Deflectable touchdown wheel system for sprayer boom
A deflectable touchdown wheel system for a sprayer boom of an agricultural sprayer is provided that includes a touchdown wheel that deflects transversely when contacting the ground at an angle, damping ground contact impact forces at the sprayer boom reducing reactionary forces such as external steering inputs at the sprayer vehicle.
1. A deflectable touchdown wheel system for use with a sprayer boom of an agricultural sprayer, the sprayer boom including a boom segment extending along a boom axis transverse to a direction of travel of the agricultural sprayer during operation, the deflectable touchdown wheel system comprising:
a mounting bracket operatively connected to the boom segment of the sprayer boom;
a wheel support;
a wheel rotatably supported by the wheel support and configured to contact a ground surface during a touchdown event of the sprayer boom; and
a deflection arrangement interconnecting the wheel support to the mounting bracket, the deflection arrangement configured to allow the wheel support to pivotably deflect relative to the boom segment about a pivot axis perpendicular to the boom axis during the touchdown event; wherein:
the deflection arrangement is connected to an end of the mounting bracket;
the deflection arrangement includes a pivot block and a pivot pin extending through the pivot block for receiving the wheel support thereon;
the wheel support comprises a wheel support yoke including a pair of legs extending on opposite sides of the wheel;
the pivot block includes a block pivot hole and the wheel support yoke includes an upper body segment with a yoke pivot hole aligned with the block pivot hole;
the pivot pin extends through the block and yoke pivot holes for allowing movement of the wheel support yoke relative to the mounting bracket by way of the pivot axis defined by the pivot pin arranged above the wheel and transversely with respect to a rotational axis of the wheel; and
the deflection arrangement includes a pair of springs extending along corresponding spring axes being generally parallel to the boom axis and being on opposite sides of the wheel support, each of the springs of the pair of springs configured to compress during the touchdown event to absorb energy of the touchdown event and extend after the touchdown event to restore the wheel support to a neutral position.