parallel fork like members fixed to the undercarriage 12 or its limb 26 respectively if a straight line is drawn through the bearings 80 and 82 the bearing 84 is always situated laterally of this straight line namely on the side that faces the motor operator 60 the brace or strut 78 extends between a bearing 88 on the bracket 46 in the upper rear region of the wheel suspension 16 and the bearing 82 on the reversing element 76 the brace 78 may even be provided with a spring in order to additionally dampen shocks the function of the embodiment shown in fig7 is as follows specifically the undercarriage 12 is supported on the ground by the wheels 14 wherein an essentially rigid connection that contains the motor operator 60 arranged in a pivoted fashion on the limb 26 the reversing element 76 the brace or strut 78 and the wheel suspension 16 counteracts a downward movement of the undercarriage leaving aside the elasticity that is inherent to each component only the gas pressure reservoir 56 performs a spring function this means that the gas cushion of the gas pressure reservoir 56 is more or less compressed when the wheels 14 move over a rock or similar uneven terrain or obstacle in such instances the wheel suspension 16 according to fig7 is pivoted in the counterclockwise direction the strut 78 is raised and the reversing element 76 is also pivoted about the bearing 84 in the counterclockwise direction due to this pivoting movement the piston rod 70 presses into the cylinder housing 66 and compresses the gas cushion in the gas pressure reservoir.