JP6103002B2 - Hub unit with encoder and combination seal ring - Google Patents

Description

  The present invention provides a hub unit for rotatably supporting a vehicle wheel with respect to a suspension device, and a plurality of hub units exist between mutually opposing peripheral surfaces of a rotation side raceway and a stationary side raceway. The end opening of the annular space in which the rolling elements are installed is closed with a combination seal ring composed of a slinger and a seal ring, and an encoder is attached and fixed to the inner side surface of the slinger in the axial direction. It relates to the improvement of the hub unit with a ring. Specifically, it is intended to realize a structure in which the sealing property of the fitting surface between the rotating raceway and the slinger can be satisfactorily maintained over a long period of time.

   In order to rotatably support the wheel of an automobile with respect to a suspension device, a hub unit 1 as shown in FIG. In the hub unit 1, an outer ring 2 that is a stationary side race ring and a hub 3 that is a rotation side race ring are arranged concentrically with each other. And the double row outer ring raceways 4 and 4 each provided on the inner peripheral surface of the outer ring 2 are stationary side raceways, and the double row each provided on the outer peripheral surface of the hub 3 and each is a rotary side raceway. Between the inner ring raceways 5 and 5, a plurality of balls 6 and 6 each of which is a rolling element are arranged in each row. These balls 6 and 6 are held by the cages 7 and 7 so as to be freely rollable. With such a configuration, the hub 3 is rotatably supported on the inner diameter side of the outer ring 2 supported and fixed to a suspension device.

  Openings at both ends of the annular space 8 in which the balls 6, 6 are installed between the inner peripheral surface of the outer ring 2 and the outer peripheral surface of the hub 3 are formed around the entire periphery by a seal ring 9 and a combination seal ring 10, respectively. It is crawling up. Among these, the seal ring 9 includes a metal core 11 made of a metal plate and a plurality of seal lips 12 made of an elastic material. Then, with the core metal 11 being fitted into one end portion of the outer ring 2 by an interference fit, the tip edge of each seal lip 12 is slidably contacted with the outer peripheral surface of the intermediate portion of the hub 3 over the entire circumference. I am letting.

The combination seal ring 10 includes a slinger 13 and a first seal ring 14. Of these, the slinger 13 is formed by bending a metal plate to form an entire ring shape with an L-shaped cross section. The slinger 13 is bent radially outward from the cylindrical portion 15 and the axial edge of the cylindrical portion 15. And an annular section 16 and a curved surface section 17 having an arcuate cross section existing in a continuous portion of the cylindrical section 15 and the annular section 16. Such a slinger 13 is fixed to the hub 3 by fitting the cylindrical portion 15 to the outer peripheral surface of the end portion of the hub 3 (the inner ring constituting the hub 3 together with the hub body) by an interference fit. Yes. The first seal ring 14 includes a metal core 18 made of a metal plate and a plurality of seal lips 19 made of an elastic material. Then, with the metal core 18 being fitted into the other end of the outer ring 2 by an interference fit, the tip edge of each seal lip 19 is brought into sliding contact with the surface of the slinger 13 over the entire circumference. Yes.

  Further, in order to be able to measure the rotational speed of the wheel coupled and fixed to the hub 3, the inner side surface in the axial direction of the annular portion 16 of the slinger 13 constituting the combination seal ring 10 as described above The right side of each figure is said to be the center side in the width direction of the vehicle body in the state where it is assembled to an automobile, while the end in the width direction, which is the left side of each figure, is said to be outside in the axial direction. The same applies to the entire document and claims.) As shown in FIG. 6, an annular encoder 20 is fixedly attached to the entire circumference. The encoder 20 is made of a permanent magnet such as a rubber magnet or a plastic magnet, and is magnetized in the axial direction. The magnetization direction is changed alternately and at equal intervals in the circumferential direction. Therefore, the south pole and the north pole are alternately arranged at equal intervals in the circumferential direction on the inner side surface in the axial direction of the encoder 20, which is the detected surface. The detection surface of the sensor is opposed to the detection surface of such an encoder 20 so that the rotational speed of the wheel rotating together with the hub 3 can be measured. Then, the measured signal representing the rotational speed of the wheel is used to control a vehicle travel stabilization device such as an anti-lock brake system (ABS) or a traction control system (TCS). The slinger 13 for mounting the encoder 20 is made of a magnetic metal so that the slinger 13 has a function as a back yoke, and the strength (density) of the magnetic flux entering and exiting from the detection surface of the encoder 20. ) Is secured.

