JP2005083496A - Conical roller bearing device for wheel and its assembling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conical roller bearing device 1 having easy-to-assemble construction. <P>SOLUTION: A seal device 8 has an annular shell portion (a metal ring) 8b mounted between a raceway portion 3e on the outer peripheral face of an inner shaft 3 and a flange portion 3b and seal lip portions 8b, 8c having slide contact with the inner peripheral face on one axial end side of an outer ring 2. When assembling the conical roller bearing device 1, before mounting the outer ring 2 on the inner shaft 3, the first seal device 8 can be mounted on the inner shaft 3 in a normal condition instead of being temporarily assembled thereon. When mounting the outer ring 2 on the inner shaft 3, the seal lip portions 8b, 8c have contact with the inner peripheral face on one axial end side of the outer ring 2 in a proper condition. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tapered roller bearing device that rotatably supports a wheel on a vehicle body such as an automobile, and an assembling method thereof.

  A conventional example (for example, refer to Patent Document 1) related to the tapered roller bearing device for the wheel will be described with reference to FIG. In the figure, 80 is an outer ring, 81 is a hub body (inner shaft), 82 is an inner ring, 83a is a first row of tapered rollers, 83b is a second row of tapered rollers, 84 is a first cage, and 85 is a second holding. , 86 is a first sealing device, and 87 is a second sealing device. Although not shown, the outer ring 80 is fixed to a knuckle or a carrier that is a part of a vehicle body or the like, and a wheel is attached to the hub body 81 although not shown. A large diameter portion 91 is provided on the large diameter side of the track portion 90 provided in the hub body 81, and a small flange 92 is provided on the small diameter side of the track portion 90. The first seal device 86 has a configuration in which a seal lip portion 86b is attached to the inner periphery of the metal ring 86a, and the cylindrical portion of the metal ring 86a is externally attached to the outer peripheral surface of one end side in the axial direction of the outer ring 80 (vehicle outer side). The seal lip portion 86 b is brought into contact with the curved surface portion between the flange portion 93 and the track portion 90 of the hub body 81.

  In assembling such a tapered roller bearing device, first, as shown in FIG. 9, before assembling the outer ring 80 into the hub body 81, the curved surface portion between the flange portion 93 and the raceway portion 90 of the hub body 81 is used. The first seal device 86 is loosely fitted. Next, the first row of tapered rollers 83a are inserted into the respective pocket portions of the first cage 84 from the inner diameter side to make an assembly of the first cage 84 and the first row of tapered rollers 83a. This assembly is arranged on the track portion 90 of the hub body 81. The hub main body 81 has a small collar 92, but since there is a slight gap between the tapered roller 83a and the pocket portion of the first retainer 84, the tapered roller 83a is stored in the pocket portion. Over the gavel 92, it is arranged on the track surface 90. The outer ring 80 is mounted on the outer diameter side of the hub main body 81 as described above. At the final stage, the metal ring of the first seal device 86 is disposed on the outer peripheral surface of the outer ring 80 at one end side in the axial direction (vehicle outer side). The cylindrical portion 86a is press-fitted and fitted.

The reason for this assembly procedure will be described. That is, since the small collar 92 is provided in the hub main body 81, the first row of tapered rollers 83 a and the first retainer 84 are placed on the raceway portion 90 of the hub main body 81 before the outer ring 80 is attached to the hub main body 81. Must be assembled. Therefore, if the first seal device 86 is attached to the outer ring 80 before the outer ring 80 is fitted on the hub body 81, the outer ring 80 to which the first seal device 86 is attached is attached to the hub body 81. 1, the first seal device 86 interferes with the first row of tapered rollers 83 a assembled to the hub body 81, and the outer ring 80 cannot be mounted on the hub body 81.
JP 2000-94902 A

  In the above conventional example, in the process of mounting the outer ring 80 on the hub body 81, the cylindrical portion of the metal ring 86 a of the first seal device 86 fitted loosely toward the hub body 81 is connected to the outer periphery of one end in the axial direction of the outer ring 80. The work of press-fitting to the surface is difficult and time-consuming.

