EP-4357631-B1 - BEARING DEVICE FOR VEHICLE WHEEL

Inventors

• MIZUSHIMA Shouta

Dates

Publication Date

20260506

Application Date

20220607

Claims (5)

1. A bearing device for a vehicle wheel comprising: an outer member (2) having double row outer raceway grooves (2c,2d) on an inner periphery; an inner member including a hub ring (3) having a hub flange (3b) extending radially outward at an axial one end portion and having a small diameter step portion (3a) extending axially on an outer periphery, and at least one inner ring (4) press-fitted into the small diameter step portion (3a) of the hub ring (3), the inner member having double row inner raceway grooves (3c,4a) facing the double row outer raceway grooves (2c,2d); double row rolling elements (5,6) rollably accommodated between both raceway grooves (2c,2d,3c,4a) of the outer member (2) and the inner member; and a sealing device (10) closing an opening end on an axial one end side of an annular space formed by the outer member (2) and the inner member, wherein the hub ring (3) includes the inner raceway groove (3c), a seal land portion (3d) positioned at a base end portion of the hub flange (3b), a recess portion (3m) positioned on an outer diameter side of the seal land portion (3d) in the hub flange (3b), and a flange face (3k) positioned on an outer diameter side of the recess portion (3m) in the hub flange(3b), the seal land portion (3d) being in sliding contact with the sealing device (10), the sealing device (10) includes a core metal (11) fitted to an axial one end portion of the outer member (2), and a seal member (12) integrally joined to the core metal (11), the seal member (12) includes a contact lip (12d) extending from the core metal (11) toward the hub flange (3b) side and coming into contact with the seal land portion (3d), and a labyrinth lip (12e) extending from the core metal (11) toward the hub flange (3b) side on an outer diameter side relative to the contact lip (12d) and axially facing the recess portion (3m) across a gap, and the recess portion (3m) includes a bottom portion (313) positioned between an outer diameter side edge portion (311) and an inner diameter side edge portion (312) of the recess portion (3m), the bottom portion (313) having the largest depth of the recess portion (3m), and a tapered face (314) radially extending from the outer diameter side edge portion (311) toward the bottom portion (313) side and inclined toward an axial one end side from the outer diameter side edge portion (311) toward the bottom portion (313), the inner raceway groove (3c) and the seal land portion (3d) include a ground face, and the inner diameter side edge portion (312) of the recess portion (3m) in the hub flange (3b) protrudes on the sealing device (10) side relative to the outer diameter side edge portion (311) in an axial direction, characterized in that the hub ring (3) includes a heat treatment portion (31) quenched within a range in which at least the inner raceway groove (3c), the seal land portion (3d), and the recess portion (3m) are formed, and an outer peripheral edge on an outer diameter side in the heat treatment portion (31) is positioned on an outer diameter side relative to the bottom portion (313) of the recess portion (3m).
2. The bearing device for a vehicle wheel according to claim 1, wherein the flange face (3k) and the recess portion (3m) include a turning face.
3. The bearing device for a vehicle wheel according to claim 1 or 2, wherein an inclination angle to an axial one end side with respect to a radial direction of the tapered face (314) is equal to or less than 26.5°.
4. The bearing device for a vehicle wheel according to any one of claims 1 to 3, wherein the inner diameter side edge portion of the recess portion (3m) of the hub flange (3b) is positioned on an outer diameter side relative to a contact portion with respect to the hub flange (3b) of the contact lip (12d) of the seal member (12).
5. The bearing device for a vehicle wheel according to any one of claims 1 to 4, wherein the seal member (12) includes one or two or more of the contact lips (12d).

