JP2009197962A - Bearing unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing unit having a seal ring capable of preventing movement of slinger and a seal core bar and creep deformation, thereby preventing permeation of water. <P>SOLUTION: An annularly communicated concave part 5a having a semi-circular section is formed on a fit face 5b of an inner ring element 5. A centerline n1 passing a circle center of the concave part 5a is slightly inclined against a centerline m in an axial direction of a bearing unit 20. A slinger 36 includes a cylinder part 36a, on which a through-hole 36c is provided, and an annular part 36b, is formed into an approximate L-shaped section, and mounted by fitting the cylinder part 36a with the fit face 5b of the inner ring element 5. After the slinger 36 is fixed to the fit face 5b, resin is poured to the concave part 5a from the through-hole 36c, and the through-hole 36c and the concave part 5a are molded as an integral die, so as to form a solidified member 40. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bearing unit that is attached to a suspension system of an automobile and other mechanical devices and rotatably supports a rotating shaft.

  For example, a bearing unit that is attached to a suspension device of an automobile and rotatably supports a wheel is configured as shown in FIG. A bearing unit 10 shown in FIG. 11 mainly includes an outer ring 1, an inner ring 2, and a plurality of rolling elements 3, 3, 3,. Of these, the inner ring 2 is formed by combining an inner ring body 4 and an inner ring element 5. Further, two rows of outer ring raceways 6 and 6 are formed on the inner peripheral surface of the outer ring 1, and two rows of inner ring raceways 7 and 7 are formed on the outer peripheral surface of the inner ring 2 so as to face the outer ring raceways 6 and 6. Is formed. Each rolling element 3 is rotatably provided in two annular raceways composed of outer ring raceways 6 and 6 and inner ring raceways 7 and 7 while being held by a plurality of holders (not shown). .

In the bearing unit 10, grease is sealed in the internal space 13 in which each rolling element 3 is installed, and the rolling surface of each rolling element 3 and the rolling contact portion between the outer ring raceways 6 and 6 and the inner ring raceways 7 and 7. Is lubricated.
Further, a seal 14 and a seal 18 are provided between the inner peripheral surface of the outer ring 1 and the outer peripheral surface of the inner ring element 5 opposed thereto. These seals 14 and 18 block the opening at both ends of the internal space 13 to prevent grease from leaking to the outside and prevent foreign substances such as rainwater, mud and dust from entering the inside. Yes.

Among these, as the seal 14, a seal ring provided with a seal material and a slinger with which the seal material is in sliding contact and having a box-shaped cross section (combination seal ring) is highly resistant to severe vehicle conditions such as the wheel portion of a vehicle. Widely used as a performance seal. Examples of such a seal 14 are shown in FIGS. 12 (a) and 12 (b). For convenience, the seal shown in FIG. 12A is the seal 14a, and the seal shown in FIG. 12B is the seal 14b.
The entire seal 14 a is formed in an annular shape, and is formed by combining a seal core 15, a slinger 16, and a seal material 17. Here, the seal metal core 15 and the seal material 17 fixed to the seal metal core 15 are collectively referred to as a seal ring, and the slinger 16 with which the seal material 17 of the seal ring is in sliding contact is combined with the seal ring. It is called a combination seal ring.
Among these, the seal core 15 is formed so as to be bent inward along the radial direction from one cylindrical end of the cylindrical portion 15a fixed to the inner peripheral surface of the outer ring 1 and the annular end of the cylindrical portion 15a. An annular ring portion 15b, and the cross section is L-shaped.
The slinger 16 has a cylindrical cylindrical portion 16a fixed to the outer peripheral surface of the inner ring element 5, and an annular shape formed so as to be bent outward along the radial direction from one annular end of the cylindrical portion 16a. The cross section is formed in an L shape.
The sealing material 17 is made of, for example, an elastic material such as rubber, and its base end is fixed to the seal core 15 and three seal lips 17a, 17b, and 17c are formed so as to extend from the base end. Has been. The seal lip 17a is formed so as to protrude toward the slinger 16, and the tip thereof is in sliding contact with the side surface of the annular portion 16b of the slinger 16 over the entire circumference. The tips of the remaining seal lips 17b and 17c are in sliding contact with the outer peripheral surface of the cylindrical portion 16a of the slinger 16 over the entire circumference.

The seal 14b, like the seal 14a, is formed in an annular shape as a whole, and is formed by combining a seal core 23, a slinger 22, and seal materials 25 and 26. Basically, the seal 14b differs from the seal 14a in the configuration of the sealing materials 25 and 26, but the other configuration is the same as that of the seal 14a.
The seal core 23 has a cylindrical portion 23a and an annular portion 23b, and the slinger 22 has a cylindrical portion 22a and an annular portion 22b, both of which have an L-shaped cross section.
The sealing materials 25 and 26 are made of an elastic material such as rubber. The sealing material 25 has a base end fixed to the seal core 23 and a seal lip 25a is formed to extend from the base end. Has been. The tip of the seal lip 25a is in sliding contact with the side surface of the cylindrical portion 22a of the slinger 22 over the entire circumference. The sealing material 26 has a base end portion fixed to the slinger 22, and seal lips 26 a and 26 b are formed so as to extend from the base end portion. The tip of the seal lip 26 a is in sliding contact with the outer peripheral surface of the cylindrical portion 23 a of the seal core 23, and the tip of the seal lip 26 b is in sliding contact with the side surface of the annular portion 23 b of the seal core 23. Therefore, in the seal 14b, the seal metal core 23 and the slinger 22 have a function as a seal metal core to which the seal materials 25 and 26 are attached and a function as a slinger with which the seal material is slidably contacted. ing.

