This standard specifies the locations of coupling devices, size and clearance space as well as pipe connection for electrical and pneumatic connections between towing and towed commercial road vehicles.
It is applicable to heavy vehicles equipped with pneumatic braking systems and 24 V electrical equipment of the following types: drawbar-trailer combinations whose towing vehicles have rear-mounted couplings or couplings mounted forward and below, center axle trailer combination and articulated vehicles.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 5053.1 Road Vehicles - Electrical Connections between Towing and Towed Vehicles - 7 Pole Connector Type 24 N (Normal) (GB/T 5053.1-2006, ISO 1185: 2003, IDT)
GB/T 13881 Pneumatic Braking Connections between Motor Vehicles and Towed Vehicles (GB/T 13881-1992, ISO 1728: 1980, MOD)
GB/T 20070 Road Vehicles - Mechanical Coupling between Tractors and Semi-trailers - Interchangeability (GB/T 20070-2006, ISO 1726: 2000, MOD)
GB/T 20716.1 Road Vehicles - Connectors for the Electrical Connection of Towing and Towed Vehicles - Part 1: Connectors for Braking Systems and Running Gears of Vehicles with 24V Nominal Supply Voltage (GB/T 20716.1-2006, ISO 7638-1: 2003, IDT)
GB/T 20717 Road Vehicles - Connectors for the Electrical Connection of Towing and Towed Vehicles - 15-pole Connector for Vehicles with 24V Nominal Supply Voltage (GB/T 20717-2006, ISO 12098: 2004, IDT)
GB/T 25088 Road Vehicles - Connectors for the Electrical Connection of Towing and Towed Vehicles - 7-pole Connector Type 24S (Supplementary) for Vehicles with 24 V Nominal Supply Voltage (GB/T 25088-2010, ISO 3731: 2003, MOD)
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
drawbar coupling
mechanical connection device mounted at chassis rear or forward and below, which has the function of guiding, fixing and angular movement when connected with trailers
