2023-06-30 21:14:03
Toyota’s top-end minivans, the new Alphard and Vellfire, have become not only people movers for families, but also chauffeur driven to move VIPs. Close-up on the components and dig deeper. This time, we will focus on the renewed platform, chassis, and body.
Uses the latest TNGA
The exterior looks like an evolutionary model, but the platform that forms the basis of the body has been renewed. It uses Toyota’s latest modular platform, “TNGA,” which is optimized for minivans and uses “GA-K,” which was developed for large front-wheel drive (FF). I think this change is largely due to the fact that the timing of the platform switch and generation change was this time. However, there is no doubt that this new platform is a great help for the new model, which was developed under the theme of sublimating performance to global standards.
Approximately 50% more body rigidity compared to conventional models
The body adopts a ring-shaped frame structure to increase body rigidity, and the rigidity is further enhanced by using a straight rocker and a V-shaped brace at the rear of the bottom of the body. This brace was developed by repeating simulations incorporating 3D scan data of uneven road surfaces that generate unpleasant vibrations and actual vehicle tests. In addition to suppressing the distortion of the underbody that causes vibration, the body rigidity has been increased by about 50% compared to the previous model.
In addition, structural adhesives are used to bond body parts, but two types with different characteristics are used. By using a high-rigidity type with stronger binding force near the areas where deformation such as twisting is likely to occur, and a high-damping type that can be expected to have a vibration suppression effect near the feet of the passengers in the cabin, both steering stability and ride comfort are achieved. are improving.
Uses a frequency sensitive damper
The front suspension uses the MacPherson strut type for TNGA, and the rear uses the double wishbone type that evolved from the conventional type. The high-end Executive Lounge and Vellfire Z Premier use frequency-sensitive dampers that mechanically change the damping force according to the frequency of vibrations transmitted from the ground. enhances sexuality.
The Vellfire is equipped with a dedicated front performance brace that connects the radiator support and side members. The front area was reinforced in pursuit of good responsiveness that allows the vehicle to move steadily from the start. In addition, the steering, springs, and dampers are specially tuned, and 19-inch tires are standard equipment.
In detail, special part control was introduced into the manufacturing process to minimize component variability. This is because it has the same overall width as before, but is equipped with large-diameter tires of up to 19 inches.
Text by Koichiro Seki
(ENGINE WEB original)
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