DE2343841C3 - Method for reducing or eliminating irregularities in motor vehicle tires - Google Patents

Description

3. The method according to claims 1 and 2, there are fluctuations.

characterized in that the calculation of the re- The object of the invention is therefore to provide a method

resulting force vectors from the harmonics to reduce or eliminate inequality First to wth order force vibrations on motor vehicle tires of the types mentioned at the beginning

he follows. Way of showing, in which the material removal more precisely,

4. The method according to any one of claims 1 to 3, d. H. due to the pure force fluctuations in rada characterized in that the separated dialer and lateral directions are carried out static components in both directions of rotation.

of the motor vehicle tire during one revolution 35 According to the invention, this object is thereby measured Lateral forces added and resolved according to size that from the measurement results the static components and direction are compared with each other and, the radial and lateral forces are separated, provided that the two forces result from the opposing fluctuations in the radial and lateral set directions of rotation do not act mutually - forces continuously the respective resulting force increase, is calculated on the motor vehicle tire according to the 40 vector according to size and direction and material is removed. the material removal on motor vehicle tires as a function takes place from the respective force vector

In the method according to the invention, a in the

earlier German patent specification 23 26 046 proposed

45 genetic procedure for quality testing of motor vehicles

The invention relates to a method for reducing tool tires are used in which, with the aid or elimination of irregularities assuming measurements of the forces in radial, tangen motor vehicle tires, with the rolling of the tialer and lateral direction also those in the loaded Forces arising from the vehicle tire, the standing surface of the tire, acting torques and force fluctuations in radial and lateral 50 are averaged.

Direction are measured and on the motor vehicle. It is advantageous that the force vector sums are formed from the instantaneous values of the tire depending on the measured radial radial force fluctuations and the lateral force fluctuations and the measured lateral forces material kungen the force vector sums and which is removed. There are also known methods (German 55 of the size and angle of the force vectors under Offenlegungsschrift 17 79 156) in which different loads can be applied,
In the case of a more in the direction of the so-called radial force fluctuations or more in the lateral direction on the rotating motor vehicle tire, the material removal on the motor vehicle repetitive grinding processes, which are usually shown in the 60 tires in this direction are twice as strong as the outer tread areas, the so-called tires in the other direction. In this way, one obtains a quick compensation of the misshapen in single shoulders, carried out in a fan-down manner. When using several grinding wheels.

these are carried out simultaneously according to the angular position. The calculation of the resulting force vectors

the radial force fluctuation maxima at the tire 65 can be derived from the harmonics of the force vibrations

introduced. first to nth order take place.

From the German Offenlegungsschrift 17 55 329 When compensating for the irregularities, the abist furthermore a method is known in which the separate static components of the two directions of rotation

³ '4

catching the motor vehicle tire during a ramming »» ^ ι * α iv · j · j- ι ·

ΪΖ. £ ^ _m p «,. N« n Tateral forces added iinH ™ Λ removal then takes place predominantly in radial on-

ic aaaien and after tierte direction. This is done in that

ider are compared, the two material removal devices with equal ₍ -

^ "Nr ^ hrirhtnnaen n.vhT" * ν ⁶ ^ Pp "- ^chet " feed to the tire.

Cancel any additional drive mechanism, 5 The increased feed or double feed

«" ■ · "« on the Kraitiahrzeugreiien according to material ... - . rv

^ TL! ^ SS. S- H- ^P v eC rl ^{nd material of a material removal device} against the

can be removed with the process steps Tire can be done with each, but preferably with each

"\? p ^ t ™ tit J vii ^kanntsl " ^d -. second rotation of the tire. Because of the reason

Before the invention shows a method for the quality of the different rubber covers, which by

improvement of motor vehicle tires in which the 10 deposits in the tire are created, no fixed

radial and the lateral force fluctuations free of standing function between the force fluctuations

the static components are taken into account and in the radial direction and in the lateral direction

