| 摘要 |
<p>Cabs for heavy-duty vehicles are springingly supported by two forward and two rear gas springs (4, 5) on the vehicle frame or chassis. Upper and lower limit stops (10, 12, 11, 13) limit the potential movements of the cab upwards and downwards relative to the chassis. Level controllers (14, 15) adjust the gas pressure so that the cab is kept in a position of equilibrium between the lower and upper limit stops during normal motion of the vehicle. Under certain conditions it may be advantageous that the cab abuts against the lower or upper limit stops. This is effected by a valve system (18), which in one function renders the gas springs (4, 5) pressureless and in another function renders the level controllers (14, 15) inoperative during supply of compressed air to the gas springs (4, 5). It may be sufficient that in certain cases the valve system needs only to be able to perform one of these two functions.</p> |
