JP2013061052A - Rolling bearing unit for supporting wheel with encoder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing unit for supporting a wheel with an encoder capable of preventing the invasion of water from a fitting face between a slinger and an inner ring without increasing production costs and a shape (size) of a pack seal to maintain bearing performance over a long period of time.SOLUTION: The slinger 38 includes: a slinger cylinder 39 fixed around the axial inner end outer circumferential face of the inner ring 6 by interference fitting; and a slinger annular ring 40 bent in the diameter direction toward the inner circumferential face of an outer ring 2 from the axial inner end edge of the slinger cylinder 39. In an encoder 15a supported and fixed to the axial inside face of the slinger annular ring 40, an extension 50 protruded toward the internal diameter side beyond the internal diameter of the slinger 38 is formed in the internal diameter side thereof, and the extension 50 is attracted to the axial inside face of a stepped part 51 formed on the outer circumferential side of the axial inner end face of the inner ring 6 by a magnetic force.

Description

  The present invention relates to a wheel bearing rolling bearing unit for rotatably supporting a vehicle (automobile) wheel with respect to a suspension device, for example, and includes a seal device integrated with a magnetic encoder for detecting the rotational speed of the wheel. Further, the present invention relates to an improvement of a wheel bearing rolling bearing unit with an encoder.

  2. Description of the Related Art Conventionally, a wheel bearing rolling bearing unit in which a rolling bearing such as a ball bearing or a tapered roller bearing is incorporated in a rotation supporting portion of a wheel is known. And, in order to control the anti-lock brake system (ABS) and the traction control system (TCS), a seal device integrated with a magnetic encoder for detecting the rotational speed of the wheel is incorporated in this rolling bearing unit for supporting the wheel. However, a wheel bearing rolling bearing unit with an encoder is also known. FIG. 3 shows a structure for rotatably supporting a driving wheel of a vehicle on a suspension device as an example of a rolling bearing unit with an encoder-equipped wheel support having such a sealing device with an encoder.

  An encoder-supported axle support rolling bearing unit 1 includes an outer ring 2 that is a stationary wheel, a hub 4 that is a rotating wheel, and a plurality of rolling elements 11 and 11. The hub 4 is formed by combining the hub body 5 and the inner ring 6. The inner ring 6 is press-fitted into a small-diameter step portion 16 formed in the hub body 5, and the hub body 5 and the inner ring 6 are integrated by a caulking portion 17. Yes. Each of the rolling elements 11, 11 is between a double row outer ring raceway 9, 9 formed on the inner peripheral surface of the outer ring 2 and a double row inner ring raceway 10, 10 formed on the outer peripheral surface of the hub 4. A plurality of them are provided so as to be freely rollable by the cage 12. Then, in order to rotatably support the wheel with respect to the suspension device, the attachment portion 3 provided on the outer peripheral surface of the outer ring 2 is fixed to the knuckle 18 constituting the suspension device, and the rotation flange 8 provided on the hub body 5. A wheel (not shown) is coupled and fixed to the wheel. Further, since the structure shown in FIG. 3 is a structure for supporting the drive wheel, a spline shaft (not shown) attached to the constant velocity joint is engaged with the spline hole 7 provided in the central portion of the hub body 5. I am letting.

  In the above-mentioned wheel bearing rolling bearing unit 1 with an encoder, in the inner space where the rolling elements 11 and 11 are installed, which is located between the inner peripheral surface of the outer ring 2 and the outer peripheral surface of the hub 4, The grease is sealed to lubricate the rolling contact portions between the rolling surfaces of the rolling elements 11 and 11 and the outer ring raceways 9 and 9 and the inner ring raceways 10 and 10. Further, a sealing device 13 is provided between the inner peripheral surface of the outer ring 2 in the axial direction and the outer periphery of the intermediate portion of the hub body 5, and the inner peripheral surface of the inner ring 2 and the inner peripheral surface of the inner ring 2 in the axial direction. A pack seal 14 is provided between the outer peripheral surface of the inner end portion in the axial direction and closes both axial end openings of the bearing internal space. In the present specification, “inner with respect to the axial direction” means a side that is closer to the middle in the width direction of the vehicle when assembled to the vehicle, and the right side of each figure. On the other hand, on the left side of each figure, the side that is outside the width direction of the vehicle is referred to as the outside in the axial direction.

