CN108595779A - A kind of automobile door glass thrust center point determines method - Google Patents

Abstract

The invention discloses a kind of automobile door glass thrust center points to determine method, and this approach includes the following steps：1) movement of automobile door glass is divided into raising and lowering both direction, each direction is divided into three phases, respectively starting stage, constant velocity stage and arrival up/down stop stage；2) force analysis when carrying out force analysis to the constant velocity stage of automobile door glass, including rising and force analysis when decline；3) equilibrium equation of stress and torque on the glass front during raising and lowering and the different directions of side is listed according to force analysis, the different directions include both vertically and horizontally；4) modeling and simulating is carried out using matlab/simulink according to equilibrium equation, solves thrust variation curve and deflection torque change curve when thrust center point takes different value away from glass rear portion length x；5) Best Thrust central point is solved.The present invention provides theoretical foundation by the movement founding mathematical models to lifter, for the design of glass-frame riser.

Description

A kind of automobile door glass thrust center point determines method

Technical field

The present invention relates to automotive light weight technology technologies more particularly to a kind of automobile door glass thrust center point to determine method.

Background technology

With the fast development of automobile industry, the popularity of car is higher and higher.Arrangements for automotive doors accounts in bodywork system There is critical role, and glass-frame riser is the important component of car door.Its major function is to realize the lifting of glass, convenient The use of driver and passenger have driving experience important influence.Since the glass-frame riser research and development starting in China is compared Evening, design method fall behind, and the stage for copying external glass-frame riser structure and shape are substantially at, so also many problems It needs to solve, wherein a very important aspect is exactly the determination of glass-frame riser thrust center point, if design does not conform to Reason, glass just will produce big deflection torque during exercise, so that it is generated interference with rubber guide groove, or even clamping stagnation occurs.Properly Thrust center point can effectively reduce resistance and deflection torque during glass run, reduce noise.

Invention content

The technical problem to be solved in the present invention is for the defects in the prior art, to provide in a kind of automobile door glass thrust Heart point determines method.

The technical solution adopted by the present invention to solve the technical problems is：A kind of automobile door glass thrust center point determination side Method includes the following steps：

1) movement of automobile door glass being divided into raising and lowering both direction, each direction is divided into three phases, point It Wei not starting stage, constant velocity stage and arrival up/down stop stage；

2) force analysis when carrying out force analysis to the constant velocity stage of automobile door glass, including rising and when decline Force analysis；

3) listed according to force analysis on the glass front during raising and lowering and the different directions of side stress and The equilibrium equation of torque, the different directions include both vertically and horizontally；

4) modeling and simulating is carried out using matlab or simulink according to equilibrium equation, solves thrust center point away from glass Thrust variation curve and deflection torque change curve when rear portion length x takes different value；

5) Best Thrust central point is solved

For the thrust center point position x of a certain determination, the minimum value of thrust when glass rises is gone out by model solution F_{Push away min}With maximum value F_{Push away max}, then solve and obtain thrust variation value Δ F_{Push away max}=F_{Push away max}-F_{Push away min}, during finding out glass motion Thrust variation coefficientDuring glass motion, deflection torque be counterclockwise (i.e. glass motion when be close to Guide groove afterwards) it is denoted as Dir >=0, deflection torque T is between T_minAnd T_maxBetween, i.e., it must meet：

Thrust center point x values are respectively forwardly primary every 2mm values backward from water incisal guide slot midpoint, find out respectively k and T when requiring Dir >=0, and meets T_min≤T≤T_maxWhen, thrust center point x values when thrust variation coefficient k minimum are institute The thrust center point position asked.When requiring Dir≤0, i.e., deflection torque is clockwise, to be acquired most preferably with same method Thrust center point.

By said program, model in the step 4) the specific steps are：

Determine that input parameter, the input parameter include：The geometric dimension of glass, the gravity of glass, radius of curvature；Pass through It is specifically calculated by power module, if Fig. 6 is front guide slot moment of resistance model；

Uniform load module is established using the above method, gravity torque module, support reaction module, seeks sliding block thrust block, The tool used is surrounded by Math, Sources, Sinks, User-Defined Functions and Subsystems；

The input and output of these modules are mutually butted, the model of the solution thrust center point of an entirety is collectively formed.

The beneficial effect comprise that：Patent of the present invention provides positive thinking for the design of glass-frame riser.I.e. By the way that automobile door glass theoretical modeling, the stress of front force analysis glass provides theoretical foundation for the design of glass-frame riser. Existing lifter analyzes utilized load data often experiment or experience gained, but since experimental condition is limited, Often there are prodigious safety coefficient and experimental error, this has resulted in the inaccuracy of analysis result.The present invention passes through to lifting The movement founding mathematical models of device obtain its theory load data, and demonstrate its correctness by specifically testing, can The preferably analysis of guide product.

