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Old 06-07-2009, 05:27 PM   #1
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Default Bellcrank vs. Direct Steering

So what do you see as being the pros and cons between bellcrank steering and direct steering? Touring car designers seem to put a lot of effort into optimizing the bellcrank assembly, while pan cars do just fine without it.

Here's what I can see as the advantages of each:

Bellcrank:
adjustability
tunability
better bump-steer characteristics

Direct:
simplicity

It probably comes down to the bump steer issue, which would affect TCs much more than pan cars due to the far greater suspension travel.
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Old 06-07-2009, 06:52 PM   #2
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Another thing I could think of is space. There could be not enough space for current TC designs to fit a direct/mono crank steering. But if you remember, the first X-ray TC that ever came out had mono-crank steering.
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Old 06-07-2009, 07:10 PM   #3
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It would be hard to fit a belt through the center of the chassis with a servo in the way.


Most bellcrank designs are very simple, but allow more tunability than a direct linked method as well.
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Old 06-07-2009, 09:34 PM   #4
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Quote:
Originally Posted by TimV View Post
It would be hard to fit a belt through the center of the chassis with a servo in the way.
Good point.
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Old 06-08-2009, 12:17 AM   #5
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is it bellcrank is ankerman ?
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Old 06-08-2009, 06:51 AM   #6
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Quote:
Originally Posted by kschu View Post
is it bellcrank is ankerman ?
No, you still have Ackerman effect with either type of steering. The Ackerman is determined by the geometry of the steering knuckle.
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Old 06-08-2009, 08:41 AM   #7
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I vote belcrank, primarily for adjustments. I run a custom made central ackerman that allows about 50 different settings (front/back and side to side) because my car only has one at the knuckle and thats before you shim anything.

Pan cars have direct, the best part is that you don't have the 0.01mm of slop per ball joint that touring cars end up with.
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