JP5205984B2 - Vehicle bearing device - Google Patents

Description

  The present invention relates to a vehicular bearing device, and more particularly to a vehicular bearing device in which moisture intrusion into the vehicular bearing device is suppressed and the occurrence of rust is reduced compared to the prior art.

  Generally, a vehicular bearing device used in an automobile or the like is provided with a sealing device for preventing intrusion of moisture such as muddy water during traveling. This is because if moisture enters the vehicle bearing device, rust may be generated inside the vehicle bearing device, or the bearing may be burned by a substance mixed in the moisture. However, it has been difficult to obtain a sufficient waterproof effect with only one set of sealing devices. In addition, combining the contact-type sealing device at another stage increases the rotational torque of the bearing and reduces the fuel consumption.

Therefore, a technique for forming a seal structure while providing a protective cover for protecting the inside of a vehicle bearing device from muddy water and the like and covering an opening between the outer ring and the inner ring at an outer diameter than the seal device (sealing device) is disclosed. Has been. With this configuration, it is possible to prevent the muddy water or the like from being directly applied to the sealing device (sealing device), and to prevent the entry of muddy water and foreign matter into the portion covered with the protective cover, that is, the sealing device. It is described that the sealing performance of the apparatus can be maintained over a long period of time (for example, Patent Document 1).
JP 2006-132618 A

  However, in the technique described in Patent Document 1, although the waterproof capability of the vehicle bearing device is improved, if a mudguard structure using a protective cover is added to the bearing device, the weight of the entire bearing device increases. There was a problem that it was difficult to reduce the weight.

  The present invention has been made in view of the above circumstances, and is capable of improving the waterproof capability while suppressing an increase in weight and suppressing the occurrence of rust inside the vehicle bearing device. It is an issue to provide.

(1) This means is “a vehicle bearing device that supports a wheel, wherein the vehicle bearing device has a rotating member, the rotating member has a flange portion, and the flange portion A portion that protrudes radially outward from the rotating member, has an annular shape, and is attached to the wheel, and includes an outer surface, an opposite surface, a drainage structure, and a plurality of inter-groove portions, and the outer surface is The flange portion indicates a surface to which the wheel is attached, the opposite surface indicates a surface opposite to the outer surface of the flange portion, and the drainage structure has a water droplet attached to the opposite surface. A structure having a function of collecting the collected water droplets by centrifugal force when the rotating member is rotating and draining the collected water droplets outward in the radial direction of the flange portion, and having a plurality of grooves, The flange formed on the opposite surface Is formed over the radially inner portion to the end portion of the radially outer side of the flange portion, the groove inner portion, Mizogai side portions, and a groove intermediate portion, the groove inner portion, said Formed in a radially inner portion of the flange portion, the groove outer portion is formed at a radially outer end of the flange portion, and is different from the groove inner portion in the circumferential direction of the flange portion. The groove middle portion is formed between the groove inner portion and the groove outer portion, and has a shape that extends while bending from the groove inner portion toward the groove outer portion. The inter-groove portion is formed between one of the plurality of grooves and another one of the plurality of grooves, and the width of the groove in the circumferential direction of the flange portion is the flange A vehicle bearing device that is smaller than the width of the portion between the grooves in the circumferential direction of the portion.
(2) One form of the above means is that “the flange portion has a plurality of bolt holes, and the bolt holes are holes for inserting bolts for fixing the wheel and the flange portion to each other. , A vehicle bearing device formed in the portion between the grooves ”.
(3) One mode of the above means is that “the groove has a bottom surface, a first side surface, a second side surface, a first boundary portion, and a second boundary portion, and the first side surface is between the plurality of grooves. A surface of one inter-groove portion of the portion and a shape continuous to the bottom surface, and the second side surface is a surface of another inter-groove portion of the plurality of inter-groove portions, And the first boundary portion is a boundary portion between the bottom surface and the first side surface, and has a first inner end portion and a first outer end portion, The second boundary portion is a boundary portion between the bottom surface and the second side surface, and has a second inner end portion and a second outer end portion, and the groove inner portion is the first inner portion. An outer end portion and the second inner end portion, the outer groove portion has the first outer end portion and the second outer end portion, and the first inner end portion is At the first boundary The first outer end portion indicates the radially outer end portion of the first boundary portion, and the first inner end portion in the circumferential direction of the flange portion. The second inner end portion is a radially inner end portion of the second boundary portion, and the second outer end portion is formed on the second outer end portion side. Forming a radially outer end portion in the second boundary portion, and a portion opposite to the first inner end portion side with respect to the second inner end portion in the circumferential direction of the flange portion; and A vehicular bearing device formed on a portion of the first outer end opposite to the first inner end.
(4) One form of the above means is that “the vehicle bearing device has an outer ring as a fixing member and an inner ring member as the rotating member, and the outer ring supports the rotating member and is fixed to the vehicle. The inner ring member has a hub shaft and an inner ring, the hub shaft has a hub shaft main body portion and the flange portion, and the flange portion is an axial direction in the hub shaft main body portion. A vehicle that is formed at an outer end portion and has an outer ring facing portion, and the outer ring facing portion constitutes a radially inner portion of the flange portion and faces an end portion on the outer side in the axial direction of the outer ring. Bearing device ".

