JP2007292142A - Bearing unit for supporting wheel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing unit for supporting a wheel which adopts a rock-caulking for fixing an inner ring and a hub and enhances creep-preventive effect by a meshing structure without having adverse effect on the bearing. <P>SOLUTION: An inboard end 3a of a separate inner ring 3 to be fitted on the outside periphery of the hub 2 is fixed by rock-caulking at the inboard end 2e of the hub 2, and at least one recessed groove 3h is provided extendedly on the end face of the inboard end 3a of the inner ring 3 from the outer-diameter side of the inboard end 3a to the inner-diameter side. The outer-diameter side end of the recessed groove is provided with a notched outer-diameter of the inboard end 3a. The inboard end 2e of the hub 2 is caulked to allow the inboard end outside-face 2f of the hub 2 to penetrate into the recessed groove 3h. Thus, the inboard end 3a of the inner ring 3 and the caulked inboard end 2e of the hub 2 are meshed each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bearing unit for supporting wheels of various vehicles, and more specifically, a wheel that is fixed by caulking an inner ring end portion on the inboard side that is externally fitted to the outer diameter of the hub at the inboard side end portion of the hub. The present invention relates to a bearing unit for support (also referred to as a hub unit). In this specification, the term “wheel” is used to collectively refer to all the wheels of a railway vehicle regardless of the wheels of an automobile.

  For example, this type of wheel support bearing unit used for an automobile wheel is fitted with a hub having a raceway surface (first raceway surface) on the outer periphery on the outboard side and the outer periphery on the inboard side of the hub. An inner member composed of an inner ring (another inner ring) having the raceway surface (first raceway surface) and an adjacent raceway surface (second raceway surface), and a plurality of rows of the inner members An outer member having a plurality of rows of raceway surfaces facing the raceway surfaces (the first raceway surface and the second raceway surface), and being incorporated between the raceway surface of the inner member and the raceway surface of the outer member And a plurality of rolling elements. Then, the inboard side end portion of the hub is plastically deformed and fixed to the inboard side end portion of another inner ring fitted on the outer diameter of the hub by a swing caulking fixing method, and a preload is applied to the bearing. What is known.

In the case of such a wheel support bearing unit, when a large load (turning G, rapid acceleration, etc.) is applied, the caulking portion between the inner ring and the hub slips (inner ring creep), and the inner ring and the hub rotate relative to each other, and finally In particular, the phenomenon that the preload of the bearing was lost occurred. As measures for eliminating such a phenomenon (creep prevention measures), an increase in the tightening allowance between the inner ring and the hub, an increase in the axial length of the inner ring fitting portion, and the like can be considered.
In recent years, this type of wheel-supporting bearing unit has been in the direction of miniaturization, weight reduction, and cost reduction due to global environmental problems, etc. Yes. In other words, instead of the conventional nut method in which the hub and the inner ring are fixed using a nut, a swing caulking fixing method is adopted, thereby achieving a reduction in size, weight, and cost. .
However, as described above, the increase in the tightening allowance between the inner ring and the hub and the increase in the axial length of the inner ring fitting portion are adopted. The implications adopted will be very weak.

Therefore, as an example of various prior arts that aim to prevent creep while achieving the above-described objectives of reduction in size, weight, and cost by employing swing caulking and fixing, recently, for example, disclosed in Patent Documents 1 to 3 Technology is known.
In Patent Document 1, a plurality of fine concavo-convex shapes are provided in a chamfered portion of the inner ring inner diameter, and the inboard side end portion of the hub is plastically deformed and fixed to the concavo-convex shape.
In Patent Document 2 and Patent Document 3, an uneven shape is provided on the inner diameter of the inner ring, and the inboard side end portion of the hub is plastically deformed and fixed to the uneven shape.

