Road vehicles - Stabilizing devices for caravans and light trailers - Part 1: Integrated stabilizers
1 Scope
This document specifies the technical requirements, test methods, installation instructions and marking of stabilizing devices.
This document is applicable to integrated stabilizers for central-axle (single-axle or tandem- axle) trailers up to a maximum laden mass of 3.5t and integrated stabilizers conforming with ISO 3853-compliant towing devices.
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.
ISO 3853 Road vehicles - Towing vehicle coupling device to tow caravans or light trailers - Mechanical strength test
Note: GB/T 25988-2010 Road vehicles - Towing vehicle coupling device to tow caravans or light trailers - Mechanical strength test (ISO 3853 : 1994, IDT)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply
3.1
stabilizing device
integrated or additional device placed between a towing vehicle and the centre-axle trailer whose main purpose is to reduce or to prevent oscillations about the articulation axis and to reduce pitch and roll
4 Technical requirements
4.1 The action of the stabilizing device shall be approximately uniform and continuous on both sides
For stabilizing devices in which damping in the driving derection takes place by mechanical friction, the maximum and minimum damping moments in the region covered by an articulation angle of 5° to the left and to the right of the central position shall not differ by more than 30%.This shall be measured with the stabilizing device mounted on a test bench, with the force on the stabilizing device being slowly increased to move it through the articulation angle.
4.2 The minimum angular displacements possible in the attached state shall be
- ±60° for articulation angle, α, see Figure 1,
- ±7° for pitch angle, β, see Figure 2, and
- ±8° for roll angle, γ, see Figure 3.
Coupling and uncoupling of the stabilizing device and the towing device shall be possible at α=±60°, β=±7° and γ=±8°.
The articulation angle α of the stabilizing device itself, without pitch or roll, shall not be less than ±75°.
4.3 The static forces generated by the stabilizing device shall not exceed the permissible static loads for the surrounding components.
4.4 The damping moment about the vertical axis running through the coupling point (the articulation axis), Mart, as determined by simulated oscillation testing according to 5.2, shall not exceed or 0.46 mR - whichever is the smaller, but Mart shall be not less than 0.07 mR, see Figure 4.
Note: mR is the maximum mass of trailer meeting ISO 3853, in kg.
4.5 The resultant, Mres, of the moment caused by the vertical static force generated by the stabilizing device and the moment due to pitch through the angle given in 4.2, Mpitch, shall not exceed or 0.4 mR - whichever is the smaller - when determined by simulated oscillation testing according to 5.3, see Figure 5.
4.6 The moment acting on the towing device as a result of roll, Mroll, shall not exceed 300 N·m or 0.4 mR - whichever is the smaller - when determined by roll oscillation according to 5.4, see Figure 6.
