Nov. 11, 2020
In daily life, we will find that some of the fastening screws on the wheel are 4 or 5 or more. So how is the number of fastening screws determined? If based on the concept of quantity, some people may think that 4 screws are not as safe as 5 screws. They think that the more screws, the safer, and the faster they can run. Is this really the case? There are two ways to fix tires: tire bolts and tire nuts. How do you choose in car design? The license plate frame supplier shares this article for you.
First of all, it is not that the more car Wheel screws, the higher the safety. The car will go through rigorous fatigue tests, bench tests, road tests, and other test items before leaving the factory, so whether it is 4 screws or 5 screws Will not affect driving safety! Like F1, it only uses 1 screw for the convenience of tire replacement, but it is absolutely safe to run at speeds of more than 300 kilometers per hour!
Generally, four fixing screws will appear on cars with around 100,000 or less, such as mpv Wuling Hongguang, and SUVs generally have 5 fixing screws. The number of screws is related to the weight and load of the vehicle to a certain extent. The car is heavy. If the number of screws is small, the force shared by each screw will be large. Then, a screw with a thicker diameter must be used to meet the demand, but the appearance of four thick screws is not as good as that of five thinner screws. much better.
For example, the sacred car Wuling Zhiguang and Chery Little Ant are the typical round four screws, and even the older Nissan cars are almost all designed with four screws. In the application of nuts, the choice of nuts is also closely related to the bolt structure. Hub screws are divided into spherical and conical surfaces. The screw cut surface must match the hub. When the contact surface of the hub is a conical surface, you cannot choose a spherical screw. This will reduce the contact surface and cause uneven force. Lead to great safety risks.
Car Wheel Screws
If the car is heavy, the lateral force received when turning or when the force on the uneven road surface is uneven will be large and uneven. The large load is the same as the weight of the car. At this time, 5 screws will share a certain bearing force. It is better to share than 4 screws. The number of screws is related to the weight and load of the vehicle to a certain extent. The car is heavy. If the number of screws is small, the load shared by each screw will be very large. Then a screw with a larger diameter must be used to meet the bearing demand. Therefore, if the car is heavy, the force will be uneven when turning or on uneven roads. Under the circumstance, the lateral force received will be large and uneven. The large load is the same as the weight of the car. At this time, 5 screws will share a certain bearing force than 4 screws.
SUVs are usually five connecting points. After all, they have to traverse the natural and rugged terrain and pay attention to the weight. The tires rely on the wheel hub, that is to say, no matter how powerful the power system is, it will ultimately output all the power from the half shaft to the wheel hub, and the hub bolt is the way of transmission. It can be said that the design and verification here are sloppy. , So everyone does not have to worry about issues other than the quality of the parts.
The price of tires of some models is high, and tires have been stolen. For example, the tires of WEY vv7 have been stolen. Therefore, we will make safety and anti-theft designs in the screws. The anti-theft screw is a keyhole, and you must have a corresponding key. The lock is open. Generally speaking, as long as one of the 4 to 5 screws on a wheel hub is a special anti-theft screw, the safety of the vehicle can be protected.
The application of fasteners and the platformization of major OEMs are also closely related. Generally, the strength level of No. 2 bolts is around 10.9, while the strength level of No. 4 bolts on the Volkswagen PQ35 platform is around 8.8, so No. 2 bolts use 4 One is enough as a fixing screw, and the Volkswagen PQ35 screw needs to use five to reach a certain strength level to ensure safety!
However, the design of racing cars is different from ordinary cars. They may not even use 4 screws to reduce the weight of the wheels. Because even 0.5kg has an immeasurable impact on the speed of the car and the result of the race. Therefore, in the eyes of professional racers and modification enthusiasts, the original screw of the wheel hub is a piece of fat that has to be cut off.
A car of about 100,000 yuan generally does not weigh much, and it is impossible to let it carry heavy loads, so 4 screws are enough. And it has a certain relationship with the model level. Medium-sized cars cannot have 4 screws, while small cars and compact cars generally have 4 screws!