  The present invention includes an outer ring having first and second track portions, an inner shaft having a wheel mounting flange portion on one axial end side and a track portion facing the first track portion, and the inner shaft An inner ring having a track portion that is externally fitted on the outer circumference on the other end side in the axial direction and that faces the second track portion, and a first ring disposed between the first track portion of the outer ring and the track portion of the inner shaft. One row of tapered rollers, a second row of tapered rollers disposed between the second raceway portion of the outer ring and the raceway portion of the inner ring, and holding for equally holding the tapered rollers of each row in the circumferential direction In the tapered roller bearing device for a wheel provided with a vessel, an annular body part that is attached between the flange part of the outer peripheral surface of the inner shaft and the raceway part, and extends radially outward from the body part, A seal device having a seal lip portion slidably in contact with an inner peripheral surface on one end side in the axial direction of the outer ring It is characterized by comprising.

  In addition, it is preferable that a plurality of seal lip portions of the seal device are provided. When there are a plurality of seal lip portions, all the seal lip portions may be brought into contact with the outer ring, or any of the seal lip portions may not be brought into contact with the outer ring.

  As described above, according to the present invention, when the tapered roller bearing device is assembled, before the outer ring and the inner shaft are combined, the sealing device, the cage, and the first row of tapered rollers can be assembled to the inner shaft. . Thereby, when assembling the tapered roller bearing device, handling of each member of the tapered roller bearing device is facilitated, and the operation can be easily performed.

  As a preferred embodiment of the present invention, the seal lip portion of the seal device may be configured to incline from the body portion toward the axial flange portion and extend radially outward. In this case, in the process of attaching the outer ring to the inner shaft with the sealing device attached to the inner shaft, the seal lip portion of the sealing device attached to the inner shaft side is the inner peripheral surface of the outer ring on one axial end side Since it becomes easy to incline toward the one end side in the axial direction by coming into contact with this, the seal lip portion comes into contact with the inner peripheral surface on the one end side in the axial direction of the outer ring in an appropriate state without reversing in the reverse direction.

  As a method for assembling the tapered roller bearing device having the above-described configuration, the step of attaching the seal device to the outer peripheral surface of the inner shaft, the tapered roller and the cage in the first row, and a raceway portion of the inner shaft. And the assembly of the inner shaft, the sealing device, the first row of tapered rollers and the cage is inserted into the outer ring, and the seal lip portion of the sealing device is arranged on the inner end of the outer ring in the axial direction. And a step of bringing the surface into sliding contact with the peripheral surface.

  According to this assembly method, as described above, when the tapered roller bearing device is assembled, each member of the tapered roller bearing device can be easily handled and the operation can be easily performed. Productivity is improved.

  In the present invention, when the tapered roller bearing device is assembled, each member constituting the tapered roller bearing device can be easily handled, and the tapered roller bearing device can be improved in productivity.

  1 to 4 show an embodiment of the present invention. 1 is a cross-sectional view showing a tapered roller bearing device for a wheel, FIG. 2 is a diagram showing a stage in which the first seal device is incorporated in the inner shaft of FIG. 1, and FIG. 3 is a diagram showing the assembly shown in FIG. FIG. 4 is a view showing a stage in which one cage and a first row of tapered rollers are assembled, and FIG. 4 shows the second cage, the second row of tapered rollers and the inner ring after the outer ring is mounted on the assembly shown in FIG. FIG.

  In the figure, reference numeral 1 denotes a double row tapered roller bearing device. In FIG. 1, the left side of the tapered roller bearing device 1 is the vehicle outer side, and the right side is the vehicle inner side.

  The tapered roller bearing device 1 is, for example, for supporting a driven wheel, and includes an outer ring 2, an inner shaft 3, an inner ring 4, a first row of tapered rollers 5a, a second row of tapered rollers 5b, A first cage 6 on the vehicle outer side, a second cage 7 on the vehicle inner side, a first seal device 8 on the vehicle outer side, and a second seal device 9 on the vehicle inner side are provided.

