Wheel rolling bearing device

Abstract

In a wheel rolling bearing device equipped with a seal device having a deflector portion, damage to the seal device due to the deflector portion becoming entangled is suppressed. [Solution] The bearing device 10 comprises an outer member 20 and a first seal device 61 which is assembled to the outer member 20 and comprises a seal portion 64 and a metal ring 63. The metal ring 63 supports the seal portion 64 in the first portion 61X and the third portion 61Z of the first seal device 61. The seal portion 64 has a deflector portion 67 which includes a first deflector portion 67X which constitutes the second portion 61Y of the first seal device 61 and a second deflector portion 67Y which constitutes the third portion 61Z. The first deflector portion 67X has a projection 68 which extends in one axial direction from the connection portion 67Z with the second deflector portion 67Y and protrudes radially inward from the inner circumferential surface 67a of the first deflector portion 67X, and a guide portion 69 which extends in one axial direction from the projection 68.

Description

[[TECHNICAL FIELD]]

[0001] The present disclosure relates to a rolling bearing device for a wheel. [[BACKGROUND ART]]

[0002] Conventionally, there has been known a rolling bearing device for a wheel including a sealing device having a deflector portion for suppressing intrusion of foreign matter such as muddy water into the interior of the bearing (see Patent Document 1). Such a sealing device is also referred to as a deflector seal.

[0003] FIG. 6 is a cross-sectional view of a conventional sealing device provided with a deflector portion. FIG. 7 is a diagram illustrating a press-fitting state of an outer member with respect to a conventional sealing device. FIGS. 6 and 7 show a conventional sealing device provided with a deflector portion. As shown in FIG. 7, a conventional sealing device 160 is used by being assembled to an outer member 120 that constitutes a rolling bearing device for a wheel.

[0004] As shown in FIG. 6, the conventional sealing device 160 is composed of a first portion 160X, a second portion 160Y, and a third portion 160Z. The first portion 160X is a portion arranged radially inward of the outer member 120 when assembled to the outer member 120 (see FIG. 7), and extends in the axial direction of the outer member 120. The second portion 160Y is a portion arranged radially outward of the outer member 120 when assembled to the outer member 120, and extends in the axial direction of the outer member 120. The third portion 160Z is a portion connecting the first portion 160X and the second portion 160Y, and extends in the radial direction of the outer member 120. The sealing device 160 further includes a groove 161 into which the outer member 120 is press-fitted. The groove 161 is a substantially cylindrical recess surrounded by the first portion 160X, the second portion 160Y, and the third portion 160Z.

[0005] The sealing device 160 includes a metal ring 163 and a seal portion 164 integrated with the metal ring 163. The metal ring 163 has a first annular portion 163a, a cylindrical portion 163b, a second annular portion 163c, and an inclined portion 163d.

[0006] The seal portion 164 is made of resin (rubber in this embodiment) and includes a main body portion 165 supported by a cylindrical portion 163b, a second annular portion 163c, and an inclined portion 163d, a lip portion 166 extending radially inward and axially from the main body portion 165, and a deflector portion 167 extending radially outward from the main body portion 165.

[0007] The deflector portion 167 constitutes part of the second portion 160Y and the third portion 160Z of the sealing device 160. The portion of the deflector portion 167 that constitutes the second portion 160Y is referred to as the first deflector portion 167X, and the portion of the deflector portion 167 that constitutes the third portion 160Z is referred to as the second deflector portion 167Y. The first deflector portion 167X is a portion that extends in the axial direction, and the second deflector portion 167Y is a portion that extends in the radial direction.

[0008] The deflector section 167 further has a connecting section 167Z that connects the first deflector section 167X and the second deflector section 167Y. The first deflector section 167X extends from the connecting section 167Z in one axial direction.

[0009] The second deflector portion 167Y is supported by the first annular portion 163a. ​​On the other hand, the first deflector portion 167X is not supported by the metal ring 163. Therefore, the first deflector portion 167X can be elastically deformed (bent) in the radial direction.