Description

TECHNICAL FIELD The present invention relates to a bearing device for vehicle wheel. BACKGROUND ART Conventionally, a bearing device for vehicle wheel rotatably supporting a vehicle wheel in a suspension device of an automobile or the like is known. The bearing device for vehicle wheel is provided with a sealing device that closes an opening end of an annular space formed by an outer member and an inner member to prevent entry of foreign matters such as muddy water. For example, in the bearing device for vehicle wheel described in Patent Literature 1, a hub ring, which is an inner member, has a hub flange extending radially outward, a sliding face on which a main lip of a sealing device is in sliding contact is formed at a base end portion of the hub flange, and a recess portion is formed on an outer diameter side relative to the sliding face of the hub flange. A side lip of the sealing device contactlessly faces the recess portion of the hub flange, and a labyrinth seal is formed by the recess portion and the side lip, thereby improving mud water resistance of the sealing device. In this case, a flange face and the recess portion positioned on the outer diameter side relative to the recess portion in the hub flange are formed by turning, and the sliding face is formed by grinding. A bearing device for a wheel according to the preamble of independent claim 1 is known from JP 2010 180896 A. Further examples are disclosed in JP 2013 072553 A and US 2019/113080 A1. CITATIONS LIST PATENT LITERATURE Patent Literature 1: JP-A 2013-61048 Gazette SUMMARY OF INVENTION TECHNICAL PROBLEMS However, since the recess portion has a U-shape and an outer diameter side edge portion of the recess portion is formed on a face perpendicular to the radial direction, when the hub flange is ground from the outer diameter side toward the inner diameter side, a turning tool for turning the flange face is less likely to enter an outer peripheral side portion of the recess portion from the outer diameter side. Therefore, when turning the hub flange, it is necessary to, after turning the flange face on the outer diameter side relative to the recess portion, perform turning of the recess portion with a turning tool replaced with a tool suitable for turning the outer peripheral side edge portion of the recess portion, and the grinding work of the hub ring is complicated. The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a bearing device for vehicle wheel that, when performing turning on a hub flange, can continuously perform turning on a recess portion without replacing a turning tool after performing turning on an outer diameter side relative to the recess portion, and can simplify grinding work on a hub ring. SOLUTIONS TO PROBLEMS The present invention is defined in independent claim 1. Preferred embodiments are laid down in the dependent claims. ADVANTAGEOUS EFFECTS OF INVENTION According to the present invention, grinding work of a hub ring can be simplified. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a side cross-sectional view illustrating a bearing device for vehicle wheel.FIG. 2 is a side cross-sectional view illustrating a base end portion of a vehicle wheel mounting flange in an outer side seal member and a hub ring.FIG. 3 is a partial cross-sectional view of the hub ring as viewed from the inner side axially.FIG. 4 is a side cross-sectional view illustrating an inclination angle of a tapered face in a recess portion of the vehicle wheel mounting flange.FIG. 5 is a side cross-sectional view illustrating a situation in which an inner diameter side edge portion protrudes on an inner side relative to an outer diameter side edge portion in the recess portion of the vehicle wheel mounting flange.FIG. 6 is a side cross-sectional view illustrating a situation in which an outer peripheral edge on an outer diameter side in a heat treatment portion is positioned on an outer diameter side relative to a bottom portion in the recess portion of the vehicle wheel mounting flange. DESCRIPTION OF EMBODIMENT Hereinafter, an embodiment for carrying out the present invention will be described with reference to the accompanying drawings. [Bearing device for vehicle wheel] A bearing device for a vehicle wheel 1 illustrated in FIG. 1 is an embodiment of a bearing device for vehicle wheel according to the present invention, and rotatably supports a vehicle wheel in a suspension device of a vehicle such as an automobile. The bearing device for a vehicle wheel 1 has a configuration called a third generation, and includes an outer ring 2, which is an outer member, a hub ring 3 and an inner ring 4, which are inner members, two rows of an inner side ball rows 5 and an outer side ball row 6, which are rolling rows, and an inner side seal member 9 and an outer side seal member 10. Here, the inner side represents the vehicle body side of the bearing device for a vehicle wheel 1 when mou