  On the inner peripheral surface of the outer ring 2, two conical track portions 2a and 2b are provided adjacent to each other in the axial direction. The outer diameter of the outer ring 2 is provided with a flange portion 2c extending outward in the radial direction. The first track portion 2a on the vehicle outer side has an inclination that gradually increases in diameter toward the vehicle outer side, and the second track portion 2b on the vehicle inner side gradually increases in diameter toward the vehicle inner side. It is tilted. The flange portion 2c is fixed to a carrier or knuckle that is a part of the vehicle body in a non-rotating manner by a bolt (not shown).

  The inner shaft 3 includes a shaft portion 3a, a flange portion 3b provided on one end side (vehicle outer side) in the axial direction of the shaft portion 3a so as to extend radially outward, and more axially on the vehicle outer side than the flange portion 3b. And a cylindrical inlay portion 3c provided to project. The outer diameter of the shaft portion 3a is a conical track portion facing the large diameter portion 3e and the first track portion 2a of the outer ring 2 from the flange portion 3b side toward the other axial end side (vehicle inner side). 3f and a small diameter portion 3g having a smaller diameter than the raceway portion 3f are provided. The large diameter portion 3e and the large diameter side of the raceway portion 3f are stepped, and the wall surface (large collar surface) 3h rising from the large diameter side of the raceway portion 3f to the large diameter portion 3e is a tapered roller 5a in the first row. It is a guide surface that guides the large end surface of the. On the small-diameter side of the track portion 3f, a small rod 3i bulging outward in the radial direction is provided. Although not shown, wheels and brake disks are attached to the flange portion 3b and the spigot portion 3c.

  A conical track portion 4 a facing the second track portion 2 b of the outer ring 2 is provided on the inner peripheral surface of the inner ring 4, and the inner ring 4 is externally fitted to the small diameter portion 3 g of the inner shaft 3. . A large ridge 4b is provided on the large diameter side of the raceway portion 4a of the inner ring 4, and a small ridge 4c is provided on the small diameter side of the raceway portion 4a. The end of the small-diameter portion 3g of the inner shaft 3 is cylindrical before assembly, and after the inner ring 4 is fitted on the small-diameter portion 3g, the cylindrical end is expanded outward in the radial direction. The inner ring 4 is integrally coupled to the inner shaft 3 and the axial force is applied to the inner ring 4 by forging and crimping.

  The first row of tapered rollers 5 a is disposed between the first track portion 2 a of the outer ring 2 on the vehicle outer side and the track portion 3 f of the inner shaft 3, and the second row of tapered rollers 5 b is arranged on the vehicle inner side of the outer ring 2. The second track portion 2b on the side and the track portion 4a of the inner ring 4 are disposed.

  The first and second cages 6 and 7 are injection-molded with resin or formed by press-molding a metal plate and have the same shape. The first cage 6 has a structure in which the tapered rollers 5a in the first row are arranged at substantially equal intervals in the circumferential direction so as not to come out to the outer diameter side. The second cage 7 has a structure in which the tapered rollers 5b in the second row are arranged at substantially equal intervals in the circumferential direction and are not pulled out to the outer diameter side. The first and second cages 6 and 7 have a conical shape, and pockets 6a and 7a made of substantially trapezoidal holes penetrating in the radial direction are provided at a plurality of locations in the circumferential direction. . The outer size of the first and second cages 6 and 7 is a virtual one that connects the center lines of the tapered rollers 5a and 5b in each row arranged on the raceway portion 3f of the inner shaft 3 and the raceway portion 4a of the inner ring 4. It is set to be larger than the conical surface X. Regarding the pockets 6a and 7a, the axial length is set larger than the axial length of the tapered rollers 5a and 5b, and the circumferential width is set smaller than the outer diameter of the tapered rollers 5a and 5b. In this way, by defining the outer size of the first and second cages 6 and 7 and the size of the pockets 6a and 7a of the first and second cages 6 and 7, the tapered rollers 5a and 5b are formed into the pockets 6a. , 7a so as not to come out to the outer diameter side.

