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| Document Title | TRL EC child safety project–summary of chest behaviour results | ||||||||
| Reference Number | CRS-54-09 | ||||||||
| Date |
28 Oct 2015
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| Summary | Summary of investigations into belt slippage (clavicle and neck) and chest deflection to define areas for improvement of the test procedures under UN R129. | ||||||||
| Source(s) | TRL | ||||||||
| Rulemaking Area(s) | UN R129 Enhanced Child Restraints | ||||||||
| Meeting(s) | |||||||||
| Downloads | |||||||||
| UNECE server | .pdf format | ||||||||
| Excerpts from session reports related to this document | |||||||||
| CRS | Session 54 | 27 Oct 2015 |
6.3.2. CRS-54-09e on chest behaviour results. The Q-series dummies are able to measure chest deflection (P-series dummies are not) but the shoulder belt tends to move towards the neck. The maximum deflection is due to chin to chest contact. Chest deflection limits are proposed but still not validated. We can see some potential solutions to solve previous problems by creating a test environment that prevents belt slippage from occurring, propose an assessment procedure for the static belt lie & useful injury threshold limits. For this study, deflections were measured on the clavicle for the Q3 & Q6 dummy. However, during testing a bottoming-out was observed; there was a hard contact between clavicle and neck bracket. Two input conditions were tested (R129 & extreme D ring position) without CRs, with booster seat & with booster cushion. In conclusion and for summary:
Recommendations for TRL are:
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