CN104470733B - Wheel draft hitch for the back axle of vehicle - Google Patents

Abstract

The present invention relates to wheel draft hitch (10) of a kind of back axle for vehicle, have: wheel hub bracket (20) that can turn in wobble area, for fixing vehicle wheel (100)；And for multiple control arms (31,32,33,34,35) that wheel hub bracket (20) is hinged on the vehicle body (200) of vehicle；Also have for suppressing the wheel hub bracket (20) vibration absorber (40) relative to the motion of vehicle body (200).Vibration absorber (40) is by wheel hub cradle coupler (42) and wheel hub bracket (20), during wherein wheel hub cradle coupler (42) is arranged in the join domain (50) in the wheel space (110) limited by the wobble area of wheel hub bracket (20) of wheel (100), described in all regions towards vehicle body (200) of wheel space (110), join domain has the maximum direct spacing to vehicle body (200).

Description

Wheel draft hitch for the back axle of vehicle

Technical field

The present invention relates to the wheel draft hitch of a kind of back axle for vehicle, the back axle of a kind of vehicle and A kind of for the wheel hub cradle coupler of vibration absorber being positioned in the wheel draft hitch of vehicle Method.

Background technology

Wheel draft hitch for vehicle is essentially known.Such as, DE 10 2,010 030 292 A1 Basically describe this back axle.The most it is known that the back axle of vehicle or take turns suspension accordingly Device is designed as turning to.The back axle that this rear wheel draft hitch turned to maybe can turn to excellent Point is, also can realize when vehicle dimension is bigger following the tracks of (trace holding) or narrower turning easily Curved radius and narrower turn to circle.Roadability can also be improved by the back axle that can turn to.EP 2 423 009 A1 discloses a kind of vehicle rear axle, wherein uses vibroshock and the spring of combination.US 5,292,149 Disclose a kind of dress for wheel of vehicle to be carried out Active Compensation with reference to the orientation angle of wheel suspension device Put.

But the known back axle turned to or in the wheel draft hitch turned to of back axle unfavorable Part is, it is unfavorable for the width dimensions chain (Breitenmasskette) of vehicle.Therefore, it is stipulated that The steering response of the wheel draft hitch of back axle is it is meant that must widen the rut of vehicle or must reduce Loading extended area between two outer wheels draft hitch.Load extended area and reduce the row making vehicle The delivered payload capability of Lee room reduces.Rut is widened so that the aerodynamic situation of vehicle is deteriorated and also part Ground because outward appearance reason but disadvantageous.Therefore, the necessity intervening width dimensions chain is, due to The steering response of wheel draft hitch can make the wheel being fixed on wheel draft hitch transport in wheel space Dynamic.This movement is around the axle relative to vehicle vertical orientation, the i.e. swing of steering spindle.By This adjusted wheel space prevents, and can damage the technology work to wheel draft hitch in this takes turns space The interior fittings that energy property is necessary.Therefore, it is necessary that tolerate rut in known wheel draft hitch Widen, in order to the technical functionality of entirety, especially vibration damping and springing can also be kept in desired mode Performance.

Summary of the invention

Therefore, it is an object of the invention to, propose a kind of back axle for vehicle wheel draft hitch, This back axle of vehicle and the wheel hub torr of a kind of corresponding vibration absorber for the back axle to vehicle The method that frame connector is attached, described takes turns draft hitch, back axle and method at least in part gram Take aforesaid drawbacks.The purpose of the present invention in particular, in that, propose a kind of back axle for vehicle wheel hang Rack device, this back axle of vehicle and the wheel hub of a kind of vibration absorber for the back axle to vehicle Cradle coupler carries out the method positioned, and described draft hitch, back axle and the method for taking turns is with inexpensive and simple Single mode provides back axle that have the least space requirement, that can turn to.