In addition to the above-described seals, slinger and seal metal are manufactured by being press-formed from cold-rolled steel plates such as SPCC or stainless steel plates for reasons such as ease of processing and low cost. There are many cases. The tolerance width of the diameter direction of the cylindrical portion of the slinger is about 0.1 mm. If the tolerance generated in the housing such as the hub is adjusted to this value, the variation in fitting allowance, which is the sum of all the processing tolerances, is increased when the seal ring is press-fitted into the inner ring element.
If the fitting allowance is too large, the slinger and the seal core are thin and may be deformed. For example, as shown in FIG. 12C, the annular portion 16b of the slinger 16 is deformed into a taper shape. At this time, the tightening margin of the seal lip 17a also changes and the elastic deformation amount also changes, which may adversely affect the waterproof performance of the seal ring.
Therefore, in many cases, the maximum fitting allowance of the slinger and the seal metal core is set from the tightening margin limit of the seal lip, and the minimum fitting allowance is determined by subtracting the machining tolerance from the value. However, when the actual fitting allowance is close to the minimum fitting allowance, the amount of elastic deformation of the slinger and the seal core is not so large, and the fitting force is not so large. In this case, when a large force is applied to the seal ring, the slinger and the seal metal core may move, thereby changing the tightening margin of the seal lip or deforming the seal lip.
Further, when the inner ring and the outer ring are slightly deformed by passing the rolling element, creep deformation occurs when the value is close to the above-described minimum fitting allowance, and the slinger and the seal metal core move due to this.
When the creeping deformation or movement of the slinger / seal core as described above, and the deformation / tightening change of the seal lip as a result, a gap is generated, the waterproof performance is deteriorated, and water is flooded.

By the way, the following techniques have been proposed as a structure for preventing the movement of the slinger of the seal.
In Patent Document 1, a groove is provided in the inner ring, and on the other hand, a slinger is formed with a locking portion that locks in the groove to prevent the movement of the slinger.

JP 2001-215232 A

  However, even if the movement prevention structure disclosed in Patent Document 1 is adopted, a sufficient effect cannot be expected depending on the size of the fitting allowance actually generated due to the processing tolerance. In other words, as long as there is a problem of variation in fitting allowance due to processing tolerances, there is a risk of movement of the slinger or seal metal core due to this and water intrusion due thereto.

  The present invention has been made in view of the above circumstances, and in consideration of the problem of variation in fitting allowance due to processing tolerances, prevents the movement and creep deformation of slinger and seal core metal, and consequently water. An object of the present invention is to provide a bearing unit having a seal ring that can prevent intrusion.

  In order to achieve the object, the bearing unit according to claim 1 has an outer ring having a raceway surface on an inner peripheral surface, a raceway surface on an outer peripheral surface, and is formed so as to be able to support a rotating shaft inside thereof. Formed by an inner ring, a plurality of rolling elements rotatably arranged between a raceway surface of the outer ring and a raceway surface of the inner ring, the inner peripheral surface of the outer ring, and the outer peripheral surface of the inner ring. A seal provided so as to close the opening of the space, and the seal has an annular shape so that it is bent inward or outward along the radial direction from one end of the cylindrical portion. An L-shaped member having an annular portion formed, having a substantially L-shaped cross section, and attached by fitting the cylindrical portion to the inner peripheral surface of the outer ring or the outer peripheral surface of the inner ring. In front of the outer peripheral surface or inner peripheral surface A concave portion covered with the cylindrical portion is provided at the mounting position of the cylindrical portion, and a through hole is provided in the cylindrical portion at a position overlapping the concave portion, and the through hole and the concave portion extend from the through hole to the concave portion. A solidified member injected into the recess and solidified is provided.

  In the first aspect of the invention, the L-shaped member is solidified integrally from the through hole of the L-shaped member to the recess formed on the inner ring or outer ring fitting surface (the outer peripheral surface of the inner ring or the inner peripheral surface of the outer ring). Since the solidifying member is provided, the solidifying member in the concave portion of the fitting surface is also engaged with the through hole of the L-shaped member, and the concave portion and the L-shaped member are integrally coupled via the solidifying member. Therefore, even if the L-shaped member is press-molded, it cannot move from a predetermined position on the fitting surface regardless of the processing tolerance, and creep deformation hardly occurs. That is, after the L-shaped member is attached to the inner ring or the outer ring, the solidified member is injected and solidified into the above-described through-holes and recesses, so that the through-holes and the recesses are integrated into a single shape while absorbing processing tolerances. It is in a molded state.

In the first aspect of the present invention, as the L-shaped member, specifically, the above-mentioned slinger or seal metal core can be used. For example, in the case of a slinger, the fitting surface to which the cylindrical portion of the slinger is fitted is the outer peripheral surface of the inner ring, and in the case of a seal core, the fitting surface to which the cylindrical portion of the seal core is fitted is the outer ring. This is the inner surface. Further, the slinger may be a slinger as a shield for forming the labyrinth of the labyrinth seal, for example, other than the one described by the seal lip of the sealing material fixed to the seal core. The slinger may also serve as or support a tone ring (tone wheel) of an encoder used for speed detection or the like. Further, the seal metal core is not limited to the one to which the seal material is fixed, but may be the one to which the tone ring (tone wheel) of the encoder is fixed.
In addition, the L-shaped member may function as an independent tone ring or tone wheel in the seal without having a function as a seal. The rotation angle may be measured, or the rotation angle may be measured optically by reflection of light through a slit or a hole.
Further, the shape and number of the recesses are not particularly limited. A plurality of recesses may be formed intermittently along the circumference on the peripheral surface of the annular fitting surface, or only one recess may be provided. Moreover, you may be connected 1 round. Even when they are connected one round, they may be formed in an annular shape, or may be wavy along the peripheral surface of the fitting surface. The longitudinal sectional shape may also be a rectangle, a circle or an ellipse, or a triangle or a pentagon.
The shape of the through hole is not limited and may be one. However, it is preferable to provide a plurality of through holes because the effect of preventing the movement of the slinger is high. In that case, the cylindrical portion of the L-shaped member may be provided intermittently along the circumferential direction, or may be randomly arranged without being along the circumferential direction. When fitting the L-shaped member to the fitting surface, it is necessary to align the position of the through hole with respect to the recess, but it is not necessary to align the center of the through hole with the center of the recess, as long as the resin passes through during molding , It may be slightly off.
Examples of the resin used for molding include thermoplastic resins, rubber, adhesives, and sealing materials.

The bearing unit described in claim 2 is the invention described in claim 1, wherein the recess is formed in an annular shape along the circumferential direction on the outer peripheral surface or the inner peripheral surface, and the solidifying member is It is characterized by being formed in an annular shape along the recess.
In the invention described in claim 2, since the recess is formed in an annular shape and the solidification member is formed in an annular shape along the recess, the solidification member cannot move in the axial direction within the recess. . Therefore, since the movement of the slinger is stopped by the solidifying member, the movement can be surely prevented. Further, when the L-shaped member is fitted to the fitting surface, it is not necessary to align the through hole with respect to the concave portion in the circumferential direction.
Further, since the solidified member is continuously present without being cut between the L-shaped member and the outer peripheral surface of the inner ring or the inner peripheral surface of the outer ring, the waterproof property between the solidified member and the outer ring or the inner ring is improved. Can be increased.
In the invention of claim 2, it is preferable that a plurality of through holes in the cylindrical portion of the L-shaped member are provided along the circumferential direction of the cylindrical portion in accordance with the annular recess.

