JP3991655B2 - Rolling bearing device for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rolling bearing device for a vehicle.
[0002]
[Prior art]
A conventional rolling bearing device for a vehicle is shown in FIG. This includes an outer ring member 61 that is incorporated non-rotatingly through a knuckle 60 on the vehicle body side, and an inner ring member 65 that is rotatably supported by the outer ring member 61 around an axis 64 via two rows of balls 62 and 63. And.
[0003]
The inner ring member 65 is used as an inner ring raceway surface of balls 62 in one row (vehicle outer side) of the inner ring member 65, and protrudes radially outward in the middle of the outer circumferential surface to attach a wheel (brake disc rotor and tire wheel). A hub wheel 67 having a hub flange 66 for this purpose, and a saddle-shaped outer ring member 70 of a constant velocity joint 69 integrally formed with a shaft portion 68 that is spline-fitted into the center hole of the hub wheel 67. The outer peripheral surface of the saddle-shaped outer ring member 70 is used as the inner ring raceway surface of the balls 63 in the other row (vehicle inner side).
[0004]
Further, the shaft portion 68 is formed in a hollow cross section for weight reduction, and the lubricant inside the hook-shaped portion 71 leaks to the outside between the hook-shaped portion 71 of the hook-shaped outer ring member 70 and the shaft portion 68. A lid member 72 for preventing this is fitted.
[0005]
[Problems to be solved by the invention]
In the above conventional rolling bearing device for a vehicle, the load acting on the balls 62 and 63, particularly the balls 63 in the other row is large. For this reason, a large load is applied to the saddle-shaped outer ring member 70. However, as described above, the shaft portion 68 is formed in a hollow cross section for weight reduction. Therefore, there is a possibility that the shaft portion 68 may be distorted as the vehicle travels.
[0006]
Then, this invention aims at provision of the rolling bearing apparatus for vehicles which can solve the said subject.
[0007]
[Means for Solving the Problems]
The problem-solving means in the present invention is an outer ring member that is non-rotatably supported on the vehicle body side, and is supported by the outer ring member so as to be rotatable about an axis via rolling elements of a vehicle outer side row and a vehicle inner side row. An inner ring member, and the inner ring member has a cylindrical inner ring member having an outer peripheral surface as an inner ring raceway surface of a rolling element of the vehicle outer side row and having a mounting flange for mounting a wheel, and an outer peripheral surface is a vehicle inner side. A vertical outer ring member of a constant velocity universal joint which is an inner ring raceway surface of rolling elements in a row and which is rotatably and integrally assembled with the cylindrical inner ring member via a shaft portion which is inserted into the center hole of the cylindrical inner ring member. A rolling bearing device for a vehicle comprising: a radial center line between the rolling elements of at least each of the inner circumferential surfaces of the shaft portion; and a contact angle extension line of the rolling elements of the vehicle inner side row. Within the area surrounded by Support member in the radial direction for supporting the applied load is provided, it is at least the vehicle outer side hollow section of the support member in the shaft portion, the support member, the diameter from the base of the inner peripheral surface of the shaft portion The width in the direction of the axial center is gradually reduced toward the axial center that is the central portion of the direction, and the axial position of the central portion on the vehicle outer side is more than the radial center line between the rolling elements of each row Is also on the vehicle inner side.
[0008]
Thus, along the radial direction within the range surrounded by the radial center line between the rolling elements of each row of the inner peripheral surface of the shaft portion and the contact angle extension line of the rolling elements of the vehicle inner side row The support member is provided, and at least the vehicle outer side of the support member in the shaft portion has a hollow cross section, so that the weight of the shaft portion is not particularly increased and the load load transmitted from the rolling element is received by the support member. Thus, distortion deformation of the shaft portion can be prevented.
[0009]
Also, the support member according to being integrally formed on the inner peripheral surface of the shaft portion, there is no need to provide a special member for supporting a load load transmitted from the rolling elements.
In the rolling bearing device for a vehicle according to claim 1 of the present invention, preferably, the support member is formed of a member different from the shaft portion.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a rolling bearing device for a vehicle according to an embodiment of the present invention will be described based on the drawings. FIG. 1 is a sectional view showing the overall configuration of a rolling bearing device for a vehicle according to a first embodiment of the present invention.
[0011]
The rolling bearing device 1 for a vehicle includes an outer ring member 2 that is assembled non-rotatingly on the vehicle body side, and two rows that are respectively held in the outer ring member 2 at circumferentially equidistant positions by a crown-shaped cage (reference numeral omitted). And an inner ring member 6 that is rotatably supported around an axis 5 via balls (an example of rolling elements) 3 and 4.
[0012]
A support flange 21 projecting radially outward is formed in the middle of the outer peripheral surface of the outer ring member 2, and the outer ring member 2 is not attached to the vehicle body by being coupled to a knuckle incorporated on the vehicle body side. Supported by rotation.