Above-mentioned purpose fills by having the wheel suspension of the back axle for vehicle of feature described in claim 1 Put, have the back axle of the vehicle of feature described in claim 9 and there is feature described in claim 10 Realize for method that wheel hub cradle coupler is positioned.By dependent claims, description With further feature and the details that accompanying drawing obtains the present invention.Fill here, combine the wheel suspension according to the present invention Put the feature of description and details to work as when combining the method according to the invention and according to the back axle of the present invention The most equally applicable, and correspondingly vice versa, thus begin relative to the disclosure of each inventive aspect Eventually can mutually reference.

The wheel draft hitch of the back axle for vehicle according to the present invention has and can turn in wobble area , for the wheel hub bracket of fixing vehicle wheel.Additionally, be additionally provided with for wheel hub bracket is hinged on vehicle Vehicle body on multiple control arms.Additionally, also have for wheel hub bracket is entered relative to the motion of vehicle body The vibration absorber of row decay.Here, vibration absorber is connected with wheel hub bracket by wheel hub cradle coupler. The salient point of the wheel draft hitch according to the present invention is that wheel hub cradle coupler is arranged in by wheel hub torr In the following join domain of the surface segment in the vehicle wheel space that the wobble area of frame limits: this connection The region of the direct spacing maximum of all region middle-range vehicle bodies in the face of vehicle body in Shi Lun space, region.

Wheel draft hitch according to the present invention is preferably designed for five link-type wheel draft hitch, i.e. has five Individual different control arm is for being hinged on wheel hub bracket the vehicle body of vehicle.Its especially two laterally Control arm, two longitudinal control arms and track rod or control pull bar.Certainly suspension is taken turns in principle Device can have drive shaft, the most powered wheel hub bracket.

According to the present invention it is essential that wheel hub cradle coupler is arranged in the join domain of regulation.For This, the vehicle wheel space that observable is limited by the wobble area of wheel hub bracket.If wheel is fixed on wheel On hub bracket, then can be allowed in wobble area carry out oscillating motion by making wheel hub bracket turn to, I.e. there is the swing for making wheel steering.If at two extreme position (wheel hubs that can turn to The complete left stopper section of bracket and complete right stopper section) between all motions and the springing of axle carry out Investigate and all positions are stacked up, then producing and so-called take turns space, at the wheel hub bracket that can turn to Wobble area extreme case between all motion conditions in, wheel all takes turns space without departing from this. In other words, it is possible to all sections occupied by wheel are all located at this and take turns interior volume, and this takes turns space Outside all regions all can not be occupied by wheel.

According to the present invention, make the region towards automobile body, the wheel space, i.e. surface segment is compared to each other. Here, compare based on " directly " distance values with vehicle body.Each region of vehicle is according to the observation Direction has the different spacing to vehicle body.In the sense of the present invention, direct spacing is construed as: Spacing the shortest in all these possible spacing.Therefore, to taking turns each towards vehicle car of space For the region of body, it may be determined that this clear and definite direct spacing.This spacing can also be defined to this region And the shortest possible spacing between automobile body.According to the present invention, there is the region of maximum directly spacing It is selected as join domain.This maximum to automobile body directly makes to cause there is wheel space and car The local of maximum free space between body limits join domain.Therefore, along the side of width dimensions chain It has been accurately defined following position: should to by the maximum free space between wheel space and vehicle body Position provides the structure space degree of depth of maximum possible for arranging other assembly.Thus, in this district Territory provides maximum structure space for, especially arrange in this structure space vibration absorber with And can be connected with the wheel hub cradle coupler on vibration absorber.

According to the present invention, vibration absorber can pass through wheel hub cradle coupler and wheel hub in this way Bracket connects at following location: this position maintains by making operational structure space maximum Rut width also maintains the loading extended range for vehicle.Therefore vehicle can not changed There is provided in the case of basic physical dimension flexibly back axle for and while at spring and especially vibration damping Device aspect keeps known functional.