  The first sealing device 8 and the second sealing device 9 seal the annular space 10 in which the tapered rollers 5a and 5b are disposed. Although not shown, the annular space 10 is filled with a lubricant such as grease.

  The first seal device 8 is disposed between the end portion of the outer ring 2 on the vehicle outer side and the flange portion 3 b of the inner shaft 3 so as to close the opening on the vehicle outer side of the outer ring 2. The first seal device 8 has a configuration in which two seal lip portions 8b and 8c are attached to the outer periphery of a metal ring 8a as a body portion. The metal ring 8a is integrally formed with a cylindrical portion 8a1 fitted into the outer periphery of the large-diameter portion 3e of the inner shaft 3 by press fitting, and a vehicle inner side end portion of the cylindrical portion 8a1 so as to extend radially outward. Part 8a2. Each of the two seal lip portions 8b and 8c is made of rubber or resin or the like that is bonded to the outer periphery of the flange portion 8a2 of the metal ring 8a by vulcanization molding, and the inner shaft from the tapered roller 5a side of the first row respectively. 3 is a shape inclined toward the flange portion 3b side. The two seal lip portions 8b and 8c are in contact with the inner peripheral surface of the outer ring 2 on the vehicle outer side.

  The second seal device 9 is disposed between the end of the outer ring 2 on the vehicle inner side and the large collar 4b of the inner ring 4 so as to close the opening on the vehicle inner side of the outer ring 2. The second seal device 9 is a pack seal in which a seal ring 9a with a seal lip and a slinger 9b made of only a metal ring are combined.

  Here, the assembly method of the above-mentioned tapered roller bearing device 1 will be described with reference to FIGS. 2 to 4 are shown with the center line of the inner shaft 3 horizontal for easy understanding in relation to FIG. 1, the actual assembly work is performed in the center line of the inner shaft 3. And the flange portion 3b of the inner shaft 3 is set downward.

  First, as shown in FIG. 2, the first seal device 8 is attached to the inner shaft 3. That is, the cylindrical portion 8a1 of the metal ring 8a of the first seal device 8 is fitted into the region near the flange portion 3b on the outer peripheral surface of the shaft portion 3a of the inner shaft 3 by press fitting. At this time, the end portion on the vehicle inner side in the shaft portion 3a of the inner shaft 3 is cylindrical because it is not subjected to forging caulking.

  Thereafter, as shown in FIG. 3, an assembly in which the first row of tapered rollers 5 a is assembled in each pocket 6 a of the first retainer 6 is assembled on the raceway portion 3 f of the inner shaft 3. At this time, the tapered roller 5a is moved over the small collar 3i of the inner shaft 3 by moving the tapered roller 5a radially outward by a predetermined gap existing between the tapered roller 5a and the pocket 6a of the first retainer 6. Thus, it arrange | positions on the track | orbit part 3f.

  Next, as shown by an arrow A in FIG. 3, the outer race 2 is mounted from the vehicle inner side of the shaft portion 3a of the inner shaft 3, whereby the first raceway portion 2a of the outer race 2 is connected to the first row of tapered rollers 5a. And the two seal lip portions 8b, 8c of the first seal device 8 are brought into contact with the inner peripheral surface of the end portion of the outer ring 2 on the vehicle outer side. Thus, in the process of externally fitting the outer ring 2 to the inner shaft 3, the two seal lip portions 8 b and 8 c of the first seal device 8 attached to the inner shaft 3 side are arranged at the vehicle outer side end of the outer ring 2. Since it is easy to incline toward the vehicle outer side by contacting the inner peripheral surface, the two seal lip portions 8b, 8c are not reversed in the reverse direction, and are in an appropriate state on the inner peripheral surface of the vehicle outer side end portion of the outer ring 2. Will come in contact.

