How to choose ball bearing and roller bearing?

2. In fact, most of the foreign automotive bearings are mainly double-row angular touch ball bearings; most of the domestic use of roller bearings; the most basic reason is that the initial mass company entered the Chinese shopping mall; found that the domestic road conditions are not good; affected The service life of the bearing; only the roller bearing was selected.

3. So what is the ball bearing? Still good for roller bearings? Let's dissect their superior defects:
1) Ball bearing; Starting friction coefficient. Defect is not impact resistance; not suitable for messy road conditions. 2) Roller bearing; bearing load is line touch (difference to ball bearing point touch Strong resistance to impact; strong adaptability to the road. Therefore, there is a reputation of the masses of mulberry cars running across the country. But it is clear that the formation of the start and the sluggish lag; this will inevitably make everyone feel more dissatisfied with the sense of operation now. There is the addition of fuel consumption; although these are difficult to detect.