  By the way, the inner peripheral surface of the cylindrical portion 15 and the outer peripheral surface of the end portion of the hub 3 are simply fixed by fitting the cylindrical portion 15 of the slinger 13 constituting the combined seal ring 10 to the end portion of the hub 3. It is not always possible to ensure a sufficient sealing property of the mating surface. That is, even when the cylindrical portion 15 of the slinger 13 is externally fitted to the end portion of the hub 3, it is inevitable that a minute gap exists in the fitting portion, and moisture that has entered the minute gap is unavoidable. When the volume of the part increases due to corrosion of at least one of the two peripheral surfaces, the minute gap expands, and moisture may enter the annular space 8 through the expanded clearance. There is. The intrusion of moisture into the annular space 8 is not preferable because it causes a decrease in durability of the hub unit due to deterioration of grease.

  As a structure for preventing a decrease in durability of the hub unit 1 due to such a cause, a structure described in Patent Document 2 is known. In the case of this improved conventional structure, as shown in FIGS. 7 to 8, it is attached and fixed to the inner peripheral surface of the curved surface portion 17a of the slinger 13a and the inner surface in the axial direction of the ring portion 16a of the slinger 13a. The gap 22 existing between the inner peripheral edge of the encoder 20a and the outer peripheral surface of the inner ring 21 that is externally fitted and fixed to the inner end of the hub body in the axial direction and forms the hub together with the hub body has oil surface adhesion. The adhesive 23 is filled over the entire circumference. According to such an improved structure, the sealing performance of the fitting portion between the cylindrical portion 15a constituting the slinger 13a and the inner ring 21 can be sufficiently ensured over a long period of time.

  However, in the case of the improved structure described above, sufficient care must be taken so that the adhesive 23 does not protrude from the gap 22 during the manufacturing process. This is because if the protruding adhesive adheres to the raceway surface or the surface of the encoder 20a and solidifies, harmful vibrations occur during the operation of the hub unit 1, or the rotational speed detection using the encoder 20a is accurately performed. This is because there is a possibility that it will not be possible.

Patent Document 3 describes a structure in which a seal lip formed on the inner peripheral edge of an encoder made of an elastic material is brought into contact with the outer peripheral surface of a constant velocity joint adjacent to a hub to ensure the sealing performance of the portion. ing. However, such a structure requires a constant velocity joint to be adjacent to the hub. In addition, a sealing lip made of an elastic material mixed with a large amount of magnetic powder may not always ensure a sufficient sealing performance.
In Patent Document 4, a seal ring is locked in a locking groove formed on an inner peripheral surface of a cylindrical portion constituting a slinger, and a fitting portion between the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the hub. The structure which secures the sealing performance of is described. However, since the thickness dimension of the metal plate which comprises a slinger is very small, it is very difficult to ensure a required sealing performance while ensuring the strength of this slinger.

JP 2008-233110 A JP 2009-185965 A JP 2007-187318 A JP 2008-303907 A

  In view of the circumstances as described above, the present invention has a practical structure, is less prone to problems due to the sticking out of an adhesive at the time of manufacture, and the cylindrical portion constituting the slinger and the circumferential surface of the rotating raceway The present invention has been invented to realize a structure that can sufficiently ensure the sealing performance of the fitting portion over a long period of time.