[0010] The deflector portion 167 is further provided with a projection 168. The projection 168 protrudes radially inward from the inner circumferential surface 167a of the first deflector portion 167X toward the groove portion 161. By providing the projection 168, the deflector portion 167 ensures a tight fit with respect to the outer member 120. The projection 168 contacts the outer circumferential surface 123 (see Figure 7) of the outer member 120, suppressing the intrusion of foreign matter such as muddy water through the gap between the first deflector portion 167X and the outer circumferential surface 123.

[0011] As shown in Figure 7, in a sealing device 160 equipped with a deflector portion 167 having a projection 168, the outer member 120 is press-fitted into the groove 161. The outer member 120 is press-fitted into the groove 161 until its axial end 124 contacts the second deflector portion 167Y (third portion 160Z). When the outer member 120 is press-fitted into the groove 161, the outer member 120 is positioned on one axial side, the sealing device 160 is positioned on the other axial side, and with the centerlines of the outer member 120 and the sealing device 160 aligned, the outer member 120 and the sealing device 160 are moved relative to each other in the axial direction to press-fit the outer member 120 into the groove 161.

[0012] At this time, the first deflector portion 167X is curved radially outward as the projection 168 comes into contact with the outer circumferential surface 123. As the projection 168 moves axially in one direction while in contact with the outer circumferential surface 123, the projection 168 receives a force acting in the direction of arrow A shown in Figure 7, due to the frictional force generated between it and the outer circumferential surface 123 acting as resistance. As a result of receiving this force, the projection 168 is drawn inward radially of the first deflector portion 167X. The first deflector portion 167X is particularly prone to the projection 168 being drawn in if there is no metal ring 163 on the radially inward side of the projection 168. [Prior art documents] [Patent Documents]

[0013] [Patent Document 1] Japanese Patent Publication No. 2024-061144 [Overview of the project] [Problems that the invention aims to solve]

[0014] As explained in Figures 6 and 7, in conventional sealing devices with a deflector portion, when the outer member is press-fitted, the protrusion may become caught in the radially inward direction of the deflector portion and be damaged. Furthermore, if the protrusion becomes caught, the sealing device may not be assembled in a proper state, which may lead to a decrease in sealing performance.

[0015] This disclosure aims to suppress damage to a wheel rolling bearing device equipped with a deflector portion due to the deflector portion becoming entangled. [Means for solving the problem]

[0016] A rolling bearing device for a wheel according to the present disclosure comprises an outer member, an inner member, rolling elements disposed between the outer member and the inner member, and a sealing device assembled to the outer member, comprising a resin sealing portion and a metal ring supporting the sealing portion, wherein the sealing device comprises a cylindrical first portion extending axially from the outer member and disposed radially inward from the outer member, a cylindrical second portion extending axially from the outer member and disposed radially outward from the outer member, and a portion extending radially from the outer member and axially from the outer member The metal ring has an annular third portion that contacts the end and connects the first portion and the second portion, the first portion and the third portion support the seal portion, the seal portion has a deflector portion including a first deflector portion that constitutes the second portion and a second deflector portion that constitutes the third portion, the first deflector portion has a projection that extends in one axial direction from the connection portion with the second deflector portion and protrudes radially inward from the inner circumferential surface of the first deflector portion and a guide portion that extends in one axial direction from the projection. [Effects of the Invention]

[0017] According to the wheel rolling bearing device of this disclosure, in a wheel rolling bearing device equipped with a seal device having a deflector portion, damage to the seal device due to the deflector portion becoming entangled can be suppressed. [Brief explanation of the drawing]

