[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.70,0:00:04.46,Default,,0000,0000,0000,,Some technologies are easier to understand\Nwith the help of 3D animation.
Dialogue: 0,0:00:07.04,0:00:10.41,Default,,0000,0000,0000,,But, what about the 6-Speed \Nautomatic transmission from Allison.
Dialogue: 0,0:00:13.26,0:00:16.95,Default,,0000,0000,0000,,To visualize and understand this beautiful\Nplanetary gear set mechanism,
Dialogue: 0,0:00:17.06,0:00:19.24,Default,,0000,0000,0000,,a 2D animation will be ideal.
Dialogue: 0,0:00:19.84,0:00:23.74,Default,,0000,0000,0000,,You can consider this 2D drawing as \Na cross section of the 3D model.
Dialogue: 0,0:00:25.04,0:00:28.81,Default,,0000,0000,0000,,A planetary gear set has \N2 inputs and 1 output.
Dialogue: 0,0:00:29.88,0:00:33.25,Default,,0000,0000,0000,,If you properly understand \Nworking of a planetary gear set,
Dialogue: 0,0:00:33.25,0:00:37.34,Default,,0000,0000,0000,,you can easily understand automatic \Ntransmissions from the 2D animation.
Dialogue: 0,0:00:41.99,0:00:44.47,Default,,0000,0000,0000,,The essence of the planetary gear set is that
Dialogue: 0,0:00:44.47,0:00:47.83,Default,,0000,0000,0000,,just by giving different speeds \Nto the ring and sun gears,
Dialogue: 0,0:00:47.83,0:00:50.58,Default,,0000,0000,0000,,you will be able to get different\Nspeeds at the output.
Dialogue: 0,0:01:00.07,0:01:02.38,Default,,0000,0000,0000,,The beauty of automatic transmissions lies
Dialogue: 0,0:01:02.38,0:01:05.04,Default,,0000,0000,0000,,in how these different input \Nspeeds are transmitted.
Dialogue: 0,0:01:05.45,0:01:07.72,Default,,0000,0000,0000,,Let's see it in the 2D animation.
Dialogue: 0,0:01:11.10,0:01:15.16,Default,,0000,0000,0000,,This 3D planetary set \Nis represented in 2D as shown.
Dialogue: 0,0:01:17.92,0:01:19.77,Default,,0000,0000,0000,,In an automatic transmission,
Dialogue: 0,0:01:19.77,0:01:22.43,Default,,0000,0000,0000,,the input and the output are \Nnot directly connected.
Dialogue: 0,0:01:22.65,0:01:25.79,Default,,0000,0000,0000,,They are connected through \Nan intermediate shaft as shown.
Dialogue: 0,0:01:26.92,0:01:30.00,Default,,0000,0000,0000,,Now, a small suggestion before you proceed.
Dialogue: 0,0:01:30.00,0:01:32.94,Default,,0000,0000,0000,,You will be able to explain \Nall seven gears by yourself
Dialogue: 0,0:01:32.94,0:01:36.61,Default,,0000,0000,0000,,by pausing the video for a moment \Nand understanding the mechanism.
Dialogue: 0,0:01:36.85,0:01:39.14,Default,,0000,0000,0000,,Please try that at every single gear.
Dialogue: 0,0:01:39.14,0:01:42.25,Default,,0000,0000,0000,,You will be amazed by \Nthe brilliance of this mechanism.
Dialogue: 0,0:01:43.54,0:01:45.62,Default,,0000,0000,0000,,If you press clutch C1,
Dialogue: 0,0:01:45.62,0:01:48.03,Default,,0000,0000,0000,,the input will be connected to the sun gear.
Dialogue: 0,0:01:48.40,0:01:52.51,Default,,0000,0000,0000,,If you press clutch C5, the output \Nrain gear will be stationary.
Dialogue: 0,0:01:53.09,0:01:55.30,Default,,0000,0000,0000,,This will result in the first gear.
Dialogue: 0,0:01:58.20,0:02:00.24,Default,,0000,0000,0000,,Now let's add one more gear set.
Dialogue: 0,0:02:00.49,0:02:02.01,Default,,0000,0000,0000,,Here comes the tricky part.
Dialogue: 0,0:02:02.01,0:02:05.92,Default,,0000,0000,0000,,The carrier of this set is connected \Nto the ring gear of the first set.
Dialogue: 0,0:02:06.06,0:02:07.17,Default,,0000,0000,0000,,This simply means that
Dialogue: 0,0:02:07.17,0:02:11.13,Default,,0000,0000,0000,,the output of the second set is \Nconnected to the input of the first set.
Dialogue: 0,0:02:11.81,0:02:16.26,Default,,0000,0000,0000,,Think for a moment about what happens\Nwhen you apply C1 and C4.
Dialogue: 0,0:02:19.68,0:02:24.11,Default,,0000,0000,0000,,Since C4 is applied, the ring gear of\Nthe second set will be stationary.
Dialogue: 0,0:02:24.35,0:02:26.15,Default,,0000,0000,0000,,This makes the carrier turn.
Dialogue: 0,0:02:26.47,0:02:29.55,Default,,0000,0000,0000,,This carrier is connected to \Nthe ring gear of the first set.
Dialogue: 0,0:02:29.72,0:02:32.96,Default,,0000,0000,0000,,So, the ring gear of \Nthe first set will also turn.
Dialogue: 0,0:02:33.18,0:02:36.76,Default,,0000,0000,0000,,This, in turn, will increase \Nthe output speed
Dialogue: 0,0:02:36.92,0:02:39.22,Default,,0000,0000,0000,,or we will get the second gear.
