Patent GB-1265452-A (GB)
IPC: F16D23/06
Filed: 1970-03-05
Abstract: 1,265,452. Synchronizing clutches. SOC. EUROPEENNE DE PROPULSION, and R. E. J. LECAVELIER. 5 March, 1970 [5 March, 1969], No. 10729/70. Headings F2C and F2L. A synchronizing clutch assembly of the baulk ring inertia lock type for automatic transmissions includes a friction coupling mounted on a member rotatable on the input or output shaft and spring returned to a central position from which it is displaced, by engagement of the friction coupling, to. prevent engagement of the dog clutch until synchronism. In the double synchronizing arrangement of Figs. 2 and 4, coupling a central shaft 3 to shafts 1 or 2, friction cones 5.and 6 are rigidly interconnected by rods 8 passing through circular apertures 77 in a  flange 77 of a sliding clutch hub 71, two pairs of baulk pins 9 having necks 93 are arranged in arcuate grooves 51, 61 in the cones 5, 6 and pass through apertures 78 in the flange 77. Split circular springs 55, 56 and 65, 66 urge the pins of each pair together to engage the lands 79, 69 between the apertures 78 and slots 51, 61 to centralize the cones. On moving the clutch hub 71 to the right, for example, the cone 6 engages a cone 21 on shaft 3 and turns relative to the hub so that the land 69 on the cone moves the pins apart to tension the springs until the rods 8 abut the edges of their apertures. Further axial movement of the slide is then prevented by its abutment against the stop collars 86 on the pins 8 until synchronism allows the springs to return the pins 8 to a central position in their apertures 77. Again, Fig. 9 (not shown), engagement of teeth 103, 108 on wheels 102, 106 is synchronized by a friction plate clutch 130 comprising discs 119, 120 fast with the wheel 102, and plates 111, 113 connected by a hub 112 and mounted on the shaft 101 carrying wheel 106, by a flange 115 connected to plate 113 by two springs 125 to centre the plate 113 relative to two stops 126 on the respective plates. On applying hydraulic pressure 148 to a piston 141 to engage the positive teeth, the piston moves to act through rods 117 to slide the wheel 106 until the piston reaches a chamber 144 in its cylinder 143 where it is stopped by fluid pressure acting on its opposite ends, the pressure being exerted also through a valve 155 and lines 153, 123, to engage the friction clutch 130. When the clutch 130 engages, relative rotation between plates 115, 113 tensions the springs 125 and ramps (131), Fig. 14 (not shown), in recesses in the hub 112 act on projections 128 on the rods 117 to move the wheel 106 nearer to wheel 102 until the projections abut a stop, the teeth still not meshing, and the piston 141 is drawn across chamber 144 to remove pressure from its right hand end. When synchronism is achieved, the springs 125 relax, the hub 112 moves back relative to the shaft 101 and the piston 141 acts to move the teeth into mesh, the valve 155 closing to release the friction clutch. A spring 159 in the cylinder 143 disengages the positive clutch. A double synchronizing device may be provided with two hydraulic piston-and-cylinders. To ensure that the synchronizing device comes into action, a delayed action valve (160), Fig. 18 (not shown), is connected to chamber 149 of the jack and includes a piston 162 which moves under non-asynchronous conditions to cause an asynchronous condition by braking the input shaft, engaging the main clutch, or directly tensioning the spring 125.