If there is a correspondingly precise material removal, a continuous measurement is preferably carried out

can be done. In the invention, the force and review of the influence of the erosion are on

fluctuationsea and the moments that occur quickly 15 the quality of the tire

and purposefully to a permissible tolerance range. In the second type of implementation of the

reduaert. When carrying out the invention, _{grinding devices are} carried out after separate rens

the quality improvement either by only controlling measurement processes; d. that is, the first takes place

the force fluctuations are reduced or equal-radial and then the laterally oriented reduction

at the same time the additionally occurring moments with the irregularities or static forces of the

must be taken into account. Tire. In order to avoid mutual influence or

The figures serve to further explain the effect of the grinding process that has just been carried out

Invention. It shows _to determine, there is also a continuing measurement

Fig.l the force vectors of the lateral force fluctuation. For example, this is done in a radial direction

and the radial force fluctuation as well as the force fluctuation maximum occurring in the 25 direction

the resulting force vector of the force fluctuations, the effects on

tang, the lateral force fluctuations measured. Is that

F i g. 2 the static lateral forces which lead to the measurement result in the desired direction, d. H. he follows

averaging of the cone effect with different rotation and the reduction of the radial force fluctuations

directions can occur, and ₃₀ no or only little influence on the lateral

F i g. 3 a block diagram of a measuring direction, with force fluctuations, so the grinding can be done on this the place carried out the method according to the invention continue to take place until the radial force fluctuations can. errors lie within the tolerance range. Yields

In Fig. 1 is the vector of the lateral in the Jf direction, however, an increase in the lateral force fluctuation

force fluctuation LKS recorded and in F-directions, the removal takes place on the tire

the vector of the radial force fluctuation RKS. The surface at an offset point, that is, the position of the

from these two force fluctuation vectors resul- grinding wheel to the tire tread is changed,

with the vector of the radial- by adjusting the angle setting of the grinding wheel

force fluctuation an angle <x, which is changed by the increase in the tire tread. If the

mathematical relationship tan «= M £. given is ⁴ ° ^{reduction of the radial} force fluctuations up to

RKS ^b * · the tolerance range is carried out in

At the same time, this indicates whether the win- like balancing of the lateral force

kel λ mathematically in the first or fourth qua fluctuations.

dranten lies. In the case of the boundary conditions α = 90 °, FIG. 2 are those for the two measurement runs

carries RKS = 0, so that material removal is statically determined in different directions

can follow, the lateral forces P ₁ and P _2, oriented only in the lateral direction, plotted over time. P ₁

If η = 0, LKS = 0, where only in is the static lateral force in one direction of rotation

material removal oriented in the radial direction takes place. and P _{2 is} the static lateral force in the other rotational

The determination of the measured values takes place continuously, direction. The saved measured values are saved in

so that material removal means are always compared with one another in accordance with a comparison device, and

the instantaneous values are controlled. If so, a decision is made as to whether a compensation is carried out

an angle λ = 45 to 90 °, this means that the will.

radial force fluctuations RKS are smaller than the If, for example, P ₁ = -P ₂ , then the cone-lateral force fluctuations LKS. Then an ineffekt = 0. There is then no need for compensation through a lateral direction of unilaterally oriented material to be guided. When P ₁ 4 = P ₂ . must carry out a one-sided ablation on the tire. Correspondingly, removal over the entire circumference of the tire will take place depending on the determined angular value for certain shoulder areas. This removal oc the one material removal device with a brings about a shift in level of the static load stronger feed driven against the tire than the teralkraft zero line, wherein the in the F i g. 2 other, with the difference in the advance by as much as 60 interpreted distance α retained ble ^ k It is only larger, the more the angle <x goes towards 90 °. In a change in the amount of P ₁ una \ P ₂ , so that the preferred method is that the material setting of the sign, a change in the cone removal device by a factor of 2 is caused and recorded more strongly in the effects.
Tire is driven than the other, which means that good values can be achieved through constant measurement and checking. 65 rend of the removal process is the corresponding

If the range of the angle is between 0 and 45 °, the effect is continuously checked without a

so the radial force fluctuations RKS are greater than a new measurement in two directions of rotation is necessary

the lateral force fluctuations LKS. The material will. Furthermore, both values can be combined

the same supply, which then ends the removal process when z. B. P ₁ - -P ₂ or P ₁ = -kP ₂ with 0 < k <1, the factor k being specified as the limit value.

