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Anglo

10th September 1971
Page 36
Page 36, 10th September 1971 — Anglo
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German venture doubles Unimog payload

• Daimler-Benz A.G. and Primrose Third Axle Co Ltd, have co-operated to produce a six-wheeled edition of the Mercedes-Benz Unimog four-wheel-drive 3-ton truck. As a six-wheeler its payload is doubled to 6 tons; its platform area is increased by 3ft 9in. to lift 2in.

The axle added by Primrose is not driven—four-wheel drive is considered adequate, especially as the differentials of the Unimog's driving axles can be locked. However, the third axle is self-steering and thus reduces tyre scrub when turning. The third axle is located fore and aft by a torque tube in much the same way as the driving axle is located. This torque tube also resists twist from brake reaction. Transverse location is provided by a Panhard rod. No lubrication is needed at any joint.

The Primrose self-steering axle has brakes 5in, wide and 12-1-in. in diameter. They are two-leading shoe Girling wedge-expanded units with compressed-air actuators mounted directly on the backplates.

Much effort, says Primrose, has gone into getting torsional strength into the section of chassis spanning the rear bogie and in getting an even spread of stresses from the equalizing-beam pivots of the suspension.

Two tubular cross-members form a welded sub-assembly with long end plates of w3in thick steel. This is bolted inside the chassis, spanning the bogie. Then another, larger diameter, tubular cross-member is bolted across the chassis bridging the equalizer-beam pivots. So there are three tubular cross-members to absorb torsional stresses from the rear bogie. Besides this, the chassis frame is flitched on the outside. The complete Unimog six-wheeler weighs 3.75tons; Overall length is just over 18ft.

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