Valtra Oy Ab

Timo Ruokola

Ville Viitasalo

A multi-ratio PTO drive system is provided and having a first shaft drivingly coupled to a second shaft between an engine output and a splined PTO output stub by a plurality of selectable gear sets. Each gear set delivers a different input-to-output drive ratio and comprises at least a pair of gears drivingly coupled to one another. A first gear of each gear set is keyed on the first shaft and a second gear is selectively engageable with the second shaft by a respective selector mechanism. Each selector mechanism is hydraulically activated by pressurized fluid conveyed through respective fluid conveyance bores in the second shaft. The selector mechanisms may comprise respective coupling gears that are slidable on the second shaft between non-engaged and engaged positions. The coupling gears may serve as pistons within a chamber that can be pressurized wherein the pressurized fluid acts thereupon.

Multi-ratio power takeoff drive for agricultural tractor

There is provided transmission module () for a tractor which is selectively configurable between a CVT arrangement and a multi-ratio powershift transmission arrangement. The module comprises an epicyclic unit () in which a first gear element of the epicyclic is driven mechanically from the input shaft () and a second gear element of the epicyclic acts as an output of the transmission module. By simply connecting either a CVT unit () or a pair of clutches () between the input shaft and a third gear element the module () can be converted to the desired transmission arrangement. This delivers benefits in a factory for example whereby a large proportion of the assembly can be completed before tailoring the transmission to a customers requirements, thus reducing lead times on delivery.

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Suolahti, Finland

Timo Ruokola