While I understood that the Johnson Bar controlled whether the engine went forward or reverse, I didn't understand all the mechanical issues involved. This animation makes it clear what the Johnson bar is doing. While I could see all the parts at the Railroad Museum where I volunteer, I could never see the parts in motion. Thank you for showing how it all works together.
Came here for an easy way to understand how the Walschaerts Valve Gear works (I’m a visual learner) and learn through the comments that you did this IN HAPPY WHEELS? Colour me impressed
I wonder if you could do a more obscure valve gear like the joy valve gear or even the corliss valve gear (I know they were used in mills but it would be interesting on a loco)
If you compare the movement of the top pin of the combination lever (at the radius rod) to the middle pin (at the valve stem), you will see how much farther the valve travels as well as the difference in timing. Locomotive valve gear is akin to a mechanical calculator that combines two different motions; the first is a constant lead motion that is derived from the movement of the crosshead and sets the core movement and valve timing, and the second is a direction and amplitude component that is derived from the radius rod and expansion link that sets direction of the engine and the amount of steam admitted. The combination lever, as the name implies, combines both of these inputs into the final output of the valve stem. Note that on center, the combination lever is only receiving input from the constant lead motion of the main rod. In my stephenson gear animation, the lead motion is created by offsetting the two eccentrics per side away from 90 degrees which causes the center point of the expansion link to oscillate even in neutral, but on Walschaerts gear, there is only one eccentric per side that must be at 90 degrees and the expansion link's center is fixed, which means the lead motion must then be derived from elsewhere, hence the combination lever is added.
This is a really great animation! I have also watched your Stephenson valve gear animation and have commented on it. Have you ever considered doing an animation on the Baker valve gear?
I've never understood the point in the combination lever section. Wouldn't adjusting the position of the return crank slightly do the same thing? Obviously it's tried and tested. There's a reason its built this way, but i can't figure it out.
note that when the reverser is in neutral, the combination lever still imparts movement to the valve from the main rod. offsetting the return crank would not achieve this movement, it would only throw the valves out of time
@@WingsStrings I see, I've noticed it moves the valve a little earlier than the return crank would on its own in both directions too. Adjusting the return crank would only add that extra open valve time on one side.
The combination (aka lead and lap) lever moves the valve off of the crosshead. The amount that the valve moves is 2(lap + lead) where "lap" is how much the valve overhangs the steam port when the valve is centered and "lead" is how much the valve is open on front/rear dead center. When the valve gear is in center (same with Baker) the only motion imparted to the valve is from the crosshead through the lead and lap lever. When properly set, the loco can run forwards and reverse in center - although it won't have much power - off of the lead of the valve. The eccentric crank imparts the motion to the link and then to the valve. When the piston is on front/rear dead center, the link must be in the same location - moving the eccentric crank on the crank pin will change the location of the link at dead center. The motion of the eccentric crank imparts the most motion to the valve when running in the corner (full forward or full reverse) and diminishes as the valve gear is hooked up. When the valve gear is in center, the eccentric crank does not impart any motion to the valve.
@@WingsStrings Note that there is no neutral. When the valve gear is centered, the valve still opens at front/rear dead center (this is called, "lead") and when the valves are properly set, the loco can still run forward/reverse - although it won't have much power - because steam is still being admitted to push on the piston
@@WingsStrings There is NO neutral on a steam locomotive - I have no idea why people call it neutral as it isn't. The valve gear is in center when the link block is on the trunion centerline and the valve moves 2(lap + lead) You are right that the combination lever is for lead (it is not solely for lead but the moves the valve 2(lap + lead) where lead is how much the valve is open on dead center (steam is being admitted) and lap is how much the valve overhangs the steam port when the valve is centered) Since the lead and lap lever (aka combination lever) moves the valve 2(lap + lead) AND Walshaert valve gear is a constant lead valve gear, the lead (how much the valve is open on front/rear dead center) is the same no matter where the valve gear is hooked up. This means that when in center, the lead and lap lever (aka combination lever) is moving the valve and is giving the same lead in center as it does in forward/reverse (and the exhaust passageway is open the same amount on dead center no matter where the valve gear is hooked up to) Since the valve is uncovering the steam port (lead) on dead center, steam can be admitted to push on the piston in center. Since there is no motion being imparted from the radius rod, the valve is opening/closing evenly about dead center and the loco can run in forwards or in reverse (when the valve gear is properly set and minimal load) when the valve gear is in center. Running in center does not produce much power, but it is possible when properly set up.
