Wheel bearing device

Abstract

To provide a wheel bearing device capable of reducing rotation torque of the wheel bearing device and suppressing intrusion of muddy water to a sealing device.SOLUTION: In a wheel bearing device 1, a contact position 43 with a ball 7 on an inner raceway surface 4a of an inner ring 4 is located on an outer diameter side of a groove part 25a of a track groove 25 of a mouth part 26. The inner ring 4 includes: an inner ring fitted part 4A fitted to a hub ring 3; and a large end part 4B located on the inner side of the inner ring fitted part 4A and having an inner peripheral surface 42 with a diameter larger than that of an inner peripheral surface 41 of the inner ring fitted part 4A. The large end part 4B has an inner side end surface 4b (large end surface) facing the inner side. The inner side seal member 10 includes a core metal 11 comprising a fitted part 111 fitted to an outer ring 2 and a side plate part 112 extending from the fitted part 111 to the inner diameter side; and a seal member 12 integrally joined to the side wall part 112 and a joint side seal lip 122 coming into contact with an outer peripheral surface 26b of the mouth part 26.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a wheel bearing device. [Background technology]

[0002] As disclosed in Patent Document 1, a wheel bearing device that rotatably supports a wheel in a suspension system for a vehicle such as an automobile, such as a passenger car or an SUV, and that includes a constant velocity universal joint that is coupled to a hub wheel, which is an inner member, so as to be able to transmit torque, has been known.

[0003] A driving force from a vehicle's drive source is input to the constant velocity universal joint, and in recent years, there has been a trend toward an increase in electric vehicles from the perspective of preventing global warming and achieving carbon neutrality.

[0004] Therefore, Patent Document 1 discloses a configuration in which the inner raceway surface of the inner ring is positioned on the outer diameter side of the track groove of the mouth portion of the constant velocity universal joint, and the distance between the flange surface of the hub wheel and the center of rotation of the mouth portion relative to the shaft of the constant velocity universal joint is reduced, thereby narrowing the width of the wheel bearing device in the axial direction. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2021 / 148675 Summary of the Invention [Problem to be solved by the invention]

[0006] In the wheel bearing device having the configuration disclosed in Patent Document 1, a pack seal is fitted as a sealing device between the inner end of the inner ring and the inner end of the outer ring, but since the inner raceway surface of the inner ring is located on the outer diameter side of the track groove of the mouth portion and the outer diameter of the inner ring is large, the sliding diameter of the seal lip of the pack seal becomes large, causing an increase in the rotational torque of the wheel bearing device.

[0007] Furthermore, because the sliding diameter of the seal lip in the pack seal is large, in a wheel bearing device mounted on a vehicle, the seal lip in the pack seal is positioned close to the road surface, which makes it easier for the seal lip to become submerged in muddy water when the vehicle enters a puddle, potentially causing muddy water to seep into the inside of the pack seal.

[0008] The present invention has been made in consideration of the above-described circumstances, and provides a wheel bearing device that is configured so that the sliding diameter of the seal lip is small, thereby reducing the rotational torque of the wheel bearing device and preventing muddy water from entering the sealing device. [Means for solving the problem]

[0009] That is, the wheel bearing device comprises an outer member having double-row outer raceway surfaces on its inner periphery, a hub ring having a through-hole penetrating in the axial direction in its inner diameter portion and having an inner raceway surface formed on one axial side opposite the outer raceway surface on one axial side, and an inner ring fitted to the hub ring and having an inner raceway surface formed on the other axial side opposite the outer raceway surface on the other axial side, double-row rolling elements accommodated so as to roll freely between both raceway surfaces of the outer member and the inner member, a mouth portion having track grooves formed on its inner periphery surface, and a fitting portion extending axially from the mouth portion and capable of fitting into the through-hole of the hub ring, and and a sealing device that closes the open end, wherein the contact position between the rolling element and the inner raceway surface on the other axial side of the inner member is located on the outer diameter side of the groove bottom of the track groove in the mouth portion, the inner ring has an inner ring fitting portion that is fitted onto the hub wheel, and a big end that is located on the other axial side of the inner ring fitting portion and has a larger diameter than the inner ring fitting portion, the big end has a large end face facing the other axial side, and the sealing device comprises: a core bar consisting of a fitting portion that is fitted onto the outer member and a side plate portion that extends from the fitting portion towards the inner diameter side, and a seal member that is integrally joined to the side plate portion of the core bar and has a joint-side seal lip that contacts the outer peripheral surface of the mouth portion. [Effects of the Invention]

[0010] According to the present invention, it is possible to reduce the rotational torque of the wheel bearing device and also to suppress the intrusion of muddy water into the sealing device. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a side cross-sectional view showing a wheel bearing device. [Figure 2] FIG. 4 is a side cross-sectional view showing an inner seal member. [Figure 3] FIG. 10 is a side cross-sectional view showing an inner seal member according to a second embodiment. [Figure 4] FIG. 11 is a side cross-sectional view showing an inner seal member according to a third embodiment. [Figure 5] FIG. 10 is a side cross-sectional view showing an inner seal member according to a fourth embodiment. [Figure 6] FIG. 11 is a side cross-sectional view showing an inner seal member according to a fifth embodiment. [Figure 7] FIG. 13 is a side cross-sectional view showing an inner seal member according to a sixth embodiment. [Figure 8] FIG. 13 is a side cross-sectional view showing an inner seal member according to the seventh embodiment. [Figure 9] FIG. 13 is a side cross-sectional view showing an inner seal member according to an eighth embodiment. [Figure 10] FIG. 13 is a side cross-sectional view showing an inner seal member according to a ninth embodiment. [Figure 11] FIG. 22 is a side cross-sectional view showing an inner seal member according to a tenth embodiment. [Figure 12] FIG. 22 is a cross-sectional side view showing an inner seal member according to an eleventh embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0013] [Wheel bearing device] A wheel bearing device 1 shown in FIG. 1 is one embodiment of a wheel bearing device according to the present invention, and supports a wheel rotatably in a suspension system of a vehicle such as an automobile.

[0014] In the following description, the axial direction refers to the direction along the rotation axis X of the wheel bearing device 1. The outer side refers to one side in the axial direction, which is the wheel side of the wheel bearing device 1 when attached to the vehicle body, and the inner side refers to the other side in the axial direction, which is the vehicle body side of the wheel bearing device 1 when attached to the vehicle body.

[0015] The wheel bearing device 1 includes an outer ring 2 as an outer member, a hub ring 3 and an inner ring 4 as inner members, two rolling rows of inner ball rows 5 and outer ball rows 6, an outer seal member 9, an inner seal member 10, and a constant velocity universal joint 20.

[0016] An inner side opening 2a is formed at the inner side end of the outer ring 2, into which an inner side seal member 10 can be fitted. An outer side opening 2b is formed at the outer side end of the outer ring 2, into which an outer side seal member 9 can be fitted.

[0017] The inner seal member 10 is fitted into the inner opening 2a, thereby closing the inner opening end of the annular space S formed by the outer ring 2 and the inner member. The outer seal member 9 is fitted into the outer opening 2b, thereby closing the outer opening end of the annular space S.

[0018] An inner-side outer raceway surface 2c and an outer-side outer raceway surface 2d 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 (knuckle) is integrally formed on the outer peripheral surface of the outer ring 2.

[0019] A small diameter step 3a that extends in the axial direction and has a smaller diameter than the outer end is formed at the inner end of the outer peripheral surface of the hub wheel 3. A shoulder 3i is formed at the outer end of the small diameter step 3a of the hub wheel 3.

