How do diesel-hydraulic locomotives work?

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Ben1337

Trainz operator
 
At the risk of being too simplistic:

A diesel electric loco uses the diesel engine to generate electricity to drive electric motors which move the loco.

A diesel hydraulic loco uses the diesel engine to drive pumps which force hydraulic fluid over impellors which turn shafts which move the loco.

If you have ever seen the sails on a windmill turning because of the wind, or have ever blown through a fan to make it turn ........then it imagine what a high pressure blast of fluid would do in the same scenario.

Regards. Colin.
 
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origonally, I thought the diesel engine drove a gearbox, which turned a Bent axis pump which fed oil through tubes into another bent axis pump in the bogeys which drove the wheels.

But, I read somewhere that they used a torque converter in locomotives.

more information about the torque converter: The torque converter is mainly found in automatic cars to act as a replacement for the clutch that are found in cars with a manual transmission.

The torque converter is basically one fan pushing oil round, turning the other fan around which turns the shaft, similer to what Driver_Col mentioned.
 
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The BR 'Warship' & 'Western' classes had an arrangement where the engine drove a gearbox via torque coverters, the gearbox then drove the axles by means of carden shafts to the final drive gears on the axles.

There are some very detailed drawings in a book titled "British Locomotives of the 20th Century" (volume 3) by O.S.Nock
 
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