According to the above configuration, the flange portion collects water droplets attached to the flange portion by centrifugal force accompanying the rotation of the rotating member in the rotating state of the rotating member, and drains the collected water droplets outward in the radial direction. Therefore, it is possible to prevent water droplets adhering to the flange portion from entering the inside of the vehicle bearing device. Therefore, it is possible to suppress the occurrence of rust inside the vehicle bearing device due to the ingress of water droplets adhering to the flange portion. Moreover, since the effect of suppressing rust can be achieved only by the structure of the flange portion, it is not necessary to add special parts. Therefore, an increase in weight due to an increase in members can be suppressed. Further, according to the above configuration, the drainage structure is provided on the surface opposite to the surface fixed to the wheel of the flange portion, and includes a plurality of spiral grooves extending in the radial direction from the vicinity of the center portion of the flange portion. For this reason, water droplets adhering to the surface opposite to the surface fixed to the wheel of the flange portion are collected inside the groove as the rotating member rotates, resulting in larger water droplets than when adhering. Further, since the enlarged water droplets are easily affected by the centrifugal force, the water droplets collected in the groove are splashed and drained by the centrifugal force. Therefore, in the rotation state of the rotating member, water droplets are prevented from entering the vehicle bearing device through the flange portion.

(5) One form of the means is as follows: “The vehicle bearing device has a fixing member and a sealing device in addition to the rotating member according to any one of claims 1 to 3. 4. A sealing device is provided in addition to the outer ring as the fixing member and the inner ring member as the rotating member according to claim 4, wherein the sealing device is fitted to the fixing member, and the fixing member supports the rotating member. And a vehicle bearing device in which plating is applied to a portion that is fixed to the vehicle and to which the sealing device is fitted.

  According to the said structure, since the part which is a surface of a fixing member and a sealing device is fitted is plated, it can suppress that rust generate | occur | produces in the part into which a sealing device is fitted. Therefore, the generation of rust in the vehicle bearing device can be further suppressed. Further, since the effect of suppressing rust can be achieved by the structure of the flange portion and plating, it is not necessary to add special parts. Therefore, an increase in weight due to an increase in members can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, while suppressing the increase in weight, the waterproof capability can be improved and the vehicle bearing apparatus which can suppress that rust generate | occur | produces inside a vehicle bearing apparatus can be provided.

(First embodiment)
An embodiment of a vehicle bearing device embodying the present invention will be described below with reference to FIGS.

  As shown in FIG. 1, a substantially cylindrical outer ring 4 as a fixing member is fixed to a vehicle (not shown) via a flange portion 7 that protrudes outward in the radial direction (radial direction) from the outer peripheral surface thereof. ing. In addition, tin plating is applied to the outer peripheral surface 12a on the outer side in the axial direction (axial direction), and a sealing device 13a is fitted in the plated part. Similarly, the end inner peripheral surface 12b on the vehicle body side in the axial direction is also tin-plated, and the sealing device 13b is fitted in the plated portion. Furthermore, a raceway surface 5a is provided on the side of the vehicle body in the vicinity of the plated inner peripheral surface 12a as well as the inner peripheral surface of the outer ring 4, and similarly, the inner peripheral surface of the outer ring 4. A raceway surface 5b is provided on the outside in the vicinity of the plated inner peripheral surface 12b.

