| 摘要 |
Fifth wheels are used to establish an articulated connection between a truck tractor and a semi-trailer. They consist of a plate (1) which is attached to the truck tractor and generally has at least one arched slideway lining (4a,4b) acting as a bearing surface and fitting into corresponding recesses of the fifth wheel plate (1) where it is fastened. According to the invention, fastening is provided in the form of a positive fit connection, whereby the lower part of the slideway lining (4a, b) and the upper part of the plate (1) have joining elements (6,8) to ensure a rotationally locked positive fit, thus enabling thermal dilation to occur in the fifth wheel plate (1). Preferably, the positive fitting joining elements for the lower side of the slideway lining (4a, b) are configured as ribs (6) extending radially outwards from a virtual centre point (7) and the positive fitting joining elements for the upper side of the fifth wheel plate (1) are configured as complementary grooves (6). Fastening elements such as screws or snap-in connections make sure that the fit remains positive.
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