Big gearbox design

wrote:
  Quoted Text Here  

Be a royal bitch if it sprung an oil leak!!! They were also "multi speed" geared transmissions - running on the short lines in the UK I guess they stood up OK,but I doubt they would have lasted long on our transcontinrntals and hauling freight through the North American Rockies, or even the appalachians with trains several miles long.

snipped-for-privacy@snyder.on.ca writes:
  Quoted Text Here  
On huge transcontinental railways you are not limited for loco size - so you would not use the hydro-mechanical design to pack a lot of punch in a small light loco.

  Quoted Text Here  
http://www.victorianweb.org/technology/railways/23.html The different conditions here affected engineering practice, for example we didn't have an abundance of skilled labor while the frontier was open, so Americans built locos with exposed plumbing and outside cylinders that were easier to maintain. -jsw

On Thu, 17 Aug 2017 19:52:19 -0700 (PDT), Christopher Tidy
  Quoted Text Here  
There is no clutch on the usual a diesel-electric drive. Just an rheostat to control the electricity going to the motor(s). A diesel-electric vehicle often has a number of motors.
  Quoted Text Here  
The motor torque is normally applied directly to the driven wheel.
  Quoted Text Here  

On Wednesday, August 16, 2017 at 4:52:01 PM UTC-4, snipped-for-privacy@sbcglobal.net wrote:
  Quoted Text Here  
The engine block always need antifreeze.

Christopher Tidy wrote:
  Quoted Text Here  
On locomotives you need some means to connect an engine doing and requiring a couple of hundreds revs/min to wheels doing zero revs/min with some hundreds of kilonewtons drawbar power when taking off.

Ships of all sizes use them, Oil services use them some gears are so large that they have to be on 80' heavy duty trailers mounted on an angle so the width would fit in 1 or 2 lanes and still under mandatory overpasses. Lufkin Industries here in town before being bought out by GE used to move some rather large gears to be used world wide.
They had a gear box group that still works here - 'black magic' you don't mess with in the works. Large industrial air handlers and mills.... the gear boxes have to be designed right considering many parameters that are often ignored until the box blows up.
Martin
On 8/16/2017 1:47 AM, Christopher Tidy wrote:
  Quoted Text Here