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Gearbox with Clutch for Each Ratio

10th October 1952
Page 37
Page 37, 10th October 1952 — Gearbox with Clutch for Each Ratio
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IN agearbox produced by Zahnradfabrik Friedrichshafen A.G., Fricdrichshafen, Lake Constance, and shortly to be sold in Britain, gears are selected through inbuilt friction clutches capable of transmitting the full engine torque on each ratio. All the gears have helically „.eut teeth and, of course, run in constant mesh.

The only use for the normal clutch is when moving away from rest and when selecting reverse gear. Gear selection is by a small lever mounted on the steering column. This lever is moved forward to engage a higher ratio, its return to neutral being automatic.

Lower ratios arc engaged by moving the lever in the opposite direction and no finesse is required, as the lever moves straight through without need for a gate. In a sixforward-speed version of the gearbox, designed for use on heavy commercial vehicles, the gear lever is connected to an electric motor.

When the lever is moved, current passes to this motor, which turns a control cylinder mounted on the gearbox. This cylinder has a number of face cams machined across its periphery and, according to the position in which the gear selector is placed, the appropriate train of gears is coupled up through the action of a multi-plate steel clutch.

Gears can be selected at any road speed without the possibility of noise being produced, and as the teeth of the gears are helically cut the unit is particularly quiet running. There are five multi-plate clutches, one for each of the first five ratios, and a dog clutch for top gear. Reverse is engaged by using the normal clutch.

The IF Media gearbox has been designed to take the

torque of units up to 130 b.h.p. and provides the following ratios: 8.3, 5.5, 3.6, 2.4, 1.5 and I to 1, with a 5 to 1 reverse. It has an approximate weight of 551 lb.

A gearbox of this type was shown an-41in. Mercedes Benz rear-engined chassis exhibited at the Frankfort show, , .

in April, 1931.

Tags

People: Mercedes Benz
Locations: Fricdrichshafen

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