unsprung mass, is a word came into English, English: Unsprung Weight. It refers to a non supported by the vehicle suspension system weight: tires, wheels, brakes. Appropriate, Sprung Weight (sprung mass) refers to a suspension system to support the weight of the car, it is the quality of the vast majority of cars, comprising a frame, a power system, transmission device, an occupant and the like. Distinguish and recognize both unsprung mass, both sprung mass, it has great significance for the stability and handling of a car. Printing of rumors: 1KG reduce the unsprung mass may be equivalent to reduce the effectiveness of the sprung mass of 15KG. Of course, then the data is not necessarily accurate, but the effect and the impact it is. In the case of the sprung mass unchanged, reducing the unsprung mass can enhance the car’s acceleration, handling and stability to some extent. .
1 unsprung mass nouns interpretation
unsprung mass, is a word came into English, English: Unsprung Weight. It refers to a non supported by the vehicle suspension system weight: tires, wheels, brakes. Appropriate, Sprung Weight (sprungQuality) refers to a suspension system to support the weight of the car, it is the quality of the vast majority of cars, comprising a frame, a power system, transmission device, an occupant and the like. Distinguish and recognize both unsprung mass, both sprung mass, it has great significance for the stability and handling of a car. Printing of rumors: 1KG reduce the unsprung mass may be equivalent to reduce the effectiveness of the sprung mass of 15KG. Of course, then the data is not necessarily accurate, but the effect and the impact it is. In the case of the sprung mass unchanged, reducing the unsprung mass can enhance the car’s acceleration, handling and stability to some extent.
2. The principle of unsprung mass
As we all know, a car accelerates from rest to start the process requires a lot of energy. And let the tires do not move from place to scroll up also requires a lot of energy, the heavier the tire, the greater the energy required. Thus, the weight of the tire (or wheel) is reduced, thus reducing the required power, it can enhance acceleration. When
On the other hand, the tire (or wheel) to reduce the weight, inertia also becomes small, uneven surfaces encountered potholes on the fast reaction of the corresponding (not discussed suspended, of course, influence is great), stability and handling will naturally rise.
binding sprung mass, such a simple formula: (sprung weight) / (unsprung weight) = substantially the better.
Since the ground pressure of the tire is provided by the weight of the vehicle, if the vehicle is heavy, can be ground natural ground tirePressure increased, but when pressed against the rough road, the tire would have a mass of the moving speed of the upper and lower suspension greatly affected, the greater the unsprung mass, the longer needs to be changed (in a fixed time to do moving direction suspension set it) will result in reduced performance on the road undulating track, if the small body weight, you can not effectively suspended the fulcrum effective fixed position relative to the ground, so that, when the tire has no chance when moved to an appropriate degree of ups and downs ground, the body would float up.
3. Unsprung mass application
In certain unsprung mass, we need to reduce the unsprung mass as possible. For example, independent suspension unsprung mass it is lighter than non-independent suspension frame, so it’s better handling stability. As another example lightweight aluminum alloy wheels, and a suspension element (tie rod, rocker arm, etc.) and the like can also reduce the unsprung mass, in order to increase the handling and acceleration performance of the vehicle.
4. Effects of unsprung mass of the vehicle
● affect the comfort of the unsprung mass
(1) When the vehicle traveling road, the suspension system continuously receiving the impact from the road surface, the vehicle occupant in the best comfortable state, it is the body always remains stationary relative to the road, the wheel with the road conditions continued ups and downs, but want to do it is almost impossible by the mechanical structure, but by increasing the ratio of unsprung mass of the sprung , the vehicle can travel closer to this state.
(2) If the sprung mass is large, it will increase the pressure of the wheel on the ground, the wheels will be a snug fit road. When the wheel encounters projections or recesses from the road, it will naturally have more inertia, the greater the amplitude of fluctuation. The faster the speed, the impact on the body caused by the more obvious, in terms of occupant the more uncomfortable. One example can explain this phenomenon, when faced with a big obstacle, slow traffic significantly better than the speedy passage of ride comfort, it is because a lower speed by a suspension system to leave more ups and downs of exercise time to reduce the impact on occupant comfort.
(3) reducing the unsprung mass, such that the body can be more stable, can greatly enhance the comfort of the occupant. Therefore, from the structural point of view, independent unsprung mass suspension to the suspension frame is lighter than the non-independent, so it is better handling stability.
● affect the unsprung mass of the vehicle acceleration and handling of the
If the car compared to sprinters, then spring under the quality is his running shoes, shoes lighter, but also athletes run faster. Can effectively reduce the unsprung mass of the vehicle by replacing lightweight aluminum alloy wheels, and a suspension element (tie rod, rocker arms, etc.) to achieve the lifting and handling of the vehicle acceleration performance.