| 摘要 |
The invention relates to a wheeled working machine, particularly a truck-mounted concrete pump, comprising a chassis (10) that is designed as a semi-trailer. The semi-trailer encompasses a tractor (12) and a multi-axle trailer (14) which is connected to the tractor (12) by means of a fifth wheel (16) and carries the working machine. A support structure (38) located in the area of the trailer (14) can be supported on a ground (40) while the semi-trailer is lifted. The support structure (38) comprises two front support booms (42′, 42″) and two rear support booms (44) which can all be swiveled relative to the trailer (14) between a transported position and at least one supporting position. Furthermore, means for lifting and blocking the tractor (12) are arranged on the trailer (14) such that the tractor (12) forms a ballast in the supporting position in order to stabilize the trailer (14) that is supported on the ground (40) with the help of the support structure (38). According to the invention, the actuating mechanism of each front support boom (42′, 42″) has a cylinder-piston unit (54′, 54″) which is designed as a hydraulic cylinder and extends across a front part (52) of the trailer (14). One end of the cylinder-piston unit (54′, 54″) is directly hinged to a bearing eye (56′, 56″) that is fixedly mounted on the trailer (14) while the other end thereof is indirectly hinged to the associated support boom (42′, 42″) by means of a deflection gear (58′, 58″).
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