| 摘要 |
A tandem axle suspension in which the air pressure in an air spring (28) is controlled by a valve (40) which in turn is responsive to the load at the end of a leaf spring (12) to balance the load on a leaf spring axle (14) with the load on a tag axle (30). A crank mounting (36) connects the end of the leaf springs (12) to the valve (40). The valve (40) has a fixed valve seat (132) and a movable valve seat (116) both of which seat against a movable flat valve element (150). The movable valve seat (116) is biased against the movable flat valve element (150) in part by the load on the leaf spring (12) so that the valve seat (132) and the flat valve element (150) will separate when the load on the leaf spring axle (14) increases. The flat valve element (150) is biased against the fixed valve seat (132) in part by the air pressure int he air spring as the flat valve element (150) closes against the fixed valve seat (132) when the load on the tag axle (30) is at least equal to the load on the leaf spring axle (14). The movable valve seat (116) is biased away from the flat valve element (150) by the air pressure in the air spring so that the movable valve seat (116) separates from the flat valve element (150) when the tag axle load exceeds the leaf spring axle (14) load. An exhaust passageway (114,100,180) is provided to exhaust air from the air spring (28) to reduce an excess load on the tag axle.
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