  As shown in FIG. 4, the pack seal 14 that closes the opening on the inner end side in the axial direction of the outer ring 2 includes a seal ring 30 that is fitted and fixed to the inner end in the axial direction of the outer ring 2, and a magnetic material such as a steel plate or stainless steel plate. A slinger 38 that is made of a metal plate and is fitted and fixed to the inner end of the inner ring 6 in the axial direction, and an encoder 15 that is supported and fixed to the slinger 38. The seal ring 30 includes a metal core 31 and a seal material 32, and the metal core 31 includes a seal cylindrical portion 33 that can be fitted and fixed to the inner peripheral surface of the axially inner end portion of the outer ring 2, and the seal cylinder. The seal ring portion 34 that is bent radially inward from the outer edge in the axial direction of the portion 33 is substantially L-shaped in cross section, and has an annular shape as a whole. The sealing material 32 is made of an elastic material such as an elastomer such as rubber, and is bonded to the metal core 31 by baking or vulcanization adhesion, and has three sealing lips having a base end portion on the metal core 31. 35-37.

  Also, the slinger 38 is a slinger cylindrical portion 39 that can be fitted and fixed to the outer peripheral surface of the inner ring 6 in the axial direction, and a slinger ring that is bent radially outward from the axial inner end edge of the slinger cylindrical capital 39. The section 40 is provided with a portion 40 and has an L shape in cross section, and the whole is an annular shape. Of the three seal lips constituting the seal ring 30, the leading edge of the side lip 35 provided in the state of projecting inward in the axial direction on the outermost diameter side constitutes the slinger 38. The slinger ring portion 40 is in sliding contact with the outer circumferential surface of the slinger ring portion 40 over the entire circumference. In contrast, the remaining two leading edges of the main lip 36 and the grease lip 37 are in sliding contact with the outer peripheral surface of the slinger cylindrical portion 39 constituting the slinger 38 over the entire circumference.

  The encoder 15 is made of a rubber magnet (made of a permanent magnet) in which S poles and N poles are alternately arranged in the circumferential direction. That is, the encoder 15 is formed by forming a rubber magnet in which ferrite powder is mixed in rubber into an annular shape, and is magnetized in the axial direction. The magnetization direction is changed alternately and equidistantly in the circumferential direction. Therefore, on the side surface in the axial direction of the encoder 15, the S pole and the N pole are alternately arranged at equal intervals over the circumferential direction. Such an encoder 15 is supported on the inner side surface of the slinger ring portion 40 in the axial direction. And the detection part of the sensor 20 for rotational speed detection supported by the knuckle 18 which is a non-rotating component is made to oppose the to-be-detected surface which is an axial direction inner surface of the encoder 15. FIG.

  Further, the outer peripheral edge portion of the encoder 15 and the outer peripheral edge portion of the slinger ring portion 40 are closely opposed to the inner peripheral surface of the axial inner end portion of the seal cylindrical portion 33 over the entire circumference. Thereby, the labyrinth seal for preventing intrusion of foreign matters such as rainwater, muddy water, and dust existing in the external air is formed in the portion.

  In the case of the wheel bearing rolling bearing unit 1 having the conventional structure as described above, the both axial end openings of the bearing inner space are closed by the seal device 13 and the pack seal 14 so that the bearing inner space is filled. It prevents foreign matter such as muddy water from entering and prevents the grease enclosed in this internal space from leaking outside. Further, when the slinger 38 externally fitted and fixed to the inner ring 6 rotates with the rotation of the wheel, the output of the sensor 20 facing the encoder 15 rotating with the slinger 38 changes. The frequency at which the output of the sensor 20 changes is proportional to the rotational speed of the wheel. Therefore, if the output signal of the sensor 20 is input to a controller (not shown), the rotational speed of the wheel can be obtained and the ABS and TCS can be controlled appropriately.

