Author Topic: Building a JD Forwarder Model, and Have Questions About the Bogies (Read 2062 times)

twinotter · « **on:** October 23, 2011, 02:30:23 pm »

Hey all,

So, I'm a newb here and just joined to ask about the bogie axles on the John Deere 1910E Forwarder.

I'm a bit embarrassed to admit this, but I'm building a LEGO Technic model of this Forwarder. The plan is to make it remote controlled with pneumatics instead of hydraulics.

Anyways, my question is about the bogie design. How is power transferred from the differential to the wheel hubs? Is there a chain, idler gears, axle shafts, or some other method? If I understand correctly, these bogies have portal hubs also. How much additional clearance do the portal hubs offer, and is there any gear reduction in the hubs themselves?

I think that's about all the questions I have for now. Sorry about the juvenile questions.

Thanks!
Daniel

Taylortractornut · « **Reply #1 on:** October 23, 2011, 03:38:01 pm »

Daniel dont be embarrassed about asking a question on here, especially about legos

. Im 32 and I have my old Techic sets out i nthe welding shop. I use mine for working out angles and pivot points in machinery I build.

mad murdock · « **Reply #2 on:** October 23, 2011, 04:07:44 pm »

Welcome to the forestry Forum. Good questions.

Jamie_C · « **Reply #3 on:** October 23, 2011, 05:23:07 pm »

Axle from differential out to bogie housing, gear reduction in each hub ... at least thats the way all the B, C & D machines were.

twinotter · « **Reply #4 on:** October 23, 2011, 07:50:37 pm »

Thanks for the welcome! This seems like a friendly forum.

Jamie_C, once the axle from the diff enters the bogie housing, how is power transfered to the hubs?

I know some road graders use chains in the bogie housing, but I'm not sure if it's the same setup in forwarders.

Thanks,
Daniel

furltech · « **Reply #5 on:** October 24, 2011, 01:30:04 pm »

The old 1010 had chains in the first bogie style then they changed them to a gear , but the new stuff is gears .

semologger · « **Reply #6 on:** October 24, 2011, 07:55:43 pm »

welcome to the forum. I also still have alot of legos have passed them down to my kids now. but when they come out i usualy sit in the floor playing with them longer than the kids do. Im 34 years old.

amberwood · « **Reply #7 on:** October 24, 2011, 11:30:46 pm »

My son is three, and just discovered the bucket of my old lego under the spare bed. I am now reminded of how painfull those little blocks are in bare feet. Yes I play with them as much as he does.

DTR

twinotter · « **Reply #8 on:** October 26, 2011, 10:10:27 pm »

Would I be correct in assuming that the newer, non chain driven bogies use idler gears inside the bogie housing? Or does the gear on the end of the axle shaft mesh directly with the gears in the hubs?

Thanks for all the help guys! It's nice to see there are some LEGO builders here.

I'm 28 and just got back into LEGOs a couple years ago after a 10 year break. My youtube link under my username has some of the other projects I built.

This project will probably take me a few months to complete, but if you all would like, I can post a video once it's complete.

Thanks,
Daniel

Jeff · « **Reply #9 on:** October 26, 2011, 10:29:48 pm »

Absolutely. Looking at your other creations, I have no doubt that the forwarder will be pretty cool to see.

Dom · « **Reply #10 on:** October 27, 2011, 07:12:22 am »

Yes, the bogie uses idler gears.
If I remember correctly, the Rottne SMV bogie had 6 idlers per side. The hubs had they own bigger gears connecting to the idlers, and the differential had its "medium sized" gear in the bogie as well to distribute power. Total of 9 gears in the bogie. I could be wrong on the 6 idlers, I can call a friend quickly to find out if you want.

Rottne purchased its bogie from NAF, and so did most manufactuers, so I would imagine JD to have a similar concept.

tjdub · « **Reply #11 on:** October 27, 2011, 03:24:05 pm »

They say a picture is worth a thousand words. Here's the part diagram for the 1910E:

http://jdpc.deere.com/pimages/0000/0000537375____________A1.gif

twinotter · « **Reply #12 on:** October 27, 2011, 09:57:10 pm »

Thanks! That diagram is perfect. I should be able to build something similar, with similar gear ratios.

