JP2007162831A - Hub unit for driven wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hub unit for a driven wheel protecting an encoder and a speed sensor, and capable of sharing components with a hub unit for a driving wheel. <P>SOLUTION: The hub unit 1 for a driven wheel is provided with a hub 10 for attaching a wheel, an inner ring 20 fixed with respect to the hub 10 and formed with a raceway surface on an outer circumferential part, an outer ring 30 fixed to a housing 40 supported by a suspension device and formed with a raceway surface on an inner circumferential face, and rolling elements B arranged between the raceway surfaces of the inner ring 20 and the outer ring 30. It is composed by providing the encoder E fixed with respect to the inner ring 20, and arranged facing a vehicle width direction inner side, and an annular baffle part 72 fixed with respect to the inner ring 20, facing the encoder E with a space for housing a detection part 81 of the speed sensor 80 in between, and with an outer circumference rim part arranged adjacent to an inner circumferential face of the housing 40. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hub unit used for a driven wheel of a vehicle such as an automobile.

The hub unit rotatably supports a hub on which a wheel is mounted with respect to a housing supported by a suspension, and usually includes a unit bearing combined with a double row rolling bearing.
In addition, a hub unit that incorporates a vehicle speed sensor used for control of ABS or the like is known. As such a vehicle speed sensor, an active sensor using a magnetic encoder seal magnetized in multiple poles is known. The magnetic encoder seal is fixed to the inner ring side of the hub while facing the inner side in the vehicle width direction, and the speed sensor for detecting the magnetism of the magnetic encoder seal is in a state where the detection portion faces the magnetic encoder seal. It is inserted from the outer diameter side of the hub unit.

It has been proposed that the hub unit having the speed sensor described above is provided with a labyrinth in order to prevent muddy water, pebbles, and the like from entering the magnetic encoder seal side from the opening in the vehicle width direction of the housing. Such a labyrinth is formed between the inner diameter side of the housing and the outer diameter side of the drive shaft in the hub unit for the drive wheel into which the drive shaft is inserted (see, for example, Patent Document 1).
JP 2002-316508 A

However, since the hub unit for the driven wheel (non-driving wheel) is not provided with the drive shaft, the labyrinth having the above-described configuration cannot be provided.
On the other hand, the driven wheel hub unit may prevent foreign matter from entering by means other than the labyrinth, such as closing the opening of the housing with a sheet metal or resin dust cover. , Component parts such as vehicle speed sensors, outer rings, oil seals, dust covers, etc. need to be specially designed differently from those for drive wheels, which increases development man-hours and development costs, and increases the number of types and specifications of parts. Product costs also increase.
In view of the above-described problems, an object of the present invention is to provide a driven-wheel hub unit that protects the encoder and the vehicle speed sensor and can share components with the drive-wheel hub unit.

The present invention solves the above-described problems by the following means.
According to the first aspect of the present invention, a hub to which a wheel is mounted, an inner ring fixed to the hub and having a raceway surface formed on the outer peripheral surface portion, and a housing supported by the suspension device are fixed to the inner peripheral surface portion. An outer ring having a raceway surface, a rolling element disposed between the raceway surface of the inner ring and the raceway surface of the outer ring, and an encoder that is fixed to the inner ring and that faces the inner side in the vehicle width direction. Fixed to the inner ring, opposed to the encoder with an interval in which a detection portion of a vehicle speed sensor is accommodated, and an outer peripheral edge portion disposed adjacent to the inner peripheral surface of the outer ring or the housing. A driven wheel hub unit including an annular baffle portion.

According to a second aspect of the present invention, in the driven wheel hub unit according to the first aspect, the encoder is a magnetic encoder seal fixed to an oil seal slinger provided between the inner ring and the outer ring. This is a hub unit for a driven wheel.
According to a third aspect of the present invention, in the driven wheel hub unit according to the first or second aspect, the rolling elements are arranged in multiple rows spaced apart in the axle direction of the wheel, and at least one row of the rolling elements is The driven wheel hub unit is disposed between a raceway surface of the outer ring and a raceway surface formed integrally with an outer peripheral surface of the hub.
According to a fourth aspect of the present invention, in the driven wheel hub unit according to the third aspect, the inner ring is fixed to the hub by swinging and tightening an end of the hub in the vehicle width direction. This is a hub unit for a driven wheel.
According to a fifth aspect of the present invention, in the driven wheel hub unit according to any one of the first to fourth aspects, the baffle portion is integrated with a cylindrical portion into which an outer peripheral surface portion of the inner ring is inserted. It is a hub unit for driven wheels characterized by being formed.
According to a sixth aspect of the present invention, in the driven wheel hub unit according to any one of the first to fourth aspects, the baffle portion is integrated with a cylindrical portion inserted on the inner diameter side of the hub. It is a hub unit for driven wheels characterized by being formed.
A seventh aspect of the present invention is the driven wheel hub unit according to any one of the first to fourth aspects, wherein the baffle portion is an oil seal slinger provided between the inner ring and the outer ring. Is a hub unit for a driven wheel.

