Harm unsprung weight and the use of forged wheels
We know that the lighter the car, the better. And gasoline less care, and general life becomes more joyful and carefree. But few know that the mass of the mass of discord. There sprung mass - that's all "lies" in the suspension and it is perceived. Unsprung same - it ourselves wheels with tires, hubs and brake drums and discs with calipers. It must be said that international standards in determining the sprung-unsprung masses do not always converge. In particular, according to the German standard DIN, to the unsprung masses are more and suspension parts: levers, springs and springs with shock absorbers. What, in general, it is logical. But torsion bars - it is sprung. But most interesting is that the stabilizer bar came out perfect outcast - half of it sprung mass and the other not. Therefore, for each model to identify the ratio of the masses can only be on special stands, resorting to complex calculations. Why do it?
The fact that the most important - is the ratio of the sprung and unsprung masses. From him, for example, depends on a smooth ride. The more unsprung weight, the worse smoothness. That is why the old machine to the heavy wheels and pivot suspensions this very smooth no different. The familiar, probably, a lot of pictures, as soon as the trunk was well loaded - Ride increases. This is due to changes in the ratio of sprung and unsprung masses.
Probably do not need to be Einstein to understand the effect of inertial forces on the car. It is to them we owe all kinds of drifts and drifts. But it is important not only that. The more unsprung weight, the more details on the inertial force. Let's say you move on to the dependent elderly SUV rear axle, where the massive gearbox, axis and hub rather big wheels. When traveling corrugated section of the road it will be appreciated that the rear axle is constantly slipping away. All because the rear axle under the influence of inertial forces simply do not always have time to come back down. From this grip will deteriorate, and the axis will start to "walk". These inertial forces impede effective brakes with heavy wheels. Yes, and accelerate such difficult. Because something essential in the harsh off-road SUVs old school with heavy axle suspension on highways clearly losing on new arms and hubs of light alloys.
It turns out that by changing the weight ratio can be increased smoothness. And then there are two ways. You can increase the sprung, for example, to drive a ballast in the trunk, losing in fuel consumption and dynamics. And it is possible to reduce the unsprung. And it's much more interesting. It was then that we can help forged wheels, the weight of each of which may differ by more than 10 kilograms compared with the casting. Furthermore, they are much stronger than that of ordinary steel or cast. And still their main mass is concentrated closer to the hub, which reduces the moment of inertia. Simply put, the inertial forces acting on the untwisted forged wheel, much less prevent it from moving progressively, ie in the direction that we want. It turns out that looking car ads, do not skeptical about the "pereobutsya" forged wheels in the lot. Against the physicists do not trample. It is better to be friends with her.
We know that the lighter the car, the better. And gasoline less care, and general life becomes more joyful and carefree. But few know that the mass of the mass of discord. There sprung mass - that's all "lies" in the suspension and it is perceived. Unsprung same - it ourselves wheels with tires, hubs and brake drums and discs with calipers. It must be said that international standards in determining the sprung-unsprung masses do not always converge. In particular, according to the German standard DIN, to the unsprung masses are more and suspension parts: levers, springs and springs with shock absorbers. What, in general, it is logical. But torsion bars - it is sprung. But most interesting is that the stabilizer bar came out perfect outcast - half of it sprung mass and the other not. Therefore, for each model to identify the ratio of the masses can only be on special stands, resorting to complex calculations. Why do it?
The fact that the most important - is the ratio of the sprung and unsprung masses. From him, for example, depends on a smooth ride. The more unsprung weight, the worse smoothness. That is why the old machine to the heavy wheels and pivot suspensions this very smooth no different. The familiar, probably, a lot of pictures, as soon as the trunk was well loaded - Ride increases. This is due to changes in the ratio of sprung and unsprung masses.
Probably do not need to be Einstein to understand the effect of inertial forces on the car. It is to them we owe all kinds of drifts and drifts. But it is important not only that. The more unsprung weight, the more details on the inertial force. Let's say you move on to the dependent elderly SUV rear axle, where the massive gearbox, axis and hub rather big wheels. When traveling corrugated section of the road it will be appreciated that the rear axle is constantly slipping away. All because the rear axle under the influence of inertial forces simply do not always have time to come back down. From this grip will deteriorate, and the axis will start to "walk". These inertial forces impede effective brakes with heavy wheels. Yes, and accelerate such difficult. Because something essential in the harsh off-road SUVs old school with heavy axle suspension on highways clearly losing on new arms and hubs of light alloys.
It turns out that by changing the weight ratio can be increased smoothness. And then there are two ways. You can increase the sprung, for example, to drive a ballast in the trunk, losing in fuel consumption and dynamics. And it is possible to reduce the unsprung. And it's much more interesting. It was then that we can help forged wheels, the weight of each of which may differ by more than 10 kilograms compared with the casting. Furthermore, they are much stronger than that of ordinary steel or cast. And still their main mass is concentrated closer to the hub, which reduces the moment of inertia. Simply put, the inertial forces acting on the untwisted forged wheel, much less prevent it from moving progressively, ie in the direction that we want. It turns out that looking car ads, do not skeptical about the "pereobutsya" forged wheels in the lot. Against the physicists do not trample. It is better to be friends with her.
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