CN103358817A - Vehicle rear axle arrangement applicable to pavements - Google Patents
Vehicle rear axle arrangement applicable to pavements Download PDFInfo
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- CN103358817A CN103358817A CN2012100869770A CN201210086977A CN103358817A CN 103358817 A CN103358817 A CN 103358817A CN 2012100869770 A CN2012100869770 A CN 2012100869770A CN 201210086977 A CN201210086977 A CN 201210086977A CN 103358817 A CN103358817 A CN 103358817A
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Abstract
The invention discloses vehicle rear axle arrangement applicable to pavements. The vehicle rear axle arrangement is characterized in that the centers of vehicle rear axles are arranged at the rear end of a vehicle longitudinal shaft, an angle beta is formed between the axis of each arranged vehicle rear axle and the perpendicular direction of the axis of the vehicle longitudinal shaft, and the angles beta are consistent to axial steering angles of the vehicle rear axles and are opposite to the axial steering angles. The vehicle rear axle arrangement has the advantages that degradation of the control stability of a vehicle due to axial steering of the rear axles of the vehicle when the vehicle linearly runs on a pavement with a reversed arch is effectively prevented, the sideslip quantity of the vehicle assuredly meets national standards, and the control stability of the vehicle is improved.
Description
Technical field
The vehicle rear axle that the present invention relates to a kind of suitable road surface is arranged.
Background technology
General vehicle is in order to guarantee straight-line travelling, self-aligning, turn to partial wear light and the minimizing tire that the front-wheel of vehicle has all adopted positioning means.Be the multiple parameters settings such as kingpin caster angle, Kingpin inclination angle, camber angle and toeing-in of vehicle propons.But for vehicle rear wheel, its back axle axis just arranges with the vehicle longitudinal axis is vertical simply, and does not have other more constraints.
Clear in standard GB/T 7258-2004 " self-propelled vehicle safe and technical specification ": the horizontal sideslip amount of motor turning wheel, when adopting slip indicator to detect, the sideslip amount should be not more than 5m/km.
Usually because highway is camber at transversal surface, namely all there is the low situation in middle high both sides in general highway, and no matter vehicle keeps left or keep to the right, and all has the situation of left and right wheels load inequality.So very small sideslip amount on the slip indicator, even slip indicator is zero, and on the highway of standard, the sideslip amount of car load is but much larger than the sideslip amount of standard, even affects the road-holding property of car load.Simultaneously when vehicle on highway during straight-line travelling because the existence of road surface camber, it is uneven to cause the left and right sides axle load to distribute, cause body roll, cause " axle steer " of vehicle rear axle, produce additional torque, cause car load sideslip amount to strengthen, affect the road-holding property of vehicle.As shown in Figure 1, during vehicle stationary state, the vehicle rear axle axis is vertical with vehicle longitudinal axis axis, and during vehicle rear axle " axle steer ", the back axle axis is take the vehicle longitudinal axis as axle center deflection, and becomes the β angle with back axle axis under the vehicle stationary state; 1 is the vehicle longitudinal axis among the figure, 2 vehicle rear axles when being stationary vehicle, 3 vehicle rear axles when being vehicle rear axle " axle steer ".
Summary of the invention
Technical matters to be solved by this invention provides a kind of vehicle rear axle of suitable road surface and arranges, this back axle is arranged and has effectively been avoided vehicle when the straight-line travelling of camber road surface, back axle produces the situation that axle steer causes the vehicle handling stability variation, the sideslip amount that has guaranteed vehicle meets national standard, has improved the road-holding property of vehicle.
For solving the problems of the technologies described above, the vehicle rear axle layout that the present invention is fit to the road surface comprises the vehicle longitudinal axis and vehicle rear axle, described vehicle longitudinal axis rear end is located at described vehicle rear axle center, described vehicle rear axle axis becomes the β angle to arrange with the vertical direction of described vehicle longitudinal axis axis, described β angle is consistent with vehicle rear axle axle steer angle and arrange in opposite directions with the axle steer angle.
Further, the computing formula of above-mentioned β angle is: β=θ * d β/d θ
In the formula: the side tilt angle that θ produces for vehicle body when vehicle is subjected to side force, d β/d θ is roll steer coefficient.
Further, the computing formula of the side tilt angle θ of above-mentioned vehicle body is: θ=λ+α
In the formula: α is the road surface transverse grade, and λ is compartment and ground angle,
The computing formula of λ is: λ=arctg (B-A)/C wherein: Α is that the left height of wagon in vehicle rear axle axis place, Β are that the right height of wagon in vehicle rear axle axis place, C are box width.
Because being fit to the vehicle rear axle layout on road surface, the present invention adopted technique scheme, be that vehicle longitudinal axis rear end is located at the vehicle rear axle center, the vehicle rear axle axis becomes the β angle to arrange with the vertical direction of vehicle longitudinal axis axis, this β angle is consistent with vehicle rear axle axle steer angle and arrange in opposite directions with the axle steer angle.This back axle arranges and has effectively avoided vehicle when the straight-line travelling of camber road surface that back axle produces the situation that axle steer causes the vehicle handling stability variation, has guaranteed that the sideslip amount of vehicle meets national standard, has improved the road-holding property of vehicle.
