JP2002227849A - Tapered roller bearing retainer and double row tapered roller bearing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate an assembling work of a tapered roller bearing unit by preventing a tapered roller 36 from dropping off from a pocket 40 before the tapered roller 36 is assembled to a periphery of a raceway track 37 of an inner ring. SOLUTION: Projections 42 are formed at both circumferential side surfaces of respective pillar parts 41 and thereby, a small diameter side end of the tapered roller 36 is not removed out from the pocket 40. A large diameter side end is not removed out from the pocket 40 by engaging an engagement projection piece 45 formed on an inner side surface of a rim part 44 with a recessed hole 46 formed on the large diameter side end surface of the tapered roller 36. The retainer 35 is not axially deviated from the raceway track 37 of the inner ring 37 by engaging an engagement projection 47 formed on an inner periphery edge of a flange part 39 with an engagement recessed groove 48 formed on a cylindrical surface part 38 adjacent to the raceway track 37 of the inner ring. Thereby, the purpose is achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-row tapered roller bearing unit which is used, for example, as a vehicle hub unit for rotatably supporting a vehicle wheel with respect to a suspension system, and a double-row tapered roller bearing unit. And improvement with the cage incorporated in the

[0002]

2. Description of the Related Art The wheels of an automobile are rotatably supported on a suspension system by rolling bearings. Further, a heavy automobile wheel is rotatably supported with respect to a suspension system by a double row tapered roller bearing unit. As an invention related to such a double-row tapered roller bearing unit, Japanese Patent Application Laid-Open No. 2000-2000
No. 94902 describes a structure as shown in FIGS. 4 and 5 and an assembling method as shown in FIGS. The vehicle hub unit 1 shown in FIGS. 4 and 5 includes a hub body 2, an inner ring 3, an outer ring 4, and a plurality of first tapered rollers 5, 5 and second tapered rollers 6, respectively. 6 and
It comprises a first seal ring 7 and a second seal ring 8. In the illustrated example, a single seal ring is used as the first seal ring 7 and a combined seal ring is used as the second seal ring 8.

[0003] Of these, the hub body 2 has an outer end portion (the outer side in the axial direction is the outer side in the width direction of the automobile, and is shown in Figs.
Left side of each figure except 1. Same throughout this specification. ) A flange 9 for supporting the wheel is formed on the outer peripheral surface. On the outer peripheral surface of the intermediate portion of the hub main body 2, a first inner raceway 11 having a conical convex shape for forming the first row of tapered roller bearings 10 is directly formed. Further, the inner end portion of the hub body 2 (the inner side in the axial direction is the center side in the width direction of the vehicle and the right side of each of the drawings except for FIGS. 1, 5, and 11; the same applies to the entire specification). Has a small-diameter stepped portion 12. The outer peripheral surface of the small diameter step portion 12 is a cylindrical surface concentric with the hub main body 2. The illustrated example shows an automobile hub unit 1 for supporting drive wheels. For this purpose, a spline hole for engaging an end of a drive shaft with a spline at the center of the hub body 2 is shown. 13 are provided.

[0004] The inner race 3 is used to form a second row of tapered roller bearings 14 for forming a second inner raceway 1 having a conical convex shape.
5 is formed on the outer peripheral surface, and is externally fitted and fixed to the small-diameter step portion 12 of the hub body 2. The inclination direction of the second inner raceway 15 and the inclination direction of the first inner raceway 11 are opposite to each other. The inner end of the inner race 3 is formed by a step surface 16 provided with the outer end of the inner race 3 at the outer end of the small diameter step 12.
, And slightly protrudes from the inner end surface of the hub body 2. In the assembled state to the automobile, the inner end surface of the inner ring 3 projecting from the hub body 2 in this manner has an end surface of a constant velocity joint (not shown) or a step formed at an end of a drive shaft (not shown). The inner ring 3 is prevented from coming out of the small-diameter step portion 12 at the end.

