CN201963724U - Combined bearing unit of automobile hub - Google Patents

Abstract

The utility model discloses a combined bearing unit of an automobile hub. The combined bearing unit comprises a flange big inner ring, a small inner ring and an outer ring, wherein a turned edge is arranged at the end part of the flange big inner ring, a step is arranged at the neck part of the flange big inner ring, the small inner ring is fixed on a shaft neck between the turned edge and the step through the turned edge, a conical outer raceway is arranged on the step at the neck part of the flange big inner ring, a spherical outer groove is arranged on the small inner ring, a conical inner raceway and a spherical inner groove are arranged on the inner side of the outer ring, a conical roller is arranged between the conical outer raceway and the conical inner groove, and a spherical roller is arranged between the spherical outer groove and the spherical inner groove. By adopting the technical scheme, the inner side row bearing with greater stress is designed into a conical roller type structure, and the outer side row bearing with smaller stress is designed into an angular contact ball bearing structure, so that the bearing unit of the hub is less likely to fail at early stage, meanwhile, the quality risk due to complex processing can be reduced, and the combined bearing unit facilitates the better enhancement of reliability of the bearing unit assembly.

Description

Compound automobile hub bearing

Technical field

The utility model relates to a kind of automobile chassis component, particularly relates to a kind of compound automobile hub bearing.

Background technique

The pivoting support of Hyundai Motor wheel hub, adopted the bearing unit assembly structure mostly, what general small-sized passenger car adopted is the hub-bearing unit assembly of biserial angle contacting ball-type, and commercial vehicle, go-anywhere vehicle and (loading) commercial car adopt cone type hub-bearing unit assembly owing to require bearing capacity higher more.But the friction torque when startup of cone type bearing and operation is bigger, temperature rise is higher, while processing technology complexity, the more ball bearing of difficulty of processing is obviously high, and in actual applications, the force-bearing situation of tapered roller bearing is very complicated, and comprehensively these factors cause the hub-bearing unit of the probability of cone type hub-bearing unit generation early failue apparently higher than the angular contact ball structure.

Simultaneously, the force analysis of automobile hub bearing shows, the four-wheel structure of automobile, and the cantilever support characteristic of wheel, it is not impartial having determined two row rolling elements of hub-bearing unit stressed, therefore the force bearing point that acts on the bearing unit has an inclined to one side square with the geometrical center of bearing, thereby causes the contact stress of two row rolling elements unequal: the inner column rolling element is stressed little, and the outer rows rolling element is stressed greatly.

The model utility content

Technical problem to be solved in the utility model provides a kind of compound automobile hub bearing, can make hub-bearing unit be difficult for taking place early failue, can also reduce simultaneously the quality risk that brings because of processed complex, help better to improve the reliability of unit assembly.

For solving the problems of the technologies described above, the utility model adopts following technological scheme: compound automobile hub bearing, comprise the big inner ring of flange, little inner ring, the outer ring, the big inner ring of described flange end is provided with crimping, the big inner ring neck of described flange is provided with step, described crimping is fixed in described little inner ring on the axle journal between described crimping and the described step, the step of the big inner ring neck of described flange is provided with the outer raceway of a row conical surface, described little inner ring is provided with the outer raceway groove of a row sphere, inboard, described outer ring is provided with raceway and the interior raceway groove of a row sphere in the row conical surface, be provided with tapered roller between the raceway in outer raceway of described conical surface and the described conical surface, be provided with the ball roller between the raceway groove in outer raceway groove of described sphere and the described sphere.

As preferably, the cone angle of described tapered roller is 22 ° 25 ' 9 ", can guarantee enough big axial carrying capacity.

As preferably, the plain line in the bottom surface of raceway is the logarithmic convex curve in outer raceway of described conical surface and the described conical surface, makes hub-bearing unit be difficult for taking place early failue.

As preferably, the plain line in bottom surface of raceway groove is director circle camber sag vertical curve in the outer raceway groove of described sphere and the described sphere, and the friction torque in the time of can effectively reducing bearing unit and move reduces temperature rise and energy consumption.

As preferably, a wherein side of big inner ring of described flange and described outer ring is fixing, and the amount of movement when a loose side is axially moved is-40～+ 30 microns, presets pretension with realization.

As preferably, be arranged with gear ring on the step of the big inner ring of described flange, this gear ring is coupled with wheel speed sensors.

As preferably, be provided with the back-pressure lid and first Sealing between described little inner ring and the outer end, outer ring, to guarantee the sealing between little inner ring and the outer end, outer ring.

As preferably, be provided with second Sealing between the flange root of the inner, described outer ring and the big inner ring of flange, with the sealing between the flange root that guarantees the inner, outer ring and the big inner ring of flange.

