Reinforces the end of the body to increase torsional rigidity.
Built-in friction type vibration damping damper, motion control beam.

The stronger the body, the better to enjoy driving positively.The reason is that the input from the road surface distorts the body and hinders the movement of the suspension ... Of course, the body of mass-produced cars has evolved year by year and has sufficient rigidity for normal driving, but the car There is a lot of room for increased rigidity in order to fully enjoy the sense of unity with.Therefore, we have searched for the weak points of mass-produced bodies, and have accumulated a lineup aiming for a perfect rigid body from strut tower bars to full-scale brace kits.
Aiming for further deepening, we focused on reinforcement of the front and rear ends, which is effective against twisting of the body.Compared to the cabin in the center of the body where the monocoque is formed, it is basically composed of two "R" -shaped closed cross-section side frames laid out in the vertical direction, like the ladder frame used for trucks. , Lean force is only distributed.Moreover, since there is a suspension mounting part where a large load is applied, it is easier to twist than the central part of the body.If we can reinforce this, a stronger body can be realized.

We have previously developed a product called Frame End Brace.The structure is completely rigid by fastening the square shape with a high-rigidity steel oval pipe.By combining it with a strut tower bar or floor cross bar, the torsional rigidity has been greatly improved.However, as the body approaches a perfectly rigid body, micro-vibrations from the road surface that cannot be absorbed by the suspension, tires, and rubber bushes are more likely to be transmitted.This tendency tends to be seen especially in the latest Mazda cars, which have higher body rigidity.
The "Motion Control Beam (MCB)" was developed to solve this problem.※ 1".In order to suppress slight vibration while increasing the rigidity to the limit, the part where the steel oval shaft was used was changed to a friction type damper with ultra-high damping.The inside is a simple mechanical configuration with a disc spring and a friction plate as shown in "MCB internal structure (conceptual diagram)".

※ 1 MCB® is a registered trademark of Aisin Co., Ltd.
 

First, the body rigidity is ensured by the tension of a tough disc spring that has a spring constant of 100 times or more that of the suspension spring.Then, vibration is suppressed by the elastic force and frictional force of the friction plate from the stroke range at the moment when the body is about to vibrate.The stroke amount is only about 0.5um (= 4mm) in a scene (0.004G) where a driver who enjoys driving runs through the winding at a high pace.Although it is a minute numerical value that cannot be detected by a measuring instrument or the like, people judge the difference as a difference in "ride taste".Therefore, we continue to stick to "Kansei tuning" that does not appear in the specifications.The lineup of new items with strength and suppleness is being expanded.I want you to experience the effect.

 

Twisting mechanism

For example, the right front wheel has the largest load when entering the left corner.On the other hand, it is the left rear wheel on the diagonal that reduces the load most.After passing the clipping point and depressing the accelerator to accelerate, the load on the right rear wheel increases and the load on the left front wheel decreases.By repeating deceleration → acceleration, the load on the diagonal increases and decreases, and the diagonal also changes, causing the body to be twisted finely.

MCB damping mechanism

The hard resin friction plate used in the MCB is like a hardened eraser, and it suppresses vibration in two stages: a minute stroke range and a stroke range beyond that.

① Microstroke area
The friction plate itself is deformed with respect to the input.At the same time, the elastic force that tries to return to the original shape works, and it becomes the first vibration damping function.

② Further stroke range
When the input of ① or more is applied to the friction plate, the friction plate slides and friction is generated between it and the case.This is the second damping function.

<Motion Control Beam (MCB) Development Story ... What's New BLOG>

<Product compatibility table>

■ Motion Control Beam Set for one front and rear

Car name適合 車 種part numberTax-included price
(Price without tax)
Spec.CodesReference work
Time
RX-8SE3P-300001 ~MSE4900¥99,000
(¥ 90,000)
Friction type damper + steel shaft with dedicated mounting bracketE1.5 h
RX-7FD3S-500001 ~MFD4900¥104,500
(¥ 95,000)
Friction type damper + steel shaft with dedicated mounting bracketE2.0 h
RoadsterAll ND series cars


NCEC
MND4900


MSE4900
¥99,000
(¥ 90,000)

¥99,000
(¥ 90,000)
Friction type damper + steel shaft with dedicated mounting bracketE1.5 h
MAZDA2 / DemioDJ 2WD carMDJ4900¥104,500
(¥ 95,000)
Friction type damper + steel shaft with dedicated mounting bracketE1.5 h
MAZDA3All BP series carsMBP4900A¥104,500
(¥ 95,000)
Friction type damper + steel shaft with dedicated mounting bracketE1.0 h
AxelaAll BM series carsMKF4900¥104,500
(¥ 95,000)
Friction type damper + steel shaft with dedicated mounting bracketE1.0 h
MAZDA6 / AtenzaAll GJ series carsMKF4900¥104,500
(¥ 95,000)
Friction type damper + steel shaft with dedicated mounting bracketE1.0 h
CX-30All DM series carsMBP4900A¥104,500
(¥ 95,000)
Friction type damper + steel shaft with dedicated mounting bracketE1.0 h
MX-30DREJ3PMBP4900A¥104,500
(¥ 95,000)
Friction type damper + steel shaft with dedicated mounting bracketE1.0 h
CX-5All KF / KE series carsMKF4900¥104,500
(¥ 95,000)
Friction type damper + steel shaft with dedicated mounting bracketE1.0 h
CX-8All KG series carsMKF4900¥104,500
(¥ 95,000)
Friction type damper + steel shaft with dedicated mounting bracketE1.0 h