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August 10, 2020 07:45 AM

Toyota uses plastic to lighten the load in the 2021 Sienna

Sarah Kominek
Sarah Kominek
Staff Reporter
Plastics News Staff
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    Toyota Motor Corp.
    Toyota’s new injection molded two-occupant seat back frame in the 2021 Sienna minivan, which goes on sale later this year, won the 2020 Altair Engineering Enlighten Award in the module category.

    In redesigning its Sienna Minivan, Toyota Motor Corp. wanted a lighter material to help its customers who wanted an easier way to adjust seats. It also happened to create an industry first, which won a lightweighting award.

    The automaker's new injection molded two-occupant seat back frame in the 2021 Sienna minivan, which goes on sale later this year, won the 2020 Altair Engineering Enlighten Award in the module category.

    The project, led by Todd Muck, senior principal engineer for body design at Toyota, with help from its supplier partner BASF, reduced the normally 15-piece steel folding third-row seat back to one component, according to an Aug. 5 news release by Toyota. It also cut production costs by 15 percent and reduced weight by 30 percent.

    "Reducing the seatback's mass provides the customer with several benefits," Muck said. "Less weight can improve fuel economy. Or, we can use that saved weight in other areas, such as adding new features like the built-in refrigerator."

    The most apparent benefit, Muck said, is the reduced effort it takes for customers to raise the folded third-row seat from its stored area in the floor to its upright position.

    "The weight of the seat really impacts … customer experience," Muck said at the Center for Automotive Research's Management Briefing Seminars Aug. 5. "This was a win-win, not only lightweighting the vehicle but actually affecting the customer's efforts directly.

    "Our new design has made lifting the seats much easier," he said. "With the previous design, it would take more than 24 kilograms [53 pounds] of force to raise the seat. The new design requires less than 9-kilograms [19 pounds] of force."

    Toyota selected plastics out of a competitive list of materials to develop the part, Muck said.

    "Magnesium is a very good product for its applications but the post-processing, the tooling span … those types of things really impacted the cost," he said. "The injection molding was a little more … easy to incorporate many more parts, including the nut inserts for instance."

    "This will change the seating at Toyota for a while," Muck added.

    Attendorn, Germany-based lightweight component supplier Mubea won an Enlighten Award for Enabling Technology for its glass-fiber-reinforced leaf spring, Plastic News' sister publication Automotive News reported. The component is used mostly in the suspension systems of heavy trucks. The spring weighs up to 75 percent less than a typical multileaf steel spring.

    DuPont Co.'s Betaseal X2500 adhesive, which joins thermoplastic inner and outer panels, was runner-up.

    A Future of Lightweighting award went to Marelli for its sheet compression-molded suspension steering knuckle, which reduces weight by 25 percent over the aluminum version and by 50 percent over steel knuckles.

    Nissan took runner-up honors for an aluminum and carbon-fiber body panel design that can reduce weight by about 50 percent over steel panels.

    Altair, a suburban Detroit software engineering firm specializing in product development, has granted the awards for the past seven years.

    "I am proud to see that the Altair Enlighten Awards have become a sought-after recognition that acknowledges the world's greatest automotive lightweighting innovations while inspiring interest from industries, engineers, policymakers, educators, students and the public," Altair CEO James Scapa said in a statement.

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