JP2017145898A - Hub unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hub unit which secures the roundness of an outside raceway surface while raising the stiffness of an outer member, and can suppress the damage of a forging metal mold for forming the outer member.SOLUTION: A hub unit 1 comprises: an outer member 2 having a cylinder part 21 in which outside raceway surfaces 2a and 2b are formed at an internal peripheral face, and an attachment flange part 22 which protrudes to the outside from the cylinder part 21, and is attached to a knuckle 91; an inner member 3 in which inside raceway surfaces 3a and 3b are formed at an external peripheral face, and to which wheels 92 are attached; a plurality of rolling bodies 4 which are arranged between the outside raceway surfaces 2a and 2b and the inside raceway surfaces 3a and 3b; and a seal member 5 having an annular deflector part 50 which is fit to an external peripheral face of a vehicle outer-side end part at the cylinder part 21. In the cylinder part 21 of the outer member 2, a padding part 211 which hangs out to the outside rather than a fitting face 21 to which the seal member 5 is fit is formed over the whole periphery within a vehicle outer-side prescribed range from an end face 22a at a side opposite to the knuckle 91 at the attachment flange part 22.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle hub unit that rotatably supports a wheel with respect to a vehicle body.

  Conventionally, as shown in Patent Document 1, for example, a hub unit that rotatably supports a wheel with respect to a vehicle body includes a cylindrical outer member that is attached to a support member on the vehicle body side and an inner member to which the wheel is attached. And a plurality of rolling elements disposed between the outer member and the inner member. An outer raceway surface on which the plurality of rolling elements roll is formed on the inner peripheral surface of the outer member, and an inner raceway surface on which the plurality of rolling elements roll is formed on the outer peripheral surface of the inner member. . The rolling elements roll on the outer raceway surface of the outer member and the inner raceway surface of the inner member.

  The outer member integrally has a cylindrical tube portion having an outer raceway surface formed on the inner surface and a flange portion protruding outward from the tube portion. A plurality of bolt insertion holes are formed in the flange portion. The outer member is fastened to a knuckle as a support member connected to the suspension device of the vehicle by a bolt inserted through the bolt insertion hole of the flange portion.

  Further, the hub unit described in Patent Literature 1 is provided with a plurality of ribs extending from the flange portion toward the wheel side in order to increase the rigidity of the outer member. In the illustrated example of Patent Document 1, four bolt insertion holes are formed in the flange portion, and each rib is provided so as to extend from the position between the two bolt insertion holes arranged in the circumferential direction to the wheel side. The plurality of ribs suppress deformation of the outer member, improve steering stability, and suppress adverse effects on the rotational accuracy of the rolling elements.

JP 2011-94728 A

  When the outer member described in Patent Document 1 is formed by forging, a plurality of concave grooves having a shape corresponding to a plurality of ribs are required for a die (forging die) used for forging. In the corner portion on the opening side of the concave groove, the material flow pressure acts at the time of forging, so that damage is likely to occur. For this reason, by providing a plurality of ribs on the outer member, the life of the forging die for forming the outer member may be shortened.

  Further, in the outer member described in Patent Document 1, the radial thickness of the cylindrical portion is greatly different between a portion where the rib is provided and a portion where the rib is not provided. For this reason, distortion occurs when the outer member is subjected to heat treatment such as induction hardening of the outer raceway surface, and this distortion may adversely affect the roundness of the outer raceway surface.

  The present invention has been made in view of the above circumstances, and while maintaining the rigidity of the outer member, the roundness of the outer raceway surface is secured and the forging die for molding the outer member is damaged. It is an object of the present invention to provide a hub unit capable of suppressing the above.

  In order to achieve the above-mentioned object, the present invention has an outer portion having a cylindrical portion having an outer raceway surface formed on the inner periphery and a mounting flange portion that protrudes outward from the cylindrical portion and is attached to a support member on the vehicle inner side. A direction member, an inner member having an inner raceway surface formed on an outer periphery thereof, to which a vehicle outer side wheel is attached, a plurality of rolling elements disposed between the outer raceway surface and the inner raceway surface, and the cylinder And a sealing member having an annular deflector portion that is fitted and fixed to the outer peripheral surface of the vehicle outer side end portion of the outer member, and the cylindrical member of the outer member has the support member in the mounting flange portion Provided is a hub unit in which a built-up portion extending outward from a fitting surface to which the seal member is fitted is formed over a whole circumference in a predetermined range on the vehicle outer side from a surface opposite to the mounting surface of .