[0018] [Figure 1] Figure 1 is a cross-sectional view showing an example of a rolling bearing device for a wheel according to the present disclosure. [Figure 2]Fig. 2 is a partial cross-sectional view showing the sealing device in a state assembled to a wheel rolling bearing device. [Figure 3] Fig. 3 is a cross-sectional view showing the sealing device of the present disclosure provided with a deflector portion. [Figure 4] Fig. 4 is a cross-sectional view showing the press-fitting state (at the start point) of the outer member to the sealing device. [Figure 5] Fig. 5 is a cross-sectional view showing the press-fitting state (at the completion point) of the outer member to the sealing device. [Figure 6] Fig. 6 is a cross-sectional view of a conventional sealing device provided with a deflector portion. [Figure 7] Fig. 7 is a cross-sectional view showing the press-fitting state of the outer member to the conventional sealing device. DETAILED DESCRIPTION OF THE INVENTION

[0019] <Details of Embodiments of the Invention of the Present Disclosure> Hereinafter, embodiments of the invention of the present disclosure will be described.

[0020] [Overall Configuration of Wheel Rolling Bearing Device] Fig. 1 is a cross-sectional view showing an example of the wheel rolling bearing device of the present disclosure. Fig. 2 is a partial cross-sectional view showing the sealing device in a state assembled to a wheel rolling bearing device. A wheel rolling bearing device 10 (hereinafter referred to as "bearing device 10") shown in Fig. 1 is a bearing device for wheels used in automobiles, and is also called a hub unit. The bearing device 10 is attached to a suspension device provided on a vehicle body of an automobile, and rotatably supports a wheel W and a disc rotor (not shown) of a brake device.

[0021] The bearing device 10 comprises a cylindrical outer member 20, an inner member 30 having a portion located radially inward, a plurality of rolling elements (balls) 40 arranged in two rows between the outer member 20 and the inner member 30, an annular cage 50 that holds the plurality of rolling elements 40, and a sealing device 60. In an unloaded state, the central axis of the outer member 20 and the central axis of the inner member 30 coincide. These central axes are referred to as the central axis C of the bearing device 10. Figure 1 is a cross-sectional view in a plane including the central axis C.

[0022] The sealing device 60 includes a first sealing device 61 and a second sealing device 62. The configuration of the first sealing device 61 will be described in detail later. In this description, a detailed explanation of the second sealing device 62 will be omitted, but the second sealing device 62 may have the same configuration as the first sealing device 61. That is, the second sealing device 62 may have a deflector portion similar to the deflector portion 67 of the first sealing device 61 (see Figures 2 and 3), which will be described later.

[0023] With respect to the bearing device 10 of this disclosure, the directions are defined below. The direction along the central axis C of the bearing device 10 is the "axial direction". Note that the "axial direction" includes the direction parallel to the central axis C. In the bearing device 10, one axial side (left side in Figure 1) is the vehicle inner side, and the opposite axial side (right side in Figure 1) is the vehicle outer side. The direction perpendicular to the central axis C is the "radial direction", and the direction along the circle centered on the central axis C is the "circumferential direction".

[0024] The outer member 20 has a fixing flange 21 on its outer circumference, which is fixed to a part of the suspension system (not shown). The outer member 20 has an outer raceway surface 22 on its inner circumference. The outer raceway surface 22 includes a first outer raceway surface 22a and a second outer raceway surface 22b.

[0025] The inner member 30 has an inner shaft 31 and an inner ring 32 attached to the inner side of the inner shaft 31 on the vehicle's inner side. The inner member 30 rotates in the "circumferential direction" about the central axis C. The inner shaft 31 has a shaft body 33 and a flange portion 34 to which the wheel W is attached using mounting bolts B, etc. The flange portion 34 is provided extending radially outward from the outer end 33a of the shaft body 33 on the vehicle's outer side. The inner ring 32 is fixed to the inner portion 33b of the shaft body 33 on the vehicle's inner side with a clamping allowance. The inner ring 32 has a first inner raceway surface 35 on its outer circumference. The inner shaft 31 has a second inner raceway surface 36 on its outer circumference.