Description of the drawings

Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：

Fig. 1 is the known parameter schematic diagram after automobile door glass simplifies；

Fig. 2 is glass ascent stage front stress and torque schematic diagram；

Fig. 3 is glass ascent stage lateral forces and torque schematic diagram；

Fig. 4 is glass decline stage front stress and torque schematic diagram；

Fig. 5 is glass decline stage lateral forces and torque schematic diagram；

Fig. 6 is front guide slot moment of resistance model；

Fig. 7 be rise when motor thrust with the glass motion time relation curve；

Fig. 8 be rise when deflection torque with the glass motion time relation curve；

Fig. 9 be decline when motor thrust with the glass motion time relation curve；

Figure 10 be decline when deflection torque with the glass motion time relation curve.

Specific implementation mode

In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention It is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to limit The fixed present invention.

A kind of automobile door glass thrust center point determines method, comprises the steps of：

(1) it according to the basic thought of force analysis, determines assumed condition, simplifies automobile door glass model；

The movement of automobile door glass is divided into raising and lowering both direction, and each direction is broadly divided into three phases, Respectively start, at the uniform velocity with reach upper (lower) stop, starting stage, motor exports big torque, and (including adds with initial resistance Fast resistance)；Constant velocity stage occupies the major part of movement, including glass enters water incisal guide slot；Stop phase enters up and down from glass Guide groove starts, and arrives motor rotation blockage.The present invention carries out analysis calculating just for constant velocity stage.

If Fig. 1 is the known parameter schematic diagram after automobile door glass simplifies, it is assumed that condition has：

Assuming that 1：The movement of glass and the rubber guide groove of car door fit like a glove, without excessive interference；

Assuming that 2：Glass normal pressure, which is uniformly distributed in, supports its sliding slot；

Assuming that 3：Disregard the contact resistance between sliding block and guide rail；

Assuming that 4：The pretightning force of rubber guide groove and friction coefficient are constant, i.e., do not consider the aging denaturation of rubber and the change of doorframe Shape.

(2) force analysis when automobile door glass moves

When glass motion, front enters slot length, rear portion enters slot length, water incisal guide slot length all becomes with glass motion height Change, therefore the resistance that glass is subject to also changes therewith.

The stress of a front surface and a side surface of glass in uphill process and the schematic diagram of torque are respectively such as Fig. 2 and Fig. 3.In figure Forward and backward guide groove support reaction has at an arbitrary position and only there are one direction, corresponding forward and backward guide groove props up anti-frictional force and torque There can only be one kind.Only analysis is made to uniform motion, so at this time the acceleration of glass be 0, torque and also be 0, construct put down Weigh equation.Front projection obtains the equilibrium equation of power in the vertical direction：

Wherein, F (t) indicates thrust suffered by glass；Δ Nt indicates that rubber guide groove acts on the uniform load size on glass； L_t1,L_t2,L_t3Indicate to indicate that front guide slot, rear guide groove, water incisal guide slot change with time length respectively；U indicates rubber guide groove friction Coefficient；θ indicates thrust and vertical direction angle；β indicates gravity direction and glass angle；A indicates distance of centre of gravity glass rear portion length； X indicates thrust center point away from glass rear portion length；B indicates thrust center point away from Glass base length；l₁,l₂,l₃Before indicating respectively Guide groove, rear guide groove, water incisal guide slot length；M indicates gravity point to glass centre of radius point；R indicates glass curvature half Diameter；T indicates motor thrust side projected size；Lt：Glass enters slot length summation.Meaning is identical in following formula.

Front projection takes square to obtain torque equilibrium equation thrust center point：

The force analysis of glass sides only considers pressure change of the thrust to glass and guide groove, and simplified model, makes to lead Slot is to the line of glass pressure direction stop above and below glass, and direction is along this line.Side projection is along horizontal The equilibrium equation of power can be obtained in direction：

Side projection takes square to the center of curvature, and the equilibrium equation of torque can be obtained：

Respectively such as Fig. 4 and Fig. 5, front is thrown for the stress of a front surface and a side surface of glass during decline and the schematic diagram of torque Vertically, the equilibrium equation of power can be obtained in shadow：

Front projection takes square to motor thrust point, and the equilibrium equation of torque can be obtained：

In the horizontal direction, the equilibrium equation of power can be obtained in side projection：

Side projection takes square to the center of curvature, and the equilibrium equation of torque can be obtained：

(2) simulink modeling and simulatings are utilized to solve

Formula (8) model solution in simulink is arrived based on above-mentioned formula (1).