However, in the creep prevention means disclosed in Patent Document 1, since the inboard side end of the hub is plastically deformed and fixed to fine irregularities such as the inner ring inner surface, even when a larger load is applied. A technical means that could be tolerated was desired.
In the creep prevention means disclosed in Patent Document 2 and Patent Document 3, since the inboard side end of the hub plastically deformed by caulking stress is expanded and fixed to the inner ring inner diameter, the circumferential stress on the inner ring There is a risk of deformation of the inner ring, a decrease in bearing life due to high circumferential stress, and destruction of the inner ring including delayed fracture.
JP 2005-147199 A JP 2004-345543 A JP 2001-001710 A

  The present invention has been made in order to solve such a problem, and an object of the present invention is to employ a rocking caulking and fixing system for fixing the inner ring and the hub, and the meshing structure without adversely affecting the bearing. Accordingly, it is an object of the present invention to provide a wheel support bearing unit capable of improving the creep prevention effect.

  In order to achieve such an object, a first invention of the present invention includes a hub having one or a plurality of rows of raceway surfaces, and a row that is fitted on the inboard side outer periphery of the hub and is adjacent to the raceway surfaces. Alternatively, an inner member configured with an inner ring having a plurality of rows of raceway surfaces, or an inner member configured with an inner ring fitted on the outer periphery of the hub and having a plurality of rows of raceway surfaces, and a plurality of the inner members. An outer member having a plurality of rows of raceways facing the raceways of the rows, and a plurality of rolling elements incorporated between the raceway of the inner member and the raceway of the outer member. In a wheel support bearing unit that is fixed by caulking the inboard side end portion of the inner ring at the inboard side end portion of the hub, the inboard side end portion of the inner ring to be caulked and fixed Between the inboard side end of the hub after tightening, or , Is that either or both between the outer diameter of the inner ring inner diameter and the hub is caulking has a wheel supporting bearing unit, characterized in that it is engaged.

  According to a second invention, in the first invention, the end face of the inboard side end portion of the inner ring is provided with at least one concave groove extending from the outer diameter side to the inner diameter side of the inboard side end portion. The outer diameter side end portion of the concave groove is provided by cutting out the outer diameter of the inboard side end portion, and the inboard side end portion of the hub is swaged to form the outer surface of the inboard side end portion of the hub. A wheel support bearing unit, wherein the inboard side end portion of the inner ring and the inboard side end portion of the hub after caulking are meshed with each other. It is that.

  A third invention is the wheel support bearing unit according to the second invention, wherein a plurality of concave grooves are provided radially from the inner ring shaft center in the radial direction.

  According to a fourth aspect of the present invention, in the first aspect of the invention, the end face of the end portion on the inboard side of the inner ring is provided with a spiral concave groove continuous from the outer diameter side to the inner diameter side of the end portion, and the hub inboard The inboard side end of the inner ring and the inboard side end of the hub after caulking are obtained by caulking the side end and causing the outer surface of the inboard side end of the hub to bite into the spiral groove. The wheel support bearing unit is characterized in that the portion is meshed with the portion.

  According to a fifth invention, in the first invention, the hub is provided with at least one recess or projection extending in the axial direction on the inner diameter of the inner ring, and the outer diameter position of the hub facing the recess or projection on the inner ring side. And at least one hub-side recess or projection extending in the axial direction to be engaged with and fixed to the inner ring-side recess or projection, and the inner and outer diameters of the inner ring and the hub are The wheel support bearing unit is characterized in that the wheel is engaged with the diameter.

  According to a sixth aspect of the present invention, in the fifth aspect, the inner ring side recess or projection is provided in an inboard side region of the inner ring inner diameter, and the hub side is located at the outer diameter position of the hub opposite to the inner ring side recess or projection. The wheel support bearing unit is characterized in that a recess or protrusion is provided.

  According to a seventh invention, in the fifth invention, the inner ring side recess or projection is provided in an outboard side region of the inner ring inner diameter, and the hub side is positioned at the outer diameter position of the hub opposite to the inner ring side recess or projection. The wheel support bearing unit is characterized in that a recess or protrusion is provided.