  Further, after assembling the assembly in which the second row of tapered rollers 5b are assembled in each pocket 7a of the second cage 7 on the raceway portion 4a of the inner ring 4, as shown in FIG. It is inserted between the second raceway part 2 b of the outer ring 2 and the small diameter part 3 g of the inner shaft 3.

  Thereafter, forging is performed so that the end portion of the small-diameter portion 3g of the inner shaft 3 is expanded radially outward. As a result, the inner ring 4 is integrally coupled to the inner shaft 3 and an axial force is applied to the inner ring 4.

  Finally, the tapered roller bearing device 1 shown in FIG. 1 is completed by mounting the second seal device 9 between the vehicle inner side end of the outer ring 2 and the large collar 4b of the inner ring 4.

  In the above assembling method, the step of assembling the assembly of the first cage 6 and the first row of tapered rollers 5a into the inner shaft 3 is, for example, between the first cage 6 and the first row of tapered rollers 5a. With the assembly placed below, the inner shaft 3 may be inserted from above, and thereafter, the assembly may be turned upside down.

  As described above, when assembling the tapered roller bearing device 1, the first seal device 8 is attached to the inner shaft 3 in a normal state, not temporarily assembled, and the outer ring 2 is attached to the inner shaft 3. Since the work can be performed, in the process of assembling the tapered roller bearing device 1, the handling of each member of the tapered roller bearing device 1 is facilitated, and the work can be easily performed, so that productivity is improved.

  Hereinafter, other examples of the present invention will be described.

  In the said embodiment, the 1st sealing apparatus 8 can be made into a type as shown, for example in FIG.5 and FIG.6. In the first seal device 8 shown in FIG. 5, in addition to the configuration shown in the above embodiment, a side seal lip portion 8 d is provided outside the outer seal lip portion 8 b, and this side seal lip portion 8 d is connected to the flange of the inner shaft 3. It is made to contact from the axial direction the base side in the inner surface of the part 3b. In the first seal device 8 shown in FIG. 6, in addition to the configuration shown in the above embodiment, auxiliary seal lip portions 8e and 8f are provided on the outer seal lip portion 8b and the inner seal lip portion 8c, respectively. The diameter of the inner peripheral surface of the vehicle outer side end is increased stepwise toward the outside in the axial direction. The outer seal lip portion 8b is on the outer diameter-enlarged cylindrical surface 2d of the outer ring 2, the inner seal lip portion 8c is on the inner cylindrical surface 2e, and the auxiliary seal lip portion 8e of the outer seal lip portion 8b is on the outer wall surface 2f. The auxiliary seal lip portion 8f of the inner seal lip portion 8c is in contact with the inner wall surface 2g. If it is the 1st sealing device 8 shown in FIG.5 and FIG.6, the merit regarding the assembly similar to the said embodiment can be acquired, and also sealing performance can be improved further compared with the thing of the said embodiment.

  In the said embodiment, the kind of 2nd sealing apparatus 9 is not specifically limited, Generally well-known various seal | stickers can be used.

  In the above embodiment, although not shown, a screw shaft portion is formed at the end of the inner shaft 3 on the vehicle inner side, and a nut is screwed onto the screw shaft portion, thereby fixing the inner ring 4 to the inner shaft 3. It can be set as a form to do.

  In the tapered roller bearing device 1 shown in the above embodiment, the shape of components other than the first seal device 8 is not particularly limited.

  The present invention can also be applied to a tapered roller bearing device of the type used to support drive wheels. Although not shown, this type of tapered roller bearing device has a structure in which a spline hole is provided in the center of the inner shaft 3 and a drive shaft is spline fitted to the spline hole.