  On the other hand, an inner ring member 1 as a rotating member to which a wheel is fixed is composed of a substantially cylindrical hub shaft 2 and a substantially annular inner ring 3 fitted and fixed to the hub shaft 2. An end portion on the outer side in the axial direction of the hub shaft 2 includes an annular guide portion 15 projecting outward in the axial direction and a flange portion 6 projecting outward in the radial direction. A wheel is fixed to the hub shaft 2 via the flange portion 6. A small-diameter portion 8 is formed at an end portion on the vehicle body side in the axial direction of the hub shaft 2, and the above-described inner ring 3 is fitted on the outer peripheral surface of the small-diameter portion 8. A raceway surface 9 a is formed at a position corresponding to the raceway surface 5 a of the outer ring 4 as well as the outer peripheral surface on the vehicle body side from the flange portion 6 of the hub axle 2. A rolling element 11a is interposed between the raceway surface 5a and the raceway surface 9a so as to be able to roll. Similarly, a track surface 9 b is formed at a position corresponding to the track surface 5 b of the outer ring 4 as well as the outer peripheral surface of the inner ring 3. A rolling element 11b is interposed between the raceway surface 5b and the raceway surface 9b so as to be able to roll. Further, the sealing device 13a fitted in the outer end of the outer ring 4 is the inner peripheral surface of the hub shaft 2 and is in sliding contact with the root portion of the flange 6, and similarly, the inner end of the outer ring 4 is connected to the end of the outer ring 4 on the vehicle body side. The fitted sealing device 13b is an inner peripheral surface of the inner ring 3 and is in sliding contact with the vehicle body side end portion.

  Here, as shown in FIGS. 2 to 15, the surface 6 b opposite to the surface 6 a to which the wheel of the flange portion 6 of the hub shaft 2 described above is attached, that is, the surface on the vehicle body side in the axial direction is the center of the flange portion 6. A plurality of spiral grooves 20 extending from the vicinity of the portion in the radial direction and extending in the counter-rotating direction of the hub 2 are provided. The plurality of spiral grooves 20 function as a drainage structure that collects water droplets adhering to the surface of the flange portion 6 on the vehicle body side and drains them outward by centrifugal force.

  More specifically, in the rotational state of the hub shaft 2, since the inertia force and the frictional force with air act on the water droplets adhering to the vehicle body side surface of the flange portion 6, the center is delayed from the rotational speed of the flange portion 6. Rotate around an axis. Therefore, it moves so as to slide on the surface of the flange portion 6 and is supplemented by the groove 20. In this way, water droplets adhering to the vehicle body side surface of the flange portion 6 are gathered together in the groove 20 and are further pressed against the inner wall 21 of the groove 20 to form larger water droplets. On the other hand, since the hub shaft 2 is rotating, an outward centrifugal force acts in the radial direction on the water droplets rotating together with the hub shaft 2. Since the centrifugal force increases in proportion to the weight of the substance, the centrifugal force also increases as the water droplet increases, so that the water droplet starts to move outward in the radial direction. In addition, since the centrifugal force works stronger as it is located radially outward from the center of rotation, the stronger centrifugal force acts on the water droplet as it moves outward in the radial direction, and the water droplet accelerates outward in the radial direction. Move to. The water droplets reaching the outer end 22 of the groove 20 are drained to the outside of the vehicle bearing device 10 by being shaken off outward in the radial direction.

  Further, water droplets traveling along the outer end of the outer ring 4 are prevented from entering the vehicle body in the axial direction by the sealing device 13a. Further, since the outer peripheral surface 12a on the outer side in the axial direction of the outer ring 4 is tin-plated, rust is generated at the interface between the outer ring 4 and the sealing device 13a, or moisture is generated from the interface between the outer ring 4 and the sealing device 13a. Does not invade. Similarly, water droplets traveling along the outer end of the outer ring 4 are prevented from entering the outer side in the axial direction by the sealing device 13b. Since the inner peripheral surface 12b on the vehicle body side in the axial direction of the outer ring 4 is also tin-plated, rust is generated at the interface between the outer ring 4 and the sealing device 13b, or moisture enters from the interface between the outer ring 4 and the sealing device 13b. There is nothing to do.

  According to the vehicle bearing device of the embodiment, the following effects can be obtained.

