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Porsche Synchromesh in D.B. Gearbox

28th December 1956
Page 32
Page 32, 28th December 1956 — Porsche Synchromesh in D.B. Gearbox
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A SYNCHROMESH mechanism 1.6

Porsche designs is employed in the latest commercial-vehicle unit produced by the automobile gearbox division of David Brown, Ltd., at Parks Works, Huddersfield. The new model, which has five forward speeds and reverse, is known as the S.550. All gears are in constant mesh and all forward speeds, excluding the first, are synchronized.

• The components employed arc notably compact, so that the weight and overall dimensions do not exceed those of normal boxes of similar capacity. A self-energizing action, which is a feature at' the Porsche design, is stated to reduce manual effort, at the same time ensuring a fast and easy change.

When the first David Brown S.550 was completed at Huddersfield. it was sent to the Porsche factory in Germany for confirmation of the standards set up.

The S.550 is designed for a maximum input torque of 300 lb.-ft. For vehicles up to 20 tons gross there is a heavy-duty direct-top model having ratios of 7.81, 4.86, 2.76, 1.596 and 1.1 forwai.d, and 8.03 to I reverse. An overspeed-top type is available for coaches and the lighter, higher-speed goods vehicles. In this case the ratios are 6.28, 3.385, 1.83, 1.1 and 0.80 to 1. with a 6.44 to 1 reverse.


THREE tractors and a 24-wheeled I trailer were used by the Birtley depot of Pickford's Heavy Haulage Service last week when a 165-ton twin transformer was moved from the Heaton works of C. A. Parsons and Co., Ltd., to the new Cambois power station at Blyth. A 30-mile route had to be covered, although the two points are only 12 miles apart. Stannington bridge over the river Blyth had 10 be strengthened.


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