  In an eighth aspect based on the fifth aspect, the concave portion or convex portion on the inner ring side is provided over the entire area in the axial direction of the inner ring inner diameter, and the hub side is located at the outer diameter position of the hub facing the concave portion or convex portion on the inner ring side. The wheel support bearing unit is characterized in that a concave portion or a convex portion is provided.

  According to a ninth invention, in any one of the first to eighth inventions, the inner member includes a flange to which the braking member and the wheel are fixed, and the outer member has a flange fixed to the vehicle body side. The wheel support bearing unit is characterized by being provided.

  A tenth aspect of the invention is the wheel support bearing unit according to any one of the first to ninth aspects of the invention, which is fixed by caulking by swing caulking.

  ADVANTAGE OF THE INVENTION According to this invention, the bearing unit for wheel support which can anticipate the higher creep prevention effect without having a bad influence on a bearing was able to be provided.

Hereinafter, a wheel support bearing unit according to an embodiment of the present invention will be described with reference to the accompanying drawings. Note that the present embodiment is merely an embodiment of the present invention, and is not construed as being limited thereto. The design can be changed within the scope of the present invention.
The wheel support bearing unit of the present invention has a hub having one or more rows of raceway surfaces, and has one or more rows of raceway surfaces that are fitted on the inboard side outer periphery of the hub and are adjacent to the raceway surfaces. An inner member composed of an inner ring (separate inner ring) or an inner ring that is fitted on the outer periphery of the hub and has a plurality of rows of raceways, and a plurality of rows of raceways of the inner members The outer member having a plurality of raceway surfaces opposed to each other, and a plurality of rolling elements incorporated between the raceway surface of the inner member and the raceway surface of the outer member, All the wheel support bearing units that are fixed by caulking the inboard side end of the inner ring with the inboard side end of the hub are applicable.
In other words, the wheel support bearing unit of the present embodiment can be used for various vehicles such as automobiles and railway vehicles, but here, as an example, a wheel support bearing unit incorporated in a drive wheel of an automobile will be described. . The same applies to the driven wheels of automobiles.
Further, the wheel support bearing unit of the embodiment shown below is a type distinguished as so-called third generation (also referred to as HUBIII) in which flanges are provided on the inner member and the outer member, respectively. In addition to the third-generation type shown in the above, a double-row angular contact ball bearing or double-row tapered roller bearing (first generation) that integrates the outer ring of the rear combination bearing, and a flange on the outer circumference of the outer ring of the rear combination bearing Further, it can be applied to a type in which a double-row angular ball bearing or the like (second generation) is fitted on the outer periphery of the hub.
In addition, although the ball | bowl is illustrated as a rolling element in the Example shown below, it is also possible to apply a roller within the scope of the present invention.

1 to 3 show a first embodiment.
As shown in FIG. 1, the wheel support bearing unit of the present embodiment includes an inner member 1 serving as a rotating wheel, an outer member 4 serving as a stationary wheel, and the inner member 1 and the outer member 4. A plurality of rolling elements (balls) B1,..., B2... That are incorporated so as to be capable of rolling therebetween, and seal members S1, S2 that seal the inside of the bearing unit between the inner member 1 and the outer member 4. Has been. The seal members S1 and S2 can prevent the lubricant (for example, grease and oil) enclosed in the bearing from leaking to the outside of the bearing and foreign matters (for example, water and dust) from entering the inside of the bearing. A well-known seal structure is appropriately selected according to the specifications. In the figure, C indicates a cage.
In this embodiment, an example in which the outer member 4 is a stationary wheel and the inner member 1 is a rotating wheel will be described. However, the outer member is a rotating wheel and the inner member is a stationary wheel. It may be within the scope of the present invention.

  The inner member 1 includes a hub 2 that fixes an unillustrated axle (rotary shaft) to the inner periphery, and an inner ring (hereinafter referred to as a separate inner ring) 3 that is provided by being fitted to the hub 2.

