To search, type and hit enter.

VEHICLE TRANSMISSIONS

HeavyTorque Issue Five: Vehicle Transmissions

LAYING DOWN THE POWER

TRUCK TRANSMISSIONS HAVE SEEN PROBABLY MORE CHANGE IN THE LAST TWENTY YEARS THAN EVEN ENGINES, AND THAT’S ALLOWING FOR THE TURMOIL CREATED BY SUCCESSIVE EURO EMISSIONS STANDARDS. WE LOOK AT THE BIG DRIVELINE CHANGES, AND ASK A MAJOR MANUFACTURER OF FULLY AUTOMATIC TRANSMISSIONS, ALLISON, HOW THEY ARE WEATHERING THE STORM. IAN NORWELL REPORTS.

The unrivalled march of transmission innovations over the last twenty years has left the old traditional ratio changers in the shade. They’ve certainly marginalized the eight, twelve and sixteen-speed manual boxes. The range-change four-over-four (with or without splitter) was the industry staple not that long ago. To find one now, you’d best drop in on a vintage truck show. When electronics took over from plain electrical, the writing was already on the wall – for those with eyes to read it. Getting conventional gearboxes, engines, and clutches to talk to each other without bothering the driver, brought us the AMT (automated manual transmission). A big advantage here was the use of existing (and proven) major components. In fact, the smoothness and accuracy of shifting allowed many to dump the weight and complexity of synchromesh, previously essential when shifts were managed by clutch-and-boot. But they weren’t at the party long before other devices, adding more functionality, turned up. Cruise control, and his smarter brothers, adaptive and predictive, have changed truck driving forever. A recent excursion with Mandy Wannerton, DAF’s driver-training manager, showed the now ‘normal’ level of automation. Mandy commented: “You drive a truck more with your hands and fingers these days, than with your feet.” She’s right. Playing tunes on the steering-wheel-switches which control these devices, and adjusting the over and under-speed as required, is a far cry from stirring a stick in a crunchy box of cogs. So much for the manual box, its coffin seemingly coach-bolted down. The automated box has moved in to stay, but what about the automatic? That smooth, fluid-coupling torque-converter? Well, no surprise, that’s not been idle either.

WOULD YOU LIKE TO CONTINUE READING THIS ARTICLE ON VEHICLE TRANSMISSION?

This article is premium content, so you must register and pay to continue reading. You can read individual articles from any issue of the magazine by clicking here and paying just 0.99p. Or you can buy a subscription to HeavyTorque magazine from just £32.00 a year (UK), giving you unlimited access to all the features online, as well as receiving the full magazine by post four times a year.

Kick back, relax and enjoy the read!

Announcement

HeavyTorque White Logo

It is with regret, that the HeavyTorque team have decided to take a stand based on an industry-wide ‘blind eye’ to the waste in the magazine and periodicals business.

HeavyTorque (#15, July 2018) was the final issue to grace the shop shelves, both on the High Street and across the travel network. As part of our onward strategy to adapt, HeavyTorque will now be distributed exclusively through controlled circulation and available through printed subscription.

Please note, this change will only affect newsstand purchasers. There will be no change for our loyal print subscribers.

Why the newsstand change? Quite simply, we can no longer (in good conscience) participate in a distribution programme that creates such an inherent waste of our precious natural resources – and money.

For those of you who have enjoyed HeavyTorque from the newsstand, we sincerely appreciate your business – and we would hope that you’ve enjoyed the magazine enough to consider a direct subscription?

Single Issues

If you prefer to purchase individual issues (one at a time), you will still have the ability to do so, both online (via the website), or by calling our offices +44 (0) 1572 3450872. Orders for single issues received before the pre-publication deadline will be mailed along with the subscribers.

Current and Back Issues

Our website also caters for those looking to purchase back issues. To browse Back Issue availability, follow this link: https://www.heavytorque.co.uk/shop/

Annual Subscription (UK/Europe and Rest of the World)

Never miss a beat, and keep up with every issue of the magazine via an annual subscription. To purchase your annual subscription, please visit: https://www.heavytorque.co.uk/subscribe/

It remains our objective, philosophy, and goal to provide our readers with the best content available, together with stunning feature photography. We do hope you will continue to support our venture!