Description of drawings
The present invention is described in further detail below in conjunction with drawings and embodiments:
Fig. 1 is the scheme drawing that the conventional truck back axle is arranged;
Fig. 2 is the scheme drawing that the present invention is fit to the vehicle rear axle layout on road surface;
Fig. 3 is the scheme drawing of vehicle roll;
Fig. 4 is that vehicle rear axle is arranged β angle actual measurement scheme drawing.
The specific embodiment
As shown in Figure 2, the vehicle rear axle layout that the present invention is fit to the road surface comprises the vehicle longitudinal axis 1 and vehicle rear axle 4, the described vehicle longitudinal axis 1 rear end is located at described vehicle rear axle 4 centers, described vehicle rear axle 4 axis become the β angle to arrange with the vertical direction of the described vehicle longitudinal axis 1 axis, described β angle is consistent with vehicle rear axle 4 axle steer angles and arrange in opposite directions with the axle steer angle.
As shown in Figure 3, further, the computing formula of above-mentioned β angle is: β=θ * d β/d θ
In the formula: the side tilt angle that θ produces for vehicle body when vehicle is subjected to side force, d β/d θ is roll steer coefficient.
Further, the computing formula of the side tilt angle θ of above-mentioned vehicle body is: θ=λ+α
In the formula: α is the road surface transverse grade, and λ is compartment and ground angle,
The computing formula of λ is: λ=arctg (B-A)/C wherein: Α is that the left height of wagon in vehicle rear axle axis place, Β are that the right height of wagon in vehicle rear axle axis place, C are box width.The numerical value of A, B, C all can obtain by actual measurement.
Principle according to the vehicle theory turns to about vehicle roll when vehicle is subjected to the side force vehicle body to produce inclination, can produce the additional deflection angle around vertical axis (the vehicle longitudinal axis) at back axle, and this roll steer is also referred to as axle steer.Consistent and the layout in opposite directions of axle steer when the setting of β angle was with vehicle roll during therefore this vehicle rear axle was arranged.In the calculating of β angle, roll steer coefficient can be according to " roll steer and inclination flare steer coefficient calculate and the analyze " acquisition of tabling look-up in (auto technology supplementary issue in February, 2008), at first checked in the lateral acceleration of vehicle by side tilt angle, then find corresponding roll steer coefficient by corresponding lateral acceleration.
As shown in Figure 4, the setting of β angle also can obtain by actual measurement during this vehicle rear axle was arranged, on certain horizontal wall inscription road surface, vehicle is stopped, and this moment, vehicle rear axle produced the additional deflection angle around vertical axis 5, with plumb bob vertical projection was distinguished in ground E, F point in trailing wheel center, the left and right sides, back axle center projection is in ground in the G point, connect the EF point, cross C point work perpendicular to the vertical curve 6 of vertical axis 5, this vertical curve 6 is the β angle with the angle that the EF line forms.There is certain error in this actual measurement mode, difference a, the track rear b that also can measure with the laser four-wheel position finder distance about trailing wheel with good conditionsi, then β=arctga/b.
This vehicle rear axle is arranged the trend by analysis conventional vehicle rear axle " axle steer ", adjust the suspension parameter of back axle, angle of vehicle rear axle axis and vehicle longitudinal axis axis tilt is arranged, " axle steer " when this deflection angle and normal vehicle operation offsets, thereby the normal straight that has guaranteed vehicle is travelled, vehicle rear axle axis conter clockwise deflection when being stationary vehicle, vehicle rear axle produces " axle steer " when Vehicle Driving Cycle, conter clockwise deflection when being somebody's turn to do " axle steer " with stationary vehicle offsets, so that the vehicle rear axle axis keeps vertical with vehicle longitudinal axis axis, thereby improved the road-holding property of vehicle, reduced the sideslip amount.Certainly, because it is a lot of to affect the factor that vehicle rear axle turns to, such as the load transfer of vehicle centroid position, tire cornering stiffness, front and back wheel camber angle, antero posterior axis left and right wheels, camber steer effect etc.Therefore for concrete vehicle, the deflection angle β of vehicle rear axle axis should determine by final after corresponding calculating and the experiment.Namely record the relative vehicle longitudinal axis of vehicle rear axle axis axis sideslip angle β in the direction of the clock by calculating and testing first, then, when the mounting vehicle back axle, by adjusting suspension parameter, make vehicle rear axle to anticlockwise direction pre-deflection β angle.So just guaranteed that the vehicle rear axle axis is vertical with vehicle longitudinal axis axis, thereby has avoided theoretic sideslip after vehicle rear axle " axle steer " occurs.
