Patent GB-398216-A (GB)
Title: Improvements in or relating to shock absorbing devices
IPC: B60G13/04
Filed: 1932-03-02
Abstract: 398,216. Vehicle shock-absorbers. SIMON, L., 5, Rue de Stockholm, and LABORATOIRES INDUSTRIELS FRAN- ÃAIS TELEMECANIQUES L. I. F. T., 3, Rue ThÚodule Ribot, both in Paris. March 2, 1932, No. 6317. Convention date, Jan. 7. [Class 108 (iii).] In a shock-absorbing system on a motor vehicle, frictional disc braking elements are subjected to variable pressure transmitted by a fluid in accordance with the speed of the vehicle from a pump or from the engine lubricating system, the shock - absorbers being constructed with a central pressure chamber actuating annular concentric discs through levers, or with a direct acting flexible chamber and having means for varying the braking effort in accordance with the amplitude of the shocks, such means comprising cam mechanism and also variable throttling orifices. The four shock-absorbers are subjected to varying fluid pressure through the connection 37, Fig. 4, the pressure being obtained from fluid which flows continuously in the circuit formed by the reservoir 11, the up flow suction pipe 12, the pump 31, and the down flow pressure delivery pipe 12, which latter discharges past the spring- controlled sliding valve 39 into the reservoir. The pump is driven from the rotating shaft 22 by worm gearing, and consists of a rotating sleeve 31 and a piston 29 which rotates with the sleeve and is reciprocated vertically by a projection 28 engaging a circumferential cam groove 42 in the cap 10. The opening 32 in the wall of the sleeve 31 is thus alternatively connected with the suction and the delivery sides as the piston rises and falls. The effective size of the tapered throttling orifice 38 in the spring-controlled valve 39 varies with the pressure. Pressure for operating the shock absorbers may be obtained from the engine lubricating system, as shown in Fig. 6. A double piston 55 is subjected on one side to pressure from the engine transmitted through the pipe 53 and on the other side transmits this pressure through the pipe 5 to the shock absorbers. Vents 58 communicate with the space between the pistons. In the construction of shock absorber shown in Figs. 8 and 9, annular friction discs are connected alternately to the fixed cylindrical casing 59 and the arm 79, 86. Pressure is applied to the discs by a piston 67 moving in a central concentric cylinder 62 integral with the casing 59, this pressure being transmitted through levers 70, a thrust ring 74, dished disc springs 75 and rollers 78 bearing against cam surfaces on the members 76, 79 so that the pressure increases with the amplitude of the vibrations. The piston 67 is forced to the left by fluid supplied from the pumps previously described through the pipe 37, past the ball valve 64 and a passage in the wall of the cylinder. When the apparatus is subjected to shocks of excessive amplitude so that the piston is forced backwards, the flow of fluid forces the ball valve 64 on to its seat, so that fluid can then only flow through the small orifices 66. In the modification shown in Fig. 11, pressure is applied directly to the circular braking elements by a flexible member 112 to which fluid is supplied from pumps through the ball valve 64 as previously described.