The hub 2 has a hollow cylindrical shaft portion 2a having an inner diameter for fixing an axle (rotating shaft) (not shown) and an annular rising wall 2b suspended from an end of the shaft portion 2a on the outboard side. A disk-shaped hub flange 2c orthogonal to the direction is integrally formed, and a raceway surface (first raceway surface) 2s is annularly provided on the outer periphery near the rising wall 2b.
In addition, the hub 2 includes a stepped portion 2k that is recessed in a form that is one step lower than the outer peripheral region including the first raceway surface 2s in a predetermined outer peripheral region on the inboard side of the shaft portion 2a. .
A brake member (brake rotor) and wheels (not shown) are attached to the hub flange 2c. In the figure, 2g is a bolt (hub bolt) for mounting and fixing a disc of a braking member (brake rotor) (not shown).

The separate inner ring 3 has an inner diameter that can be externally fitted to a stepped portion 2k that is recessed in the outer periphery on the inboard side of the shaft portion 2a of the hub 2, and when the external ring 3 is fitted to the hub 2, the hub 2 The outer raceway has an outer diameter located on the same plane as the outer circumference of the first raceway surface, and the raceway surface (second raceway surface) 3s adjacent to the first raceway surface 2s on the hub 2 side is annularly provided on the outer circumference. It is configured as a hollow cylinder.
Further, the inboard side end 3a of the separate inner ring 3 has a predetermined axial thickness and is formed to have a larger diameter than the outer peripheral region provided with the second raceway surface 3s. Further, the axial end surface 3b of the end portion 3a includes a flat portion 3e extending from the outer diameter side edge 3c to a predetermined region, and a chamfered portion having a curvature continuously from the flat portion 3e toward the inner ring inner diameter 3d. 3f is provided.

An axial end surface 3b of the inboard side end 3a of the separate inner ring 3 extends from the outer diameter side edge 3c of the inboard side end 3a toward the inner ring inner diameter 3d, At least one concave groove 3h having an axial depth is provided, and when the inboard side end portion 2e of the hub 2 is swung and caulked, the outer surface 2f of the inboard side end portion of the hub 2 is formed into the concave portion. By being plastically deformed and biting into the groove 3h, the axial end surface 3b of the inboard side end 3a of the separate inner ring 3 and the inboard side end 2e of the hub 2 after crimping are engaged. .
The recessed groove 3h can be processed by machining, but can be recessed in advance by forging, and the processing method is not particularly limited.

In the present embodiment, a plurality of the concave grooves 3h are provided in the same shape radially in the radial direction from the axis of the separate inner ring 3. These concave grooves 3h are provided at equal intervals in the circumferential direction. The number of the recessed grooves 3h is not particularly limited and can be changed in design, and even numbers or odd numbers are within the scope of the present invention.
The outer diameter side end portion 3j of each concave groove 3h is provided by cutting out the outer diameter of the inboard side end portion 3a in the axial direction, and becomes shallower in the direction of the inner diameter 3d.
That is, as shown in FIGS. 2 and 4, the flat portion 3e is formed over the radial direction with the same depth as the rectangular notch depth obtained by notching the outer diameter of the inboard side end portion 3a in the axial direction. The chamfered portion 3f is gradually shallower in the direction of the inner ring inner diameter 3d depending on the tapered shape.
The depth of the groove 3h in the axial direction is designed within the scope of the present invention so that it does not interfere with the strength of the separate inner ring 3, and is not particularly limited. The depth of the inner ring 3 can be adjusted by the thickness of the inboard side end 3a of the inner ring 3. That is, if a stronger engagement is desired, the thickness of the inboard side end 3a may be adjusted to be thicker.

An outer member (in this embodiment, an outer ring is shown as an example of the outer member, and will be described as an outer ring hereinafter) 4. As shown in FIG. 1, the outer member 4 is substantially the same cylinder as the shaft portion 2a of the inner member 1. It is formed in a hollow cylindrical shape having a length and is arranged so as to cover the outer periphery of the shaft portion 2a.
The inner diameter of the outer ring 4 is formed larger than the inner diameter of the shaft portion 2a so as to form a predetermined bearing inner space with the outer diameter of the shaft portion 2a. Two first raceway surfaces 4 s and a second raceway surface 4 s are provided at predetermined intervals in the axial direction (intervals corresponding to the first raceway surface 2 s and the second raceway surface 3 s on the inner member 1 side). It is formed in an annular shape.
A flange 4c on the outer ring 4 side protrudes from the outer diameter of the outer ring 4, and the outer ring 4 is fixed to the vehicle body by inserting a bolt (not shown) or the like and fixing it to the vehicle body (for example, a knuckle (not shown)). Is done.