[0020] A wheel mounting flange 3b for mounting a wheel is formed integrally with the outer end of the hub wheel 3. The wheel mounting flange 3b is provided with bolt holes 3f into which hub bolts are press-fitted or wheel bolts are screwed. The wheel mounting flange 3b has a flange surface 3j against which a brake rotor assembled to the wheel mounting flange 3b abuts.

[0021] The hub ring 3 is formed with an outer-side inner raceway surface 3c that faces the outer-side outer raceway surface 2d of the outer ring 2. The hub ring 3 also has a lip sliding surface 3d formed on the base side of the wheel mounting flange 3b, with which the outer-side seal member 9 slides.

[0022] A through hole 3e is formed in the inner diameter portion of the hub wheel 3 along the axial direction, and is connected to the constant velocity universal joint 20. The through hole 3e passes through the hub wheel 3 in the axial direction. An inner ring 4 is fitted into the small diameter step portion 3a of the hub wheel 3.

[0023] An inner raceway surface 4a is formed on the outer peripheral surface of the inner ring 4. In other words, the inner-side inner raceway surface 4a is formed by the inner ring 4 on the inner side of the hub ring 3. The inner raceway surface 4a faces the inner-side outer raceway surface 2c of the outer ring 2.

[0024] The inner ring 4 has an inner end face 4b at its inner end and an outer end face 4c at its outer end. The outer end face 4c, located at the outer end of the inner ring 4, abuts against a shoulder 3i of the hub wheel 3 from the inner side. The inner ring 4 is formed in a tapered shape that increases in diameter from the outer side to the inner side, and the inner end face 4b is located radially outer than the outer end face 4c.

[0025] The inner ball row 5 and outer ball row 6, which are rolling rows, are formed by a plurality of balls 7, which are rolling elements, being held in a cage 8. The inner ball row 5 is rollably sandwiched between the inner raceway surface 4a of the inner ring 4 and the inner-side outer raceway surface 2c of the outer ring 2. The outer ball row 6 is rollably sandwiched between the inner raceway surface 3c of the hub ring 3 and the outer-side outer raceway surface 2d of the outer ring 2. The inner ring 4 applies a preload to the inner ball row 5 and outer ball row 6, which are rolling rows.

[0026] In the wheel bearing device 1, a double-row angular contact ball bearing is formed by the outer ring 2, hub ring 3, inner ring 4, inner ball row 5, and outer ball row 6. The wheel bearing device 1 may also be formed by a double-row tapered roller bearing.

[0027] The constant velocity universal joint 20 includes an outer joint member 21 having track grooves 25 formed on its inner circumferential surface, an inner joint member 22 having track grooves 22 a formed on its outer circumferential surface opposite the track grooves 25, balls 23 incorporated between the track grooves 25 and 22 a, and a cage 24 interposed between the inner circumferential surface of the outer joint member 21 and the outer circumferential surface of the inner joint member 22 to hold the balls 23.

[0028] The outer joint member 21 has a mouth portion 26 that houses internal components including the inner joint member 22, balls 23, and a cage 24, and a stem portion 27 that extends integrally from the mouth portion 26 toward the outer side in the axial direction. The track grooves 25 are formed on the inner peripheral surface of the mouth portion 26.

[0029] The stem portion 27 is spline-fitted into the through hole 3e of the hub wheel 3, allowing the hub wheel 3 and the constant velocity universal joint 20 to rotate together. The stem portion 27 is an example of a fitting portion that can be fitted into the through hole of the hub wheel.

[0030] An end of a shaft 31, to which driving force is input from a driving source such as an engine or a motor, is press-fitted into the inner joint member 22. The inner joint member 22 and the shaft 31 are connected by spline fitting so as to be able to transmit torque.

[0031] The mouth portion 26 of the outer joint member 21 supports the shaft 31 rotatably about the rotation axis X via the inner joint member 22, the ball 23, and the cage 24. The shaft 31 is rotatable about a rotation center P in the mouth portion 26.

[0032] An external threaded portion 27a is formed at the outer end of the stem portion 27, and by screwing a nut 30 onto the external threaded portion 27a, the hub wheel 3 and the constant velocity universal joint 20 are fastened together with the stem portion 27 fitted into the through hole 3e.

[0033] In the wheel bearing device 1, when fitting the stem portion 27 of the constant velocity universal joint 20 to the hub wheel 3, the stem portion 27 is inserted into the through hole 3e of the hub wheel 3 from the inner side, and then a nut 30 is screwed onto the male threaded portion 27a and the stem portion 27 is pulled to the outer side of the through hole 3e, thereby completing the fitting between the stem portion 27 and the hub wheel 3.

[0034] [Inner ring and mouth part] The inner ring 4 has an inner ring fitting portion 4A, a big end 4B, and a tapered portion 4C. The inner ring fitting portion 4A is the portion that fits into the small diameter step portion 3a of the hub wheel 3, and has an inner circumferential surface 41 that serves as a fitting surface for the small diameter step portion 3a. The inner circumferential surface 41 is an example of a first inner circumferential surface. An outer side end face 4c of the inner ring 4 is located at the outer side end of the inner ring fitting portion 4A.

[0035] The inner ring 4 is located at the inner end of the inner ring fitting portion 4A, and has an inner ring contact surface 4d that contacts the mouth portion 26 of the constant velocity universal joint 20. The inner ring contact surface 4d is formed as an inclined surface that is inclined relative to the direction perpendicular to the axial direction.

[0036] The big end 4B is located axially more inward than the inner ring fitting portion 4A, and has an inner peripheral surface 42 with a larger diameter than the inner peripheral surface 41 of the inner ring fitting portion 4A. The inner peripheral surface 42 is an example of a second inner peripheral surface.

[0037] The inner end face 4b of the inner ring 4 is located at the inner end of the big end 4B and faces the inner side. The inner end face 4b is an example of a big end face. The inner ring abutment surface 4d is located radially inward of the inner circumferential surface 42 of the big end 4B and is located axially outward of the big end 4B. The outer circumferential surface 4e of the big end 4B of the inner ring 4 is located radially outward of the outer circumferential surface 26b of the mouth portion 26.

[0038] The tapered portion 4C is a portion that connects the inner ring fitting portion 4A and the big end 4B, and is formed in a tapered shape that increases in diameter from the outer side toward the inner side.

[0039] The mouth portion 26 of the outer joint member 21 has a joint-side abutment surface 26a. The joint-side abutment surface 26a is formed as an inclined surface that is inclined with respect to a direction perpendicular to the axial direction, and is located at the outer end portion of the mouth portion 26. The joint-side abutment surface 26a faces the inner-ring-side abutment surface 4d of the inner ring 4 in the axial direction, and the joint-side abutment surface 26a and the inner-ring-side abutment surface 4d are in abutment with each other.

[0040] With the nut 30 threaded onto the male thread portion 27a and the stem portion 27 fitted into the through hole 3e, the joint-side abutment surface 26a of the mouth portion 26 abuts against the inner-ring-side abutment surface 4d of the inner ring 4, and the inner ring 4 is pressed axially outward by the mouth portion 26. Pressing the inner ring 4 outward applies a preload to the inner ball row 5 and the outer ball row 6 inside the wheel bearing device 1.

[0041] [Inner ball row and outer ball row] The balls 7 in the inner ball row 5 are in contact with the inner raceway surface 4a of the inner ring 4 at contact positions 43. The contact positions 43 are located axially more inward than the centers C of the balls 7 in the inner ball row 5, and the line connecting the centers C of the balls 7 in the inner ball row 5 and the contact positions 43 is inclined relative to a direction perpendicular to the axial direction.