According to a third aspect of the present invention, there is provided the bearing unit according to the second aspect, wherein the center axis of the annular bottom surface of the concave portion is the inner peripheral surface of the outer ring or the outer peripheral surface of the inner ring where the concave portion is formed. It is characterized by being eccentric with respect to the central axis.
In the invention described in claim 3, the center of the circle formed by the bottom surface of the recess is eccentric with respect to the axial center line of the bearing unit. In other words, the depth of the concave portion is not constant, and when the shallowest position is 0 degree, the depth becomes gradually deeper, becomes deepest at a position of 180 degrees, and when it exceeds 180 degrees, it gradually becomes shallower again toward the position of 0 degree. As you go, the depth of the recess changes. Therefore, since the solidified member molded in the concave portion also has a shape corresponding thereto, the solidified member is less likely to move with respect to the concave portion than when the depth is constant, and the L-shaped member moves through the solidified member. And creep deformation can be further prevented. That is, it is possible to prevent the annular solidified member provided in the annular recess from rotating in the circumferential direction with respect to the recess.

According to a fourth aspect of the present invention, in the bearing unit according to the second aspect, the center axis direction of the annular recess is inclined with respect to the center axis direction of the outer ring or the inner ring where the recess is formed. It is characterized by being.
In the invention described in claim 4, since the center line passing through the circle center of the recess is inclined with respect to the center line in the axial direction of the bearing unit, the center line coincides with the center line. The solidified member is difficult to move with respect to the recess, and as a result, the movement of the L-shaped member in the axial direction and creep deformation can be further prevented through the solidified member.
Also in this case, it is possible to prevent the annular solidified member from rotating and moving along the circumferential direction with respect to the annular recess.

The bearing unit described in claim 5 is characterized in that, in the invention described in claim 2, the width of the annular recess changes depending on the phase position of the outer ring or the inner ring where the recess is formed. To do.
In the invention described in claim 5, since the recess is formed so that the width varies depending on the phase position, the width of the recess is not constant. Therefore, since the solidified member molded in the concave portion also has a shape corresponding thereto, the solidified member hardly moves relative to the concave portion. As a result, movement of the L-shaped member and creep deformation can be further prevented through the solidified member.
Also in this case, it is possible to prevent the annular solidified member from rotating and moving along the circumferential direction with respect to the annular recess.

  In order to achieve the object, the bearing unit according to claim 6 has an outer ring having a raceway surface on an inner peripheral surface, a raceway surface on an outer peripheral surface, and is formed so as to be able to support a rotating shaft inside thereof. Formed by an inner ring, a plurality of rolling elements rotatably arranged between a raceway surface of the outer ring and a raceway surface of the inner ring, the inner peripheral surface of the outer ring, and the outer peripheral surface of the inner ring. A seal provided so as to close an opening of the space, and the seal is formed in an annular shape so as to be bent outward along one radial direction from one end of the cylindrical portion. In a bearing unit provided with a slinger that has an annular portion, a cross-section is formed in an approximately L shape, and an inner peripheral surface of the cylindrical portion is fitted to an outer peripheral surface of the inner ring. In the position where the slinger is provided on the outer peripheral surface of the inner ring, The slinger is formed by molding a resin using an annular slinger mold having an L-shaped cross section and an outer peripheral surface of the inner ring provided with the recess as an integral mold. It is resin, Comprising: The convex part formed using the said recessed part as a type | mold is provided in the internal peripheral surface of the said cylindrical part, It is characterized by the above-mentioned.

In the invention described in claim 6, since the slinger is made of resin that is integrally molded up to the cylindrical portion, the annular portion, and the convex portion, variation in processing tolerance can be suppressed more than press molding. Moreover, since the convex part of the cylindrical part of the slinger is in a state of being engaged with the concave part of the inner ring as it is after molding, the slinger cannot move. Therefore, the slinger does not move relative to the inner ring regardless of the size of the fitting allowance caused by the machining tolerance, and creep deformation hardly occurs.
Here, as the resin used for molding, a non-hydrophilic thermoplastic resin having a melting point not lower than the operating temperature of the bearing unit and not higher than the tempering temperature of the inner ring, such as polycarbonate, polyacetal, polyphenylene sulfide, etc. Is preferred. Since the volume of the resin decreases when the resin is cured, the inner ring is tightened by the resin after molding, that is, the cylindrical portion of the slinger tightens the outer peripheral surface of the inner ring, which is the mating surface. Can be prevented.
In addition, since the thermoplastic resin can be heated and corrected, it can be corrected even if a problem such as “runout” occurs in the slinger.
The shape and number of the recesses are not particularly limited. A plurality of recesses may be formed intermittently along the circumference on the outer peripheral surface of the inner ring, or only one recess may be provided. Moreover, you may be connected 1 round. Even when they are connected one round, they may be formed in an annular shape, or may be wavy along the peripheral surface of the fitting surface. The longitudinal sectional shape may also be a rectangle, a circle or an ellipse, or a triangle or a pentagon.

The bearing unit described in claim 7 is the bearing unit according to claim 6, wherein the recess is formed in an annular shape along a circumferential direction of the outer peripheral surface of the inner ring, and the protrusion is formed along the recess. It is characterized by being formed in an annular shape.
In the invention described in claim 7, since the concave portion is formed in an annular shape and the convex portion is formed in a ring shape along the concave portion, the convex portion cannot move in the axial direction within the concave portion. Therefore, since the movement of the slinger is stopped by the convex portion, the movement can be surely prevented.

The bearing unit described in claim 8 is the bearing unit according to claim 7, wherein the center axis of the annular bottom surface of the recess is eccentric with respect to the center axis of the outer peripheral surface of the inner ring where the recess is formed. It is made into the state which was made.
In the invention described in claim 8, the central axis of the circle formed by the bottom surface of the recess is eccentric with respect to the central axis of the bearing unit on the outer peripheral surface of the inner ring. That is, the depth of the concave portion is not constant. For example, when the shallowest position is 0 degree, the depth becomes gradually deeper, and when the depth is 180 degrees, the depth becomes deeper. The depth of the recess changes as it becomes shallower. Therefore, since the convex part molded in the concave part also has a shape corresponding thereto, it is more difficult to move with respect to the concave part than when the depth is constant, and slinger movement and creep deformation can be further prevented.
In other words, the circumferential movement of the slinger with respect to the inner ring can be reliably prevented.

