HANNOVER MESSE 2020, 20 - 24 April
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HYDAC Proportional Valve technique in high performance transmission

Logo Hydac International


Hydac International

Exhibitor details
Exhibitor details
Logo HYDAC Proportional Valve technique in high performance transmission

Product description

The gear technology in mobile working machines is more and more changing. Simple mechanical gears were exchanged by automatized, stepless gears. This trend towards automation requires appropriate hydraulic components. HYDAC hydraulic valves and customized manifolds are guaranteeing reliable, standardized procedures to relieve the driver of the machine.The different types of gears are varying from automated, mechanical, continuously variable transmission to power shift versions. They are equipped with clutches that switch different gear ratios. These valves are controlled by means of hydraulic oil. The requirements for filling- volume, time and leakage are decisive for the performance of the valves.Certain basic circuits could be realized by HYDAC solenoid spool valves, which on top of that have a high switching safety e.g.:- switching on/off the 4WD- switching on/off the differential pawl- change of driving direction (forward/backwards)For the realisation of a power shift transmission these valves are not sufficient. Here HYDAC proportional pressure reducing valves are used which enable a smooth shifting of gears under load. Whereas the momentarily working valve is lowering the pressure on the clutch of the corresponding gear-wheel the valve for the following gear is increasing the pressure more and more. So the main gear switching is done without traction interrupt and nearly without notice of the operator. These proportional valves are especially designed for the use in clutch control and have a fast reaction and high draining and filling volume potential and an extremely low p.Furthermore these high-specialised manifolds could fulfil additional functions, such asmonitoring of the supply pressure at the gear and brake switching of gear brake.HYDAC Fluidtechnik has intensified research and development in the field of proportional gear controls and is now the most competent partner for demands of the gear branch.

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