Working draft amendment to UN R55 to introduce:

• An amendment that concerns a separation of requirement calculation procedures from the procedure of setting and certifying performance values.
• An amendment that adds procedures for requirement calculation for vehicle combinations that have hitherto not been accounted for in the regulation.

Proposal to introduce a procedure to identify allowable combinations of performance values DC and V for drawbar coupling equipment.

Proposal to introduce amendments on the secondary coupling and the attachment points.

Proposal to introduce amendments on the secondary coupling and the attachment points.

UN R55 informal group working draft to introduce:

• Correction error in annex 5 figure 12 and 17
• An amendment that concerns identification of worst cases for design assessment
• Clarifications on minimum articulation angles.

Proposal to introduce amendments on the secondary coupling and the attachment points.

Working draft amendment to UN R55 to introduce:

• An amendment that concerns a separation of requirement calculation procedures from the procedure of setting and certifying performance values.
• An amendment that adds procedures for requirement calculation for vehicle combinations that have hitherto not been accounted for in the regulation.

UN R55 informal group working draft to introduce:

• Correction error in annex 5 figure 12 and 17
• An amendment that concerns identification of worst cases for design assessment
• Clarifications on minimum articulation angles.

Copy of the proposal by Poland to amend UN R55 to ensure that coupling devices are only approved for use on vehicles approved for towing trailers.

Draft proposal to introduce amendments on a procedure to dimension coupling equipment for heavy transports through speed reduction.

Draft proposal to introduce amendments on a procedure to dimension coupling equipment for heavy transports through speed reduction.

Proposal to introduce a procedure to identify allowable combinations of performance values DC and V for drawbar coupling equipment.

Draft text to introduce provisions for minimum articulation of couplings in order to prevent damage from maneuvers that exceed coupling capacities.

Correspondence concerning the French position on this work item.

Information on TAAM discussions concerning cases where the sum of the mass of the towing vehicle (M) [T] and the mass of the towed vehicle (TM) [R or C] is higher than the maximum combination mass (MC) set for the towing vehicle.

Working draft proposal of the UN R55 informal group for a uniform procedure to rate couplings for extreme heavy transport configurations based upon a speed-reduction method. The intent is to address conditions where there are no coupling products with appropriate certified performance values.

Proposal for a higher vertical load for drawbar couplings with a jaw that pivots about the horizontal transverse axis.

Draft proposal of the informal group on UN Regulation No. 55 to modify Figure 17 – annex 5 – Dimensions of spring-mounted steering wedges.

Proposal to introduce provisions for minimum articulation of couplings in order to prevent damage from maneuvers that exceed coupling capacities.

Working draft proposal of the R55 informal group to introduce amendments concerning:
(a) Identification of worst cases for design assessment, and
(b) Procedures for COP.

Pending requests and future items for changes to UN R55.

Proposal as developed by the UN R55 informal group during its 12th session. This proposal concerns a procedure to identify allowable combinations of performance values Dc and V for drawbar coupling equipment. This proposal would amend the Revision 2 proposal for UN R55.

Revised proposal developed by the UN R55 informal group to introduce provisions for mechanical couplings used in modular vehicle combinations (e.g., rigid truck + dolly + semi-trailer) presently not addressed within the regulation.

Proposed text for determining worst case conditions for physical testing of couplings.

Informal group schedule for finalizing amendments to update UN R55.

Revised version of document GRRF-80-41 pursuant to the 12th UN R55 informal group session. GRRF-80-41 was the revised formal proposal to GRRF to update UN R55 with respect to:
a) Requirements on remote indication,
b) Availability of information on coupling fixing points for A50X couplings,
c) On lateral strength of drawbars, and
d) a new class definition for fully automatic drawbar couplings.

Proposal to allow for a vertical load up to 80 kg for drawbar coupling designs with a jaw that pivots about the horizontal transverse axis because such configurations are commonly used in fire trucks and other special use vehicles in Germany, Austria and Switzerland.

Chronology summarizing the discussions held on agricultural coupling requirements under UN R55 since 2011.

UN R55 does not include provisions for minimum articulation angles of couplings. However, couplings may be damaged if a vehicle combination takes a narrow curve or other maneuver that exceeds the coupling design. In order to prevent coupling failures, this proposal suggests minimum articulation requirements based partly upon ISO 1726-1 and 11407 for drawbar and fifth wheel couplings.

Updated version of the text following the 11th R55 informal group session and highlighting the changes

Updated version of the draft consolidated revision of UN R55 following the 11th R55 informal group session.

Draft proposal under development within the R55 informal group.

Proposal under preparation for the GRRF by the R55 informal group. This proposal concerns a procedure to identify allowable combinations of performance values Dc and V for drawbar coupling equipment. This proposal would amend the Revision 2 proposal for UN R55.

The text reproduced below was prepared by the experts of the informal group on UN Regulation No. 55 and introduces amendments on:
a) Requirements on remote indication;
b) Availability of information on coupling fixing points for A50X couplings;
c) On lateral strength of drawbars;
d) Includes a new class definition for fully automatic drawbar couplings.

List of pending proposals for the update to UN R55 from GRRF participants.

Australia Road Research Board (ARRB) Internal Report related to ISO/TC22/SC15/WG4 N 535 Annex 5.

Australian research paper suggesting that an air-suspended tandem converter dolly could pitch significantly under braking as compared to mechanically suspended dollies.

Working draft of the comprehensive update to UN R55 from the Informal Group on Amendments to UN R55.01.

E-mail communication between the WP.29 secretariat and the UN R55 revision informal group proposing the drafting of a new consolidated version of the amended regulation incorporating all the informal group changes.

Revised drawings prepared for the informal working group amending the regulation.