In the bearing unit described in claim 9, in the invention described in claim 7, the central axial direction of the annular concave portion is inclined with respect to the central axial direction of the inner ring in which the concave portion is formed. It is characterized by that.
In the invention described in claim 9, since the central axis passing through the circular center of the concave portion is inclined with respect to the central axis of the bearing unit, the convex portion is the concave portion as compared with the case where the central axes coincide with each other. As a result, the movement of the slinger and creep deformation can be further prevented.
In other words, the circumferential movement of the slinger with respect to the inner ring can be reliably prevented.

The bearing unit described in claim 10 is characterized in that, in the invention described in claim 7, the width of the annular recess is changed depending on the phase position of the inner ring in which the recess is formed.
In the invention described in claim 10, since the recess is formed so that the width varies depending on the position, the width of the recess is not constant. Therefore, since the convex part molded in the concave part also has a shape corresponding thereto, the convex part is less likely to move relative to the concave part than when the width is constant. As a result, slinger movement and creep deformation can be further prevented.
In other words, the circumferential movement of the slinger with respect to the inner ring can be reliably prevented.

  A bearing unit according to an eleventh aspect is the invention according to any one of the sixth to tenth aspects, in which the cylindrical cylindrical portion and the one end of the cylindrical portion are radially outward from one end. A metal slinger having an annular part formed in an annular shape so as to be bent, and having a cross section formed in an L shape, and the cylindrical part of the resin slinger is inserted into the cylindrical part of the metal slinger. A cylindrical portion of the metal slinger on the outer periphery of the cylindrical portion of the resin slinger in a state where the annular portion of the resin slinger and the annular portion of the metal slinger are in close contact with each other. Is fitted.

  In the invention described in claim 11, since the metal slinger is attached so as to be in close contact with the resin slinger, a metal slinger that is more suitable than the resin slinger in terms of elasticity is used as a seal lip of the sealing material. It can be used as a sliding surface.

According to a twelfth aspect of the present invention, in the invention described in the eleventh aspect, the metal slinger is fixed to the resin slinger with an adhesive.
In the invention described in claim 12, since the metal slinger is fixed to the resin slinger with an adhesive, the metal slinger and the resin slinger do not rotate with respect to each other.

The bearing unit according to claim 13 is the invention according to claim 11 or claim 12, wherein the metal slinger and the resin slinger include a metal slinger and a resin slinger. An uneven structure is provided that meshes with each other so as to restrict relative movement in the circumferential direction.
In the invention described in claim 13, the metal slinger and the resin slinger do not rotate with respect to each other.

According to a fourteenth aspect of the present invention, in the invention described in any one of the eleventh to thirteenth aspects, the metal slinger is a magnetic body, and the resin slinger includes a magnetic material. It is characterized by being magnetized in multiple poles.
In the invention described in claim 14, since the metal slinger is a magnetic material and the resin slinger is magnetized in multiple poles, it can be used as an encoder used for speed detection or the like.

  In any one of claims 1 to 14, each of the outer ring and the inner ring may be a single member or may be composed of a plurality of members. Further, one or a plurality of tracks may be formed by these two members facing each other. Further, the rolling element may be a sphere or a tapered roller. For example, a double-row angular contact ball bearing or a double-row tapered roller bearing can be used as the bearing unit of the present invention.

According to the bearing unit of the first invention of the present invention, the solidified member in the recess formed on the fitting surface of the inner ring or the outer ring engages with the through hole of the L-shaped member, and the recess and the L-shaped member are They are coupled together via a solidifying member. Therefore, even if the L-shaped member is press-molded, it is securely locked to the fitting surface in the recess and the solidified member, so that the fitting is possible regardless of the size of the fitting allowance due to processing tolerances. It cannot move from a predetermined position on the fitting surface with respect to the outer ring or inner ring, and creep deformation hardly occurs. As a result, it is possible to prevent water from entering due to movement or deformation of the L-shaped member.
According to the bearing unit of the second invention of the present invention, the slinger is made of resin that is integrally molded up to the cylindrical portion, the annular portion, and the convex portion, so that variation in processing tolerance is suppressed more than press molding. In addition, since the convex part of the cylindrical part of the slinger is in a state of being engaged with the concave part of the inner ring as it is after molding, the slinger cannot move. Therefore, the slinger does not move relative to the inner ring regardless of the size of the fitting allowance caused by the machining tolerance, and creep deformation hardly occurs. As a result, it is possible to prevent water from entering due to movement or deformation of the L-shaped member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The feature of the present invention resides in the seal, and other configurations and operations are the same as those of the conventional configuration and operations described above. Therefore, the following will mainly refer to the characteristic portions of the present invention. Members that are completely the same as those in FIGS. 11 and 12 will be described using the same reference numerals.

FIG. 1 shows a first embodiment of the first invention of the present invention.
As illustrated, the bearing unit 20 mainly includes an outer ring 1, an inner ring 2, and a plurality of rolling elements 3, 3, 3. Of these, the inner ring 2 is formed by combining an inner ring body 4 and an inner ring element 5. Further, outer ring raceways 6 and 6 are formed on the inner peripheral surface of the outer ring 1, and inner ring raceways 7 and 7 are formed on the outer peripheral surface of the inner ring 2, and each rolling element 3 includes the outer ring raceways 6 and 6 and the inner ring raceway. 7 and 7 are provided so as to be able to roll while being held by a plurality of holders (not shown) in two annular tracks.
When the bearing unit 20 is attached to the suspension device of the vehicle, the outer ring 1 is fixed to the knuckle 8 constituting the suspension device with a bolt or the like, and the mounting flange 9 provided on the inner ring main body 4 is fixed to the wheel with the bolt or the like. . Further, a spline shaft 12 attached to the constant velocity joint 11 is engaged with a spline hole 10 provided in the center portion of the inner ring main body 4. Thereby, the bearing unit 20 supports the wheel rotatably while being fixed to the suspension device.

