The YOX constant-fill fluid coupling is fitted between the motor and the driven machine to give a soft, load-free start on belt conveyors, crushers, fans and mixers. Sizes from 280 to 650 mm cover a wide power band; the coupling transmits torque through oil rather than mechanical contact, so the motor reaches speed before the load accelerates and the belt, gearbox and motor are protected from start-up shock.
On a loaded conveyor this matters: without a coupling the motor must break the full static load, which drives up motor frame size, belt tension and gearbox rating. With a fluid coupling the acceleration is gradual and controllable, the starting current peak is shortened, and on multi-drive conveyors several motors share the load more evenly. Under sustained stall the coupling slips and limits transmitted torque, protecting the drive train from damage until the condition clears.
We size the coupling from motor power, input speed, load inertia and start frequency, then confirm the oil fill quantity and oil grade against the duty — the fill determines the torque capacity and the slip behaviour, so it is a selection parameter rather than a fixed quantity. Shaft bores, keyways, mounting orientation and the connection to the gearbox or pulley are confirmed before release.
Each unit is supplied with the specified fill, run-tested and packed with the required seals and fusible plugs. We regularly consolidate couplings with gearboxes, backstops, pulleys and conveyor chain into one shipment for a complete drive package. Lead time is confirmed against the configuration at quotation.
Send us your motor power and speed, driven-machine inertia, start frequency and shaft dimensions. We will size the YOX frame, specify the fill and return a complete selection with a quotation.