Both the encoder and with the combination seal ring hub unit of the present invention, like the conventional structure described with reference to FIG 5-6 above, the rotating side raceway and the stationary side raceway ring, and a plurality of rolling elements, a combination seal A ring and an encoder are provided.
Of these, the rotation-side raceway and the stationary-side raceway are arranged concentrically with each other.
Each of the rolling elements is rotatably provided between a rotation-side track and a stationary-side track provided on the circumferential surfaces of the rotation-side raceway and the stationary-side raceway facing each other.
Moreover, the combination seal ring is intended for closing an end opening of the annular space existing between the adjacent peripheral surfaces facing each other with the rotating bearing ring and the stationary side raceway ring, slinger the first seal It consists of a ring. Of these, the slinger is fitted and fixed to a part of the peripheral surface of the rotating raceway facing the peripheral surface of the stationary raceway, and the cross section L is obtained by bending a magnetic metal plate. An overall shape is formed in an annular shape, and a cylindrical portion, an annular portion bent radially from the axial end edge of the cylindrical portion toward the stationary raceway, and the cylindrical portion and the annular portion It consists of a curved surface portion having a circular arc cross section existing in the continuous portion. On the other hand, the first seal ring is a part of the stationary side race ring which is fitted and fixed to a portion facing the slinger, and the core metal fitted and fixed to the stationary side race ring, and the core And a plurality of seal lips each having a base end supported by gold. And the front-end | tip part of each of these seal lips is slidably contacted with the surface of the said slinger over the perimeter.
The encoder is formed in a ring shape as a whole, and is fixedly attached to and fixed to the axial inner surface of the annular portion constituting the slinger by the concentricity with the slinger. It is changed alternately in the circumferential direction.

In particular, in the encoder and the hub unit with the combined seal ring of the present invention, the encoder is made of a plastic magnet obtained by mixing ferromagnetic powder in a synthetic resin having thermoplasticity. Then, an annular second seal ring made of an elastic material is locked to the peripheral edge of the encoder, and the second seal ring is present between the curved surface portion of the slinger and the peripheral surface of the rotating raceway. The opening of the gap is covered around the entire circumference.

More specifically, as in the invention described in claim 1 , the radial direction is formed on a part of the inner side surface in the axial direction of the encoder and on the end portion where the cylindrical portion of the slinger is installed in the radial direction. The second seal between the step surface facing the surface and the holding portion formed by melting and deforming a portion closer to the edge with respect to the radial direction than the step surface at the remaining portion of the inner surface in the axial direction of the encoder Hold the outer half of the ring in the axial direction. Then, the second seal ring is locked to the peripheral edge of the encoder, and the peripheral edge of the second seal ring in the axial direction on the inner circumferential side of the rotary side raceway is elastic over the entire circumference. Abut.

Alternatively, as in the invention described in claim 2 , it is formed in a state of projecting inward in the axial direction from a plurality of circumferential positions on the step surface facing inward in the axial direction, formed on a part of the peripheral edge of the encoder. The plurality of locking pin portions thus inserted are inserted into through-holes formed in mutually matching portions of the second seal ring and the annular holding plate superimposed on the inner side surface in the axial direction of the second seal ring. . Further, the restraining portion formed at the tip portion of each locking pin portion and protruding from the axial inner side surface of the restraining plate prevents the restraining plate from being displaced in the direction away from the step surface. Then, by clamping the radial piece halves of the second sealing ring between these clamping plates and the stepped surface, engage the second seal ring on the periphery of the encoder, the second seal ring The peripheral edge on the other end side in the radial direction is elastically brought into contact with the circumferential surface of the rotating raceway over the entire circumference.

  According to the encoder unit and the hub unit with the combined seal ring of the present invention configured as described above, it is difficult to cause problems due to the sticking out of the adhesive at the time of manufacture, and the cylindrical portion and the rotating side raceway ring constituting the slinger are not generated. It is possible to realize a practical structure that can sufficiently ensure the sealing performance of the fitting portion with the peripheral surface over a long period of time.

The partial expanded sectional view of the combination seal ring which assembled | attached the encoder which shows the 1st example of the reference example regarding this invention. The figure equivalent to the lower right part of FIG. 1 which shows the 2nd-4th example. The figure equivalent to the lower right part of FIG. 1 which shows the 1st example of embodiment of this invention . The figure equivalent to the lower right part of FIG. 1 which shows the 2nd example. Sectional drawing which shows an example of the hub unit with a conventionally known encoder and a combination seal ring. The X section enlarged view of FIG. The fragmentary sectional view which shows the 2nd example of the conventional structure which improved the sealing performance. The Y section enlarged view of FIG.

