Control these power flows allows the driver to change speed and steer left or right. The dual-flow principle itself came up even earlier than the tank. The Vedovelli Priestley electric taxi equipped with double differential steering system, is capable of neutral steering. The Char B1 tank's dual-flow principle is quite simple. Henry Edward Merritt, an engineer and gearbox designer, is famous for his unique invention, Merritt triple differential transmission.
The first British mass production tank with triple differential transmission is the Churchill tank. The Churchill tanks have a Merritt-Brown H4 gearbox, 4 stands for four gears forward, H stands for horizontal, because the two rows of gears in the gearbox are horizontally located. A great advantage of Merritt's design is compactness. The transmission incorporate the range gears and steering mechanism into a single box, thus reduce the longitude size.
The H4 transmission can provide four gears forward, one gear reverse, and a neutral position for neutral steer. The basic design itself is simple, but how to explain it could be a little bit difficult.
Three differentials are arranged like this:. The left and right differentials are used for combining the driving power flow and steering power flow, and the steering differential is used for creating different speed of the steering gears.
The bevel pinion gears are not easy to produce, so the design transformed into cylindrical gears. When driving forward, the sun wheel and ring gear of planetary F1 and F2 always counter rotate. The carrier of F1 and F2 rotate on an average speed of the ring gear forward and the sun wheel reverse , and because the ring gear rotates faster, the carrier rotates on the same direction with the ring gear, so the vehicle goes forward.
When steering brake J1 actuated, the sun wheel of F1 is stopped, now the carrier of F1 accelerate. The steering differential C then drives the sun wheel of F2 back rotate even faster double time , so the carrier of F2 decelerate. When reverse gear is selected, the main shaft E of the gearbox is locked and stopped. This design has advantages and disadvanteges. The advantage is that the gearbox doesn't need to insert a idler wheel between range gears to change the driving direction, thus ease the operation of gear changing.
The disadvantage is that the reverse gear is very slow, due to the large reduction ratio. The reverse gear ratio of Z5 gearbox is approximately When the vehicle is stopped on a solid plain terrain, and neutral position is selected, the planetary carrier stay still. The sun wheels go reverse, bring the ring gear and main shaft rotates forward.
Pull left steering lever, right sun wheel is stopped and forward-rotating ring gear bring the planetary carrier slowly forward, so the right track goes forward. The left sun wheel reverse double-time and faster than forward-rotating ring gear, bring the planetary carrier slowly reverse, thus the vehicle pivot in place. The US CD is another instance for triple differential steering system. On the British Merritt-Brown, when the vehicle goes forward, the sun wheel and ring gear of the planetary always counter rotate.
On CD, when the vehicle goes forward, the sun wheel and ring gear rotate toward the same direction. The neutral steering of CD is similar to the Merritt-Brown system. Nicholas Noran a. You can post now and register later. If you have an account, sign in now to post with your account.
Paste as plain text instead. Only 75 emoji are allowed. Display as a link instead. Clear editor. Upload or insert images from URL. Share More sharing options This can be used on lighter tanks, but the amount of kinetic energy in larger tanks makes the required brakes impractically large. Acceleration, rate at which velocity changes with time, in terms of both speed and direction.
A point or an object moving in a straight line is accelerated if it speeds up or slows down. Motion on a circle is accelerated even if the speed is constant, because the direction is continually changing. Differential steering is the primary means of steering tracked vehicles, such as tanks and bulldozers, is also used in certain wheeled vehicles commonly known as skid-steer, and even implemented in some automobiles, where it is called torque vectoring, to augment steering by changing wheel direction relative to the ….
A tank is like a bulldozer. If you want it to go forward, you push two levers forward, if you want to go right, you push the left lever forward and the right lever backwards much like driving a skid steer. To go in reverse you would pull both levers backwards. A tank without tracks would get stuck in anything but firm concrete.. Your idea would only be feasible in small tanks on the under 25 ton range. You do not need a permit. You do not need a license. Modern tanks are air tight, and pulls the air from the outside through a filter system, but also a AC system as well.
They are also designed to be over pressurized, so if any way for air to pass through armor exist, the air is always goes from the inside of the tank out.
Tanks cannot move in all 6 directions. In order to steer, most tanks decelerate the right or left tracks, while keeping the other tracks spinning steering is thus a breaking job, rather than a steering job unlike in a car.
An object which moves in the positive direction has a positive velocity. If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion in this case, a negative acceleration.
When an object is speeding up, the acceleration is in the same direction as the velocity. Thus, this object has a positive acceleration.
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