  According to the hub unit of the present invention, it is possible to secure the roundness of the outer raceway surface while suppressing the rigidity of the outer member, and to suppress damage to the forging die for forming the outer member. It becomes.

It is sectional drawing which shows the whole structure of the hub unit which concerns on embodiment of this invention. (A) is a perspective view which shows the outward member of a hub unit. (B) is the side view which looked at the outward member from the vehicle outer side. It is sectional drawing which shows an outward member alone. It is sectional drawing of the sealing member which expands and shows a part of FIG. (A) is sectional drawing which shows the outward member which concerns on a 1st modification, (b) is sectional drawing which shows the outward member which concerns on a 2nd modification. (A) is sectional drawing which shows the sealing member which concerns on a 1st modification, (b) is sectional drawing which shows the sealing member which concerns on a 2nd modification.

[Embodiment]
A hub unit according to an embodiment of the present invention will be specifically described with reference to FIGS.

(Overall configuration of hub unit)
FIG. 1 is a cross-sectional view showing the overall configuration of a hub unit 1 according to an embodiment of the present invention. In FIG. 1, the hub unit 1 mounted on the vehicle is shown together with its peripheral portion. The hub unit 1 is used to rotatably support a wheel 92 together with a brake rotor 93 with respect to a knuckle 91 serving as a support member connected to a vehicle suspension device. Hereinafter, in the hub unit 1, the side on which the wheel 92 is attached (the left side in FIG. 1) is referred to as the vehicle outer side, and the opposite side (the right side in FIG. 1) is referred to as the vehicle inner side.

  The hub unit 1 includes an outer member 2 attached to the knuckle 91 on the vehicle inner side, an inner member 3 to which a wheel 92 on the vehicle outer side is attached together with the brake rotor 93, and the outer member 2 and the inner member 3. A plurality of rolling elements 4 disposed therebetween, a seal member 5 fixed to an end of the outer member 2 on the vehicle outer side, and a cover member 6 that closes the opening of the outer member 2 on the vehicle inner side. I have. Further, the hub unit 1 has a magnetic ring 7 that rotates integrally with the inner member 3 and a magnetic field sensor 8 that is disposed to face the magnetic ring 7 as members for detecting the rotation speed of the wheel 92. doing. The magnetic field sensor 8 is fixed to the cover member 6.

  The inner member 3 is disposed so as to be rotatable with respect to the outer member 2 around the rotation axis O. On the outer periphery of the inner member 3, a first inner raceway surface 3a for rolling the rolling element 4 and a second inner raceway surface 3b formed on the vehicle inner side with respect to the first inner raceway surface 3a are parallel to each other. Is formed. The first inner raceway surface 3 a faces the first outer raceway surface 2 a of the outer member 2, and the second inner raceway surface 3 b faces the second outer raceway surface 2 b of the outer member 2.

  In the present embodiment, the inner member 3 includes a hub wheel 31 and an annular inner ring member 32. The hub wheel 31 includes a wheel attachment flange portion 311 to which the wheel 92 is attached, a body portion 313 disposed inside the outer member 2, and a connecting portion 312 that connects the wheel attachment flange portion 311 and the body portion 313. It has one. The wheel mounting flange portion 311 is formed with a plurality of press-fitting holes 310 into which serrated bolts 33 for wheel mounting are press-fitted.

  In the bolt 33 with serration, the shaft portion 331 is press-fitted into the press-fitting hole 310, and the head portion 332 is in contact with the end surface of the wheel mounting flange portion 311 on the vehicle inner side. The shaft portion 331 of the bolt with serration 33 is inserted into an insertion hole 920 formed in the wheel of the wheel 92 and an insertion hole 930 formed in the brake rotor 93. A wheel nut 94 is screwed into the distal end portion of the shaft portion 331.

  The body portion 313 includes a large diameter portion 314 on the wheel attachment flange portion 311 side and a small diameter portion 315 on the opposite side to the wheel attachment flange portion 311 side. A first inner raceway surface 3 a is formed on the outer peripheral surface of the large diameter portion 314. An inner ring member 32 is fitted on the outer peripheral surface of the small diameter portion 315. The inner ring member 32 is fixed to the hub ring 31 by a caulking portion 315a in which a part of the small diameter portion 315 is plastically deformed. A second inner raceway surface 3 b is formed on the outer peripheral surface of the inner ring member 32.

