the inner side surface, the inner diameter side end surface, and the other axial side surface of the side plate portion 111b. It is joined to a portion on the inner diameter side of a certain outer side surface. The base portion 1121 has an inner peripheral surface portion 1121a that is joined to the inner peripheral surface of the inner fitting portion 111a, and an outer peripheral side surface portion 1121b that is joined to the outer peripheral portion of the inner side surface of the side plate portion 111b.

The first side lip 1122 is located on the outermost diameter side of the seal lips of the elastic member 112 and extends from the base portion 1121 toward the outer diameter side and the inner side. The second side lip 1123 is located on the inner diameter side of the first side lip 1122 and extends from the base portion 1121 toward the outer diameter side and the inner side. The grease lip 1124 is located on the inner diameter side of the second side lip 1123 and extends from the base portion 1121 toward the inner diameter side and the outer side.

The slinger 114 is made of, for example, a steel plate, and has a cylindrical outer fitting portion 114a fitted to the outer peripheral surface 104c at the inner end portion of the inner ring 104, and an outer fitting portion 114a extending from the inner end portion of the outer fitting portion 114a to the outer diameter side. and an outer diameter portion 114c projecting from the outer diameter side end portion of the annular portion 114b toward the outer side, which is the side plate portion 111b side.

The outer diameter portion 114c is located between the inner fitting portion 111a of the core metal 111 and the first side lip 1122 of the elastic member 112 in the radial direction. The annular portion 114b of the slinger 114 is located on the inner side of the side plate portion 111b of the cored bar 111 in the axial direction, and the annular portion 114b and the side plate portion 111b face each other in the axial direction.

The outer peripheral surface of the outer diameter portion 114c faces the inner peripheral surface portion 1121a of the elastic member 112 with a gap in the radial direction. It faces the side surface portion 1121b with a gap therebetween.

The first side lip 1122 of the elastic member 112 faces the annular portion 114b of the slinger 114 in the axial direction, and the tip of the first side lip 1122 is in slidable contact with the annular portion 114b. That is, the first side lip 1122 is a contact lip.

The second side lip 1123 of the elastic member 112 faces the annular portion 114b of the slinger 114 in the axial direction, and the tip of the second side lip 1123 is in slidable contact with the annular portion 114b. That is, the second side lip 1123 is a contact lip.

The grease lip 1124 of the elastic member 112 faces the outer fitting portion 114a of the slinger 114 in the radial direction, and the tip of the grease lip 1124 is in slidable contact with the outer fitting portion 114a. That is, grease lip 1124 is a contact lip.

The first side lip 1122 and the second side lip 1123 are seal lips extending from the base portion 1121 of the elastic member 112 toward the annular portion 114b of the slinger 114 in the axial direction. Also, the grease lip 1124 is a seal lip that extends from the base portion 1121 of the elastic member 112 toward the outer fitting portion 114a side of the slinger 114 in the radial direction.

The magnetic encoder 15 is made of synthetic rubber mixed with magnetic powder such as ferrite, and is integrally joined to the slinger 114 by vulcanization adhesion. The magnetic encoder 15 is vulcanized to the slinger 114 , for example by insert molding with the slinger 114 . As the magnetic encoder 15, one having a Shore hardness in the range of HS80 to HS100, for example, can be used.

The magnetic encoder 15 includes a magnetized portion 151 joined to the inner side surface of the annular portion 114b of the slinger 114, a cylindrical portion 152 joined to the outer peripheral surface of the outer diameter portion 114c of the slinger 114, and an outer diameter portion of the slinger 114. It has an outer side surface portion 153 that is joined to the tip end surface of 114c.

The magnetized portion 151 is alternately magnetized with magnetic poles N and magnetic poles S at equal pitches in the circumferential direction. The magnetized portion 151 of the magnetic encoder 15 and the rotational speed sensor 16 are arranged facing each other with a predetermined air gap (clearance in the axial direction) in the axial direction. By detecting changes in the magnetic flux density of the magnetic encoder 15 with the rotation speed sensor 114, the rotation speed of the inner ring 104 can be detected.

The cylindrical portion 152 is formed in a cylindrical shape and faces the inner peripheral surface portion 1121a of the elastic member 112 with a gap E1 in the radial direction. The outer side surface portion 153 faces the outer peripheral side surface portion 1121b of the elastic member 112 with a gap E2 in the axial direction.

