JP2003002005A - Bearing unit for drive wheel for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure sufficient durability and to suppress the occurrence of abnormal sound or vibration, even when joining and fixing an inner wheel 25 to a hub 3a by a caulking part 9 disposed at the inner end of the hub 3a. SOLUTION: A columnar part 28 is disposed in a portion of part of a spline shaft 14a disposed in a drive shaft member 13a and spaced from a male spline part 20 axially inwardly. A cylindrical part 10 disposed at the inner end of the hub 3a is engaged with the outside of the columnar part 28 by fastening engagement. Various teeth constituting the male spline part 20 are formed in the tilting direction with respect to the center axis of the spline shaft 14a. Both axial ends of a female spline part 19 disposed in the inner peripheral surface of a spline hole 12 and the male spline part 20 are inter-engaged with a fastening allowance related to the circumferential direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention
Receiving unit integrates constant velocity joint and hub unit
What is called a fourth-generation hub unit
And the driving wheel ｛F supported by the independent suspension type suspension
Front wheel of F car (front engine front wheel drive car), FR car (front
Engine rear wheel drive vehicle and RR vehicle (rear engine rear wheel drive)
4) All rear wheels of 4WD (four-wheel drive) vehicles
The drive wheels are supported rotatably with respect to the
Is used to rotationally drive. [0002] 2. Description of the Related Art 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 combined axle 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). Such a constant velocity joy
Combined with a compact, lightweight and relatively compact
Wheel drive, a so-called fourth generation hub unit
Conventionally, as a dynamic bearing unit, it has been disclosed in Japanese Utility Model Application Laid-Open No. 61-944.
03, JP-A-7-317754, U.S. Pat.
No. 4,881,842 or US Pat.
No. 11 is known. FIG. 11 shows a U.S. Pat.
11 shows an example of the conventional structure described in the specification of Japanese Patent No. 011.
You. The nuts that make up the suspension
Outer ring 1 that does not rotate when used while being fitted and fixed in wheel 5
Are provided with double-row outer raceways 2 on the inner peripheral surface thereof. Up
The hub 3 is supported inside the outer ring 1 concentrically with the outer ring 1.
are doing. This hub 3 is provided at the axially outer end of the outer peripheral surface (automobile
At the end that is outside in the width direction when assembled to
5-12) Left side mounting brackets to support wheels
A flange 4 is provided. Also, the middle of the outer peripheral surface of the hub 3
A first inner raceway 6 formed on the outer peripheral surface of the
The inner ring 7a is also attached to the inner end of the
1 to 2 and 5 to 12
End) A second inner ring raceway 8 is formed on the outer peripheral surface at the nearer part
The respective second inner rings 7b are externally fitted. Soshi
The inner end surface of the second inner ring 7b is
By pressing down on the caulking section 9 provided in the section,
11 and one side of the base end of the mounting flange 4 (FIG. 11)
Between the inner rings 7a and 7b with the right side).
The inner rings 7a and 7b are connected and fixed to the hub 3.
The caulking portion 9 is provided at a portion near the inner end of the hub 3.
Of the cylindrical portion 10, the inner end surface of the second inner ring 7b
Plastic deformation of the protruding part outward in the diameter direction
It is formed by. In addition, each of the outer raceways 2, 2 and
Between the first and second inner ring raceways 7a, 7b, respectively
A plurality of rolling elements 11, 11 are provided so as to freely roll, and
The hub 3 is rotatably supported inside the outer ring 1.
You. A spline is provided at the center of the hub 3.
A hole 12 is formed. And drive with such a hub 3
Bearing unit for driving a wheel by combining with a shaft member 13
Is composed. The outer end of the drive shaft member 13 has
Female spline portion formed on the inner peripheral surface of the spline hole 12
The male spline portion 20 which is spline-engaged with the
A spline shaft 14 is provided on the peripheral surface. Also this
The inner end of the drive shaft member 13 is a
Housing part 1 to be the outer ring of the cold type constant velocity joint
5 is assumed. On the inner peripheral surface of the housing part 15,
The outer track 16 of the constant velocity joint is formed. or,
Between the male spline section 20 and the housing section 15
Are connected by a cylindrical portion 21 having a cylindrical outer peripheral surface.
I have. Further, the outer peripheral surface of the cylindrical portion 21 and the housing portion 1
5 between the outer end face and a circular arc with a sufficiently large radius of curvature
The shape is continuous by a curved surface portion 22. [0005] Such a drive shaft member 13 and the hub 3
Inserts the spline shaft 14 into the spline hole 12
It is combined with the state that entered. And means for retaining
And an elastic material that engages with the two members 13 and 3 unevenly.
The spline shaft 14 is moved by the connecting member 17 made of
It is prevented from getting out of the spline hole 12. still,
A part of the coupling member 17 is made of a magnetic material or a permanent magnet.
With the encoders 18 and 18 attached, the two members 13 and 3
Rotation speed can be detected. The wheel drive bearing unit constructed as described above
When assembling the vehicle into the vehicle, insert the outer ring 1 into the knuckle 5
The driving wheel is fixed to the hub 3 by the mounting flange 4.