According to the present invention, the labyrinth is provided between the baffle portion and the outer ring or the housing by providing the annular baffle portion that is fixed to the inner ring side and the outer peripheral edge portion is disposed adjacent to the inner peripheral surface of the outer ring or the housing. And muddy water and pebbles can be prevented from entering the encoder and the vehicle speed sensor.
In addition, by forming the baffle portion in a shape substantially equivalent to the labyrinth forming portion on the outer peripheral surface of the drive shaft inserted into the hub unit of the drive wheel, the components such as the outer ring and the housing can be combined with the hub unit for the drive wheel. Can be shared.

  An object of the present invention is to provide a driven wheel hub unit that protects an encoder and a vehicle speed sensor and can share parts with a drive wheel hub unit. This is solved by fixing the shaped baffle plate to the inner ring side and inserting the detection part of the vehicle speed sensor from the outer diameter side of the hub unit into the space between the encoder seal and the baffle plate.

FIG. 1 is a cross-sectional view of a driven wheel hub unit according to a first embodiment to which the present invention is applied.
The driven wheel hub unit 1 is used, for example, as a rear wheel of a front-wheel drive passenger car. The hub 10, the inner ring 20, the outer ring 30, the housing 40, the outer oil seal 50, the inner oil seal 60, and the baffle plate 70 are used. A vehicle speed sensor 80 is provided.

A hub (not shown) is fixed to the hub 10 and is a cylindrical member that rotates around the axle as the wheel rotates. A flange 11, a recess 12, a caulking portion 13, and a raceway surface 14 are formed on the hub 10.
The flange 11 projects from the outer peripheral surface at the outer end of the hub 10 in the vehicle width direction and is integrally formed. A hub bolt 15 used for fixing the wheel is inserted into the flange 11 from the inner side in the vehicle width direction.
The recess 12 is formed by recessing the inner end face of the hub 10 in the vehicle width direction, and is formed in a circular shape concentric with the axle as viewed from the axle direction. Here, in this specification, the axle refers to the rotation axis of the hub 10 with respect to the outer ring 30. If the toe angle, the camber angle, and the steering angle are all 0, the direction is the same as the vehicle width direction. .
The caulking portion 13 is a portion obtained by plastically deforming the opening edge of the recess 12 at the inner end in the vehicle width direction of the hub 10 to the outer diameter side by swing caulking, and the inner ring 20 with respect to the hub 10. To fix.
The raceway surface 14 is a steel ball that is formed on the outer peripheral surface portion on the inner side in the vehicle width direction than the flange portion 11 of the hub 10 and is incorporated as a rolling element, and guides the ball B held by a retainer (not shown). .
Here, the hub unit 1 for the driven wheel constitutes a double row angular ball bearing, and the raceway surface 14 of the hub 10 guides the balls B in the row on the outer side in the vehicle width direction.

The inner ring 20 includes a raceway surface 21 that guides the balls B in the row on the inner side in the vehicle width direction, and an end portion on the inner side in the vehicle width direction of the hub 10 is inserted on the inner diameter side thereof. In the region where the inner ring 20 is inserted, the outer peripheral surface portion of the hub 10 is formed to have a stepped outer diameter, so that the raceway surface 14 of the hub 10 and the raceway surface 21 of the inner ring 20 are planes orthogonal to the axle. The region between the raceway surface 14 and the raceway surface 21 is formed as a smooth circumferential surface having a substantially constant outer diameter.
The inner ring 20 is fixed to the hub 10 by pressing the end surface on the inner side in the vehicle width direction by the crimping portion 13 of the hub 10.
Further, the inner ring 20 is formed with a baffle plate mounting portion 22 in which the outer diameter of the outer peripheral surface at the end portion on the inner side in the vehicle width direction is made smaller in a step shape.

