| 摘要 |
PURPOSE:To effectively absorb impact force exerted to a trailer, by employing a coupler which is swingable in the rolling direction of a vehicle, and by disposing air-bellows between a verticaly movable swing frame having a king pin and a body frame. CONSTITUTION:A coupler coupled with a king pin 15 attached to a trailer 12 side is provided between a tractor 11 and the trailer 12, being fixed on a tractor frame 13. This coupler 5 is consituted to support a swing base 7 into which the king pin 15 is inserted to be coupled, being swingable by means of pins 9, 10 vertically arranged in a cruciform shape, in the pitching and rolling directions. Further, the king pin 15 is provided at the front end of a swing arm 16 journalled to the front center section of the trailer 12. Further, two right and left air bellows 20 and a shock absorber 25 are disposed between the front end side of the swing arm 16 and a receiving beam 19 intengrally incorporated with a trialer body frame 14.
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