JP2003039909A - Bearing unit for wheel drive - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To easily connect a wheel supporting bearing unit 1c and a constant velocity joint 2c, and to disassemble for inspection and repair without using special tools. , And at a low cost. SOLUTION: A ring-shaped retaining ring 38a for connecting a wheel supporting bearing unit 1c and a constant velocity joint 2c.
Between the inner diameter side locking groove 42 and the outer diameter side locking groove 43. Of these locking grooves 42 and 43, the inclination angles of the side surfaces that sandwich the retaining ring 38a from both sides in the axial direction are restricted to a range of 0 to 60 ° individually, and a total of 30 to 100 °. With this configuration, by applying a strong force to the spline shaft 17, the above disassembly work can be performed without damaging each part.

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention
The receiving unit consists of a constant velocity joint and a wheel support bearing unit.
And an independent suspension.
Supported drive wheels FF vehicle (front engine front wheel drive vehicle)
Front wheel, FR vehicle (front engine rear wheel drive vehicle) and RR vehicle
Rear wheels (rear-engine rear-wheel drive vehicles), 4WD vehicles (four-wheel drive)
All wheels の of the vehicle) are rotatably supported with respect to the suspension system.
In addition, it is used to rotationally drive the drive wheels. Immediately
In addition, supporting the drive wheels on an independent suspension
In order to rotate this drive wheel, the wheel support bearing unit must be used.
Knit and differential at both ends of drive shaft
Side constant velocity joint and wheel side constant velocity joint
Wheel drive unit combined with constant velocity joint unit
Use a knit. Wheel drive bearings that are the subject of the present invention
The unit is a vehicle that constitutes such a wheel drive unit.
Assembling the wheel support bearing unit and the wheel side constant velocity joint
It is a combination. [0002] Wheels are supported rotatably with respect to a suspension system.
The outer ring and the inner ring in a rotatable manner via rolling elements.
Various types of combined bearing units are used. or,
In addition to supporting the drive wheels on an independent suspension,
Wheel drive bearing unit for rotating this drive wheel
Is combined with a constant velocity joint to
The relative displacement between the gears and the drive wheels and the steering angle given to the wheels.
The rotation of the drive shaft is smooth to the wheels (constant velocity
Must be communicated). Figure 7 shows such an eye
And the wheel supporting bearing unit 1 and the constant velocity joint 2
Shows the combined bearing unit for general wheel drive
ing. [0003] The bearing unit 1 for supporting a wheel includes an outer ring 3.
A hub 4 and an inner ring 5 are provided on the inner diameter side of a plurality of rolling elements 6, 6.
It is rotatably supported via a. Outer ring 3 of these
Is provided by an outward flange-shaped mounting portion 7 provided on the outer peripheral surface thereof.
Knuckle 8 (see FIG. 8 to be described later) constituting a suspension device
It does not rotate during use with it fixed to In addition, above
The outer peripheral surface of the outer ring 3 is simply a circle (without forming the mounting portion 7).
The outer ring 3 is fitted inside the support hole of the knuckle 8
The structure to be defined is also conventionally known. In addition, the outer ring 3
Are provided with double-row outer ring raceways 9 on the inner peripheral surface thereof.
The hub 4 and the inner ring 5 are provided on the inner diameter side of the
It is supported concentrically and rotatably. The hub 4 is located outside the outer peripheral surface (in the axial direction).
About the outside of the width direction of the vehicle when assembled to the car
side. Same throughout this specification. Left side of each figure. ) Edge portion
Is provided with a flange 10 for supporting the wheels.
A first inner raceway 11 is provided at an intermediate portion of the outer peripheral surface of the hub 4.
And the same (with respect to the axial direction,
At the center in the width direction of the vehicle in the mounted state. The same throughout this specification.
Same. Right side of each figure. ) Small diameter step 12 formed near the end
The inner raceway 13 formed on the outer peripheral surface thereof.
The wheel 5 is externally fixed. Also, at the center of the hub 4
Has a spline hole 14. On the other hand, the constant velocity joint 2 is
The outer ring 15 for the int, the inner ring 16 for the constant velocity joint,
And a pline shaft 17. Constant velocity joint
The outer race 15 and the spline shaft 17 form a drive shaft member 18.
