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Document Title | List of discussion items for the 10th R55 informal group session | ||||||||
Reference Number | R55-10-12 | ||||||||
Date |
18 Jun 2015
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Rulemaking Area(s) | UN R55 Mechanical Couplings | ||||||||
Meeting(s) | |||||||||
Downloads | |||||||||
UNECE server | .docx format | ||||||||
Excerpts from session reports related to this document | |||||||||
R55 | Session 10 | 25-26 Jun 2015 |
Item 2 (Auxiliary usage Class A) (R55-03-09, R55-03-10, R55-03-11, R55-04-05, R55-04-06, R55-04-07, R55-05-17, R55-06-02, R55-07-12) Within the next three month the DIN/VDA will post a New Work Item Proposal with ISO. This proposal will address the auxiliary usage of trailer hitches. Mr. Westphäling will follow the development and report back to our working group. Next meeting Item 12 (Clearance around drawbar coupling) ( ) Item 14 (2nd stage built) (R55-06-02) Item 20 (Heavy transports) (R55-02-13, R55-04-08, R55-04-12, R55-05-01, R55-05-06, R55-05-20, R55-05-21, R55-05-22, R55-07-18, R55-08-13, R55-09-06, R55-10-08; R55-10-09; R55-10-13) Mr. Alguëra commented that his company had checked the proposal against their proposal. From that check he expressed a support for the proposal. Mr Tagliaferri also expressed support. Mr. Conrads was questioning whether the base speed should be 90 km/h rather than 80km/h. Mr Westphäling was hesitant and referred to Australian conditions. Mr. Mátyás pointed out the conditions are such that reducing requirements would at times kill the coupling in very short time of operation. In response to that it was concluded that the utilizing speed dependence as a mean to encompass heavy loads is only applicable to commercial road vehicles where the coupling equipment is designed for a base speed of 80 km/h. The experts will consider the proposal to the next meeting. Next meeting Item 21 (Limiting cases for the usage of certified characteristic values) (R55-04-11, R55-05-05, R55-06-09, R55-07-06, R55-07-14, R55-08-03, R55-08-04, R55-08-05, R55-09-04, R55-09-05, R55-09-11, R55-09- 13, R55-10-03: R55-10-04; R55-10-05; R55-10-06; R55-10-07; R55-10-08; R55-10-15) Mr. Westphäling at the 9th meeting argued that road conditions in Germany are worse than in Australia. To this meeting Mr. Svensson had gathered information that showed that the German Autobahn does not have worse conditions than the Australian roads. Hence the measured forces and the experience over 30 years supporting the ISO18868 are valid. Mr. Stokreef was not present but had prior to the meeting expressed support for the proposal for this item. Mr. Westphäling argued that different engine power and and brakes requirements would the still make the proposal questionable. In response to that Mr. Svensson showed the diagram in the document R55-10-07. There it could be seen that the real high coupling forces is generated neither by traction nor by braking but through interaction between unevenness in the road and the geometric layout of the vehicle combination. Hence the difference in engine power and braking performance is not a significant factor. While support for the proposal is converging Mr. Westphäling wanted to the next meeting to challenge OEM:s and trailer manufactures for more measurements. Mr. Alguëra was doubtful whether there are any better measurements available. Next meeting |
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