  However, the pack seal 15 having a conventional structure as shown in FIG. 4 still has room for improvement from the viewpoint of further improving the sealing performance. That is, as described above, the slinger cylindrical portion 39 constituting the slinger 38 is externally fitted and fixed to the inner end portion in the axial direction of the inner ring 6. However, the inner ring 6 made of bearing steel and the slinger 38 made of steel plate are metal-to-metal fittings to avoid the presence of minute gaps on the fitting surface, such as scratches that occur when the slinger 38 is pressed into the inner ring 6. It is difficult to do. For this reason, there is a possibility that moisture may enter the bearing internal space from this fitting surface, and it is necessary to improve the sealing performance.

  As a prior art for improving this portion, Patent Document 1 discloses that a fitting lip is provided by providing a lip on the inner diameter side of an encoder attached to a slinger and elastically abutting the lip on the outer peripheral surface of the inner ring. The pack seal with the encoder which improved the sealing performance of the is described. Further, in Patent Document 2, a shielding lip made of an elastic member is integrally joined to the inner diameter side of a slinger, and this shielding lip is brought into contact with an end portion of the inner ring, so that rainwater or the like is generated from the fitting portion between the slinger and the inner ring. A rolling bearing unit for wheel support with an encoder that prevents entry into the interior is described.

Japanese Patent Laid-Open No. 2004-340979 JP 2006-125483 A

However, the magnetic rubber forming the encoder is a mixture of 80 to 90 wt% magnetic material powder such as ferrite and the remaining 10 to 20 wt% rubber material (NBR (nitrile rubber) or ACM (acrylic rubber)). Therefore, it is a brittle material that is inferior in elongation and elasticity compared to general rubber. Therefore, as in Patent Document 1, there is a problem that it is difficult to give a sufficient urging force (rubber elasticity and tightening allowance) to prevent water from entering the lip of the magnetic rubber provided on the inner diameter portion of the encoder. . Further, as in Patent Document 2, it is not preferable to provide a sealing material separately from the encoder because the manufacturing cost increases.
Further, since the wheel support bearing unit is used in a severe muddy water environment, there is a problem that the encoder is easily damaged or worn. As a countermeasure, an encoder using a plastic magnet formed by mixing a magnetic powder with a thermoplastic resin as a binder may be used. Plastic magnets are harder and less flexible than magnetic rubber and are more difficult to seal with their lips.

  In view of the circumstances as described above, the present invention prevents moisture from entering the bearing from the fitting surface between the slinger and the inner ring without increasing the manufacturing cost and shape (size) of the pack seal. An object of the present invention is to provide a wheel bearing rolling bearing unit with an encoder capable of maintaining the bearing performance over a long period of time.

A rolling bearing unit for supporting a wheel with an encoder according to the present invention includes a rotating wheel having a rotating flange for mounting a wheel and having a rotating side track on a rotating side circumferential surface, and a stationary wheel having a stationary side track on a stationary side peripheral surface, A plurality of rolling elements are provided between the rotating side track and the stationary side track so as to be freely rollable. A seal fixed to the stationary side circumferential surface in order to close an end opening of a space existing in a portion between the rotating side circumferential surface and the stationary side circumferential surface, and to detect a rotational speed of the rotary orbit transfer. A ring, a slinger fixed to the rotation-side peripheral surface, and an encoder supported and fixed to the slinger. The slinger is formed by bending a metal plate to form an annular shape as a whole with an L-shaped cross section, and the stationary portion from the axially inner end green of the cylindrical portion that is coupled and fixed to the peripheral surface of the rotating side. And the encoder is a magnet in which S poles and N poles are alternately magnetized in the circumferential direction, and is arranged in the axial direction of the annular part. It is supported and fixed to the side.
In particular, in the case of the wheel support rolling bearing unit with an encoder according to the present invention, the entire surface of the encoder is magnetized, and an extended portion of the encoder that extends to the inner diameter side of the slinger is It is attracted to the inner surface of the ring in the axial direction by magnetic force.