Dialogue: 0,0:02:40.99,0:02:46.65,Default,,0000,0000,0000,,To obtain a fourth gear or direct drive,\Na rotating clutch module is also used.
Dialogue: 0,0:02:47.81,0:02:49.71,Default,,0000,0000,0000,,We know that for a direct drive,
Dialogue: 0,0:02:49.71,0:02:53.34,Default,,0000,0000,0000,,both the sun and the ring gear\Nshould rotate at the input speed.
Dialogue: 0,0:02:54.28,0:02:59.05,Default,,0000,0000,0000,,If we press C2 and C1 together,\Nthis is what happens.
Dialogue: 0,0:03:01.19,0:03:03.22,Default,,0000,0000,0000,,In the very same mechanism,
Dialogue: 0,0:03:03.22,0:03:08.13,Default,,0000,0000,0000,,if you apply C2 and C4 you will \Nget very high speed at the output.
Dialogue: 0,0:03:08.54,0:03:11.39,Default,,0000,0000,0000,,Think for a moment and\Ntry to understand this.
Dialogue: 0,0:03:11.39,0:03:15.43,Default,,0000,0000,0000,,It is clear that the carrier of the second\Nset will turn at the input speed.
Dialogue: 0,0:03:15.68,0:03:18.64,Default,,0000,0000,0000,,However, here the ring gear is stationary.
Dialogue: 0,0:03:20.68,0:03:24.70,Default,,0000,0000,0000,,This makes the sun gear turn at almost \Nthree times the speed of the input.
Dialogue: 0,0:03:24.82,0:03:25.71,Default,,0000,0000,0000,,Eventually,
Dialogue: 0,0:03:25.71,0:03:28.34,Default,,0000,0000,0000,,a very high output speed is obtained.
Dialogue: 0,0:03:30.64,0:03:34.16,Default,,0000,0000,0000,,One more gear set is used to obtain \Nthe remaining gear ratios.
Dialogue: 0,0:03:34.33,0:03:38.30,Default,,0000,0000,0000,,However, the sun gear of this set \Nis not connected to the shaft.
Dialogue: 0,0:03:38.41,0:03:41.86,Default,,0000,0000,0000,,Instead, it is connected to \Nthe rotating clutch module.
Dialogue: 0,0:03:41.98,0:03:45.66,Default,,0000,0000,0000,,So, this sun gear will always turn \Nat the input speed.
Dialogue: 0,0:03:46.26,0:03:47.56,Default,,0000,0000,0000,,And here again,
Dialogue: 0,0:03:47.56,0:03:51.07,Default,,0000,0000,0000,,the output of the set is connected\Nto the input of the adjacent set.
Dialogue: 0,0:03:51.95,0:03:55.90,Default,,0000,0000,0000,,For the remaining gear ratios,\NC3 is always applied.
Dialogue: 0,0:03:55.90,0:03:59.49,Default,,0000,0000,0000,,This means that the brown carrier\Nor ring gear of the second set
Dialogue: 0,0:03:59.49,0:04:02.80,Default,,0000,0000,0000,,will turn at one-third of the input speed\Nfor the remaining cases.
Dialogue: 0,0:04:05.55,0:04:08.82,Default,,0000,0000,0000,,For the third gear, apply see one as well.
Dialogue: 0,0:04:13.20,0:04:17.60,Default,,0000,0000,0000,,For the fifth gear, \Napply C2 along with C3.
Dialogue: 0,0:04:22.08,0:04:24.37,Default,,0000,0000,0000,,The reverse is an interesting mechanism.
Dialogue: 0,0:04:24.62,0:04:28.06,Default,,0000,0000,0000,,Here, C5 is applied along with C3.
Dialogue: 0,0:04:28.22,0:04:31.78,Default,,0000,0000,0000,,So here, the carrier of\Nthe second set is stationary.
Dialogue: 0,0:04:33.03,0:04:36.96,Default,,0000,0000,0000,,This means that the planet gears of\Nthis set will not be able to revolve
Dialogue: 0,0:04:37.33,0:04:39.03,Default,,0000,0000,0000,,and that they will simply spin.
Dialogue: 0,0:04:40.16,0:04:43.04,Default,,0000,0000,0000,,This spin is in the same \Ndirection as the input.
Dialogue: 0,0:04:43.20,0:04:44.80,Default,,0000,0000,0000,,This planetary spin will make
Dialogue: 0,0:04:44.80,0:04:47.93,Default,,0000,0000,0000,,the corresponding sun gear spin\Nin the opposite direction.
Dialogue: 0,0:04:48.30,0:04:52.95,Default,,0000,0000,0000,,As a result, the output sun gear will\Nalso turn in the opposite direction
Dialogue: 0,0:04:52.95,0:04:54.81,Default,,0000,0000,0000,,and we will get the the reverse gear.
Dialogue: 0,0:04:55.70,0:04:59.36,Default,,0000,0000,0000,,We hope that you enjoyed the brilliance\Nof the Allison transmission mechanism.
Dialogue: 0,0:04:59.36,0:05:02.21,Default,,0000,0000,0000,,To make our free educational\Nservices sustainable,
Dialogue: 0,0:05:02.21,0:05:04.51,Default,,0000,0000,0000,,please support us at patreon.com.
Dialogue: 0,0:05:04.79,0:05:05.76,Default,,0000,0000,0000,,Thank you.