The outer ring 30 is a cylindrical member into which the hub 10 and the inner ring 20 are inserted on the inner diameter side thereof, and raceway surfaces 31 and 32 for guiding the outer and inner balls B in the vehicle width direction are formed on the inner peripheral surface portion thereof. The hub 10 and the inner ring 20 are supported so as to be rotatable around the axle.
The outer ring 30 is formed by expanding the inner diameter of both end portions in the axle direction in a step shape, and the outer oil seal 50 and the inner oil seal 60 are disposed in the step portion.

The housing 40 is supported on the vehicle body by a suspension arm (not shown), and is a member to which the outer ring 30 is fixed. An opening 41 into which an end of the outer ring 30 on the inner side in the vehicle width direction is inserted is formed. .
The housing 40 is formed with a through hole 42 in which a vehicle speed sensor is mounted. The through hole 42 is formed so as to penetrate in a substantially vertical direction from the outer surface of the upper portion of the housing 40 to the inner peripheral surface of the opening 41 into which the outer ring 30 is inserted. It can be inserted in the orthogonal direction.

The outer oil seal 50 is disposed between the inner peripheral surface at the outer end of the outer ring 30 in the vehicle width direction and the outer peripheral surface of the hub 10 facing this.
The inner oil seal 60 is disposed between the inner peripheral surface at the inner end in the vehicle width direction of the outer ring 30 and the outer peripheral surface of the inner ring 20 facing this. Here, the baffle plate mounting portion 22 of the inner ring 20 described above is provided on the inner side in the vehicle width direction than the inner oil seal.
The outer oil seal 50 and the inner oil seal 60 prevent leakage of lubricant such as grease enclosed in the bearing to the outside, and entry of foreign matter such as water, dust, pebbles and the like from the outside into the bearing. A rubber lip with a cored bar fixed to the outer ring 30 side and a slinger fixed to the hub 10 or the inner ring 20 side are provided. Here, the slinger of the inner oil seal 60 is formed integrally with the cylindrical portion into which the outer peripheral surface portion of the inner ring 20 is inserted, and the cylindrical portion is formed on the outer diameter side from the inner end in the vehicle width direction. And a flange portion formed so as to protrude into a collar shape.
The slinger of the inner oil seal 60 has an encoder seal E attached to the inner surface of the collar portion in the vehicle width direction. The encoder seal E is a magnetic encoder magnetized in multiple poles and formed into a sheet shape, and constitutes an active type sensor in cooperation with the vehicle speed sensor 80.

The baffle plate 70 includes a cylindrical portion 71 into which the baffle plate mounting portion 22 of the inner ring 20 is inserted and fixed by press-fitting, and an outer peripheral surface of the cylindrical portion 71 on the inner end in the vehicle width direction. A ring plate-like baffle portion 72 formed so as to protrude in a flange shape on the outer diameter side is integrally formed by, for example, sheet metal processing.
The baffle portion 72 of the baffle plate 70 has its outer surface in the vehicle width direction opposed to the encoder seal E with an interval in which a detection portion 81 of a vehicle speed sensor 80 described later is accommodated, and its outer peripheral edge portion. In addition, the baffle plate 70 is allowed to rotate around the axle with respect to the inner peripheral surface portion of the housing 40, and is arranged with a minute gap that prevents passage of foreign matters such as muddy water and pebbles.

The vehicle speed sensor 80 is provided with a detection portion 81 at one end of a main body formed in a columnar shape. The detection portion 81 detects the magnetic force of the encoder seal E so that the vehicle travels (hub) 10), a vehicle speed signal corresponding to the rotational speed of the hub 10 is output in accordance with the change in magnetic force to be detected.
The vehicle speed sensor 80 is inserted from the through hole 42 of the housing 40, and the detection portion 81 protrudes from the inner peripheral surface of the opening 41 of the housing 40, and is sandwiched between the encoder seal E and the baffle portion 72 of the baffle plate 70. It is fixed to the housing 40 in a state of facing the encoder seal E.

FIG. 2 is a sectional view of a drive wheel hub unit which is a reference example of the present invention. Note that, in this reference example and each example described later, portions that are substantially the same as those in Example 1 are denoted by the same reference numerals, description thereof is omitted, and differences are mainly described.
The drive wheel hub unit 2 is used, for example, as a rear wheel of a four-wheel drive (AWD) passenger car, and includes a hub 110 and an inner ring 120 instead of the hub 10 and the inner ring 20 of the first embodiment. On the other hand, the baffle plate 70 is omitted, and a drive shaft 190 is inserted on the inner diameter side of the hub 110.