  In the rolling bearing unit with a wheel support with an encoder of the present invention, a step portion is formed on the inner side surface in the axial direction of the rotating wheel, and the extension portion is adsorbed to the step portion.

According to the present invention, without increasing the manufacturing cost and shape (size) of the pack seal, moisture can be prevented from entering the inside of the bearing from the fitting surface between the slinger and the inner ring, and the bearing performance can be improved for a long time. Can be maintained.
That is, in the case of the wheel support bearing unit with an encoder of the present invention, the extension portion of the encoder that extends to the inner diameter side of the slinger is adsorbed to the inner side surface in the axial direction of the inner ring by magnetic force. Therefore, by covering the mating surface between the slinger and the inner ring with the encoder, the external muddy water does not reach the mating surface, so that moisture can be prevented from entering the bearing through the mating surface.
In addition, it is not necessary to add a new manufacturing process by extending the inner diameter portion of the encoder (enhancing the area of the detection surface of the encoder), so that the manufacturing cost does not increase. And the seal ring and slinger of a pack seal can use the same structure as before, and it is not necessary to change the shape (size).
Furthermore, since the area of the non-detection surface is enlarged by the extension portion of the encoder, the magnetic force increases, and the rotation detection accuracy of the wheel by the sensor can be improved and stabilized.
Further, the extension portion of the encoder seals the inside of the bearing by being attracted and adhered to the inner ring by a magnetic force, and the sealing performance does not depend on the tightening force (elasticity and tightening allowance) of the encoder. Therefore, sufficient sealing performance can be obtained even with magnetic rubber or plastic magnets that are inferior in elasticity.

The figure equivalent to FIG. 4 which shows the 1st example of embodiment of this invention. The figure similar to FIG. 1 which shows a 2nd example similarly. Sectional drawing of the rolling bearing unit for wheel support with an encoder of the conventional structure. FIG. 4 is a partially enlarged cross-sectional view of the pack seal assembled in FIG. 3.

(First example of embodiment)
FIG. 1 shows a first example of an embodiment of the present invention. As shown in FIGS. 3 and 4, the pack seal 14a constituting the wheel support bearing unit with an encoder in this example is provided between the hub 4 that is a rotating wheel that rotates relative to each other and the outer ring 2 that is a stationary wheel. It is mounted and closes the axially inner end opening portion of the internal space that exists between the outer peripheral surface of the hub 4 and the inner peripheral surface of the outer ring 2. The structure and operation / effect of the portion other than the pack seal 14a including the sealing device 13 for closing the axially outer end opening of the internal space is as follows. This is the same as the case of the rolling bearing unit. For this reason, illustration and description of overlapping portions are omitted or simplified, and the pack seal 14a will be mainly described below.

The pack seal 14a of this example also includes a seal ring 30, a slinger 38, and an encoder 15a. Among these, the seal ring 30 includes a cored bar 31 and a sealing material 32. The metal core 31 is formed by bending a metal plate such as a mild steel plate to form an annular shape as a whole with a substantially L-shaped cross section, and is fitted and fixed to the inner peripheral surface of the axially inner end portion of the outer ring 2 by an interference fit. The seal cylindrical portion 33 is formed, and the seal annular portion 34 is bent radially inward from the outer end edge in the axial direction of the seal cylindrical portion 33 toward the inner peripheral surface of the inner ring 6.
The sealing material 32 is made of an elastic material such as an elastomer such as rubber, and has three sealing lips (side lip 35, main lip) whose base ends are attached and supported by the core metal 31 over the entire circumference. A lip 36 and a grease lip 37).