According to the present invention, wheel hub cradle coupler can directly be connected with wheel hub bracket, it is also possible to indirectly It is connected with wheel hub bracket.Therefore, it can by such as form is to connect the wheel hub cradle coupler of eyelet Vibration absorber is connected directly between on wheel hub bracket.Vibration absorber can also by means of wheel draft hitch even It is connected on one of control arm above and and then to be indirectly connected with wheel hub bracket by this control arm.

In the sense of the present invention, the wheel hub bracket that the wheel hub bracket that can turn to is following, this is taken turns Hub bracket is swingable in the wobble area to back axle.Such as, this wobble area is at the model of about ± 5 ° In enclosing.

Achieved by the arrangement according to the invention of vibration absorber or especially wheel hub cradle coupler, Vibration absorber is most preferably arranged between wheel space and vehicle body at the aspect that utilizes of structure space, thus has Avoid to effect the collision between vehicle and vibration absorber and make available structure space maximum simultaneously Change.

According to the present invention, direct spacing is perpendicular to the most vertically or is substantially perpendicular to the row of vehicle Sail direction.This may also be referred to as the transverse axis of vehicle.Preferably this direct spacing is along wheel draft hitch, i.e. The drive shaft of the wheel of wheel hub bracket or driving universal drive shaft (if this driving universal drive shaft exists) Direction orientation.

According to the present invention, the swing carried out in wobble area be make wheel steering for wheel hub bracket With should be made a distinction by the upper and lower motion of wheel that vibration absorber is decayed.

According to the present invention, at the most circular internal annulus (ring cyclide) closed in other words Wheel space in, through wheel hub cradle coupler be connected to take turns space smallest size of region in along car Laterally carry out.Preferably define saddle type position or saddle region by wheel space, this saddle type position Or saddle region is defined to join domain according to the present invention.

It is advantageous that in the wheel draft hitch according to the present invention, by the wobble area of wheel hub bracket The vehicle wheel space limited can be designed as or substantial symmetry symmetrical about symmetrical plane.Here, subtract The wheel hub cradle coupler of vibrating device is arranged in this symmetrical plane or is arranged substantially at this symmetrical plane In.Thus, in terms of vehicle dynamics, particularly advantageous arrangement is created.About wheel hub bracket One of wobble area, multiple or all take turns in position, the rotary shaft of wheel also is located in this axis of symmetry. Being also advantageous in that of symmetrical design, it is provided that the extra maximized structure between wheel space and vehicle body is empty Between for.Therefore, during join domain is similarly positioned in this symmetrical plane or in the region of this symmetrical plane. This join domain especially can be regarded as having the least dimensioning relative to the overall size on the surface in wheel space Very little.Especially can be regarded as the region of substantially point-like, this region is defined to join domain.But because In real embodiment, the connection (the most not having arbitrary area size) of point-like is impossible, So join domain is especially it can be appreciated that minimum possible area size and/or volume size, this chi Very little is necessary for the power transmission between wheel hub cradle coupler with wheel hub bracket is connected.

Another advantage is, in the wheel draft hitch according to the present invention, with vibration absorber dividually On the opposed side of vibration absorber, arrange that a spring assembly is for wheel hub torr relative to wheel hub bracket Frame is decayed relative to the motion of vehicle body.In other words, according to present invention achieves spring function with Separating of damping function.Generally spring is significantly greater than vibration damping dress in diametrically opposite physical dimension direction The diameter put.Achieved extraly along height dimension chain by cut-out spring device and vibration absorber Advantage.Therefore, the wheel draft hitch according to the present invention can be by additionally realizing in width dimensions chain Structure space in the size that realizes in height dimension chain of separation between vibration absorber and spring assembly subtract Little, thus obtain space in the direction or reduce the space requirement taking turns draft hitch according to the present invention.

It is also advantageous that in the wheel draft hitch according to the present invention (as mentioned above), control arm One of there is the receptacle of peviform, this receptacle supports spring assembly.Therefore avoid for bullet The extra supporting arrangement of spring device.Thus reduce materials demand and first make the wheel according to the present invention hang Rack device weight reduces.The receptacle of this peviform is for providing support for spring assembly.