Fix it. Also, through the transmission by the engine
The outer end of the drive shaft (not shown)
For constant velocity joints provided on the inner diameter side of the housing part 15
Spline engagement is performed on the inner diameter side of the inner ring (not shown). Self
When the vehicle is running, the rotation of the inner ring for this constant velocity joint
Through a plurality of balls and the housing portion 15
And transmitted to the spline shaft 14.
The driving wheels fixed to the hub 3 are driven to rotate.
You. [0007] Wheel drive bearing constructed and operated as described above.
In the case of a unit, the connection of each inner ring 7a, 7b to the hub 3
The fixing is performed by the caulking portion 9 provided at the inner end of the hub 3.
I am doing it. For this reason, for example,
When using a member separate from the hub 3 such as
In comparison, the number of parts can be reduced, and the cost can be reduced. [0008] SUMMARY OF THE INVENTION In the conventional structure as described above,
In this case, both miniaturization and weight reduction and sufficient durability
It is difficult to plan. The reason will be described below. Up
In the case of the conventional structure described above, the caulking portion 9 is provided at the inner end of the hub 3.
To form the hub 9, a cylindrical portion 10
Is provided. The inner diameter of the cylindrical portion 10 is
Root circle of female spline portion 19 provided on the inner peripheral surface of pin hole 12
By making the diameter larger than the diameter of
I'm making it smaller. And, in this way, the thickness of the cylindrical portion 10 is reduced.
By reducing the size, it is necessary to form the caulked portion 9
When forming the caulked portion 9 while reducing the force
The load applied to the inner end of the hub 3 is a circumferentially extending meat.
The thickness change is large.
To prevent damage such as cracks in this part.
You. Further, it is added when forming the caulking portion 9.
The load is sufficiently prevented from being applied to the female spline section 19.
The entire length of the cylindrical portion 10 should be sufficiently large so that it can be stopped.
ing. Accordingly, the inner peripheral surface of the cylindrical portion 10 and the inner peripheral surface
Between the surface and the outer peripheral surface of the drive shaft member 13 facing the surface
As shown in FIG. 11 unless otherwise considered.
The inner peripheral surface of the cylindrical portion 10 and the drive shaft member 13
Comparatively large between the outer peripheral surface of the cylindrical portion 21 provided in the intermediate portion
A simple space 23 is formed over the entire circumference. On the other hand, during operation of the wheel drive bearing unit
And constant velocity joints of the Zeppa or Barfield type
And the housing part 15 which becomes the outer ring of the same
The center axis of the inner ring for the speed joint is inconsistent
State (shaft intersection angle is not 180 degrees), this constant velocity joy
When the driving force (torque) is transmitted through the
Radial load generated in the constant velocity joint
The drive shaft member 13
Bending moment acts. And the bending mode
Even in the case of the conventional structure described above,
Are located outside the inner peripheral surface of the cylindrical portion 10 and the drive shaft member 13.
Because there is a relatively large space 23 between the peripheral surface and
Other than the male spline portion 20 of the drive shaft member 13
The portion does not contact the inner peripheral surface of the hub 3. For this reason, the bending acting on the drive shaft member 13
The distribution of the bending moment is as shown in FIG. example
In this case, the inner end of the drive shaft member 13 is indicated by an arrow in FIG.
Bending moment M₀ Assuming that
In the case of the conventional structure described above, the male spline section 20
Position of the spline engaging portion between the female and the female spline portion 19
The outer peripheral surface of the drive shaft member 13 at points A and B
Contacts the inner peripheral surface of the hub 3 (FIG. 11). And
These points A and B have a size of F_A And F_B
Are acting in opposite directions. Because of this,
The drive shaft member 13 includes the inner end of the drive shaft member 13.
From the cross section of the
The male spline portion 2 over the cross section including the point A
0 on the step portion 24 between the outer peripheral surface of the cylindrical portion 21
Bending moment acting on the drive shaft member 13 including the point C
Maximum value M₀ Work equally well. On the other hand, rotation of the drive shaft member 13 is
With the transmission to the drive shaft 3, the drive shaft member 13
The torque acts on this drive shaft member
A large stress is generated in the cross section of No. 13. This drive shaft member 13
Among the above, the cylinder deviated from the male spline portion 20
The part 21 is provided with all the torques to be transmitted by the drive shaft member 13.
Since the torque is applied, the stress generated in the cross section also increases. This
As a result, the shape of the drive shaft member 13 is
The point C on the step portion 24 where the force is easily concentrated is the strongest.
Is a part that tends to run short. Therefore, it acts on this point C.
If the bending moment can be kept small, wheel drive
The durability of the entire bearing unit can be ensured. On the other hand,
Increasing the diameter of the spline shaft 14 constituting the drive shaft member 13
In this way, the strength of the cross section including the point C can be increased.
It is conceivable, but in this case, the wheel drive bearing unit
Is preferable because it may cause the size to increase or increase the weight.
I don't. [0013] [Description of Prior Invention] A wheel invented in view of such circumstances.
Driving bearing unit becomes Japanese Patent Application No. 2000-15383.
It has been disclosed. Bearing unit for wheel drive according to the prior invention
The shaft is installed on the outer peripheral surface of the spline shaft among the drive shaft members.
A circle is drawn in the part that deviates axially inward from the male spline part.
The columnar part faces the outer peripheral surface of this columnar part at the inner end of the hub.
