請問minimum tire scrub 是什麼意思????
請問minimum tire scrub (during cornering)是什麼意思??
- DaSaGwaLv 78 years agoFavorite Answer
This is a terminology for wheel alignment. The minimum tire scrub is the minimum " scrub radius " (as describe below) for the alignment of the wheel, so that during corning, you can have better control of the vehicle.
Scrub radius is the distance between where the SAI intersects the ground and the center of the tire. This distance must be exactly the same from side to side or the vehicle will pull strongly at all speeds. While included angle problems will affect the scrub radius, it is not the only thing that will affect it. Different wheels or tires from side to side will cause differences in scrub radius as well as a tire that is low on air. Positive scrub radius is when the tire contact patch is outside of the SAI pivot, while negative scrub radius is when the contact patch is inboard of the SAI pivot (front wheel drive vehicles usually have negative scrub radius).If the brake on one front wheel is not working, with positive scrub radius, stepping on the brake will cause the steering wheel to try to rip out of your hand. Negative scrub radius will minimize that effect.Scrub radius is designed at the factory and is not adjustable. If you have a vehicle that is pulling even though the alignment is correct, look for something that will affect scrub radius.
Steering Axis Inclination (SAI)
SAI is the measurement in degrees of the steering pivot line when viewed from the front of the vehicle. This angle, when added to the camber to form the included angle (see below) causes the vehicle to lift slightly when you turn the wheel away from a straight ahead position. This action uses the weight of the vehicle to cause the steering wheel to return to the center when you let go of it after making a turn. Because of this, if the SAI is different from side to side, it will cause a pull at very slow speeds. Most alignment machines have a way to measure SAI; however it is not separately adjustable.
2012-03-13 23:57:33 補充：
The most likely cause for SAI being out is bent parts which must be replaced to correct the condition. SAI is also referred to as KPI (King Pin Inclination) on trucks and old cars with king pins instead of ball joints.
2012-03-14 06:37:09 補充：
I learn everything by heart, never with formula or rules. After all, my brain doesn't have gazillion bytes memory!
2012-03-14 06:38:06 補充：
I kind of admire those people who can remember all kind of formula and rules. How can they do that?
2012-03-14 09:50:12 補充：
Wow!, I thought Yugo is extinct. You still have one is really amazing.
2012-03-15 13:03:24 補充：
As an amateur mechanics, I think I will stay away from Yugo. After all it named you "go" not it "go". I take that as "you walk and it stays".Source(s): self and internet for the drawing
- 阿昌Lv 78 years ago
minimum tire scrub (during cornering)
- 河小豚Lv 78 years ago
minimum tire scrub最小的輪胎磨砂膏(during cornering)（在彎道）
- prisoner26535Lv 78 years ago
Melon dude must have learned the Lambo's SAI by heart.
2012-03-14 09:29:46 補充：
Alright, Lambo lover - how about the SAI of my 1988 Yugo?
2012-03-14 20:03:27 補充：
Nope, Yugo was still in production till the 2008 down turn - you just need to know where to find.
Psst - do you want to buy a nice used Yugo? Or Brooklyn bridge I have too...
2012-03-17 08:53:45 補充：
A Yugo or amego, could be a good go if you take good care of it.