| 摘要 |
1,205,148. Vehicle suspensions. V. LANGEN, [trading as LANGEN & CO.]. 7 Oct., 1968 [21 Dec., 1967], No. 47430/68. Heading B7D. A hydropneumatic vehicle suspension system incorporates level control as well as means to inactivate the suspension in a fully extended condition to give a substantially rigid connection between the vehicle body and wheels, and comprises hydraulic cylinder and piston suspension unit 20-23 interposed between the body and wheels, the piston chambers 16-19 of which are connected to the hydraulic pressure line 3, on the one hand, through controllable check valves 12-15 and level control valves 5, 6, 7 which connect the chambers to the line 3 or exhaust depending on the mean height of the body above the wheels and on the other hand, through non-return valves 50-53 opening towards the chambers, and a multiport valve 8, to which is also connected the control pressure line 44 of the controllable check valves, the annular chambers 32-35 of the units being connected to hydropneumatic accumulators 36-39 as well as to the lines 9, 10, 11 joining the controllable check valves to the level control valves, the multiport valve 8, in one position 1, pressurizing the control line 44 and connecting the lines 45-48 to the non-return valves to exhaust, and in the other position connecting the control line 44 to the exhaust while connecting lines 45-48 to the line 3. When the line 44 is pressurized, the valves 12-15 open so that bump and rebound cause cycling of the hydraulic liquid between the pistons and annular chambers, springing being provided by the gas springs in the accumulators 36-39, the level control valves, due to throttling elements 40-43 coming into effect only when changes occur in the vehicle loading. When line 44 is depressurized, i.e. in position 2 of valve 8, the check valves open only towards the piston chambers which are now connected to the line 3 through non-return valves 50-53 causing the suspension units to extend to their limit stops in which position the annular chambers of the units are connected to exhaust so that the full area of the piston is effective in supporting the load, and as the piston chambers are isolated because of the non-return and the controllable check valves a substantially rigid fully extended suspension is obtained which can support loads greater than those that can be supported at the maximum pump pressure. |