Modeling the specific steps are：

1. determining input parameter, the input parameter includes：The geometric dimension of glass, the gravity of glass, radius of curvature； By specifically being calculated by power module in simulink, if Fig. 6 is front guide slot moment of resistance model；

2. same method establishes uniform load module, gravity torque module, support reaction module, seeks sliding block thrust block, use To tool be surrounded by Math, Sources, Sinks, User-Defined Functions and Subsystems etc.；

3. the input and output of these modules are mutually butted, the mould of the solution thrust center point of an entirety is collectively formed Type.

For the thrust center point position x of each determination, it is bent with the relationship of glass motion time that motor thrust can be found out Line and deflection torque with the glass motion time relation curve, as Fig. 7 and Fig. 8 be when rising motor thrust with the glass motion time Relation curve and deflection torque with the glass motion time relation curve, Fig. 9 and Figure 10 be when declining motor thrust with glass The relation curve of run duration and deflection torque with the glass motion time relation curve.

(3) Best Thrust central point is solved

For the thrust center point position x of a certain determination, the minimum value of thrust when glass rises is gone out by model solution F_{Push away min}With maximum value F_{Push away max}, can then solve to obtain thrust variation value Δ F_{Push away max}=F_{Push away max}-F_{Push away min}, find out glass motion process In thrust variation coefficientDuring glass motion, deflection torque be counterclockwise (i.e. glass motion when By guide groove backward) it is denoted as Dir >=0, deflection torque is between T_minAnd T_maxBetween.Must it meet：

Thrust center point x values are respectively forwardly primary every 2mm values backward from water incisal guide slot midpoint, find out respectively k and T.When requiring Dir >=0, and meet T_min≤T≤T_maxWhen, thrust center point x values when thrust variation coefficient k minimum are most Good thrust center point position.When requiring Dir≤0, best thrust center point can be acquired with same method.

It should be understood that for those of ordinary skills, it can be modified or changed according to the above description, And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.

Claims (2)

1. a kind of automobile door glass thrust center point determines method, which is characterized in that include the following steps：

1) movement of automobile door glass is divided into raising and lowering both direction, each direction is divided into three phases, respectively Starting stage, constant velocity stage and arrival up/down stop stage；

2) force analysis when carrying out force analysis to the constant velocity stage of automobile door glass, including rising and stress when decline Analysis；

3) stress and torque on the glass front during raising and lowering and the different directions of side are listed according to force analysis Equilibrium equation, the different directions include both vertically and horizontally；

4) modeling and simulating is carried out using matlab/simulink according to equilibrium equation, solves thrust center point away from glass rear portion Thrust variation curve and deflection torque change curve when length x takes different value；

5) Best Thrust central point is solved

For the thrust center point position x of a certain determination, the minimum value F of thrust when glass rises is gone out by model solution_{Push away min}With Maximum value F_{Push away max}, then solve and obtain thrust variation value Δ F_{Push away max}=F_{Push away max}-F_{Push away min}, find out the thrust change during glass motion Change coefficientDuring glass motion, deflection torque is counterclockwise to be denoted as Dir >=0, and deflection torque is inverse By guide groove backward when clockwise is glass motion, deflection torque T is between minimum value T_minAnd maximum of T_maxBetween, i.e., it must expire Foot：

Thrust center point x values are respectively forwardly primary every 2mm values backward from water incisal guide slot midpoint, find out thrust variation respectively Coefficient k and deflection torque T when requiring Dir >=0, and meet T_min≤T≤T_maxWhen, thrust when thrust variation coefficient k minimum The as required thrust center point position of central point x values；When requiring Dir≤0, i.e., deflection torque is clockwise, with same The method of sample acquires best thrust center point.

2. automobile door glass thrust center point according to claim 1 determines method, which is characterized in that built in the step 4) Mould the specific steps are：

Determine that input parameter, the input parameter include：The geometric dimension of glass, the gravity of glass, radius of curvature；By specific It is calculated by power module, if Fig. 6 is front guide slot moment of resistance model；

Uniform load module is established using the above method, gravity torque module, support reaction module, seeks sliding block thrust block, is used Tool be surrounded by Math, Sources, Sinks, User-Defined Functions and Subsystems；

The input and output of these modules are mutually butted, the model of the solution thrust center point of an entirety is collectively formed.