The cylindrical portions are provided in the portions where they do. And
With the use of wheel drive bearing units, constant velocity joints
The outer ring of the housing and the inner ring
The center axis of the inner ring for the point
From this inner ring for constant velocity joints to the housing
When a torque greater than the specified value is applied, the cylinder
Part of the outer peripheral surface of the cylindrical part corresponds to part of the inner peripheral surface of the cylindrical part.
I'm touching. [0014] Such a wheel drive bearing unit according to the prior invention.
According to the kit, the fixing of the inner ring to the hub is
Even if it is performed by a swaged part provided at the inner end of the
In use, the strength is most likely to be insufficient among the drive shaft members.
The bending moment acting on the part can be kept small
As a result, sufficient durability can be ensured. Moreover, the above-mentioned Supra
Since it is not necessary to make the diameter of the inner shaft particularly large, wheels
The drive bearing unit must be large and heavy.
There is no. However, the wheel drive bearing unit according to the above-mentioned invention is provided.
In the case of knit, the housing that becomes the outer ring of the constant velocity joint
And the center of the inner ring for the constant velocity joint, which is also the inner ring
Even if the axes do not match, this constant velocity joint
A torque of a specified size or more from the inner ring to the housing
If no cracks are applied, the outer peripheral surface of the
There is a possibility that it does not come into contact with the inner peripheral surface of the cylindrical portion. And
In this case, the above-mentioned how
When a torque larger than the specified value is applied to the jig
In addition, the outer peripheral surface of the cylindrical portion is stronger than the inner peripheral surface of the cylindrical portion.
May collide. And in this case this
The collision generates harsh noises (metallic sounds) or vibrations
You. Also, the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the cylindrical portion
In addition, fretting based on the collision may occur
is there. Further, the wheel drive bearing unit according to the above invention is provided.
In the case of a slot, a male sleeve formed on the outer peripheral surface of the spline shaft is used.
On each tooth that constitutes the ply section and on the inner peripheral surface of the spline hole
Circumferential direction with each tooth constituting the formed female spline part
Between the sides facing each other with respect to
(Torque is not transmitted between the pipeline shaft and the hub.)
Therefore, a minute gap may be generated. In this case,
When the vehicle accelerates or decelerates, the relative change between the two splines
By colliding the sides of each tooth based on the position,
Unpleasant rattles may occur, or the male and female splices
Rattling may occur in the spline engagement part consisting of
There is. The wheel drive bearing unit of the present invention has the above-described configuration.
The inner ring to the hub in the same manner
Sufficient durability even when performed by crimping parts provided in
In the structure according to the above-mentioned invention, and
It was invented to solve the problem of sound generation. [0017] A bearing for driving a wheel according to the present invention.
The unit is the same as that of the conventional structure shown in FIG.
Similarly, the outer ring, the hub, the plurality of rolling elements, and the drive shaft member
And retaining means. The outer ring is the inner circumference
It has a double-row outer ring raceway on its surface and does not rotate when used.
The hub supports the wheel at a portion of the outer peripheral surface near the outer end.
Mounting flange directly or separately at the middle part
The first inner ring raceway through the inner ring, the spline hole in the center
Are provided respectively. At the same time, the hub
A second inner ring raceway is provided on the outer peripheral surface near the inner end of the peripheral surface.
The formed inner ring is fitted outside. Also, each rolling element above
Between the outer raceway and the first and second inner raceways.
It is provided movably. Further, the drive shaft member is
When the spline shaft that engages with the line hole is provided at the outer end,
In addition, the housing part whose inner end is the outer ring of the constant velocity joint
And Further, the retaining means is provided on the drive shaft portion.
The spline shaft is provided between the material and the hub,
It is prevented from getting out of the spline hole. Soshi
At the inner end of the hub, near the inner end of the outer peripheral surface of the hub.
The part protruding from the inner end surface of the inner ring
The inner ring is formed by a caulking part that is plastically deformed outward in the direction.
And fix the inner ring to the hub
are doing. Particularly, in the wheel drive bearing unit of the present invention,
In this case, the spline shaft is a part of the drive shaft member.
Axially inward of the male spline section provided on the outer peripheral surface of
And the inner end of the hub
It is installed on the inner peripheral surface of the
It is fitted around the columnar part with
Cylindrical portion. Along with this, the above male spline
Part and a female sprag formed on the inner peripheral surface of the spline hole.
Each of the teeth that make up one of the spline sections
Inclined with respect to the center axis of the spline shaft and spline hole
In the direction that the other spline part is
Parallel to the center axis of the spline hole and spline shaft,
Each is formed. And both male and female splines
Part of the parts fit together with a margin in the circumferential direction
Have been. [0019] The wheel drive bearing unit according to the present invention having the above-mentioned structure is provided.
According to the knit, the connection and fixing of the inner ring to the hub
Even when performing caulking at the inner end of the hub,
The part of the drive shaft member where strength is most likely to be insufficient during use
The bending moment acting on the surface can be kept small.
In use, the outer peripheral surface of the cylindrical portion provided on the drive shaft
It may collide with the inner peripheral surface of the cylindrical portion provided on the hub,
Prevents the teeth that make up the spline from colliding with each other
Wear. Therefore, according to the present invention, the structure of the prior invention described above is provided.
In addition to ensuring sufficient durability than the case of,
The generation of harsh noises and vibrations can be suppressed. [0020] 1 to 5 show an embodiment of the present invention.
