JP4894113B2 - Axle bearing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an axle bearing device for supporting a wheel on a vehicle body.
[0002]
[Prior art]
The basic configuration of a conventional axle bearing device includes a hub shaft provided with a flange for attaching a brake disk rotor extending radially outward on the outer periphery of the vehicle outer side, and a hub shaft that is prevented from coming off from the hub shaft. A double-row rolling bearing that is externally fitted on the outer periphery and rotatably supports the hub shaft with respect to the vehicle body; and a brake disc rotor that is fitted on the outer surface of the flange.
[0003]
By the way, normally, the number of bolt mounting holes provided in the wheel portion of the wheel and the center circle diameter PCD of the bolt mounting holes differ depending on the type of automobile and the manufacturer.
[0004]
Therefore, in the conventional axle bearing device, the brake disc rotor has a structure that can be directly attached to the flange of the hub axle. Therefore, the brake disc rotor has flanges corresponding to different wheel attachment holes depending on the type of automobile and manufacturer. Multiple hub axles must be manufactured.
[0005]
In addition, since this flange needs to secure a sufficient external dimension to hold the brake disc rotor in a stable posture, the outer diameter of the flange of the hub shaft is made as large as possible. For this reason, the deviation between the flange serving as the maximum outer diameter portion and the minimum outer diameter portion is large, and the number of processes when the hub shaft is manufactured by forging increases.
[0006]
[Problems to be solved by the invention]
In the above conventional example, the brake disc rotor has a structure that can be directly attached to the flange of the hub shaft. Therefore, different types of hub shafts must be manufactured on different production lines depending on the type of automobile and manufacturer. In other words, it is pointed out that manufacturing costs and storage costs are expensive.
[0007]
In addition, since it is necessary to increase the outer diameter of the flange portion of the hub shaft, the deviation between the flange and the minimum outer diameter portion increases, and many processes must be repeated when the hub shaft is manufactured by forging. Inevitably, manufacturing costs are inevitable.
[0008]
In view of such circumstances, the present invention provides a structure capable of selectively attaching an attachment of a necessary type for each object to be used to a hub shaft and reducing the manufacturing process of the hub shaft in an axle bearing device. It was adopted.
[0009]
[Means for Solving the Problems]
According to a first axle bearing device of the present invention, as shown in claim 1, a convex portion on the outer periphery of the vehicle outer side is radially outward and the entire surface of the vehicle outer side serves as a clamping contact surface. A hub shaft provided as a maximum outer diameter portion, and a double-row rolling bearing that is externally mounted on the outer periphery of the hub shaft in a region closer to the vehicle inner side than the convex portion and supports the hub shaft rotatably with respect to the vehicle body. an outer fitting attachment mounted in a state in which the brake disc rotor to the surface of the vehicle outer side relative to the vehicle outer side area than the convex portion in the outer periphery and hold the hub axle, the vehicle outer side of the hub shaft attached to and a fastening member for clamping fixing the axial direction the attachment between the convex portion, the attachment is an annular plate which is set in the outer diameter for holding the brake disc rotor to a stable posture Ri, a plurality of bolts for the brake disc rotor and a wheel attached to the circumference several places in outer diameter side position from the convex portion of the annular plate is mounted in a state of being through the axial direction, of the attachment by the bolts brake disc rotor to the surface of the vehicle outer side is integrally rotatably holding the outer diameter dimension of the convex portion is limited to slightly larger than the center hole of the attachment.
[0010]
According to a second axle bearing device of the present invention, as shown in claim 2, in the first aspect, the fastening member is a nut, and the screw shaft portion is provided on the vehicle outer side of the hub axle. Screwed together.
[0011]
According to a third axle bearing device of the present invention, as shown in claim 3, in the first or second aspect, a center hole of the attachment is provided in a vehicle outer side region of the outer periphery of the hub shaft than the convex portion. A centering cylindrical surface to be fitted is provided.
[0012]
According to a fourth axle bearing device of the present invention, in any one of the first to third aspects described above, the brake disk may be disposed on a vehicle outer side region of the outer periphery of the hub shaft rather than the convex portion. A centering cylindrical portion into which the center hole of the rotor is fitted is provided.
