Modern Quarrying Q2 2019

LOADING – WHEEL LOADERS

New developments As technological development

continues apace, Volvo CE now uses its Optishift in the large wheel loader range, from the L150H to L260H. The patented Optishift includes two items: firstly the lock-up function and, secondly, the Reverse-by- Braking technology. Volvo CE has improved the lock-up shifting strat- egy when no throttle is applied. The lock-up function is available even in first gear – this is a big benefit in dozing applications. Furthermore, you have a selectable automatic lock-up function between 2 nd -4 th , 3 rd -4 th or 4 th gear. “The Reverse-by- Braking control and response have also been improved. The large number of upgrades, improvements and new features continue to make the Volvo-developed Optishift the best in the industry, contributing to an overall 15% improvement in fuel efficiency,” says Schmitt. Speaking about some of the possible future developments in wheel loader drivelines, McNeill believes that more focus will be on gear shift improvements, torque convertor optimisation with lock up, as well as the development of engine torque vs. efficiency. Schmitt says today electro-mobility is in everybody’s mind. He is of the view that in future we will see more driveline components being replaced by electrical actuators – for example, transmission and propeller shafts will be replaced by electro motors at the axle hubs. “Efficient electrical actuators will allow us to downsize the engine, as we will have no power losses anymore in the driveline or the diesel engine gets completely replaced by batteries. But we are not there yet and it will take a few more years before we have sufficient, long lasting batteries and reliable off-road components,” concludes Schmitt. l

The Bell E series range of wheel loaders is driven by a mechanical drivetrain.

Volvo CE believes that in future we will see more driveline components being replaced by electrical actuators.

A key benefit of Bell’s mechanical drive is the provision of high end torque at the wheels and its simplicity to maintain.

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MODERN QUARRYING QUARTER 2 - 2019