  The hub 110 has an opening 117 that is a through hole into which a spline shaft 192 (to be described later) of the drive shaft 190 is inserted on the inner diameter side thereof. A spline that meshes with a spline (serration) formed on the outer peripheral surface of the spline shaft 192 is formed on the inner peripheral surface of the opening 117 so that driving force is transmitted. Further, the hub 110 is not provided with the crimping portion 13 like the hub 10, and the end surface on the inner side in the vehicle width direction is offset to the outer side in the vehicle width direction from the end surface on the inner side in the vehicle width direction of the inner ring 120. Is arranged.

  The inner ring 120 is not provided with a portion corresponding to the baffle plate mounting portion 22 in the inner ring 20, and an end surface on the inner side in the vehicle width direction is arranged at substantially the same position as the encoder seal E in the axle direction. The inner ring 120 is fixed to the hub 10 by being sandwiched between a wheel side joint portion 191 (to be described later) of the drive shaft 190 and the hub 10 instead of swinging caulking like the inner ring 20.

The drive shaft 190 is a rotating shaft that transmits driving force from a differential gear (not shown) to the wheels, and is a constant velocity joint outer ring 191, a spline shaft 192, a lock nut 193, and a baffle portion 194 that are arranged concentrically with respect to the axle. It has.
The constant velocity joint outer ring 191 is disposed on the inner side in the vehicle width direction with respect to the hub 110 and the inner ring 120, and the end surface on the outer side in the vehicle width direction is in contact with the end surface of the opposing inner ring 120.
The spline shaft 192 is formed to protrude outward in the vehicle width direction from the constant velocity joint outer ring 191, and is inserted into the opening 117 of the hub 110, and a tip portion of the spline shaft 192 passes through the opening 117 and protrudes to the outer side in the vehicle width direction. Has been placed. As described above, a spline that meshes with the spline on the inner peripheral surface portion of the opening 117 is formed on the outer peripheral surface portion of the spline shaft 192.
Further, the spline shaft 192 has a male screw portion (not shown) at the tip.
The lock nut 193 is screw-coupled to the male screw portion at the tip end portion of the spline shaft 192, and fixes the drive shaft 190 and the inner ring 120 to the hub 110 by the fastening force.

The baffle portion 194 is provided in a region adjacent to the inner ring 120 of the constant velocity joint outer ring 191 and is press-fitted into the constant velocity joint outer ring 191. The baffle portion 194 is opposed to the encoder seal E with an interval in the axle direction, and the outer peripheral edge portion thereof is formed so as to protrude outwardly from the outer peripheral surface of the constant velocity joint outer ring 191. The outer peripheral edge portion of the baffle portion 194 is disposed so as to face the inner peripheral surface of the housing 40 with a minute interval. The position and shape of the baffle part 194 with respect to the encoder seal E are formed substantially the same as the baffle part 72 of the baffle plate 70 in the first embodiment.
In this reference example, the detection unit 81 of the vehicle speed sensor 80 is disposed between the encoder seal E and the baffle unit 194.

As described above, according to the first embodiment, the following effects can be obtained.
(1) A so-called narrow gap is formed between the housing 40 and the baffle portion 72 by providing the baffle portion 72 which is fixed to the inner ring 20 and whose outer peripheral edge portion is disposed adjacent to the inner peripheral surface of the housing 40. Since the labyrinth portion is formed, the encoder seal E and the vehicle speed sensor 80 can be protected from foreign matters such as muddy water and pebbles even in a hub unit for a driven wheel into which the drive shaft is not inserted.
(2) By making the position and shape of the baffle portion 72 with respect to the encoder seal E substantially the same as the baffle portion 194 provided on the drive shaft 190 in the drive wheel hub unit 2, for example, the outer ring 30 and the housing 40 Components such as the outer oil seal 50, the inner oil seal 60, and the vehicle speed sensor 80 can be shared between the driven wheel hub unit 1 and the drive wheel hub unit 2, reducing the development man-hours and the parts. The kind of can be reduced.
(3) By using a so-called third generation type hub unit in which a raceway surface for guiding the ball B is formed on a part of the outer peripheral surface of the hub 10, the assembly workability is improved, and the size and accuracy are improved. Can be achieved.
(4) Since the inner ring 20 is fixed to the hub 10 by swinging caulking, for example, compared to the case where the inner ring 20 is fixed using another member such as a lock nut, the size is reduced, the weight is reduced, and the number of parts is reduced. Reliability can be improved and preload can be stabilized.

