| 摘要 |
The invention relates to a fifth wheel coupling comprising essentially a fif th wheel plate (1) and a pair of pillow blocks (2) for the attachment on the frame of a truck tractor. The fifth wheel plate (1) pivots around an axis (3) in relation to the pillow blocks ( 2) and on its underside, is equipped with a pair of hollow cylindrical bearing troughs (5) , while the pillow blocks (2) have corresponding cylindrical bearing surfaces (8). Below the bearing surface (8), the pillow block (2) is equipped with an eye (9) for the penetration of an attachment bridge (7). The invention has the object of reducing the weight of fifth wheel couplings of this type and to lower the manufacturing cost without thereby complicating the assembl y or having to omit an adjustment to differing mounting widths. The solution proposes on the one hand, the manufacture of the pillow blocks (2) as one piece from a casting with a vertical mounting flange (13) to permit the direct lateral attachment to longitudinal members (14) of the truck tractor; and on the other hand, the u se of bearing shells (6) with side walls (16, 17) of differing thickness, in order to be able to implement a closely stepped, if necessary also continuous adjustment within the framework of a separately specified coarsely stepped adjustment to given mounting widths. The measures according to the invention have the advantage that on the one hand, the required bores in the longitudinal members may be transferred from the flang es to the web which undergoes less stress and that on the other hand, the continuous or closely stepped width adjustment is switched to the bearing shells which are most often manufactured of synthetic materials and thus are easier to work on. Furthermore, this leads to a more favorable and always defined flux of force, because the bearing forces are transmitted via the fifth wheel plate (1) and the pillow blocks (2) directly to the web area of the longitudinal members (14).
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