On the inner peripheral surface of the outer ring 4, the first
First and second outer ring raceways 17, 18 each having a tapered concave shape for constituting the second row of tapered roller bearings 10, 14.
Is formed. These first and second outer raceways 17, 18
Are inclined in accordance with the first and second inner raceways 11 and 15. An outer flange-like mounting portion 19 for fixing the outer ring 4 to a suspension device (not shown) is provided at an axially intermediate portion of the outer peripheral surface of the outer ring 4.

The plurality of first tapered rollers 5, 5
Is held by the first retainer 20 so that it can roll freely.
It is arranged between the first inner raceway 11 and the first outer raceway 17. On the other hand, the plurality of second tapered rollers 6, 6 are rotatably held by the second retainer 21, and the second inner raceway 15 and the second outer raceway 1 are held.
8 is arranged.

Each of the first and second cages 20 and 21 holds the plurality of first and second tapered rollers 5 and 6 and the diameter of each of the first and second tapered rollers 5 and 6 is reduced. It has a structure to prevent it from falling off in the direction. That is, the first and second retainers 20 and 21 are formed into a partially conical cylindrical shape by injection molding synthetic resin having elasticity, and each of the first and second retainers 20 and 21 has a plurality of pockets 22 in the circumferential direction. The pillar portions 23 are provided alternately. The respective tapered rollers 5 and 6 are arranged so as to freely roll in the respective pockets 22. The outer peripheral surface of each of the column portions 23 is located diametrically outward of the pitch circle of the first and second tapered rollers 5 and 6. And each of the above pockets 22
The width of the outer diameter side opening in the circumferential direction is smaller than the diameter of each of the tapered rollers 5 and 6.

Therefore, the operation of storing the tapered rollers 5 and 6 in the pockets 22 is performed from the inner diameter side of the first and second retainers 20 and 21. When the tapered rollers 5 and 6 are stored in the pockets 22 and the hub body 2 and the inner ring 3 are inserted into the inner diameter sides of the tapered rollers 5 and 6, the tapered rollers 5 and 6 are inserted into the pockets 22. Each pocket 22 is held undetachably. In the illustrated example, small flanges 24 projecting outward in the diametrical direction are formed at the small-diameter side ends of the first and second inner raceways 11 and 15. Each of the above tapered rollers 5, 6 and each of the above cages 20, 21
Are assembled around the first and second inner raceways 11 and 15 in a set state. When the tapered rollers 5 and 6 pass through the small flange 24 formed at the small-diameter end of each of the inner raceways 11 and 15, the tapered rollers 5 and 6 ride on the small flange 24. Thereby, the retainers 20 and 21 are elastically deformed so as to expand outward. Therefore, in a state where the first and second tapered rollers 5 and 6 are arranged around the first and second inner ring raceways 11 and 15, the first and second tapered rollers 5 and 6 are in the axial direction. Inadvertent displacement is eliminated.

Further, the first seal ring 7 comprises a metal core 25 having a substantially L-shaped cross section, and an elastic material 26 attached to the inner peripheral edge of the metal core 25 over the entire circumference. Such a first seal ring 7 is formed by fitting a cylindrical portion 27 formed on the outer peripheral edge of the cored bar 25 to a cylindrical surface portion 28 formed on the outer peripheral surface of the outer end of the outer race 4 by interference fitting. The outer ring 4 is fixed to the outer end. In addition, a part of the flange 9 facing the outer end surface of the outer ring 4 at a plurality of positions in the circumferential direction (for example, studs 29 fixed to the flange 9).
The same number of jigs 30 as shown in FIGS. 6 to 6) are used to press the cylindrical portion 27 into the cylindrical surface portion 28.
7) is formed.

Next, a method of assembling the automobile hub unit 1 having the above-described structure will be described with reference to FIGS.
6 to 8 will be described. First, as shown in FIG. 6, each of the first tapered rollers 5, 5 is connected to the first cage 2.
0, the hub body 2 is held on the outer diameter side of the first inner raceway 11 on the outer peripheral surface. Prior to this, the first seal ring 7 is externally fitted to the hub main body 2,
The first seal ring 7 is arranged at a portion between the first inner raceway 11 and the flange 9 on the outer peripheral surface of the intermediate portion of the hub body 2. In this state, each of the first tapered rollers 5,
5 is held around the hub body 2 without being separated. Therefore, the transfer operation in the factory can be easily performed.