  For the caulking and fixing between the separate inner ring 3 and the hub 2, a known swing caulking and fixing method is employed.

First, the hub 2, the separate inner ring 3, the outer ring 4, the rolling elements B1, ..., B2, ... and the seal members S1, S2 having the above-described configuration are assembled to assemble a bearing assembly to be caulked and fixed.
Then, the assembly is set in a well-known swing caulking device, the conical upper mold is repeatedly swung, and a load is applied from the lower side, whereby the inboard side end 2e of the hub 2 is moved in the outer diameter direction. The outer surface 2f of the inboard side end portion 2e of the hub 2 pressed against the inboard side end surface 3b of the separate inner ring 3 is plastically deformed (in the direction of the inboard side end surface 3b of the separate inner ring 3). The inner ring 3 is caulked and fixed at the inboard side end 2e of the hub 2 by being plastically deformed and gradually biting into the respective recessed grooves 3h of the end surface 3b.

In this way, in this embodiment, all of the plurality of radially provided concave grooves 3h are provided long in the radial direction of the inboard side end surface 3b, so that the inboard side end portion 2e of the hub 2 is swung by caulking. When the end outer surface 2f is plastically deformed, the end 2e meshes in a long region in the radial direction.
Further, since the concave groove 3h is provided deep in the outer diameter direction (flat portion 3e) and shallow in the inner diameter direction (chamfered portion 3f), the end outer surface 2f that undergoes plastic deformation during swing caulking is provided. It is easy to bite in from the inner diameter side to the outer diameter side, and the meshing can be performed reliably.
Therefore, since the separate inner ring 3 and the hub 2 are physically meshed with each other, a pseudo gear is meshed, and even if a heavy load is applied, creep is prevented unless the meshing portion is damaged. Can continue. In addition, according to the present embodiment, the plurality of concave grooves 3h are provided radially, and the radial length region is long, so that the meshing structure region is large and the creep prevention force is extremely high. Further, by increasing the thickness (axial thickness) of the inboard side end 3a of the separate inner ring 3, a deeper groove 3h can be provided, and a strong meshing structure can be provided.
"Modification 1"

Forms such as the radial length and the axial depth of the concave groove 3h of the meshing structure formed by swinging caulking between the inboard side end 3a of the separate inner ring 3 and the inboard side end 2e of the hub 2 are particularly limited. However, the design can be appropriately changed within the scope of the present invention.
For example, the groove 3h extending in the radial direction may be provided only in the flat portion 3e.
In this case, for example, as shown in FIG. 6, immediately before the end of the caulking step, the outer diameter of the contact portion between the caulking die (upper die) and the caulked portion is D2, and the inscribed circle diameter of the concave groove 3h is When D1 is set, a groove 3h is provided at a position where D2 ≦ D1. As shown in FIG. 5, the concave groove 3h is provided only in a half region near the outer diameter of the flat portion 3e.
As a result, the high-stress part that is in direct contact with the crimping die has a uniform state on the circumference, and the hub stretched by crimping without applying excessive force to the die or the crimping part. The tip part of the outer surface 2f part of the inboard side end part 2 bites into the concave groove 3h (see FIG. 6).

FIG. 7 shows a second embodiment of the present invention.
In the present embodiment, an example of a meshing structure different from the meshing structure of the inboard side end 3a of the separate inner ring 3 and the inboard side end 2e of the hub 2 shown in the first embodiment is shown, and other configurations are implemented. Since it is the same as that of Example 1, the description about the components other than the meshing structure and the operation effect is the same as the description of Example 1, and the description here is omitted.