Presentation to explain the historical background behind the work of ISO/TC22/SC15/WG4 and the UN R55 informal working group.

Review of the development of ISO 12357-3.

History of discussions concerning the D-value on modular vehicles and combinations with more than one trailer.

Reworked version of document TFAC-05-10.

Reworked and restructured version of document TFAC-05-10.

Proposal to introduce amendments on:
a) Requirements on remote indication;
b) Availability of information on coupling fixing points for A50X couplings;
c) On lateral strength of drawbars;
d) Includes a new class definition for fully automatic drawbar couplings.

Proposal to introduce amendments on applications in multi-vehicle combinations.

Proposal to introduce amendments on the test procedure and installation of couplings belonging to class K and L.

Second revision of the draft text proposing to introduce amendments on the test procedure and installation of couplings belonging to classes K and L.

Working draft amendment to UN R55 from the Informal Group on Amendments to UN R55.01.

Working draft proposal from the informal group on Regulation No. 55 to update the provisions concerning Class K hook-type couplings when coupled with class L toroidal drawbar eyes.

Class S couplings refer to non-standard national/regional couplings that remain in use despite the broad trend towards harmonization around an agreed set of couplings specifically covered by other UN R55 classes. The aim of this proposal is to tighten and clarify the requirements for such couplings while discouraging the development of new non-standard Class S couplings (such that new designs would result in new classes if needed).

Draft proposal by the informal group on UN Regulation No. 55 to introduce amendments concerning coupling applications in multi-vehicle combinations.

The pending Revision 3 to the 1958 Agreement opens the way for virtual or simulation testing for use in type approvals. This presentation considers the proposed amendment and its application to mechanical coupling approvals.

Working draft proposal of the informal group on UN Regulation No. 55 to introduce amendments on:
(a) Requirements on remote indication;
(b) Availability of information on coupling fixing points for A50X couplings;
(c) On lateral strength of drawbars;
(d) Includes a new class definition for fully automatic drawbar couplings.

Expanded version of the earlier information in document R55-08-13.

KBA has noticed that class H50 couplings are not defined and so proposes to add this class and definitions to UN R55.

Reformatted working draft text prepared by the informal group on UN Regulation No. 55 to introduce provisions for agricultural couplings and related applications.

UN R55 Revision 2 draft as amended by GRRF/2014/28 (GRRF/2015/7, Supplement 4 to the 01 series), GRRF/2015/14, and R55-08-05.

The text prepared by the informal group of experts on Regulation No. 55 to introduce amendments on the test procedure and installation of couplings belonging to classes K and L.

Status of the various items under discussion for the updating of UN R55 on mechanical couplings.

Observations on type-approval and “in-use” requirements under UN R55 and proposal to develop a new Annex that would provide a more coherent approach to evaluating/limiting acceptable in-use stress loads than in the current regulation.

The expert group on UN R55 submitted document GRRF/2014/14 to update the requirements for mechanical couplings, including a proposal to replace the references to IS0 7641:1983 with ISO 7641:2012. In response to issues raised within GRRF, the experts prepared a new proposal (document GRRF/2014/28). This document would supplement the proposal by providing additional information on the differences between the 1983 and 2012 versions of ISO 7641.

Requirement of a brake away cable also for drawbar-couplings

E-mail correspondence with regard to the application of provisions in New Zealand standard NZS5446:2007 for tyre scuffing forces to the approval of drawbars for lateral forces under UN R55.

Diagram to clarify the clearance of the drawbar coupling in Annex 7 of the regulation (Action Item 12 of the informal group).

Recommendations on test conditions for drawbars and couplings, including hook and pin couplings.

Estimation of test force F times distance, L, from drawbar eye to turning center, i.e. F*L on one axle, two axles, and three axles.

Review of in-use requirements related to towable mass and coupling equipment towards development of an appropriate evaluation procedure for use at the time of type approval.

Proposal to require information on the maximum weight for a towing vehicle for declaration on the type-approval plate. This proposal responds to the discussion on a 32-ton weight limit which is an EU regional limit not acceptable across all stakeholders. Sweden proposes to satisfy the European interest through this informational requirement without instituting a blanket weight restriction.

Remote indicators confirm the status of a truck-trailer coupling. The intention of this proposal is to open the definition of ‘remote indicators’ to some systems currently on the market where the remote indication is not in the vehicle cab but on the side of the vehicle (on the chassis) close to the remote control.

Comments for discussion concerning the draft Supplement 4 to the 01 series of amendments to Regulation No. 55 as submitted for the February GRRF session (document GRRF/2014/14), proposing clarifications, in particular to align the text with ISO 7641:2012.

Response to the proposal (in document R55-05-12) to require more information from manufacturers on towbar fixing points in order to facilitate the work of technical services and approval authorities.

Action item list with the status of items involved in the updating of the UN Regulation on mechanical couplings.

E-mail exchange between the R55 informal group chair and the Lohr group concerning drawbar and fifth wheel designs.

Proposal to modify performance calculations and limits under UN R55. Currently UN R55 prohibits a vehicle combination with required performance values Dreq, Dc-req, Vreq and Sreq where Dc-cert ≤ Dc-req ≤ Dcert and Vreq ≤ Vcert. However, a requirement combination such as Vreq = 0.1* Vcert and Dc-req ≤ Dcert +0.1*( Dcert – Dc-cert) better reflects the real-world situation commonly found in combinations comprising a rigid truck, converter dolly, and semi-trailer.

Italian-language document concerning tow bars.

E-mail explaining background on ISO 15263, development of French standard, and the use of bicycle racks in association with tow bars to support discussion of revisions to the regulation on mechanical couplings.

List of amendments being considered by the informal group updating the regulation on mechanical couplings and their status vis-à-vis submission to the Working Party on Brakes and Running Gear.