  The plurality of rolling elements 4 disposed between the first outer raceway surface 2 a and the first inner raceway surface 3 a are held by a first holder 43 so as to be able to roll. The plurality of rolling elements 4 arranged between the second outer raceway surface 2b and the second inner raceway surface 3b are held by the second holder 44 so as to be able to roll. Intrusion of foreign matter (water droplets, pebbles, sand dust, etc.) into the space between the inner member 3 where the plurality of rolling elements 4 are arranged and the outer member 2 is suppressed by the seal member 5 and the cover member 6. .

  In addition, in this Embodiment, although the rolling element 4 is a spherical body, it is not restricted to this, A tapered roller may be sufficient. In the present embodiment, the inner member 3 has one inner ring member 32. However, the inner member 3 has two inner ring members, and one of the inner ring members is not limited thereto. The first inner raceway surface 3a may be formed, and the second inner raceway surface 3b may be formed on the other inner ring member.

  The magnetic ring 7 has a metal core 71 fixed to the inner member 3 and an annular magnetic member 72 attached to the metal core 71. The metal core 71 is made of a metal such as stainless steel or iron, and is fitted on the outer peripheral surface of the inner ring member 32. The magnetic member 72 is attached to the core bar 71 by, for example, a vulcanization bonding method. The magnetic member 72 is formed, for example, by mixing a ferritic stainless steel powder in a rubber ring member, and a plurality of magnetic poles (N pole and S pole) having different magnetism are alternately provided along the circumferential direction. Yes.

  The cover member 6 includes a disk portion 61 that faces the magnetic member 72, a cylindrical portion 62 that is fitted inside the outer member 2, and a flange portion 63 that contacts the end surface of the outer member 2 on the vehicle inner side. Have. The cover member 6 is formed by press-molding a nonmagnetic metal such as austenitic stainless steel.

  The magnetic field sensor 8 is held by the disk portion 61 of the cover member 6 and faces a part of the circumferential direction of the magnetic member 72. When the wheel 92 rotates together with the inner member 3, the magnetic poles of the magnetic member 72 detected by the magnetic field sensor 8 alternate.

(Configuration of outer member 2 and seal member 5)
FIG. 2A is a perspective view showing the outer member 2. FIG. 2B is a side view of the outer member 2 viewed from the vehicle outer side. FIG. 3 is a cross-sectional view showing the outer member 2 alone. FIG. 4 is a cross-sectional view of the seal member 5 showing a part of FIG. 1 in an enlarged manner.

  The outer member 2 is made of, for example, S55C (carbon steel for machine structure) and is formed by forging. Further, the outer member 2 integrally includes a cylindrical tube portion 21 and a mounting flange portion 22 that protrudes outward from the tube portion 21 and is attached to the knuckle 91. In the cylinder portion 21, the seal member 5 is fixed to the end portion on the vehicle outer side, and the cover member 6 is fixed to the end portion on the vehicle inner side. A first outer raceway surface 2a and a second outer raceway surface 2b are formed in parallel with each other on the inner periphery of the cylindrical portion 21.

  The mounting flange portion 22 is formed with a bolt insertion hole 220 through which the shaft portion 901 of the bolt 90 screwed into the screw hole 910 provided in the knuckle 91 is inserted. The bolt insertion hole 220 is open to the end surface 22a on the vehicle outer side of the mounting flange portion 22 and the end surface 22b on the vehicle inner side. The end surface 22 b on the vehicle inner side is a mounting surface for the knuckle 91. The head portion 902 of the bolt 90 abuts on the end surface 22a on the vehicle outer side opposite to the end surface 22b on the vehicle inner side.

As for the cylinder part 21, the outer peripheral surface in the edge part by the side of a vehicle outer is formed as the fitting surface 21a with which the sealing member 5 fits. The width | variety of the fitting surface 21a in the axial direction of the cylinder part 21 is 5-20 mm, for example. Further, the cylinder portion 21 is formed with a built-up portion 211 that extends outward from the fitting surface 21a in a predetermined range on the vehicle outer side from the end surface 22a on the vehicle outer side of the mounting flange portion 22 over the entire circumference. Yes. Here, “formed over the entire circumference” means that the built-up portion 211 is provided at any position in the circumferential direction of the cylindrical portion 21 in the predetermined range. In FIG. 3, this predetermined range is indicated by reference numeral R ₁ .