  As shown in FIG. 7, the cylindrical surface 3j having the same diameter as the small diameter side portion of the track portion 3f is provided on the small diameter side of the track portion 3f of the inner shaft 3 without providing the small flange 3i shown in the above embodiment. Can do. The cylindrical surface 3j may have a smaller diameter than the end portion on the small diameter side of the track portion 3f. In this case, there is an advantage in terms of manufacturing, such as easy processing when forming the raceway portion 3f of the inner shaft 3. Further, the inner ring 4 is also provided with a cylindrical surface 4d having the same diameter as that of the end portion on the small diameter side of the track portion 4a without providing the small flange 4c shown in the above embodiment on the small diameter side of the track portion 4a. In this case, in the stage of FIG. 4, an assembly in which the second cage 7 is combined with the second row of tapered rollers 5 b is inserted into the inner diameter side of the second raceway portion 2 b of the outer ring 2, and then this second The inner ring 4 can be incorporated between the inner diameter side of the tapered rollers 5 b in the row and the small diameter portion 3 g of the inner shaft 3.

Sectional drawing which shows the tapered roller bearing apparatus which concerns on one Embodiment of this invention. The figure which shows the step which integrated the 1st sealing apparatus in the inner shaft of FIG. The figure which shows the step which incorporated the 1st retainer and the 1st row of tapered rollers in the assembly shown in FIG. The figure which shows a mode that the assembly | attachment of the 2nd cage | basket, the tapered roller of 2nd row | line | column, and an inner ring | wheel is assembled after attaching an outer ring | wheel to the assembly shown in FIG. The figure which shows the principal part of a tapered roller bearing apparatus in the other example of the 1st sealing apparatus shown in FIG. The figure which shows the principal part of a tapered roller bearing apparatus in the other example of the 1st sealing apparatus shown in FIG. Sectional drawing which shows the tapered roller bearing apparatus which concerns on other embodiment of this invention. Sectional view showing a conventional tapered roller bearing device Assembly process diagram used to explain defects in conventional examples

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tapered roller bearing apparatus 2 Outer ring 2a 1st track part of outer ring 2b 2nd track part of outer ring 3 Inner shaft 3a Inner shaft part 3b Inner shaft flange part 3f Inner shaft track part 4 Inner ring 4a Inner ring track part 5a Tapered roller in the first row 5b Tapered roller in the second row 6 First cage 7 Second cage 8 First seal device 8a Metal ring of the first seal device 8b Outer seal lip portion of the first seal device 8c First seal Inside seal lip of the device

Claims (3)

An outer ring having first and second track portions;
An inner shaft having a flange portion for attaching a wheel on one end side in the axial direction and having a track portion facing the first track portion;
An inner ring having a track portion that is externally fitted to the outer periphery on the other axial end side of the inner shaft and that faces the second track portion;
A first row of tapered rollers disposed between the first raceway portion of the outer ring and the raceway portion of the inner shaft, and a second row disposed between the second raceway portion of the outer ring and the raceway portion of the inner ring. Conical rollers in a row,
In the tapered roller bearing device for a wheel provided with a cage for equally holding the tapered rollers in each row in the circumferential direction,
An annular body portion that is attached between a flange portion and a raceway portion on the outer peripheral surface of the inner shaft, and a seal that extends radially outward from the body portion and slidably contacts an inner peripheral surface on one axial end side of the outer ring. A tapered roller bearing device for a wheel, comprising a seal device having a lip portion. In the tapered roller bearing device for wheels according to claim 1,
A taper roller bearing device for a wheel, wherein a seal lip portion of the seal device is inclined toward the axial flange portion side from the body portion and extends radially outward. A method for assembling a tapered roller bearing device for a wheel according to claim 1 or 2,
Attaching the sealing device to the outer peripheral surface of the inner shaft;
Disposing the first row of tapered rollers and the cage on the raceway portion of the inner shaft;
A state where the assembly of the inner shaft, the seal device, the first row of tapered rollers and the cage is inserted into the outer ring, and the seal lip portion of the seal device is in sliding contact with the inner peripheral surface on one end side in the axial direction of the outer ring. A method of assembling a tapered roller bearing device for a wheel.

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