In this manner, the first tapered rollers 5, 5 are held around the intermediate portion of the hub body 2 and the first seal ring 7 is arranged, as shown in FIGS. Then, the outer ring 4 is made to enter around the hub body 2. As shown in FIG. 7, the first outer raceway 17 is positioned outside the first and second tapered rollers 5 and 5 of the plurality of first and second tapered rollers 5 and 6, respectively. Do until you do. During actual assembly work, the left side in FIGS.

In the illustrated example, the outer ring 4 is advanced around the hub body 2 and the flange 9
The jig 30 inserted through the plurality of through holes 31 formed in
The cylindrical portion 27 formed on the outer peripheral edge of the core metal 25 constituting the first seal ring 7 is externally fitted and fixed to the cylindrical surface portion 28 formed on the outer peripheral surface of the outer end of the outer ring 4. That is, the outer ring 4 is advanced around the hub body 2 while the first seal ring 7 is backed up by the jig 30 fixed to the holding block 32, so that the cylindrical portion 27 is formed.
Is externally fitted and fixed to the cylindrical surface portion 28. The jig 30
Is regulated so that the external fitting fixing operation is completed before an excessive thrust load is applied to the first tapered rollers 5,5. That is, before each of the tapered rollers 5, 5 comes into contact with the first outer ring raceway 17, the inner side surface of the inner ring portion of the core metal 25 constituting the first seal ring 7 is moved outside the outer ring 4. It comes into contact with the end face. This prevents the formation of indentations on the first inner raceway 11 and the first outer raceway 17 associated with a decrease in durability during the assembly operation. In order to prevent infiltration of muddy water from the fitting surface between the cylindrical portion 27 of the cored bar 25 and the cylindrical surface portion 28 provided at the outer end of the outer ring 4, the cylindrical surface portion 28 is ground. , Eliminating the gap between the fitting parts. Also, the portion of the outer peripheral surface of the intermediate portion of the hub main body 2 where the seal lip forming the first seal ring 7 is in slidable contact is reduced in surface roughness by grinding in consideration of the peripheral speed of the portion in use. Finish to a specified value or less (smooth) to prevent wear of the seal lip.

Next, as shown in FIGS. 7 to 8, the inner race 3 is held around the second inner raceway 15 by the second retainer 21, and the plurality of second tapered rollers 6, 6 are held. Then, it is inserted inside the outer ring 4. Then, the inner ring 3 is externally fitted to the small-diameter step portion 12 of the hub main body 2 in accordance with the insertion operation. Finally, as shown in FIGS. 8 to 4, the second seal ring 8 is mounted between the outer peripheral surface of the end of the inner race 3 and the inner peripheral surface of the end of the outer race 4.
The preload applied to the first and second rows of tapered roller bearings 10 and 14 can be adjusted by changing the grinding amount of a part (the tip surface) of the inner ring 3.

In each of the above-described examples, the inner end surface of the inner race 3 is made to protrude from the inner end surface of the hub body 2, and the inner end surface of the inner race 3 is attached to the end surface of a constant velocity joint (not shown) or a drive (not shown). It is configured such that a step formed at the end of the shaft is abutted. On the other hand, as shown in FIG.
The portion of the inner ring 3 is formed by caulking 34 formed by plastically deforming a portion of the inner end of the cylindrical portion 33 formed at the inner end portion of the inner portion protruding inward from the inner end surface of the inner ring 3 radially outward. A structure that suppresses the inner end surface is also considered. The caulking portion 34 is formed by, for example, rocking.