The cylindrical portion 152 has a protruding portion 152a that protrudes radially outward and extends along the circumferential direction. The projecting portion 152a is formed over the entire circumference of the cylindrical portion 152 and has an annular shape. The projecting portion 152a is positioned at the inner side end portion of the cylindrical portion 152 in the axial direction. The protruding portion 152a protrudes toward the outer diameter side and the inner side. That is, the projecting direction of the projecting portion 152a is inclined toward the inner side, which is one end side in the axial direction, with respect to the radial direction.

A gap E3 is provided in the radial direction between the tip of the projecting portion 152a, which is the outer diameter side end, and the inner peripheral surface portion 1121a of the elastic member 112. As shown in FIG. Gap E3 is smaller than gap E1 and gap E2. The gap E3 can be set to a size larger than 0.1 mm and smaller than 0.5 mm, for example (0.1 mm<E2<0.5 mm). Moreover, the protruding portion 152a can be formed to have a thickness t of 0.5 mm or more.

In the inner side seal member 110 configured as described above, the outer diameter portion 114c of the slinger 114 to which the cylindrical portion 152 and the outer side portion 153 of the magnetic encoder 15 are joined, and the inner peripheral surface portion 1121a of the elastic member 112 are joined. A labyrinth structure is formed by the inner fitting portion 111a of the cored bar 111 and the side plate portion 111b of the cored bar 111 to which the outer peripheral side surface portion 1121b of the elastic member 112 is joined.

In the inner side seal member 110, muddy water enters the inner side seal member 110 by forming a labyrinth structure with the outer diameter portion 114c of the slinger 114, the inner fitting portion 111a of the core metal 111, and the side plate portion 111b. This is intended to improve the sealing performance by suppressing this.

In this case, since the cylindrical portion 152 of the magnetic encoder 15 has a protruding portion 152a protruding to the outer diameter side, the inner fitting of the outer diameter portion 114c of the slinger 114 and the core metal 111 from the outside of the inner side seal member 110 is prevented. Muddy water entering between the portion 111a and the portion 111a can be blocked by the projecting portion 152a. As a result, it is possible to suppress the intruding muddy water from flowing into the inner side seal member 110 from the protruding portion 152a, thereby further improving the sealing performance.

In addition, since the protruding portion 152a protrudes in a direction inclined toward the inner side with respect to the radial direction, the outer diameter portion 114c of the slinger 114 and the inner fitting portion 111a of the cored bar 111 enter from the inner side. When muddy water hits the projecting portion 152a, it is suppressed from getting over the projecting portion 152a and entering the inside. As a result, intruding muddy water can be effectively dammed up, and the sealing performance can be improved.

In addition, the magnetic encoder 15 is vulcanized and bonded to the slinger 114 by insert molding together with the slinger 114, but the direction in which the mold is pulled out during the insert molding is set, for example, in the axial direction. In this manner, when the direction in which the mold is pulled out is set in the axial direction, the protruding portion 152a is formed so as to protrude in a direction that is inclined toward the inner side. The projecting direction can be matched, and the magnetic encoder 15 can be molded while suppressing a load from being applied to the projecting portion 152a.

Furthermore, by molding the projecting portion 152a at the same time as molding the magnetic encoder 15, the projecting portion 152a can be formed on the magnetic encoder 15 without increasing the cost.

In addition, since the gap E3 between the tip of the projecting portion 152a and the inner peripheral surface portion 1121a of the elastic member 112 is set to be larger than 0.1 mm and smaller than 0.5 mm, the outer diameter of the slinger 114 is Muddy water entering between the portion 114c and the inner fitting portion 111a of the cored bar 111 is difficult to pass between the tip of the projecting portion 152a and the inner peripheral surface portion 1121a. As a result, it is possible to prevent the intruding muddy water from flowing into the inner side of the projecting portion 152a, and to further improve the sealing performance.

Further, the magnetic encoder 15 in which the projecting portion 152a is formed has a Shore hardness in the range of HS80 to HS100, which is higher than the hardness of the elastic member 112 whose Shore hardness is HS80 or less. Therefore, when the intruding muddy water hits the protruding portion 152a, the protruding portion 152a is unlikely to be deformed, and the muddy water can be effectively blocked. As a result, the sealing performance of the inner side seal member 110 can be improved as compared with the case where the protrusion 152a is formed on the inner peripheral surface portion 1121a of the elastic member 112, for example.

Furthermore, since the protruding portion 152a is formed to have a thickness t of 0.5 mm or more, it has high rigidity, and deformation of the protruding portion 152a when the infiltrating muddy water hits the protruding portion 152a is suppressed. be done. As a result, it is possible to maintain good sealing performance of the inner side sealing member 110 .