1 shows a first example. The feature of the present invention is that the hub 3a
Of the inner ring 25 to the inner end of the hub 3a.
Sufficient durability even when performed by crimping section 9
Performance, and to prevent unpleasant noise and vibration
In order to suppress, the structure of the drive shaft member 13a and a part of the hub 3a is
The point is that it was devised. Configuration and operation of other parts
Is almost the same as the conventional structure shown in FIG.
Equivalent parts are denoted by the same reference numerals, and duplicate descriptions are omitted.
In the following, the characteristic portions of the present invention and the above-described conventional
The following description focuses on the differences from the structure. In the case of this example, a knuckle constituting a suspension device
The outer ring 1 that does not rotate while being supported by the
Forming a coupling flange 26 for supporting the knuckle 5
I have. The second inner raceway 8 is formed on the outer peripheral surface.
The wheel 25 is formed on a small portion formed on the outer peripheral surface near the inner end of the hub 3a.
At the same time, it is fitted to the outer diameter of the diameter step 27 and is attached to the inner end of the hub 3a.
From the inner end surface of the inner ring 25 of the formed cylindrical portion 10
The plastically deformed protruding part diametrically outward?
It is connected and fixed to the hub 3a by the tightening portion 9.
You. Further, the first inner raceway 6 is located outside the intermediate portion of the hub 3a.
It is formed directly on the peripheral surface. In the case of this embodiment, the wheel drive bearing unit
The rotation speed detector is combined with the
It is possible to freely detect the rotation speed of the fixed wheel. For this
In the case of the present example, the inner ring 25 has
The coder 31 is externally fitted and fixed. This encoder 31
Is a cored bar 32 having an L-shaped cross section and formed entirely in an annular shape;
An end fixed to the side surface of the annular portion 33 constituting the metal core 32
And a permanent magnet 34. Also, this permanent magnet 34 is
Direction, and change the magnetization direction with respect to the circumferential direction.
The values are changed with each other and at equal intervals. Therefore, this permanent magnet
On the inner surface of the stone 34, an S pole and an N pole are arranged in the circumferential direction.
Are present alternately and at equal intervals. Also under the knuckle 5
At the end, an insertion hole penetrating the inner and outer peripheral surfaces of this knuckle 5
35 are formed. Then, a sensor is inserted into the insertion hole 35.
The tip of the unit 36 is positioned radially outward of the knuckle 5
Inserted from inside. This sensor unit 36
The rotation speed sensor is held in a synthetic resin holder.
You. This rotation speed sensor is a magnetoresistive element, a Hall element
Such as changing the output in response to changes in the direction of the magnetic flux
Use Such a sensor unit 36 has a tip
Part is inserted into the insertion hole 35, and
The flange 37 is connected to the outer peripheral surface of the outer race 1 with bolts.
The outer ring 1 is fixed to the outer ring 1 by joining. And
In this state, the rotation speed sensor supported by the tip of the holder
The sensor detector is attached to the inner surface of the encoder 31
Facing. The output taken from the rotation speed sensor
The force signal is output from a connector provided at the base end of the sensor unit 36.
A harness (not shown) having one end connected to the connector 38
And also sent to a controller (not shown) to rotate the wheels.
It is used for controlling speed. In particular, the wheel drive bearing unit of the present invention
In this case, a splice provided at the outer end of the drive shaft member 13a
Of the spline shaft 14a.
More axially inward than the male spline section 20 provided on the outer peripheral surface
The columnar portion 28 is provided in the off part. Also this circle
Between the outer peripheral surface of the columnar portion 28 and the male spline portion 20
Direction in which the outside diameter increases inward in the axial direction
The taper surface portion 29 is inclined so as to be continuous. Change
And a state in which a caulked portion 9 is formed at the inner end of the hub 3a.
The shape is closer to the female spline part 19 than this caulked part 9
Base half of the cylindrical part 10 to be formed (left half of FIGS. 1 and 2)
Is the cylindrical portion described in the claims, the cylindrical portion 10
A part of the inner peripheral surface is formed on a part of the outer peripheral surface of
Outside by a tight fit with a predetermined interference of about 30μm
It is fitting. Further, in the case of the present example, the cylindrical portion 28
Grease holding grooves 30 and 3 at a plurality of locations on the outer circumferential surface in the circumferential direction.
0 with respect to the center axis of the cylindrical portion 28,
The circumference of the cylindrical portion 28 between the lease holding grooves 30, 30.
It is formed so as to be inclined in the same direction.
Also, the inner end of each of the grease holding grooves 30, 30 in the axial direction.
The inner part of the caulking part 9 and the base of the columnar part 28
Facing the annular space 39 existing between the end outer peripheral surface
I have. Further, in the case of the present invention, the spline
Male spline portion 20 formed on the outer peripheral surface of the first half of shaft 14a
To the center axis of the spline shaft 14a.
On the other hand, these teeth are connected to the circumference of the spline shaft 14a.
Slightly (for example,
The twist angle (about 10 minutes with respect to the axial direction) is given. This
On the other hand, each tooth constituting the female spline portion 19
Are formed parallel to the central axis of the spline hole 12.
You. Each tooth constituting the male spline section 20 is located on the upper side.
The above described outer peripheral surface of the spline shaft 14a is formed by rolling.