  (1) According to the vehicle bearing device according to the above-described embodiment, the flange portion 6 has a structure that excludes water droplets adhering to the flange portion 6 due to centrifugal force when the hub shaft 2 is rotated. It is possible to suppress water droplets adhering to the inside of the vehicle bearing device. Accordingly, it is possible to suppress the occurrence of rust inside the vehicle bearing device 10 due to the ingress of water droplets adhering to the flange portion 6. Further, since the effect of suppressing rust can be achieved only by the structure of the flange portion 6, it is not necessary to add special parts. Therefore, an increase in weight due to an increase in members can be suppressed.

  (2) According to the vehicle bearing device 10 according to the above-described embodiment, the plurality of spiral grooves 20 for collecting water droplets attached to the flange portion 6 are provided on the surface opposite to the surface on which the wheels are attached. Therefore, water droplets adhering to the surface of the flange opposite to the surface to which the wheel is attached are collected inside the groove 20 when the flange rotates, and become larger water droplets than at the time of adhesion. Further, since the enlarged water droplets are easily affected by the centrifugal force, the water droplets collected in the groove 20 are splashed off by the centrifugal force and eliminated. Therefore, in the rotating state of the rotating member, water droplets are prevented from entering the inside of the vehicle bearing device through the flange portion 6.

  (3) According to the vehicle bearing device 10 according to the above-described embodiment, since the groove 20 is formed in the flange portion 6, the weight of the flange portion is smaller than that of the conventional one, and the vehicle bearing device is reduced in weight.

  (4) According to the vehicle bearing device 10 according to the above-described embodiment, the surface of the fixed member and the portion into which the sealing device is fitted are plated, so that rust is generated inside the vehicle bearing device 10. Can be further suppressed. Further, since the effect of suppressing rust can be achieved by the structure of the flange portion 6 and plating, it is not necessary to add special parts. Therefore, an increase in weight due to an increase in members can be suppressed.

(Second Embodiment)
Next, a vehicle bearing device according to a second embodiment of the present invention will be described with reference to FIGS. In addition, since 2nd Embodiment is a structure which only changed the shape of the flange part of 1st Embodiment, the detailed description is abbreviate | omitted about the same part.

  In the present embodiment, as shown in FIGS. 16 to 29, the flange portion 6 is provided on the surface 6 b opposite to the surface 6 a to which the wheel of the flange portion 6 of the hub shaft 2 is attached, that is, on the surface on the vehicle body side in the axial direction. A plurality of spiral ribs 30 are provided that extend outward in the radial direction from the vicinity of the center and extend in the counter-rotating direction of the hub 2. The plurality of ribs 30 function as a drainage structure that collects water droplets adhering to the surface of the flange portion 6 on the vehicle body side and drains them outward by centrifugal force.

  More specifically, in the rotational state of the hub shaft 2, since the inertia force and the frictional force with air act on the water droplets adhering to the vehicle body side surface of the flange portion 6, the center is delayed from the rotational speed of the flange portion 6. Rotate around an axis. Therefore, it moves so as to slide on the surface of the flange portion 6, gathered on the side wall 31 of the rib 30, and further pressed against the side wall 31 of the rib 30, resulting in larger water droplets. On the other hand, since the hub shaft 2 is rotating, an outward centrifugal force acts in the radial direction on the water droplets rotating together with the hub shaft 2. Since the centrifugal force increases in proportion to the weight of the substance, the centrifugal force also increases as the water droplet increases, so that the water droplet starts to move outward in the radial direction. In addition, since the centrifugal force works stronger as it is located radially outward from the center of rotation, the stronger centrifugal force acts on the water droplet as it moves outward in the radial direction, and the water droplet accelerates outward in the radial direction. Move to. The water droplets that have reached the outer end 32 of the side wall 31 of the rib 30 are drained to the outside of the vehicle bearing device 10 by being shaken off outward in the radial direction.

  Therefore, according to the second embodiment, in addition to the effects described in the first embodiment, the following effects can be obtained.

  (1) According to the vehicle bearing device 10 according to the second embodiment, a plurality of spiral ribs 30 for collecting water droplets adhering to the flange portion 6 are provided on the surface opposite to the surface to which the wheels are attached. Therefore, the water droplets adhering to the opposite surface of the flange portion 6 to the surface on which the wheel is attached are collected on the side walls of the ribs 30 when the flange portion 6 rotates as the hub shaft 2 rotates, and the water droplets are larger than at the time of attachment. It becomes. Further, since the enlarged water droplets are easily affected by the centrifugal force, the water droplets collected on the rib 30 are splashed off by the centrifugal force and eliminated. Therefore, in the rotating state of the hub shaft 2, water droplets are prevented from entering the inside of the vehicle bearing device through the flange.