It looks like there is a planetary gear set where the axle from the diff enters the bogie housing. I'm going to try to incorporate this into the model too, but I may not have space.

Thanks for the help!

twinotter · « **Reply #13 on:** October 29, 2011, 08:58:55 pm »

tjdub, would you happen to have a diagram for the bogie end of the axle shaft? I'm trying to figure out what the planetary gear set looks like, if it even has one.

Looking at the diagram, having the sun gear in the bogie and the ring gear bolted to the bogie housing would mean the planet gears would be attached to the end of the axle shaft. That doesn't make sense since that would result in an increased gear ratio. I must be looking at things wrong, or there is a more complex planetary gear set. Or maybe I'm just over thinking this.

Anyways, I've got half a bogie built, with the gears setup very close to the diagram. I just need to build the part where the bogie connects to the axle shaft, but I need to figure out if I want to do a planetary gear set in there.

Thanks

twinotter · « **Reply #14 on:** October 30, 2011, 02:14:04 pm »

Nevermind, I'm not going to have room for a planetary gear set.

tjdub · « **Reply #15 on:** October 31, 2011, 02:47:21 pm »

If you change your mind, you can view any part diagram you want here:

http://jdparts.deere.com/

Just click in the link "John Deere Parts Catalog" on the left, then type in the Model.

twinotter · « **Reply #16 on:** October 31, 2011, 10:32:33 pm »

Awesome, thanks!

I found this diagram which does show a planetary gear set at the end of each axle. It's interesting because it looks like it is basically a double planetary set per side, but each planetary set appears to have the same gear ratios. I'm not sure exactly what the point of this is, since it appears that the planetary input and output shafts would spin at the same speed. It looks like there are some clutch packs in the axle housing too, with must have something to do with the planetary gear sets. I'm not sure what this setup is used for, but I find it intriguing.

Anyways, I just thought it was interesting. I'm not going to have room for this setup.

Thanks!

furltech · « **Reply #17 on:** November 01, 2011, 04:53:19 am »

The clutch packs are the brakes

Piston · « **Reply #18 on:** November 06, 2011, 04:31:50 am »

Quote

The plan is to make it remote controlled with pneumatics instead of hydraulics.

Will you have some sort of small pressure tank or compressor mounted on it? Sounds really interesting.

I'd love to see a picture of your project when it's complete (or before

)

I've often thought of building an RC scaled logging truck with loading grapple, similar to the scale RC trailer truck rigs you can buy/build. I don't think I have that kind of patiences/skill though.

twinotter · « **Reply #19 on:** November 06, 2011, 07:18:04 pm »

Quote from: furltech on November 01, 2011, 04:53:19 am

The clutch packs are the brakes

Well, that's some fancy brakes! I never looked to see how the brakes on heavy machinery were built, and I always assumed they used drum or trans brakes.

Quote from: Piston on November 06, 2011, 04:31:50 am

Quote
The plan is to make it remote controlled with pneumatics instead of hydraulics.
Will you have some sort of small pressure tank or compressor mounted on it? Sounds really interesting.

I'd love to see a picture of your project when it's complete (or before )

I've often thought of building an RC scaled logging truck with loading grapple, similar to the scale RC trailer truck rigs you can buy/build. I don't think I have that kind of patiences/skill though.

I plan on mounting several pneumatic compressors on the model itself. I'll have a 9v motor driving 4 compressors, and I'll also rig up a pressure switch to turn the motor on/off as needed. I do have some small air tanks I can use, but I'm not sure I will have room. The boom, jib, grapple, dozer, and retractable step will be pneumatic; and the boom slew, cab swivel, grapple rotate, jib extension, and drive will be electric. Steering will be built using some linear actuators driven off a motor.

I used a single air compressor (no tank though) and pressure sensor on my Case Steiger tractor I built:

I will be using a similar steering setup as well. I'll post a few pictures once I get a bit more work done on the forwarder.

