VW Touareg repair
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- Wheels and tires
General information on wheels and tires
Specifications for re-equipment of disks and tires
Indexes of speed of tires
Marking on disks
Wear and hodimost of tires
Wear of high-speed tires
Service of tires
Evenly worn-out tires
Measurement of height of drawing of a protector
Diagonal non-uniform wear
Noise of a kacheniye of tires
Radial and lateral palpation of wheels and tires
Check of radial and lateral palpation of a disk with the tire by means of the indicator of hour type for tires V.A.G 1435
Lateral withdrawal of the car
Elimination of lateral withdrawal
Damages of tires
Design of the radial tire
Loss of pressure of air in tires
Damages of tires because of mistakes when mounting (assembly damages)
Marking боковины tires
Shift of wheels
Touareg since 2003 modeling years
Repair of the monitoring system of pressure of air in tires
Removal and installation of the control unit of the monitoring system of pressure in tires J502
Repair of system of regulation of a road clearance
Components of system of regulation of a road clearance and place of their installation
Removal and compressor installation without the block of electromagnetic valves
Air pipe repair
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Volkswagen Touareg / Touareg repair>> Running gear>> Wheels and tires>> Noise of a kacheniye of tires
General information on kacheniye noise
The noise of a kacheniye perceived by a human ear, are the fluctuations proceeding from a source of a sound and by air reaching ear.
Here the noise arising at the expense of certain features, and also effects are interesting at a kacheniye of tires (a noise source).
The reason of emergence of noise in the most part depends on a combination of tires and a paving.
The structure of a surface and material of a road cloth also strongly influence kacheniye noise. Noise level on the wet road, for example, much higher, than on the dry.
Profiling of drawing of a protector strongly influences noise level. Tires with cross-section flutes at an angle 90 ° more noisy, than tires with diagonal flutes.
Small blocks of a protector are unstable. Because of their strong deformation at a kacheniye of tires it is rent the air. Air fluctuations are created. which lead to noise.
Wider tires shumny. For water drainage they should have more flutes. At a kacheniye because of these flutes air at the expense of what also there are air fluctuations is forced out.
The other effects influencing a shumnost.
«Tire fluctuation» is the main reason for noise of a kacheniye. They arise because of excitement of air columns in protector flutes.
«The air pulsation» is a compression and air expansion at arrival of the area of contact of the tire on a road cloth at which it is deformed protector blocks.
Shumnost of tires
The Shumnost generally is defined by tires and a paving.
The qualities of a paving influencing a shumnost, is a roughness (roughness), structure and a material.
In parameters of influence of the tire, except other, the width of the tire and a disk are. Wider tire because of the bigger area of contact to a paving creates more noise as the bigger volume of air and big "weight" is squeezed out is raised in fluctuations, than at the smaller size.
Wider the disk also increases the area of contact of the tire. Thus, influence on a shumnost same, as well as at the wide tire. Besides wider disks negatively affect dempfiruyushchy properties of the tire.
Noise of a kacheniye of tires are audible in cars at which the engine is established in a forward part, it is better on back seats as aerodynamic noise and an engine sound in this place of salon disturb less.
Wear of a protector in the form of a path of a sawtooth form
Wear of a protector in the form of a path of a sawtooth form is a step wear of separate blocks of a protector that can lead to the raised shumnost. Wear of a sawtooth form occurs because of non-uniform deformation of blocks of a protector on a surface of contact of the tire to a paving. Such type of wear is more often shown on not driving wheels, than on leaders.
New tires are more inclined to wear of a protector of a sawtooth form as high blocks of a protector are more elastic. With reduction of depth of drawing of a protector rigidity of blocks of a protector raises, tendency to such type of wear decreases.
A–Blocks of a protector of the new tire; protector blocks if to look in the kacheniye direction the arrow 1, are identical on height in front and behind.
B–Wear of a protector in the form of a path of a sawtooth form; protector blocks if to look in the kacheniye direction the arrow 1, in front above, than behind an arrow 2.
C–Profile blocks, a look in the kacheniye direction an arrow 1, have strong wear in a forward part of "tooth" an arrow 3.
At strongly expressed wear of a protector in the form of a path of a sawtooth form there can be appreciable an amplified shumnost of tires.
Strong wear of a protector in the form of a path of a sawtooth form occurs at too big convergence the wrong pressure of air in tires to big blocks of a protector the tires established on wheels not to a driving axis extreme passing of bends.
Tires with not directed drawing of a protector
At detection of wear of a protector in the form of a path of a sawtooth form it is necessary to change the direction of a kacheniye of the tire. If the strengthened wear of a protector in the form of a path of a sawtooth form and the raised shumnost is found, it is necessary to rearrange wheels cross-wise. It will reduce wear.
On cars with a forward drive efficiency of this approach will be even more appreciable thanks to a bigger istiraniye of tires on a forward axis.
Kacheniye noise directly after shift of wheels will be slightly stronger, however after run of 500-1000 km normal level of a shumnost again will be reached.
Tires with the directed drawing of a protector
At the increased wear of a protector in the form of a path of a sawtooth form on tires of a back axis – mainly at a forward drive – it is necessary to rearrange back wheels forward. At the strengthened sawtooth wear on external edges on one axis both of the tire it is necessary to overturn on a disk. After that the left wheel should be mounted on the right side, and the right wheel on the left.
Wear spots because of movement with the blocked wheels
This type of wear is a consequence of strong braking with the blocked wheels at which on the area of contact of the tire with a paving protector rubber (fig. 4.12) is erased .
When sliding tires on a road cloth heat of a friction which reduces resistance to an istiraniye of a material of a protector is developed.
Even the most wearproof rubber mixes of protectors do not exclude spot of wear which can be formed at extreme braking.
And even the brake systems equipped with ABS, do not exclude short-term blocking and by that small wear.
Degree of such istiraniye essentially depends on speed of movement, a paving and load of a wheel. The following examples are for descriptive reasons given.
When braking car with the blocked forward wheels on a dry paving to a full stop wear of rubber on the area of contact equal to a post card, will make:
– from 57 km/h = 23,8 m of a brake way to 2,0 mm;
– from 75 km/h = 41,8 m of a brake way to 3,3 mm;
– from 92 km/h = 71,6 m of a brake way to 4,8 mm.
Tires with similar damages are unsuitable for further operation and should be replaced.
Reasons of not smoothness of a course
Reasons of not smoothness of a course the various. Not smoothness of a course can appear including because of wear of tires. In use tires not always wear out evenly on all surface of a protector. Because of it already there is a small imbalance which disturbs a quiet kacheniye earlier ideally an otbalansirovanny wheel.
Such imbalance is not felt yet on a wheel, however takes place. It strengthens wear of the tire and reduces thereby service life.