| 摘要 |
832,895. Maintaining constant road vehicle height. GENERAL MOTORS CORPORATION. June 19, 1958 [July 17, 1957], No. 19610/58. Class 108(2) A constant pressure inlet valve 66 and a constant pressure relief valve 68 are disposed in the conduit networks 38 and 48 respectively, associated with the inlet and exhaust sides of pneumatic road-vehicle suspension springs 12, 14, 16 and 18. A two-way valve 78 is disposed between the exhaust side of the valve 68 and an air cleaner 76 leading to atmosphere. This permits release of unduly high exhaust conduit pressure to atmosphere or the take-up of air from atmosphere. A manually operable valve- 70 may be turned from a normay position (shown) to a position in which the network 48 is connected to the inlet valve 66. This has the effect of applying high pressure air to the exhaust side (41) of each of the levelling valve mechanisms 42, 44, and 46 (Fig. 2). The exhaust valve 55 in each case is lifted by the reverse excess pressure and the springs are extended to a maximum degree for jacking purposes or traversing rough terrain. A twin ball valve assembly 60 prevents flow of air between the two front springs 12, 14, which are controlled by a single levelling valve 42. |