(Modified example of protrusion)
In this embodiment, the protruding portion 152a is formed in a shape that is inclined toward the inner side, but it may be formed in a shape that protrudes toward the outer diameter side without being inclined in the axial direction.

The inner side seal member 110A shown in FIG. 9 includes a magnetic encoder 25 having a projecting portion 252a. The inner side seal member 110A is different from the inner side seal member 110 in that it has a magnetic encoder 25 instead of the magnetic encoder 15, and other configurations are the same as those of the inner side seal member 110. FIG.

The magnetic encoder 25 has a magnetized portion 251, a cylindrical portion 252, and an outer side portion 253, and the cylindrical portion 252 is formed with a projecting portion 252a. The protruding portion 252a protrudes radially outward from the outer peripheral surface of the cylindrical portion 252 without being inclined in the axial direction. Other configurations of the projecting portion 252a are the same as those of the projecting portion 152a.

The cylindrical portion 252 of the magnetic encoder 25 differs from the cylindrical portion 152 in that it has a projecting portion 252a instead of the projecting portion 152a. The magnetized portion 251 and the outer side portion 253 of the magnetic encoder 25 are configured similarly to the magnetized portion 151 and the outer side portion 153 of the magnetic encoder 15, respectively.

In this way, even when the cylindrical portion 252 of the magnetic encoder 25 is formed with the protruding portion 252 a that protrudes radially outward without being inclined in the axial direction, the outer diameter portion of the slinger 114 is projected from the outside of the inner side seal member 110 . Muddy water entering between 114c and the inner fitting portion 111a of the cored bar 111 can be blocked by the projecting portion 252a. As a result, it is possible to prevent the intruding muddy water from flowing into the inner side seal member 110 from the projecting portion 252a, thereby improving the sealing performance.

(Second Embodiment of Inner Seal Member in Wheel Bearing Device 1A)
The inner side seal member 110 shown in FIG. 8 can also be configured like the inner side seal member 110B shown in FIG. The inner side seal member 110B is different from the inner side seal member 110 in that it has a magnetic encoder 35 instead of the magnetic encoder 15, and other configurations are the same as those of the inner side seal member 110B.

The magnetic encoder 35 has a magnetized portion 351 , a cylindrical portion 352 and an outer side portion 353 . The magnetized portion 351 and the outer side portion 353 of the magnetic encoder 35 are configured similarly to the magnetized portion 151 and the outer side portion 153 of the magnetic encoder 15, respectively.

The cylindrical portion 352 has a plurality of projecting portions 352a. The plurality of protrusions 352a are arranged side by side in the axial direction. In this embodiment, the cylindrical portion 352 is formed with three projecting portions 352a. Each projecting portion 352a is formed in the same manner as the projecting portion 152a of the magnetic encoder 15, respectively.

When a plurality of protruding portions 352a are formed in the cylindrical portion 352 of the magnetic encoder 35 in the axial direction, muddy water entering between the outer diameter portion 114c of the slinger 114 and the inner fitting portion 111a of the core bar 111 is The protrusion 352a (protrusion 352a-1) positioned on the inner side dams up.

At this time, if there is muddy water that has not been dammed up by the protruding portion 352a-1, the muddy water flows into the inner side of the inner side seal member 110 from the protruding portion 352a-1. However, the muddy water that has flowed to the outer side of the projecting portion 352a-1 is blocked by the projecting portion 352a (the projecting portion 352a-2) located on the outer side of the projecting portion 352a-1.

Furthermore, if there is muddy water that has not been dammed by the projecting portion 352a-2, the muddy water that has flowed into the outer side of the projecting portion 352a-2 will be removed from the projecting portion 352a ( It is blocked by the protrusion 352a-3).

Thus, when a plurality of projecting portions 352 a are formed in the axial direction, the projecting portions 352 a can dam muddy water in a plurality of stages. , can be more effectively suppressed, and the sealing performance of the inner side seal member 110 can be further enhanced.

Even when a plurality of projecting portions 352a are formed on the cylindrical portion 352 of the magnetic encoder 35, the projecting portions 352a are not tilted in the axial direction and the outer diameter is It can have a shape protruding to the side.

(Third Embodiment of Inner Side Seal Member in Wheel Bearing Device 1A)
The inner side seal member 110B shown in FIG. 10 can also be configured like the inner side seal member 110C shown in FIG. The inner side seal member 110C differs from the inner side seal member 110B in that an elastic member 122 is provided instead of the elastic member 112. As shown in FIG. The inner side seal member 110</b>C includes a seal member 123 having a metal core 111 and an elastic member 122 , a slinger 114 and a magnetic encoder 35 .