FIG. 3 is a cross-sectional view of a main part of a second embodiment of a driven wheel hub unit to which the present invention is applied.
The driven wheel hub unit 3 according to the second embodiment is different from the driven wheel hub unit 1 according to the first embodiment in that an inner ring 220 and a baffle plate 270 described below are provided instead of the inner ring 20 and the baffle plate 70. is there.
The inner ring 220 is not provided with a portion corresponding to the baffle plate mounting portion 22 in the inner ring 20, and an end surface on the inner side in the vehicle width direction is disposed at substantially the same position as the encoder seal E in the axle direction. Similar to the inner ring 20 of the first embodiment, the inner ring 220 is fixed to the hub 10 by swinging and caulking the end portion of the hub 10 to form the caulking portion 13.

The baffle plate 270 is inserted into the inner diameter side of the concave portion 12 of the hub 10 and is press-fitted and fixed, and from the outer peripheral surface at the inner end in the vehicle width direction of the cylindrical portion 271 to the outer diameter side. A ring plate-like baffle portion 272 formed so as to protrude in a collar shape is integrally formed by, for example, sheet metal processing.
The baffle portion 272 of the baffle plate 270 is similar to the baffle portion 72 of the first embodiment in that the outer surface in the vehicle width direction is spaced from the encoder seal E by the interval in which the detection portion 81 of the vehicle speed sensor 80 is accommodated. The outer peripheral edge portion of the housing 40 is arranged with a small gap with respect to the inner peripheral surface portion of the housing 40.
According to the second embodiment described above, in addition to the same effects as the first embodiment described above, since it is not necessary to process the baffle plate mounting portion on the inner ring 220, the work of the inner ring 220 can be simplified, Further, the inner ring 220 can be shared with the inner ring 120 of the drive wheel hub unit 2 of the reference example, for example.

FIG. 4 is a cross-sectional view of an essential part of a third example of a driven wheel hub unit to which the present invention is applied. FIG. 5 is an enlarged view of a portion V in FIG.
The driven wheel hub unit 4 of the third embodiment includes an inner ring 320 similar to the inner ring 220 of the second embodiment. Instead of the inner oil seal 60 and the baffle plate 70, a baffle integrated inner oil seal 360 described below is provided. It differs from Example 1 in the point provided.

As shown in FIG. 5, the inner oil seal 360 includes a rubber lip 361 with a cored bar and a slinger 362 integrated with a baffle plate.
The cored rubber lip 361 is fixed to the inner peripheral surface portion of the outer ring 30 and includes a plurality of lip portions protruding toward the inner diameter side and the inner side in the vehicle width direction.
The slinger 362 is fixed to the outer peripheral surface portion of the inner ring 320, and includes a flange portion 363, an outer cylinder portion 364, an inner cylinder portion 365, a protruding cylinder portion 366, and a baffle portion 367 that are formed substantially concentrically with respect to the axle. It has become.

The collar portion 363 is formed in a ring plate shape, and is a portion that is disposed facing the rubber lip 361 with a cored bar in the axle direction, and an encoder seal E is attached to a surface portion on the inner side in the vehicle width direction. .
The outer cylinder part 364 is a cylindrical part extending from the inner peripheral edge of the collar part 363 to the outside in the vehicle width direction, and is a part arranged on the inner diameter side with respect to the rubber lip 361 with a cored bar.
The inner cylindrical portion 365 is a cylindrical portion that is formed by folding back from the outer width direction outer end portion of the outer cylindrical portion 364 to the inner diameter side thereof, and is inserted into the inner diameter side of the outer cylindrical portion 364. The outer peripheral surface portion of the inner ring 320 is inserted and fixed. An end portion of the inner cylinder portion 365 on the inner side in the vehicle width direction is disposed at substantially the same position as the end surface of the inner ring 320.

