You can start by visiting their website at

http://www.voithturbo.com/fluid-coup...re.php3?id=746

and then reviewing the many PDF files and information they have to offer.

Good luck

Gary Blenkhorn ■

Dear Mr. Young Engineer,

You have to give presentation on fluid coupling, so option is you may visit technical library and get literature on the subject or you may obtain the published literature of the manufacturers of fluid coupling. This you can use to prepare your presentation.

The fluid coupling is a big subject with intricate engineering issues and I doubt whether anybody can describe this on forum.

Regards,

Ishwar G Mulani.

Author of Book : Engineering Science and Application Design for Belt Conveyors.

Author of Book : Belt Feeder Design and Hopper Bin Silo

Advisor / Consultant for Bulk Material Handling System & Issues.

Email : parimul@pn2.vsnl.net.in

Tel.: 0091 (0)20 25882916 ■

Dear Young Engineer,

Nobody knows what you are talking about regarding Voith gear ratios. Voith used to make reducers. They got out of the business many years ago.

The fluid coupling has nothing to do with gear boxes and gear rations. The fluid coupling is a clutch device that varies (regulates) the motor's torque over time during the acceleration phase of the conveyor belt. The Voith coupling is a device that gradually increases belt speed to match motor speed by the shearing of fluid between two impellers. The two impellers are configured with one halve connected to the motor output shaft and the other halve connected to the reducer high speed shaft. The two impellers are connected, in speed, by shear the oil that revolves in a torodial motion as it circulates between the two halves. Voith has diagrams to demonstrate this action as has been noted by others.

What the buckets is E&P? ■

Your imagination of gears are really vanes. First, imagine a big hollow donut which we call a torus. Cut the donut in half 90 degrees to its axis of revolution. Imagine the two halves are identical. Futher imagine placing radial spokes or vanes at regular intervals about this axis of rotation. Remember they have been cut in two. Imagine there is oil filling the two halves to about 50% of the volume within the torus. The oil is captured between the vanes.

The motor, connected to one half, starts to accelerate and rotate faster and faster. During this speed up of one half, the oil contained in this rotating half is moved both by the rotation of the motor in the direction of spin, but also across the gap between the two coupling (torus) halves at 90 degrees to the axis of spin.

The reducer coupling half is initially at rest, and does not move without a motoring force.

The motor side coupling provides the motoring or spin force. The oil in its chambers, between the vanes, begins to be moved by the rotational centrifical force as the oil is pushed along the outside of the torus at 90 degrees to the axis of spin. As oil crosses the gap, at the outer diamter between coupling halves, the oil is sheared by the stationary gear reducer side coupling half. THe sheared oil produces the torque to move the conveyor through the reducer. The oil is slowed down from the shearing action, where the centrifical force keeps the oil along the torus outer surface, till it moves to the gap at the bottom of the torus. There it again enters a shear zone and passes back into the motor side where the process repeats itself.

I am sure there are better descriptions of this process written. You need to obtain a grasp of the concept by doing a little more reading.

I do wish you well. This is difficult to easily explain in few words. There may be a good analogy but it does not come to mind at this moment. I also believe the Voith website has an animation you should download and play. Then my words will have more understanding to an engineer. ■