[0015]

When assembling the hub unit 1 for an automobile as described above, the following problems occur. After holding the first and second tapered rollers 5 and 6 in the pockets 22 of the first and second cages 20 and 21, these tapered rollers 5 and 6 are first and second inner ring raceways 11, respectively. These tapered rollers 5 and 6 are likely to fall out of the pocket 22 before being mounted around the periphery of the tapered roller 15. When the small flange portion 24 is omitted from the small diameter side end of each of the first and second inner ring raceways 11, 15, each of the tapered rollers 5,
6 and each of the retainers 20 and 21 to each of the inner raceways 11,
15, the above-mentioned automobile hub unit 1
Prior to the completion of the assembly, the tapered rollers 5, 6 and the retainers 20, 21 are likely to fall off from the periphery of the inner raceways 11, 15.

The above reasons will be described with reference to FIGS. 10 to 11 show a second row of tapered roller bearings 14, a second tapered roller 6,
6 and the second retainer 21 are shown. The same applies to the first tapered rollers 5, 5 and the first retainer 20 that constitute the first row of tapered roller bearings 10. As shown in FIG. 8, the second tapered rollers 6, 6 and the second cage 21
Prior to being mounted on the outer diameter side of the, they are combined with each other as shown in FIG. In the case of the conventional structure, as shown in FIG.
Reference numerals 3 and 23 have a straight shape, and no particular consideration is given to preventing the first tapered rollers 5 and 5 from falling off.
Therefore, until the combined second tapered rollers 6, 6 and the second cage 21 are mounted on the outer diameter side of the inner ring 3, the second tapered rollers 6, 6 are connected to the second cage 2.
In order not to fall off from the first pockets 22, 22, a separate holding jig or the like must be prepared, which is troublesome.

Further, the above-mentioned troubles are caused by omitting the small flange portion 24 in order to reduce the manufacturing cost of the hub unit 1 for an automobile. That is, for the purpose of reducing the manufacturing cost, the first and second inner raceways 11, 15
If the small flange portion 24 is omitted in order to facilitate the grinding of the inner ring raceways 11, 6, the respective tapered rollers 5, 6 become
5 cannot be suppressed from being displaced to the smaller diameter side. As a result, the tapered rollers 5 and 6 and the cages 2
By simply mounting the 0, 21 around the inner raceways 11, 15, the tapered rollers 5, 6 and the cage 2
0 and 21 are likely to fall off from the periphery of each of the inner raceways 11 and 15. It is troublesome to assemble the vehicle hub unit 1 while preventing such a drop-off, and the cost of the vehicle hub unit 1 cannot be sufficiently reduced. The tapered roller bearing retainer and double-row tapered roller bearing unit of the present invention have been invented in view of such circumstances.

[0018]

SUMMARY OF THE INVENTION Among the tapered roller bearing retainers and double-row tapered roller bearing units of the present invention, the tapered roller bearing retainers according to claim 1 are known from the prior art. Like the tapered roller bearing cage,
A plurality of columns arranged at equal intervals in the circumferential direction so as to form a conical cylindrical shape as a whole, and an annular shape in which the large-diameter-side ends of the axial ends of each of the columns are continuous with each other. And a ring-shaped flange portion having a shape bent radially inward from the small-diameter end of each of the pillars, and continuous with the small-diameter ends. Portions surrounded by four sides by both side surfaces of the pillar portion adjacent in the circumferential direction and opposing side surfaces of the rim portion and the flange portion serve as pockets for holding the tapered rollers in a freely rolling manner. The positions of these pockets in the radial direction are located outside the pitch circles of the tapered rollers to be held in these pockets. The width of the outer diameter side opening of each pocket in the circumferential direction is smaller than the diameter of each tapered roller.

In particular, in the tapered roller bearing retainer according to the first aspect, the inner peripheral edge of the flange portion is located radially inward of the pitch circle. In addition, a convex portion that protrudes in the circumferential direction is provided in a portion from the inner diameter portion on the inner surface of the flange portion to the small-diameter side end portion on both circumferential sides of each of the column portions. The distance between the leading edges of the convex portions facing each other via the pockets is set smaller than the outer diameter of the small-diameter end portion of each of the tapered rollers.
Preferably, a large-diameter end face of a tapered roller held in each of the pockets is provided at a portion of the inner surface of the rim portion located at the center in the circumferential direction of each of the pockets. An engaging projection that engages with the concave hole formed in the central portion is formed. More preferably, a locking ridge is formed so as to protrude from an inner peripheral edge of the flange portion.