  The slinger 38 is formed by bending a metal plate and is formed into an annular shape as a whole with an L-shaped cross section. The slinger cylinder is fitted and fixed to the outer peripheral surface of the inner ring 6 in the axial direction by an interference fit. And a slinger annular portion 40 bent in the radial direction from the inner end edge in the axial direction of the slinger cylindrical portion 39 toward the inner peripheral surface of the outer ring 2. The three seal lips (side lip 35, main lip 36, and grease lip 37) are brought into sliding contact with the outer peripheral surface of the slinger cylindrical portion 39 and the axially outer surface of the slinger ring portion 40.

The encoder 15a is formed of a magnetic rubber in which ferrite powder is mixed in rubber in a ring shape, and is magnetized in the axial direction. The magnetization direction is changed alternately and at equal intervals over the circumferential direction. Therefore, on the side surface in the axial direction of the encoder 15a, the S pole and the N pole are alternately arranged at equal intervals over the circumferential direction. The encoder 15 a is supported and fixed on the inner side surface in the axial direction of the slinger ring portion 40.
Further, in the case of this example, an extending portion 50 that protrudes further toward the inner diameter direction than the inner diameter of the slinger 38 is formed on the inner diameter side portion of the encoder 15a over the entire circumference.

On the other hand, a step portion 51 is formed over the entire circumference on the outer peripheral side of the inner end surface in the axial direction of the inner ring 6 to which the slinger 38 is fitted and fixed. The extending portion 50 of 15a is adsorbed by a magnetic force. The axial dimension (depth) of the step portion 51 is the same as or slightly larger than the width (axial dimension) of the extending portion 50, and the extending portion 50 is accommodated in the step portion 51. Therefore, the axially outer side surface of the extending portion 50 does not protrude from the axially inner end surface of the inner ring 6. The radial dimension of the step portion 51 is slightly smaller than the inner diameter of the extension portion 50 so that a gap exists between the inner peripheral surface of the extension portion 50 and the outer peripheral surface of the step portion 51. .
Furthermore, the portion where the extended portion 50 is adsorbed on the inner side surface in the axial direction of the step portion 51 has a good surface roughness, and is finished with a foam bite, and there is no cutting feed line. It can also be a good surface.

Further, when the encoder 15a of the present invention is supported and fixed to the slinger 38, the encoder 15a may be vulcanized and bonded integrally with the slinger 38, or a separately vulcanized encoder 15a may be bonded and fixed to the slinger 38. You can also.
Further, when the encoder 15a is magnetized, the inner ring 6 may be magnetized before being press-fitted and fixed (fixed to the slinger 38), or may be magnetized after being press-fitted and fixed to the inner ring 6 while being fixed to the slinger 38. You can also do it. When the encoder 15a is magnetized independently, a temporary back yoke is brought into contact with the slinger 38 side of the extension portion 50 so that the magnetic force of the extension portion 50 is strongly magnetized in the same manner as the encoder 15a. Can be magnetized. Further, when magnetizing after press-fitting and fixing to the inner ring 6, the inner ring 6 itself becomes a back yoke, so the above-described means is unnecessary, but residual magnetism remains in the inner ring 6 due to magnetization, so the encoder 15a is installed. It is desirable to magnetize alone.

In the case of this example having the above-described configuration, moisture enters the bearing from the fitting surface between the slinger 38 and the inner ring 6 without increasing the manufacturing cost and shape (size) of the pack seal 14a. In the case of the present invention, the encoder 15a covers the fitting surface between the slinger 38 and the inner ring 6 closer to the inner diameter side than the slinger 38. The extended portion 50 is formed so as to be attracted to the axially inner side surface of the inner ring 6 by a magnetic force. Accordingly, since the fitting surface is sealed by the extending portion 50 adsorbed to the rotating wheel 6, the external muddy water or the like does not reach the fitting surface between the slinger 38 and the inner ring 6, so that moisture is absorbed through the fitting surface. There is no intrusion inside.