  The fitting surface 21a is parallel to the rotation axis O, and its outer diameter is constant over the entire axial direction. The outer diameter of the built-up portion 211 is the largest at the connection portion with the mounting flange portion 22, and gradually decreases toward the vehicle outer side. In the present embodiment, no step is provided between the fitting surface 21a and the outer peripheral surface 211a of the built-up portion 211, and the outer diameter of the built-up portion 211 is closer to the outer side of the vehicle outer surface. Asymptotic to the diameter.

  In the present embodiment, the inclination angle θ (see FIG. 3) of the outer peripheral surface 211a of the built-up portion 211 with respect to the axial direction parallel to the rotation axis O is constant. That is, the outer peripheral surface 211a of the built-up portion 211 is a tapered surface that decreases in diameter conically toward the vehicle outer side. The inclination angle θ is preferably 5 ° or more in order to ensure the rigidity of the outer member 2. Further, in order to suppress the weight of the outer member 2, the inclination angle θ is desirably 20 ° or less.

The end portion on the vehicle outer side of the built-up portion 211 is located on the vehicle inner side by a predetermined distance from the end surface 21 b on the vehicle outer side of the tubular portion 21. In Figure 3, it illustrates this predetermined range by symbol R _2. Fitting surface 21a is formed in the range of the predetermined distance R _2. It is desirable that the built-up portion 211 is provided up to the vicinity of the fitting surface 21a. The build-up portion 221 needs to extend to the vehicle outer side at least from the intermediate position between the deepest portion 20a of the first outer raceway surface 2a and the deepest portion 20b of the second outer raceway surface 2b. In the present embodiment, the built-up portion 211 is formed in a range reaching the vehicle outer side from the deepest portion 20a of the first outer raceway surface 2a. In other words, the axial position of the vehicle outer side end of the built-up portion 211 is closer to the vehicle outer side than the axial position of the deepest portion 20a of the first outer raceway surface 2a. Thereby, the rigidity with respect to the load which the outer member 2 receives from the rolling element 4 which rolls the 1st outer raceway surface 2a becomes high.

  The seal member 5 includes a cored bar 51 formed by pressing from a stainless steel plate, for example, and a seal rubber 52 fixed to the cored bar 51. The metal core 51 includes a cylindrical portion 511 that is fitted to the fitting surface 21a of the cylindrical portion 21 of the outer member 2, and an extending portion 512 that extends inward from an end portion of the cylindrical portion 511 on the vehicle outer side. Is integrated. The seal member 5 is fixed to the outer member 2 by fitting the cylindrical portion 511 of the metal core 51 to the fitting surface 21a. The cored bar 51 is pushed into the cylindrical portion 21 of the outer member 2 until the extending portion 512 comes into contact with the end surface 21b on the vehicle outer side of the cylindrical portion 21 of the outer member 2.

  The seal rubber 52 is joined to the core metal 51 by, for example, vulcanization adhesion. The seal rubber 52 is provided with first to third seal lip portions 521 to 523 that are in sliding contact with the outer peripheral surface 31 a of the hub ring 31 of the inner member 3.

  A part of the outer peripheral side of the seal member 5 fitted to the fitting surface 21 a is formed as an annular deflector portion 50. The deflector portion 50 suppresses intrusion of foreign matter from the gap between the end surface 21 b on the vehicle outer side in the tubular portion 21 and the outer peripheral surface 31 a of the hub wheel 31. In the present embodiment, the deflector portion 50 is configured by the cylindrical portion 511 of the core metal 51 and a part of the seal rubber 52. The deflector portion 50 functions as a “slope plate” that deflects the traveling direction of foreign matter toward the gap between the end surface 21 b of the cylinder portion 21 on the vehicle outer side and the outer peripheral surface 31 a of the hub wheel 31.