Be arranged on the rearmounted high speed motorcoach after experiment such as this vehicle rear axle, when vehicle rear axle axis conter clockwise deflection 1.5 is spent, elimination the impact of roll steer, car load breaks away and significantly improves, linear driving performance is guaranteed.
Claims (3)
1. the vehicle rear axle on a suitable road surface is arranged, comprise the vehicle longitudinal axis and vehicle rear axle, described vehicle longitudinal axis rear end is located at described vehicle rear axle center, it is characterized in that: described vehicle rear axle axis becomes the β angle to arrange with the vertical direction of described vehicle longitudinal axis axis, and described β angle is consistent with vehicle rear axle axle steer angle and arrange in opposite directions with the axle steer angle.
2. the vehicle rear axle on suitable road surface according to claim 1 is arranged, it is characterized in that: the computing formula of described β angle is: β=θ * d β/d θ
In the formula: the side tilt angle that θ produces for vehicle body when vehicle is subjected to side force, d β/d θ is roll steer coefficient.
3. the vehicle rear axle on suitable road surface according to claim 2 is arranged, it is characterized in that: the computing formula of the side tilt angle θ of described vehicle body is: θ=λ+α
In the formula: α is the road surface transverse grade, and λ is compartment and ground angle,
The computing formula of λ is: λ=arctg (B-A)/C wherein: Α is that the left height of wagon in vehicle rear axle axis place, Β are that the right height of wagon in vehicle rear axle axis place, C are box width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100869770A CN103358817A (en) | 2012-03-29 | 2012-03-29 | Vehicle rear axle arrangement applicable to pavements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100869770A CN103358817A (en) | 2012-03-29 | 2012-03-29 | Vehicle rear axle arrangement applicable to pavements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103358817A true CN103358817A (en) | 2013-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100869770A Pending CN103358817A (en) | 2012-03-29 | 2012-03-29 | Vehicle rear axle arrangement applicable to pavements |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4424297A1 (en) * | 1994-07-09 | 1996-01-11 | Udo Schatz | skateboard of roller board and pneumatic wheels |
| CN1206380A (en) * | 1996-10-17 | 1999-01-27 | 柿见富雄 | Suspension device with crank type axle |
| CN1235101A (en) * | 1998-04-22 | 1999-11-17 | 米什兰集团总公司 | Torsion axle |
| US6571178B1 (en) * | 1998-06-13 | 2003-05-27 | Daimlerchrysler Ab | Method for curve recognition and axle alignment in rail vehicles |
| US20040055809A1 (en) * | 2001-09-12 | 2004-03-25 | Gabriel Wetzel | Method and device for the identification of an inclined face |
| DE102009007357A1 (en) * | 2009-02-04 | 2010-08-12 | Bayerische Motoren Werke Aktiengesellschaft | Active chassis frame controlling method for use in two-axle two-lane motor vehicle, involves providing regulation with respect to transverse dynamic adjacent to servo control with respect to transverse dynamic of vehicle |
| DE102011109357A1 (en) * | 2011-08-03 | 2012-03-22 | Daimler Ag | Testing system i.e. roller test bench, for testing motor car in hall, has detection device provided to recognize existence of error functions of component of vehicle based on steering angle that is adjusted by actuator |
| CN202528769U (en) * | 2012-03-29 | 2012-11-14 | 上海宝钢工业技术服务有限公司 | Vehicular rear axle arrangement suitable for road surface |
-
2012
- 2012-03-29 CN CN2012100869770A patent/CN103358817A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4424297A1 (en) * | 1994-07-09 | 1996-01-11 | Udo Schatz | skateboard of roller board and pneumatic wheels |
| CN1206380A (en) * | 1996-10-17 | 1999-01-27 | 柿见富雄 | Suspension device with crank type axle |
| CN1235101A (en) * | 1998-04-22 | 1999-11-17 | 米什兰集团总公司 | Torsion axle |
| US6571178B1 (en) * | 1998-06-13 | 2003-05-27 | Daimlerchrysler Ab | Method for curve recognition and axle alignment in rail vehicles |
| US20040055809A1 (en) * | 2001-09-12 | 2004-03-25 | Gabriel Wetzel | Method and device for the identification of an inclined face |
| DE102009007357A1 (en) * | 2009-02-04 | 2010-08-12 | Bayerische Motoren Werke Aktiengesellschaft | Active chassis frame controlling method for use in two-axle two-lane motor vehicle, involves providing regulation with respect to transverse dynamic adjacent to servo control with respect to transverse dynamic of vehicle |
| DE102011109357A1 (en) * | 2011-08-03 | 2012-03-22 | Daimler Ag | Testing system i.e. roller test bench, for testing motor car in hall, has detection device provided to recognize existence of error functions of component of vehicle based on steering angle that is adjusted by actuator |
| CN202528769U (en) * | 2012-03-29 | 2012-11-14 | 上海宝钢工业技术服务有限公司 | Vehicular rear axle arrangement suitable for road surface |
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Application publication date: 20131023 |
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| WD01 | Invention patent application deemed withdrawn after publication |