Tank suspension systems?
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Tank suspension systems?
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why do bull dozers and other heavy tracked machinery use different looking suspension with tiny bogies and how do they work compared to Tank suspension.Do smaller bogies (like Churchill tank) help over rough ground but effect the speed compared to a tank like the Cromwell.Is that true or are idler an driven wheel sizes or final drive systems more important than bogie sizes. I know about track widths like advantages over soft ground but not much about what I've asked, please help CHEERS Big John.
For the first answer I am impressed with your knowledgeable answer, however it's probably my fault for the way I asked the question. I knew everything you stated bar the plans for the T34m torsion bar suspension. More what I wanted to know is does different size (not width) bogies effect the speed that a tank can travel, does a larger wheel change the speed or just make it easier to travel at quicker speeds. Does smaller bogies travel better at slower speeds trough rougher conditions and is this why they are used on bull dozers and other slower tanks such as the Churchill and Matilda. Was the Churchill tank's ability to climb hills more down to shape and length of vehicle rather than suspension used. These are more of the questions I wanted to know but thank you for your help, Cheers B John
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Mark F
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The Churchill heavy tank of WWII as a bit of a throwback to WWI tactical thinking (and looked it). It was a long, slow tank designed to cross very rough, uneven ground and trenches. For higher speeds, such as those required for "breakout" operations (cruiser tanks in British speak) something rather different was required.
The independent suspension developed by J Walter Christie in the 1920's had conspicuous success on cruiser type tanks in the 1930's and throughout WWII, though it was largely dispensed with post-war. The large, independently coil sprung road wheels offered a relatively smooth ride over rough terrain and low ground pressure for good mobility at high speed. This system was most famously employed on the Soviet T-34 and the British cruisers up to and including the Centuar, Cromwell and Comet.
By 1941 the Soviets had discovered that an independent torsion bar suspension offered advantages over the Christie type and were ready to produce a new T-34 derivatie, the T-34M incorporating this type of suspension when the German invasion of June 1941 killed those plans.
During 1942 the U.S. developed the T-20 series of medium tanks as replacements for the M4 Sherman. Numerious prototypes were trialed using various suspension types from the Sherman's proven Vertical Volute Suspension double-bogie type with three pairs of wheels on each side sprung together to an improved Horizontal Volute Suspension with wider track to a fully independent torsion bar suspension. The torsion bar system proved to offer a much better ride and more importantly, 20% lower ground pressure and better weight distribution. Torsion bar suspensions appeared late in the war on the extremely fast M18 Hellcat tank destroyer, the M24 Chaffee light tank and the M26 Heavy (medium) tank. It has been used on every American tank since and is pretty much the standard still used on most tanks today.
***EDIT****
Bogie size is connected to gear ratio, just as overall tire diameter is connected to gear ratio on a car. You can't make blanket statements about it without considering the entire drivetrain. |
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