  The meshing structure in the present embodiment is continuous with the axial end surface 3b of the inboard side end portion 3a of the separate inner ring 3 from the outer diameter side of the end portion 3a toward the inner diameter side (the outer diameter side of the chamfered portion 3f). The inner groove 2h of the hub 2 is crimped, and the outer surface 2f of the inboard edge of the hub 2 is bitten into the helical groove 3h. A structure is employed in which the inboard side end portion 3a of the separate inner ring 3 and the inboard side end portion 2e of the hub 2 after crimping are engaged. That is, the spiral groove 3h of the present embodiment is provided only in the flat portion 3e.

  The number of turns of the spiral groove 3h is not limited, but is most preferably set to the number of turns that makes one round of the flat portion 3e.

In addition, according to the present embodiment, the inner diameter side end of the spiral concave groove 3h is cut out at the outer diameter side of the chamfered portion 3f, that is, the boundary with the flat portion 3e. The outer surface 2f of the second inboard side end portion 2e is easily deformed by plastic deformation.
Further, in this method, the crimped inboard side end portion 2e does not fall into the concave groove 3h and becomes relatively flat, so that swing caulking can be easily performed.
In addition, the processing method of the spiral groove 3h is not particularly limited, but a method of cutting by sending a cutting tool in synchronization with rotation by an NC lathe is assumed.

8 to 12 show a third embodiment of the present invention.
In the present embodiment, an example of a meshing structure different from the first and second embodiments is shown, and is an example of a structure that meshes between the inner diameter 3d of the separate inner ring 3 and the outer diameter 2d of the hub 2 that are caulked and fixed.
Since the other configuration is the same as that of the first embodiment, the description of the first embodiment is used for the description of the components and the effects other than the meshing structure unique to the present embodiment, and the description thereof is omitted here.

The meshing structure in the present embodiment includes at least one concave portion or convex portion extending in the axial direction on the inner diameter 3d of the separate inner ring 3, and the hub 2 facing the concave or convex portion on the separate inner ring 3 side. At least one hub 2 side recess or projection extending in the axial direction for engaging and fixing with the recess or projection on the separate inner ring 3 side is provided at the outer diameter position, and both the recess and projection are engaged with each other. A structure is employed in which the inner diameter 3d of the separate inner ring 3 and the outer diameter 2d of the hub 2 are engaged with each other.
In this embodiment, serration is adopted as an example of the meshing structure of the concave portion and the convex portion extending in the axial direction.

In the present embodiment, a serration 5 extending in the axial direction of the inner ring inner diameter 3d is provided in the inboard side region of the inner diameter 3d of the separate inner ring 3, and the hub 2 facing the serration 5 on the separate inner ring 3 side is provided. A serration 6 on the hub 2 side extending in the axial direction of the outer diameter 2d is provided at the position of the outer diameter 2d.
The serration 5 is processed by knurling, for example, on the inner diameter 3d of the inboard side end portion 3a formed to have a larger diameter than the outer peripheral region provided with the second raceway surface 3s of the separate inner ring 3. In addition, the serration 5 has a diameter that is slightly smaller than the inner ring inner diameter 3d after grinding (the inner diameter region of the portion having the second raceway surface 3s).
The outer peripheral predetermined region of the inboard side end 2e of the shaft portion 2a of the hub 2 is slightly smaller than the inscribed circle diameter of the serration 5 of the separate inner ring 3 when the separate inner ring 3 is externally fitted. A stepped portion 2n that is one step lower than the outer fitting region is provided so as not to hit the serration 5.
In the case of the present embodiment, since the load line of the bearing passes through the meshing portion between the serrations 5 and 6, it is appropriate when the bearing load is relatively small.
According to the present embodiment, the inner diameter 3d of the separate inner ring 3 and the hub, as well as the structure of the inboard side end 2e of the hub 2 to the inboard side end 3a of the separate inner ring 3 (swiveling and swaging) are provided. 2 has both the meshing structure of the serrations 5 and 6 having an outer diameter 2d of 2, and the effect of preventing creep is extremely high.
Further, according to the present embodiment, the inner ring inner diameter 3d and the hub outer diameter 2d merely mesh with each other of the serrations 5 and 6, and the inboard side end 2e of the hub 2 is expanded to increase the inner ring inner diameter. Since it is not fixed to 3d, there is no risk of inner ring deformation, including deformation of the inner ring, bearing life reduction due to high circumferential stress, and delayed fracture, without increasing the circumferential stress on the inner ring. .
"Modification 1"

