| 摘要 |
1,166,359. Hydropneumatic springs. DAIMLER-BENZ A.G. 28 Sept., 1967 [30 Sept., 1966], No. 44280/67. Heading F2S. A hydropneumatic spring incorporates means for automatic compensation for leakage losses from the hydraulic operating chamber 4. The position of a piston 2, connected to the unsprung mass of a vehicle, controls a valve 10 for supplying hydraulic fluid from tank 17 via pump 9. For a predetermined " normal " vehicle loading the fluid flows back through a return pipe 18. On increased loading however the piston moves upwards and the valve 10 opens the connection to an hydraulic regulating chamber 8, applying pressure via spring diaphragm 12, secondary and primary pneumatic chambers 7 and 5 respectively to spring diaphragm 3 and restoring the piston to the normal position. When the loading is decreased the piston moves down and valve 10 connects chamber 8 to the return pipe 18 so reducing downward pressure on diaphragm 3 and restoring normal position. As leakage occurs from chamber 4 the piston moves up and valve 10 operates to apply pressure to chamber 8 and restore the piston to its normal position by deforming the diaphragm 3. Thus the pressure in chamber 5 is greater than in chamber 3 by the resilient restoring force of the diaphragm 3 and hydraulic fluid passes down through a throttled short circuit 16a to restore the volume of chamber 4. Alternatively if fluid in chamber 4 expands due to heating valve 10 acts to reduce the pressure in chamber 5 and the consequent bending of diaphragm 3 forces fluid up via 19 into chamber 8, to restore the volume of chamber 4. |