It is also advantageous that according in the wheel draft hitch one of two aforementioned claim Suo Shu, Vibration absorber be supported in same control arm with spring assembly or on.The most also material cost is made to reduce also Make the wheel draft hitch weight reduction according to the present invention.Furthermore, it is possible to realize by vibration absorber and spring The design of the simplification of the combination that device is formed or the response performance of improvement.With known wheel draft hitch Component is compared, it is only necessary to each control arm adaptive, so as to provide for vibration absorber and spring dress The desired bearing position put.In view of the connection between wheel hub cradle coupler and wheel hub bracket, this Embodiment is indirectly to connect, i.e. a part by means of corresponding control arm is attached.

It is also advantageous that in the wheel draft hitch according to the present invention, at least one in control arm Having the section of bending, this section for vibration absorber offer structure space and/or is vibration damping by bending section Device structure for amplifying space.The control arm of bending bends particularly along following direction: make the arc of its bending section The direction of the control arm that line round dot is positioned at towards the region defining join domain.In other words, control The region of the bending of arm processed bends with deviating from join domain.Therefore, structure space amplifies or achieves Structure space for vibration absorber.It is achieved in that, particularly in view of the location of wheel hub cradle coupler, Vibration absorber moves further towards wheel space because vibration absorber, especially damper piston or There is not the structure space with one of control arm and interfere in other geometric properties of vibroshock cylinder.

It is also advantageous that, in the wheel draft hitch according to the present invention, it is arranged so as to wheel hub bracket even Fitting, the i.e. stroke of wheel hub bracket and subtracting of simultaneously producing in wheel is relative to the relative motion of vehicle body Ratio between the stroke of vibrating device is more than 0.5:1, preferably greater than 0.6:1, especially greater than 0.7:1, And preferably greater than 0.8:1.This design is by the location to wheel hub cradle coupler according to the present invention Just realize.Can carry out between vibration absorber and wheel hub bracket the most in this way is the most close The connection of wheel.Do so is advantageous particularly, because improving the response characteristic of vibroshock.Can also be more Simply and more inexpensively design vibration absorber, because this vibration absorber can provide bigger stroke and enter And the vibration damping of improvement is provided.

When being provided with the drive shaft for drive hub bracket in the wheel draft hitch according to the present invention Time, obtain another advantage.Herein relate to the wheel draft hitch of drive-type or relate to when for back axle The driving back axle of vehicle.In non-driven, the most passive back axle can also use root the most in principle Wheel draft hitch according to the present invention.This driving is preferably carried out by the drive shaft that form is universal drive shaft, should Drive shaft is connected with the driving means of vehicle.

Vibration absorber is the most equally utilized to realize along subtracting in the wheel draft hitch according to the present invention Shake the vibration damping of axis, wherein vibration damping axis from the vertical curve of vehicle relative to vehicle travel direction backward And/or towards body sway.Also mentioning so-called spring at this and tilt parameter, its decision design is at about 6 ° In the range of about 8 °.In other words, thus, vibration absorber and and then vibration damping axis also relative to car Inwardly and tilt backwards.Therefore, centre and the top section of vibration absorber has deviated from wheel space and has inclined Tiltedly, thus mainly for the wheel hub bracket of compresses lower section, especially vibration absorber in terms of structure space Connector exists interference may.The remainder of vibration absorber deviates from wheel space and tilts, thus in location Time, the most preferably it is based only upon wheel hub cradle coupler and parameter is designed.Additionally, by by Tilt adjusting of parameter in spring and produce the vibration damping improved, especially when grinding too small barrier, because Efficiently avoid obstruction wheel.

