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US 5,488,878 AGranted
Gear transmission with controller
AssigneeZR Friedrichshafen AG
InventorDieter Manz
Life of this patent
Estimating the term…
Abstract
Synchronized forward speed ranges and an unsynchronized reverse range are automatically selected in a gear transmission. The reverse speed range is selected when with an open main clutch at first a synchronizing device for a forward speed range is actuated and once a permissible shifting speed is reached this shifting is started and the reverse speed range is selected. The main clutch remains open for the duration of the shifting operation.
Claims2
A method of operating a transmission having:
- a main clutch adapted to be connected to an engine;
- an input shaft connected to the main clutch and connectable therethrough to the engine in a closed condition of the main clutch;
- an output shaft adapted to be connected to a load;
- at least one forward-range input gear and at least one reverse-range input gear continuously connected to and rotated by the input shaft;
- a forward-range synchronizing device and clutch operable to synchronize and couple the forward-range input gear with the output shaft;
- and
- a reverse-range jaw clutch for coupling the reverse-range input gear with the output shaft,
- the method comprising the steps of:
- monitoring the rotation rate of the input shaft;
- for forward travel sequentially,
- opening the main clutch,
- closing the forward-range device and clutch to first synchronize the forward-range input gear and the output shaft and then couple the forward-range input gear and output shaft together,
- closing the main clutch;
- and
- for reverse travel when the output shaft is generally stopped sequentially,
- opening the main clutch,
- closing the forward-range synchronizing device when the rotation rate of the input shaft is below a predetermined switching-in rate to couple the input gears and input shaft to the output shaft and thereby slow any rotation of the input gears and input shaft to below a predetermined threshold rotation rate,
- opening the forward-range synchronizing device,
- closing the reverse-range jaw clutch, and
- closing the main clutch.
17 more elements
Dependencies are inferred from the claim text.