FIGS. 13 to 17 show a modification of the meshing structure of the third embodiment, and a serration 5 extending in the axial direction of the inner ring inner diameter 3d is provided in the outboard side region of the inner diameter 3d of the separate inner ring 3. A hub 2 side serration 6 extending in the axial direction of the outer diameter 2d is provided at a position of the outer diameter 2d of the hub 2 facing the serration 5 on the other inner ring 3 side. In this embodiment, the serration 6 extends over the entire area in the axial direction of the outer diameter 2d. Since only the form of the serration is different and the other structure is the same as that of the third embodiment, the description is omitted.
In the case of this modification 1, the meshing force becomes stronger than in the case of the first embodiment. Further, since the load line of the bearing does not pass through the meshing portion between the serrations 5 and 6, it is appropriate when the bearing load is relatively large.
In the figure, the serration is expressed by a cross-sectional rectangle, but this is for emphasis, and the cross-sectional shape may be a triangle or an involute curve.
"Modification 2"

  FIGS. 18 to 22 show another modification of the meshing structure of the third embodiment, which is provided with a serration 5 extending over the entire axial direction of the inner diameter 3d of the separate inner ring 3, and is provided on the separate inner ring 3 side. A hub 2 side serration 6 is provided at the position of the outer diameter 2d of the hub 2 facing the serration 5 and extends across the entire axial direction of the outer diameter 2d. Since only the form of the serration is different and the other structure is the same as that of the third embodiment, the description is omitted.

Although not specifically shown, the inboard side end 3a of the separate inner ring 3 is provided with a serration extending in the radial direction, and is extended in the axial direction on the outer surface 2f of the inboard side end 2e of the hub 2. Serrations may be provided, and the serrations may be engaged with each other when crimped.
Moreover, each said Example is only an example of implementation of this invention, The inboard side edge part 2e of the inboard side edge part 3a of the said separate inner ring | wheel 3 fixed by crimping, and the hub 2 after crimping, Or a configuration in which either the inner diameter 3d of the separate inner ring 3 and the outer diameter 2d of the hub 2 that are fixed by caulking are engaged is shown in the first embodiment. A form having both the meshing structure and the meshing structure shown in Example 3 or a form having both the meshing structure shown in Example 2 and the meshing structure shown in Example 3 is also possible. Is within.

It is a schematic sectional drawing which shows Example 1 of this invention wheel support bearing unit. It is a principal part enlarged view of FIG. It is a schematic end view of the inboard side end part of another body ring. It is a schematic perspective view of another body ring. FIG. 6 is a schematic end view showing a part of an inboard side end portion of another body ring used in Modification 1 of Example 1. FIG. 6 is a schematic cross-sectional view partially showing a wheel support bearing unit using the separate inner ring of FIG. 5. It is a schematic end view of the inboard side end part of another body ring used in the wheel support bearing unit of the second embodiment. It is a schematic sectional drawing which shows the wheel support bearing unit of Example 3 partially. It is a principal part enlarged view of FIG. It is a schematic end view of the inboard side end part of another body ring. It is a schematic perspective view of another body ring. It is a schematic perspective view which shows a hub partially. FIG. 10 is a schematic cross-sectional view partially showing a wheel support bearing unit of a first modification in the third embodiment. It is a principal part enlarged view of FIG. It is a schematic end view of the inboard side end part of another body ring. It is a schematic perspective view of another body ring. It is a schematic sectional drawing which shows a hub partially. It is a schematic sectional drawing which shows partially the wheel support bearing unit of the modification 2 in Example 3. FIG. It is a principal part enlarged view of FIG. It is a schematic end view of the inboard side end part of another body ring. It is a schematic perspective view of another body ring. It is a schematic sectional drawing which shows a hub partially.