[0013]
According to a fifth axle bearing device of the present invention, as shown in claim 5, in any one of the first to fourth aspects described above, a plurality of circumferential positions on the inner diameter side of the attachment are respectively projected along the axial direction. Cut and raised pieces that are cut and raised in a state are provided, and the outer diameter surface of each of the cut and raised pieces is curved so as to circumscribe the central hole of the brake disk rotor.
[0014]
In short, in the present invention, the brake disc rotor and the wheel are not directly attached to the hub axle, but are attached via the attachment, so the necessary type of attachment is selected for the hub axle according to the object of use. It is possible to attach the main components (such as a hub shaft and a double-row rolling bearing) in common, and versatility can be improved. In addition, since it is not necessary to provide a brake disc rotor mounting flange on the hub axle, the deviation between the maximum outer diameter and the minimum outer diameter of the hub axle can be set as small as possible, and the hub axle is manufactured by forging. This makes it possible to reduce the number of processes.
[0015]
The second configuration is limited to a structure using a nut as a fastening member in the first configuration.
[0016]
Moreover, in the said 3rd structure, it can be set as the state centered coaxially with respect to the hub axis | shaft simply by assembling | attaching an attachment simply with respect to a hub axis | shaft.
[0017]
In the fourth configuration, the brake disk rotor can be simply centered coaxially with the hub shaft by simply assembling the brake disc rotor with the hub shaft.
[0018]
Further, the fifth configuration is preferable because the brake disk rotor can be centered only by a simple process of providing a cut and raised piece on the attachment.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, details of the present invention will be described based on embodiments shown in the drawings.
[0020]
1 to 3 show an embodiment of the present invention. 1 is a cross-sectional view of an axle bearing device according to Embodiment 1 of the present invention, FIG. 2 is an exploded cross-sectional view of FIG. 1, and FIG. 3 is an exploded perspective view of FIG.
[0021]
The axle bearing device of the example includes a solid hub shaft 1 and a double row rolling bearing 2 as an example of a rolling bearing, and the brake disc of the disc brake device with respect to the vehicle outer side of the hub shaft 1. The rotor 3 is attached via the attachment 4.
[0022]
The hub shaft 1 has a cylindrical portion 11 along the axial direction on the vehicle inner side, a screw shaft portion 12 on the vehicle outer side, and a flange 13 extending radially outward in the middle of the axial center. Is provided. The flange 13 corresponds to the convex portion described in claim 1.
[0023]
The double row rolling bearing 2 includes a single outer ring 21 having two rows of raceway grooves, a plurality of balls 22 as rolling elements arranged in two rows, two crown-shaped cages 23, and a row of raceways. An inner ring 24 having a groove is provided, and the outer peripheral portion of the enlarged diameter portion 19 provided on the vehicle inner side with respect to the flange 13 in the hub shaft 1 is an inner ring raceway surface. A radially outward flange 25 is provided in the middle of the outer peripheral surface of the outer ring 21 in the axial direction, and this flange 25 is attached to the knuckle 5 which is a part of the vehicle body with a bolt 6.
[0024]
In this embodiment, when the hub axle 1 is manufactured by forging, the flange 13 provided for stabilizing the posture of the brake disc rotor 3 on the outer periphery of the hub axle 1 for the purpose of reducing the number of processes. The outer diameter is made as small as possible, and instead, an attachment 4 for stabilizing the posture of the brake disk rotor 3 is used.
[0025]
The attachment 4 is an annular plate having a center hole 41 through which the hub shaft 1 is inserted at the center thereof, and bolt mounting holes 44 penetrating in the thickness direction are provided at several circumferential positions. . A bolt 72 for fixing the brake disc rotor 3 and the wheel 7 is inserted into the bolt mounting hole 44 in a state in which the rotation is prevented.
[0026]
By the way, normally, the number of bolt mounting holes provided in the wheel portion of the wheel 7 and the center circle diameter PCD of the bolt mounting holes differ depending on the type of automobile and the manufacturer. Therefore, a plurality of types of attachments 4 are prepared for each vehicle type and manufacturer of the automobile to be used for the axle bearing device, and the necessary types of attachments 4 are selected from these, and are attached to and detached from the hub shaft 1. It is preferable that it can be attached as possible. As described above, if the brake disc rotor 3 and the wheel 7 are attached via the attachment 4 without being directly attached to the hub axle 1, a plurality of axle bearing devices having different specifications for each vehicle type or manufacturer can be separately provided. It is not necessary to manufacture on the production line, and versatility can be improved.
