[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.64,0:00:03.86,Default,,0000,0000,0000,,Torsen is a trademark of \Nthe JTEKT Corporation.
Dialogue: 0,0:00:06.65,0:00:10.09,Default,,0000,0000,0000,,The Torsen differential has \Nmany patented components
Dialogue: 0,0:00:10.09,0:00:15.24,Default,,0000,0000,0000,,and is the most unique and ingenious\Nmethod of providing differential action
Dialogue: 0,0:00:15.24,0:00:18.16,Default,,0000,0000,0000,,while overcoming the traction\Ndifference problem.
Dialogue: 0,0:00:24.95,0:00:27.98,Default,,0000,0000,0000,,The internal components of \Na Torsen are quite different
Dialogue: 0,0:00:27.98,0:00:30.41,Default,,0000,0000,0000,,from that of a conventional differential.
Dialogue: 0,0:00:31.82,0:00:36.13,Default,,0000,0000,0000,,At the heart of the system lies \Na specially shaped gear pair assembly.
Dialogue: 0,0:00:39.34,0:00:43.12,Default,,0000,0000,0000,,Let's see the cross-sectional shape \Nof these gears at the mating point.
Dialogue: 0,0:00:45.78,0:00:49.11,Default,,0000,0000,0000,,As can be seen one gear is a spur gear
Dialogue: 0,0:00:49.28,0:00:51.53,Default,,0000,0000,0000,,and the other one is a worm gear.
Dialogue: 0,0:00:53.15,0:00:58.09,Default,,0000,0000,0000,,A Torsen works on the simple principle\Nof worm gear worm wheel.
Dialogue: 0,0:00:59.72,0:01:02.86,Default,,0000,0000,0000,,That is, a spinning worm gear \Ncan rotate the wheel.
Dialogue: 0,0:01:04.66,0:01:07.91,Default,,0000,0000,0000,,But the rotating wheel cannot \Nspin the worm gear.
Dialogue: 0,0:01:10.40,0:01:13.78,Default,,0000,0000,0000,,Throughout this discussion just \Nkeep this principle in mind.
Dialogue: 0,0:01:15.68,0:01:18.96,Default,,0000,0000,0000,,A pair of such worm wheels \Nare fitted with the case.
Dialogue: 0,0:01:26.04,0:01:30.65,Default,,0000,0000,0000,,So the engine power received by the case\Nis transferred to the worm wheels.
Dialogue: 0,0:01:34.88,0:01:38.21,Default,,0000,0000,0000,,Each end of the wheels \Nis fitted with a spur gear.
Dialogue: 0,0:01:42.25,0:01:45.18,Default,,0000,0000,0000,,Now let's consider different \Ndriving scenarios.
Dialogue: 0,0:01:46.41,0:01:48.25,Default,,0000,0000,0000,,When the vehicle moves straight,
Dialogue: 0,0:01:48.92,0:01:52.11,Default,,0000,0000,0000,,the worm wheels will push \Nand turn the worm gears.
Dialogue: 0,0:01:52.46,0:01:56.32,Default,,0000,0000,0000,,So both the drive wheels \Nwill rotate at the same speed.
Dialogue: 0,0:01:57.17,0:01:59.100,Default,,0000,0000,0000,,Please note here that, in this condition,
Dialogue: 0,0:01:59.100,0:02:03.13,Default,,0000,0000,0000,,the worm wheels do not spin on its own axis.
Dialogue: 0,0:02:04.06,0:02:08.36,Default,,0000,0000,0000,,In this condition the whole mechanism \Nmoves as a single solid unit.
Dialogue: 0,0:02:10.88,0:02:13.66,Default,,0000,0000,0000,,When the vehicle is negotiating a right turn
Dialogue: 0,0:02:13.77,0:02:17.56,Default,,0000,0000,0000,,the left wheel needs to rotate at \Na higher speed than the right wheel.
Dialogue: 0,0:02:19.45,0:02:23.28,Default,,0000,0000,0000,,This speed differential is perfectly \Nsupported in the Torsen.
Dialogue: 0,0:02:25.08,0:02:27.84,Default,,0000,0000,0000,,The worm gear of the faster left axle
Dialogue: 0,0:02:27.84,0:02:31.63,Default,,0000,0000,0000,,will make the corresponding \Nworm wheel spin on its own axis.
Dialogue: 0,0:02:36.45,0:02:39.26,Default,,0000,0000,0000,,On the other side, relative to the case,
Dialogue: 0,0:02:39.26,0:02:42.88,Default,,0000,0000,0000,,the slow right axle is turning \Nin the opposite direction.
Dialogue: 0,0:02:52.04,0:02:56.27,Default,,0000,0000,0000,,Thus the right worm wheel will \Nspin in the opposite direction.
