CN104050303A - Automobile torsion bar beam rear axle hard point design method - Google Patents
Automobile torsion bar beam rear axle hard point design method Download PDFInfo
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- CN104050303A CN104050303A CN201310077977.9A CN201310077977A CN104050303A CN 104050303 A CN104050303 A CN 104050303A CN 201310077977 A CN201310077977 A CN 201310077977A CN 104050303 A CN104050303 A CN 104050303A
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- axle
- torsion bar
- rear axle
- bar beam
- core wheel
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Abstract
The invention relates to an automobile torsion bar beam rear axle hard point design method, which comprises the following steps that automobile torsion bar beam rear axle hard points are determined, wherein the hard points comprise a left rear axle back wheel core A and a right rear axle rear wheel core A1 in symmetrical distribution along the longitudinal center line of a rear axle cross beam, a left rear axle bushing center O1 and a right rear axle bushing center O2 in symmetrical distribution along the longitudinal center line of the rear axle cross beam, and a rear axle cross beam shearing center Os positioned on the longitudinal center line positioned on the rear axle cross beam; parameters c, a and b are determined according to a relational expression shown as the accompanying drawing, and the arrangement positions of the hard points in a horizontal protection plane can be determined according to the parameters a, b and c and a value t. When the method provided by the invention is adopted, the design efficiency of a torsion bar beam rear axle can be obviously improved, the development period is shortened, and the development cost is reduced.
Description
Technical field
The present invention relates to a kind of structure design of automobile method, relate in particular to a kind of automobile torsion bar beam back axle hard spot method for designing.
Background technology
The major function of automobile torsion bar beam back axle is: the load on support vehicle and transmission road surface, and form the rear-suspension system of vehicle with rear spring together with vibration damper, therefore automobile torsion bar beam back axle plays a key effect for manipulation stability and the riding comfort of vehicle, and it is widely used in A level car and A level vehicle on the upper side at present.
Existing automobile torsion bar beam back axle development scheme is mainly with reference to external vehicle, then considers that the difference of rigging position is changed.Slip-stick artist carries out primary design with reference to competition vehicle, then 3D model is put in ADAMS software and carries out dynamics assessment, and so constantly circulation, until meet the demands.But, owing to there is no certain rule in this process, slip-stick artist designs by rule of thumb, its degree of freedom is very large, therefore while optimizing a kind of project organization scheme in needs are comformed multi-scheme, will expend considerable time, thereby waste human and material resources resource, had influence on development efficiency and development progress.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of automobile torsion bar beam back axle hard spot method for designing, thereby successfully solved the above-mentioned problems in the prior art and otherwise problem.
In order to realize foregoing invention object, the technical solution used in the present invention is as follows:
A kind of automobile torsion bar beam back axle hard spot method for designing, described automobile torsion bar beam back axle hard spot method for designing comprises step:
A. determine that automobile torsion bar beam back axle hard spot comprises: along core wheel A1 after core wheel A after the symmetrical left back bridge of the longitudinal centre line of back axle crossbeam and right back bridge, along the symmetrical left rear-axle bushing center O 1 of the longitudinal centre line of back axle crossbeam and right rear-axle bushing center O 2, be positioned at the back axle crossbeam shear centre Os on the longitudinal centre line of back axle crossbeam;
B. determine parameter c value according to following relational expression:
Wherein:
The roll center that h represents torsion bar beam rear overhang height overhead, its value is inputted as constant;
C represents after left back bridge the vertical range between line and the back axle crossbeam shear centre Os of core wheel A1 after core wheel A and right back bridge;
Tslr represents the static dynamic radius of rear tyre, and its value is inputted as constant;
T represents rear tread, i.e. distance between core wheel A1 after core wheel A and right back bridge after left back bridge, and its value is inputted as constant;
with
represent respectively vehicle roll angle and intermediate beam torsion angle,
input in this as constant;
C. determine relation between parameter a, b according to following relational expression and the parameter c value that obtains:
Wherein:
A represents distance between left rear-axle bushing center O 1 and right rear-axle bushing center O 2;
B represents the vertical range between line and the back axle crossbeam shear centre Os of left rear-axle bushing center O 1 and right rear-axle bushing center O 2;
D. according to parameter a, b, c and t value, can determine core wheel A1 after core wheel A after left back bridge, right back bridge, left rear-axle bushing center O 1, right rear-axle bushing center O 2 and the back axle crossbeam shear centre Os position at horizontal plane.
In above-mentioned automobile torsion bar beam back axle hard spot method for designing, preferably, parameter h span is 120-150mm.
