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Old 14-06-2013, 05:20 PM
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Lightbulb Appearance of the Fulltime 4WD One-Box Domingo GX

The fulltime 4WD Domingo GX that went on sale in August 1986 adopted a free-running fulltime 4WD system that used a one-way clutch. After that, when the model was changed to the second generation Domingo in 1994, ECVT was introduced and the system was changed to viscous fulltime 4WD. Having tried various 4WD mechanisms, just what was the free-running fulltime 4WD that Subaru came up with? The following reproduced article gives an idea of the mechanism.

Appearance of the Fulltime 4WD One-Box Domingo GX

The long-awaited fulltime 4WD model “GX” has now joined the Domingo series. Combining a quiet and powerful 1.2 liter OHC engine and the unique Subaru free-running fulltime 4WD system, this car lets you enjoy easy and safe 4WD driving.

The smooth and powerful running of the free-running fulltime 4WD is made possible by the one-way clutch inside the transfer case. One-way clutch is a mechanism that conveys power in one direction only, and this clutch absorbs the rotating differential between the front wheels and the rear wheels.

The engine power is conveyed to the rear wheels from the transmission, and at the same time it is conveyed to the one-way clutch inside the transfer case. When running straight, the front wheels and rear wheels rotate at the same speed, and the engine power is also conveyed to the front wheels via the one-way clutch so all four wheels are driven. In this state, the front wheels and rear wheels are directly linked so the drive force of 4WD is fully exhibited. During cornering at low speeds, because the front wheel tracks pass outside of the rear wheel tracks, the front wheels sometimes turn faster than the rear wheels. In this state, free running of the one-way clutch temporarily separates the front and rear wheels and there is no tight cornering.

The free-running fulltime 4WD displays the excellent running characteristics of coupled 4WD and enables safe running on slippery surfaces such as snowy roads, mud, sand and grassland. Furthermore, when running on very slippery frozen roads and compacted snow roads, a “snow switch” is provided for drivers who are not accustomed to snow driving. By turning the dashboard switch to the “SNOW” position, the one-way clutch is mechanically locked in the coupled 4WD state, thereby enabling more definite running.

Operation of the one-way clutch generates no vibration, shock or noise at all. Drivers can enjoy the smooth and powerful running of 4WD simply by conducting the usual operations and without worrying about switch and lever operations. This mechanism is simple and compact and has excellent durability and reliability.

(Extracted from Cartopia Vol.171, issued in September 1986)

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