GB489073A - Improvements relating to frames for railway vehicle trucks - Google Patents

Abstract

489,073. Railway-vehicle undercarriages; dash-pots. BUGATTI, E. Aug. 24, 1937, No. 23212. Convention date, Aug. 24, 1936. [Classes 103 (vi) and 108 (iii)] In a railway-vehicle bogie of the kind in which two side-frames are flexibly connected to a transverse frame member, resilient means are incorporated in the frame tending to maintain the members in a normal, non- distorted position. In the construction shown in Fig. 1, a tubular transverse member 1 is fitted at its ends with arms 44 carrying pins 45 which engage within resilient sleeves 46 of rubber or like material inserted in apertures in the side-frames 2. The vehicle body may be supported on side-bearings at the midpoints of the frames 2, while the member 1 may have a central aperture to receive the king-pin, the movements of which may be additionally controlled by a dash-pot incorporated in the member 1. Thus, as shown in Figs. 2 and 3, the cylinder 1 is formed with integral upper and lower flanges 3 providing flat surfaces, on the upper of which are disposed two side-bearings including seats 4, slides 5, rollers 36 and convex curved plates 6. The king-pin 21 passes into the interior of the cylinder 1 and is provided at its lower end with a ball 19 co-operating with a divided thrust sleeve 20 and an hydraulic dash-pot. Dash-pots. Built into the cylindrical portion of the member 1 is a pair of cylinders 11, 12, which are provided respectively with apertured pistons 22, 23 co-operating with fixed rods 28 of variable cross-section, the inner ends of the cylinders 11, 12 being interconnected by pipes 33 and a reservoir 34. The piston rods 24, 25 are directly actuated by the ball 19, while between the sleeve elements 20 and the cylinders 11, 12 are disposed springs 17, 18 each contained within a pair of cages 13, 14 and 15, 16 capable of relative movement. If, for any reason, the body tends to move, say, to the left, relative to the truck frame, the piston 22 will be displaced in the cylinder 11 against an increasing resistance, while the piston 23 will move with comparative freedom, the entrance of the piston rod 24 into the cylinder 11 effecting a transfer of fluid via pipe 33 to the cylinder 12. At the same time the spring 17 is compressed and subsequently assists in restoring the parts to a central position. The pistons 22, 23 may be fitted with relief valves 26, while the resistance of the shock-absorbing cylinders may be adjusted by altering the position of the rods 28.