| 摘要 |
1. A trim position changing apparatus for a vehicle with at least partially pneumatic suspension, said suspension comprising at least one suspension cushion (15) which is supplied with compressed air by way of a levelling valve (20) adapted to regulate the trim position of the vehicle about a neutral point and comprising a reservoir (30) which is divided into two chambers (32, 33) by a movable partition (31), of which the first chamber (32) is connected to said cushion (15), characterised in that the second chamber (33) is connected to a distributor (36) adapted to communicate it either with a compressed air source (37) whose pressure is sufficient to reduce the first chamber (32) to a minimum volume by displacement of the movable partition (31), the suspension cushion (15) then being of a volume corresponding to the normal position of travel of the vehicle, or with the atmosphere or the exhaust, the air contained in the cushion (15) then partly passing towards the first chamber (32) and urging the movable partition (31) in the opposite direction to the end of its travel, and that the levelling valve comprises a neutral point shifting means (25) connected to the second chamber (33) by means of conduit (38) in such a way that pressurisation of the second chamber (33) corresponds to a first setting of the neutral point for the travel position and that the communication thereof with the exhaust corresponds to a second setting of the neutral point for the low or stop position which is obtained by the reduction in the pressure following the displacement of the movable partition (31) to increase the volume of the first chamber (32).
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