[0026] The rolling element 40 on the inner side of the vehicle is provided to roll freely between the first outer raceway surface 22a and the first inner raceway surface 35, and contacts the first outer raceway surface 22a and the first inner raceway surface 35 at a contact angle. The rolling element 40 on the outer side of the vehicle is provided to roll freely between the second outer raceway surface 22b and the second inner raceway surface 36, and contacts the second outer raceway surface 22b and the second inner raceway surface 36 at a contact angle.

[0027] As shown in Figures 1 and 2, the first sealing device 61 seals the vehicle outer side opening 11 between the outer member 20 and the inner member 30 (inner shaft 31). The second sealing device 62 seals the vehicle inner side opening 12 between the outer member 20 and the inner member 30 (inner ring 32). The first sealing device 61 and the second sealing device 62 prevent foreign matter such as muddy water from entering the inside of the bearing where the rolling elements 40 are located, between the outer member 20 and the inner member 30.

[0028] [Detailed configuration of the first sealing device] Figure 3 is a cross-sectional view showing a sealing device of the present disclosure equipped with a deflector portion. Here, the configuration of the first sealing device 61 of the sealing device 60 will be described in detail. The first sealing device 61 is a so-called deflector seal and is equipped with a deflector portion 67 as shown in Figures 1 and 2. In this embodiment, only the first sealing device 61 of the sealing device 60 is shown as a deflector seal having a deflector portion 67, but the second sealing device 62 may also be a deflector seal. In this case, the second sealing device 62 has the same configuration as the first sealing device 61 which will be described below.

[0029] As shown in Figure 3, the first sealing device 61 is composed of a first part 61X, a second part 61Y, and a third part 61Z. The first part 61X of the first sealing device 61 is the part that is positioned radially inward of the outer member 20 (see Figure 2) when assembled to the outer member 20, and extends in the axial direction of the outer member 20. The second part 61Y of the first sealing device 61 is the part that is positioned radially outward of the outer member 20 (see Figure 2) when assembled to the outer member 20, and extends in the axial direction of the outer member 20. The third part 61Z of the first sealing device 61 is the part that connects the first part 61X and the second part 61Y, and extends radially of the outer member 20.

[0030] The first sealing device 61 has a groove 61a. The groove 61a is a substantially cylindrical recess surrounded by a first portion 61X, a second portion 61Y, and a third portion 61Z, into which the outer member 20 is press-fitted. The first sealing device 61 is assembled to the outer member 20 by press-fitting the outer member 20 into the groove 61a.

[0031] The first sealing device 61 has a metal ring 63 and a sealing portion 64 integrated with the metal ring 63. The metal ring 63 is composed of a first annular portion 63a, a cylindrical portion 63b, a second annular portion 63c, and an inclined portion 63d. The first annular portion 63a is a portion that extends radially and has an annular shape. The cylindrical portion 63b is a portion that extends from the radially inner end of the first annular portion 63a to one side in the axial direction and has a cylindrical shape. The second annular portion 63c is a portion that extends radially and has an annular shape. The inclined portion 63d is a portion that connects the axially inner end of the cylindrical portion 63b to the radially outer end of the second annular portion 63c and extends in a direction inclined with respect to the axial and radial directions.

[0032] The sealing portion 64 is made of resin (in this embodiment, it is made of rubber) and has a main body portion 65 supported by a cylindrical portion 63b, a second annular portion 63c, and an inclined portion 63d, a lip portion 66 extending radially inward and axially from the main body portion 65, and a deflector portion 67 extending radially outward from the main body portion 65.

[0033] The lip portion 66 includes a radial lip 66a extending radially inward from the main body portion 65, and a first axial lip 66b and a second axial lip 66c extending axially in the other direction from the main body portion 65. The radial lip 66a contacts the outer circumferential surface 37 of the shaft body 33. The first axial lip 66b and the second axial lip 66c contact the flange portion 34. The lip portion 66 prevents foreign matter such as muddy water from entering through the opening 11 on the vehicle outer side between the outer member 20 and the inner member 30 (inner shaft 31).

