Product information
*Even within the same vehicle model, compatibility may vary depending on the grade and year. Additionally, separate parts may be required for installation. For detailed compatibility information, please be sure to check the following:HerePlease check further.
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Click here for the Motion Control Beam FAQ page >>>
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The front and rear ends of the body are reinforced to increase torsional rigidity. By damping body vibrations caused by the increased rigidity with ultra-high damping friction dampers, a street-optimized ride quality is created that is both strong and flexible. Sold as a set of two (front and rear).>>Learn more
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The body ends are reinforced to increase torsional rigidity.
Motion control beam with built-in friction-type vibration damping damper.
For those who want to actively enjoy driving, a stronger body is preferable. This is because road surface inputs can cause the body to flex, hindering the suspension's movement. Of course, mass-produced car bodies are evolving year by year and have sufficient rigidity for normal driving, but there is still room for improvement in rigidity to fully experience a sense of unity with the car. That's why we have explored the weak points of mass-produced bodies and built a lineup ranging from strut tower bars to full-fledged brace kits, aiming for a perfectly rigid body.
To further enhance the design, the focus shifted to reinforcing the front and rear ends of the body, which are effective against torsion. Compared to the cabin in the center of the body where the monocoque is formed, the front and rear ends are basically constructed of two rectangular closed-section side frames arranged vertically, similar to the ladder frame used in trucks, with only reinforcement added. Moreover, these areas are also where the suspension, which is subjected to heavy loads, is mounted, making them more prone to torsion than the center of the body. Reinforcing these areas would make it possible to create a more robust body.
We previously developed a product called a frame end brace. Its structure completely rigidifies the frame by fastening a square shape with a high-rigidity steel oval pipe. When combined with strut tower bars and floor crossbars, it significantly improves torsional rigidity. However, as the body approaches perfect rigidity, subtle vibrations from the road surface that cannot be absorbed by the suspension, tires, and rubber bushings become more easily transmitted. This tendency is particularly noticeable in the latest Mazda vehicles, which have high body rigidity.
To address this issue, the "Motion Control Beam (MCB)" was developed.*1To maximize rigidity while suppressing micro-vibrations, the conventional steel oval shaft was replaced with an ultra-high damping friction damper. The internal structure is a simple mechanical configuration of disc springs and friction plates, as shown in the "MCB Internal Structure (Conceptual Diagram)".
First, body rigidity is ensured by the tension of robust disc springs with a spring constant more than 100 times that of suspension springs. Then, vibrations are dampened by the elastic and frictional forces of friction plates from the moment the body begins to vibrate. The amount of this stroke is only about 4um (=0.004mm) in a scenario where a driver enjoying driving is speeding through winding roads (0.5G). This is a minute value that cannot be detected by measuring instruments, but people can perceive this difference as a difference in "driving feel". For this reason, we continue to be committed to "sensory tuning" that does not appear in specifications. We are expanding our lineup with new items that possess both strength and flexibility. We would like you to experience the effect for yourself.