On the other hand, the double-row tapered roller bearing unit according to the fourth aspect of the present invention has a hub body and an outer fitting fixed to the hub body, similarly to the conventionally known double-row tapered roller bearing unit. An inner ring, an outer ring disposed around the hub body and the inner ring, and a plurality of first and second tapered rollers provided between the outer peripheral surface of the hub body and the inner ring and the inner peripheral surface of the outer ring, respectively. Consisting of
The hub body has a first inner ring raceway having a tapered convex shape for forming a first row of tapered roller bearings on an outer peripheral surface of an intermediate portion, and a small-diameter step portion provided on an outer peripheral surface of an inner end portion.
Further, the inner ring is formed by forming a second inner ring raceway having a conical convex shape on an outer peripheral surface to constitute a second row of tapered roller bearings. It is externally fitted and fixed in a state where it abuts against a step surface provided at the outer end of the step. Further, the outer ring is formed such that the first and second outer ring raceways, each having a tapered concave shape, for forming the first and second rows of tapered roller bearings are formed on the inner peripheral surface. or,
Each of the first tapered rollers is disposed between the first inner raceway and the first outer raceway while being held by a first cage so as to be freely rotatable. Further, each of the second tapered rollers is disposed between the second inner raceway and the second outer raceway while being held in a freely rotatable manner by a second cage. The first inner ring raceway is formed directly on the outer peripheral surface of the intermediate portion of the hub main body, and is separate from the hub main body, and is formed on the outer peripheral surface of another inner ring which is externally fitted to the intermediate portion of the hub main body. It may be formed. In this case, the inner end surface of the other inner ring becomes the step surface.

In particular, in the double-row tapered roller bearing unit of the present invention, the small-diameter end portions of the first and second inner raceways are axially moved directly from the small-diameter end portions of the two inner raceways. There is a continuous cylindrical surface. In other words, the small-diameter end portions of the first and second inner ring raceways are not provided with the small flange portions as in the conventional structure described above. Instead, a locking groove is formed on each of the cylindrical surfaces over the entire circumference. Further, the tapered roller bearing retainer described in claim 3 is used as each of the first and second retainers. A locking ridge protruding from the inner peripheral edge of each flange portion is engaged with each of the locking grooves so as to be freely displaceable in the circumferential direction.

[0022]

According to the tapered roller bearing retainer and the double-row tapered roller bearing unit of the present invention as described above, according to the tapered roller bearing retainer, the small diameter side end of the tapered roller held in each pocket is formed. Each of the tapered rollers can be prevented from slipping out of each of the pockets by being embraced by a convex portion formed on the side surface of each column. Therefore, the tapered rollers can be held in the pockets without using a holding jig or the like, thereby facilitating the assembly operation of the tapered roller bearing.

Further, in the case of the double row tapered roller bearing unit of the present invention, in order to facilitate the grinding of the first and second inner raceways, even if the inner flange is omitted in the structure, the inner races are omitted. It is possible to prevent the first and second retainers installed around the track from moving off the periphery of each inner ring track. Because of this,
After installing the first and second cages and the first and second tapered rollers around each of these inner ring raceways, the trouble of holding down each of these members is eliminated, and the double-row tapered roller bearing unit is The assembling work can be facilitated.

[0024]

1 to 3 show an embodiment of the present invention corresponding to all of the first to fourth aspects.
The feature of the present invention is that the shape of the cage 35 integrally formed by injection molding of synthetic resin is devised to prevent the cage 35 from being separated from the tapered rollers 36. In order to facilitate grinding, this inner ring raceway 3
Even when the cylindrical surface portion 38 is formed continuously from the small-diameter side end portion 7, the shape of the cylindrical surface portion 38 and the retainer 35 is devised, so that the retainer 35 and the conical This is to prevent the rollers 36 from falling off. The overall configuration of the hub unit 1 for a vehicle, which is a double-row tapered roller bearing unit, is the same as that of the conventional structure described above, and therefore, duplicated illustration and description are omitted, and the following description focuses on the features of the present invention. explain.