Dialogue: 0,0:03:05.24,0:03:08.44,Default,,0000,0000,0000,,The meshing spur gears at \Nthe ends of the worm wheel
Dialogue: 0,0:03:08.57,0:03:12.41,Default,,0000,0000,0000,,will make sure that the worm wheels\Nare spinning at the same speed.
Dialogue: 0,0:03:14.69,0:03:18.02,Default,,0000,0000,0000,,Thus it guarantees a perfect \Ndifferential action.
Dialogue: 0,0:03:23.49,0:03:25.33,Default,,0000,0000,0000,,Now let's try to understand how
Dialogue: 0,0:03:25.33,0:03:29.37,Default,,0000,0000,0000,,the Torsen overcomes the drive \Nwheel traction difference problem.
Dialogue: 0,0:03:29.91,0:03:31.38,Default,,0000,0000,0000,,As you might be aware,
Dialogue: 0,0:03:31.38,0:03:34.66,Default,,0000,0000,0000,,when your vehicle encounters \Na situation as shown,
Dialogue: 0,0:03:34.66,0:03:37.60,Default,,0000,0000,0000,,the slippery wheel starts \Nto spin very rapidly
Dialogue: 0,0:03:38.02,0:03:40.54,Default,,0000,0000,0000,,and will draw the majority \Nof the engine's power.
Dialogue: 0,0:03:42.95,0:03:45.74,Default,,0000,0000,0000,,As a result the vehicle will get stuck.
Dialogue: 0,0:03:48.39,0:03:51.83,Default,,0000,0000,0000,,But, if a Torsen differential \Nis used in this case,
Dialogue: 0,0:03:52.08,0:03:55.37,Default,,0000,0000,0000,,as soon as the slippery wheel \Nstarts to spin excessively,
Dialogue: 0,0:03:55.71,0:03:58.62,Default,,0000,0000,0000,,the speed change will be transferred\Nto the worm wheel.
Dialogue: 0,0:03:59.29,0:04:03.53,Default,,0000,0000,0000,,The right worm wheel transfers \Nthe speed change to the left worm wheel
Dialogue: 0,0:04:03.80,0:04:06.50,Default,,0000,0000,0000,,since they are connected through spur gears.
Dialogue: 0,0:04:07.24,0:04:09.02,Default,,0000,0000,0000,,Here comes the tricky part.
Dialogue: 0,0:04:09.28,0:04:14.36,Default,,0000,0000,0000,,The left side worm wheel will not be able \Nto turn the corresponding worm gear
Dialogue: 0,0:04:14.36,0:04:19.32,Default,,0000,0000,0000,,because, as we said, a worm wheel\Ncannot drive a worm gear.
Dialogue: 0,0:04:21.52,0:04:24.57,Default,,0000,0000,0000,,As a result the whole mechanism gets locked
Dialogue: 0,0:04:24.60,0:04:27.62,Default,,0000,0000,0000,,and the left and right wheels turn together.
Dialogue: 0,0:04:28.03,0:04:33.02,Default,,0000,0000,0000,,This allows a large amount of torque to \Nbe transferred to the high traction wheel
Dialogue: 0,0:04:33.28,0:04:37.18,Default,,0000,0000,0000,,and the vehicle can thereby overcome\Nthe traction difference problem.
Dialogue: 0,0:04:40.12,0:04:44.04,Default,,0000,0000,0000,,To carry the load, two more \Nworm wheel pairs are added.
Dialogue: 0,0:04:48.08,0:04:50.74,Default,,0000,0000,0000,,If you are familiar with the other\Ncommon technologies
Dialogue: 0,0:04:50.74,0:04:53.46,Default,,0000,0000,0000,,used to overcome the traction \Ndifference problem,
Dialogue: 0,0:04:53.73,0:04:56.56,Default,,0000,0000,0000,,you might have noticed a great\Nadvantage of the Torsen.
Dialogue: 0,0:04:57.82,0:05:00.42,Default,,0000,0000,0000,,While the other technologies\Nallow the drive wheel
Dialogue: 0,0:05:00.42,0:05:03.72,Default,,0000,0000,0000,,to slip for a limited amount of \Ntime before it gets locked,
Dialogue: 0,0:05:03.83,0:05:07.04,Default,,0000,0000,0000,,in Torsen, the locking action \Nis instantaneous.
Dialogue: 0,0:05:07.80,0:05:11.80,Default,,0000,0000,0000,,That means, as soon as the vehicle \Nencounters a traction difference track,
Dialogue: 0,0:05:12.14,0:05:13.63,Default,,0000,0000,0000,,the wheels will get locked.
Dialogue: 0,0:05:14.91,0:05:18.17,Default,,0000,0000,0000,,To know more about\Nthe clutch pack LSD technology,
Dialogue: 0,0:05:18.17,0:05:20.07,Default,,0000,0000,0000,,please check the next video.
Dialogue: 0,0:05:20.35,0:05:21.34,Default,,0000,0000,0000,,Thank you!