  The seal rubber 52 in the deflector portion 50 includes a base portion 524 on the outer peripheral side of the cylindrical portion 511 of the core metal 51, a flange portion 525 that extends in the axial direction from the base portion 524 toward the vehicle outer side, and a vehicle from the base portion 524. It consists of a protruding portion 526 provided to protrude toward the inner side. The protruding portion 526 functions as a deflector lip, and an inner peripheral surface 526 a thereof is in contact with the outer peripheral surface of the cylindrical portion 21 of the outer member 2 on the vehicle inner side with respect to the cylindrical portion 511 of the core metal 51. Thereby, even if there is a slight gap between the cylindrical portion 511 and the fitting surface 21a in a part of the circumferential direction of the cored bar 51, moisture and the like are prevented from entering the gap.

  In the present embodiment, an interposition surface 21c having the same diameter as the fitting surface 21a is formed between the fitting surface 21a and the outer peripheral surface 211a of the built-up portion 211. The intervening surface 21 c is an annular surface extending in the circumferential direction of the cylindrical portion 21 in the outer member 2. The built-up portion 211 is formed on the vehicle inner side with respect to the interposed surface 21c. The inner peripheral surface 526a of the projecting portion 526 is in elastic contact with the interposed surface 21c. However, the outer member 2 may be configured such that the inner peripheral surface 526a of the projecting portion 526 is elastically in contact with the outer peripheral surface 211a of the built-up portion 211.

(Effect of embodiment)
According to the embodiment described above, the outer member 2 protrudes outward from the fitting surface 21a into which the seal member 5 is fitted to the cylindrical portion 21 in a predetermined range on the vehicle outer side from the mounting flange portion 22 of the outer member 2. The following effects are obtained by forming the built-up portion 211 over the entire circumference.

(Rigidity improvement effect)
The outer member 2 receives a load directed outward from the rolling elements 4 that roll on the first outer raceway surface 2a and the second outer raceway surface 2b. When the rigidity of the cylindrical portion 21 is low, deformation occurs due to this load, and the smooth rolling of the rolling element 4 is hindered. However, in this embodiment, the cylindrical portion 21 is reinforced by the built-up portion 211 to ensure rigidity. Has been. Further, since the outer diameter of the built-up portion 211 becomes smaller toward the vehicle outer side, rigidity is ensured while suppressing the weight of the outer member 2.

(Durability improvement effect of mold)
For example, when a plurality of ribs are provided on the outer member as in the conventional hub unit cited as the background art, it is necessary to form a plurality of concave grooves having a shape corresponding to the ribs in the forging die. In this case, the material flow pressure acts locally and acts on the corners on the opening side of the concave groove, so that the mold life is shortened. However, in the outer member 2 according to the present embodiment, the concentration of the material flow pressure is reduced. Can prevent damage to the mold. That is, in the outer member 2 according to the present embodiment, the build-up portion 211 is formed over the entire circumference of the cylindrical portion 21, so that the material flow pressure is locally applied to a part of the mold that forms the cylindrical portion 21. There is no concentration. For this reason, damage to the mold is suppressed, durability is improved, the life of the mold can be extended, and the manufacturing cost of the outer member 2 can be reduced.

(Distortion suppression effect)
In the outer member 2 according to the present embodiment, the radial thickness of the cylindrical portion 21 in the cross section orthogonal to the rotation axis O at any position in the axial direction is equal at any position in the circumferential direction. For this reason, it can suppress that the roundness of the 1st outer raceway surface 2a and the 2nd outer raceway surface 2b deteriorates by the distortion at the time of heat-processing to the 1st outer raceway surface 2a and the 2nd outer raceway surface 2b. . In other words, when a plurality of ribs are provided on the outer member as in the conventional hub unit mentioned as the background art, for example, a portion having a large radial thickness (portion where the rib is provided) and a portion having a thin rib (rib) There is a difference in the amount of shrinkage at the time of heat treatment. Then, due to the difference in the amount of contraction, the roundness of the raceway surface is deteriorated, and smooth rolling of the rolling element is hindered in a portion where the amount of contraction is large, and rattling may occur in a portion where the amount of contraction is small. However, in the outer member 2 according to the present embodiment, since the radial thickness of the cylindrical portion 21 is uniform in the circumferential direction, it is possible to prevent such a problem from occurring.

(Drainage improvement effect)
For example, when a plurality of ribs are provided on the outer member as in the conventional hub unit mentioned as the background art, the side surface of the rib located above the rotation axis of the inner member (in the circumferential direction of the outer member) Water accumulates on the edge. And there exists a possibility that rust may generate | occur | produce on the outer peripheral surface of an outer member with this water. On the other hand, according to the outer member 2 according to the present embodiment, there is no concave portion on the outer peripheral surface of the cylindrical portion 21 where water can accumulate. That is, since the drainage property of the water adhering to the outer member 2 is improved, the generation of rust is suppressed.