  Moreover, since the extension part 50 extends the inner diameter part of the encoder 15a and is formed of the same material as the encoder 15a, it can be manufactured by the same manufacturing method as before and a new manufacturing process needs to be added. Since there is no, manufacturing cost does not increase. The seal ring 30 and the slinger 38 of the pack seal 14a can also have the same structure as the conventional one, and there is no need to change the shape (size) or change the design.

  Furthermore, the extension part 50 of the encoder 15a increases the area of the non-detection surface for measuring the rotational speed, and the inner ring 6 attracted by the extension part 50 also functions as a back yoke. As the magnetic force generated increases and the output of the sensor increases, the detection accuracy of the rotational speed of the wheel is improved and stabilized. And since ABS and TCS can be controlled with high accuracy, the vehicle can be kept in a more stable state.

In addition, the inner surface in the axial direction to which the extending portion 50 of the step portion 51 is adsorbed is processed to have a good surface roughness, so that the adsorbing portion 50 is adsorbed (adsorbed only at the top of the roughness). Therefore, the sealing (waterproofing) performance is obtained. Furthermore, if it finishes with a foam bite etc. and the cutting feed is erased, the sealing (waterproof) performance is further improved and the effect of the inner ring 6 as a back yoke is also improved.
Further, even if an inevitable error in manufacturing and assembling occurs between the inner peripheral surface of the extending portion 50 and the outer peripheral surface of the step portion 51, the inner peripheral surface of the extending portion 50 and the outer periphery of the step portion 51. Since there is a slight gap that does not contact the surface, the extended portion 50 can be stably adsorbed to the inner side surface in the axial direction of the stepped portion 51 (the extended portion 50 is the outer periphery of the stepped portion 51). Does not interfere with the surface). Further, the gap constitutes a labyrinth seal, and splashed muddy water or the like prevents the suction surface between the extension portion 50 and the step portion 51 from hitting directly.

Moreover, the extension portion 50 of the encoder 15a seals the inside of the bearing by being attracted and adhered to the inner ring 6 by a magnetic force, and the sealing performance depends on the tightening force (elasticity and tightening allowance) of the encoder 15a. Not done. Therefore, sufficient sealing performance can be obtained even with the encoder 15a made of magnetic rubber or plastic magnet having poor elasticity.
Other configurations, operations and effects are the same as those of the conventional structure described above.

(Second example of embodiment)
FIG. 2 shows a second example of the embodiment of the present invention. In the case of this example, the shape of the encoder 15b of the pack seal 14b constituting the wheel bearing rolling bearing unit with an encoder is different from that of the first example of the above-described embodiment. That is, in the case of this example, the axially outer side surface (extension part) of the encoder 15b is used as a stealer that rises from a part bent at the slinger cylindrical part 39 at the inner edge of the slinger ring part 40 that supports and fixes the encoder 15b. A recess 52 is formed over the entire circumference on the outer side in the axial direction of the base end portion of 50b. Further, a concave portion 53 is formed over the entire circumference on the inner side surface of the encoder 15b in the axial direction on the outer diameter side of the concave portion 52 as stealing.

Accordingly, when the encoder 15b is supported and fixed to the slinger 38, the encoder 15b and the slinger 38 can be easily vulcanized and bonded together. Furthermore, a plastic magnet is applied as the magnetic material, and the encoder 15b can be manufactured by adhesive molding (insert molding).
At the time of molding the encoder 15b, the molten rubber material is a smooth liquid, and it is difficult to stop the flow of the molten rubber by fitting the radial molds at the time of molding. In this example, in order to prevent the flow of the molten rubber toward the inner diameter side of the slinger 38, the flow of the molten rubber is caused by abutting the mold at the inner diameter edge of the slinger ring portion 40 against the portion bent at the slinger cylindrical portion 39. In order to prevent the mold from being forcibly removed in the axial direction, a concave portion 52 is provided as a stealer that rises from a portion bent at the slinger cylindrical portion 39 at the inner edge of the slinger annular portion 40. Further, if the concave portion 53 is provided on the inner side surface in the axial direction of the encoder 15b as a stealer, it will be easier to forcibly remove it.
However, the strength of the thinned portion due to the formation of the concave portion 52 and the concave portion 53 is lower than that of the other portion, so that the reinforcing material (for example, metal or It is preferable to partially reinforce by casting a high melting point resin (for example, a net made of polyimide or tetrafluoroethylene resin).