After forming into a shape with a twist angle like
The surface is hardened by performing a filling process or the like.
On the other hand, each tooth constituting the female spline portion 19
Performs broaching on the inner peripheral surface of the spline hole 12.
After being formed into a predetermined shape,
I have left. And, among the spline holes 12,
With the spline shaft 14a inserted into the
Spline the spline 19 and the male spline 20
The male and female spline portions 20, 19 are engaged with each other.
Between the axially opposite ends in the circumferential direction,
The fitting is performed with a predetermined interference of about 70 μm. In the case of this embodiment, the spline shaft 1
A screw hole 40 is formed in the center of the distal end surface of 4a. Up
Insert spline shaft 14a into spline hole 12 as described above
At this time, a stud (not shown) is screwed into the screw hole 40.
And tighten. And of these studs,
A nut member (not shown) is
And screw the nut member to the inner end surface of the hub 3a.
Make contact with the surface. Then, in this state, this nut member
To pull the studs axially outward.
Thus, the spline shaft 14 is inserted into the spline hole 12.
Pull in a. Regarding this point, Japanese Patent Application No. 2001-1
No. 49872 and related to the gist of the present invention.
Therefore, detailed illustration and description are omitted. In the case of this embodiment, the spline shaft 1
4a, an inner locking groove 41 is formed in a portion of the outer peripheral surface near the front end.
It is formed over. And this inner locking groove 41,
Formed over the entire circumference on the inner peripheral surface of the hub 3a near the outer end.
The outer locking groove 42 has a circular cross section,
A certain retaining ring 43 is stretched. This retaining ring 43
Elastic metal such as spring steel and stainless steel
By making it annular, the diameter can be elastically expanded and contracted.
are doing. Such a retaining ring 43 is, as described above,
Inserting the line shaft 14a into the spline hole 12
Prior to this, it is mounted in the inner locking groove 41. the above
Insert the spline shaft 14a into the spline hole 12
At this time, the retaining ring 43 is supported by the inner peripheral surface of the hub 3a.
While the diameter of the spline hole 12 is reduced elastically.
Pass through. Then, the retaining ring 43 is engaged with the outer side.
The diameter is elastically restored (expanded) in alignment with the groove 42.
Large) and the retaining ring 43 is connected to the outer locking groove 42 and the inner side.
It is bridged between the locking grooves 41. In this case,
These retaining rings 43, inner and outer locking grooves 41 and 42,
Constitute the retaining means described in the claims. Soshi
The retaining ring 43 is connected to the outer locking groove 42 and the inner locking groove.
41 and the spline shaft 14a
Displacement in the direction to escape from the spline hole 12
It is preventing. Further, in the case of this example, the inspection and repair are performed.
In addition, the hub 3a and the drive shaft member 13a can be easily disassembled.
To join these two members 3a and 13a together.
In order to easily reduce the diameter of the retaining ring 43, the hub 3a
Some shapes are devised. That is, in the case of this example,
A plurality of circumferential surfaces on the inner peripheral surface of the outer end of the spline hole 12
At three places (3 places in the example shown)
The outer ends of the grooves 44 in the axial direction of the respective grooves 44
Formed so as to open around the outer end opening of the in-hole 12.
I have. When reducing the diameter of the retaining ring 43 for disassembly
In each of the concave grooves 44, a diameter reducing jig as shown in FIGS.
The protruding pieces 46 of the tool 45 are inserted. Each of these projections 4
6, 46, on the inner peripheral side of the tip, toward the tip edge
Guide inclined surface 4 inclined in the direction toward the radially outward direction
7 are formed. Each of the protruding pieces 46, 46 and the cylinder
The outer peripheral surface of the spline shaft 14a is
Prevent interference with each tooth of the male spline part 20 existing on the peripheral surface
Concave grooves 49, 49 for stopping are formed in the axial direction.
When performing the disassembling operation, the protruding pieces 46, 46
Each guide groove 4 is inserted into each of the concave grooves 49, 49, and
At 7, 47, a plurality of outer peripheral edges of the retaining ring 43
To reduce the diameter of the retaining ring 43.
The retaining ring 43 is moved radially inward from the outer locking groove 42.
Pull it out. Then, the diameter of the retaining ring 43 is reduced in this manner.
The spline shaft 14a is
By pulling out from the inside of the in-hole 12, the hub 3a and the drive shaft member
13a. The protrusions 46, 46 are arranged in the circumferential direction.
Width W₄₆Of the discontinuous portion 50 of the retaining ring 43
In the circumferential direction (when mounted in the outer locking groove 42)
Width W ₅₀(W₄₆> W₅₀). For this reason
Is the width W as shown in FIG. ₄₆Is the above width W₅₀Less than
I (W₄₆<W₅₀), And any of the protrusions 46 is the discontinuous portion.
50, it is stretched at the discontinuous portion 50,
As described above, the respective projecting pieces 46, 46 are inserted into the respective concave grooves 44, 44.
Even if it is pushed in, the diameter of the retaining ring 43 cannot be reduced.
