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Posted for "Rumburg, William" <wrumburg@cdicorp.com> for no subject in
submitted post:
I hate to disagree with Bill R. who has contributed so much here, but I
don't think the hydraulic cylinder adds any load to the attach block when
the gear is in the down/overcenter position. The internal stop in the
cylinder takes the force of the hydraulic pressure when the cylinder is
fully extended. Prove this to yourself by seeing how easy it is to
slightly
rotate the overcenter link on its spherical joints. I believe the only
significant loads on the attach block are from side pressures on the
wheel.
Bob -
Well, this is a good time to disagree with me, because you're correct -
provided that the cylinder travel limits are set correctly and precisely.
In the down/locked position, the cylinder is fully extended and the rod end
MUST be adjusted so that there is no force applied to the overcenter link,
thus the OC link is held locked but "feels" no load from the cylinder. This
must be precisely adjusted, because if you're off by only a few
thousandths, the full force of the cylinder will be applied to the OC link
(and both attach points will be unnecessarily loaded). Although this may be
"dry run" when building, it must be checked and set with the system
operational, because the cylinder end cap will shift slightly under actual
load. The up stop is then set for full retract using the "stop collar", with
washers as shims to achieve a reaction against the cylinder end cap. This
is also somewhat critical, but not as much as the down stop.
Bill Rumburg
N403WR (Sonic bOOm)
[Sorry, Bill, but I decided to use my resubmitted version of your post to keep the subject the same as most of the rest of the thread. <Marv> ]
LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
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