When the wheel hub bracket that can turn in the wheel draft hitch according to the present invention is for about swinging axle Symmetrical or almost symmetry wobble area designs, and obtains another advantage.This wobble area especially sets It is calculated as in the range of about ± 5 °.Especially when on the both sides being used in back axle, i.e. for two wheel suspension dresses When putting, this symmetric design of wobble area is favourable.Therefore, the swing of correspondence is provided in both sides Region for, even if thus in the complete amplitude of both sides, also wheel hub bracket is carried out identical tune Joint and and then provide identical wheel orientation angle.Which improve flexible driving, and swing district The extreme position in territory does not haves the skidding between two wheels of back axle.Because after this relates to turning to Bridge, therefore it is only used for assisted diversion in principle, puts completely without providing as vehicle propons Dynamic region.

Another theme of the present invention is the back axle of vehicle, this back axle have left side wheel draft hitch and The wheel draft hitch on right side, wherein the two wheel draft hitch designs according to the present invention.Correspondingly, root According to the back axle of the present invention have referring in detail to according to the present invention wheel draft hitch illustrated identical Those advantages.Two wheel draft hitch in the both sides of the back axle of vehicle are the most identical or substantially the same, I.e. there is identical or substantially the same feature.

Subject of the present invention also resides in a kind of for positioning the wheel hub cradle coupler of vibration absorber Method, described wheel hub cradle coupler is for the wheel hub bracket with the wheel draft hitch of fixing vehicle wheel even Connecing, this wheel hub bracket can turn in a wobble area, and described method has following steps:

-determine the vehicle wheel space limited by the wobble area of wheel hub bracket；

-determining the following join domain of surface segment in wheel space: this join domain is the face in wheel space The region maximum to the direct spacing of all regions middle-range vehicle body of vehicle body, and

-wheel hub cradle coupler is positioned in join domain.

Preceding method is in view of its step is especially for the wheel draft hitch according to the present invention.Here, preferably Relating to a kind of building method, this building method must also perform wheel hub bracket in wheel draft hitch and connect The location of part.Can be manual, it is also possible to semi-automatic or fully automatically carry out take turns space determination.If Wheel hub bracket completes structure, then can be by being fixed on the wobble area of the wheel on wheel hub bracket at warp In the skimulated motion of the wobble area crossing wheel, i.e. limit wheel when wheel swings on wheel hub bracket Wheel space.In view of the direct spacing away from vehicle body region checks that this takes turns space.Maximum direct spacing is real Show the max architecture space between wheel space and vehicle body, thus define join domain there.Connect In this join domain, in described structure, located wheel hub cradle coupler.Side according to the present invention Method preferably can be used in the structure of the wheel draft hitch according to the present invention.Correspondingly, according to the present invention's Method brings and the identical advantage having been described in reference to the wheel draft hitch according to the present invention.

Accompanying drawing explanation

Further describe the present invention with reference to the accompanying drawings, its improvement project and its advantage.Accompanying drawing is illustrated respectively Property illustrates:

Fig. 1 illustrates the first embodiment taking turns draft hitch according to the present invention with top view；

Fig. 2 illustrates that the present invention according to Fig. 1 takes turns draft hitch together with the wheel space drawn and wheel Extreme position；And

Fig. 3 illustrates the embodiment of Fig. 1 and 2 with rearview.

Detailed description of the invention

The element with identical function and model of action is respectively provided with identical reference mark in Fig. 1 is to 3 Note.

Referring to figs. 1 to 3, the embodiment taking turns draft hitch 10 according to the present invention is described.This takes turns suspension Device 10 is five link-type wheel draft hitch, because being provided with five control arms 31,32,33,34 With 35.Preferably, two in these control arms 31,32,33,34 and 35 are designed as laterally controlling Arm processed, two in control arm 31,32,33,34 and 35 are designed as longitudinal control arm, control arm 31, in 32,33,34 and 35 is designed as track rod or controls pull bar.

In addition to being attached by control arm 31,32,33,34 and 35, according to Fig. 1 to 3 Wheel draft hitch 10 embodiment in, the form of being provided with is the drive shaft 36 of universal drive shaft.This drives Moving axis is shown schematically and drive hub bracket 20.In this embodiment, a kind of vehicle is related to Back axle, its wheel draft hitch 10 with drive-type and and then the wheel hub bracket 20 of drive-type.