Thanks,
Daniel

twinotter · « **Reply #20 on:** January 15, 2012, 05:41:30 pm »

I thought I should update this thread. I'm making some progress, but I haven't had much time to work on the forwarder. The chassis is almost complete, and I've been able to include planetary gears in each bogie. I've got a bit more work on the chassis, then I'll be moving to the boom.

I have another question though. Does the boom base have sideshift capability? What are the cylinders in this picture for? Are they some kind of hydraulic cylinders? Picture is the base of the boom.

Thanks!

Jeff · « **Reply #21 on:** January 15, 2012, 05:58:31 pm »

I'm not positive, but would bet that is the double hydraulic rack and pinion assembly that turns the boom. The racks slides back and forth in those housing, turning the pinion. A rack on each side of the pinion gear, moving in opposite directions to turn the gear/boom.

beenthere · « **Reply #22 on:** January 15, 2012, 06:14:07 pm »

Like Jeff said, and here is what is inside (to skew, according to jdparts).

twinotter · « **Reply #23 on:** January 15, 2012, 08:00:26 pm »

Thanks! I've been in a debate with a guy who claims that it is part of a side shift, but I haven't seen any evidence of that in any research that I've done. You guys have just confirmed what I was thinking.

That's an interesting skew mechanism. Pretty cool.

Thanks again!
Daniel

mad murdock · « **Reply #24 on:** January 15, 2012, 08:23:18 pm »

All I can say is WOW twinotter! That is some awesome modeling you got going on

I can't wait to see the forwarder in action! BTW, your handle wouldn't be in reference to a DHC-6 by chance? Just wondering.

twinotter · « **Reply #25 on:** January 16, 2012, 04:28:06 pm »

Quote from: mad murdock on January 15, 2012, 08:23:18 pm

All I can say is WOW twinotter! That is some awesome modeling you got going on
I can't wait to see the forwarder in action! BTW, your handle wouldn't be in reference to a DHC-6 by chance? Just wondering.

Thanks! Yup, twinotter is in reference to the DHC-6 twinotter. Dhc6twinotter is the username I usually go by on other forums, but not sure why I went with the short version here. I'm never good at picking usernames, so I just go with the name of aircraft.

mad murdock · « **Reply #26 on:** January 16, 2012, 05:16:21 pm »

I had a suspicion ;)I worked in bush Alaska for a few years, worked on the -200 and -300 'Twotter. Great aircraft. Got a chance to fly a few times in a re-engined DHC-3 (big russian radial and 4 bladed prop), that was a FUN plane, and quite a HOSS! How long does one of the LEGO creations take to build? I find it quite incredible the level of detail and realism that is present in your models! Thanks for sharing your craft on the 'Forum.

twinotter · « **Reply #27 on:** January 16, 2012, 11:04:41 pm »

The time depends on the model. I just got back into LEGO after finishing school, so I'm still in the learning process. My tractor was my first model, and that took probably 70 hours or so. Everything on it had been rebuilt at least once, and some of it I rebuilt about 20 different times. The backhoe took about 80 hours or so, but that is much, much more complex than the tractor. The little radial engine with variable pitch prop I built took about 7 hours. I usually only get 1 or 2 major project done in a year. I watch very little TV and don't play video games, so this is pretty much what I do on my downtime (along with posting on several forums).

I've never had a chance to fly on a real Twinotter. Back at my old place, a local parachute outfit used to fly one out of a grass strip down the road. They'd buzz the trees around the house sometimes. Very cool planes. I think they are using a Sherpa now, but not sure.

I'd like to build a few aircraft too. Grumman Avenger is at the top of my list, and I'd like to build a P-38, B-25, and a DHC2 Beaver on floats as well. They would include working flight control surfaces, and whatever other functions that particular plane has.

I'll post up some progress pictures in a few days.

Thanks!
Daniel

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Author Topic: Building a JD Forwarder Model, and Have Questions About the Bogies (Read 2062 times)