Drive transmissions

Details Drive transmissions Drive transmissions

F - Mech Eng,Light,Heat,Weapons

16

H

180/51

F16H 57/02 (2006.01) F16H 3/093 (2006.01)

Patent

CA 1162150

ABSTRACT OF THE DISCLOSURE 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 gearbox has four layshafts grouped round the drive input shaft. Multi-plate 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.

377932

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