BS AU 219:1988 download.Dimensions of 40 mm drawbar couplings between commercial road vehicles and trailers.
1 Scope and field of application
BS AU 219 specifies the essential dimensions of a 40 mm drawbar coupling and a 40 mm drawbar eye to permit interchangeability between towing vehicles and trailers equipped with these connections.
These mechanical connections are not interchangeable with the 50 mm couplings specified in ISO 1102.
BS AU 219 applies to mechanical connections designed for commercial vehicles and trailers, the maximum total mass of which is above 3,5 t.
NOTE Terrn relating to drawbar couplings are illustrated in the Annex (Figure 6. Figure 7 and Figure 8) in order to avoid misunderstandings.
2 Reference
ISO 3584, Road vehicles — Mounting of mechanical
coupling devices on rear cross members of trucks.
3 Interchangeability dimensions
The following specifications are set to ensure interchangeability:
— drawbar eye (see 3.1);
— travel angles of the drawbar coupling (see 3.2).
NOTE 1 Dimensions for mounting of drawbar couplings on the rear cross members of towing vehicles are given in ISO 3584. NOTE 2 Dimensions to ensure operating clearance between towing vehicles and trailers will form the subject of a future International Standard.
3.1 Drawbar eye
The dimensional data of the drawbar eye ensuring interchangeability are given in Figure 1. (Details not specified are left to the manufacturer’s choice.) The use of a sleeve is recommended to minimize damage to the inside of the eye, the sleeve being easily replaced when worn out.
Dimensions of the fitted sleeve are specified in Figure 2. Installation of a non-slotted sleeve shall be such that it does not work loose during service.
3.2 Travel angles of the drawbar coupling The drawbar coupling tested separately, i.e. not mounted on the towing vehicle, shall be designed so that it allows for the travel angles specified in Figure 3, Figure 4 and Figure 5, when the drawbar is fixed to the drawbar coupling.