The protruding cylindrical portion 366 is a cylindrical portion that is further extended inward in the vehicle width direction from the end portion on the inner side in the vehicle width direction of the inner cylindrical portion 365 and is protruded from the end surface of the inner ring 320. The protruding cylindrical portion 366 is formed to have an outer diameter smaller than that of the inner cylindrical portion 365 in order to prevent interference with the detection portion 81 of the vehicle speed sensor 80 in the radial direction.
The baffle portion 367 is a ring plate-like portion formed so as to project from the end portion on the inner side in the vehicle width direction of the protruding cylindrical portion 366 to the outer diameter side thereof. In the baffle portion 367, as in the baffle portion 72 of the baffle plate 70 in the first embodiment, the outer surface in the vehicle width direction is spaced from the encoder seal E by the interval in which the detection portion 81 of the vehicle speed sensor 80 is accommodated. The outer peripheral edge portion of the housing 40 is arranged with a small gap with respect to the inner peripheral surface portion of the housing 40.
According to the third embodiment described above, in addition to the same effects as the first embodiment described above, the baffle portion 367 is formed integrally with the slinger 362 of the inner oil seal 360. The process for assembling the driving wheel hub unit 4 can be simplified.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the technical scope of the present invention.
(1) The configuration of the driven wheel hub unit is not limited to the configuration of each of the embodiments described above, and can be changed as appropriate. For example, each embodiment is provided with an angular ball bearing having a ball as a rolling element. However, the present invention is not limited to this. For example, a tapered roller bearing may be provided.
(2) The driven wheel hub unit of each embodiment is a so-called third generation unit in which a raceway surface is formed on a part of the outer peripheral surface of the hub. However, the present invention is not limited to this, and for example, the raceway surface is connected to the inner ring. Further, the present invention can also be applied to a previous generation type driven wheel hub unit that is formed only on the outer ring and uses a hub without a raceway surface combined with the inner ring.
(3) The baffle portion of each embodiment is formed by sheet metal processing, for example, and is press-fitted and fixed to the hub or inner ring. However, the material of the baffle portion, the manufacturing method, and the fixing method to the hub or inner ring are not particularly limited. Can be changed as appropriate.
(4) The driven wheel hub unit of each embodiment is for a rear wheel of a front wheel drive vehicle, but the present invention is not limited to this and can be applied to a front wheel of a rear wheel drive vehicle.

It is sectional drawing of Example 1 of the hub unit for driven wheels to which this invention is applied. It is sectional drawing of the hub unit for drive wheels which is a reference example of this invention. It is principal part sectional drawing of Example 2 of the hub unit for driven wheels to which this invention is applied. It is principal part sectional drawing of Example 3 of the hub unit for driven wheels to which this invention is applied. It is the V section enlarged view of FIG.

Explanation of symbols

1 Hub unit for driven wheel 10 Hub 20 Inner ring 30 Outer ring 40 Housing 50 Outer oil seal 60 Inner oil seal 70 Baffle plate 72 Baffle part 80 Vehicle speed sensor B Ball E Encoder seal

Claims (7)

A hub to which the wheels are mounted;
An inner ring fixed to the hub and having a raceway surface formed on the outer peripheral surface portion;
An outer ring fixed to a housing supported by the suspension device and having a raceway surface on the inner peripheral surface portion;
A rolling element disposed between the raceway surface of the inner ring and the raceway surface of the outer ring;
An encoder that is fixed with respect to the inner ring and arranged inward in the vehicle width direction;
An annular ring that is fixed to the inner ring, faces the encoder with an interval in which a detection part of a vehicle speed sensor is accommodated, and an outer peripheral edge portion is disposed adjacent to the inner peripheral surface of the outer ring or the housing. A driven wheel hub unit comprising a baffle portion. The driven wheel hub unit according to claim 1,
The driven wheel hub unit, wherein the encoder is a magnetic encoder seal fixed to an oil seal slinger provided between the inner ring and the outer ring. In the hub unit for driven wheels according to claim 1 or 2,
The rolling elements are arranged in a double row spaced apart in the axle direction of the wheel,
At least one row of the rolling elements is disposed between a raceway surface of the outer ring and a raceway surface formed integrally with the outer peripheral surface of the hub. The hub unit for a driven wheel according to claim 3,
The inner ring is fixed to the hub by swinging and tightening an end portion in the vehicle width direction of the hub. The driven wheel hub unit according to any one of claims 1 to 4, wherein:
The driven wheel hub unit, wherein the baffle portion is formed integrally with a cylindrical portion into which an outer peripheral surface portion of the inner ring is inserted. The driven wheel hub unit according to any one of claims 1 to 4, wherein:
The said baffle part is integrally formed with the cylindrical part inserted in the internal diameter side of the said hub. The hub unit for driven wheels characterized by the above-mentioned. The driven wheel hub unit according to any one of claims 1 to 4, wherein:
The driven wheel hub unit, wherein the baffle portion is formed integrally with an oil seal slinger provided between the inner ring and the outer ring.

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