This kind of structure is to make the flower teeth with an inclined angle on the bearing surface of the nut. The anti-loosening principle is the inclination angle of the flower teeth of the bearing surface of the nut. When the nut is tightened, it is similar to a ratchet mechanism and is pressed into the contact surface. When the force is applied, the reverse movement is prevented, and the nut is not easy to loosen. The advantage is that the manufacturing cost is low; the disadvantage is that the anti-seismic performance is poor, and the anti-loosening effect can only be achieved when there is a pre-tightening force, and it will be embedded in the contact surface, which is not allowed in some occasions, such as appearance and surface protection.
The transmission negative wire and the battery negative wire are fixed on the vehicle body, and it is required to use a single M8 or two M6 bolts for fixing, and a single M6 bolt cannot be used for fixing.