Arc grooves on the lower plane of the brake disc are uniformly distributed, and the inner ends of the vent holes corresponding to the arc grooves are communicated with the arc grooves.
在刹车盘下平面有弧形槽，弧形槽均匀分布。与弧形槽相对的通风孔内端与弧形槽连通。
2
The inner ends of the vent holes corresponding to the grooves are communicated with the grooves.