[First example of reference example ]
FIG. 1 shows a first example of a reference example related to the present invention. The feature of this reference example is that the second seal ring 24 is locked to the inner peripheral edge of the encoder 20b attached and fixed to the inner surface in the axial direction of the annular portion 16a of the slinger 13a constituting the combined seal ring 10a . The second seal ring 24 is used to block the gap between the inner peripheral edge of the encoder 20b and the outer peripheral surface of the inner ring 21 constituting the hub, and the second seal ring 24 is locked therefor. . Construction and operation of the other parts is basically because it is similar to the conventional structure shown in FIGS. 5-8 described above, the illustration and description overlapping, and omitted or simplified, less, characteristics of the present embodiment The description will focus on the parts and the parts that have not been described previously.

  The encoder 20b is made of a plastic magnet formed by mixing a ferromagnetic powder in a thermoplastic synthetic resin. The slinger 13a is made by pressing a ferritic stainless steel plate such as SUS430, which is a magnetic metal plate. The annular portion 16a and the encoder 20b are attached and fixed with an adhesive. As it is, the adhesiveness of the stainless steel plate is not good. Therefore, in order to bond the annular portion 16a and the encoder 20b, as described in Patent Document 1, minute irregularities are formed on the annular portion 16a. The adhesive is applied to the concave and convex portions, and the encoder 20b is injection-molded with the adhesive applied to the ring portion 16a being semi-cured, and the adhesive is secondarily heated to be cured. By proceeding, the adhesive strength between the encoder 20b and the annular portion 16a is increased. Since this point is described in Patent Document 1 and is not the gist of the present invention, more detailed explanation is omitted. The composition of the encoder 20b (magnetic powder mixing ratio, type of synthetic resin) is described in Patent Document 2 and will not be described in detail.

In the case of this reference example, the second seal ring 24 made of an elastic material, such as an O-ring, is engaged with the inner peripheral edge of the encoder 20b. For this reason, in the case of this reference example, a step surface 25 facing inward in the axial direction is formed in the axially intermediate portion of the inner peripheral edge of the encoder 20b. In addition, in the remaining portion of the inner peripheral edge of the encoder 20b, a restraining portion 26 is formed over the entire circumference or intermittently in the circumferential direction at a portion closer to the inner side in the axial direction than the step surface 25. That is, it is only necessary that the restraining portion 26 restrains the second seal ring 24, and it is not always necessary to form the restraining portion 26 over the entire circumference. For example, considering the ease of formation, a structure having slits (formed intermittently) at a plurality of locations in the circumferential direction is advantageous.

In any case, in order to form the restraining portion 26, a short cylindrical or semi-cylindrical protruding wall 27 is formed on the radially inner end of the axial inner side surface of the encoder 20b during the injection molding of the encoder 20b. It is formed intermittently in the circumferential direction or in the circumferential direction, and the protruding wall 27 is melted and deformed inward in the radial direction while being heated, thereby forming the restraining portion 26. Then, the second seal ring 24 is locked in a locking groove 28 surrounded on three sides by the holding portion 26, the stepped surface 25, and the inner peripheral edge of the encoder 20. The locking operation is performed at the same time when the protruding wall 27 is used as the holding portion 26. Since the diameter of the cross section of the second seal ring 24 is larger than the depth in the radial direction of the locking groove 28, the inner diameter side end of the second seal ring 24 has a diameter larger than the opening of the locking groove 28. It becomes a state protruding inward in the direction. In the example shown in the figure, a concave groove 29 is formed around the entire periphery of the protruding wall 27. The concave groove 29 facilitates entry of a welder used when the protruding wall 27 is heated to form the holding portion 26, and the detected surface of the encoder 20 b is not damaged, and the holding portion 26 is not damaged. It is provided for processing.

