Products for Car / Van / 4x4

R&D LABS

OUR R&D LABS

ENDURANCE TESTING

The standard test alone is a marathon event: more specifically, the tyres run  at e.g. 120 km/h in the test rig for over a month, up to a maximum of 1,000  hours. The Endurance Testing department has some 50 test machines, each  of which can subject six car tyres to endurance testing, giving a total of 282  different test positions, while truck tyres can be tested in 92 different test  positions on 23 test machines.

There are also two high-speed test rigs for testing car tyres at speeds as high as 400 km/h or so. Further test machines capable of applying high loads are available for testing truck tyres and special agricultural and industrial tyres.

Endurance_Testing

The purpose of endurance testing is not to find out how a tyre wears but what it can withstand and when and how it reaches the limit of its structural endurance. In addition to the high-speed testing, there are also burst and plunger/bead unseating tests which are carried out to ensure and document compliance with all regulatory requirements. On top of this, testing beyond the limits of structural endurance is also regularly carried out regularly for internal development purposes.

With some 60 members of staff, Endurance is one of largest departments in R&D tyres. Tests are carried out not only on prototypes for new tyre developments but also on random samples from ongoing production. This involves a preliminary inspection of the tyre before it is fitted onto a special wheel rim. The tyre is then conditioned, i.e. pumped up to the required test pressure and  brought up to temperature, before being mounted on the test rig and tested at the desired load and speed. The tyre is repeatedly inspected over the course of the test run, after which it is sent to the analysis group where  it is not just cut open but also given a non-destructive check before. The  investigations reveal where and why the tyre has shown structural findings.

 

The tyre is repeatedly inspected over the  course of the test run, after which it is sent to the analysis group where it is not just cut open but also given a non-destructive check before.

Endurance Testing
 

The high-speed tests are of particular interest for car and van tyres and involve  testing them under conditions that go well beyond their speed symbol (e.g. V=240 km/h) in order to ensure that the tyre is fit for the market.

The test results are evaluated by the tyre analysis specialists and fed back into  the tyre development process. The findings from endurance testing provide vital guidance in product development to confirm that work is progressing in the  right direction towards future tyre models.

Quality management testing for current models accounts for around 25 to 30 percent of the test runs. Most test jobs originate from the product and platform development segments and mainly concern original equipment tyres and tyres for the replacement market.