  (2) According to the vehicle bearing device 10 according to the second embodiment, since the rib 30 is formed on the flange portion 6, the rigidity of the flange portion becomes larger than that of the conventional flange portion, and Strength increases.

  In addition, you may change the said embodiment as follows.

  In the vehicle bearing device 10 according to the above-described embodiment, the outer ring 4 is tin-plated on the outer peripheral surface 12a on the outer side in the axial direction, and the sealing device 13a is fitted in the plated portion. However, other configurations may be used. That is, since it is sufficient that rust does not occur at the interface portion between the outer ring 4 and the sealing device 13a, it may be plated with another metal having a rust prevention effect and economically reasonable. It may be coated. The same applies to the inner peripheral surface 12b on the vehicle body side in the axial direction of the outer ring 4.

  In the vehicle bearing device 10 according to the above-described embodiment, the outer ring 4 is tin-plated on the outer peripheral surface 12a on the outer side in the axial direction, and the sealing device 13a is fitted in the plated portion. However, a configuration in which tin plating is not performed may be used. That is, since it is sufficient that rust does not occur at the interface portion between the outer ring 4 and the sealing device 13a, plating can be omitted if there is no probability of entering the interface portion. According to this configuration, the plating process can be omitted, which contributes to cost reduction. The same applies to the inner peripheral surface 12b on the vehicle body side in the axial direction of the outer ring 4.

  In the vehicle bearing device 10 according to the above-described embodiment, the outer ring 4 is tin-plated on the outer peripheral surface 12a on the outer side in the axial direction, and the sealing device 13a is fitted in the plated portion. However, the inner ring member 1 may be plated, and the sealing device 13a may be externally fitted to the plated portion. That is, since it is sufficient that rust does not occur at the interface portion between the fixing member and the sealing device 13a, such a configuration is effective if the inner ring member is a fixing member. The same applies to the inner peripheral surface 12b on the vehicle body side in the axial direction of the outer ring 4.

  The vehicle bearing device 10 according to the above embodiment is applied to a vehicle bearing device in which the fixing member is the outer ring 4 and the rotating member is the inner ring member 1, but the fixing member is the inner ring member, and the rotating member Even if is an outer ring, it is applicable. That is, any vehicle bearing device that protrudes outward in the radial direction of the rotating shaft and has a flange portion 6 for fixing the rotating member to the wheel can be applied.

  The present invention is a vehicle bearing device, particularly a vehicle bearing device in which moisture hardly enters, and can be widely used industrially.

