On-de­mand FWD for Euro DAFs

New Zealand Truck & Driver - - Front Page -

AN AU­TO­MAT­I­CALLY-EN­GAGED PART-TIME front-wheel-drive sys­tem is now be­ing of­fered in Europe on DAF CF and XF 4x2 trac­tor units.

DAF Trucks will also add the switch­able front-drive to other chas­sis con­fig­u­ra­tions in Europe later this year.

It says that the hy­draulic front-wheel-drive sys­tem is de­signed for “trucks that clock up most of their mileage on the road, but are some­times re­quired to drive of­froad or in slip­pery con­di­tions.”

The new PXP (Paul Ex­tra Power) drive has been de­vel­oped in league with Ger­man spe­cial ve­hi­cle con­ver­sion op­er­a­tion Paul Nutz­fahrzeuge. It’s avail­able in Europe on DAF trac­tor units pow­ered by ei­ther the PACCAR MX-11 or MX-13 en­gines.

DAF points out that per­ma­nent all-wheel-drive for only oc­ca­sional use “means a con­sid­er­able cost in terms of ac­qui­si­tion, main­te­nance and fuel con­sump­tion.

“How­ever, it is some­times very im­por­tant to have ex­tra trac­tion to tackle ditches, sandy roads, un­paved tip-sites and steep in­clines.”

A switch on the dash­board puts the switch­able drive on standby in po­ten­tially tricky sit­u­a­tions. If the ve­hi­cle then ex­pe­ri­ences slip from the pow­ered wheels, PXP is au­to­mat­i­cally ac­ti­vated. The greater the amount of rear-wheel slip, the more trac­tion the front wheels pro­vide.

The sys­tem is avail­able in the first four for­ward gears and the first and sec­ond re­v­erse gears. At speeds above 20km/h (and/or in 5th gear or higher) PXP switches back to standby mode. The sys­tem ac­ti­vates it­self again at lower speeds and when­ever use is re­quired.

To make the switch­able FWD pos­si­ble, each front axle wheel hub is equipped with a hy­draulic mo­tor, pro­duc­ing torque of 6435Nm or more at a max­i­mum sys­tem pres­sure of 360 bar. This en­sures op­ti­mal per­for­mance and op­ti­mal longevity and re­li­a­bil­ity.

A unique fea­ture is that the mo­tors are driven by a hy­draulic pump fit­ted di­rectly onto the en­gine PTO, sav­ing both weight and space. The hy­draulic pump can also drive com­po­nents like cranes, hook arms, sta­bilis­ers or skip loader sys­tems for max­i­mum ef­fi­ciency. This means that only one hy­draulic tank is re­quired, which also re­sults in less weight and more space.

The PXP sys­tem demon­strates DAF’s abil­ity to pro­vide op­ti­mal so­lu­tions for ev­ery trans­port re­quire­ment, it says.


The front-wheel-drive au­to­mat­i­cally en­gages when any rear wheel slip­page is de­tected

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