As described above, when the slinger 13a in which the encoder 20b with the second seal ring 24 locked to the inner peripheral edge is attached and fixed to the inner side surface in the axial direction of the annular ring portion 16a is externally fitted to the inner ring 21 constituting the hub. The second seal ring 24 is elastically compressed between the outer peripheral surface of the inner ring 21 and the bottom surface of the locking groove 28. And the opening part of the clearance gap 22 which exists between the curved surface part 17a of the said slinger 13a and the outer peripheral surface of the said inner ring | wheel 21 is plugged up by the said 2nd seal ring 24 over the perimeter. As a result, the sealing performance of the fitting portion between the cylindrical portion 15a constituting the slinger 13a and the outer peripheral surface of the inner ring 21 can be sufficiently ensured over a long period of time.

[Second to fourth examples of reference examples ]
FIG. 2 shows second to fourth examples of reference examples related to the present invention. In each of these examples, the shapes of the second seal rings 24a to 24c locked to the inner peripheral edge of the encoder 20b are different from those of the first example of the reference example described above. First, in the case of the second example shown in (A), the second seal ring 24a having a semicircular cross-sectional shape and a convex surface on the inner peripheral surface side is used. In the case of the third example shown in (B), the second seal ring 24b having a sharp inner peripheral side and a wedge-shaped cross section is used. Further, in the case of the third example shown in (C), the second seal ring 24 c having a “<” shape in cross section is used. Since the configurations and operations other than the differences in the shapes of the second seal rings 24a to 24c are the same as those of the first example of the reference example described above, overlapping illustrations and descriptions are omitted.

The second seal ring 24c of the fourth example of the reference example shown in FIG. 2C needs to use an elastomeric material such as rubber that is generally used as a seal ring. On the other hand, the second seal rings 24, 24a and 24b of the first to third examples of the reference example shown in FIGS. 1 and 2A and 2B are of course made of the above-mentioned elastomer material. A sponge-like material such as urethane foam can also be used.

[ First example of embodiment]
FIG. 3 shows a first example of an embodiment of the present invention corresponding to claim 1 . In the case of this example, a step surface 25a facing inward in the radial direction is formed at a portion near the radially inner end of the axial inner side surface of the encoder 20b. Further, the cylindrical or partially cylindrical protruding wall 27a provided at the radially inner end of the axially inner side surface is melted and deformed radially outward to form the restraining portion 26a. And the base 30 which comprises the axial direction outer half part of the 2nd seal ring 24d is clamped between this suppressing part 26a and the said level | step difference surface 25a. The second seal ring 24d includes a base 30 having a quadrangular cross-sectional shape, and a seal lip 31 projecting radially inward from the axial inner end of the inner peripheral surface of the base 30. As described above, with the base 30 supported and fixed to the inner peripheral edge of the encoder 20b, the tip edge (inner peripheral edge) of the seal lip 31 is placed on the outer peripheral surface of the inner ring 21 constituting the hub. It is in contact over the entire circumference. In the case of this example, the protruding wall 27a is melted and deformed radially outward to form the holding portion 26a. The portion 26a can be formed with high accuracy. Further, when assembling the structure of this example, after the protruding wall 27a is melted and deformed to form the holding portion 26a, the base portion 30 is inserted into the locking groove 28a between the holding portion 26a and the stepped surface 25a. It can also be fitted. Since the configuration and operation other than the difference in the shape of the second seal ring 24d and its support structure are the same as those in the first example of the reference example described above, overlapping illustration and description are omitted.

In the case of the first example and the reference example of the embodiment described above, the engagement walls 28, 28a are formed by heating and melting the protruding walls 27, 27a, and the inner diameter side portion of the encoder 20b. It does not matter before and after the operation of installing the second seal rings 24, 24a, 24b, 24c, 24d. For example, the second sealing rings 24, 24a, 24b, 24c, and 24d may be mounted after the protruding walls 27 and 27a are melted and deformed in advance to form the locking grooves 28 and 28a. Alternatively, the second seal rings 24, 24a, 24b, 24c, 24d are arranged on the inner diameter side portion of the encoder 20b, and then the protruding walls 27, 27a are heated and melted to form the locking grooves 28, 28a. You may do it.

