1 frame
ldquo;. Frame rdquo; ldquo name originally from French; Chassisrdquo; derived, used earlier car frame, a cage-like mostly the steel beam configuration, i.e. two parallel main beam, in a similar stepwise manner connected together about a number of manufactured sub-beams. Construction of the vehicle body on the frame, as a door, fender, hood, trunk lid and other sheet metal parts, is coated on the outside of an additional vehicle, so the vehicle body and the frame is actually in two separate structure. The greatest benefit of this design, is lightweight and rigid to be taking into account, and therefore are a lot of sports car manufacturer’s favor, this design early Ferrari and Lamborghini are used.
Since the steel must be designed coupling frame girders and the sub-beam through the plurality of contacts coupled with the cage structure can not make a large space, and therefore more complex to manufacture in addition, it is not conducive to mass production of in addition, it does not fit in the four-door car with emphasis on space. Then the frame structure of the monomer in the mainstream car scene, cage-like steel frame that is gradually replaced by the body and replaced by the frame combined frame monomer, such monomers car frame generally ldquo; chassis rdquo; termed, is derived from the English ldquo; Platformrdquo ;.
Design of the frame
To evaluate the quality of the frame design and configuration, the first should be clearly understood that a variety of vehicles traveling at different frame to bear of force. If the frame toughness in a certain area (stiffness) is poor, even if there is even the best suspension systems, can not achieve good control performance. The frame in the real world have to face four kinds of pressure.
1. Bending load
can literally this pressure is readily understood, by weight of the non-suspended part of the car (unsprungmass), is subjected by the frame, transmitted by the axleground. And this pressure, the main focus will be at the center of the wheelbase. Thus the bottom of the frame rails and cross members (member), generally requires a strong rigidity.
2. Non-twist level
After the rolling on the road currently experiencing uneven diagonal wheels, the frame beam will be subjected to the twisting longitudinal pressure (longltudinaltorsion), you will be the case if a twisted plastic sheet as helically.
3. Lateral bending
The so-called lateral bending, when the car is cornering inertia weight (i.e., centrifugal force) causes the vehicle body to the outside tendency rejection bend, while the tire grip the road surface reaction force and will, two strands laterally opposite pressure frame distortion.
4. Diamond twist level
Because the vehicle is traveling, because the wheels of each different road and driving conditions, (road paving, the undulating, angled out of the obstacle and the like) for each wheel will be subjected to different resistance and traction, which allows to generate a push-pull as well as deformation of the frame in the horizontal direction, if this situation will pull into a rectangle, like a diamond.
the frame is good or bad is not real physical indicators can be covered, so even if there are powerful new frame appears, the most traditional form of the frame still exists, because of this, only the following content publishing meaning.
on a rigid frame
Many people are aware rigid good or not will directly affect a car’s handling, but the so-called frame rigidity really mean What is? What are the consequences of rigidity and lack of will to bring it? Briefly, the required rigidity of the frame construction of fact in the resistance to deformation of the frame, i.e. the frame means for receiving an external force and resistance to bending or twisting. Once the frame rigidity insufficient, handling will be affected. Imagine the front frame due to deformation caused by the time difference, or ground of the tire and the road to the adverse affect of tracking and grip the steering and so on, will make sure maneuverability can not play the original level.
Effect rigid external frame, usually produced when the G value from the road friction or deceleration and cornering. Since the early automotive engine and chassis design than it is today developed, tire grip alsoNot as good today, so the importance of frame rigidity is not easy to be concerned about. However, in recent years, the market vehicle mounted engine has good power, many cars have 200km / h or more of the speed, and in addition to the tire grasping evolve into better radiating layer structure fertility, low-profile than the large diameter of the eggshell the set also become the mainstream of the market, and therefore has improved in power, and in the case of the tire increases the load on the suspension and transferred to the frame, the load on the frame itself will surely be a substantial increase, while the frame rigid good or it is even more important.