Constitute. That is, the spline shaft 17 is
The spline hole 14 is provided in the outer half of the
The outer race 15 for a constant velocity joint is
It is provided in the inner half of the drive shaft member 18. This constant velocity
The outer circumference of the outer ring 15 for connection
The side engagement grooves 19, 19 are
It is formed in the corner direction. Also, the above constant velocity joint 2 is constructed.
The inner ring 16 for a constant velocity joint to be formed
The two spline holes 20 are engaged with the outer
The inner engagement grooves 21, 21 are provided at portions matching the grooves 19, 19.
Are formed at right angles to the circumferential direction.
The inner engagement grooves 21 and 21 and the outer engagement grooves 21
The balls 22, 22 are inserted between the mating grooves 19, 19 and the cage 2.
In the state held by 3, these engagement grooves 21, 19
It is provided to roll freely along. In addition, the above constant velocity joint 2
Regarding the shape of each part of the configuration, etc., a well-known
The same as for the Barfield type constant velocity joint
Since it is not related to the gist of the present invention, a detailed description is omitted.
Abbreviate. The constant velocity joint 2 as described above and the constant velocity joint 2 as described above
The wheel supporting bearing unit 1 includes the spline shaft 17
Into the spline hole 14 of the hub 4 in the axial direction.
Insert from side to outside. And, the spline shaft 17
At the portion protruding from the outer end surface of the hub 4 at the outer end of the hub.
Screw the nut 25 into the male screw part 24 and tighten it further.
To bond and fix each other. In this state, the inner ring 5
Of the outer ring 15 for the constant velocity joint
The inner ring 5 comes out of the small-diameter step portion 12
In any direction. At the same time, each rolling element 6,
6 is given an appropriate preload. [0007] Further, the assembled state of the vehicle to the suspension system
In the above, it is provided at the center of the inner ring 16 for the constant velocity joint.
In the second spline hole 20, provided at the outer end of the drive shaft 26
The male spline portion 27 is engaged with the spline. Soshi
Over the entire outer peripheral surface of the male spline portion 27.
The retaining ring 29 locked in the locking groove 28 formed by
A hook formed at the outer peripheral edge of the outer end of the second spline hole 20
The male spline portion 27 is engaged with the stop
The second spline hole 20 is prevented from falling out. The output of the differential gear is shown in the drawing.
Shows the constant velocity joint on the differential side
However, the inner end of the drive shaft 26 is
A tripod type constant velocity joint that is a Char side constant velocity joint.
Link to the output of the And this tripod
Type constant velocity joint, the drive shaft 26 and the constant velocity joy
2 constitutes the constant velocity joint unit described above.
You. Before assembly to the car, this constant velocity joy
And the wheel support bearing unit 1 are assembled.
Together, they constitute the wheel drive unit described above. Further, US Pat. No. 4,881,842 describes
Describes a wheel drive bearing unit as shown in FIG.
ing. Also in the case of the second example of the conventional structure shown in FIG.
The hub 4 is arranged in a double row inside the outer ring 3 fixed to the knuckle 8.
It is rotatably supported by the arranged rolling elements 6,6.
The spline hole 1 formed in the center of the hub 4
4, the spline shaft 17 of the drive shaft member 18a is spliced.
Engaged. On the outer end face of this spline shaft 17
Pulls the spline shaft 17 into the spline hole 14
A locking portion 31 for locking a tool for inserting is formed.
You. Then, the tip of the outer peripheral surface of the spline shaft 17 (outside)
End) Engagement formed on the near side, forming the inner diameter side engagement part
The groove 32 faces the locking groove 32 on the inner peripheral surface of the hub 4.
Locking step 3 which is an outer diameter side engaging portion provided at a portion
5 and the retaining ring 33, the spline
The shaft 17 is prevented from falling out of the hub 4.
In this state, the inner end surface of the hub 4 and the drive shaft member
18a between the outer end surface of the outer race 15 for a constant velocity joint,
The elastic ring 34 is elastically compressed. In addition, the hub 4 is provided with a
The inner ring 5 having the second inner ring raceway 13 formed on the peripheral surface is externally fitted.
At the same time, at the inner end of the hub 4 from the inner end face of the inner ring 5
Also formed over the entire outer circumference of the part protruding inward in the axial direction
The retaining ring 37 is retained in the retaining groove 36 thus formed. Soshi
With the retaining ring 37, the inner end surface of the inner ring 5 is suppressed.