(Effect of improving seal member mounting)
Since the fitting surface 21a to which the seal member 5 is fitted is formed in an annular shape with a constant outer diameter, for example, the end portion of the outer member on the vehicle outer side as in the conventional hub unit mentioned as the background art. Compared to the case where a plurality of ribs extend, the seal member 5 can be reliably fixed. Further, since the seal member 5 has the deflector portion 50, entry of foreign matters from the gap between the end surface 21 b on the vehicle outer side in the cylindrical portion 21 and the outer peripheral surface 31 a of the hub wheel 31 is suppressed.

[Modification of outer member]
Next, a modified example of the outer member 2 will be described with reference to FIG. FIG. 5A is a cross-sectional view showing the outer member 2A according to the first modification, and FIG. 5B is a cross-sectional view showing the outer member 2B according to the second modification.

  In the above embodiment, the case where the inclination angle θ of the outer peripheral surface 211a of the built-up portion 211 of the outer member 2 is constant has been described. However, in the outer member 2A according to the first modification, the built-up portion 211 is formed. The inclination angle of the outer peripheral surface 211a changes in a plurality of stages. Further, in the outer member 2B according to the second modification, the inclination angle of the outer peripheral surface 211a of the built-up portion 211 continuously changes in a stepless manner. In the outer members 2A and 2B, the built-up portion 211 is formed over the entire circumference. 5A and 5B, portions corresponding to those described in the above embodiment are given the same reference numerals as those used in FIG. 3, and redundant description is omitted.

In the outer member 2A according to the first modified example, the inclination angle of the outer peripheral surface 211a of the built-up portion 211 changes in two stages with the boundary portion 211b as a boundary. Specifically, the inclination angle theta ₁ of the outer peripheral surface 211a of the deposition unit 211 in the vehicle inner side than the boundary portion 211b is, the inclination angle of the outer peripheral surface 211a of the deposition unit 211 in the vehicle outer side of the boundary portion 211b theta Greater than ₂ .

  In the outer member 2B according to the second modified example, the cross-sectional shape of the outer peripheral surface 211a of the built-up portion 211 is a part of an imaginary circle centered on the outer side of the end portion on the vehicle outer side of the built-up portion 211. It is formed in a certain arc shape.

  The effects similar to those of the first embodiment can be obtained by the outer members 2A and 2B according to these modified examples. In the outer member 2A according to the first modified example, the case where the inclination angle of the outer peripheral surface 211a of the built-up portion 211 is changed in two stages has been described, but the inclination angle is changed in three stages or four or more stages. It may be. Moreover, the cross-sectional shape of the outer peripheral surface 211a of the build-up portion 211 may be, for example, an elliptical arc shape that is a part of an ellipse having a major axis parallel to the axial direction of the outer member.

[Modification of seal member]
Next, a modified example of the seal member 5 will be described with reference to FIG. In the embodiment described with reference to FIG. 4, the case where the metal core 51 and the seal rubber 52 are externally fitted to the end portion of the cylindrical portion 21 on the vehicle outer side has been described. The seal members 5A and 5B according to the modifications described below have a cored bar 51 and a seal rubber 52 as in the seal member 5 described with reference to FIG. 4, but the shapes thereof are different. 6 (a) and 6 (b), portions corresponding to those described in the above embodiment are given the same reference numerals as those used in FIG. 4, and redundant descriptions are omitted.

  FIG. 6A is a cross-sectional view showing a seal member 5A according to a first modification. The metal core 51 of the seal member 5A extends radially outward from the cylindrical portion 513 fitted to the inner peripheral surface of the end portion of the cylindrical portion 21 on the vehicle outer side and the end portion of the cylindrical portion 513 on the vehicle outer side. The outer ring portion 514 and the inner ring portion 515 extending inward in the radial direction from the end portion on the vehicle inner side in the cylindrical portion 513 are integrally provided. The outer annular portion 514 is in contact with the end surface 21 b on the vehicle outer side of the cylindrical portion 21 of the outer member 2.