The inner peripheral edge of the flange portion 39 formed at the small-diameter end of the retainer 35 is disposed around the inner raceway 37 while being retained in the pockets 40, 40 of the retainer 35. The tapered rollers 36 are located radially inward of the pitch circle of the tapered rollers 36. Also, convex portions 42, 42 protruding in the circumferential direction are provided on portions from the inner diameter portion on the inner surface of the flange portion 39 to the small diameter side end portions on both circumferential sides of the respective column portions 41, 41. I have. Then, the convex portions 42, 42 facing each other via the respective pockets 40, 40
The distance between the leading edges in the circumferential direction is smaller than the outer diameter of the small-diameter side end of each of the tapered rollers 36.

That is, at a part of the inner surface of the flange portion 39, the phase in the circumferential direction coincides with the column portions 41, 41, and the position in the radial direction is the small-diameter end of each of the column portions 41, 41. Rib-shaped holding portions 43 are provided at portions located radially inward of the portions. The width (thickness) of each of the holding portions 43, 43 in the circumferential direction coincides with each of the column portions 41, 41 at the outer diameter side end portion, and increases toward the radially inward side. Therefore, the holding portions 43, 43
Are projecting into the pockets 40, 40 beyond both circumferential sides of the pillars 41, 41. Each of the convex portions 42, 42 is provided with such a holding portion 4 as described above.
Each of the pockets 40, 40 at the circumferential ends of the pockets 3, 43
It is the part that protrudes inside.

The small-diameter end of each of the tapered rollers 36 enters between the holding portions 43, 43. In this manner, the operation of inserting the tapered rollers 36 between the holding portions 43, 43 is performed while the column portions 41, 41 are elastically deformed in the circumferential direction. After being inserted, these pillars 41, 41 are elastically restored, and the distance between the leading edges of the projections 42, 42 facing each other via the pockets 40, 40 is set to It becomes smaller than the outer diameter of the tapered roller 36 at the small diameter side end. Therefore, the tapered rollers 36 do not accidentally fall out of the pockets 40, 40.

In the case of this example, each of the pillars 41, 4
An annular rim portion 4 connecting the large-diameter-side end portions 1 to each other
An engagement protrusion 45 is formed on the inner side surface of each of the pockets 40, 40 at a portion located at the center in the circumferential direction of each of the pockets 40, 40. With the tapered rollers 36 held in the pockets 40, 40, the engaging projections 45 engage with circular recesses 46 formed in the center of the large-diameter side end surfaces of the tapered rollers 36. Engage. For this reason, in the illustrated example, the large-diameter end of each of the tapered rollers 36 is connected to each of the pockets 40,
The tapered roller 3 from each of the pockets 40, 40 is prevented from being displaced in the
6, 6 and 36 are securely prevented from falling off.

Further, a locking projection 47 is formed at the axially central portion of the inner peripheral edge of the flange portion 39 so as to protrude over the entire circumference or intermittently in the circumferential direction. On the other hand, at the small-diameter end of the inner raceway 37, there is a cylindrical surface portion 38 that continues in the axial direction as it is from the small-diameter end of the inner raceway 37. In other words, the small-diameter end of the inner raceway 37 is not provided with the small flange portion 24 (for example, see FIG. 4) as in the conventional structure described above. Instead, a locking groove 48 is formed in each cylindrical surface 38 over the entire circumference. The width of the locking groove 48 is wider than the width of the locking ridge 47 so that the locking ridge 47 is loosely engaged in the locking groove 48. Therefore, this locking ridge 4
Numeral 7 is engaged with this locking groove 48 so as to be freely displaceable in the circumferential direction. The position of the locking projection 47 in the case where it is formed intermittently in the circumferential direction is arbitrary. For example, it is formed in a portion where the phase in the circumferential direction coincides with the column portions 41, 41.