This is because there is a possibility. In the case of this embodiment, the outer end of the outer race 1
Between the inner peripheral surface and the outer peripheral surface of the intermediate portion of the hub 3a, and
Outer perimeter of housing part 15 constituting drive shaft member 13a
Between the surface and the inner end of the inner peripheral surface of the knuckle 5
Provided with a plurality of rolling elements 1
The openings at both ends of the internal space where 1 and 11 are installed
You. With this configuration, lubrication sealed in this internal space
Grease from leaking to the outside,
Foreign matter such as rainwater and garbage enters this internal space.
Has been prevented. The wheel driving shaft of the present invention configured as described above.
According to the receiving unit, the inner ring 25 is connected to the hub 3a.
The fixing is performed by a caulking portion 9 provided at the inner end of the hub 3a.
Even if the process is performed, sufficient durability can be ensured. This reason
The reason will be described with reference to FIG. As shown in the figure,
In the wheel drive bearing unit of the invention, the outside of the constant velocity joint
The housing part 15 which becomes a wheel, and the constant velocity
The center axes of the inner ring (not shown) and the
The inner ring for constant velocity joints
When a torque equal to or larger than a predetermined value is applied to the
The bending moment M is applied to the inner end of the drive shaft member 13a.₀ Made
Assume that you have used In the state of the present invention in this state,
The shaft member 13a is formed in a cylindrical portion with respect to the hub 3a (FIGS. 1 and 2).
Cylindrical portion 10 provided on the outer peripheral surface of the base 28 and the inner end of the hub 3a.
(Figs. 1 and 2) Fitting part between inner peripheral surface and male spline
Splice between the part 20 and the female spline part 19 (FIGS. 1 and 2)
At a point B which is the outer end position of the engagement portion. And
At point A ′, which is the inner end position of the fitting portion, and at point B,
Each size is F_A 'And F_B Forces are opposite to each other
Acts in opposite directions. In the case of this example, the drive shaft member 13
a, the degree of concentration of stress is large and the strength is the least.
The part that is easy to add is the male spline part 20 and the taper
A portion 53 between the surface portion 29 is formed. In the case of the present invention, the above circle
The columnar portion 28 is positioned more axially than the male spline portion 20.
It is provided in the part deviated to the side. Therefore, the above-mentioned interval portion
Axial distance between point C 'located above and point A'
Is the bending moment M acting on the point C ′.
_C The size of 'is M_C '= M₀ -F_A 'X. Previous
In the case of the conventional structure described above, the drive shaft member 13 (FIG. 9)
Among them, the concentration of stress is large and the strength is the least
At the point C (FIG. 10),
Maximum value of bending moment M to be used₀ Was working,
In the present invention, it acts on the point C ′, which corresponds to this point C.
Bending moment M_C′ Is the maximum value M₀ Smaller than
Can be suppressed. Therefore, according to the present invention, the wheel drive
The durability of the entire bearing unit can be sufficiently ensured. In addition, in the case of the present invention, such a durable
The bearing unit for wheel drive has been
There is no increase in size or weight. In addition, actual use
In the use state, the drive shaft member 13a is at two points with respect to the hub 3a.
Contact only with the drive shaft from the hub 3a.
The load applied to the material 13a is distributed over a certain wide area.
And a distributed load. However, such actual use condition
Is the distance from the hub 3a to the drive shaft member 13a.
The resultant force of the fabric load is concentrated only at point A 'and point B.
Can be thought of as replacing
Therefore, in this actual use condition, the same
Results are obtained. Therefore, in actual use conditions
However, according to the present invention, sufficient durability can be ensured. Further, in the case of the present invention, the cylindrical portion 1
0 on the outer peripheral surface of the cylindrical portion 28.
Externally fitted with a tight fit with a fixed interference. Follow
Therefore, in the case of the present invention, the aforementioned Japanese Patent Application No. 2000-153
Unlike the conventional structure disclosed in No. 83, the constant velocity
A predetermined size from the joint inner ring to the housing portion 15
Even if torque greater than the magnitude is applied,
8 is part of the inner peripheral surface of the base half of the cylindrical portion 10.
There is no strong collision with the club. Therefore, based on this collision
May cause unpleasant noise or vibration, or fretting may occur.
It can be prevented from being born. In the case of this example, the column
Grease holding grooves 30, 3,
0, the respective grease holding grooves 30, 3
Introduce or apply a relatively large amount of grease within 0
Can be. Introduced into each of these grease holding grooves 30, 30
Or, the applied grease is applied to the outer peripheral surface of the cylindrical portion 28.
And lubricating the fitting portion between the inner peripheral surface of the base half of the cylindrical portion 10
Play a role. Therefore, at the time of use, the cylindrical portion 28
Is twisted with respect to the inner circumferential surface of the base half of the cylindrical portion 10
As described above, a part of the cylindrical portion 28 is deformed,
Even if they tend to rub each other,
Can prevent unpleasant noise and fretting from occurring
You. In the case of the present invention, the above spline shaft
Male spline portion 20 formed on the outer peripheral surface of the first half of 14a
Each of the constituent teeth is opposed to the center axis of the spline shaft 14a.
The circumference of the spline shaft 14a is
A predetermined twist angle so that it is inclined in the same direction
I have. The above-mentioned spline hole 12 has
With the spline shaft 14a inserted, the female spline
19 and male spline portion 20
And both spline portions 19, 20 near both ends in the axial direction.