This prevents the inner ring 5 from shifting in the axial direction. [0011] Such US Pat. No. 4,881,842 mentioned above.
According to the second example of the conventional structure described in the specification,
Coupling work between the permanent bearing unit 1a and the constant velocity joint 2a
Business can be done easily. That is, the conventional structure shown in FIG.
In the case of the first example, the wheel supporting bearing unit 1 and the constant velocity
In order to connect to point 2, male spline shaft 17
The nut 25 is screwed into the spigot part 24 and tightened further.
Work is required. Thus, the wheel support bearing unit
If the connection work between the G1 and the constant velocity joint 2 is troublesome,
A source of high costs for assembling wheel drive bearing units
Cause. Also, the male screw part 24 and the nut 25 are provided.
As a result, the size of the wheel drive bearing unit has increased and the weight has increased.
No. On the other hand, in the case of the second example of the conventional structure described above,
Is a wheel supporting bearing unit 1a and a constant velocity joint 2a.
The inner peripheral surface of the outer end of the hub 4 and the spline
A retaining ring 33 extends between the outer peripheral surface of the shaft 17 and the outer peripheral surface.
Just good. For this reason, in the case of the second example of the conventional structure,
The wheel supporting bearing unit 1a and the constant velocity joint 2a
Work can be easily performed, and the cost required for assembly is low.
It is possible to reduce the size and to reduce the size and weight. However, in the case of the second example of the conventional structure shown in FIG.
, The wheel supporting bearing unit 1a and the constant velocity joint 2a
For easy inspection and repair, etc.
The wheel supporting bearing unit 1a and the constant velocity joint
The work of separating the 2a is troublesome. That is, these wheels
Separating the bearing unit 1a for support and the constant velocity joint 2a
To do this, the spline shaft 17 should be
The retaining ring 33 locked in the formed locking groove 32 is
It is necessary to remove it from the groove 32. This retaining ring 33 is
There is no locking part for removal, so special work
Unless a tool is used, it is difficult to remove it from the locking groove 32.
No. Particularly, the retaining ring 33 is attached to the inner peripheral surface of the spline hole 14.
And the outer surface of the spline shaft 17
When used, the above problem becomes more remarkable. [Description of the Prior Invention] A wheel conceived in view of such circumstances
As a drive bearing unit, a structure as shown in FIGS.
Is disclosed in Japanese Patent Application No. 2000-370492.
I have. Wheel drive according to the prior invention described in FIGS.
In the case of a dynamic bearing unit, a wheel supporting bearing unit
1b and a constant annular joint for connecting the constant velocity joint 2b
At a discontinuous portion of the retaining ring 38, a pair of locking arms 39, 39
Has formed. When disassembling, use general tools such as pliers.
The distance between the pair of locking arms 39, 39 is reduced by
The diameter of the retaining ring 38 is reduced. In this state, the spline
Pull out the shaft 17 from the spline hole 14. Such a structure
By adopting the same as the wheel supporting bearing unit 1b
With a structure that can be easily connected to the speed joint 2b,
Disassembly work for inspection, repair, etc. can be performed without using special tools
Can be done easily. Problems to be Solved by the Invention The points shown in FIGS.
In the case of the wheel drive bearing unit according to the invention, the retaining ring
A pair of locking arms 39, 39 provided at
Since it is necessary to be sandwiched by general tools, the drive shaft part
The locking arms 39, 39 are located at the tip of the material 18b.
It is necessary to form the concave portion 40 in the portion where For this reason,
The above-described structure including the spline shaft 17 by the amount corresponding to the formation of the concave portion 40
Inevitably increases the manufacturing cost of the drive shaft member 18b.
No. The outer peripheral surface of the spline shaft 17 is
When the inner peripheral surface of the line hole 14 is fixed,
Use a pressing device that can apply a large axial load, such as
Although it is necessary to strongly press the spline shaft 17,
Hold the pair of locking arms 39, 39 with the general tool.
The pressing device cannot be used as it is. Departure
In light of these circumstances, Akira has developed a bearing unit for supporting wheels.
The structure allows easy connection with the constant velocity joint.
Without having to increase production costs.
Solution work can be easily performed without using special tools.
