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公开(公告)号:US4464947A
公开(公告)日:1984-08-14
申请号:US262360
申请日:1981-05-11
CPC分类号: F16H3/093 , F16H57/02 , F16H2003/0935 , F16H2057/02043 , F16H2057/02047 , F16H2057/0206 , F16H2057/0235 , Y10T477/693 , Y10T74/19223 , Y10T74/19233 , Y10T74/19242 , Y10T74/19381 , Y10T74/19391
摘要: An automatic transmission for a city bus and other highway vehicles comprises an engine-mounted gearbox with a laterally offset drive output to the rear wheels through a propeller shaft and differential drive unit. The gear box has four layshafts grouped round the drive input shaft. Multiplate pneumatic clutches, one on each layshaft, select transmission ratios under the control of a driver's selector switch acting through an electronic control unit and an electro-pneumatic valve supplied with air by a compressor. The control unit includes a retarder function provided by simultaneous partial engagement of the first and second gear clutches when the vehicle is in third or fourth gear. Access to the clutches for servicing is provided by end covers on the gearbox whereby the clutch elements can be replaced without stripping the gearbox.
摘要翻译: 城市公共汽车和其他公路车辆的自动变速器包括发动机安装的齿轮箱,其具有通过传动轴和差动驱动单元向后轮输出的横向偏移的驱动。 齿轮箱有四个副轴组合在驱动输入轴周围。 在每个副轴上的多板气动离合器,在通过电子控制单元操作的驾驶员选择开关和通过压缩机供应空气的电动气动阀的控制下选择传动比。 控制单元包括当车辆处于第三或第四档时由第一和第二齿轮离合器同时部分接合而提供的延迟器功能。 通过齿轮箱上的端盖提供对离合器进行维修的操作,从而可以更换离合器元件而不需要拆下变速箱。