@@WingsStrings Here are some youtube videos of miniature locos running in center - these have 1/32" lead (valve is open 1/32" on dead center and that is all the valve port opening they have when running with the valve gear in center). Full size locos can do it too - locos with Stephenson valve gear can run forwards with the valve gear set slightly behind center (to the reverse of center) when properly set up ruclips.net/video/bXMHhaQu2Z0/видео.html ruclips.net/video/tVnhE99jnWA/видео.html ruclips.net/video/uj0QMC1NbFo/видео.html
@@mikado1555 Edit: after digging into the old files used for the animation, the hitbox is set to show steam right when the ports are opened; if they are meant to open on center but the animation is not, then it may be that the combination lever in the diagram is a bit too long and thus not providing enough lead to reach the hitbox and uncover the ports.
While I understood that the Johnson Bar controlled whether the engine went forward or reverse, I didn't understand all the mechanical issues involved. This animation makes it clear what the Johnson bar is doing. While I could see all the parts at the Railroad Museum where I volunteer, I could never see the parts in motion. Thank you for showing how it all works together.
Wings' attention to detail is simply inspiring. What an absolute masterpiece.
For something made in Happy Wheels, this is absolutely beautiful.
This was made in happy wheels!?!?
@@pilky7 It was???!
@@nathanperoandrei3841 looks like it
Indeed
I need a name for this i want go try it
I don't know that i've ever seen this laid out more clearly... thanks!
Excellent demonstration. Makes it clear, even without words, what it does. Simply controls the amount of steam to the piston, but it shows how!!
The best animation I've ever seen so far.
ไช่
holy cow, never been able to understand how it all works before, this is great!
Came here for an easy way to understand how the Walschaerts Valve Gear works (I’m a visual learner) and learn through the comments that you did this IN HAPPY WHEELS? Colour me impressed
This is nothing short of absolutely amazing.
The pistons work together to create that wonderful movement
Thankyou for showing how everything works. Love it 😀
Do a cut away model of how steam moves the wheels. Going down the drypipe into the branch pipes, to the cylinders, and finally up the stack.
I'm excited for this
Very impressive. Can it get stuck if the main is exactly horizontal when the train is standing still?
Best one Iv'e seen for how it all work's. some video's get too complicated about this subject
I wonder if you could do a more obscure valve gear like the joy valve gear or even the corliss valve gear (I know they were used in mills but it would be interesting on a loco)
Wonderful animation and locomotive! 😍😍😍😍😍🤩🤩🤩
Be very nice to see an animation of a Southern valve gear
any way i can use this myself?
The only reason why I love this valve gear is because of the rods (it looks so satisfying)
Excellent!
is it released yet?
Nice video!!
Stunning!
is this a website? if so can you leave link plz
Whats up WTYPpod fans!
Great work! Which software was used for it? Unity/Unreal?
Where’s the audio?
Amazing animation 👌 👌👌
I like it please other video
is this direct or indirect?
What is this website
What's the purpose of the combination lever? Why not connect the radius rod straight to the valve rod?
If you compare the movement of the top pin of the combination lever (at the radius rod) to the middle pin (at the valve stem), you will see how much farther the valve travels as well as the difference in timing.
Locomotive valve gear is akin to a mechanical calculator that combines two different motions; the first is a constant lead motion that is derived from the movement of the crosshead and sets the core movement and valve timing, and the second is a direction and amplitude component that is derived from the radius rod and expansion link that sets direction of the engine and the amount of steam admitted. The combination lever, as the name implies, combines both of these inputs into the final output of the valve stem. Note that on center, the combination lever is only receiving input from the constant lead motion of the main rod.
In my stephenson gear animation, the lead motion is created by offsetting the two eccentrics per side away from 90 degrees which causes the center point of the expansion link to oscillate even in neutral, but on Walschaerts gear, there is only one eccentric per side that must be at 90 degrees and the expansion link's center is fixed, which means the lead motion must then be derived from elsewhere, hence the combination lever is added.
Man I do wonder if there will be a game one day that will bring this level of accuracy to a train simulator…
Look up Century of Steam
This is a really great animation! I have also watched your Stephenson valve gear animation and have commented on it. Have you ever considered doing an animation on the Baker valve gear?
I've never understood the point in the combination lever section. Wouldn't adjusting the position of the return crank slightly do the same thing? Obviously it's tried and tested. There's a reason its built this way, but i can't figure it out.
note that when the reverser is in neutral, the combination lever still imparts movement to the valve from the main rod. offsetting the return crank would not achieve this movement, it would only throw the valves out of time
@@WingsStrings I see, I've noticed it moves the valve a little earlier than the return crank would on its own in both directions too. Adjusting the return crank would only add that extra open valve time on one side.