Fit parts with a specified interference in the circumferential direction
Have been combined. Therefore, according to the present invention, these two sp
In the circumferential direction of each tooth constituting the line portions 19 and 20,
Generation of rattling noise due to collision between opposing sides,
Spline engagement consisting of these two spline portions 19, 20
It is possible to suppress the rattling of the club. These conclusions
As a result, according to the present invention,
Also provide more durability and
Generation of noise and vibration can be suppressed. In the case of this embodiment, the base of the cylindrical portion 10 is used.
Interference between the inner peripheral surface of the half part and the outer peripheral surface of the cylindrical portion 28
Is set in the above-mentioned predetermined range (about 5 to 30 μm).
The axial direction of the female spline section 19 and the male spline section 20
Set the tightening margin in the circumferential direction between
The predetermined range described above (about 5 to 70 μm). This
Therefore, the spline shaft 19 is inserted into the spline hole 12
Insert the stud into the male thread or nut
While preventing excessive force from being applied to the female thread
In addition, ensure the durability of these studs and nut members
I can do it. In the example shown, the drive shaft member 13a
The outer peripheral surface of the columnar portion 28 provided in the space and the hub 3a
Base half of the cylindrical portion 10 corresponding to the cylindrical portion provided at the inner end
The inner peripheral surface of the part should not change in diameter in the axial direction.
It has an almost perfect cylindrical surface. However, these cylindrical
The outer peripheral surface of the portion 29 and the inner peripheral surface of the base half of the cylindrical portion 10
It is not limited to such a cylindrical surface. For example, both
If the peripheral surfaces are fitted to each other with a specified interference
If these two circumferential surfaces move inward in the axial direction,
A tapered surface that is slightly inclined in the direction in which the diameter increases
You can also. Therefore, in the present invention, the circle described in the claim is used.
The columnar part and the cylindrical part have their respective outer or inner peripheral surfaces.
Is a generic term that includes such a tapered surface
is there. Further, in the case of the wheel drive bearing unit of this embodiment,
In this case, the spline shaft 14a
Keep the stopper out of the part near the tip of the spline shaft 14a.
The inner locking groove 41 formed on the peripheral surface and the spline hole 12
A retaining ring 43 is hung on the outer locking groove 42 provided at the outer end of the
I try to pass it. For this reason, for example,
A screw portion is provided at the tip of the shaft 14a, and screwed into this screw portion.
・ The outer end surface of the hub 3a is held down with a tight holding nut.
To prevent the spline shaft 14a from coming off.
Easier assembly work and lighter weight than structure
You. In this example, grease was introduced.
Grease holding grooves 30 for application
On the outer peripheral surface of the cylindrical portion 28 provided on the in shaft 14a,
The shape of the cylindrical portion 28 is inclined with respect to the central axis of the cylindrical portion 28.
Has formed. However, these grease holding grooves 30, 30
Is not limited to such a shape. For example,
The lease holding grooves 30, 30 have a first example of another shape shown in FIG.
As shown in the figure, at a plurality of positions in the circumferential direction of the outer peripheral surface of the columnar portion 28,
Each was formed parallel to the center axis of the spline shaft 14a.
Or, as in a second example of another shape shown in FIG.
The cylindrical shape is provided at a plurality of positions in the axial direction of
It may be formed over the entire circumference of the portion 28. Also, the above
Instead of forming the grease holding groove 30 like above,
Circular grease holding recesses are provided at a plurality of positions on the outer peripheral surface of the columnar portion 28.
Parts 56, 56 are provided, and these grease holding recesses 5 are provided.
The grease applied to 6, 56 provided on the hub 3a.
The inner peripheral surface of the base half of the cylindrical portion 10 and the outer peripheral surface of the cylindrical portion 28
Can be lubricated. Next, FIG. 9 shows a second embodiment of the present invention.
An example is shown. In the case of this example, the case of the first example described above is used.
Unlike the case, the female screw 4
0 (FIGS. 1 and 2) is not formed. Instead, this example
In the case of, the center of the tip end surface of the spline shaft 14a
A column portion 54 is formed to protrude in the axial direction. And
A male screw part 55 is formed on the outer peripheral surface of the pillar part 54.
In the case of this example, a stash (not shown) is
Screw and tighten the screw holes formed in the end face of the
Also shown on the external thread formed on the outer peripheral surface of the stud
Screw the nut member not to be
With the nut abutting against the outer end face of the hub 3a.
By rotating the material and pulling the stud,
Pull the spline shaft 14a inside the spline hole 12.
Embed. Also in this regard, the aforementioned 2001-14987.
No. 2 and not related to the gist of the present invention
Therefore, detailed illustration and description are omitted. Other composition and
Operation is the same as in the first example described above,
The description of the operation is omitted. Next, FIG. 10 shows a second embodiment of the present invention.
Three examples are shown. In the case of this example,
Unlike the case, a pair of inner rings 7 is provided on the outer peripheral surface of the intermediate portion of the hub 3b.
a and 7b are externally fitted. And the inner end of this hub 3b
And a mounting flange of the hub 3b
4 and a pair of inner rings 7a, 7b
Is sandwiched. With this configuration, these inner rings 7a,
7b is fixedly connected to the hub 3b. Also this
Out of the pair of inner rings 7a and 7b (left side in FIG. 10)
The first inner raceway 6 is formed on the outer peripheral surface of the inner race 7a of
Between the first inner raceway 6 and the outer raceway 2, a plurality of
The rolling elements 11 are held so as to freely roll. Also, this example
Is different from the above examples,
Outer peripheral surface of columnar portion 28 provided near the base end of shaft 14a
Grease for introducing and applying grease
The groove 30 and the grease holding recess 56 (see FIGS. 1 and 2) are formed.