In the bearing unit 20, grease is sealed in the internal space 13 in which the rolling elements 3 are installed, and the rolling contact surfaces of the rolling elements 3 and the rolling contact portions between the outer ring raceways 6 and 6 and the inner ring raceways 7 and 7. Is lubricated.
Further, a seal 30 is provided between the inner peripheral surface of the end of the outer ring 1 on the vehicle side and the outer peripheral surface of the inner ring element 5 facing this. On the other hand, a seal 18 is provided between the inner peripheral surface of the end of the outer ring 1 on the wheel side and the outer peripheral surface of the inner ring main body 4 facing this. These seals 30 and 18 block the openings at both ends of the internal space 13 to prevent grease from leaking to the outside and prevent foreign substances such as rainwater, mud and dust from entering the inside. Yes.

  The seal 30 is shown in FIG. In this embodiment, the seal 30b shown in FIG. 2B can also be applied as a seal. The seal cores and seal materials of the seals 30 and 30b are the same as those of the conventional seal cores 15 and 23 and seal members 17, 25 and 26 shown in FIGS. 12 (a) and 12 (b). Is attached. The following embodiment can be applied to both the slinger 36 of FIG. 2A and the slinger 32 of FIG. 2B. Hereinafter, the slinger 36 will be described as an example.

In the present embodiment, as shown in FIG. 3, a recess 5 a is formed in the central portion of the fitting surface 5 b with the seal 30 provided on the outer peripheral surface of the inner ring element 5 of the inner ring 2. The recess 5a is a groove having a semicircular cross section and connected in an annular shape along the fitting surface 5b. As shown in FIG. 3 (a), the center line (center axis) n1 passing through the circle center of the recess 5a is formed to be slightly inclined with respect to the center line (center axis) m in the axial direction of the bearing unit 20. Has been. In other words, the locus of the circle drawn by the recess 5a is on a surface that is slightly inclined with respect to the surface orthogonal to the axial center line of the inner ring element 5 (the outer peripheral surface thereof). The tilt angle must be within the following conditions. That is, since the center line of the cylindrical portion 36a of the slinger 36 in which the through hole 36c communicating with the recess 5a is formed coincides with the center line of the inner ring element 5, the through hole 36c and the recess 5a overlap each other. The recess 5a needs to be within the range along the axial direction of the cylindrical portion 36a of the slinger 36, and the seal lips 17b and 17c of the cylindrical portion 36a are within the range along the axial direction of the cylindrical portion 36a. It is necessary to be within the range excluding the sliding contact portion.
The seal lips 17b and 17c need to be in contact with the outer peripheral surface of the cylindrical portion 36a of the slinger 36 without contacting the through hole 36c and the solidifying member 40 solidified therein.
Accordingly, it is possible to incline the center line of the recess 5a with respect to the center line of the inner ring element 5 within a range where the recess 5a is within a range excluding a portion where the seal lips 17b and 17c of the cylindrical portion 36a are in sliding contact.

The slinger 36 has a cylindrical cylindrical portion 36a and an annular portion 36b formed in an annular shape so as to be bent outward from one end of the cylindrical portion 36a in the radial direction, as in the conventional case. The cylindrical portion 36a is fitted to the fitting surface 5b (outer peripheral surface) of the inner ring element 5 and attached.
A plurality of through holes 36c are formed in the cylindrical portion 36a so as to overlap the concave portion 5a. The cylindrical portion 36a is attached to the fitting surface 5b so as to straddle the concave portion 5a in the axial direction and the through hole 36c overlaps the concave portion 5a. That is, the cylindrical portion 36a covers the concave portion 5a, and a through hole 36c is provided in a portion that covers the concave portion 5a of the cylindrical portion 36a and overlaps the concave portion 5a. As shown in FIG. 2A, since the seal lips 17b and 17c of the sealing material 17 are in sliding contact with the cylindrical portion 36a of the slinger 36, the through hole 36c is provided at a position different from these sliding contact positions. . Further, when the slinger 36 is produced from a metal plate by press molding, the blank for the slinger is removed at the same time as the hole for the through hole 36c is punched, and then formed into an L shape by burring.
After fixing the slinger 36 to the fitting surface 5b, the resin is poured (injected) into the recess 5a from the through hole 36c, and the through hole 36c and the recess 5a are molded as an integral mold and solidified to be solidified. A member 40 is formed. The resin flowed from the plurality of through holes 36c is integrated in the recess 5a, so that the solidifying member 40 is formed to be connected annularly along the recess 5a. In the through hole 36c, as shown in FIGS. 2 and 3, the solidified member 40 is formed so that the resin rises on the upper surface of the through hole 36c.
Examples of the resin used here include thermoplastic resins, rubbers, and adhesives, but rubbers that cure at room temperature and resins for sealing materials are particularly preferable. This is because there is not much decrease in volume after curing, and there is little generation of a gap between the periphery of the through hole 36c or the inner peripheral surface of the cylindrical portion 36a of the slinger 36 and the resin.

As described above, in the present embodiment, since the resin is injected from the through hole 36c of the slinger 36, the solidified member 40 is provided which is molded using the through hole 36c and the recess 5a of the inner ring element 5 as an integral mold. The recess 5a and the slinger 36 are integrally coupled via the solidifying member 40. Therefore, even if the slinger 36 is press-molded, it is securely engaged with the fitting surface 5b by the solidified member 40. Therefore, the inner ring element can be used regardless of the size of the fitting allowance caused by the processing tolerance. There is no movement for 5. In addition, since the cylindrical portion 36a is fixed by the solidifying member, creep deformation or the like hardly occurs.
The recess 5a is formed in an annular shape, and the center line passing through the center of the recess is inclined with respect to the axial center line of the bearing unit, and the solidifying member 40 is formed in an annular shape along the recess 5a. For this reason, the solidifying member 40 cannot easily move in the recess 5a both in the circumferential direction and in the axial direction. Therefore, the movement of the slinger can be reliably prevented.
Moreover, since the recessed part 5a is an annular groove, when the slinger 36 is fitted to the fitting surface 5b, it is not necessary to align the through hole 36c with respect to the recessed part 5a in the circumferential direction. In this case, the through hole 36c needs to be in the range of the inclined recess 5a as described above. That is, the through hole 36c does not have to be at the center in the width direction (axial direction) of the recess 5a, and the distance between the through hole 36c and the center in the width direction of the recess 5a may be changed depending on the position of the recess 5a. Even if the angle of the slinger 36 with respect to the recess 5a changes, the through hole 36c is in the range of the recess 5a, and the recess 5a and the through hole 36c must be in a state of being overlapped.

