別擔心~
jacjan wrote:
我倒是不敢期望 jp 的半軸,
如果前後差改 locker 在100%的扭力下越野能撐多久..(恕刪)
http://www.awdwiki.com/en/torque+split+ratio/
To transfer torque from wheel to wheel you need a lockable differential installed in the axle. To be able to transfer 100% of torque to every single wheel, you need a fully lockable center differential and a fully lockable differential in each of the axles.
假設1. 除中差鎖外, 無其他任何限滑機制或前後差速鎖.
假設2. 打滑抓地趨近零 (如結冰路面或測試滾輪)
4H
無輪打滑 torque split 接近 47/53
前軸任一輪打滑 torque apportion 接近 100/0
後軸任一輪打滑 torque apportion 接近 0/100
4HL/4LL
無輪打滑 torque split 接近 47/53
前軸任一輪打滑 torque apportion 接近 0/100
後軸任一輪打滑 torque apportion 接近 100/0
如果現在再加入前後差速鎖,
前中後全上鎖,
三輪打滑剩下的一輪就是接近 100%
jp 改前後差速鎖其實意義不大,
因為原廠半軸的設計是用在 brake traction control 或 lsd 來分配左右扭力,
改成差速鎖, 一個抬腳觸地或爬石稍微久一點搞不好就是斷軸.
獨立懸吊要上前後差速鎖也不是不行,
只是半軸也要換成強化過的半軸.
如果是前軸, 轉向也要強化.
(直接換前後固定軸的車會快一點
)強化型前半軸 (非 jp)
http://www.thetruthaboutcars.com/2013/06/alphabet-soup-4x4-vs-4wd-vs-awd-wheres-the-differential/
(傳統的part time system. ex. wrangler rubicon)
Part time locking systems with a longitudinal layout
...
The systems are typically very rugged and if the system employs fully-locking axles on the front and rear power is exactly 25/25/25/25 percent wheel to wheel and if three wheels lost traction the remaining wheel can consume all 100% of available power.
...
http://www.motortrend.ca/en/enthusiast/feature/consumer/1105-4wd-vs-awd/all-wheel-drive.html
(這段在講用多板離合器的 subaru ats)
while the four-speed automatic uses a series of multi-clutch packs to continuously vary the front-to-rear split from 60/40 in normal driving to as much as 2/98 if more rear traction is needed
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