[ Second Example of Embodiment]
FIG. 4 shows a second example of the embodiment of the invention corresponding to claim 2 . In the case of this example, a step surface 25b facing inward in the axial direction is formed on the inner peripheral edge portion of the encoder 20b. And the latching pin part 32 is formed in the circumferential direction multiple places of this level | step difference surface 25b in the state which protrudes in an axial direction inner side. These locking pin portions 32 are formed in through holes formed in the mutually matching portions of the second seal ring 24e and the annular holding plate 33 superimposed on the inner side surface in the axial direction of the second seal ring 24e. It is inserted. Furthermore, the portion protruding from the inner side surface in the axial direction of the holding plate 33 at the tip of each locking pin portion 32 is heated and melted and deformed in the direction in which the outer diameter increases to form a hook-like holding portion 26b. Then, the pressing section 26b and between the stepped surface 25b, to clamp the holding plate 33 the said second sealing ring 24e, locking the second seal ring 24e to the inner peripheral edge of the encoder 20b doing. Further, the inner peripheral edge of the second seal ring 24e is brought into contact with the outer peripheral surface of the inner ring 21 constituting the hub over the entire periphery.

In the case of the structure of this example, the force for holding down the holding plate 33 cannot be sufficiently increased only by the holding portion 26b formed at the tip of each locking pin portion 32, and the second seal ring 24e. There is a possibility that the sealing performance of the contact portion between the stepped surface 25b and the stepped surface 25b cannot be sufficiently ensured. In consideration of such points, in the case of the present example, the outer peripheral edge of the second seal ring 24e is also formed into a thin lip shape, and this outer peripheral edge extends over a part of the inner peripheral edge of the encoder 20b. The sealing property between the encoder 20b and the second seal ring 24e is ensured by contact. Since the configuration and operation other than the difference in the shape of the second seal ring 24e and its support structure are the same as those in the first example of the reference example described above, overlapping illustration and description are omitted.

  Each example shown in the figure shows the case where the present invention is applied to an inner ring rotating type hub unit, but the present invention can also be applied to an outer ring rotating type hub unit. In this case, the structure of each part is reversed inside and outside with respect to the radial direction as compared with the examples in the drawings.

DESCRIPTION OF SYMBOLS 1 Hub unit 2 Outer ring 3 Hub 4 Outer ring raceway 5 Inner ring raceway 6 Ball 7, 7a Cage 8 Annular space 9 Seal ring 10, 10a Combination seal ring 11 Core metal 12 Seal lip 13, 13a, 13b Slinger 14, 14a First seal Ring 15, 15a, 15b Cylindrical part 16, 16a, 16b Circular ring part 17, 17a, 17b Curved part 18, 18a Metal core 19, 19a Seal lip 20, 20a, 20b Encoder 21 Inner ring 22 Gap 23 Adhesive 24, 24a, 24b, 24c, 24d, 24e Second seal ring 25, 25a, 25b Stepped surface 26, 26a, 26b Holding part 27, 27a Projecting wall 28, 28a Locking groove 29 Recessed groove 30 Base 31 Seal lip 32 Locking pin part 33 Holding plate

Claims (2)

