GB559171A - Multi-wheel bogie for heavy trailers - Google Patents

Abstract

559,171. Trailer vehicle suspensions and fore-carriage turning-arrangements. NORTH, O. D., HUGH, P. G., and SCAMMELL LORRIES, Ltd. July 7, 1942, No. 9380. [Class 108 (ii)] A multi-wheel bogie for a trailer comprises a turntable 2 or main body provided fore and aft on its longitudinal centre line with two co-axial, independent, horizontal trunnions 17 and midway between its ends with two co-axial lateral trunnions 18, a quadrilateral frame formed by four beams 19, 20 universally jointed to each other and articulated midway between their ends to the trunnions, and wheel axles, to which the road wheels 1 are connected, carried by a parallel pair of the beams. In the eight-wheel, dirigible bogie shown, the trunnions 17, 18 are carried by brackets 17a, 18a welded to the turntable 2, and the beams are connected together by ball and socket joints 23, 24 which may incorporate toughened rubber to compensate for the arcs of travel of the ends of the beams, or short links or other means may be provided for this purpose. Alternatively, one pair of beams may have a limited sliding movement on their trunnions to accommodate the arcuate movement of the other pair of beams. The axle housings 27 of each pair of road wheels 1 have projecting parts 27a journalled on longitudinallyextending trunnions 28 secured in transverse webs 26 of the side beams 20 so that the four wheel axles have independent freedom of oscillation in transverse planes. Laminated springs, rubber shock-absorbers, &c. may be interposed between the axle housings and the turntable to limit oscillation of the beams. For steering purposes the turntable 2 is adapted to turn on a king-pin 3 fixed centrally in a cross framemember 5 at the end of the trailer chassis 6, a ball and socket connection 3a, 7 between the turntable and king-pin allowing limited universal movement of the turntable. This movement is damped by compression springs 8 each interposed between the member 5 and a plate 11 pivoted on brackets 10 thereon, a rod 13 held by a nut 12 on the plate 11 passing freely through the spring and the member 5 and having at its lower end a ball and socket connection 13a with a block 14 which bears on an annular anti-friction rail 15 fixed to the turntable. In a modification applied to a four-wheel bogie, the beams 19 are replaced by transverse axles on the ends of which the wheels are mounted.