Not done. For other configurations and functions, refer to
Are the same as those of the first example shown in FIGS.
The description of the operation will be omitted. In each of the above examples, the spline shaft 14
a from the spline hole 12
Outer locking groove 42 provided near the outer end of the inner peripheral surface
On the outer peripheral surface near the tip of the spline shaft 14a.
By hooking a retaining ring 43 over the girder inner locking groove 41
I am trying. However, the present invention is limited to such a structure.
Instead, the outer locking groove 42 is omitted, and the hub 3
a at the outer end surface of the spline shaft 14a.
Between the inner locking groove 41 and the ring
To prevent the spline shaft 14a from coming off.
And various other retaining means. [0041] The bearing unit for driving a wheel according to the present invention is
As described above, the inner ring is connected to the hub to operate.
Fixing is performed by swaging provided at the inner end of the hub.
Even in the event of an accident, ensure sufficient durability and
The generation of unusual noise and vibration can be suppressed.

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 a partially enlarged sectional view of FIG. FIG. 3 is a perspective view of a diameter reducing jig. FIG. 4 is a view for explaining the reason for restricting the width direction of the protrusion;
The arrow A figure of FIG. FIG. 5 is a schematic diagram for explaining a distribution state of a bending moment acting on a drive shaft member in the present invention. FIG. 6 is an enlarged cross-sectional view corresponding to a portion B in FIG. 1 showing a first example of another shape of the grease holding groove provided on the outer peripheral surface of the spline shaft. FIG. 7 is a view similar to FIG. 6, showing a second example of another shape. FIG. 8 is a view similar to FIG. 6, showing a grease holding recess provided on the outer peripheral surface of the spline shaft. FIG. 9 is a sectional view showing a second example of the embodiment of the present invention. FIG. 10 is a sectional view showing a third example. FIG. 11 is a half sectional view showing an example of a conventional structure. FIG. 12 is a schematic diagram for explaining a distribution state of a bending moment acting on a drive shaft member in a conventional structure. DESCRIPTION OF SYMBOLS 1 Outer ring 2 Outer ring track 3, 3a, 3b Hub 4 Mounting flange 5 Knuckle 6 First inner ring track 7a First inner ring 7b Second inner ring 8 Second inner ring track 9 Caulking section 10 Cylindrical section 11 Rolling element 12 Spline hole 13, 13a Drive shaft member 14, 14a Spline shaft 15 Housing section 16 Outer track 17 Coupling member 18 Encoder 19 Female spline section 20 Male spline section 21 Column section 22 Curved surface section 23 Space 24 Step section 25 Inner ring 26 Coupling flange 27 Small diameter step section 28 Cylindrical part 29 Tapered surface part 30 Grease holding groove 31 Encoder 32 Metal core 33 Ring part 34 Permanent magnet 35 Insertion hole 36 Sensor unit 37 Flange part 38 Connector 39 Annular space 40 Screw hole 41 Inner locking groove 42 Outer locking groove 43 retaining ring 44 concave groove 45 diameter reducing jig 46 projecting piece 47 guide inclined surface 48 cylindrical base 49 Concave groove 50 Discontinuous portion 52 Seal ring 53 Intersection 54 Column 55 Male thread 56 Grease holding recess

Claims (1)

Claims 1. An outer ring which has a double row of outer ring raceways on an inner peripheral surface and does not rotate during use, and a mounting flange for supporting a wheel at a portion near an outer end of an outer peripheral surface, Similarly, a first inner raceway is provided directly or through a separate inner raceway in the intermediate portion, and a spline hole is provided in the center portion, and a second inner raceway is formed on the outer peripheral surface near the inner end of the outer peripheral surface. A hub having outer rings fitted therein, a plurality of rolling elements rotatably provided between the outer races and the first and second inner races, and a spline shaft engaged with the spline holes. A drive shaft member having a housing portion serving as an outer race of a constant velocity joint, and a drive shaft member provided between the drive shaft member and the hub, wherein the spline shaft is provided with the spline hole. With a retaining means to prevent from getting out of At the inner end portion of the hub, a portion protruding from the inner end surface of the inner ring externally fitted to the inner end portion of the outer peripheral surface of the hub is plastically deformed diametrically outward. In a wheel drive bearing unit in which the inner ring is fixedly connected to the hub, a part of the drive shaft member is more axially inner than a male spline portion provided on an outer peripheral surface of the spline shaft. A cylindrical portion provided in a portion deviated to the other side, and provided on the inner peripheral surface of the inner end portion of the hub so as to face the outer peripheral surface of the cylindrical portion, and have a tightening margin for the cylindrical portion. And a toothed part forming one of the male spline portion and the female spline portion formed on the inner peripheral surface of the spline hole. And inclined with respect to the center axis of the spline hole. The other spline portion is formed in parallel with the spline hole and the central axis of the spline shaft, respectively, and the male and female spline portions are partially fastened in the circumferential direction. A wheel drive bearing unit characterized by being fitted with a margin.