According to the present invention, in the structure of the wheel draft hitch 10 of this embodiment, take following measure. After defining the position of wheel hub bracket 20, in simulations wheel 100 is fixed on wheel hub bracket On 20.Then, make wheel 100 move in all extreme regions and between extreme regions in Between move on section, depict two extreme positions of wheel 100 the most in fig. 2.If drawn All sections between these extreme positions, then define wheel space 110, and this is taken turns space and on the whole may be used The annulus (ring cyclide) with the inner space of closing can be similar to.Space 110 is taken turns at this Saddle type space in can find a following region: Shi Lun space, this region 110 all towards car (away from the vehicle body) region that directly spacing is maximum in the region in body 200 direction.Directly spacing can be regarded as: Beeline between respective regions and the vehicle body 200 in wheel space 110.The longest in this direct spacing In the case of on following direction, there is max architecture space: the most subsequently at this structure space The wheel suspension connector 42 of middle location vibration absorber 40.

In fig 1 and 2 it is clear that vibration absorber 40 can be made in this way to be positioned, This location in the best way be in close to wheel wheel space 110 near carry out.This can pass through root Realize according to the location in join domain 50 of the present invention.Vibration absorber 40 this especially close to car Wheel and and then the most externally-located location not only improve response characteristic and damping behavior, and realize Utilize the structure space of wheel draft hitch 10 ideally such that it is able to keep rut width also to protect simultaneously Hold vehicle to expand along the loading in the direction (i.e. along relative vehicle travel direction F horizontal) of width dimensions chain Broadening degree.

As shown in Fig. 1 to 3, in the embodiment of wheel draft hitch 10, except vibration damping fills Put and outside 40, be also provided with single spring assembly 60.This spring assembly also in inside towards vehicle body 200 The direction peviform that is arranged on control arm 31 receptacle 31a in.In same control arm 31 also Supporting vibration absorber 40, thus indirectly by this control arm 31 at vibration absorber 40 and wheel hub bracket Wheel hub cradle coupler 42 is provided between 20.

As can be seen by Fig. 3 equally, by making spring assembly 60 and vibration absorber 40 each other The reduction whole population structure height of taking turns draft hitch 10 has been implemented separately.Structure space is so made to subtract Little, and without standing the adverse effect of width dimensions chain to wheel draft hitch 10, because of according to this Bright by having obtained for single spring assembly 60 positioning vibration absorber 40 by the way of wheel Free space.

It is also carried out the setting to vibration absorber 40 according to the present invention or tilts to set, i.e. towards vehicle body 200 Direction, i.e. about axletree RA (inclination).When people observe vibration damping axis A, according to this Invention can be advantageously carried out backward, is i.e. in reverse to the setting of travel direction F.

The section 32a of bending can also be seen in control arm 32 in Fig. 2 and Fig. 1.This section is outside Bending, i.e. deviates from join domain 50, vibration absorber 40 and the bending of spring assembly 60 ground, thus it obtains To or expand the structure space for these single components.

The preceding description of embodiment is only described the present invention in the framework of example.Certainly, this is real Execute each feature of scheme, can combine freely with each other, without departing from this as long as the most meaningful Bright framework.