[0042] A ball 7 in the outer ball row 6 contacts the inner raceway surface 3c of the hub wheel 3 at a contact position 3m. The contact position 3m is located axially more outer than the center C of a ball 7 in the outer ball row 6, and the line connecting the center C of a ball 7 in the outer ball row 6 and the contact position 3m is inclined relative to a direction perpendicular to the axial direction.

[0043] A contact position 43 on the inner raceway surface 4a of the inner ring 4 is located a length D1 toward the outer diameter side from the groove bottom 25a of the track groove 25 formed in the mouth portion 26. This allows the rotation center P of the mouth portion 26 and the flange surface 3j of the wheel mounting flange 3b of the hub wheel 3 to be positioned closer to each other in the axial direction, making it possible to narrow the width of the wheel bearing device 1.

[0044] Furthermore, contact position 3m with balls 7 of outer ball row 6 on inner raceway surface 3c of hub ring 3 is located on the inner diameter side of contact position 43 with balls 7 of inner ball row 5 on inner raceway surface 4a of inner ring 4. Contact position 43 with balls 7 of inner ball row 5 has a larger diameter than contact position 3m with balls 7 of outer ball row 6, and since balls 7 of inner ball row 5 have a relatively long life and shoulder riding performance, the contact angle of inner ball row 5 may be made larger than the contact angle of balls 7 of outer ball row 6 to improve bearing rigidity performance.

[0045] By positioning the contact position 3m on the inner raceway surface 3c of the hub ring 3 on the inner diameter side of the contact position 43 on the inner raceway surface 4a of the inner ring 4, the outer ball row 6 and the inner ball row 5 can be positioned closer to each other in the axial direction, making it possible to narrow the wheel bearing device 1 in the axial direction.

[0046] [Inner seal material] As shown in FIG. 2, the inner seal member 10 includes a core metal 11 that fits into the inner opening 2a at the inner end of the outer ring 2, and a seal member 12 that is integrally joined to the core metal 11.

[0047] The core metal 11 has a cylindrical fitting portion 111 that is fitted onto the outer peripheral surface of the inner side opening 2a of the outer ring 2, and a side plate portion 112 that extends from the fitting portion 111 toward the inner diameter side and is formed into a disk shape.

[0048] The sealing member 12 has a base 121 integrally joined to the inner diameter side end of the side plate portion 112 of the core metal 11, and a first joint side seal lip 122 and a second joint side seal lip 123 that contact the outer peripheral surface 26b of the mouth portion 26 of the outer joint member 21.

[0049] The first joint side seal lip 122 and the second joint side seal lip 123 are examples of joint side seal lips. The first joint side seal lip 122 and the second joint side seal lip 123 are contact lips that come into contact with the outer peripheral surface 26b of the mouth portion 26.

[0050] The first joint side seal lip 122 extends from the base 121 toward the inner diameter side and the inner periphery side. The second joint side seal lip 123 extends from the base 121 toward the outer diameter side and the inner periphery side. The first joint side seal lip 122 is in contact with the outer peripheral surface 26b of the mouth portion 26 on the outer diameter side and inner side of the second joint side seal lip 123. The first joint side seal lip 122 may be disposed so as to be on the inner diameter side of the second joint side seal lip 123.

[0051] The fitting portion 111 of the core wire 11 is fitted onto the outer peripheral surface of the inner side opening 2a of the outer ring 2, and the first joint side seal lip 122 and the second joint side seal lip 123 of the sealing member 12 contact the outer peripheral surface 26b of the mouth portion 26, thereby blocking the inner side opening end of the annular space S formed by the outer ring 2 and the inner ring 4.

[0052] In this way, by closing the open end of the annular space S with the inner seal member 10, it is possible to prevent foreign matter such as muddy water from entering the annular space S.

[0053] In this case, by coating the surface of the core 11 with a resin material such as epoxy resin or acrylic resin, it is possible to improve the sealing performance between the core 11 and the outer ring 2 and between the core 11 and the seal member 12, thereby increasing the muddy water resistance of the inner seal member 10. It is also possible to improve the rust resistance of the core 11. The resin film can be formed on the surface of the core 11 by electrodeposition coating, for example.

[0054] Furthermore, the contact position of the first joint-side seal lip 122 with the outer peripheral surface 26b of the mouth portion 26 is located a length D2 toward the inner diameter side of the outer peripheral surface 4e of the big end 4B of the inner ring 4, and therefore the sliding diameters of the first joint-side seal lip 122 and the second joint-side seal lip 123 can be made smaller than the sliding diameter of the seal lips when a sealing device such as a pack seal is fitted between the outer peripheral surface 4e of the inner ring 4 and the inner peripheral surface of the inner-side opening 2a of the outer ring 2. This makes it possible to reduce the rotational torque of the wheel bearing device.

[0055] Furthermore, by reducing the sliding diameters of the first joint side seal lip 122 and the second joint side seal lip 123, the first joint side seal lip 122 and the second joint side seal lip 123 in the wheel bearing device 1 mounted on a vehicle are positioned away from the road surface. As a result, even when the vehicle enters a puddle, the first joint side seal lip 122 and the second joint side seal lip 123 are less likely to be submerged in muddy water, making it possible to prevent muddy water from entering the inside of the inner side seal member 10.

[0056] Furthermore, by bringing the first joint-side seal lip 122 and the second joint-side seal lip 123 into contact with the outer peripheral surface 26b of the mouth portion 26, it is no longer necessary to fit the inner-side seal member 10 between the outer ring 2 and the inner ring 4, and it is possible to reduce the axial length of the big end 4B of the inner ring 4. This allows the wheel bearing device 1 to be made lighter.

[0057] Furthermore, in the inner ring 4, only the inner ring fitting portion 4A fits into the small diameter step portion 3a of the hub ring 3, and the big end 4B does not fit into the hub ring 3. Therefore, even if the axial length of the big end 4B is reduced, the tension force of the inner ring 4 against the hub ring 3 does not decrease, and the creep resistance of the inner ring 4 can be maintained.

[0058] Furthermore, because the inner seal member 10, which is composed of the core metal 11 and the seal member 12, seals between the outer ring 2 and the mouth portion 26 of the constant velocity universal joint 20, there is no need for an O-ring to seal between the inner ring 4 and the mouth portion 26. Furthermore, there is no need to provide a slinger with which the seal lip slides, as in the case of a pack seal fitted between the outer ring 2 and the inner ring 4. This makes it possible to reduce the number of parts that make up the wheel support bearing device 1, and to reduce the cost of the wheel support bearing device 1.

[0059] Furthermore, in the inner side seal member 10, by forming the core metal 11 from a non-magnetic material such as SUS, a magnetic encoder can be fitted to the outer peripheral surface 4e of the inner ring 4, and a rotational speed sensor can be placed in a position opposite the magnetic encoder across the core metal 11, and the rotational speed sensor can read changes in the magnetic flux density of the magnetic encoder to detect the rotational speed of the inner ring 4.

[0060] The seal member 12 in the inner side seal member 10 has two seal lips, a first joint side seal lip 122 and a second joint side seal lip 123, which contact the outer peripheral surface 26b of the mouth portion 26, but the number of seal lips contacting the outer peripheral surface 26b of the mouth portion 26 may be one, or three or more.

[0061] [Second embodiment of inner seal member] The inner seal member 10 can also be configured as an inner seal member 10A shown in Fig. 3. The inner seal member 10A differs from the inner seal member 10 in that it has a core metal 11A instead of the core metal 11.

