|Posted on Wednesday, February 23, 2005 - 10:53 pm: |
I dont argue with your description of tank steering.
The system i describe was designed for tanks in the early eighties as far as i know and was designed with tanks in mind.
It can be considered as the final drive and can be driven by any form or variable or multi ratio transmission. as for the steering aspect this system relies on both diffs being coupled.
1:1 on one side and 1:-1 on the other.
One is driven the other sums the left and right axle speeds. The input to the second diff determines the steering action. locked it steers straight (full all wheel drive on an aatv) any input forces a difference in axle speeds and causes a turn the rate of turn is dependant on the speed of both the drive and the steering input.
This is why hydralic drive is a good choice as flow rate can be controlled and tends to track engine speed.Also this system eliminates entirely the need for steering brakes which turn valuable engine power to waste heat, a loss that a tank can not afford given the overheads it must cope with such as armour etc. I have written at length on this system in this forum on two other occasions. just search on my name to find the other posts.