A device suitable for carrying out the method is shown as a block diagram in FIG. 3 shown. A two-component load cell 1 and measuring amplifier 3, 4 for each component, a downstream summer 7 and a subsequent separating device intended for the static components. The same applies to the measurement of the lateral forces a two-component load cell 2, two measuring amplifiers 5 and 6 for each component, one downstream Summing 8 and then a separating device 10 are provided for the static components.

The outputs of the separating device 9 and 10 are applied to a divider 11, where the tan κ is determined from the vectors of the lateral force fluctuation and the radial force fluctuation LKS and RKS . At the output of the divider 11 there is a memory 12. At the output of the memory 12, limit value preselectors 13, 14, 15 for various limit values tan a "tan" ₂ , tan "3 are provided. The outputs of this limit value preselector 13, 14, 15 are connected to a logic device 16. A servo control 17 of a removal device is connected to the outputs of the logic device 16.

In addition, a peak value rectifier 18 is connected to an output of the separating device 10, a memory 19 is located at the outputs. The memory 19 is in turn with the logging device 16 composite; n.

The function of the in F i g. 3 device shown is the following: The one from d: n Ziveikomponentenmjßdosen 1 and 2 ggjgjbsnsn, dan respective forces corresponding voltages are amplified in the measuring amplifiers 3, 4, 5, 6, then in the Summers 7, 8 totaled, and in the separating devices 9, 10 the static components,

ία z. B. the load in the radial direction and the so-called cone or angle effect components in the lateral direction, separated. The values for the vectors of the radial force fluctuations and the lateral force fluctuations which are at the outputs of the separating devices 9 and 10 are fed to the divider 11, where the corresponding tan * is determined. This value is stored in the memory 12 and also fed to the limit value preselectors 13, 14, 15. Depending on the preset limit value preselection for tan α , the servo control 17 for the removal device receives the command via the logic device 16 to remove material according to radial or lateral signals.
The peak comparator 18 provides the information as to whether the left or right tire shoulder has to be acted upon in the event of a lateral ablation. This takes place depending on the direction of the vector for the lateral force fluctuations LKS, which provides corresponding positive or negative voltage values which are supplied to the logic device 16 via the memory 19.

For this purpose 2 sheets of drawings

Claims (2)

Λ Pressure differences for each side of the tire claims: ^ to be measured and corresponding material quantities of each side of the tire depending on the 1. Procedures for reducing or eliminating differences in pressure are removed. Of this Irregularities in the series of motor vehicles, 5 through should also prevent differences in axial pressure to be avoided by rolling the loaded motor vehicle. In these known methods, there is no consideration of the lateral forces in the radial and lateral direction, which are measured and occur on the vehicle tire in loaded, rolling vehicle tires. Dependence on the measured radial forces io In the known methods, namely, only and the measured lateral forces are borrowed material borrowed the forces occurring in the radial direction, d ad urchgek en η ζ eic h- measure and accordingly the grinding processes are generated that from the measurement results the static controls. It has been shown, however, that lateral forces, proportions of the radial and lateral forces, can definitely be greater than radial forces and are separated from the fluctuations in FIG Forces can still be increased,
respective resulting force vector according to size A method and direction is calculated from US patent specification 37 39 533 and the materials for reducing or eliminating uneven wear on motor vehicle tires are dependent on motor vehicle tires as a function of the respective force vector 20 named species is known, but in the 2. The method according to claim 1, characterized thereby, measured force fluctuations in radial and lateral shows that with a more in the radial or direction still the static components of the radial and more force-lateral forces pointing in the lateral direction are included. Result from this vector the material removal on the vehicle - jhh inaccuracies in the material transfer, ripening in this direction is twice as strong 25 because the static components of the forces are normally involved as in the other direction. a multiple of the peak values of the pure power