Explanation of symbols

1 inner member 2 hub 2d outer diameter 2e inboard side end 2s first raceway surface 3 separate inner ring 3a inboard side end 3d outer diameter 3s second raceway surface 4 outer members 4s, 4s first Raceway surface, second raceway surface B1, B2 Rolling elements

Claims (10)

A hub having one or more rows of raceway surfaces, and an inner ring fitted with the outer periphery of the hub on the inboard side and having one or more rows of raceway surfaces adjacent to the raceway surface, or a hub An inner member that is configured with an inner ring that has a plurality of raceway surfaces,
An outer member having a plurality of rows of raceways facing the rows of raceways of the inner member;
It comprises at least a plurality of rolling elements incorporated between the raceway surface of the inner member and the raceway surface of the outer member,
In the wheel support bearing unit fixed by caulking the inboard side end of the inner ring at the inboard side end of the hub,
Either between the inboard side end of the inner ring to be crimped and fixed and the inboard side end of the hub after crimping, or between the inner diameter of the inner ring to be crimped and fixed to the outer diameter of the hub Or a bearing unit for supporting a wheel, wherein both are meshed. The end surface of the inboard side end portion of the inner ring includes at least one concave groove extending from the outer diameter side of the inboard side end portion toward the inner diameter side, and the outer diameter side end portion of the concave groove is It is provided with a cutout outer diameter of the inboard side end,
The inboard side end portion of the inner ring and the inboard side of the hub after crimping are formed by caulking the inboard side end portion of the hub and causing the outer surface of the inboard side end portion of the hub to bite into the concave groove. The wheel support bearing unit according to claim 1, wherein the end portion is meshed with the wheel support bearing unit.   The wheel support bearing unit according to claim 2, wherein a plurality of the concave grooves are radially provided from the inner ring shaft center in a radial direction. Provided on the end surface of the end portion on the inboard side of the inner ring is a spiral groove that continues from the outer diameter side to the inner diameter side of the end portion,
By caulking the inboard side end of the hub and causing the outer surface of the inboard side end of the hub to bite into the spiral groove, the inboard side end of the inner ring and the hub after caulking The wheel support bearing unit according to claim 1, wherein the inboard side end portion is meshed with the wheel support bearing unit. Comprising at least one recess or projection extending in the axial direction on the inner diameter of the inner ring,
At least one hub-side recess or projection extending in the axial direction to mesh with and fix the inner ring-side recess or projection at the outer diameter position of the hub facing the inner ring-side recess or projection,
2. The wheel support bearing unit according to claim 1, wherein an inner diameter of the inner ring and an outer diameter of the hub are engaged with each other by engaging both the concave and convex portions. 3.   The inner ring side recess or projection is provided in the inboard side region of the inner ring inner diameter, and the hub side recess or projection is provided at the outer diameter position of the hub opposite to the inner ring side recess or projection. The wheel support bearing unit according to claim 5, wherein   The inner ring side recess or projection is provided in an outboard side region of the inner ring inner diameter, and the hub side recess or projection is provided at the outer diameter position of the hub opposite to the inner ring side recess or projection. The wheel support bearing unit according to claim 5, wherein   The concave portion or convex portion on the inner ring side is provided over the entire axial direction of the inner ring inner diameter, and the concave portion or convex portion on the hub side is provided at the outer diameter position of the hub facing the concave portion or convex portion on the inner ring side. The wheel-supporting bearing unit according to claim 5. The inner member includes a flange to which the braking member and the wheel are fixed,
The wheel support bearing unit according to any one of claims 1 to 8, wherein the outer member is provided with a flange fixed to the vehicle body side. The wheel support bearing unit according to any one of claims 1 to 9, wherein the wheel support bearing unit is fixed by swaging.

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