[0034] As shown in Figure 3, the deflector portion 67 constitutes part of the second portion 61Y and part of the third portion 61Z of the first sealing device 61. In the following description, the portion of the deflector portion 67 that constitutes the second portion 61Y will be referred to as the first deflector portion 67X, and the portion of the deflector portion 67 that constitutes the third portion 61Z will be referred to as the second deflector portion 67Y. The deflector portion 67 suppresses the intrusion of foreign matter such as muddy water through the gap between the outer member 20 and the metal ring 63 (first annular portion 63a and cylindrical portion 63b).

[0035] As shown in Figures 2 and 3, the deflector portion 67 further has a connecting portion 67Z that connects the first deflector portion 67X and the second deflector portion 67Y. The first deflector portion 67X extends from the connecting portion 67Z in one axial direction, and the second deflector portion 67Y extends radially inward from the connecting portion 67Z. The connecting portion 67Z is a portion that bulges out in the other axial direction from the first deflector portion 67X and the second deflector portion 67Y, and plays a role in narrowing the gap (opening 11) between the outer member 20 and the flange portion 34.

[0036] The second deflector portion 67Y is supported by the first annular portion 63a of the metal ring 63. On the other hand, the first deflector portion 67X is not supported by the metal ring 63. Therefore, the first deflector portion 67X, which constitutes the second portion 61Y, can elastically deform (bend) radially with the end on the connecting portion 67Z side as a fulcrum.

[0037] The deflector portion 67 is further provided with a projection 68. The projection 68 protrudes radially inward from the inner circumferential surface 67a of the first deflector portion 67X toward the groove portion 61a. By providing the projection 68, the deflector portion 67 ensures a tight fit with respect to the outer member 20 which is press-fitted into the groove portion 61a. The projection 68 contacts the outer circumferential surface 23 of the outer member 20, suppressing the intrusion of foreign matter such as muddy water through the gap between the first deflector portion 67X and the outer circumferential surface 23. In the case of the deflector portion 67 of this embodiment, where there is no metal ring 63 radially inward of the projection 68 in the first deflector portion 67X, the projection 68 is particularly prone to getting caught.

[0038] The deflector portion 67 further comprises a guide portion 69. The guide portion 69 is a part that extends further axially from the projection portion 68. In this embodiment, the radial dimension (thickness) of the guide portion 69 is approximately the same as the radial dimension (thickness) of the first deflector portion 67X.

[0039] The guide portion 69 restricts the deformation (inward rotation in the radial direction) of the first deflector portion 67X when the outer member 20 is pressed into the groove portion 61a of the first sealing device 61. In other words, the guide portion 69 suppresses the inward rotation of the projection portion 68 in the radial direction. When deformation (inward rotation in the radial direction) occurs in the projection portion 68 of the first sealing device 61, the guide portion 69 comes into contact with the outer peripheral surface 23 of the outer member 20, thereby restricting further deformation with the projection portion 68 as a fulcrum.

[0040] The guide portion 69 suppresses misalignment (radial positional misalignment and axial tilt misalignment) between the first deflector portion 67X and the outer member 20 when the outer member 20 is pressed into the groove portion 61a of the first sealing device 61. By having the guide portion 69, the first sealing device 61 and the outer member 20 can be easily positioned.

[0041] In the first sealing device 61 of this embodiment, the radius r1 of the inner circumferential surface 69a of the guide portion 69 is approximately equal to the radius r2 of the inner circumferential surface 67a of the first deflector portion 67X on the other axial side of the projection portion 68. Here, "approximately equal" includes cases where radii r1 and r2 are exactly the same, and cases where the difference between radii r1 and r2 is small and they can be considered identical.

[0042] In the first sealing device 61 with this configuration, the guide portion 69 provided at the tip on one axial side is easily positioned relative to the outer member 20. The first sealing device 61 can be positioned relative to the outer member 20 by positioning the guide portion 69 relative to the outer member 20. The first sealing device 61 with this configuration is easily positioned radially relative to the outer member 20. In the first sealing device 61 of this embodiment, the radius r1 of the inner circumferential surface 69a of the guide portion 69 may be clearly different from the radius r2 of the inner circumferential surface 67a of the first deflector portion 67X on the other axial side of the projection portion 68.