The elastic member 122 has a base portion 1221 , a first side lip 1222 , a second side lip 1223 and a grease lip 1224 . The base portion 1221 is formed similarly to the base portion 1121, and has an inner peripheral surface portion 1221a corresponding to the inner peripheral surface portion 1121a and an outer peripheral side surface portion 1221b corresponding to the outer peripheral side surface portion 1121b. Second side lip 1223 and grease lip 1224 are formed similarly to second side lip 1123 and grease lip 1124, respectively.

The first side lip 1222 is provided in a non-contact state with respect to the slinger 114. That is, the first side lip 1222 is a non-contact lip provided in a non-contact state with the slinger 114 . A tip 1222a of the first side lip 1222 faces the outer diameter portion 114c of the slinger 114 with a gap in the radial direction, forming a labyrinth seal between the first side lip 1222 and the outer diameter portion 114c.

As described above, in the inner side seal member 110C, the first side lip 1222 is provided in a non-contact state with the slinger 114, and the labyrinthine between the outer diameter portion 114c and the inner fitting portion 111a and the outer peripheral side surface portion 1121b is formed. In addition to the structure, a labyrinth seal is formed between the first side lip 1222 and the outer diameter portion 114c. This makes it possible to improve the sealing performance while suppressing an increase in seal torque in the inner side seal member 110C.

In this embodiment, the inner side seal member 110 is configured to include the magnetic encoder 15 having the magnetized portion 151 and the cylindrical portion 152. A cylindrical portion 152 joined to the portion 114c may be provided, and the cylindrical portion 152 may have a projecting portion 152a projecting radially outward. The same applies to the inner

side seal members

110A, 110B, and 110C.

Further, the wheel bearing device 1A in the present embodiment is configured as the wheel bearing device 1A of the third generation structure in which the inner raceway surface 103c is directly formed on the outer periphery of the hub wheel 103, but is limited to this. Instead, a second-generation structure in which a pair of inner rings 104 are press-fitted and fixed to the hub wheel 103 may be used.

Although the embodiments of the present invention have been described above, the present invention is not limited to such embodiments in any way, and is merely an example. Of course, the scope of the present invention is indicated by the description of the claims, and the meaning of equivalents described in the claims and all changes within the scope include.

The present invention can be used for wheel bearing devices.

1 Wheel Bearing Device 2 Outer Ring 2a Inner Side Opening 2b Outer Side Opening 2c (Inner Side) Outer Raceway Surface 2d (Outer Side) Outer Raceway Surface 3 Hub Wheel 3b Wheel Mounting Flange 3c Inner Raceway Surface 4 Inner Ring 4a Inside Raceway surface 5 Inner side ball row 6 Outer side ball row 10, 10A, 10B, 10C, 10D Inner side seal member 11 Core bar 11a Inner fitting portion 11b Side plate portion 12, 22, 32, 42, 52 Elastic member 13, 13A, 13B, 13C, 13D sealing member 14 slinger 14a outer fitting portion 14b annular portion 14c projecting portion 121, 221, 321, 421, 521 base portion 121a, 221a, 321a, 421a, 521a inner peripheral surface portion 121b, 221b, 321b, 421b, 521b Peripheral Sides 122, 222, 322, 422, 522 First Side Lip 122a, 222a, 322a, 422a, 522a Tip 123, 223, 323, 423, 523 Second Side Lip 123a, 223a, 323a, 423a, 523a Tip 124, 224, 324, 424, 524 Grease lip 222A, 322A, 422A, 522A First part 222B, 322B, 422B, 522B Second part 422b, 522b Base end A, A1, A2, A3, A4 Second 1st clearance B, B1, B2, B3, B4 2nd clearance C, C1, C2, C3, C4 3rd clearance D, D1, D2, D3, D4 4th clearance L1 distance L2 (from the rotation axis to the base end of the first side lip) θ1, θ3 First angles θ2, θ4 Second angles