[0013]
The inner ring member 6 has a hub wheel (cylindrical inner ring member) 8 used as an inner ring raceway surface of the balls 3 whose outer peripheral surface is one row (vehicle outer side), and a central hole of the hub wheel 8 via a spline 25. The shaft portion 9 to be inserted is composed of a saddle-shaped outer ring member 10 of a constant velocity joint (constant velocity universal joint) J in which the shaft portion 9 is integrally formed on the vehicle outer side of the saddle-shaped portion 10a.
[0014]
This constant velocity joint J uses what is called a Rzeppa type (Barfield type), and includes the saddle-shaped outer ring member 10, an inner ring portion 51 in which an end portion of the drive shaft 50 is inserted and fixed, and the hub A ball 52 for tilting and guiding the wheel 8 with respect to the drive shaft 50 and its retainer 53 are provided.
[0015]
The hub wheel 8 has a hub flange (mounting flange) 7 projecting radially outward for mounting a wheel (brake disc rotor and tire wheel) in the middle of the outer peripheral surface thereof.
[0016]
Sealing devices 27 and 28 for sealing the annular bearing space 26 between the outer ring member 2 and the inner ring member 6 on both sides in the axial center 5 direction are provided, and the sealing device 27 on the vehicle inner side is provided inside the outer ring member 2. A core metal 29 fitted to the peripheral surface; and an elastic seal body 31 fixed to the core metal 29 and having lip portions that contact the outer peripheral curved surface of the saddle-shaped outer ring member 10 at three locations; The outer periphery of the gold 29 is extended in the direction of the axis 5 (vehicle inner side) to form an extension 32, and is fitted to the outer peripheral surface of the saddle-shaped outer ring member 10 to surround the extension 32 so as to extend. An annular body 33 having a U-shaped cross-section that forms a labyrinth gap with 32.
[0017]
The sealing device 28 on the vehicle outer side is a core metal 29a fitted to the inner peripheral surface of the outer ring member 2, and is fixed to the core metal 29a so as to be continuous from the cylindrical outer peripheral surface of the hub wheel 8 to the wall surface of the hub flange 7. And an elastic seal body 31a having a lip portion in contact with the curved surface portion.
[0018]
A female spline is formed on the inner peripheral surface of the hub wheel 8 over substantially the entire length in the direction of the axis 5, and the male spline is formed on the outer peripheral surface of the shaft portion 9 with the same length as the female spline. The shaft portion 9 is formed and fitted into the hub wheel 8 so that the male spline is press-fitted into the female spline, and the vehicle outer side end portion of the shaft portion 9 is radially expanded outward. By being caulked against the end surface of the hub wheel 8, the saddle-shaped outer ring member 10 and the hub wheel 8 are coupled together around the axis 5 so as to rotate together.
[0019]
In the range surrounded by the radial center line p1 between the balls 3 and 4 in each row and the contact angle extension line p2 of the ball 4 in the other row inside the shaft portion 9, the balls 3 and 4 A support wall (an example of a support member) 35 along the radial direction for supporting the transmitted load is integrally formed on the inner peripheral surface of the shaft portion 9, and the vehicle of the support wall 35 in the shaft portion 9 is provided. The outer side and the vehicle inner side have a hollow cross section (the vehicle inner side of the support wall 35 is cut).
[0020]
Further, the support wall 35 is formed such that the outer diameter side, that is, the width of the base portion 35a (the length in the direction of the axis 5) is the widest, and the width gradually decreases as it approaches the axis 5. The center portion 35b located at the center in the five directions and at the center in the radial direction is formed to have the narrowest width, so that the weight of the rolling bearing device 1 for the vehicle is not increased. In this embodiment, the vehicle outer side of the base portion 35a of the support wall 35 slightly protrudes from the range surrounded by the center line p1 and the contact angle extension line p2, but the substantial support force of the support wall 35 Will not be adversely affected.
[0021]
In the above-described configuration, when a driving force transmission shaft (not shown) is driven, the driving force is transmitted to the saddle-shaped outer ring member 10 (constant velocity joint J), and the hub wheel 8 attached integrally to this is rotated around the axis 5. It rotates and the wheel rotates.
[0022]
By the way, in such a rolling bearing device 1 for vehicles, a big load load acts on the ball | bowl 4 of the other row | line | column especially among the balls | bowls 3 and 4 of both rows. Therefore, when forming the shaft portion 9 of the saddle-shaped outer ring member 10, it is within a range surrounded by the radial center line p1 between the balls 3 and 4 in each row and the contact angle extension line p2 of the balls 4 in the other row. Turning is performed so that the support wall 35 remains. The support wall 35 substantially coincides with a radial surface passing through the center of the balls 4 in the other row.
[0023]
By forming the support wall 35 at such a position, even if a large load is applied to the balls 4 in the other row among the balls 3 and 4 in both rows, the support force of the support wall 35 allows Further, it is possible to prevent the saddle-shaped outer ring member 10 from being distorted, and the balls 3 and 4 can smoothly roll. Further, the shaft portion 9 is left with the support walls 35 and both sides thereof have hollow cross sections, so that the weight of the saddle-shaped outer ring member 10 is prevented from significantly increasing, and thereby the rotational torque of the inner ring member 6 is particularly increased. I don't have to.