[0027]
By the way, since the attachment 4 needs to stabilize the posture of the brake disc rotor 3 as described above, it is preferable that the attachment 4 is made of a high-strength material such as a JIS standard SC material or SPC material. The outer diameter is preferably set to a dimension that allows the outer diameter of the hat of the disk rotor 3 to be loosely fitted.
[0028]
By reducing the ratio of the minimum outer diameter and the maximum outer diameter to, for example, 2.2 or less, the hub shaft 1 can reduce the number of processes when manufacturing the hub shaft 1 by forging, thereby reducing the cost. Leads to.
[0029]
Further, the maximum outer diameter of the flange 13 provided on the hub shaft 1 is limited to be slightly larger than the center hole of the attachment 4 and is set to be equal to or smaller than the outer diameter of the outer ring 21. It is preferable to do this.
[0030]
Next, an assembly form of each component will be described.
[0031]
First, after assembling the double-row rolling bearing 2 to the hub shaft 1, the cylindrical portion on the free end side of the hub shaft 1 (see the two-dot chain line in FIG. 1) is bent radially outward by rolling caulking or the like. Then, the required preload is applied to the double row rolling bearing 2 by caulking against a predetermined portion of the inner ring 24 on the vehicle inner side. This caulking portion is denoted by reference numeral 16.
[0032]
Then, the attachment 4 to which the bolt 72 is attached is applied to the flange 13 from the vehicle outer side. At this time, the attachment 4 is centered by fitting the inner diameter portion 41 of the attachment 4 to the outer peripheral surface of the cylindrical portion 14 provided on the vehicle outer side of the flange 13 in the hub shaft 1. The fitting interference of this part is an intermediate fit.
[0033]
Subsequently, the brake disc rotor 3 is applied to the attachment 4 from the vehicle outer side. At this time, the brake disc rotor 3 is centered by fitting the inner diameter portion 31 of the brake disc rotor 3 to the outer peripheral surface of the cylindrical portion 15 of the hub shaft 1. The fitting interference of this part is a tight fit so that accurate centering can be performed.
[0034]
Thereafter, a flat seat nut 51 is screwed into a screw shaft portion 12 provided on the vehicle outer side of the hub shaft 1, whereby the attachment 4 and the brake disc rotor 3 are sandwiched between the flange 13 and the flat seat nut 51. The attachment 4 and the brake disc rotor 3 are fixed to the hub shaft 1.
[0035]
Thereafter, the wheel 7 is applied to the brake disc rotor 3 from the vehicle outer side, and the brake disc rotor 3 is attached by screwing a nut (not shown) to the bolt 72. The centering of the wheel 7 can be performed by fitting the outer peripheral surface of the seat portion 52 of the seated bolt 51 and the inner diameter portion 71 of the wheel 7.
[0036]
As described above, according to the axle bearing device of the present embodiment, the outer diameter of the flange 13 provided to stabilize the posture of the brake disc rotor 3 on the outer periphery of the hub shaft 1 is made as much as possible. Instead, the attachment 4 for stabilizing the posture of the brake disk rotor 3 is used instead, so that the number of processes can be reduced when the hub shaft 1 is manufactured by forging. The manufacturing cost of the shaft 1 can be reduced.
[0037]
In addition, since the brake disc rotor 3 and the wheels 7 are not directly attached to the hub axle 1 but attached via the attachment 4, a plurality of attachments 4 are provided for each vehicle type or manufacturer of the automobile to be used for the axle bearing device. Select the type of attachment 4 required from these types and attach it to the hub axle 1 in a detachable manner. For multiple axles with different specifications for each vehicle type and manufacturer The bearing device does not need to be manufactured on separate production lines, and versatility can be improved.
[0038]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation and application are possible.
[0039]
(1) In the first embodiment, the example in which the inner ring on the vehicle outer side of the double row rolling bearing 2 is also used as the hub shaft has been described. However, as in the second embodiment shown in FIG. 4, the hub shaft 1 is also used as the inner ring. In addition, the present invention includes a configuration in which a dedicated inner ring 28 is provided also on the vehicle outer side of the double row rolling bearing 2. Further, in the double row rolling bearing 2 of this type, the rolling elements can be replaced with the balls 22 as tapered rollers 22A as in the third embodiment shown in FIG.