FIG. 4 shows a second embodiment of the first invention.
The second embodiment of the first invention is the same as the first embodiment of the first invention except for the shape of the solidified member 40.
At the time of molding, it is not necessary to form the resin so that it rises on the upper surface of the through hole 36c like the solidified member 40, and the outer peripheral surface side of the cylindrical portion 36a becomes almost flat like the solidified member 41 shown in FIG. You may form as follows.
FIG. 5 shows a third embodiment of the first invention. Note that the third embodiment of the first invention is the same as the first embodiment of the first invention except for the shape of the recess 5c and the solidifying member 42.
The concave portion of the inner ring element 5 may be formed in a rectangular cross section as shown in the concave portion 5c in FIG. The recess 5c is formed in an annular shape like the recess 5a, and a center line n2 passing through the center of the recess 5c is inclined with respect to the center line m in the axial direction of the bearing unit 20. When the resin is molded, if a molding die having a rectangular cross section is applied so as to cover the through hole 36c of the cylindrical portion 36a of the slinger 36, a solidified member having a rectangular cross section shown in FIG. 42 is formed.
Further, FIG. 6 shows a fourth embodiment of the first invention. The third embodiment of the first invention is the same as the first embodiment of the first invention except for the shape of the recess 5d and the solidifying member 43.
The recess of the inner ring element 5 may be formed in a triangular cross section having an inclined surface, as shown in the recess 5d of FIG. The recessed portion 5d is formed in an annular shape, like the recessed portion 5a, and is formed such that a center line n3 passing through the center of the circle is inclined with respect to the axial center line of the bearing unit 20. When molding, as in the molding of the solidified member 40 in FIG. 3, the resin is injected and solidified so that the outer peripheral surface side of the cylindrical portion 36a of the through hole 36c naturally rises, and the solidified member 43 is solidified. It is formed.

FIG. 7 shows a first embodiment of the second invention of the present invention. The second invention is characterized in that a resin slinger is used in addition to the formation of a recess in the inner ring element as in the first invention, and the other points are the same as in the first invention. Therefore, the characteristic part will be described below.
As shown in FIG. 7, a concave portion 5 c is formed in the central portion of the fitting surface 5 b with the slinger provided on the outer peripheral surface of the inner ring element 5. The recess 5c has a rectangular cross section, and is a groove connected in an annular shape along the peripheral surface of the fitting surface 5b. The center line n4 passing through the center of the circle is relative to the center line m in the axial direction of the bearing unit. And is formed to be slightly inclined. In other words, the locus of the circle drawn by the recess 5c is on a surface slightly inclined with respect to the surface orthogonal to the axial center line m of the inner ring element 5. The inclination angle is basically the same as in the case of the first invention described above, but the cylindrical portion 38a of the slinger 38 has no through hole as in the first invention, and the solidified member protruding from the through hole is also the same. Therefore, the range in which the seal lip slides is not limited by these. Therefore, in the second invention, the concave portion 5c can be tilted within a range in which the concave portion 5c is accommodated in the entire cylindrical portion 38a of the slinger 38.
The seal of the present embodiment has a cylindrical cylindrical portion 38a and an annular portion 38b formed in an annular shape so as to be bent from the outer peripheral edge of the cylindrical portion 38a, and the cross section is substantially L-shaped. The slinger 38 is formed in a state in which the cylindrical portion 38 a is fitted to the fitting surface 5 b of the inner ring element 5.
The slinger 38 is formed by arranging a slinger type (not shown) having an L-shaped cross section so as to straddle the concave portion 5c, and molding the resin by using the slinger type and the concave portion 5c as an integral die. It is formed. Therefore, an annular convex portion 38c is formed on the inner peripheral surface of the cylindrical portion 38a of the slinger 38 using the concave portion 5c as a mold.

As described above, in the present embodiment, the slinger 38 is made of resin formed by integrally molding up to the cylindrical portion 38a, the annular portion 38b, and the convex portion 38c, so that the processing tolerance varies more than press molding. In addition, since the convex portion 38c formed using the concave portion 5c of the inner ring element 5 as a mold is engaged with the concave portion 5c as it is after molding, the slinger 38 cannot move. Therefore, the movement of the slinger can be prevented, and creep deformation hardly occurs.
The recess 5c is formed in an annular shape, and the center line n4 passing through the center of the recess 5c is inclined with respect to the axial center line m of the bearing unit, and the projection 38c is annular along the recess 5a. Since they are connected and formed, the convex portion 38c cannot easily move in the concave portion 5c in the axial direction even in the circumferential direction. Therefore, movement of the slinger 38 and creep deformation can be reliably prevented.
In addition, although various thermoplastic resins, rubber | gum, and an adhesive agent can be used as resin molded, since the recessed part 5c is cyclic | annular, a thermoplastic resin is preferable. The thermoplastic resin is more effective in preventing the movement and deformation of the slinger 36 because the volume of the thermoplastic resin is reduced by solidification during molding and the bottom surface of the recess 5c is tightened.

FIG. 8 shows a second embodiment of the second invention.
In addition, 2nd Embodiment of 2nd invention has the structure similar to 1st Embodiment of 2nd invention except the shapes of the recessed part 5a and the convex part 37c differing.
In FIG. 8, the recess 5 a of the inner ring element 5 has a semicircular cross section and is formed in an annular shape, and a center line n 5 passing through the center of the circle is inclined with respect to the axial center line m of the bearing unit 20. It is formed as follows. By molding the resin using such a recess 5a and the aforementioned slinger mold as a mold, the slinger 37 having the cylindrical portion 37a, the annular portion 37b, and the convex portion 37c becomes the concave portion 5a of the inner ring element 5 as the convex portion 37c. Formed in an engaged state.
FIG. 9 shows a third embodiment of the second invention.
In addition, 3rd Embodiment of 2nd invention has the structure similar to 1st Embodiment of 2nd invention except the shapes of the recessed part 5e and the convex part 39c differing.
The recess 5e in FIG. 9 is formed in a triangular cross section having an inclined surface. The recess 5e is formed in an annular shape like the recess 5c, and a center line n6 passing through the center of the recess 5e is inclined with respect to the center line m in the axial direction of the bearing unit 20. By molding the resin, a slinger 39 having a cylindrical portion 39a, an annular portion 39b, and a convex portion 39c is formed in a state where the convex portion 39c is engaged with the concave portion 5e.