[0062] The core metal 11A is fitted into the inner-side opening 2a at the inner-side end of the outer ring 2. The core metal 11A is fitted into the inner circumferential surface of the inner-side opening 2a of the outer ring 2 and has a cylindrical fitting portion 111A, and extends radially inward from the fitting portion 111A and is formed into a disk-like side plate portion 112A. A seal member 12 is integrally joined to the radially inward end of the side plate portion 112A.

[0063] An elastic member 13 is joined to an inner end portion on the outer peripheral surface of the fitting portion 111A and an outer diameter end portion on the inner side surface of the side plate portion 112A. By providing the elastic member 13 at the outer diameter end portion of the core bar 11A in this way, when the core bar 11A is fitted onto the inner peripheral surface of the inner side opening 2a, the elastic member 13 is interposed between the outer ring 2 and the core bar 11A, making it possible to prevent foreign matter such as muddy water from entering the annular space S from between the outer ring 2 and the core bar 11A.

[0064] [Third embodiment of inner seal member] The inner seal member 10 can also be configured as an inner seal member 10B shown in Fig. 4. The inner seal member 10B differs from the inner seal member 10 in that it has a seal member 12B instead of the seal member 12.

[0065] The sealing member 12B has a base 121B integrally joined to the inner diameter side end of the side plate portion 112 of the core metal 11, a joint side seal lip 122B that contacts the outer peripheral surface 26b of the mouth portion 26 of the outer joint member 21, and an inner ring side seal lip 123B that contacts the inner side end face 4b of the inner ring 4.

[0066] The joint-side seal lip 122B is a contact lip that comes into contact with the outer peripheral surface 26b of the mouth portion 26, and the inner-ring-side seal lip 123B is a contact lip that comes into contact with the inner-side end surface 4b of the inner ring 4.

[0067] The joint-side seal lip 122B extends from the base 121B toward the inner diameter side and the inner side. The inner ring-side seal lip 123B extends from the base 121B toward the outer diameter side and the inner side. The joint-side seal lip 122B contacts the outer peripheral surface 26b of the mouth portion 26 on the inner side of the inner ring-side seal lip 123B.

[0068] In the inner side seal member 10B, the joint side seal lip 122B contacts the outer peripheral surface 26b of the mouth portion 26, and the inner ring side seal lip 123B contacts the inner side end face 4b of the inner ring 4, thereby blocking the inner side opening end of the annular space S.

[0069] In this way, the inner side seal member 10B has not only the joint side seal lip 122B that contacts the outer peripheral surface 26b of the mouth portion 26, but also the inner ring side seal lip 123B that contacts the inner side end face 4b of the inner ring 4, thereby making it possible to further prevent foreign matter such as muddy water from entering the annular space S.

[0070] In addition, in the inner side seal member 10B, instead of the core bar 11 in which the fitting portion 111 is fitted to the outer peripheral surface of the inner side opening 2a in the outer ring 2, a configuration using a core bar 11A in which the fitting portion 111A is fitted to the inner peripheral surface of the inner side opening 2a in the outer ring 2 can also be used.

[0071] [Fourth embodiment of inner seal member] The inner seal member 10 can also be configured as an inner seal member 10C shown in Fig. 5. The inner seal member 10C differs from the inner seal member 10 in that it has a seal member 12C instead of the seal member 12. The inner end face 4b of the inner ring 4 shown in Fig. 5 has a first protrusion 4f that protrudes toward the inner side on the inner diameter side.

[0072] The sealing member 12C has a base 121C integrally joined to the inner diameter side end of the side plate portion 112 of the core wire 11, a joint side seal lip 122C that contacts the outer peripheral surface 26b of the mouth portion 26 of the outer joint member 21, and an inner ring side seal lip 123C that contacts the inner side end face 4b on the outer diameter side of the first protruding portion 4f of the inner ring 4.

[0073] A base 121C of the seal member 12C joined to the outer side surface at the inner diameter side end of the side plate portion 112 and the first protrusion 4f of the inner ring 4 face each other with a gap in the axial direction. The joint-side seal lip 122C is a contact lip that contacts the outer peripheral surface 26b of the mouth portion 26, and the inner ring-side seal lip 123C is a contact lip that contacts the inner side end face 4b of the inner ring 4.

[0074] The joint side seal lip 122C extends from the base 121C toward the inner side and the inner diameter side. The inner ring side seal lip 123C extends from the base 121C toward the outer side and the inner diameter side. The joint side seal lip 122C contacts the outer peripheral surface 26b of the mouth portion 26 on the inner side of the inner ring side seal lip 123C. The joint side seal lip 122C is located on the inner diameter side of the inner ring side seal lip 123C.

[0075] In the inner side seal member 10C, the joint side seal lip 122C contacts the outer peripheral surface 26b of the mouth portion 26, and the inner ring side seal lip 123C contacts the inner side end face 4b of the inner ring 4, thereby blocking the inner side opening end of the annular space S.

[0076] In addition, in the inner side seal member 10C, a first labyrinth seal LS1 is formed by the base 121C of the seal member 12C joined to the outer side surface at the inner diameter side end of the side plate portion 112 and the first protrusion 4f of the inner ring 4.

[0077] In this way, by forming the first labyrinth seal LS1 between the base 121C of the sealing member 12C and the first protrusion 4f of the inner ring 4, the first labyrinth seal LS1 can prevent foreign matter such as muddy water from entering the annular space S through the gap between the inner ring 4 and the sealing member 12C, thereby improving the muddy water resistance of the inner side sealing member 10C.

[0078] In addition, in the inner side seal member 10C, instead of the core bar 11 in which the fitting portion 111 is fitted to the outer peripheral surface of the inner side opening 2a in the outer ring 2, a configuration using a core bar 11A in which the fitting portion 111A is fitted to the inner peripheral surface of the inner side opening 2a in the outer ring 2 can also be used.

[0079] [Fifth embodiment of inner seal member] The inner seal member 10 can also be configured as an inner seal member 10D shown in Figure 6. The inner seal member 10D differs from the inner seal member 10 in that it has a seal member 12D instead of the seal member 12. The mouth portion 26 shown in Figure 6 has a second protrusion 261 that protrudes radially outward from the outer circumferential surface 26b on the inner side of the inner seal member 10D. The second protrusion 261 has an outer side surface 261a that faces the outer side.

[0080] The sealing member 12D has a base 121D integrally joined to the inner diameter side end of the side plate portion 112 of the core wire 11, a joint side seal lip 122D that contacts the outer peripheral surface 26b of the mouth portion 26 of the outer joint member 21, and an inner ring side seal lip 123D that contacts the inner side end face 4b of the inner ring 4.

[0081] The joint-side seal lip 122D is a contact lip that comes into contact with the outer peripheral surface 26b of the mouth portion 26, and the inner-ring-side seal lip 123D is a contact lip that comes into contact with the inner-side end face 4b of the inner ring 4.

[0082] The joint-side seal lip 122D extends from the base 121D toward the inner and outer diameter sides. The inner ring-side seal lip 123D extends from the base 121D toward the outer and inner diameter sides. The joint-side seal lip 122D contacts the outer peripheral surface 26b of the mouth portion 26 on the inner side of the inner ring-side seal lip 123D.

[0083] Specifically, the joint-side seal lip 122D is in contact with an outer side surface 261a of a second protrusion 261 formed on the outer peripheral surface 26b of the mouth portion 26. The second protrusion 261 protrudes radially outward beyond the joint-side seal lip 122D. The second protrusion 261 is also located more inward than the joint-side seal lip 122D.

[0084] In this way, in the inner side seal member 10D, the second protruding portion 261, which protrudes further outward than the joint side seal lip 122D, is located on the inner side of the joint side seal lip 122D, so that foreign matter such as muddy water from outside will hit the second protruding portion 261 before hitting the joint side seal lip 122D.