In above-mentioned automobile torsion bar beam back axle hard spot method for designing, preferably, parameter
span is 0.29-0.31.
Adopt automobile torsion bar beam back axle hard spot method for designing of the present invention, can effectively set up part torsion bar beam hard spot principle of design, determine automobile torsion bar beam back axle hard spot position and quantity, design personnel tentatively complete the layout design of automobile torsion bar beam back axle hard spot, to progressively optimize in Vehicle Dynamics Analysis subsequently, particularly follow-up only need to finely tune on this basis just can determine the 3D model that substantially meets dynamics requirement, thereby can significantly promote the design efficiency of twist beam rear axle, shorten the construction cycle and reduce development cost.
Brief description of the drawings
Below with reference to drawings and Examples, technical scheme of the present invention is described in further detail, but it should be known that accompanying drawing is only for task of explanation designs, therefore not as the restriction of the scope of the invention.In addition, unless otherwise indicated, accompanying drawing is be only intended to conceptually to represent the composition of institute's description object or structure and may have carried out expansiveness demonstration, and accompanying drawing also needn't be drawn according to ratio.
Fig. 1 is the schematic diagram that automobile torsion bar beam back axle hard spot method for designing according to the present invention is determined automobile torsion bar beam back axle hard spot.
Fig. 2 is the schematic top plan view of an automobile torsion bar beam back axle.
Fig. 3 is the schematic rear view of an automobile torsion bar beam back axle.
Fig. 4 and Fig. 5 are the geometric relationship schematic diagram that automobile torsion bar beam back axle hard spot method for designing according to the present invention is determined automobile torsion bar beam back axle hard spot.
Fig. 6 is the funtcional relationship schematic diagram between height of roll center h and the twist beam rear axle structural parameters of the torsion bar beam rear overhang that obtains of automobile torsion bar beam back axle hard spot method for designing according to the present invention.
Fig. 7 is the funtcional relationship schematic diagram between the vertical range b between distance a, left rear-axle bushing center O 1 and line and the back axle crossbeam shear centre Os of right rear-axle bushing center O 2 between the left rear-axle bushing center O 1 that obtains of automobile torsion bar beam back axle hard spot method for designing according to the present invention and right rear-axle bushing center O 2.
Embodiment
First, it should be noted that, to illustrate by way of example treatment step, feature and the advantage of automobile torsion bar beam back axle hard spot method for designing of the present invention below, but all descriptions are only used for describing, and they should be interpreted as the present invention is formed to any restriction.In addition, in mentioned herein each embodiment, described or implicit any single technical characterictic, or be shown or lie in any single technical characterictic in each accompanying drawing, still can between these technical characterictics (or its equivalent), proceed combination in any or delete, thereby obtain of the present invention more other embodiment that may directly not mention in this article.
Unless beyond specializing, upper and lower, the front, rear, left and right mentioned in this article, the orientation term such as longitudinal describe with respect to content shown in each accompanying drawing, they are relative concepts, therefore likely can produce corresponding variation according to its diverse location of living in, different use state.So, also these or other orientation term should be interpreted as to restricted term.
Fig. 1 is the schematic diagram that automobile torsion bar beam back axle hard spot method for designing according to the present invention is determined automobile torsion bar beam back axle hard spot, will first by this figure, the inventive method be elaborated below.
In the methods of the invention, first determine automobile torsion bar beam back axle hard spot.Because automobile torsion bar beam back axle structurally mainly comprises lining pipe, suspension link and crossbeam, therefore, as shown in Figure 1, the inventive method determines that automobile torsion bar beam back axle hard spot comprises the shear centre point of two core wheel points, two rear-axle bushing central points, a crossbeam, and these hard spots are:
Core wheel A1 after core wheel A and right back bridge after left back bridge, they are symmetrical along the longitudinal centre line of back axle crossbeam, and the distance between the two has determined rear tread t, and this is given by arrangement;
Left rear-axle bushing center O 1 and right rear-axle bushing center O 2, they are symmetrical along the longitudinal centre line of back axle crossbeam, distance between the two has determined the width a of vehicle body floor side member, and together with the position of their position and core wheel A after left back bridge and core wheel A1 after right back bridge, determine the length (, the length sum of b shown in Fig. 1 and c) of back axle suspension link;
Back axle crossbeam shear centre Os, it is positioned on the longitudinal centre line of back axle crossbeam, its location positioning position b and the c of back axle crossbeam between rear-axle bushing and rear core wheel, wherein b represents the vertical range between line and the back axle crossbeam shear centre Os of left rear-axle bushing center O 1 and right rear-axle bushing center O 2, and c represents after left back bridge the vertical range between line and the back axle crossbeam shear centre Os of core wheel A1 after core wheel A and right back bridge.