FIG. 10 shows a fourth embodiment of the second invention of the present invention.
In addition, 4th Embodiment of 2nd invention has the structure similar to 1st Embodiment of 2nd invention except the point which attached metal slinger 52 to resin-made slinger 51. FIG. .
The double slinger 50 shown in FIG. 10 is formed by combining a slinger 51 made of resin and a metal slinger 52.
Like the slinger 38 of FIG. 7, the slinger 51 is formed by molding on the fitting surface 5b of the inner ring element 5 in which the concave portion 5c is formed, and has a cylindrical portion 51a, an annular portion 51b, and a convex portion 51c. A step portion 51d is provided so that the edge portion of the annular portion 51b extends toward the cylindrical portion 51a along the circumferential direction. The step portion 51d is provided with one or a plurality of claw portions 51e. The step portion 51d and the claw portion 51e are formed at the time of molding.

  The resin used for the slinger 51 is mixed with magnetic powder such as ferrite powder. At the time of molding, the magnetic molds on the axial side of the annular part 51b are made different from each other, and the inner ring element 5 is molded while being magnetically insulated with a nonmagnetic material such as brass. If molded in this way, the ferrite powder is continuous even if the amount of the magnetic powder is small, and stronger magnetism can be obtained, and the resin bond in the matrix portion can be prevented from being inhibited by the ferrite powder. Therefore, the strength of the resin can be maintained.

The metal slinger 52 includes a cylindrical portion 52a and an annular portion 52b, has a L-shaped cross section, and is formed from metal by press molding. Examples of the metal include magnetic materials such as a low carbon steel plate and a martensitic stainless steel plate. The annular portion 52b is provided with a notch 52c that can lock the claw portion 51e.
The metal slinger 52 is attached by fitting the cylindrical portion 52 a to the cylindrical portion 51 a of the molded slinger 51. In this case, while aligning the position of the notch 52c with the claw portion 51e, the peripheral portion of the annular portion 52b is abutted against the stepped portion 51d of the annular portion 51b, and the outer side surface of the annular portion 51b and the outer side of the annular portion 52b. Install so that the side is in close contact. At this time, you may fix the contact surface of both slinger with an adhesive agent.
After the double slinger 50 is assembled in this way, the annular portion 51b of the slinger 51 is magnetized in multiple poles so that N and S poles are alternately arranged in the circumferential direction.

  In the above-described embodiment, the metal slinger 52 is attached so as to be in close contact with the resin slinger 51 in addition to being prevented from being moved or deformed by the convex portion 51c of the resin slinger 51. The slinger 52 made of resin reinforces the slinger 51 made of resin and increases the strength, thereby further preventing creep deformation.

Also, the metal slinger 52 is more preferable than the resin slinger 51 as the sliding surface of the seal lips such as the seal lips 17a, 17b, and 17c of the seal material 17 shown in FIG. .
In addition, since the claw portion 51e of the resin slinger 51 is engaged with the notch 52c of the metal slinger 52, the metal slinger 52 does not rotate relative to the resin slinger 51. That is, the metal slinger and the resin slinger are provided with an uneven structure that meshes with each other so as to restrict relative circumferential movement between the metal slinger and the resin slinger. Will be.

Moreover, since the metal slinger 52 is a magnetic material and the resin slinger 51 is magnetized in multiple poles, it can be used as an encoder used for speed detection or the like.
In the above description, the slinger fixed to the inner ring has been described. However, the present invention can also be applied to a member such as a seal core fixed to the outer ring. In this case, in the above description, the recess is not provided. Although it will be in the state provided in the outer periphery of the cylindrical inner ring | wheel, in a cylindrical outer ring | wheel, a recessed part is formed in the inner peripheral surface side. Therefore, the convex part of the solidified member or the resin slinger is in a state of protruding to the outer peripheral side of the cylindrical part and filling the concave part.

  In the first and second inventions described above, the slinger (L-shaped member) is more reliably prevented from moving by tilting the central axis of the recess with respect to the central axis of the inner ring. In this case, the position along the axial direction of the recess changes depending on the phase position (rotation angle) of the inner ring or the outer ring, but the following structure may be used instead of the structure in which the central axis of the recess is inclined. .

That is, the center axis of the annular bottom surface of the recess may be eccentric with respect to the center axis of the inner peripheral surface of the outer ring or the outer peripheral surface of the inner ring where the recess is formed. In this case, the central axis of the annular bottom surface of the concave portion is displaced with respect to the position of the central axis of the outer peripheral surface of the outer ring or the outer peripheral surface of the inner ring where the concave portion is formed. It depends on the phase position of the inner ring.
Also in this case, the movement of the L-shaped member relative to the outer ring or the inner ring can be prevented more reliably.

Further, instead of the structure in which the central axis of the recess is inclined, the width of the annular recess may be changed according to the phase position of the outer ring or the inner ring where the recess is formed. Also in this case, the movement of the L-shaped member relative to the outer ring or the inner ring can be prevented more reliably.
Note that the depth, the position along the axial direction, and the width of the recess need only change depending on the phase position of the outer ring and the inner ring where the recess is formed, and the center axis is not always in an eccentric state or inclined as described above. It does not have to be in a state.

