To improve the comfort and security, it is possible to choose between a free or self steering axle system.
Free steering axle (50% steering)
Free (left) / Locked (right)
The free steering axle follows the direction determined by the tractor. The oscillation range is +/- 15° depending on the tyre size.
To drive on the road (> 15 km/h) or reverse, an hydraulic device ensures a powerful locking and a perfect alignment of the rear axle with the front axle, which thereby ensures the safety of the carriage. A shock-absorber stands for the stability of the free steering axle by preventing significant vibrations.
The self-tracking free steering axle proposed by JOSKIN offers the possibility to keep the advantages of the classical free steering axle, both when driving forward and reversing!
A sensor on the axle detects the driving direction of the vehicle and allows the system to automatically lock one of the two hydraulic rams to make sure the axle works properly. With this configuration, the user does not have to intervene; the automatic free steering axle works autonomously, both when driving forward and reversing.
Self steering axle (100% steering)
Self steering (left and right)
The self steering axle is an important safety component as it keeps your vehicle in the tractor driving line. JOSKIN triple-axle vehicles are standard fitted with a double self steering system (first and last axles) operating in both directions (forward and reverse).
The hydraulic axle ram is operated by a sensor cylinder linked to the tractor by a hitching rod with quick coupling. This one is anchored to the drawbar by means of a knee-joint and controls the hydraulic circuit operating the steering cylinder. The system is balanced by the compensated hydraulic rams that apply the same force in both directions. The circuit is fitted with a one-piece set-up unit including a pressure gauge, two nitrogen accumulators, an aligning valve and a calibrating circuit.
Thanks to its device that automatically corrects the position of the vehicle to take it out of ruts, the self steering system turns out to be the safest and easiest solution.
The electronic steering systems also use hydraulic rams on the axles and keep the same hitching point to the tractor as traditional models, but they are controlled by a microcomputer, via an angular sensor on the drawbar. Unlike the others, they adapt the steering angle in proportion to the speed. The trailer is therefore stable during road transportation and remains particularly easy to handle during manoeuvres.
To sum up, its advantages are:
- manoeuvrability and stability (in case of speed increase, lowering of the degree of the steering angle and locking at 50 km/h);
- no effort between the tractor and the vehicle, especially when reversing; - possibility to manoeuvre the trailer so as to get out of a complicated situation thanks to a control box in the cabin (option).