Out of the outer peripheral surface of the spline shaft 17 and the spline hole 14
Wheel drive that can perform the above disassembly work even if the peripheral surface is stuck
It has been invented to realize a moving bearing unit. [0016] A wheel driving bearing according to the present invention.
The unit may be a conventional unit shown in FIG.
Same as the wheel drive bearing unit according to the prior invention shown in FIG.
The outer ring, the hub, the rolling elements, the drive shaft member, and the outer diameter side.
An engagement portion, an inner diameter side engagement portion, and a retaining ring are provided. This
The outer ring has a double-row outer ring raceway on the inner peripheral surface.
Also does not rotate. The hub is used to support wheels.
Place the lunge near the outer end of the outer peripheral surface and straighten the first inner raceway.
Spliced at the middle part of the outer peripheral surface through the contact or separate inner ring
Holes at the center and a second hole at the outer peripheral surface.
The inner ring that has formed the inner ring raceway is
It is fitted and fixed. In addition, the rolling elements are in contact with the outer raceways.
Between each of the first and second inner ring raceways,
It is provided so that it can roll freely. Also, the drive shaft member
Is a spline that engages with the spline hole.
The shaft is provided in the outer half, and the inner half is
The outer ring for the constant velocity joint is configured. Also, outside the above
The radial engagement portion is provided on the inner peripheral surface of the hub in a circumferential direction.
I have. Further, the inner diameter side engaging portion is provided outside the spline shaft.
It is provided on the circumferential surface in the circumferential direction. Further, the retaining ring is
It is made of an elastic material and is entirely formed in a partially annular shape.
Part and the outer diameter side engaging part,
This prevents the spline shaft from slipping out of the spline hole.
Stop. Particularly, in the wheel drive bearing unit of the present invention,
In this case, the outer diameter side engaging portion is opposed to the center axis of the hub.
To the diametrical plane that is orthogonal to the outer diameter side.
A flat surface or a mortar that is inclined from 0 to 60 degrees in the direction toward
It is an inclined surface. The inner diameter side engaging portion is
Outer diameter with respect to a virtual plane orthogonal to the center axis of the line axis
0-60 degrees inward in the axial direction toward the side
It is a flat surface or a mortar-shaped inclined surface. And the above
The outer diameter side engaging portion and the inner diameter side engaging portion are directed radially outward.
30-100 degrees inclined to each other in a direction approaching each other
are doing. The wheel drive bearing unit according to the present invention having the above-described structure.
In the knit, the outer diameter side engaging portion and the inner diameter side engaging portion
Toward each other, 30-100
The drive shaft member with respect to the hub in the axial direction.
To the retaining ring by pressing it strongly toward
A force can be applied in the direction of reducing the diameter of the lever retaining ring. Departure
In the clear case, the inclination between the outer diameter side engagement portion and the inner diameter side
Possibility to be added at the time of driving because the angle of inclination is appropriately regulated
With a certain amount of force, the splat
The in-shaft comes out of the spline hole provided in the hub
If there is nothing wrong with the spline,
The shaft can be reliably removed from the spline hole. 1 and 2 show an embodiment of the present invention.
1 shows a first example. The feature of the present invention is that
Work between the bearing unit 1c and the constant velocity joint 2c
Not only separation work, but also without using special tools
A part with a retaining ring 38a for easy operation
The point is that the structure of the minute has been devised. Configuration of other parts and
The operation is almost the same as that of the conventional structure shown in FIGS.
Since they are the same, the same parts are given the same reference
The description of the present invention is omitted or simplified.
The following description focuses on the differences from the conventional structure. In the illustrated example, the wheel supporting bearing unit is used.
Small formed near the inner end of the hub 4a constituting the
A second inner ring raceway 13 is formed on the outer peripheral surface of the step portion 12.
The inner ring 5 is externally fitted. And this inner ring 5 is
To prevent the small diameter step 12 from slipping out,
A caulking portion 41 is formed at the inner end of 4a. That is, on
After the inner ring 5 is externally fitted to the small-diameter step portion 12, the hub 4
a portion protruding from the inner end surface of the inner ring 5 at the inner end of
Plastic deformation outward in the direction to form the caulked portion 41,
The inner end surface of the inner ring 5 is held down by the caulking portion 41.
ing. The splice forming the drive shaft member 18b
The inner diameter side engaging member according to claim 1 is attached to the outer peripheral surface of the outer end portion of the shaft 17.