It is sectional drawing which shows the bearing unit which concerns on 1st Embodiment of 1st invention of this invention. It is sectional drawing of the seal ring of a bearing unit. FIG. 4 is a diagram showing a main part of a fitting state between a slinger and an inner ring element provided in a seal ring, wherein (a) is a diagram showing an inclination of a center line of a recess of the inner ring element, and (b) is an inner ring element; It is a figure which shows the cross-sectional shape of a recessed part, slinger, and a solidification member. It is a figure which shows the recessed part of the inner ring | wheel element in 1st Embodiment of this invention, a slinger, and the cross-sectional shape of a solidification member. FIG. 10 is a diagram showing a main part of a fitting state of a slinger and an inner ring element in a third embodiment of the first invention of the present invention, and (a) is a diagram showing an inclination of a center line of a recess of the inner ring element. FIG. 6B is a diagram showing a cross-sectional shape of the concave portion of the inner ring element, the slinger, and the solidifying member. In the 4th Embodiment of 1st invention of this invention, it is the figure which showed the principal part of the fitting state of a slinger and an inner ring element, (a) is a figure which shows the inclination of the centerline of the recessed part of an inner ring element, etc. FIG. 6B is a diagram showing a cross-sectional shape of the concave portion of the inner ring element, the slinger, and the solidifying member. It is the figure which showed the principal part of the fitting state of the slinger provided in the seal ring of the bearing unit which concerns on 1st Embodiment of this invention, and an inner ring element, (a) is the center of the recessed part of an inner ring element It is a figure which shows the inclination of a line | wire, etc., (b) is a figure which shows the recessed part of an inner ring | wheel element, and the cross-sectional shape of a slinger. It is the figure which showed the principal part of the fitting state of the slinger and inner ring element in 2nd Embodiment of 2nd invention of this invention, (a) is a figure which shows the inclination etc. of the centerline of the recessed part of an inner ring element (B) is a figure which shows the recessed part of an inner ring | wheel element, and the cross-sectional shape of a slinger. It is the figure which showed the principal part of the fitting state of the slinger and inner ring element in 3rd Embodiment of 2nd invention of this invention, (a) is a figure which shows the inclination etc. of the centerline of the recessed part of an inner ring element (B) is a figure which shows the recessed part of an inner ring | wheel element, and the cross-sectional shape of a slinger. It is a figure which shows the slinger in 4th Embodiment of 2nd invention of this invention, (a) is sectional drawing, (b) is a partial top view. It is sectional drawing which shows an example of the conventional bearing unit. It is sectional drawing which shows the seal ring of the conventional bearing unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Hub 3 Rolling body 4 Hub body 5 Inner ring element 5a, 5c, 5d, 5e Recessed part 5b Fitting surface 6 Outer ring raceway 7 Inner ring raceway 13 Internal space 30, 30b Seal ring 15, 23 Seal core metal 32, 36, 37 , 38, 39, 51 Slinger 36c, Through holes 37c, 38c, 39c, 51c Convex parts 17, 25, 26 Sealing material 20 Bearing units 40, 41, 42, 43 Solidified member 50 Double slinger 51d Step part 51e Claw part 52 Metal slinger 52c Notch

Claims (14)

An outer ring having a raceway surface on the inner peripheral surface, an inner ring having a raceway surface on the outer peripheral surface and configured to support the rotation shaft inside thereof, and between the raceway surface of the outer ring and the raceway surface of the inner ring A plurality of rolling elements arranged to be freely rollable, a seal provided so as to close an opening of a space formed by the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring,
The seal has a cylindrical cylindrical portion and an annular portion formed in an annular shape so as to bend inward or outward along the radial direction from one end of the cylindrical portion, and has a substantially L-shaped cross section. In the bearing unit provided with an L-shaped member attached to the cylindrical portion fitted to the inner peripheral surface of the outer ring or the outer peripheral surface of the inner ring,
At the mounting position of the cylindrical portion on the outer peripheral surface or the inner peripheral surface, a concave portion covered with the cylindrical portion is provided,
The cylindrical portion is provided with a through hole at a position overlapping the concave portion, and is provided with a solidified member that is injected into the through hole and the concave portion and solidified from the through hole to the concave portion. Bearing unit. The recess is formed in an annular shape along the substantially circumferential direction on the outer peripheral surface or the inner peripheral surface,
The bearing unit according to claim 1, wherein the solidifying member is formed in an annular shape along the concave portion.   The center axis of the annular bottom surface of the recess is in an eccentric state with respect to the center axis of the inner peripheral surface of the outer ring or the outer peripheral surface of the inner ring where the recess is formed. The bearing unit described.   The bearing unit according to claim 2, wherein a center axis direction of the annular recess is inclined with respect to a center axis direction of an outer ring or an inner ring in which the recess is formed.   The bearing unit according to claim 2, wherein the width of the annular recess changes depending on a phase position of an outer ring or an inner ring in which the recess is formed. An outer ring having a raceway surface on the inner peripheral surface, an inner ring having a raceway surface on the outer peripheral surface and configured to support the rotation shaft inside thereof, and between the raceway surface of the outer ring and the raceway surface of the inner ring A plurality of rolling elements arranged to be freely rollable, a seal provided so as to close an opening of a space formed by the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring,
The seal has a cylindrical cylindrical portion, and an annular portion formed in an annular shape so as to be bent outward from one end of the cylindrical portion in the radial direction, and the cross section is substantially L-shaped. In the bearing unit provided with a slinger that is formed and fitted by fitting the inner peripheral surface of the cylindrical portion to the outer peripheral surface of the inner ring,
A recess is provided at a position where the slinger is provided on the outer peripheral surface of the inner ring,
The slinger is made of a resin formed by molding a resin with an annular slinger mold having an L-shaped cross section and an outer peripheral surface of the inner ring provided with the recess as an integral mold. The bearing unit is characterized in that a convex portion formed by using the concave portion as a mold is provided on an inner peripheral surface of the cylindrical portion. The recess is formed in an annular shape along the circumferential direction of the outer peripheral surface of the inner ring,
The bearing unit according to claim 6, wherein the convex portion is formed in an annular shape along the concave portion.   The bearing unit according to claim 7, wherein a central axis of an annular bottom surface of the concave portion is eccentric with respect to a central axis of an outer peripheral surface of an inner ring where the concave portion is formed.   The bearing unit according to claim 7, wherein a center axis direction of the annular recess is inclined with respect to a center axis direction of an inner ring in which the recess is formed.   The bearing unit according to claim 7, wherein a width of the annular recess changes depending on a phase position of an inner ring in which the recess is formed. A metal slinger having a cylindrical cylindrical portion and an annular portion formed in an annular shape so as to bend outward from one end of the cylindrical portion in the radial direction, and having an L-shaped cross section With
In the state where the cylindrical part of the resin slinger is inserted into the cylindrical part of the metal slinger, the annular part of the resin slinger and the annular part of the metal slinger are in close contact with each other. The bearing unit according to any one of claims 6 to 10, wherein a cylindrical portion of the metal slinger is fitted on an outer periphery of a cylindrical portion of the resin slinger.   The bearing unit according to claim 11, wherein the metal slinger is fixed to the resin slinger with an adhesive.   The metal slinger and the resin slinger are provided with a concavo-convex structure that meshes with each other so as to restrict relative movement in the circumferential direction between the metal slinger and the resin slinger. The bearing unit according to claim 11 or 12, characterized in that   14. The metal slinger is a magnetic material, and the resin slinger includes a magnetic material and is magnetized in multiple poles. Bearing unit.

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