CaptainSerMig Posted June 16 Posted June 16 (edited) While building this I realized that most liftable axles in heavy trucks steer by themselves thanks to specific caster angles and auto-center when lifted. It's hard to replicate that function at this scale so this is my alternative to the problem (haven't done much research to see if it was implemented before): it uses a rubber joint that gets stretched when the lifted axle is locked straight, thus allowing the front axle to steer. As a side effect it allows different steering radii thanks to the fact that the rear axle has a limiter (2x4 L beam). Still have to test it under heavy loads, but i suspect that by lifting it a few fractions of a millimeter it should steer fine. https://flic.kr/p/2rbiVFx https://flic.kr/p/2rbiVHX https://flic.kr/p/2rbdjpe https://flic.kr/p/2rbhQ1V https://flic.kr/p/2rbiP1V https://flic.kr/p/2rbhPTk Edited June 16 by CaptainSerMig Trying to turn the links into images to no avail... Mods help please Quote
jorgeopesi Posted June 16 Posted June 16 Nice, the best I have ever seen so far is the one Designer Han used in his 5 axles dump truck but I did not see a lot of more... 5 axles dump truck Quote
CaptainSerMig Posted June 16 Author Posted June 16 26 minutes ago, jorgeopesi said: Nice, the best I have ever seen so far is the one Designer Han used in his 5 axles dump truck but I did not see a lot of more... 5 axles dump truck Man that’s some quality truck! I still haven’t fully grasped how the steering reallignes after the axle is lowered again. I suppose a full left or full right is less than 1/4th of a rotation of that yellow 4 lobed gear, so it slips into place? My solution is definitely far less refined, I’m not sure I have the skills to accomplish such a mechanism, but I’m satisfied with what I have so far. Will try to update the topic as the moc progresses Quote
jorgeopesi Posted June 17 Posted June 17 It is very simple the axle has some slope brick and when It raises the slopes make contact with the chassis so the wheels move. Quote
1gor Posted June 17 Posted June 17 That is something I was thinking about untill I saw one container truck parked with raized rear (liftable) axle and it was pointing in oposite direction than fromt wheels (like in your second image link), but steering angle was smaller... From info (distributer's info) it steeres even when it is lifted and it is hydraulic steering connected with truck steering system. The info is from M.A.N. distributer, but I don't know is every 6 x 2 M.A.N. model has it or not and not to mention other brands... Quote
CaptainSerMig Posted June 17 Author Posted June 17 1 hour ago, 1gor said: That is something I was thinking about untill I saw one container truck parked with raized rear (liftable) axle and it was pointing in oposite direction than fromt wheels (like in your second image link), but steering angle was smaller... From info (distributer's info) it steeres even when it is lifted and it is hydraulic steering connected with truck steering system. The info is from M.A.N. distributer, but I don't know is every 6 x 2 M.A.N. model has it or not and not to mention other brands... That would make sense, a much less intricate mechanism. I guess it varies from manufacturer to manufacturer as here in Italy Iveco recycling trucks don’t steer the third axle when it’s lifted. I’ll have to look into it Quote
1gor Posted June 17 Posted June 17 19 minutes ago, CaptainSerMig said: That would make sense, a much less intricate mechanism. I guess it varies from manufacturer to manufacturer as here in Italy Iveco recycling trucks don’t steer the third axle when it’s lifted. I’ll have to look into it You have to decide wether you will replicate real truck or make generic one. If second is the case, they you have all freedom that is allowed with parts from your inventory... ...we in Croatia have mostly highway Iveco trucks, but Gernan abd Scandinavizn brands are mostly used; probably it is dealers choice (which brand gives highest interest...) Kind regards Quote
Jundis Posted June 18 Posted June 18 4 a.m. ... can't sleep ... reads thread about steerable and liftable third truck axle ... remembering a model I built but never published ... built a mock up with sleepy eyes .... make a pic ... trying to go to bed again ... https://i.ibb.co/r2h2TLzT/DSC-0264.jpg Quote
CaptainSerMig Posted June 18 Author Posted June 18 @1gor I’d be satisfied with a generic truck, as long as the functions exist IRL @Jundis ah yes the random 4am burst of energy! I feel ya Quote
1gor Posted June 18 Posted June 18 9 hours ago, Jundis said: 4 a.m. ... can't sleep ... I know the feeling.. Quote
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