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running gear

running gear

The double-axle running gear with "Roll-Over" bogie offers, thanks to its design, a complementary suspension system to the wheels as well as a larger contact surface with the ground. It consists of 2 axles connected by parabolic leaves and is bolted to the chassis by what is commonly known as "the table", a large support that balances and distributes the loads in an optimal way. With its maximum clearance of 240 mm, it can absorb the irregularities in the terrain. Thanks to the position of the cross-axis under the spring leaves and the position of the axles above the ends of these same leaves, a pull line pushes the front axle over the obstacle. The advantages of this design are manifold: in addition to a lower centre of gravity and thus a better stability, the required traction power is significantly reduced. JOSKIN assembles its own bogies, which means that they can be made to measure for your vehicle. The distance between the axles and therefore the length of the leaves can be adapted to each machine, e.g. according to the choice of tyres. All JOSKIN “Roll-Over” bogies are bolted and therefore movable.

The JOSKIN Hydro-Tandem and Hydro-Tridem running gears combine simplicity, reliability, high clearance and stability. The vehicle can indeed be easily pulled over any obstacle thanks to its semi-independent axle concept. The vehicle is pulled by leaves attached to an element under the chassis, which is itself located in front of each axle, thus offering a large clearance of up to 250 mm. The working principle of this suspension is based on the law of the communicating vessels. Only the hydraulic rams on the same side are connected to each other in a closed circuit. The independence of the circuits on both sides of the vehicle, combined with the fact that the oil is incompressible, ensures a perfect lateral stability. As a result, the vehicle is less likely to tilt in bends and on hills. Moreover, thanks to this design, the pressure transmitted to the ground is perfectly distributed between all the wheels, which also spares the soil structure.

The vehicles equipped with a Hydro-Tandem or Hydro-Tridem running gear can be delivered with an automatic height-adjustment: this system allows the suspension to be easily calibrated in "road" configuration after passing under a bridge, a tunnel, after maintenance work, etc., for which it is normally necessary to lower the suspension of the running gear to the stop.