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Old 01-18-2011, 07:23 PM   #1
timboslice
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What is the purpose of Suspension Linkage?

What is the purpose of suspension linkage as opposed to just mounting the shock directly onto the swingarm?
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Old 01-18-2011, 07:24 PM   #2
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has to be able to move and articulate. it isn't a up and down process like a car
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Old 01-18-2011, 07:27 PM   #3
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i don't think thats accurate, i have seen many bikes with them mounted directly to the swingarm. Alot of cruisers still do it to date.
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Old 01-18-2011, 07:29 PM   #4
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that's true, and those old relic suspensions are not as responsive as modern suspensions with a pivot gliding on needle bearing to reduce friction. plus, since the shock is mounted so far forward, it helps offset the increased pressure from the leverage.
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Old 01-18-2011, 07:37 PM   #5
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Ok thats closer to what i was thinking. It makes sense to me that the high pressure distributed across 6 bearings instead of 1 would give way to smoother operation, but they could do that with a simple cantilever set up. The setup commonly used on streetbikes is quite a bit more complicated and also seems to create a rising rate, or just a straight ratio rate thats greater than 1:1.
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Old 01-19-2011, 11:39 AM   #6
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Linkage allows the mfr. to tune the suspension by making the linkage progressive as opposed to basically a straight rate on one mounted directly.
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Old 01-19-2011, 09:46 PM   #7
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"How exactly does the posi-trac rear end on a Plymouth work!?
It just does. It just does."
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Old 01-19-2011, 10:59 PM   #8
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Again I go with Patricks explanation.

But long ago they did not have shocks like today.
Origianlly the shocks went almost directly up and down mounted near the rear axle.

As shocks improved they could move them forward on the swing arm achiving more or same travel with a shorter shock.

Better shocks and then could lay them down, another imrovement in travel.

Arrives - the Forward mount lay down shocks. the way to go until a better shock could go Mono ( 1 Shock)

Add some linkage improves the travel and allows adjustment.

<>

Plymonth posi had two designs
A clutch spring set up prior to 1970
and after 1970 the limit slip desogn which instead of clutches used a Cone/dish and tapered cylinder which would mate into the Cone with a helical like gear pattern on the Tapered cylinder.

To fully understand how it worked best to see a diagram or hold one in your hand
The latter could not be rebuild as the Metal Cone and tapered cylinder would eventually wear to a point of poor contact while the former you could replace the
cluthes and springs.

Been drinking but thats what I recall'
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Old 01-19-2011, 11:51 PM   #9
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What is the purpose of Suspension Linkage?

Quote:
Originally Posted by Vividkid View Post
"How exactly does the posi-trac rear end on a Plymouth work!?
It just does. It just does."
Lol

It's best not to question some things. Or my personal favorite PFT ( pure magic)
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