The rotating side raceway and the stationary side raceway arranged concentrically with each other, and the rotation side raceway and the stationary side raceway between the rotation side raceway and the stationary side raceway respectively provided on the mutually opposing circumferential surfaces. A plurality of rolling elements provided in a freely movable manner, and a slinger and a first that close an end opening of an annular space existing between mutually opposing circumferential surfaces of the rotating side raceway and the stationary side raceway A combined seal ring composed of a seal ring and an encoder that is formed in a ring shape and has the magnetic characteristics of the inner surface in the axial direction changed alternately with respect to the circumferential direction. in which a part of the peripheral surface of the wheel is fitted and fixed to a portion facing the peripheral surface of the stationary side raceway ring, a magnetic metal plate made constructed annularly as a whole by cross section L-shaped, cylindrical Part and the axial end edge of the cylindrical part It consists of a circular ring portion which is bent radially towards the side raceway ring, and a circular arc cross sectional shape of the curved portion existing in the continuous portion of these cylindrical portion and the circular ring portion, the first seal ring, said stationary A part of the side race ring is fitted and fixed to a portion facing the slinger, and a base metal fitted and fixed to the stationary side race ring and each base end supported by the core metal A plurality of seal lips, and the end portions of the seal lips are in sliding contact with the surface of the slinger over the entire circumference, and the encoder is an inner surface in the axial direction of an annular portion constituting the slinger In the hub unit with an encoder and a combination seal ring that are fixedly attached to the slinger concentrically,
Wherein the encoder is made of plastic magnet, and the step surface which faces axially the radial cylindrical portion formed on the installed end portion close of the slinger with respect to the radial direction part of the side surface of the encoder, The outer half of the annular second seal ring made of an elastic material is interposed between the remaining portion of the inner side surface of the encoder in the axial direction and the holding portion formed nearer to the edge with respect to the radial direction than the stepped surface. The second seal ring is locked to the peripheral edge of the encoder, and the peripheral edge on the inner end side in the axial direction of the second seal ring is placed around the circumference of the rotating raceway. The opening of the gap existing between the curved surface portion of the slinger and the peripheral surface of the rotating side raceway is covered and closed all over by being elastically contacted. Hub unit with encoder and combination seal ring. The rotating side raceway and the stationary side raceway arranged concentrically with each other, and the rotation side raceway and the stationary side raceway between the rotation side raceway and the stationary side raceway respectively provided on the mutually opposing circumferential surfaces. A plurality of rolling elements provided in a freely movable manner, and a slinger and a first that close an end opening of an annular space existing between mutually opposing circumferential surfaces of the rotating side raceway and the stationary side raceway A combined seal ring composed of a seal ring and an encoder that is formed in a ring shape and has the magnetic characteristics of the inner surface in the axial direction changed alternately with respect to the circumferential direction. Fitted to and fixed to a part of the circumferential surface of the ring that faces the circumferential surface of the stationary-side raceway ring, is made of a magnetic metal plate that is L-shaped in cross section and is configured in an annular shape as a whole, and a cylindrical portion And the static edge from the axial end edge of the cylindrical portion. The first seal ring is composed of an annular portion bent in the radial direction toward the side raceway and a curved surface portion having an arcuate cross section existing in a continuous portion of the cylindrical portion and the annular portion. A part of the side race ring is fitted and fixed to a portion facing the slinger, and a base metal fitted and fixed to the stationary side race ring and each base end supported by the core metal A plurality of seal lips, and the end portions of the seal lips are in sliding contact with the surface of the slinger over the entire circumference, and the encoder is an inner surface in the axial direction of an annular portion constituting the slinger In the hub unit with an encoder and a combination seal ring that are fixedly attached to the slinger concentrically,
The encoder is made of a plastic magnet, and a plurality of locking pin portions are axially inward at a plurality of locations in the circumferential direction on a step surface facing inward in the axial direction formed on a part of the peripheral edge of the encoder. is formed in a state protruding, the locking pin part, together in the second sealing ring and clamping plates annular superimposed axially inner surface side of the second seal ring annularly made of an elastic material It is inserted through a through-hole formed in the matching portion, and a restraining portion is formed at a tip portion of each locking pin portion that protrudes from the inner side surface in the axial direction of the restraining plate. The restraining plate is prevented from being displaced in a direction away from the step surface, and the second seal ring is clamped by sandwiching the radial half of the second seal ring between the restraining plate and the step surface. Locks to the peripheral edge of the encoder The circumferential edge of the second seal ring on the other end side in the radial direction is elastically brought into contact with the circumferential surface of the rotating side raceway over the entire circumference, so that the curved surface portion of the slinger and the rotating side raceway are in contact with each other. A hub unit with an encoder and a combined seal ring, characterized in that the opening of the gap existing between the peripheral surface and the entire circumference is closed.

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