| 摘要 |
876,051. Air-spring suspensions; adjusting body height BENDIXWESTINGHOUSE AUTOMOTIVE AIR BRAKE CO. Nov. 6, 1959 [April 20, 1959], No. 37719/59. Class 108(2). A vehicle air suspension comprises an air spring 10, a pressure reservoir 16, and a levelling valve 18 and is provided with means for conserving the air in the system during travel of the vehicle by disconnecting the levelling valve from the reservoir and from the air spring. The said means comprises a valve unit 24 and a two way valve 52. When the vehicle is in motion with the two way valve 52 connected to atmosphere, the valve unit 24 is as shown in Fig. 2, i.e. with check valves 66, 68 closed so that the reservoir 16 and the air spring 10 are disconnected from the levelling valve 18 and no air is transferred through the system. When the vehicle is stopped the valve 52 operates (e.g. in response to door opening and closing or brake application) to connect the control port 48 to the reservoir 16. The air pressure in the control port causes pistons 78, 80, in the unit 24, to move upwards unseating valves 66, to admit pressure to the supply port 40 of the levelling valve, and 68 to allow air pressure to flow from the air spring 10 to the supply and exhaust port 42 of the levelling valve. If the load on the vehicle now changes the levelling valve operates to restore the vehicle height. The valve 52 may be operable by mechanical, electrical or pressure means, and may operate in response to air pressure in the chamber of an air pressure actuated compressor unloader connected to the space above the pistons 78, 80. The latter are spring urged upwardly in this case, so that the air pressure acts on the pistons to maintain them in a down position with the check valves closed when the compressor is unloaded and allows the pistons to move upwardly to open the check valves when air is exhausted from the compressor chamber.
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