[0040]
(2) In the first embodiment, the type used for the driven wheel is given as an example of the bearing device for the axle, but instead, for the type of axle used for the drive wheel as in the fourth embodiment shown in FIG. The present invention can also be applied to a bearing device. The axle bearing device of the illustrated example is different from the structure shown in FIG. 1 in that the hub shaft 1 is hollow. Although not shown, an axle shaft is inserted into and coupled to the hollow portion of the hub shaft 1 through a constant velocity joint.
[0041]
(3) As for the attachment 4 shown in the first embodiment, as in the fifth embodiment shown in FIG. 7, incisions are made at several circumferential positions of the inner diameter portion, and in the form along the axial direction on the vehicle outer side from these notches. A plurality of cut and raised pieces 42 formed by bending 90 ° may be provided. If the outer diameter surface of each cut-and-raised piece 42 is formed in a curved shape and the inner diameter portion 31 of the brake disk rotor 3 is externally fitted by an interference fit, the brake disk rotor 3 is centered. Is preferable.
[0042]
(4) In the first embodiment, the axle bearing device can be attached to the knuckle 5 even when the attachment 4 and the brake disc rotor 3 are attached to the hub shaft 1 as in the sixth embodiment shown in FIG. Devise it so that it can be removed. That is, in the attachment 4, notch portions 45 are provided between the bolt mounting holes 44 provided at several places on the circumference and at positions corresponding to the bolt mounting holes 26 of the outer ring 21. Tool insertion holes 34 are provided between the bolt attachment holes 33 provided at several places on the circumference of the rotor 3 and at positions corresponding to the bolt attachment holes 26 of the outer ring 21. The notch 45 and the tool insertion hole 34 are set to a size sufficient to pass the tool 9 for operating the bolt 6 for attaching the outer ring 21 to the knuckle 5 in a non-contact manner. Thereby, the bolt 6 for attaching the outer ring 21 to the knuckle 5 which is a part of the vehicle body is used from the vehicle outer side by using the tool 9 even when the attachment 4 and the brake disc rotor 3 are attached to the hub axle 1. It is possible to operate and to install and remove the bearing device body.
[0043]
(5) In the first embodiment, the inner ring 24 is prevented from coming off from the hub shaft 1 by caulking. Instead, a plate 53 is used as in the seventh embodiment shown in FIGS. be able to. In this case, the radially outward convex portions 17 are provided at four locations on the outer peripheral surface on the free end side on the vehicle inner side of the hub shaft 1. On the other hand, the plate 53 is an annular plate having a center hole 54 through which the free end on the vehicle inner side of the hub shaft 1 is inserted at the center thereof, and an inner diameter portion of the center hole 54 is formed on the hub shaft 1. A notch portion 55 for inserting the convex portion 17 is provided. Then, the plate 53 is inserted into the free end side of the hub axle 1, and this plate 53 is rotated by 45 ° in the circumferential direction in a state where it is applied to the vehicle inner side end surface 29 of the inner ring 24. The distance between the end surface 29 and the vehicle outer side end surface 18 of the convex portion 17 is set to be equal to the thickness of the plate 53. In such a form, a required preload can be applied to the double row rolling bearing 2 by tightening the flat seat nut 51. Of course, the number of the convex parts 17 and the notch parts 55 is not limited to four.
[0044]
(6) In Embodiment 1 described above, the flange 13 has a shape that is continuous in the circumferential direction. Included.
[0045]
【Effect of the invention】
In the bearing device for an axle according to the first to fifth aspects of the present invention, the brake disc rotor and the wheel are not attached directly to the hub axle but attached via an attachment. Depending on the number of screw holes and the center circle diameter PCD, multiple types of attachments are prepared. From these, you can select the required types of attachments and attach them detachably to the hub axle. Main components (hub shafts, double row rolling bearings, etc.) can be shared, and versatility can be improved. In addition, since it is not necessary to manufacture a plurality of hub shafts that differ depending on the vehicle type or manufacturer of the vehicle on separate production lines, it is possible to reduce the manufacturing cost and storage cost of the hub shaft.
[0046]
In addition, since the protruding dimension of the convex portion, which is the maximum outer diameter portion of the hub shaft, is set as small as possible with respect to the minimum outer diameter portion, the number of processes is reduced when the hub shaft is manufactured by forging. Therefore, the manufacturing cost of the hub shaft can be reduced.