[0085] As a result, foreign matter such as muddy water from outside hits the second protrusion 261, weakens its momentum, and then comes into contact with the joint side seal lip 122D, thereby preventing foreign matter such as muddy water from entering the interior of the inner side seal member 10D.

[0086] In addition, in the inner side seal member 10D, instead of the core bar 11 in which the fitting portion 111 is fitted to the outer peripheral surface of the inner side opening 2a in the outer ring 2, a configuration using a core bar 11A in which the fitting portion 111A is fitted to the inner peripheral surface of the inner side opening 2a in the outer ring 2 can also be used.

[0087] [Sixth embodiment of inner seal member] The inner seal member 10 can also be configured as an inner seal member 10E shown in Fig. 7. The inner seal member 10E differs from the inner seal member 10 in that it has a seal member 12E instead of the seal member 12. The mouth portion 26 shown in Fig. 7 has a second protrusion 261 that protrudes radially outward from the outer circumferential surface 26b on the inner side of the inner seal member 10E. The second protrusion 261 has an outer side surface 261a that faces the outer side.

[0088] The seal member 12E has a base portion 121E integrally joined to the inner diameter side end portion of the side plate portion 112 of the core metal 11, a joint side seal lip 122E in contact with the outer peripheral surface 26b of the mouth portion 26 of the outer joint member 21, and a first inner ring side seal lip 123E and a second inner ring side seal lip 124E in contact with the inner side end face 4b of the inner ring 4. The first inner ring side seal lip 123E and the second inner ring side seal lip 124E are examples of inner ring side seal lips.

[0089] The joint side seal lip 122E is a contact lip that contacts the outer peripheral surface 26b of the mouth portion 26, and the first inner ring side seal lip 123E and the second inner ring side seal lip 124E are contact lips that contact the inner side end face 4b of the inner ring 4.

[0090] The joint side seal lip 122E extends from the base 121E toward the inner side and outer diameter side. The first inner ring side seal lip 123E extends from the base 121E toward the outer side and inner diameter side. The second inner ring side seal lip 124E extends from the base 121E toward the outer side and inner diameter side, on the outer diameter side of the first inner ring side seal lip 123E. The joint side seal lip 122E is in contact with the outer peripheral surface 26b of the mouth portion 26 on the inner side of the first inner ring side seal lip 123E and the second inner ring side seal lip 124E.

[0091] Specifically, the joint-side seal lip 122E contacts an outer side surface 261a of a second protrusion 261 formed on the outer peripheral surface b of the mouth portion . The second protruding portion 261 protrudes radially outward beyond the joint side seal lip 122E. The second protruding portion 261 is also located on the inner side beyond the joint side seal lip 122E.

[0092] In this way, in the inner side seal member 10E, the second protruding portion 261, which protrudes further outward than the joint side seal lip 122E, is located on the inner side of the joint side seal lip 122E, so that foreign matter such as muddy water from outside will hit the second protruding portion 261 before hitting the joint side seal lip 122E.

[0093] As a result, foreign matter such as muddy water from outside hits the second protrusion 261, weakens its momentum, and then comes into contact with the joint side seal lip 122E, making it possible to prevent foreign matter such as muddy water from entering the interior of the inner side seal member 10E.

[0094] Furthermore, the inner side seal member 10E has two seal lips, a first inner ring side seal lip 123E and a second inner ring side seal lip 124E, that contact the inner side end face 4b of the inner ring 4, so it is possible to further improve the muddy water resistance of the inner side seal member 10E compared to when there is only one seal lip that contacts the inner side end face 4b of the inner ring 4.

[0095] In addition, in the inner side seal member 10E, instead of the core bar 11 in which the fitting portion 111 is fitted to the outer peripheral surface of the inner side opening 2a in the outer ring 2, a configuration using a core bar 11A in which the fitting portion 111A is fitted to the inner peripheral surface of the inner side opening 2a in the outer ring 2 can also be used.

[0096] [Seventh embodiment of inner seal member] The inner seal member 10 can also be configured as an inner seal member 10F shown in Fig. 8. The inner seal member 10F differs from the inner seal member 10 in that it has a seal member 12F instead of the seal member 12. The mouth portion 26 shown in Fig. 8 has a second protrusion 261 that protrudes radially outward from the outer circumferential surface 26b on the inner side of the inner seal member 10F. The second protrusion 261 has an outer side surface 261a that faces the outer side.

[0097] The seal member 12F has a base portion 121F integrally joined to the inner diameter side end portion of the side plate portion 112 of the core metal 11, a first joint side seal lip 122F and a second joint side seal lip 123F that contact the outer peripheral surface 26b of the mouth portion 26 of the outer joint member 21, and an inner ring side seal lip 124F that contacts the inner side end face 4b of the inner ring 4. The first joint side seal lip 122F and the second joint side seal lip 123F are examples of joint side seal lips.

[0098] The first joint side seal lip 122F and the second joint side seal lip 123F are contact lips that come into contact with the outer peripheral surface 26b of the mouth portion 26, and the inner ring side seal lip 124F is a contact lip that comes into contact with the inner side end face 4b of the inner ring 4.

[0099] The first joint side seal lip 122F extends from the base 121F toward the inner side and inner diameter side. The second joint side seal lip 123F extends from the base 121F toward the inner side and inner diameter side, on the outer side of the first joint side seal lip 122F. The inner ring side seal lip 124F extends from the base 121F toward the outer side and inner diameter side. The first joint side seal lip 122F and the second joint side seal lip 123F are in contact with the outer peripheral surface 26b of the mouth portion 26 on the inner side of the inner ring side seal lip 124F.

[0100] Specifically, the first joint-side seal lip 122F and the second joint-side seal lip 123F are in contact with the outer peripheral surface 26b on the outer side of a second protruding portion 261 formed on the outer peripheral surface 26b of the mouth portion 26. The second protruding portion 261 protrudes radially outward from the first joint-side seal lip 122F. The second protruding portion 261 is also located on the inner side from the first joint-side seal lip 122F.

[0101] In this way, in the inner side seal member 10F, the second protruding portion 261, which protrudes more toward the outer diameter than the first joint side seal lip 122F, is located on the inner side of the first joint side seal lip 122F, so that foreign matter such as muddy water from outside will hit the second protruding portion 261 before hitting the first joint side seal lip 122F.

[0102] As a result, foreign matter such as muddy water from outside comes into contact with the first joint side seal lip 122F after hitting the second protrusion 261 and having its momentum weakened, making it possible to prevent foreign matter such as muddy water from entering the interior of the inner side seal member 10F.

[0103] Furthermore, the inner side seal member 10F has two seal lips, a first joint side seal lip 122F and a second joint side seal lip 123F, that contact the outer peripheral surface 26b of the mouth portion 26, which makes it possible to further improve the muddy water resistance of the inner side seal member 10F compared to when there is only one seal lip that contacts the outer peripheral surface 26b of the mouth portion 26.

[0104] In addition, in the inner side seal member 10F, instead of the core bar 11 in which the fitting portion 111 is fitted to the outer peripheral surface of the inner side opening 2a in the outer ring 2, a configuration using a core bar 11A in which the fitting portion 111A is fitted to the inner peripheral surface of the inner side opening 2a in the outer ring 2 can also be used.

[0105] [Eighth embodiment of inner seal member] The inner seal member 10 can also be configured as an inner seal member 10G shown in Fig. 9. The inner seal member 10G differs from the inner seal member 10 in that it has a core 11G instead of the core 11 and a seal member 12G instead of the seal member 12. The mouth portion 26 shown in Fig. 9 has a second protrusion 261 that protrudes radially outward from the outer circumferential surface 26b on the inner side of the inner seal member 10G. The second protrusion 261 has an outer side surface 261a that faces the outer side.