Derive for the ease of understanding design philosophy of the present invention and follow-up relational expression, below in conjunction with Fig. 2 and Fig. 3, the contents such as rear overhang roll center are described.
Definition according to automobile theory about twist beam rear axle roll center, in twist beam rear axle schematic top plan view illustrated in fig. 2, numeral 1 and 2 represents respectively longitudinal plane of symmetry of vehicle complete vehicle, the cross central line of trailing wheel, left rear-axle bushing center O 1 and bridge crossbeam shear centre Os are connected and extend to its with trailing wheel core wheel line carry out crossing, G to the extreme.Then, in twist beam rear axle schematic rear view illustrated in fig. 3, the wheel tyre earth point W of limit G and offside is carried out to line, the intersection point Or of this line and the car load plane of symmetry is the roll center of torsion bar beam rear overhang.The roll center Or of torsion bar beam rear overhang is that the roll center of torsion bar beam rear overhang is apart from floor level h to the distance on ground.
According to the achievement in research of GM Pontiac slip-stick artist-Terry L. Satchell, there is following relational expression in twist beam rear axle structural parameters:
(1)
In above-mentioned relation formula (1), rear tread t inputs as constant; Parameter
with
represent respectively vehicle roll angle and intermediate beam torsion angle,
(only as an example, can be by the time adopting the inventive method to design in this as constant input
span is made as 0.29-0.31).
In order further clearly to express the geometric relationship between automobile torsion bar beam rear axle structure parameter, continue below to carry out the relational expression explanation of deriving in conjunction with Fig. 4 and the shown each key point of Fig. 5 and the line between them.
The definition of the comprehensive above roll center about torsion bar beam rear overhang, can derive and determine following automobile torsion bar beam back axle hard spot arrangement relation formula:
(2)
(3)
Can obtain following relational expression (4) by relational expression (3):
(4)
(5)
(6)
(7)
In above-mentioned relation formula (2)-(7) and other relational expressions herein, parameter Tslr represents the static dynamic radius of rear tyre, and it is inputted as constant; Parameter OrK represents the roll center Or of torsion bar beam rear overhang and puts K (as shown in Figure 5, point K be the straight line vertical point on the two line of core wheel A1 after limit G and right back bridge through the roll center Or of torsion bar beam rear overhang) between distance, parameter GA1 represents after limit G and right back bridge distance between core wheel A1, parameter GK represents distance between limit G and some K, and parameter K A1 represents after a K and right back bridge distance between core wheel A1.
Then, can be derived by above relational expression (5), (6) and (7):
(8)
Can be derived by relational expression (1):
(9)
By relational expression (7) and (8) substitution relational expression (6), can obtain:
(10)
By relational expression (10) substitution relational expression (2), can obtain:
(11)
By relational expression (10) substitution relational expression (11), can obtain:
(12)
So far the roll center that, just can set up torsion bar beam rear overhang according to relational expression (12) is apart from the funtcional relationship between floor level h and twist beam rear axle structural parameters:
(13)
In Fig. 6, schematically express above-mentioned funtcional relationship with graphics mode, from this figure, the two is linear apart from the vertical range c between line and the back axle crossbeam shear centre Os of core wheel A1 after core wheel A after floor level h, left back bridge and right back bridge for the roll center of torsion bar beam rear overhang.In the methods of the invention, the span of above-mentioned parameter h, c is respectively 0-Tslr and 0-
.In the time of design, above-mentioned parameter h inputs as constant, and parameter Tslr also inputs as constant.Only as an example, for example, the span of this parameter h can be set in to 120-150mm, now the value of parameter c is located within the scope of C1-C2 as illustrated in fig. 6.
Further, according to relational expression (9), vertical range c after right back bridge between the line of core wheel A1 and back axle crossbeam shear centre Os is determined, the vertical range b between left rear-axle bushing center O 1 and right rear-axle bushing center O 2 between the line of distance a, left rear-axle bushing center O 1 and right rear-axle bushing center O 2 and back axle crossbeam shear centre Os the two linear (referring to following relational expression (14)).Schematically show out as Fig. 7, it be one by the straight line of coordinate round dot, its slope is
.