The utility model is owing to adopted technique scheme, with stressed bigger inner column design bearing is the tapered roller type, stressed less outer rows is designed to the angular contact ball bearing structure, can effectively reduce the startup of bearing unit assembly and the friction torque in when operation like this, reduce temperature rise, reduce energy consumption, thereby make hub-bearing unit be difficult for taking place early failue, can also reduce simultaneously the quality risk that brings because of processed complex, help better to improve the reliability of unit assembly.

Description of drawings

Fig. 1 is the structural representation of the compound automobile hub bearing of the utility model

Fig. 2 is the schematic representation of the line of the central point of ball roller and interior raceway groove, outer raceway groove point of contact with the angle theta of bearing axis

Embodiment

Below in conjunction with accompanying drawing embodiment of the present utility model is further described.

Figure 1 shows that the compound automobile hub bearing of the utility model, comprise the big inner ring 1 of flange, little inner ring 2, outer ring 3, the big inner ring of described flange 1 end is provided with crimping 12, big inner ring 1 neck of described flange is provided with step 13, described crimping 12 is fixed in described little inner ring 2 on the axle journal 14 between described crimping 12 and the described step 13, the step 13 of the big inner ring neck of described flange is provided with the outer raceway 11 of a row conical surface, described little inner ring 2 is provided with the outer raceway groove 21 of a row sphere, 3 inboards, described outer ring are provided with raceway 31 and the interior raceway groove 32 of a row sphere in the row conical surface, be provided with tapered roller 4 between the raceway 31 in outer raceway 11 of described conical surface and the described conical surface, be provided with ball roller 5 between the raceway groove 32 in outer raceway groove 21 of described sphere and the described sphere.The steel ball component that ball roller 5 and retainer are formed, the roller assembly that tapered roller 4 and retainer are formed, described steel ball component is placed between outer raceway groove 21 of described sphere and the interior raceway groove 32 of described sphere, and described roller assembly is placed between outer raceway 11 of described conical surface and the interior raceway 31 of described conical surface.

The cone angle of described tapered roller 4 is 22 ° 25 ' 9 ".As axial force mainly bear row, reasonably cone angle can guarantee enough big axial carrying capacity, simultaneously and another row angular contact ball bearing make up, comprehensive load capacity reaches optimized effect.

Be arranged with gear ring 6 on the step 13 of the big inner ring of described flange, this gear ring 6 is coupled with wheel speed sensors 7.Be provided with back-pressure lid 8 and first Sealing 9 between described little inner ring 2 and 3 outer ends, outer ring.Be provided with second Sealing 10 between the flange root of 3 the inners, described outer ring and the big inner ring 1 of flange.On the flange of the big inner ring 1 of flange bolt is housed, in order to connect with vehicle driving axle housing, the internal spline of the big inner ring 1 of flange constitutes transmission with the external splines of outer semiaxis.

The outer raceway 11 of described conical surface is the standard logarithmic type dimpling curve that digital control processing forms with the plain line in the bottom surface of the interior raceway 31 of described conical surface:

$C=0.2\·\ln \left[\frac{1}{1.0067-{(\frac{2\·\mathrm{\λ}-1}{k}-1)}^2}\right]$

K is the quantity that raceway is divided into some flakelets in the formula, and λ is the abscissa of flakelet present position.

And the curve of the approximate logarithmic curve shape that the logarithmic curve in the patent 200920137510.8 is the camber line with 32 different curvature to combine.Guarantee under normal load, be evenly distributed along effective contact length upper stress of tapered roller and raceway main supporting surface; Under utmost point heavy load or during roller generation deflection, can eliminate or weaken the stress at rolling surface of contact two ends and concentrate, thereby make hub-bearing unit be difficult for taking place early failue.

The outer raceway groove 21 of described sphere is the director circle camber sag vertical curve that digital control processing forms with the plain line in the bottom surface of the interior raceway groove 32 of described sphere, under the full-load conditions, the line of the central point of ball roller and interior raceway groove, outer raceway groove point of contact accurately is controlled at 35 ° ± 2 ° (as shown in Figure 2) with the angle theta of bearing axis, has prolonged load distribution length to the inboard of bearing unit.

A wherein side of big inner ring 1 of described flange and described outer ring 3 is fixing, amount of movement when a loose side is axially moved is-40～+ 30 microns, at this moment the tapered roller 4 of bearing inside is compacted and be close in the conical surface raceway 31 surfaces and conical surface raceway 11 surfaces outward, and ball 5 just in time is between outer raceway groove 21 of sphere and the interior raceway groove 32 of sphere, the central point of ball roller becomes 35 ° of angles with the line of interior raceway groove, outer raceway groove point of contact with bearing axis, the face that is in contact with one another all is in micro-elastic deformation, realizes presetting pretension.If play is greater than this scope, the rolling surface of contact is not fitted, and bearing does not preset the pretension effect, and each point of contact is not in best stressed position, and bearing unit assembly running moment will increase, and vibration noise may increase, and bearing capacity also can correspondingly descend simultaneously; If play is less than this scope, plastic deformation might take place in the rolling surface of contact, causes surface of contact damage and/or rolling element to stagnate and blocks, and causes whole bearing unit assembly to run well.