[0106] The core wire 11G has a cylindrical fitting portion 111G that is fitted onto the outer peripheral surface of the inner side opening 2a of the outer ring 2, a side plate portion 112G that extends from the fitting portion 111G toward the inner diameter side and is formed into a disk shape, and a third protrusion portion 113G that protrudes toward the inner side from the inner diameter side end portion of the side plate portion 112G.

[0107] The third protrusion 113G can be formed, for example, by folding back the inner diameter side end of the side plate 112G toward the inner side and then toward the outer side. The third protrusion 113G is located on the outer diameter side of the second protrusion 261 and overlaps with the second protrusion 261 when viewed from the radial direction.

[0108] The seal member 12G has a base portion 121G integrally joined to the inner diameter side end portion of the side plate portion 112G of the core metal 11G, a joint side seal lip 122G in contact with the outer peripheral surface 26b of the mouth portion 26 of the outer joint member 21, and a first inner ring side seal lip 123G and a second inner ring side seal lip 124G in contact with the inner side end face 4b of the inner ring 4. The first inner ring side seal lip 123G and the second inner ring side seal lip 124G are examples of inner ring side seal lips.

[0109] The joint side seal lip 122G is a contact lip that contacts the outer peripheral surface 26b of the mouth portion 26, and the first inner ring side seal lip 123G and the second inner ring side seal lip 124G are contact lips that contact the inner side end face 4b of the inner ring 4.

[0110] The joint side seal lip 122G extends from the base 121G toward the inner side and the outer diameter side. The first inner ring side seal lip 123G extends from the base 121G toward the outer side and the inner diameter side. The second inner ring side seal lip 124G extends from the base 121G toward the outer side and the inner diameter side, on the outer diameter side of the first inner ring side seal lip 123G. The joint side seal lip 122G is in contact with the outer peripheral surface 26b of the mouth portion 26 on the inner side of the first inner ring side seal lip 123G and the second inner ring side seal lip 124G.

[0111] Specifically, the joint-side seal lip 122G is in contact with an outer side surface 261a of a second protrusion 261 formed on the outer peripheral surface 26b of the mouth portion 26. The second protrusion 261 protrudes radially outward beyond the joint-side seal lip 122G. The second protrusion 261 is also located more inward than the joint-side seal lip 122G.

[0112] In this way, in the inner side seal member 10G, the second protruding portion 261, which protrudes further outward than the joint side seal lip 122G, is located on the inner side of the joint side seal lip 122G, so that foreign matter such as muddy water from outside will hit the second protruding portion 261 before hitting the joint side seal lip 122G.

[0113] As a result, foreign matter such as muddy water from outside hits the second protrusion 261, weakens its momentum, and then comes into contact with the joint side seal lip 122G, making it possible to prevent foreign matter such as muddy water from entering the interior of the inner side seal member 10G.

[0114] The second protrusion 261 of the mouth portion 26 and the third protrusion 113G of the core 11G are disposed with a radial gap between them. The second protrusion 261 has an opposing surface 261b opposing the third protrusion 113G, and the third protrusion 113G has an opposing surface 113Ga opposing the second protrusion 261.

[0115] The opposing surfaces 261b and 113Ga are both arranged parallel to the axial direction. In the inner seal member 10G, the opposing surface 261b of the second protrusion 261 and the opposing surface 113Ga of the third protrusion 113G form a second labyrinth seal LS2. The second labyrinth seal LS2 extends along the axial direction.

[0116] In this way, by forming the second labyrinth seal LS2 with the second protrusion 261 of the mouth portion 26 and the third protrusion 113G of the core wire 11G, the second labyrinth seal LS2 can prevent foreign matter such as muddy water from penetrating between the inner ring 4 and the mouth portion 26 through the gap between the inner side seal member 10G and the mouth portion 26, thereby improving the muddy water resistance of the inner side seal member 10G.

[0117] In this embodiment, the third protrusion 113G is formed by protruding the core metal 11G toward the inner side, but it is also possible to form the third protrusion by protruding the sealing member 12G from the base 121G toward the inner side.

[0118] Furthermore, in the inner side seal member 10G, the fitting portion 111G of the core metal 11G is fitted to the outer peripheral surface of the inner side opening 2a in the outer ring 2, but the fitting portion 111G can also be configured to fit to the inner peripheral surface of the inner side opening 2a.

[0119] Furthermore, the inner side seal member 10G has two seal lips, a first inner ring side seal lip 123G and a second inner ring side seal lip 124G, that contact the inner side end face 4b of the inner ring 4, so that the muddy water resistance of the inner side seal member 10G can be further improved compared to when there is only one seal lip that contacts the inner side end face 4b of the inner ring 4.

[0120] [Ninth embodiment of inner seal member] The inner seal member 10 can also be configured as an inner seal member 10H shown in Figure 10. The inner seal member 10H differs from the inner seal member 10 in that it has a seal member 12H instead of the seal member 12. The mouth portion 26 shown in Figure 10 has a second protrusion 261H that protrudes radially outward from the outer circumferential surface 26b on the inner side of the inner seal member 10H. The second protrusion 261H has an outer side surface 261Ha that faces the outer side.

[0121] The seal member 12H has a base portion 121H integrally joined to the inner diameter side end portion of the side plate portion 112 of the core metal 11, a joint side seal lip 122H in contact with the outer peripheral surface 26b of the mouth portion 26 of the outer joint member 21, a first inner ring side seal lip 123H and a second inner ring side seal lip 124H in contact with the inner side end face 4b of the inner ring 4, and a third protruding portion 125H protruding from the side plate portion 112 of the core metal 11 toward the inner side on the outer diameter side of the joint side seal lip 122H. The first inner ring side seal lip 123H and the second inner ring side seal lip 124H are examples of inner ring side seal lips.

[0122] The joint side seal lip 122H is a contact lip that contacts the outer peripheral surface 26b of the mouth portion 26, and the first inner ring side seal lip 123H and the second inner ring side seal lip 124H are contact lips that contact the inner side end face 4b of the inner ring 4.

[0123] The joint-side seal lip 122H extends from the base 121H toward the inner side and outer diameter side. The first inner-ring-side seal lip 123H extends from the base 121H toward the outer side and inner diameter side. The second inner-ring-side seal lip 124H extends from the base 121H toward the outer side and inner diameter side, on the outer diameter side of the first inner-ring-side seal lip 123H. The joint-side seal lip 122H is in contact with the outer peripheral surface 26b of the mouth portion 26 on the inner side of the first inner-ring-side seal lip 123H and the second inner-ring-side seal lip 124H.

[0124] Specifically, the joint-side seal lip 122H is in contact with an outer side surface 261Ha of a second protrusion 261H formed on the outer peripheral surface 26b of the mouth portion 26. The second protrusion 261H protrudes radially outward beyond the joint-side seal lip 122H. The second protrusion 261H is also located more inward than the joint-side seal lip 122H.

[0125] In this way, in the inner side seal member 10H, the second protruding portion 261H, which protrudes more radially outward than the joint side seal lip 122H, is located on the inner side of the joint side seal lip 122H, so that foreign matter such as muddy water from outside will hit the second protruding portion 261H before hitting the joint side seal lip 122H.

[0126] As a result, foreign matter such as muddy water from outside hits the second protrusion 261H, weakens its momentum, and then comes into contact with the joint side seal lip 122H, making it possible to prevent foreign matter such as muddy water from entering the interior of the inner side seal member 10H.

