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Future pointers to tipping gear design

15th May 1982, Page 26
15th May 1982
Page 26
Page 26, 15th May 1982 — Future pointers to tipping gear design
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ram positions, there are advantages and disadvantages to both types.

At one stage, Edbro was 100 per cent bore seal, but because of the different demands of some of the company's world markets, a significant part of the production was changed to outside sealing. When home and export markets began to overlap, the UK specification was changed to the displacement seal on trailers and eightwheelers. According to Martin Orm rod, the UK is now 70/30 bore/displacement sealing in round figures with the non-UK figures being the other way round. Part of the reason for choice in this area is tradition. Canada, Australia and the UK are about the only countries who have ever usec., the bore sealing type.

Edbro believes that from a technical point of view the operator is not interested in the method of construction, merely in how effective and reliable the tipping gear is in service.

The big advantage of the bore seal type is that it can lift more load (about 15 per cent) than the displacement type for a given pressure. John Worton-Griffiths claims that it is more durable and rugged in the sense that the sealing surfaces are never exposed which is a useful point when operating in abrasive areas.

As John explained: "The clever thing about tipping gear design is keeping it as simple and hence as cost effective as possible. There is absolutely no point in going to aircraft-type hydraulics to do our job."

Edbro is looking at spending more time and money on bore seal development. The aim is to produce a bore sealer which will satisfy the needs of the displacement user, with its cleaner operation, and will have a longer seal life and a greater lifting capability.

Because the two types have slightly different performance characteristics (for example, the bore seal can lift more but less

quickly because of a greater capacity) Edbro rates the pr ducts so that they genera the same thrust. The ultimate r quirement is a mechanical or based on the stresses in the c, lumn. Thus, Edbro gives a ratir based on column length and n on lifting capability.

For the chassis, Edbro predicting a gradual parting the ways between tipper ar general chassis designs. Joh Worton-Griffiths explained th, "an awful lot of effort goes in designing a vehicle for road ui whereas the greater stre! occurs during tipper operation.

Tippers, of course, are al: subject to shock loading in a wi that haulage chassis nevi should be.

Both Messrs Ormrod and Wc ton-Griffiths feel very strong that there should be a move t wards a pure tipper chase rather than an adopted gener purpose one.

"The effort and resources p in by the (chassis) manufacti. ers could make it a more ef cient tipper, not just an efficie chassis. Otherwise we can finii up with something that is n what either of us requires."


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