PTG Tyre Inflation Systems

2 line systems for adjusting tyre pressure while moving

  • AIRBOX/drive 2L Self-propelled sprayers  more >>

    AIRBOX/drive 2L with digital control

    2 line tyre inflation system for self-propelled sprayers


    For sprayers with typically narrower tyres, the use of a tyre inflation system is especially sensible. Through tyre deflection, the relatively small footprint can be significantly enlarged and the heavy weight of the tank distributed better. Apart from reducing rolling resistance, especially deep ruts and their damaging ground compaction can be significantly minimized.


    In principle, the AIRBOX/drive 2 line technology works by transferring air from a stationary component (stator) to a rotating component (rotor). For this process to work, pressure-resilient gasket seals are installed in the stator that in interacting with the rotor cause annular channels through which the air pressure flows, also while the vehicle is moving.


    The rotary joint is screwed onto the wheel studs concentrically to the middle axle using a fitting stirrup. Rotor and stator are embedded lined up with one another. Both a large line and a small control line rotate synchronously with the rotor and are led to the synchronously rotating tyre valve.


    In the rim, a tyre valve with a non-return finger device is installed that will immediately close in the event a line tears and will prevent the tyre from losing pressure.


    The system is connected via a safety valve to the air brake system so that 6.5 bar (94 psi) of pressure supply in the air brake reservoir is guaranteed at all times.


    The rotary joints and the entire air line system at the front and rear axles are pressurized only during an active control cycle. The patented two-line principle ensures that after every pressure change the tyre is closed off and all transfer units (including gasket seals) are depressurized, thereby sparing the system from unnecessary wear.  This technology also sees to it that the tyre loses no air in the event of a leak in the regulating system or a break in the line, thereby guaranteeing increased safety.


    The air lines to the tyre run over the fender through a telescopic tube and are led to the middle of the wheel. Using the telescopic tube, the clearance to the side of the rotating wheel can be individually adjusted.


    The large line and the control line are connected to the rotary joints using quick-action couplings so that they can be easily removed when not in use and placed on the fenders in empty coupling points.


    Operating the AIRBOX/drive 2 line technology is done simply and comfortably using the digital control console in the cab.

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