[0127] The second protrusion 261H of the mouth portion 26 and the third protrusion 125H of the seal member 12H are disposed with a radial gap between them. The second protrusion 261H has an opposing surface 261Hb that faces the third protrusion 125H, and the third protrusion 125H has an opposing surface 125Ha that faces the second protrusion 261H.

[0128] The opposing surfaces 261Hb and 125Ha are formed as inclined surfaces that incline radially outward from the inner side with respect to the axial direction. The opposing surface 261Hb of the second protruding portion 261H and the opposing surface 125Ha of the third protruding portion 125H are arranged so as to be parallel to each other.

[0129] In the inner seal member 10H, a second labyrinth seal LS2H is formed by the opposing surface 261Hb of the second protrusion 261H and the opposing surface 125Ha of the third protrusion 125H. The second labyrinth seal LS2H extends in a direction inclined radially outward toward the inner side relative to the axial direction.

[0130] In this way, by forming the second labyrinth seal LS2H with the second protrusion 261H of the mouth portion 26 and the third protrusion 125H of the seal member 12H, the second labyrinth seal LS2H can prevent foreign matter such as muddy water from penetrating between the inner ring 4 and the mouth portion 26 through the gap between the inner seal member 10H and the mouth portion 26, thereby improving the muddy water resistance of the inner seal member 10H.

[0131] In particular, because the second labyrinth seal LS2H is inclined axially from the inner side toward the outer diameter side, if muddy water enters the second labyrinth seal LS2H, the centrifugal force of the rotating mouth portion 26 can smoothly expel the entered muddy water to the outside of the second labyrinth seal LS2H, thereby further improving the muddy water resistance of the inner seal member 10H.

[0132] Furthermore, the inner side seal member 10H has two seal lips, a first inner ring side seal lip 123H and a second inner ring side seal lip 124H, that contact the inner side end face 4b of the inner ring 4, so the muddy water resistance of the inner side seal member 10H can be further improved compared to when there is only one seal lip that contacts the inner side end face 4b of the inner ring 4.

[0133] In this embodiment, the third protrusion 125H is formed by protruding the sealing member 12H toward the inner side, but it is also possible to form the third protrusion by protruding the side plate portion 112 of the core wire 11 toward the inner side.

[0134] In addition, in the inner side seal member 10H, instead of the core bar 11 in which the fitting portion 111 is fitted to the outer peripheral surface of the inner side opening 2a in the outer ring 2, a configuration can be adopted in which a core bar 11A in which the fitting portion 111A is fitted to the inner peripheral surface of the inner side opening 2a in the outer ring 2 is used.

[0135] [Tenth embodiment of inner seal member] The inner seal member 10 can also be configured as an inner seal member 10J shown in Figure 11. The inner seal member 10J differs from the inner seal member 10 in that it has a seal member 12J instead of the seal member 12. The mouth portion 26 shown in Figure 11 has a second protrusion 261J that protrudes radially outward from the outer circumferential surface 26b on the inner side of the inner seal member 10J. The second protrusion 261J has an outer side surface 261Ja that faces the outer side.

[0136] The seal member 12J has a base portion 121J integrally joined to the inner diameter side end portion of the side plate portion 112 of the core metal 11, a joint side seal lip 122J in contact with the outer peripheral surface 26b of the mouth portion 26 of the outer joint member 21, a first inner ring side seal lip 123J and a second inner ring side seal lip 124J in contact with the inner side end face 4b of the inner ring 4, and a third protruding portion 125J protruding from the side plate portion 112 of the core metal 11 toward the inner side on the outer diameter side of the joint side seal lip 122J. The first inner ring side seal lip 123J and the second inner ring side seal lip 124J are examples of inner ring side seal lips.

[0137] The joint side seal lip 122J is a contact lip that contacts the outer peripheral surface 26b of the mouth portion 26, and the first inner ring side seal lip 123J and the second inner ring side seal lip 124J are contact lips that contact the inner side end face 4b of the inner ring 4.

[0138] The joint side seal lip 122J extends from the base 121J toward the inner side and outer diameter side. The first inner ring side seal lip 123J extends from the base 121J toward the outer side and inner diameter side. The second inner ring side seal lip 124J extends from the base 121J toward the outer side and inner diameter side, on the outer diameter side of the first inner ring side seal lip 123J. The joint side seal lip 122J is in contact with the outer peripheral surface 26b of the mouth portion 26 on the inner side of the first inner ring side seal lip 123J and the second inner ring side seal lip 124J.

[0139] Specifically, the joint-side seal lip 122J is in contact with an outer side surface 261Ja of a second protrusion 261J formed on the outer peripheral surface 26b of the mouth portion 26. The second protrusion 261J protrudes radially outward beyond the joint-side seal lip 122J. The second protrusion 261J is also located more inward than the joint-side seal lip 122J.

[0140] In this way, in the inner side seal member 10J, the second protruding portion 261J, which protrudes more radially outward than the joint side seal lip 122J, is located on the inner side of the joint side seal lip 122J, so that foreign matter such as muddy water from outside will hit the second protruding portion 261J before hitting the joint side seal lip 122J.

[0141] As a result, foreign matter such as muddy water from the outside hits the second protrusion 261J, weakening its momentum, before coming into contact with the joint side seal lip 122J, making it possible to prevent foreign matter such as muddy water from entering the interior of the inner side seal member 10J.

[0142] The second protrusion 261J of the mouth portion 26 and the third protrusion 125J of the seal member 12J are disposed with a radial gap between them. The second protrusion 261J has an opposing surface 261Jb that faces the third protrusion 125J, and the third protrusion 125J has an opposing surface 125Ja that faces the second protrusion 261J.

[0143] The opposing surfaces 261Jb and 125Ja are formed as inclined surfaces that incline radially outward toward the inner side with respect to the axial direction. The inclination angle of the opposing surface 261Jb with respect to the axial direction is larger than the inclination angle of the opposing surface 125Ja with respect to the axial direction, and the gap between the opposing surfaces 261Jb and 125Ja becomes smaller toward the inner side.

[0144] In the inner seal member 10J, a second labyrinth seal LS2J is formed by the opposing surface 261Jb of the second protrusion 261J and the opposing surface 125Ja of the third protrusion 125J. The second labyrinth seal LS2J extends in a direction inclined radially outward from the inner side relative to the axial direction.

[0145] In this way, by forming the second labyrinth seal LS2J with the second protrusion 261J of the mouth portion 26 and the third protrusion 125J of the seal member 12J, the second labyrinth seal LS2J can prevent foreign matter such as muddy water from penetrating between the inner ring 4 and the mouth portion 26 through the gap between the inner side seal member 10J and the mouth portion 26, thereby improving the muddy water resistance of the inner side seal member 10J.

[0146] In particular, because the second labyrinth seal LS2J is inclined axially from the inner side toward the outer diameter side, if muddy water enters the second labyrinth seal LS2J, the centrifugal force of the rotating mouth portion 26 can smoothly expel the entered muddy water to the outside of the second labyrinth seal LS2J, thereby further improving the muddy water resistance of the inner seal member 10J.

[0147] In addition, in the second labyrinth seal LS2J, the gap between the opposing surface 261Jb and the opposing surface 125Ja becomes smaller toward the inner side, so the force of muddy water being discharged to the outside of the inner seal member 10J through the second labyrinth seal LS2J increases compared to when the opposing surface 261Jb and the opposing surface 125Ja are parallel, which makes it possible to prevent foreign matter such as muddy water from entering the second labyrinth seal LS2J from the outside.