  In the case of this example having the above-described configuration, the encoder 15b can be formed integrally with the slinger 38, and can be manufactured at a lower cost than the case where the encoder 15b and the slinger 38 are separately manufactured and bonded. . That is, when the encoder 15b is a magnetic rubber, it is manufactured by vulcanization adhesion, and when the encoder 15b is a plastic magnet, it is manufactured by adhesion molding (insert molding).

  In carrying out the present invention, the number of seal lips provided on the seal material may be one, or two or three or more as in the above examples. In each example of the above-described embodiment, the inner ring rotating type wheel support rolling bearing unit with an engine kneader has been described. However, the present invention is also applied to an outer ring rotating type wheel supporting rolling bearing unit with an encoder. Applicable.

  The wheel support rolling bearing unit with an encoder according to the present invention is applied to a wheel support bearing unit in which a seal is attached to an opening of an annular space formed between a stationary wheel (outer ring) and a rotating wheel (hub). can do.

DESCRIPTION OF SYMBOLS 1 Rolling bearing unit for wheel support with encoder 2 Outer ring 3 Mounting part 4 Hub 5 Hub main body 6 Inner ring 7 Spline hole 8 Rotating flange 9 Outer ring raceway 10 Inner ring raceway 11 Rolling element 12 Cage 13 Seal device 14, 14a, 14b Pack seal 15 15a, 15b Encoder 16 Small diameter step portion 17 Caulking portion 18 Knuckle 20 Sensor 30 Seal ring 31 Seal core 32 Seal material 33 Seal cylindrical portion 34 Seal ring portion 35 Side lip 36 Main lip 37 Grease lip 38 Slinger 39 Slinger cylindrical portion 40 Slinger ring part 50, 50b Extension part 51 Step part 52, 53 Concave part

Claims (2)

A rotating wheel having a rotating flange for mounting a wheel and having a rotating side track on the rotating side peripheral surface, a stationary wheel having a stationary side track on the stationary side peripheral surface, and between the rotating side track and the stationary side track A plurality of rolling elements provided so as to freely roll,
A seal fixed to the stationary side circumferential surface in order to close an end opening of a space existing in a portion between the rotating side circumferential surface and the stationary side circumferential surface, and to detect a rotational speed of the rotary orbit transfer. A ring, a slinger fixed to the rotation-side peripheral surface, and an encoder supported and fixed to the slinger,
The slinger is formed by bending a metal plate to form an annular shape as a whole with an L-shaped cross section, and the stationary portion from the axially inner end green of the cylindrical portion that is coupled and fixed to the peripheral surface of the rotating side. And an annulus that is bent toward the side surface,
The encoder is a magnet in which S and N poles are alternately magnetized in the circumferential direction, and is supported and fixed on the inner surface in the axial direction of the annular portion.
In wheel bearing rolling bearing unit with encoder,
The entire surface of the encoder is magnetized, and an extended portion of the encoder that extends to the inner diameter side of the slinger is attracted to the inner surface in the axial direction of the rotating wheel by a magnetic force. Rolling bearing unit for wheel support with encoder.   The rolling bearing unit for supporting a wheel with an encoder according to claim 1, wherein a step portion is formed on an inner side surface in the axial direction of the rotating wheel, and the extension portion is adsorbed to the step portion.

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