[0043] In the bearing device 10 of this embodiment, the projection 68 has a triangular outer shape in a cross-section including the central axis C. The projection 68 with this configuration has a tip portion 68a formed at the radially inward end, a first inclined surface 68b extending from the tip portion 68a toward the guide portion 69, and a second inclined surface 68c extending from the tip portion 68a toward the first deflector portion 67X on one axial side of the projection 68.

[0044] In the bearing device 10 of this embodiment, it is preferable that the width w1 of the first inclined surface 68b in the axial direction is larger than the width w2 of the second inclined surface 68c in the axial direction (w1 > w2). With such a configuration, the inclination angle of the first inclined surface 68b with respect to the inner circumferential surface 67a can be made smaller than the inclination angle of the second inclined surface 68c with respect to the inner circumferential surface 67a. In this case, the frictional force generated between the projection 68 and the outer circumferential surface 23 when the outer member 20 is pressed into the first seal device 61 can be reduced, thereby more reliably suppressing the inward rotation of the projection 68 into the radially inward direction of the first deflector portion 67X. In this case, the press-fitting of the outer member 20 into the first seal device 61 can be performed more smoothly.

[0045] Furthermore, with such a configuration, the inclination angle of the second inclined surface 68c with respect to the inner circumferential surface 67a can be made larger than the inclination angle of the first inclined surface 68b with respect to the inner circumferential surface 67a. In this case, when attempting to pull out the outer member 20 that has been press-fitted into the groove 61a, the frictional force generated between the projection 68 and the outer circumferential surface 23 can be increased, thereby reliably preventing the first sealing device 61 from falling off the outer member 20.

[0046] [Regarding the press-fitting status of the first sealing device to the outer member] Figure 4 is a cross-sectional view showing the press-fitting of the outer member into the seal device (start time). Figure 5 is a cross-sectional view showing the press-fitting of the outer member into the seal device (completion time). As shown in Figure 4, in the bearing device 10 of this disclosure, the outer member 20 is positioned on one axial side and the first seal device 61 is positioned on the other axial side with the center line of the outer member 20 and the center line of the first seal device 61 aligned. Then, the first seal device 61 is moved to one axial side to press-fit the outer member 20 into the groove 61a of the first seal device 61. Before press-fitting, the guide portion 69 of the first seal device 61 is positioned along the outer circumferential surface 23 of the outer member 20. At this time, the first seal device 61 and the outer member 20 are positioned so that the center line of the outer member 20 and the center line of the first seal device 61 are parallel. In other words, the first sealing device 61 and the outer member 20 have their axial tilt deviations suppressed by aligning the guide portion 69 with the outer peripheral surface 23 of the outer member 20.

[0047] Next, as shown in Figure 5, the first sealing device 61 is moved further axially to one side, and the outer member 20 is press-fitted into the groove 61a. The outer member 20 is press-fitted into the groove 61a until its axial end 24 contacts the second deflector portion 67Y (third portion 61Z). At this point, the first sealing device 61 and the outer member 20 are configured as a sealing assembly 70.

[0048] When the outer member 20 is press-fitted into the groove 61a, the first deflector portion 67X is elastically deformed (bent) such that one end on the axial side is displaced radially outward as the projection 68 comes into contact with the outer circumferential surface 23.