The inner diameter side locking groove 42 for forming the joint portion is formed over the entire circumference.
Has formed. Connect the spline shaft 17 to the hub 4a.
When inserted into the spline hole 14 provided in the center
Locks the half of the inner diameter side in the inner diameter side locking groove 42.
The outer diameter side half of the retaining ring 38a is connected to the inner periphery of the hub 4a.
The method according to claim 1, wherein the outer surface is formed over the entire periphery at a portion close to the end.
Side of the outer diameter side engaging groove 43 for forming the outer diameter side engaging portion
Abuts or faces the surface. And the above splice
Shaft 17 is axially rattled in the spline hole 14.
To prevent the spline from coming out of the spline hole 14.
Stop. In particular, in the wheel drive bearing unit of the present invention,
In this case, both the inner and outer diameter locking grooves 42 and 43 are used.
Of the side surfaces, the retaining ring 38a is sandwiched from both sides in the axial direction.
A pair of side surfaces, the inner diameter side engaging portion and the outer diameter side engaging portion
A certain axially outward side surface 44 of the inner diameter side locking groove 42,
The inner side surface 45 of the radial locking groove 43 is tilted appropriately.
It is inclined. First, the inner diameter side engaging portion, the inner diameter side
The axially outward side surface 44 of the locking groove 42 is
Outer diameter with respect to a virtual plane Y orthogonal to the central axis of the shaft 17
Inward in the axial direction toward the side
Slopes (Strictly speaking, it is said that the slope is 0 °
However, for the sake of simplicity, the angle of 0 ° is also inclined for convenience.
Expressed as inclined. Same throughout this specification. Let me
I have. This angle α is 0 to 60 degrees (0 ° ≦ α ≦ 60 °)
Then, the side surface 44 is formed as a flat surface or a mortar-shaped inclined surface.
I have. The outer diameter side engaging portion, the outer diameter side locking
The axially inner side surface 45 of the groove 43 is located at the center of the hub 4a.
With respect to an imaginary plane Y orthogonal to the axis,
In the direction toward the outside in the axial direction by an angle β.
You. The angle β is 0 to 60 degrees (0 ° ≦ β ≦ 60 °)
Then, the side surface 45 is formed as a flat surface or a mortar-shaped inclined surface.
I have. Then, the outer side in the axial direction of the inner diameter side locking groove 42.
Surface 44 and the axially inward side surface 45 of the outer diameter side locking groove 43
Are closer to each other as they move radially outward,
At an angle θ (= α + β). In the case of the present invention
Is the angle θ between the two side surfaces 44 and 45.
Is 30 to 100 degrees (30 ° ≦ θ ≦ 100 °)
You. The two side surfaces 44 and 45 are sandwiched between
The retaining ring 38a has a circular cross section made of stainless steel or the like.
By forming a spring steel wire of round shape
And both the inner and outer diameter side locking grooves 42, 43
In the state of being stretched between, the elasticity in the direction to increase the diameter
Granted. Such a retaining ring 38a is connected to the spline
Prior to inserting the shaft 17 into the spline hole 14,
Then, it is mounted in the above-mentioned inner diameter side locking groove 42. Supra above
When inserting the in-shaft 17 into the spline hole 14,
The retaining ring 38a is formed at the inner end opening of the spline hole 14.
Is guided by the guide inclined surface 46 provided on the side
It passes through the spline hole 14 while sexually contracting.
For this reason, the diameter of the groove bottom circle of the inner diameter side locking groove 42 should be
Keep small. And the above-mentioned retaining ring 38a is
The diameter is elastic when aligned with the outer diameter side locking groove 43.
And the retaining ring 38a is connected to the outer diameter as described above.
Between the side locking groove 43 and the inner diameter side locking groove 42.
It is. The outer diameter side locking groove 43 and the inner diameter side locking groove 42
The axial position is at the axial inner half of the drive shaft member 18b.
The outer end face of the outer ring 15 for a constant velocity joint provided and the caulking
Regulate the distance from the inner end surface of the part 41 to an appropriate value.
I have. An opening on the outer end side of the center hole of the hub 4a.
Is closed by a cap 54 (see FIG. 9). Against this
And formed at the base end of the outer ring 15 for a constant velocity joint.