It is drawing explaining one Embodiment of the bearing apparatus for vehicles concerning this invention, and is an axial sectional view of a bearing apparatus. BRIEF DESCRIPTION OF THE DRAWINGS It is drawing explaining one Embodiment of the vehicle bearing apparatus concerning this invention, and is a perspective view of the inner shaft of a vehicle bearing apparatus. It is drawing explaining one Embodiment of the bearing apparatus for vehicles concerning this invention, and is a front view of the inner shaft of a bearing apparatus. It is drawing explaining one Embodiment of the bearing apparatus for vehicles concerning this invention, and is a rear view of the inner shaft of a bearing apparatus. It is drawing explaining one Embodiment of the bearing apparatus for vehicles concerning this invention, and is a top view of the inner shaft of a bearing apparatus. It is drawing explaining one Embodiment of the bearing apparatus for vehicles concerning this invention, and is a bottom drawing of the inner shaft of a bearing apparatus. It is drawing explaining one Embodiment of the bearing apparatus for vehicles concerning this invention, and is a right view of the inner shaft of a bearing apparatus. BRIEF DESCRIPTION OF THE DRAWINGS It is drawing explaining one Embodiment of the bearing apparatus for vehicles concerning this invention, and is a left view of the inner shaft of a bearing apparatus. BRIEF DESCRIPTION OF THE DRAWINGS It is drawing explaining one Embodiment of the vehicle bearing apparatus concerning this invention, and is the perspective view which showed the invention feature part of the inner shaft of the vehicle bearing apparatus with the continuous line. BRIEF DESCRIPTION OF THE DRAWINGS It is drawing explaining one Embodiment of the vehicle bearing apparatus concerning this invention, and is the front view which showed the invention feature part of the inner shaft of the vehicle bearing apparatus with the continuous line. BRIEF DESCRIPTION OF THE DRAWINGS It is drawing explaining one Embodiment of the vehicle bearing apparatus concerning this invention, and is the rear view which showed the invention feature part of the inner shaft of the vehicle bearing apparatus with the continuous line. BRIEF DESCRIPTION OF THE DRAWINGS It is drawing explaining one Embodiment of the vehicle bearing apparatus concerning this invention, and is the top view which showed the invention feature part of the inner shaft of the vehicle bearing apparatus with the continuous line. BRIEF DESCRIPTION OF THE DRAWINGS It is drawing explaining one Embodiment of the vehicle bearing apparatus concerning this invention, and is a bottom drawing which showed the invention feature part of the inner shaft of the vehicle bearing apparatus with the continuous line. BRIEF DESCRIPTION OF THE DRAWINGS It is drawing explaining one Embodiment of the vehicle bearing apparatus concerning this invention, and is the right view which showed the invention feature part of the inner shaft of the vehicle bearing apparatus with the continuous line. BRIEF DESCRIPTION OF THE DRAWINGS It is drawing explaining one Embodiment of the vehicle bearing apparatus concerning this invention, and is the left view which showed the invention feature part of the inner shaft of the vehicle bearing apparatus with the continuous line. It is drawing explaining other embodiment of the bearing device for vehicles concerning the present invention, and is a perspective view of the inner axis of a bearing device for vehicles. It is drawing explaining other embodiment of the bearing device for vehicles concerning the present invention, and is a front view of the inner axis of the bearing device for vehicles. It is drawing explaining other embodiment of the vehicle bearing device concerning this invention, and is a rear view of the inner shaft of a vehicle bearing device. It is drawing explaining other embodiment of the bearing device for vehicles concerning the present invention, and is a top view of the inner axis of a bearing device for vehicles. It is drawing explaining other embodiment of the bearing device for vehicles concerning the present invention, and is a bottom drawing of the inner axis of a bearing device for vehicles. It is drawing explaining other embodiment of the vehicle bearing apparatus concerning this invention, and is a right view of the inner shaft of a vehicle bearing apparatus. It is drawing explaining other embodiment of the vehicle bearing apparatus concerning this invention, and is a left view of the inner shaft of a vehicle bearing apparatus. It is drawing explaining other embodiment of the vehicle bearing apparatus concerning this invention, and is the perspective view which showed the invention feature part of the inner shaft of the vehicle bearing apparatus with the continuous line. It is drawing explaining other embodiment of the vehicle bearing apparatus concerning this invention, and is the front view which showed the invention feature part of the inner shaft of the vehicle bearing apparatus with the continuous line. It is drawing explaining other embodiment of the vehicle bearing apparatus concerning this invention, and is the rear view which showed the invention feature part of the inner shaft of the vehicle bearing apparatus with the continuous line. It is drawing explaining other embodiment of the vehicle bearing apparatus concerning this invention, and is the top view which showed the invention feature part of the inner shaft of the vehicle bearing apparatus with the continuous line. It is drawing explaining other embodiment of the vehicle bearing device concerning this invention, and is a bottom drawing which showed the invention feature part of the inner shaft of the vehicle bearing device with the continuous line. It is drawing explaining other embodiment of the vehicle bearing apparatus concerning this invention, and is the right view which showed the invention feature part of the inner shaft of the vehicle bearing apparatus with the continuous line. It is drawing explaining other embodiment of the vehicle bearing apparatus concerning this invention, and is the left view which showed the invention feature part of the inner shaft of the vehicle bearing apparatus with the continuous line.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Inner ring member, 2 ... Hub axle, 3 ... Inner ring, 4 ... Outer ring, 5a ... Race surface, 5b ... Race surface, 6 ... Flange part, 6a ... Surface where a wheel is attached, 6b ... Opposite to surface where a wheel is attached Surface 7, flange portion 8, small diameter portion 9 a, raceway surface 9 b, raceway surface 10, vehicle bearing device 11 a, rolling element, 11 b, rolling element, 12 a, inner peripheral surface, 12 b, inner peripheral surface , 13a ... sealing device, 13b ... sealing device, 15 ... guide part, 20 ... groove, 21 ... inner wall (of the groove). 22 ... (groove) end, 30 ... rib, 31 ... (rib) side wall, 32 ... (rib) end.