[0049] When the projection 68 moves axially to one side while in contact with the outer circumferential surface 23, a frictional force is generated between it and the outer circumferential surface 23. This frictional force causes the projection 68 to deform so as to be drawn radially inward into the first deflector portion 67X. In the first sealing device 61 of this disclosure, when the projection 68 is subjected to the aforementioned force, the guide portion 69 contacts the outer circumferential surface 23 of the outer member 20. Therefore, the first sealing device 61 of this disclosure can restrict the radially inward deformation of the first deflector portion 67X (the drawing in of the projection 68). In this way, the first sealing device 61 of this disclosure can restrict the deformation of the projection 68 during press-fitting of the outer member 20 by the guide portion 69. Furthermore, the bearing device 10 of this disclosure can suppress damage to the deflector portion 67 due to the drawing in of the projection 68 during press-fitting of the outer member 20 into the first sealing device 61. Furthermore, if the projection 68 does not get caught, the first sealing device 61 can be assembled in the correct position, thereby suppressing a decrease in sealing performance.

[0050] In this embodiment, only the first seal device 61 is moved axially to press-fit the outer member 20 into the first seal device 61. However, in the bearing device 10 of this disclosure, only the outer member 20 may be moved axially to press-fit the outer member 20 into the first seal device 61, or both the first seal device 61 and the outer member 20 may be moved axially to press-fit the outer member 20 into the first seal device 61.

[0051] As shown in Figure 3, in the bearing device 10 of this embodiment, it is preferable that the end face 69b of the axial guide portion 69 is positioned on the other axial side compared to the axial end of the metal ring 63. In this case, when the outer member 20 is press-fitted into the first seal device 61, the metal ring 63 can be brought into contact with the outer member 20 before the guide portion 69 comes into contact with the outer member 20. As a result, even if the guide portion 69 is provided on the deflector portion 67, the guide portion 69 does not obstruct the press-fitting of the metal ring 63 into the inner diameter side of the outer member 20.

[0052] [Regarding the operation and effects of this embodiment] The bearing device 10 of this embodiment is a rolling bearing device for a wheel, comprising an outer member 20, an inner member 30, rolling elements 40 disposed between the outer member 20 and the inner member 30, and a first seal device 61 assembled to the outer member 20, comprising a resin seal portion 64 and a metal ring 63 supporting the seal portion 64. In the bearing device 10 of this embodiment, the first seal device 61 has a cylindrical first portion 61X extending axially from the outer member 20 and disposed radially inward from the outer member 20, a cylindrical second portion 61Y extending axially from the outer member 20 and disposed radially outward from the outer member 20, and an annular third portion 61Z extending radially from the outer member 20, contacting the axial end 24 of the outer member 20 and connecting the first portion 61X and the second portion 61Y. The metal ring 63 supports the seal portion 64 in the first portion 61X and the third portion 61Z. The seal portion 64 has a deflector portion 67 which includes a first deflector portion 67X that constitutes a second portion 61Y and a second deflector portion 67Y that constitutes a third portion 61Z. The first deflector portion 67X has a projection 68 that extends in one axial direction from the connection portion 67Z with the second deflector portion 67Y and protrudes radially inward from the inner circumferential surface 67a of the first deflector portion 67X, and a guide portion 69 that extends in one axial direction from the projection 68.

[0053] According to the bearing device 10 of this embodiment, when the outer member 20 is pressed into the first seal device 61, the guide portion 69 restricts the displacement of the projection 68, thereby suppressing the inward rotation of the projection 68 into the radially inward direction of the first deflector portion 67X. Therefore, according to the bearing device 10 of this embodiment, in a wheel rolling bearing device 10 equipped with a first seal device 61 having a deflector portion 67, damage to the first seal device 61 due to the inward rotation of the deflector portion 67 can be suppressed.