(14)
Converting relational expression (14) to function representation is:
(15)
Conventionally, between left rear-axle bushing center O 1 and right rear-axle bushing center O 2, distance a can determine according to the size of vehicle body crossbeam, and generally speaking it is to be the bigger the better.So, according to the vertical range b between the line of the left rear-axle bushing center O 1 of Fig. 7 and right rear-axle bushing center O 2 and back axle crossbeam shear centre Os.Vice versa, as shown in Figure 7, in the time having determined parameter a1 (or parameter b 1), just can correspondingly determine parameter b 1 (or parameter a1) by the shown linear relationship keeping between above-mentioned a and b that obtains of Fig. 7.
Comprehensive above explanation, according to above-mentioned parameter a, b, c and the t value determined, just can determine very effectively and quickly core wheel A1 after core wheel A after left back bridge, right back bridge, left rear-axle bushing center O 1, right rear-axle bushing center O 2 and these twist beam rear axle hard spots of back axle crossbeam shear centre Os position at horizontal plane, so not only for follow-up Vehicle Dynamics Analysis optimization provides convenient, and effectively promote development efficiency, shorten the design cycle of twist beam rear axle, and reduced development cost.
Below only illustrate in detail automobile torsion bar beam back axle hard spot method for designing of the present invention with way of example, these a few examples are only for explanation principle of the present invention and embodiment thereof, but not limitation of the present invention, without departing from the spirit and scope of the present invention, those skilled in the art can also make various distortion and improvement.Therefore, all technical schemes that are equal to all should belong to category of the present invention also by every claim of the present invention is limited.
Claims (3)
1. an automobile torsion bar beam back axle hard spot method for designing, is characterized in that, described automobile torsion bar beam back axle hard spot method for designing comprises step:
A. determine that automobile torsion bar beam back axle hard spot comprises: along core wheel A1 after core wheel A after the symmetrical left back bridge of the longitudinal centre line of back axle crossbeam and right back bridge, along the symmetrical left rear-axle bushing center O 1 of the longitudinal centre line of back axle crossbeam and right rear-axle bushing center O 2, be positioned at the back axle crossbeam shear centre Os on the longitudinal centre line of back axle crossbeam;
B. determine parameter c value according to following relational expression:
Wherein:
The roll center that h represents torsion bar beam rear overhang height overhead, its value is inputted as constant;
C represents after left back bridge the vertical range between line and the back axle crossbeam shear centre Os of core wheel A1 after core wheel A and right back bridge;
Tslr represents the static dynamic radius of rear tyre, and its value is inputted as constant;
T represents rear tread, i.e. distance between core wheel A1 after core wheel A and right back bridge after left back bridge, and its value is inputted as constant;
with
represent respectively vehicle roll angle and intermediate beam torsion angle,
input in this as constant;
C. determine relation between parameter a, b according to following relational expression and the parameter c value that obtains:
Wherein:
A represents distance between left rear-axle bushing center O 1 and right rear-axle bushing center O 2;
B represents the vertical range between line and the back axle crossbeam shear centre Os of left rear-axle bushing center O 1 and right rear-axle bushing center O 2;
D. according to parameter a, b, c and t value, can determine core wheel A1 after core wheel A after left back bridge, right back bridge, left rear-axle bushing center O 1, right rear-axle bushing center O 2 and the back axle crossbeam shear centre Os position at horizontal plane.
2. automobile torsion bar beam back axle hard spot method for designing according to claim 1, is characterized in that, parameter h span is 120-150mm.
3. automobile torsion bar beam back axle hard spot method for designing according to claim 1 and 2, is characterized in that parameter
span is 0.29-0.31.
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| CN201310077977.9A CN104050303B (en) | 2013-03-12 | 2013-03-12 | Automobile torsion bar beam back axle hard spot design method |
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|---|---|---|---|
| CN201310077977.9A CN104050303B (en) | 2013-03-12 | 2013-03-12 | Automobile torsion bar beam back axle hard spot design method |
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2013
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| US20040046335A1 (en) * | 2000-03-27 | 2004-03-11 | Knox Lawrence D. | Surface vehicle vertical trajectory planning |
| CN101474951A (en) * | 2009-01-22 | 2009-07-08 | 清华大学 | Multi-linkage rod rear-independent suspension fork for keeping wheel alignment parameter constant |
| CN102116613A (en) * | 2009-12-31 | 2011-07-06 | 上海汽车集团股份有限公司 | Connecting shaft for connecting universal joint and design method thereof as well as chassis and vehicle using shaft |
| CN101826125A (en) * | 2010-03-25 | 2010-09-08 | 奇瑞汽车股份有限公司 | Method for designing McPherson suspension |
| CN102222144A (en) * | 2011-06-26 | 2011-10-19 | 北京理工大学 | Optimization method of arrangement of chassis drive shaft of minibus |
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