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Formulary
Exercises

Wheel change
Save Energy
History


Video Transmission
Video Gearbox-gripes
Video History 1
Video History 2
Video Var. Speed Gearbox 1
Video Var. Speed Gearbox 2
Video Var. Speed Gearbox 3
Video Var. Speed Gearbox 4
Video Var. Speed Gearbox 5
Video Light commercial veh.
Video Shift Possibilities
Video Gearshift Lever
Video Transmission (truck)
Video Ecosplit Gearbox
Video Gearshift (truck) 1
Video Gearshift (truck) 2
Video Truck Multi-axle Gearbox
Video Group/Splitter Gearb.
Video Gearbox Lubrication
Video Axilliary Drive
Video Retarder 1
Video Retarder 2
Video Retarder 3
Video Overdrive
Video Synchronising 1
Video Synchronising 2
Video Two-Shafts Gearbox
Video Gearbox (de)mounting 1
Video Gearbox (de)mounting 2
Video Front - Cross-engine
Video 3 Shafts (not coaxial)
Video Gear Shaft
Video Transmission Design
Video Tractive Power
Video Direct Shift Gearbox 1
Video Direct Shift Gearbox 2
Video Direct Shift Gearbox 3
Video Form. 1 Transmission
Video Motorcycle Gearbox

Video Transmission Ratio
Video Three-shafts Gearbox
Video Two-shafts Gearbox
Video Gear Spreading

Video Manual Gearbox 1
Video Manual Gearbox 2


          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Gearshift (trucks)






Assignment

In the truck one must look at the gear changing and the activity of the clutch as a combined occurence. There are more possibilities than is the case with the motor car. Not only that a vehicle can be delivered with, or without a clutch pedal, but also with a pedal that can be folded out of the way. The gearshifting can be eight speeds in the double H pattern, in a simple, single H pattern, or as a sort of joystick with plus- and minus marking.

Function

The gear changing in trucks has always been supported by compressed air. Previously, when one, e.g., shifted from 4th into 5th gear, the group was automatically changed. Nowadays however, a slight amount of support is given with every gear change. The above figure shows the complete controlling unit for the activity of the selector rods. The large lever on the left is for the rod connection with the gearshift, the small black one on the right, for the Bowden cables. In spite of the direct control, an error in the shifting operation is prevented by the RPM supervision of the engine. One can of course, also assign the gear changing completely to a sort of automatic.

More complicated than in the motor car, is the automatic controlling of the clutch. Nonetheless, the driver can still make the choice in especially difficult situations. It then works as usual with hydraulic activity which is supported by compressed air. 06/10




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Translator: Don Leslie - Email: lesdon@t-online.de

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