  The seal rubber 52 around the inner ring portion 515 is provided with first to third seal lip portions 521 to 523 that are in sliding contact with the outer peripheral surface 31 a of the hub wheel 31. The seal rubber 52 is fitted in a fitting surface 21a that is an outer peripheral surface of the end portion of the cylinder portion 21 on the vehicle outer side, and extends in the axial direction from the cylinder portion 527 toward the vehicle outer side. And a flange portion 525. The cylindrical portion 527 and the flange portion 525 constitute the deflector portion 50.

  FIG. 6B is a cross-sectional view showing a seal member 5B according to a second modification. The metal core 51 of the seal member 5B includes a cylindrical portion 516 fitted to a fitting surface 21a that is an outer peripheral surface of the end portion of the cylindrical portion 21 on the vehicle outer side, and an axial direction from the cylindrical portion 516 toward the vehicle outer side. A folded portion 517 that extends and is folded back toward the vehicle inner side and an extending portion 518 that extends radially inward from the folded portion 517 are integrally provided. The seal rubber 52 is provided with first to third seal lip portions 521 to 523 that are in sliding contact with the outer peripheral surface 31 a of the hub ring 31 of the inner member 3.

  The seal member 5B is fixed to the outer member 2 by fitting the cylindrical portion 516 of the metal core 51 to the fitting surface 21a. The core metal 51 is pushed into the cylindrical portion 21 of the outer member 2 until the extending portion 518 comes into contact with the end surface 21b on the vehicle outer side of the cylindrical portion 21 of the outer member 2. The cylindrical portion 516 and the folded portion 517 of the core metal 51 constitute the deflector portion 50.

  Effects similar to those of the embodiment can also be obtained by the seal members 5A and 5B according to these modified examples. Further, it is possible to appropriately combine the seal member 5A or the seal member 5B with the outer member 2A or the outer member 2B described with reference to FIG.

(Appendix)
As mentioned above, although this invention was demonstrated based on embodiment and a modification, embodiment described above does not limit the invention which concerns on a claim. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

  Further, the present invention can be appropriately modified and implemented without departing from the spirit of the present invention. For example, in the above embodiment, the case where the hub unit 1 is configured for a driven wheel has been described. However, the present invention can also be applied to a hub unit for a driving wheel. In this case, the hub wheel 31 is formed with a fitting hole into which a shaft portion of a constant velocity joint provided on the drive shaft is fitted so as not to be relatively rotatable.

DESCRIPTION OF SYMBOLS 1 ... Hub unit 2, 2A, 2B ... Outer member 21 ... Cylindrical part 211 ... Overlaying part 21a ... Fitting surface 22 ... Mounting flange part 22a ... End surface on the vehicle outer side 22b ... End surface 221 on the vehicle inner side ... Overlaying Part 2a: first outer raceway surface 2b ... second outer raceway surface 3 ... inner member 3a ... first inner raceway surface 3b ... second inner raceway surface 4 ... rolling element 5 ... seal member 50 ... deflector part 51 ... cored bar 511 ... Cylindrical part 52 ... Seal rubber 91 ... Knuckle (support member) 92 ... Wheel

Claims (3)

An outer member having a cylindrical portion having an outer raceway surface formed on the inner periphery, and an attachment flange portion that protrudes outward from the cylindrical portion and is attached to a support member on the vehicle inner side;
An inner member on which an inner raceway surface is formed on the outer periphery and wheels on the vehicle outer side are attached;
A plurality of rolling elements disposed between the outer raceway surface and the inner raceway surface;
A sealing member having an annular deflector portion fitted to the outer peripheral surface of the end portion on the vehicle outer side in the cylindrical portion;
The cylindrical portion of the outer member has an outer side than a fitting surface on which the seal member is fitted within a predetermined range on the vehicle outer side from a surface opposite to the mounting surface of the support member in the mounting flange portion. A built-up part overhanging the entire circumference was formed,
Hub unit. The seal member has a cored bar and a seal rubber fixed to the cored bar to constitute the deflector part, and the seal rubber is in contact with the outer peripheral surface of the cylindrical part.
The hub unit according to claim 1. In the sealing member, the cylindrical portion of the core metal is fitted to the fitting surface, and the seal rubber is in contact with the outer peripheral surface of the cylindrical portion on the vehicle inner side than the cylindrical portion of the core metal.
The hub unit according to claim 2.

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