A seal ring 48 is fitted around the outer peripheral surface of the shoulder portion 47.
You. The end of the seal lip of the seal ring 48
The edge is brought into contact with the inner surface of the caulked portion 41 over the entire circumference.
The caulking portion 41 and the outer race 15 for a constant velocity joint
Is closing the gap between them. In the example shown in the figure,
The inner surface of the caulked portion 41
The part where the tip edge of the lip abuts is perpendicular to the center axis.
This seal lip is
It comes into contact with the side surface in a stable state. This
As described above, the cap 54 and the seal ring 48
The spline between the spline shaft 17 and the spline hole 14
Prevent foreign matter such as rainwater from entering the line engagement part
I have. Note that the inside of this spline engagement portion in the axial direction is
The sealing ring to be sealed is not limited to the structure as shown.
In short, the gap between the drive shaft member 18b and the hub 4a
What is necessary is just to close the space over the entire circumference. The wheel driving shaft of the present invention configured as described above
According to the receiving unit, it is the same as the wheel supporting bearing unit 1c.
Connection with the speed joint 2c is performed by the retaining ring 38a.
Therefore, the second example of the conventional structure shown in FIG.
As in the case of the structure according to the prior invention shown in FIG.
Business as well as miniaturization and weight reduction.
You. Moreover, in the case of the wheel drive bearing unit of the present invention,
Can be used for inspection and repair without increasing the production cost.
Hub for the wheel supporting bearing unit 1c
4a and a drive shaft member constituting the above constant velocity joint 2c
18b can be easily separated. The drive shaft member 18b and the hub 4a are connected to each other.
When separating, the hub 4a is pressed down to
The drive shaft member is kept so that a does not displace in the axial direction.
18b is strongly pressed inward in the axial direction (or the drive shaft portion
With the outer end surface of the material 18b held down, the hub 4a is
Direction strongly). This pressing work (or pulling
Work), like a puller, follow a car repair shop, etc.
Pressing device (or pulling device) installed since then
Perform using. The wheel drive bearing unit of this example is
The inside diameter side for clamping the retaining ring 38a from both sides in the axial direction.
The axially outward side surface 44 of the locking groove 42 and the outer diameter side locking groove
The axially inner side surface 45 of 43 faces radially outward.
The hub 4a.
On the other hand, the drive shaft member 18b is strongly pressed inward in the axial direction.
By this, the retaining ring 38a
A force in the direction of reducing the diameter is applied. That is, the side surfaces 44 and 45 and the retaining ring
38a, the respective side surfaces 44,
45 at right angles to each other.
(In the direction perpendicular to the tangent to the outer peripheral surface). Like this
The force applied to each contact portion is within the radial direction of the retaining ring 38a.
There is a component pointing toward it. Then, the drive shaft member 1
8b is pushed inward in the axial direction, and this component force
Becomes larger, the diameter of the retaining ring 38a is reduced,
Pull out the spline shaft 17 from the spline hole 14
Thus, the drive shaft member 18b and the hub 4a can be separated.
You. In the case of the wheel drive bearing unit of the present invention,
Properly regulate the inclination angles of the side surfaces 44 and 45.
With a certain amount of force that may be applied during driving,
The spline shaft 17 comes out of the spline hole 14.
If you do not come out and need it,
Pull out the in-shaft 17 from the spline hole 14 securely.
Can do things. In order to confirm this, the inventor
The following describes the experiment. In the experiment, the inclination angle of each of the side surfaces 44 and 45 was determined.
α and β are changed in steps of 5 ° from 0 to 85 ° respectively.
Then, the spline shaft 17 is connected to the spline hole 14.
The load required to pull out the sample was measured. Line like this
Table 1 below shows the results of the experiment. Table 1
The mark “○” indicates that each part including the retaining ring 38a is damaged.
The spline shaft 17 from the spline hole 14
Can be extracted and the load for extraction is 980
N (100 kgf) or more, those marked “x”
The retaining ring 38a or each of the locking grooves 42 and 43 has been damaged.
Pull out the item without damaging each part.
But the load for extraction was less than 980N.
Are shown respectively. [Table 1] Table 1 shows the results of such an experiment.