According to the tapered roller bearing retainer and the double-row tapered roller bearing unit of the present embodiment as described above, the small-diameter end portion of each of the tapered rollers 36 held in each of the pockets 40, 40 is connected to the small-diameter end. The respective tapered rollers 36 can be prevented from falling out of the respective pockets 40, 40 by being embraced by the respective convex portions 42, 42 formed on the side surfaces of the respective column portions 41, 41. Therefore, the tapered rollers 36 can be inserted into the pockets 40, 4 and 4 without using a holding jig or the like.
0, the tapered roller bearing can be easily assembled. Further, in the illustrated example, each of the tapered rollers 36 not only has its small-diameter side end restrained by each of the projections 42, 42, but also has its large-diameter side end connected to each of the engaging projections 45. Engagement with the concave hole 46 suppresses displacement in the direction of coming out of the pockets 40, 40. Accordingly, it is possible to more reliably prevent the tapered rollers 36 from dropping out of the pockets 40, 40. Moreover, in the state where the tapered roller bearing unit is assembled, each of the projections 42 is also connected to each of the engagement projections 45.
However, there is no resistance to the rolling of the tapered rollers 36.

Further, in the case of the tapered roller bearing unit of the present invention which is constructed by incorporating the above-described retainer 35, the small flange portion 24 is omitted in order to facilitate the grinding of the inner raceway 37. Even in the case of the structure having the cylindrical surface portion 38, the retainer 35 installed around the inner raceway 37 is also used.
Can be prevented from moving from the periphery of the inner raceway 37. That is, the locking ridge 47 formed on the inner peripheral edge of the flange portion 39 and the locking groove 4 formed on the cylindrical surface portion 38.
After the retainer 35 and the tapered rollers 36 are installed around the inner raceway 37 based on the engagement with the inner ring 8, it is no longer necessary to hold down these members 35 and 36,
This facilitates the assembly work of the tapered roller bearing unit. Since the locking projection 47 is engaged with the locking groove 48 so as to be freely displaceable in the circumferential direction, in a state where the tapered roller bearing unit is assembled, the locking projection 47 and the locking recess are formed. The engagement portion with the groove 48 does not become a resistance to the operation of the tapered roller bearing unit.

[0032]

The tapered roller bearing retainer and double-row tapered roller bearing unit of the present invention are constructed and operated as described above, thus contributing to cost reduction of double-row tapered roller bearing units such as automobile hub units. it can.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing one example of an embodiment of the present invention, in which a part of a small-diameter side end of a retainer is viewed from an inner diameter side.

FIG. 2 is a sectional view taken along the line AA of FIG. 1, showing a state in which a tapered roller is held in a pocket.

FIG. 3 is a sectional view showing a state in which a cage and tapered rollers are installed around an inner raceway.

FIG. 4 is a cross-sectional view showing a first example of an automobile hub unit which is a double-row tapered roller bearing unit to which the present invention is applied.

FIG. 5 is a half side view as viewed from the right side of FIG. 4;

FIG. 6 is a sectional view showing the first step of the assembly operation.

FIG. 7 is a cross-sectional view showing the next step.

FIG. 8 is a cross-sectional view showing the next step.

FIG. 9 is a cross-sectional view showing a second example of an automobile hub unit which is a double-row tapered roller bearing unit to which the present invention is applied.

FIG. 10 is a cross-sectional view showing a second tapered roller and a second cage that constitute a second-row tapered roller bearing having a conventional structure.