Reference numerals list

10 take turns draft hitch

20 wheel hub brackets

31 control arms

The receptacle of 31a peviform

32 control arms

The section of 32a bending

33 control arms

34 control arms

35 control arms

36 drive shafts

40 vibration absorbers

42 wheel hub cradle coupler

50 join domains

60 spring assemblies

100 wheels

110 take turns space

200 vehicle bodies

A vibration damping axis

The travel direction of F vehicle

RA axletree

Claims (10)

1. the wheel draft hitch (10) of the back axle being used for vehicle, has:

Wheel hub bracket (20) that can turn in wobble area, for fixing vehicle wheel (100)；

For make wheel hub bracket (20) be hinged on the vehicle body (200) of vehicle multiple control arms (31, 32、33、34、35)；

For the vibration absorber that wheel hub bracket (20) is decayed relative to the motion of vehicle body (200) (40),

Wherein, vibration absorber (40) is by wheel hub cradle coupler (42) and wheel hub bracket (20) Connect,

It is characterized in that,

Wheel hub cradle coupler (42) is arranged in the car limited by the wobble area of wheel hub bracket (20) In the following join domain (50) of the surface segment of wheel (100) wheel space (110): this connection Faced by Shi Lun space, region (110), all regions middle-range vehicle body (200) of vehicle body (200) is straight Connect the region that spacing is maximum,

Wherein, the wobble area of wheel hub bracket (20) wheel (100) wheel space (110) limited About a symmetrical plane symmetry, the wheel hub cradle coupler (42) of vibration absorber (40) is arranged in this In symmetrical plane,

With vibration absorber (40) dividually, with reference to wheel hub bracket (20) at vibration absorber (40) Being disposed with spring assembly (60) on opposite side, described spring assembly is for wheel hub bracket (20) phase Motion for vehicle body (200) provides resilient support.

The most according to claim 1 take turns draft hitch (10), it is characterised in that described many A control arm (31) in individual control arm has the receptacle (31a) of peviform, in described peviform Receptacle supports described spring assembly (60).

The most according to claim 1 take turns draft hitch (10), it is characterised in that vibration damping fills Put (40) to be supported in identical control arm (31) or this identical control with spring assembly (60) On arm processed (31).

4., according to the wheel draft hitch (10) according to any one of claim 1-3, its feature exists In, at least one control arm (32) in the plurality of control arm has the section (32a) of bending, The section of described bending is that vibration absorber (40) provides structure space and/or fills for vibration damping by bending section Put big structure space.

5., according to the wheel draft hitch (10) according to any one of claim 1-3, its feature exists In, wheel hub cradle coupler (42) is arranged as: at wheel (100) relative to vehicle body (200) In relative motion the stroke of the stroke of wheel hub bracket (20) and the vibration absorber (40) simultaneously produced it Between ratio more than 0.5:1.

6., according to the wheel draft hitch (10) according to any one of claim 1-3, its feature exists In, it is provided with the drive shaft (36) for drive hub bracket (20).

7., according to the wheel draft hitch (10) according to any one of claim 1-3, its feature exists In, vibration absorber (40) makes it possible to implement vibration damping, wherein vibration damping axis along vibration damping axis (A) (A) by the vertical curve of vehicle relative to the travel direction (F) of vehicle backward and/or towards vehicle body (200) Tilt.

8., according to the wheel draft hitch (10) according to any one of claim 1-3, its feature exists In, the wheel hub bracket (20) that can turn to is for about swinging the design of axisymmetric wobble area.

9. a back axle for vehicle, the wheel of wheel draft hitch and right side that described back axle has left side hangs Rack device, the two wheel draft hitch (10) is designed as to be had according to arbitrary in claim 1 to 8 Feature described in Xiang.

10. one kind for positioning the wheel hub cradle coupler (42) of vibration absorber (40) Method, described wheel hub cradle coupler is used for the wheel draft hitch (10) with fixing vehicle wheel (100) Wheel hub bracket (20) connects, and this wheel hub bracket can turn in a wobble area, and described method has Following steps:

-determine the wheel (100) wheel space (110) limited by the wobble area of wheel hub bracket (20)；

-determine the following join domain (50) of surface segment of wheel space (110): this join domain Be wheel space (110) in the face of vehicle body (200) all regions middle-range vehicle body (200) direct between Away from maximum region, and

-wheel hub cradle coupler (42) is positioned in join domain (50),

Wherein, described method is for having the wheel according to feature according to any one of claim 1 to 8 Draft hitch (10).