The sum of the inclination angles α and β of the side surfaces 44 and 45
The angle θ between these two side surfaces 44 and 45 is 3
If it is 0 ° or more, each part including the retaining ring 38a may be damaged.
The spline shaft 17 from the spline hole 14
I can pull it out. However, the inclination angle of each of the side surfaces 44 and 45
α and β either exceed 60 °, or
The angle θ between both side surfaces 44 and 45 exceeds 100 degrees
Then, the load for extracting is less than 980 N. this
When the load becomes less than 980 N, the spline shaft 17
The load for pulling out from the spline hole 14 is too low
And the load applied by the centrifugal force associated with turning
The spline shaft 17 comes out of the spline hole 14.
May be issued. On the other hand, the range of the above “○” mark
In the case of the present invention using
Pull out the spline shaft 17 from the spline hole 14
And the spline shaft 17 is
Inadvertent escape from the in-hole 14 can be effectively prevented.
You. Next, FIG. 3 shows a second embodiment of the present invention.
An example is shown. In the case of this example, the spline hole 14
The outer diameter side engaging portion according to claim, in a portion near the outer end of the inner peripheral surface.
The locking step 49 is formed. And this clerk
With respect to a virtual plane Y orthogonal to the central axis of the stop 49
Is restricted to a range of 0 to 60 °.
Also, at the outer end of the center hole of the hub 4a,
The portion near the outer end opening is simply a cylindrical surface portion 50.
You. The inner diameter of the cylindrical surface portion 50 is
Above the diameter of the root circle. Configuration of other parts
The effect is as described above, including the restricted range of each angle α, β, θ.
Since it is the same as the case of the first example,
Illustration and explanation are omitted. Next, FIG. 4 shows a third embodiment of the present invention.
An example is shown. In the case of this example, the spline hole 14 is
The female spline teeth that make up are parallel to the central axis.
A spline and a spline shaft 17 are formed.
Twist each male spline tooth slightly inclined with respect to the center axis
It is a spline. Therefore, the spline hole 14
When the spline shaft 17 is retracted into
The female spline teeth and each of the above male spline teeth
Partially, they are fitted with a tight fit of about 5 to 70 μm. In the case of this example, the above spline
A spline engagement portion between the hole 14 and the spline shaft 17
While eliminating rattling, this spline hole 14
The load required to pull in the spline shaft 17 is large.
You. Therefore, in the case of this example, the tip of the spline shaft 17 is
Male thread for screwing the end of the drawing jig onto the end face
51 are protruded. Insert the spline into the spline hole 14.
When pulling in the line shaft 17,
Screw the end of the drawing jig (not shown)
The spline shaft 17 is attached to the spline shaft 17 using a jig.
A strong force in the direction of drawing into the in-hole 14 is applied. Other
The configuration and operation of the parts are the same as those of the first or second example described above.
The description is omitted for the same parts.
You. FIG. 5 shows a fourth embodiment of the present invention.
An example is shown. Also in the case of this example, the case of the third example described above.
Similarly, pull the spline shaft 17 into the spline hole 14
With each female spline tooth and each male spline tooth
With a tight fit of about 5 to 70 μm in a part of the axial direction.
Have been combined. In the case of this example, the spline shaft 17
At the tip of the spline shaft 17
A screw hole 52 is formed. In this spline hole 14
When the spline shaft 17 is pulled in, the screw holes 52
By screwing a pull screw into the spline shaft
17, a strong force in the direction of drawing into the spline hole 14;
Add. The configuration and operation of the other parts
Since it is the same as the case of the three examples, the explanation about the equivalent part
Omitted. FIG. 6 shows a fifth embodiment of the present invention.
An example is shown. In the case of this example, the hub 4b itself has
Does not form a single inner raceway 11, but instead
4b, a first inner raceway 11 is formed on the outer peripheral surface thereof at the center.
The formed inner ring 53 is externally fitted and fixed. Structure of other parts
The composition and operation are the same as those of the first or second example described above.
Therefore, the description of the equivalent parts is omitted. The present invention aims at reducing costs.
In the case where the present invention is carried out, the prior invention shown in FIGS.
It is implemented separately from the structure of However, the wheels are supported even when stuck
The bearing unit for the vehicle and the constant velocity joint on the wheel side are separated.