FIG. 11 is a view taken in the direction of arrow B in FIG. 10, showing only the retainer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automobile hub unit 2, 2a Hub main body 3 Inner ring 4 Outer ring 5 First tapered roller 6 Second tapered roller 7 First seal ring 8 Second seal ring 9 Flange 10 First row tapered roller bearing 11 First inner ring raceway 12 Small-diameter stepped portion 13 Spline hole 14 Second row of tapered roller bearings 15 Second inner raceway 16 Stepped surface 17 First outer raceway 18 Second outer raceway 19 Mounting portion 20 First retainer 21 Second retainer 22 Pocket 23 Column portion 24 Small flange portion 25 Core metal 26 Elastic material 27 Cylindrical portion 28 Cylindrical surface portion 29 Stud 30 Jig 31 Through hole 32 Suppression block 33 Cylindrical portion 34 Caulking portion 35 Cage 36 Tapered roller 37 Inner raceway 38 Cylindrical surface portion 39 Flange portion 40 Pocket 41 pillar portion 42 convex portion 43 holding portion 44 rim portion 45 engaging projection 46 concave hole 47 locking projection 48 Stop groove

Claims (4)

[Claims] 1. A plurality of pillars arranged at equal intervals in the circumferential direction so as to form a conical cylindrical shape as a whole, and large-diameter-side ends of axial ends of each of these pillars are connected to each other. An annular rim portion, which has a shape bent radially inward from the small-diameter end of each of the column portions, and has an annular flange portion continuous with the small-diameter end portions, The portions surrounded by the four sides by both side surfaces of the pillar portion adjacent in the circumferential direction and the opposing side surfaces of the rim portion and the flange portion are formed as pockets for holding the tapered rollers in a freely rolling manner, and The position of each of these pockets is located outside the pitch circle of each of said tapered rollers to be held in each of said pockets, and the width of the outer diameter side opening of each of these pockets in the circumferential direction is set to be the above-mentioned cone. Smaller than roller diameter In the tapered roller bearing retainer described above, the inner peripheral edge of the flange portion exists radially inward from the pitch circle, and the circle of each of the column portions extends from a portion of the inner surface of the flange portion closer to the inner diameter. Around the small-diameter end portion of each of the circumferential side surfaces, a convex portion protruding in the circumferential direction is provided, and the interval between the leading edges of the convex portions facing each other through the pockets is set to the distance between the tapered rollers. Tapered roller bearing retainer characterized in that it is smaller than the outer diameter of the small diameter end. 2. A recess formed in a central portion of a large-diameter end surface of a tapered roller held in each of the pockets on a portion of the inner surface of the rim portion located at a central portion in a circumferential direction of each of the pockets. The tapered roller bearing retainer according to claim 1, wherein the engaging projection is formed. 3. The tapered roller bearing retainer according to claim 1, wherein a locking ridge is projected from an inner peripheral edge of the flange portion. 4. A hub body, an inner ring externally fitted to and fixed to the hub body, an outer ring disposed around the hub body and the inner ring, and an outer peripheral surface of the hub body and the inner ring and an inner peripheral surface of the outer ring. And a plurality of first tapered rollers and a second tapered roller, each of which has a hub body,
A first conical convex inner raceway for forming a first row of tapered roller bearings on the outer peripheral surface of the intermediate portion, a small-diameter step portion is provided on the outer peripheral surface of the inner end, and the inner race is provided in the second row. The tapered roller bearing is formed with a tapered convex second inner ring raceway formed on the outer peripheral surface, and the outer end surface is provided at the outer end of the small diameter step of the hub body. The outer ring is fixed in the state of being abutted against the step surface, and the outer ring is formed on the inner peripheral surface of the first and second rows of tapered roller bearings.
The first and second outer ring raceways each have a conical concave shape, and each of the first tapered rollers is rotatably held by a first retainer while the first inner raceway and the first inner raceway are in contact with each other. The second tapered rollers are arranged between the second inner raceway and the second outer raceway in a state where the second tapered rollers are rotatably held by a second retainer. In the row tapered roller bearing unit, at the small-diameter side ends of the first and second inner ring raceways, there is a cylindrical surface portion that is directly continuous in the axial direction from the small-diameter side ends of these two inner ring raceways, and these A locking concave groove is formed on each cylindrical surface portion over the entire circumference, and the first and second cages are
4. The tapered roller bearing retainer according to claim 3, wherein a locking ridge protruding from an inner peripheral edge of each flange portion is circumferentially displaceably engaged in each of the locking grooves. Double row tapered roller bearing unit characterized by the fact that