[0054] In the bearing device 10 of this embodiment, the radius r1 of the inner circumferential surface 69a of the guide portion 69 is approximately equal to the radius r2 of the inner circumferential surface 67a of the second portion 61Y on the axial side of the projection 68 (r1 ≈ r2). For example, if the first deflector portion 67X does not have a projection 68, the first seal device 61 can be easily positioned radially relative to the outer member 20 by aligning its inner circumferential surface 67a with the outer circumferential surface 23. On the other hand, if a projection 68 is provided, even if the projection 68 is aligned with the outer circumferential surface 23, the first seal device 61 may be positioned misaligned with the outer member 20, making radial positioning difficult. As in the first sealing device 61 of this embodiment, when the radius r1 of the inner circumferential surface 69a of the guide portion 69 is made approximately equal to the radius r2 of the inner circumferential surface 67a, the first sealing device 61 can be easily positioned radially relative to the outer member 20 by aligning the inner circumferential surface 69a with the outer circumferential surface 23. Therefore, according to the bearing device 10 of this embodiment, the guide portion 69 and the first deflector portion 67X make it easier to position the first sealing device 61 radially.

[0055] In the bearing device 10 of this embodiment, the projection 68 has a tip portion 68a formed at the radially inward end, a first inclined surface 68b extending from the tip portion 68a toward the guide portion 69, and a second inclined surface 68c extending from the tip portion 68a toward the inner circumferential surface 67a of the second portion 61Y on the other axial side from the projection 68, wherein the width w1 of the first inclined surface 68b in the axial direction is larger than the width w2 of the second inclined surface 68c in the axial direction (w1>w2). According to the bearing device 10 of this embodiment, the inclination angle of the first inclined surface 68b with respect to the inner circumferential surface 67a can be made smaller than the inclination angle of the second inclined surface 68c with respect to the inner circumferential surface 67a. In this case, the frictional force generated between the projection 68 and the outer circumferential surface 23 when the outer member 20 is pressed into the first seal device 61 can be reduced, thereby more reliably suppressing the inward rotation of the projection 68 toward the radially inward side of the first deflector portion 67X. In this case, the press-fitting of the outer member 20 into the first sealing device 61 becomes smoother.

[0056] The embodiments described above are illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims rather than by the embodiments, and includes all modifications within the scope of equivalence to the configurations described in the claims. [Explanation of symbols]

[0057] 10 Rolling bearing device for wheels 20 Outer member 30 Inner member 40 Rolling element 61 First sealing device (sealing device) 61X first part 61Y 2nd part 61Z third part 63 Metal ring 64 Seal part 67 Deflector section 67X First deflector section 67Y Second Deflector Section 67Z connection 67a Inner surface 68 Protrusion 68a Tip 68b First slope 68c Second slope 69 Guide section 69a Inner surface r1 (radius of the inner surface of the guide section) r2 (radius of the inner circumferential surface of the second portion on the axial side of the projection) w1 (width of the first inclined surface) w2 (width of the second inclined surface)

Claims

1. A rolling bearing device for a wheel comprising an outer member, an inner member, rolling elements disposed between the outer member and the inner member, and a sealing device assembled to the outer member, comprising a resin sealing portion and a metal ring supporting the sealing portion, The sealing device is The outer member has a first cylindrical portion that extends axially and is located radially inward of the outer member, a second cylindrical portion that extends axially and is located radially outward of the outer member, and a third annular portion that extends radially of the outer member, contacts the axial end of the outer member, and connects the first portion and the second portion. The metal ring supports the sealing portion in the first portion and the third portion, The sealing portion has a deflector portion that includes a first deflector portion constituting the second portion and a second deflector portion constituting the third portion. The first deflector section is, Extending in one axial direction from the connection point with the second deflector, A rolling bearing device for a wheel, comprising a projection extending radially inward from the inner circumferential surface of the first deflector portion, and a guide portion extending axially in one direction from the projection.

2. The rolling bearing device for a wheel according to claim 1, wherein the radius of the inner surface of the guide portion is approximately equal to the radius of the inner surface of the first deflector portion on the other axial side of the projection portion.

3. The projection has a tip formed at the radially inward end, a first inclined surface extending from the tip toward the guide portion, and a second inclined surface extending from the tip toward the first deflector portion on the other axial side of the projection. The rolling bearing device for a wheel according to claim 1 or claim 2, wherein the width of the first inclined surface in the axial direction is greater than the width of the second inclined surface in the axial direction.

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