The combination (aka lead and lap) lever moves the valve off of the crosshead. The amount that the valve moves is 2(lap + lead) where "lap" is how much the valve overhangs the steam port when the valve is centered and "lead" is how much the valve is open on front/rear dead center. When the valve gear is in center (same with Baker) the only motion imparted to the valve is from the crosshead through the lead and lap lever. When properly set, the loco can run forwards and reverse in center - although it won't have much power - off of the lead of the valve.
The eccentric crank imparts the motion to the link and then to the valve. When the piston is on front/rear dead center, the link must be in the same location - moving the eccentric crank on the crank pin will change the location of the link at dead center. The motion of the eccentric crank imparts the most motion to the valve when running in the corner (full forward or full reverse) and diminishes as the valve gear is hooked up. When the valve gear is in center, the eccentric crank does not impart any motion to the valve.
@@WingsStrings Note that there is no neutral. When the valve gear is centered, the valve still opens at front/rear dead center (this is called, "lead") and when the valves are properly set, the loco can still run forward/reverse - although it won't have much power - because steam is still being admitted to push on the piston
Can you upload this to the community levels section? This is amazing!
How many times per second the valve of the steam locomotive moves ?
Depends on the speed.
How do i get to this?
Why isn't steam being admitted in center? The valve opens and the loco can run in forward or reverse in center.
@@WingsStrings There is NO neutral on a steam locomotive - I have no idea why people call it neutral as it isn't. The valve gear is in center when the link block is on the trunion centerline and the valve moves 2(lap + lead)
You are right that the combination lever is for lead (it is not solely for lead but the moves the valve 2(lap + lead) where lead is how much the valve is open on dead center (steam is being admitted) and lap is how much the valve overhangs the steam port when the valve is centered)
Since the lead and lap lever (aka combination lever) moves the valve 2(lap + lead) AND Walshaert valve gear is a constant lead valve gear, the lead (how much the valve is open on front/rear dead center) is the same no matter where the valve gear is hooked up.
This means that when in center, the lead and lap lever (aka combination lever) is moving the valve and is giving the same lead in center as it does in forward/reverse (and the exhaust passageway is open the same amount on dead center no matter where the valve gear is hooked up to)
Since the valve is uncovering the steam port (lead) on dead center, steam can be admitted to push on the piston in center. Since there is no motion being imparted from the radius rod, the valve is opening/closing evenly about dead center and the loco can run in forwards or in reverse (when the valve gear is properly set and minimal load) when the valve gear is in center. Running in center does not produce much power, but it is possible when properly set up.
@@WingsStrings Here are some youtube videos of miniature locos running in center - these have 1/32" lead (valve is open 1/32" on dead center and that is all the valve port opening they have when running with the valve gear in center). Full size locos can do it too - locos with Stephenson valve gear can run forwards with the valve gear set slightly behind center (to the reverse of center) when properly set up
ruclips.net/video/bXMHhaQu2Z0/видео.html
ruclips.net/video/tVnhE99jnWA/видео.html
ruclips.net/video/uj0QMC1NbFo/видео.html
@@mikado1555 Edit: after digging into the old files used for the animation, the hitbox is set to show steam right when the ports are opened; if they are meant to open on center but the animation is not, then it may be that the combination lever in the diagram is a bit too long and thus not providing enough lead to reach the hitbox and uncover the ports.
Pretty sure the live and exhaust steam are wrong way round.
The big pipe going to smoke box enters the blast pipe.
The central pipe is the dry pipe from the dome which supplies live steam. For inside admission, the exhaust ports are on the ends of the piston.
@@WingsStrings wow, you learn something every day. Cheers 🍻
I can't find this anywhere where can I find this
Is there audio?
How can I use this myself?
what is this on
Excellent! :-)
@WingsStrings link pls
Thanks now I can build a stem engine
what is the level name
cool
What game?
whats the game
Heusinger valve gear!!!
is a game?
idk
@@israelyadao8636 What was the point of replying then?
Using maths right ?
So this is what's inside the locomotive as you see it's parts, lever and side rods.
How is this Happy wheels holy hell
Came for info left because no voice over.
I thought it a android application
หน้างวง
ยอดเยี่ยมจริงๆขอชมด้วยหัวใจผมเข้าใจรถไฟไอน้ำเดินหน้าถอยหลังอย่างไรหยุดอย่างไรจะให้มันช้าเร็วอย่างไรและรู้ว่าslidvalveมี2แบบvdoนี้วิเศษจริงๆ