[0047]
In particular, according to the second aspect of the present invention, the nut screwed to the screw shaft portion provided on the vehicle outer side of the hub shaft from the axial direction between the attachment and the convex portion provided with the brake disk rotor on the hub shaft is provided. Since the structure of using and pinching is employed, the attachment and the brake disc rotor can be securely attached to the hub shaft by a relatively simple fastening means called nut screwing.
[0048]
According to the third aspect of the present invention, since the attachment can be easily centered coaxially with the hub shaft by simply assembling the attachment to the hub shaft, the attachment work of the attachment is simplified. This is preferable.
[0049]
In the invention of claim 4, since the brake disk rotor can be easily centered coaxially with the hub shaft by simply assembling the brake disk rotor with respect to the hub shaft, This simplifies the mounting operation and is preferable.
[0050]
Further, the invention of claim 5 is preferable because the brake disk rotor can be centered only by a simple process of providing a cut and raised piece on the attachment.
[Brief description of the drawings]
1 is a cross-sectional view of an axle bearing device according to Embodiment 1 of the present invention. FIG. 2 is an exploded cross-sectional view of FIG. 1. FIG. 3 is an exploded perspective view of FIG. FIG. 5 is a sectional view of an axle bearing device according to Embodiment 3 of the present invention. FIG. 6 is a sectional view of an axle bearing device according to Embodiment 4 of the present invention. Fig. 8 is an exploded perspective view of an axle bearing device according to Embodiment 5 of the present invention. Fig. 8 is an exploded perspective view of an axle bearing device according to Embodiment 6 of the present invention. Fig. 9 is an axle perspective device according to Embodiment 7 of the present invention. FIG. 10 is an exploded perspective view showing the main part of FIG. 9. FIG. 11 is a perspective view showing a state where the plate of FIG. 10 is assembled.
1 Hub shaft 2 Double row rolling bearing 3 Brake disc rotor 4 Attachment 7 Wheel

Claims (5)

A hub shaft provided with a convex portion as a maximum outer diameter portion on the outer periphery of the vehicle outer side that is radially outward and the entire surface of the vehicle outer side is a contact surface for clamping ;
A double-row rolling bearing which is externally mounted on the outer periphery of the hub shaft in a region closer to the vehicle inner side than the convex portion and supports the hub shaft rotatably with respect to the vehicle body;
An outer fitting attachment mounted in a state in which the brake disc rotor to the surface of the vehicle outer side relative to the vehicle outer side area than the convex portion in the outer periphery and hold the hub shaft,
A fastening member that is attached to the vehicle outer side of the hub axle and clamps and fixes the attachment with the convex portion from an axial direction;
The attachment comprises an annular plate set to an outer diameter dimension that holds the brake disc rotor in a stable posture, and the brake disc rotor and wheels are mounted at several circumferential positions on the outer diameter side of the convex portion of the annular plate . A plurality of bolts are attached in a state of being penetrated in the axial direction, and the brake disc rotor is held by the bolts on the surface of the attachment on the vehicle outer side so as to be integrally rotatable.
The outer diameter dimension of the convex portion, a bearing apparatus for an axle and wherein the restricted to slightly larger Iruko than the center hole of the attachment. The axle bearing device according to claim 1,
The axle bearing device, wherein the fastening member is a nut and is screwed to a screw shaft portion provided on a vehicle outer side of the hub shaft. The axle bearing device according to claim 1 or 2,
An axle bearing device, characterized in that a centering cylindrical surface into which a center hole of the attachment is fitted is provided in a vehicle outer side region of the outer periphery of the hub shaft from the convex portion. The axle bearing device according to any one of claims 1 to 3,
An axle bearing device, wherein a centering cylindrical portion into which a center hole of the brake disc rotor is fitted is provided in a vehicle outer side region of the outer periphery of the hub shaft from the convex portion. The axle bearing device according to any one of claims 1 to 4,
Cut and raised pieces that are cut and raised so as to protrude along the axial direction are provided at several positions on the inner diameter side of the attachment, and the outer diameter surface of each cut and raised piece is the brake disk rotor. An axle bearing device having a curved shape so as to circumscribe the center hole of the shaft.

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