Page 89 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

4.3.10.5 Greenhouse effect test for composite wheels
4.3.10.5.1 General

This requirement is to ensure wheels made from composite materials that are
subjected to high temperature conditions (i.e. such as car storage in direct sunlight)
do not suffer concealed damage that could subsequently affect the safety
performance of the wheel during normal use.

4.3.10.5.2 Requirement
When a fully assembled wheel made of composite material, fitted with the

appropriate size tyre and inflated according to the lowest value between maximum
inflation pressure recommended on the rim or the tyre, is tested by the method
described as 4.3.10.5.3, there shall be:

－no failure of any of the components of the wheel;

－no tyre separation from the rim during the test;

－no increase in rim width greater than 2% of the initial maximal width value;

－compliance of lateral and concentricity tolerance according to 4.3.9.1;

－compliance of tyre and rim compatibility according to 4.3.10.3;

－compliance of static strength according to 4.3.9.3

4.3.10.5.3 Test method

A fully assembled wheel, fitted with the appropriate size tyre and inflated according

to the lowest value between maximum inflation pressure recommended on the rim
or the tyre, has to be controlled before the test; lateral run-out has to be controlled
according to 4.3.9.1 and maximum width of the rim have to be reported.

A specific bench as shown in Figure 34 could be used to measure the
maximum width all around the rim with tyre and pressure (continuous

measuring).
The wheel is laid down on the ground of a climate chamber pre heated at 80 °C,

leant on axle and tyre support points, sprocket side of the wheel as shown in

Figure 33, during 4 h. At the end of the 4 h, the wheel should be taken out of the
climate chamber and let cool down at room temperature during 4 h to re-measuring
the rim width and its conformance to 4.3.10.5.1 and 4.3.10.5.2.

第 81 頁共 162 頁