Claims (5)

A vehicle bearing device for supporting wheels,
The vehicle bearing device has a rotating member,
The rotating member has a flange portion,
The flange portion protrudes radially outward from the rotating member, has an annular shape, and is a portion to which the wheel is attached, and has an outer surface, an opposite surface, a drainage structure, and a plurality of inter-groove portions. And
The outer surface indicates a surface to which the wheel is attached in the flange portion,
The opposite surface indicates a surface opposite to the outer surface in the flange portion,
The drainage structure has a function of collecting water droplets adhering to the opposite surface by centrifugal force when the rotating member is rotating, and draining the collected water droplets radially outward of the flange portion. A structure having a plurality of grooves,
The groove is formed on the opposite surface, and is formed from a radially inner portion of the flange portion to a radially outer end portion of the flange portion, and includes a groove inner portion, a groove outer portion, and a groove. Having an intermediate part,
The groove inner portion is formed in a radially inner portion of the flange portion,
The groove outer portion is formed at a radially outer end of the flange portion, and is formed at a location different from the groove inner portion in the circumferential direction of the flange portion,
The groove middle part is formed between the groove inner part and the groove outer part, and has a shape extending while bending from the groove inner part toward the groove outer part,
The inter-groove portion is formed between one of the plurality of grooves and another one of the plurality of grooves,
The width of the groove in the circumferential direction of the flange portion is smaller than the width of the inter-groove portion in the circumferential direction of the flange portion. The flange portion has a plurality of bolt holes,
The vehicular bearing device according to claim 1, wherein the bolt hole is a hole for inserting a bolt that fixes the wheel and the flange portion to each other, and is formed in the portion between the grooves. The groove has a bottom surface, a first side surface, a second side surface, a first boundary portion, and a second boundary portion,
The first side surface has a shape that is continuous with the surface of one of the plurality of inter-groove portions and the bottom surface,
The second side surface has a shape continuous to the surface of another one of the plurality of inter-groove portions and the bottom surface,
The first boundary portion is a boundary portion between the bottom surface and the first side surface, and has a first inner end portion and a first outer end portion,
The second boundary portion is a boundary portion between the bottom surface and the second side surface, and has a second inner end portion and a second outer end portion,
The groove inner portion has the first inner end portion and the second inner end portion,
The groove outer portion has the first outer end portion and the second outer end portion,
The first inner end portion indicates a radially inner end portion of the first boundary portion,
The first outer end portion indicates a radially outer end portion of the first boundary portion, and the second outer end portion side with respect to the first inner end portion in the circumferential direction of the flange portion. Formed in the part of
The second inner end portion indicates a radially inner end portion of the second boundary portion,
The second outer end portion forms a radially outer end portion in the second boundary portion, and the first inner end portion with respect to the second inner end portion in the circumferential direction of the flange portion. The vehicular bearing device according to claim 1, wherein the vehicular bearing device is formed in a portion opposite to the side and in a portion opposite to the first inner end with respect to the first outer end. The vehicle bearing device has an outer ring as a fixed member, and an inner ring member as the rotating member,
The outer ring is formed as a part that supports the rotating member and is fixed to a vehicle,
The inner ring member has a hub shaft and an inner ring,
The hub shaft has a hub shaft main body portion and the flange portion,
The flange portion is formed at an end portion on the outer side in the axial direction of the hub shaft main body portion, and has an outer ring facing portion,
The vehicular bearing device according to any one of claims 1 to 3, wherein the outer ring facing portion constitutes a radially inner portion of the flange portion and faces an end portion on the outer side in the axial direction of the outer ring. . The vehicle bearing device includes a fixing member and a sealing device in addition to the rotating member according to any one of claims 1 to 3, or an outer ring as the fixing member according to claim 4 and In addition to the inner ring member as the rotating member, it has a sealing device,
The sealing device is fitted to the fixing member,
The said fixing member is a component which supports the said rotation member, and is fixed to a vehicle, Comprising: The part to which the said sealing device is fitted is plated. Vehicle bearing device.

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