[0148] Furthermore, the inner side seal member 10J has two seal lips, a first inner side seal lip 123J and a second inner side seal lip 124J, that contact the inner side end face 4b of the inner ring 4, so that the muddy water resistance of the inner side seal member 10J can be further improved compared to when there is only one seal lip that contacts the inner side end face 4b of the inner ring 4.

[0149] In this embodiment, the third protrusion 125J is formed by protruding the sealing member 12J toward the inner side, but it is also possible to form the third protrusion by protruding the side plate portion 112 of the core wire 11 toward the inner side.

[0150] In addition, in the inner side seal member 10J, instead of the core bar 11 in which the fitting portion 111 is fitted to the outer peripheral surface of the inner side opening 2a in the outer ring 2, a configuration using a core bar 11A in which the fitting portion 111A is fitted to the inner peripheral surface of the inner side opening 2a in the outer ring 2 can also be used.

[0151] [Eleventh embodiment of inner seal member] The inner seal member 10 can also be configured as an inner seal member 10K shown in Fig. 12. The inner seal member 10K differs from the inner seal member 10 in that it has a core metal 11K instead of the core metal 11.

[0152] The core metal 11K is fitted into an inner-side opening 2a at the inner-side end of the outer ring 2. The core metal 11K is fitted into the outer peripheral surface of the inner-side opening 2a of the outer ring 2 and has a cylindrical fitting portion 111K, and extends radially inward from the fitting portion 111K and is formed into a disk shape.

[0153] The side plate portion 112K has an outer diameter portion 112Ka connected to the fitting portion 111K, an inner diameter portion 112Kb located radially inward and on the inner side of the outer diameter portion 112Ka, and a step portion 112Kc connecting the outer diameter portion 112Ka and the inner diameter portion 112Kb. In other words, the inner diameter portion 112Kb protrudes more inward than the outer diameter portion 112Ka, and a step portion 112Kc extending along the axial direction is formed between the inner diameter portion 112Kb and the outer diameter portion 112Ka. A seal member 12 is integrally joined to the inner diameter end of the inner diameter portion 112Kb of the side plate portion 112K.

[0154] In this way, since the side plate portion 112K has an outer diameter portion 112Ka and an inner diameter portion 112Kb connected to the outer diameter portion 112Ka by the step portion 112Kc, foreign matter such as muddy water that flows from the inner side end of the outer ring 2 to the core wire 11 flows along the outer diameter portion 112Ka of the side plate portion 112K toward the inner diameter side, and even if it hits the step portion 112Kc, it can be prevented from then flowing along the step portion 112Kc toward the road surface and hitting the joint side seal lip 122.

[0155] This prevents foreign matter such as muddy water that has flowed from the inner end of the outer ring 2 onto the core wire 11 from directly hitting the joint side seal lip 122, thereby improving the muddy water resistance of the inner side seal member 10K.

[0156] In the inner side seal member 10K, the fitting portion 111K is fitted to the outer peripheral surface of the inner side opening 2a in the outer ring 2, but it is also possible to configure the fitting portion 111K to fit to the inner peripheral surface of the inner side opening 2a.

[0157] Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, which are merely examples, and it goes without saying that the present invention can be embodied in various other forms without departing from the spirit of the present invention. The scope of the present invention is indicated by the claims, and further includes the equivalent meanings set forth in the claims, and all modifications within the scope of the claims. [Explanation of symbols]

[0158] 1 Wheel bearing device 2 outer ring 2c (inner side) outer raceway 2d (Outer side) outer raceway 3 Hub Wheel 3c Inner raceway surface 3e Through hole 3m Contact position (on the inner raceway of the hub ring) 4. Inner Circle 4a Inner raceway surface 4b Inner end face 4f 1st protrusion 4A Inner ring fitting part 4B Big end 4C tapered section 5 Inner ball row 6 Outer ball row 10, 10A~10H, 10J, 10K Inner seal material 11, 11A, 11G, 11K core metal 12, 12B~12H, 12J sealing material 20 Constant velocity universal joint 25 track groove 25a groove bottom 26 Mouse section 26b Outer surface 27 Stem 41 (inner ring fitting part) inner peripheral surface 42 (big end) inner surface 43 Contact position (on the inner raceway of the inner ring) 111, 111A, 111G, 111K mating part 112, 112A, 112G, 112K side plate part 112Ka outer diameter 112Kb inner diameter 112Kc step 113G, 125H, 125J 3rd protrusion 122, 122F First joint side seal lip 123, 123F Second joint side seal lip 122B~122E, 122G, 122H, 122J Joint side seal lip 123B~123D, 124F Inner ring seal lip 123E, 123G, 123H, 123J No. 1 inner ring seal lip 124E, 124G, 124H, 124J Second inner ring seal lip 261, 261H, 261J 2nd protrusion LS1 First labyrinth seal LS2, LS2H, LS2J Second labyrinth seal S Annular Space

Claims

1. an outer member having a double-row outer raceway surface on its inner periphery; an inner member including a hub wheel having a through hole penetrating in the axial direction in an inner diameter portion and having an inner raceway surface on one axial side opposed to the outer raceway surface on one axial side; and an inner ring fitted to the hub wheel and having an inner raceway surface on the other axial side opposed to the outer raceway surface on the other axial side; double-row rolling elements rollably accommodated between the raceway surfaces of the outer member and the inner member; a constant velocity universal joint having a mouth portion having track grooves formed on an inner peripheral surface thereof, and a fitting portion extending axially from the mouth portion and capable of fitting into the through hole of the hub wheel; a sealing device that closes an open end on the other axial side of an annular space formed by the outer member and the inner member; A wheel bearing device comprising: a contact position between the inner raceway surface on the other axial side of the inner member and the rolling elements is located on the outer diameter side of the groove bottom of the track groove in the mouth portion, The inner ring is an inner ring fitting portion that is fitted onto the hub wheel; a large end portion located on the other axial side of the inner ring fitting portion and having a larger diameter than the inner ring fitting portion, the big end includes a big end surface facing the other axial direction, The sealing device is a core bar including a fitting portion that is fitted to the outer member and a side plate portion that extends from the fitting portion toward an inner diameter side; a seal member integrally joined to the side plate portion of the core metal and having a joint-side seal lip that contacts the outer peripheral surface of the mouth portion.

2. 2. The wheel bearing device according to claim 1, wherein the seal member has an inner ring side seal lip that contacts the large end face of the inner ring.

3. the large end face of the inner ring has a first protruding portion on an inner diameter side that protrudes toward the other axial side, 3. The wheel bearing device according to claim 1, wherein the first protrusion and the seal member form a first labyrinth seal.

4. 3. The wheel bearing device according to claim 1, wherein the mouth portion has a second protruding portion that protrudes radially outward from the outer circumferential surface on the other axial side of the seal member.

5. the sealing device has a third protruding portion protruding from the side plate portion of the core metal toward the other axial side, 5. The wheel bearing device according to claim 4, wherein the third protrusion and the second protrusion form a second labyrinth seal.

6. 6. The wheel bearing device according to claim 5, wherein the second labyrinth seal is inclined radially outward relative to the axial direction toward the other axial side.

7. 6. The wheel bearing device according to claim 5, wherein a gap between the third protruding portion and the second protruding portion that forms the second labyrinth seal becomes smaller toward the other side in the axial direction.

8. The side plate portion of the core metal is an outer diameter portion connected to the fitting portion; an inner diameter portion located on the inner diameter side of the outer diameter portion and on the other axial side; a step portion connecting the outer diameter portion and the inner diameter portion; 3. The wheel bearing device according to claim 1, further comprising:

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