[0024]
Further, the support wall 35 can prevent the lubricant in the hook-shaped portion 10a of the hook-shaped outer ring member 10 from leaking to the outside (vehicle outer side).
[0025]
Next, a second embodiment of the present invention will be described based on the sectional view of FIG. A configuration in which the rolling bearing device 1 for a vehicle is different from the rolling bearing device 1 for a vehicle according to the first embodiment will be described. In the rolling bearing device 1 for a vehicle according to the first embodiment, the support wall 35 is formed at a position substantially coinciding on the radial surface passing through the center of the ball 4 in the other row. In the rolling bearing device 1 for a vehicle in the embodiment, the base portion 35a and the center portion 35b on the outer diameter side of the support wall 35 all have a center line p1 in the radial direction between the balls 3 and 4 in each row and the balls in the other row. 4 in that it is located within a range surrounded by the contact angle extension line p2. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.
[0026]
According to this configuration, even if the width of the base portion 35a is made narrower than in the case of the first embodiment, the weight can be reduced without adversely affecting the substantial support force of the support wall 35. it can. Other functions and effects are the same as those of the first embodiment, and thus description thereof is omitted.
[0027]
The present invention is not limited to the above embodiment. For example, in each of the above embodiments, the support wall 35 is formed by turning the inside of the vehicle inner side and the vehicle outer side of the shaft portion 9 to leave a part, but the present invention is not limited to this. That is, the shaft portion 9 is all formed in a hollow cross section (cutting), and is within a range surrounded by the radial center line p1 between the balls 3 and 4 in each row and the contact angle extension line p2 of the other row ball 4. The support wall 35 having the structure according to claim 1, which is as light as possible and has a sufficient support force, and is separate from the shaft portion 9 may be fitted (internally fitted) to the shaft portion 9. . In this case, the same operational effects as those of the above embodiments can be obtained.
[0028]
【The invention's effect】
As is apparent from the above description, the present invention includes an inner ring member that is rotatably supported on the outer ring member that is supported on the vehicle body side via rolling elements of the vehicle outer side row and the vehicle inner side row. A cylindrical inner ring member for mounting a wheel with an inner ring raceway surface of the rolling element on the vehicle outer side row, and an inner ring raceway surface of the rolling element on the vehicle inner side row and being inserted through the center hole of the cylindrical inner ring member A cylindrical inner ring member and a saddle-shaped outer ring member that is assembled together with a cylindrical inner ring member via a shaft portion. A radial center line between rolling elements in each row on the inner peripheral surface of the shaft portion and a vehicle inner side A support member extending in the radial direction is provided within a range surrounded by the contact angle extension line of the rolling elements of the row, and at least the vehicle outer side of the support member in the shaft portion has a hollow cross section. Load that does not increase and is transmitted from rolling elements Is received by the supporting member can be prevented strain deformation of the shaft portion may smoothly performed rolling over the rolling of the moving object in time.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a rolling bearing device for a vehicle showing a first embodiment of the present invention.
FIG. 2 is a sectional view of a rolling bearing device for a vehicle showing a second embodiment of the present invention.
FIG. 3 is a cross-sectional view of a conventional rolling bearing device for a vehicle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rolling bearing apparatus for vehicles 2 Outer ring member 4 Ball 6 Inner ring member 8 Hub wheel 9 Shaft part 10 Ring-shaped outer ring member p1 The center line p2 of the radial direction between the balls of each row The contact angle extension line 35 of the ball of the other row 35a Support wall base 35b Support wall center

Claims (3)

An outer ring member that is supported non-rotatingly on the vehicle body side, and an inner ring member that is supported on the outer ring member so as to be rotatable about an axis via rolling elements of a vehicle outer side row and a vehicle inner side row. The member is a cylindrical inner ring member having a mounting flange for mounting a wheel, the outer peripheral surface of which is an inner ring raceway surface of the rolling element on the vehicle outer side row, and the inner ring raceway surface of the rolling element on the outer side row of the vehicle. And a rolling bearing for a vehicle comprising a cylindrical inner ring member and a saddle type outer ring member of a constant velocity universal joint that is assembled integrally with the cylindrical inner ring member via a shaft portion that is inserted into the center hole of the cylindrical inner ring member. A device,
It is transmitted from the rolling elements within a range surrounded by at least the radial center line between the rolling elements of each row and the contact angle extension line of the rolling elements of the vehicle inner side row on the inner peripheral surface of the shaft portion. A support member is provided along a radial direction for supporting a load load, and at least the vehicle outer side of the support member in the shaft portion has a hollow cross section ,
The support member is formed such that the width in the axial direction gradually decreases from the base on the inner peripheral surface side of the shaft portion toward the axial center that is the central portion in the radial direction, and the axial direction of the central portion on the vehicle outer side A rolling bearing device for a vehicle, characterized in that the position is on the vehicle inner side with respect to the radial center line between the rolling elements of each row . The rolling bearing device for a vehicle according to claim 1, wherein the support member is integrally formed on an inner peripheral surface of the shaft portion. The rolling bearing device for a vehicle according to claim 1, wherein the support member is a member different from the shaft portion.

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