驅動軸有問題， 不能忽視的征兆（答southmountainer網友）

驅動軸斷掉是非常危險的，我個人的主張是遵循古人的智慧，防患於未然。車軸斷之前很長時間就應該有一些征兆，一定不能忽視。

southmountainer 網友問， 能講講有什麽樣的征兆？ 為什麽有這些征兆嗎？

先聲明，壇裏除了兩位版主，還有許多高手，都有專業級別的水平，我自認為也就是業餘小打小鬧，連正時皮帶都不敢自己換。所以問我問題，得到的答案很可能不正確或不全麵，先交代清楚了，我下邊好吹 ：－）

其實自己也吹不出什麽來，偉大的股溝是咱的堅強後盾，我就股溝： Symptoms of Drive Shaft Problems，找來幾個供大家參考，歡迎補充。

A vehicle's drive shaft--the rotating object located between the differentials and gear box--helps it switch from idle to drive; without it, a vehicle would never move. Usually, a drive shaft does not fail instantaneously, and deterioration happens over time. Accordingly, if drive shaft problems are recognized early, you can avoid costly repairs. There are various symptoms that indicate if your vehicle's drive shaft is faulty.

Vibration
 
A damaged drive shaft can cause the vehicle to vibrate. The entire vehicle or parts of it--especially the floorboards--may shake and tremble, and the vibration will often intensify and worsen at increased speed. Severe vibrations can also indicate a bad tire; however, vibrations from tire problems usually happen during acceleration, whereas drive shaft problems cause vibration when the vehicle is moving or stationary.
 

Sounds
 
A vehicle may emit noises if the drive shaft is bad. You may hear a low squeaking sound that intensifies with increases in speed. The sound may completely disappear when traveling at higher speeds and reappear as the vehicle decelerates. This is often the result of a severely damaged U-joint, a part connected to the drive shaft.
 

Turning Issues
 

A drive shaft problem can prevent your vehicle's wheels form turning properly. You may notice that the wheels hesitate when you turn a corner. You may feel resistance from the tires when making sharp turns or U-turns. You might also experience parking problems while trying to maneuver the wheels to turn into tight spaces.
 

Universal Joint Movement
 

A U-joint, or universal joint, that moves too much or does not rotate at all can indicate a drive shaft problem. To inspect the U-joint, set the parking brake and shift the vehicle into neutral. Move the yokes of the U-joint back and forth to check for flexibility. If there is excess movement in any direction, the U-joint is unstable and could negatively affect the drive shaft. Also, visible rust on the bearing cap seals surrounding the U-joint can indicate a drive shaft problem.

總之，在沒有一點征兆的前提下，驅動軸突然斷掉的情況，我不敢說沒有，但可以說可能性很小，接近於零。希望大家不做車盲，平時好好學習，認真維護保養自己的汽車，才能極大限度地保證行車安全，避免車毀人亡。