If the implementation is for the purpose of
It can be implemented in combination with the structure of the invention. This place
If the spline engagement part is not fixed,
Utilizing the structure of the prior invention, a wheel supporting bearing unit and a vehicle
Separate from the wheel side constant velocity joint. On the contrary,
When the spline portion is fixed, the structure of the present invention is used.
The bearing unit for wheel support and the constant velocity
Separate from the point. The bearing unit for driving a wheel according to the present invention has the following features.
Since it is configured and operates as described above, it is compact and lightweight.
And make assembly work easier and reduce costs.
Disassembly work for inspection, repair, etc.
Structure that can be easily performed without cost
Can be realized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a first example of an embodiment of the present invention. FIG. 2 is an enlarged view of a portion A in FIG. FIG. 3 is a view similar to FIG. 2, showing a second example of the embodiment of the present invention; FIG. 4 is a sectional view showing a third example. FIG. 5 is a sectional view showing the fourth example. FIG. 6 is a sectional view showing a fifth example. FIG. 7 is a sectional view showing a first example of a conventional structure. FIG. 8 is a sectional view showing the second example with a part thereof omitted; FIG. 9 is a cross-sectional view illustrating an example of an embodiment of the present invention. FIG. 10 shows a retaining ring and a spline shaft,
The arrow B view of FIG. [Description of Signs] 1, 1a, 1b, 1c Wheel support bearing unit 2, 2a, 2b, 2c Constant velocity joint 3 Outer ring 4, 4a, 4b Hub 5 Inner ring 6 Rolling element 7 Mounting part 8 Knuckle 9 Outer ring raceway 10 Flange 11 First inner raceway 12 Small diameter step 13 Second inner raceway 14 Spline hole 15 Outer race 16 for constant velocity joint Inner race 17 for constant velocity joint Spline shaft 18, 18a, 18b Drive shaft member 19 Outer engagement groove 20 Second Spline hole 21 Inside engagement groove 22 Ball 23 Cage 24 Male screw part 25 Nut 26 Drive shaft 27 Male spline part 28 Lock groove 29 Stop ring 30 Lock step 31 Lock section 32 Lock groove 33 Stop ring 34 Elasticity Ring 35 Locking step 36 Locking groove 37 Retaining ring 38, 38a Retaining ring 39 Locking arm 40 Depression 41 Caulking portion 42 Inner diameter side locking groove 43 Outer diameter side locking groove Four sides 45 sides 46 inclined guide surfaces 47 shoulder 48 the sealing ring 49 engaging step portion 50 cylindrical surface 51 male thread portion 52 screw hole 53 the inner ring 54 the cap

Claims (1)

Claims: 1. An outer ring which has a double row of outer ring tracks on an inner peripheral surface thereof and which does not rotate during use, and a flange for supporting wheels are provided on a portion near an outer end of an outer peripheral surface. One inner ring raceway is provided directly or through a separate inner ring at the intermediate portion of the outer peripheral surface, and a spline hole is provided at the center portion, and the inner ring having the second inner raceway formed on the outer peripheral surface is the inner end of the outer peripheral surface. A hub externally fitted and fixed to the deviated portion; a plurality of rolling elements rotatably provided respectively between the outer raceways and the first and second inner raceways; A drive shaft member having a spline shaft to be combined with the outer half portion and an inner half portion serving as a constant velocity joint outer ring constituting a constant velocity joint, and an outer diameter side provided on an inner peripheral surface of the hub in a circumferential direction. An engaging portion, provided on the outer peripheral surface of the spline shaft in a circumferential direction. The spline shaft is formed in a state where the spline shaft is bridged between the inner diameter side engaging portion and the outer diameter side engaging portion. In the wheel drive bearing unit provided with a retaining ring for preventing the ring from coming out of the hole, the outer diameter side engaging portion is directed to the outer diameter side with respect to a virtual plane orthogonal to the center axis of the hub. It is a flat surface or a mortar-shaped inclined surface inclined from 0 to 60 degrees in the direction toward the outer side in the axial direction. 0 to 6 in the direction toward the inner side in the axial direction toward the outer diameter side.
It is a flat surface or a mortar-shaped inclined surface inclined at 0 degrees, and the outer diameter side engaging portion and the inner diameter side engaging portion are 30 to 100 each other in a direction approaching each other as going outward in the radial direction. A wheel drive bearing unit characterized by a degree of inclination.