Because the automobile hub bearing assembly connects with (outward) semiaxis about vehicle bridge respectively, theoretical calculation shows that when vehicle was kept straight on, the hub-bearing unit outside (by a wheel side) row shaft strength was about 0.5 times of inner column bearing; A large amount of hub bearing failure analysis cases also show, the hub-bearing unit of nearly all operation, its outboard raceway rolling contact vestige all obviously is lighter than inboard raceways, also nearly all is to occur on inboard raceways or the corresponding rolling element if any fatigue flake or wear out failure; Prove also that thus vehicle operating process outer rows shaft strength is significantly less than the inboard really.

Therefore, the compound hub-bearing unit of the utility model is the tapered roller type with stressed bigger inner column design bearing, and stressed less outer rows is designed to the angular contact ball bearing structure.Can effectively reduce the startup of bearing unit assembly and the friction torque in when operation like this, reduce temperature rise, reduce energy consumption, can also reduce the quality risk that brings because of processed complex simultaneously, help better to improve the reliability of unit assembly.

This compound driving wheel hub-bearing unit is applicable to high-grade passenger cars such as commercial vehicle that bearing capacity is had relatively high expectations and go-anywhere vehicle.

The compound automobile hub bearing of the utility model is provided with crimping 12 in the big inner ring of described flange 1 end, big inner ring 1 neck of described flange is provided with step 13, described crimping 12 is fixed in described little inner ring 2 on the axle journal 14 between described crimping 12 and the described step 13, the step 13 of the big inner ring neck of described flange is provided with the outer raceway 11 of a row conical surface, described little inner ring 2 is provided with the outer raceway groove 21 of a row sphere, 3 inboards, described outer ring are provided with raceway 31 and the interior raceway groove 32 of a row sphere in the row conical surface, be provided with tapered roller 4 between the raceway 31 in outer raceway 11 of described conical surface and the described conical surface, be provided with ball roller 5 between the raceway groove 32 in outer raceway groove 21 of described sphere and the described sphere.With stressed bigger inner column design bearing is the tapered roller type, stressed less outer rows is designed to the angular contact ball bearing structure, can effectively reduce the startup of bearing unit assembly and the friction torque in when operation like this, reduce temperature rise, reduce energy consumption, thereby make hub-bearing unit that early failue be difficult for take place, can also reduce the quality risk that brings because of processed complex simultaneously, help better to improve the reliability of unit assembly.

Claims (8)

1. compound automobile hub bearing, comprise the big inner ring of flange (1), little inner ring (2), outer ring (3), it is characterized in that: the big inner ring of described flange (1) end is provided with crimping (12), the big inner ring of described flange (1) neck is provided with step (13), described crimping (12) is fixed in described little inner ring (2) on the axle journal (14) between described crimping (12) and the described step (13), the step (13) of the big inner ring neck of described flange is provided with the outer raceway (11) of a row conical surface, described little inner ring (2) is provided with the outer raceway groove (21) of a row sphere, inboard, described outer ring (3) is provided with raceway (31) and the interior raceway groove (32) of a row sphere in the row conical surface, be provided with tapered roller (4) between the raceway (31) in outer raceway (11) of described conical surface and the described conical surface, be provided with ball roller (5) between the raceway groove (32) in outer raceway groove (21) of described sphere and the described sphere.

2. according to the described compound automobile hub bearing of claim 1, it is characterized in that: the cone angle of described tapered roller (4) is 22 ° 25 ' 9 ".

3. according to the described compound automobile hub bearing of claim 1, it is characterized in that: the plain line in the bottom surface of raceway (31) is the logarithmic convex curve in outer raceway (11) of described conical surface and the described conical surface.

4. according to the described compound automobile hub bearing of claim 1, it is characterized in that: the outer raceway groove (21) of described sphere is director circle camber sag vertical curve with the plain line in the bottom surface of the interior raceway groove (32) of described sphere.

5. according to the described compound automobile hub bearing of claim 1, it is characterized in that: a wherein side of the big inner ring of described flange (1) and described outer ring (3) is fixing, and the amount of movement when a loose side is axially moved is-40～+ 30 microns.

6. according to the described compound automobile hub bearing of claim 1, it is characterized in that: be arranged with gear ring (6) on the step (13) of the big inner ring of described flange, this gear ring (6) is coupled with wheel speed sensors (7).

7. according to the described compound automobile hub bearing of claim 1, it is characterized in that: be provided with back-pressure lid (8) and first Sealing (9) between described little inner ring (2) and the outer end, outer ring (3).

8. according to the described compound automobile hub bearing of claim 1, it is characterized in that: be provided with second Sealing (10) between the flange root of described outer ring (3) the inner and the big inner ring of flange (1).

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