Claims

an outer member having a double-row outer raceway surface on its inner circumference;
A double-row inner raceway surface facing the double-row outer raceway surface, comprising a hub wheel having a small-diameter stepped portion extending axially on its outer periphery, and at least one inner ring press-fitted into the small-diameter stepped portion of the hub wheel. an inner member having
a double-row rolling element rollably accommodated between the raceway surfaces of the outer member and the inner member;
A wheel bearing device comprising: a sealing device for closing an open end on one axial end side of an annular space formed by the outer member and the inner member,
The sealing device is
a core metal comprising an inner fitting portion fitted to the inner periphery of the outer member and a side plate portion extending radially inward from the other axial end of the inner fitting portion; and integrally joined to the core metal. a sealing member having an elastic member that
an outer fitting portion fitted to the outer periphery of the inner member; an annular portion extending radially outward from one axial end of the outer fitting portion and facing the side plate portion in the axial direction; a slinger having a protruding portion protruding from the outer diameter side end portion of the slinger toward the side plate portion side and facing the sealing member with a gap in the axial direction;
with
The elastic member is joined to at least the inner peripheral surface of the inner fitting portion and one axial side surface of the side plate portion of the core metal, and is radially opposed to the outer peripheral surface of the protruding portion, and the axial direction of the inner peripheral surface portion is a base portion having an outer peripheral side surface facing the tip surface of the protrusion; and a plurality of seal lips extending from the base portion joined to the side plate portion toward the slinger,
Of the plurality of seal lips, the outermost seal lip located on the outermost diameter side is provided in a non-contact state with the slinger, and the outermost seal lip and the projecting portion of the slinger form a labyrinth seal,
A first gap in the radial direction between the tip of the outermost seal lip and the protrusion is equal to or smaller than a second gap in the axial direction between the tip of the outermost seal lip and the annular portion of the slinger. and is larger than a third radial gap between the protrusion and the inner peripheral surface of the elastic member.
The wheel bearing device according to claim 1, wherein the first gap has a size equal to or larger than a fourth gap in the axial direction between the projecting portion and the outer peripheral side surface portion of the elastic member.
The outermost seal lip is
a first portion extending from the base portion joined to the side plate portion toward the annular portion side and the projecting portion side, and having a first angle of inclination toward the projecting portion side with respect to the axial direction;
a second portion extending from the first portion toward the annular portion side and the projecting portion side, and having an inclination angle toward the projecting portion side with respect to the axial direction that is a second angle larger than the first angle; 3. A wheel bearing device according to claim 1 or 2.
The elastic member has the outermost seal lip and a contact lip located on the inner diameter side of the outermost seal lip and in contact with the annular portion of the slinger,
The wheel bearing device according to any one of claims 1 to 3, wherein the contact portion of the contact lip with respect to the annular portion is located on the inner diameter side of the base end portion of the outermost seal lip.
an outer member having a double-row outer raceway surface on its inner circumference;
A double-row inner raceway surface facing the double-row outer raceway surface, comprising a hub wheel having a small-diameter stepped portion extending axially on its outer periphery, and at least one inner ring press-fitted into the small-diameter stepped portion of the hub wheel. an inner member having
a double-row rolling element rollably accommodated between the raceway surfaces of the outer member and the inner member;
A wheel bearing device comprising: a sealing device for closing an open end on one axial end side of an annular space formed by the outer member and the inner member,
The sealing device is
a core metal comprising an inner fitting portion fitted to the inner periphery of the outer member and a side plate portion extending radially inward from the other axial end of the inner fitting portion; and integrally joined to the core metal. a sealing member having an elastic member that
an outer fitting portion fitted to the outer periphery of the inner member; an annular portion extending radially outward from one axial end of the outer fitting portion and facing the side plate portion in the axial direction; a slinger having an outer diameter portion projecting from the outer diameter side end portion of the slinger toward the side plate portion side and facing the seal member with a gap in the axial direction;
a cylindrical portion joined to the outer diameter portion of the slinger;
with
The wheel bearing device, wherein the cylindrical portion has a protruding portion that protrudes radially outward.
The wheel bearing device according to claim 5, wherein the sealing device includes a magnetic encoder having a magnetized portion joined to the annular portion of the slinger and the cylindrical portion.
The wheel bearing device according to claim 5 or claim 6, wherein the projecting direction of the projecting portion is inclined toward the one end side in the axial direction with respect to the radial direction.
The wheel bearing device according to any one of claims 5 to 7, wherein the cylindrical portion is provided with a plurality of projections in the axial direction.
The elastic member has an inner peripheral surface portion that is joined to the inner peripheral surface of the inner fitting portion of the core bar and faces the cylindrical portion,
A gap is provided between the protrusion and the inner peripheral surface in the radial direction,
The wheel bearing device according to any one of claims 5 to 8, wherein the gap is larger than 0.1 mm and smaller than 0.5 mm.