EV Electric vehicle new car approaching the forefront of tires with tires YOKOHAMA will approach the future ... Yokohama Rubber Tire Product Development Division

Toyota has sold 3.5 million units sold in 2030 EVs (electric vehicles) and FCVs (fuel cell vehicles), Honda has a global EV and FCV sales ratio in 2040, and Nissan in the next 5 years.The movement to EV shift has accelerated in Japan, including announcing investment in about 2 trillion yen.

In Europe, a policy package called "Fit for 55", which reduces the greenhouse gas reduction target in 2030 at least by 55 % compared to 1990, was proposed, according to this, in 2035, cars other than EVs and FCVs.Sales are actually prohibited.Although the colors vary depending on the energy situation in the country and region, it seems unlikely that EV will become the center of passenger cars.

What is the current status of tires with new EV cars?

It is said that the number of parts of the car was about 30,000 points for engine cars, but the EV was reduced to about 20,000 points, and the supply chain was also significant, but what happened to the tires that support the feet of the car.Huh?Even if it becomes an EV, it is still the same as wearing four tires, and it looks black and round, but is there any change in the contents of the EV?Here, Mr. Shinji Kiyomiya of Yokohama Rubber (executive officer technology (executive officer technology), which has been positive to BMW IX3 as a tire for installing a new car (OE), as a tire for installing a new car (OE).We spoke with Assistant Assistant and Tire Product Development Division).

ADVAN Sport V107

A full -fledged EV shift has just begun, but the model will explode in the future.The Europeans are active, and the fast -paced premium brands are because they tend to be expensive, because they are easy to absorb the difference from engine vehicles if they are highly added products.In other words, it is a natural flow that the EV shift progresses so that it drips from a high price range to a low place, and the EV lineup is faster and expensive as the premium brand.It will be fulfilling.Is the need for tires with new EV cars other than BMW IX3 increasing?

Mr. Kiyomiya: "Thanks to you, we have a lot of needs. We can't say specific models yet, but we are developing new tires with new cars for premium brand flagship EVs, and we are increasing other requests."。

横浜ゴム株式会社 執行役員 技術統括補佐 兼 タイヤ製品開発本部 本部長 清宮眞二氏

What are the requirements required for EV tires?The motor has the characteristic that the maximum torque can be generated from the moment of turning around, and it is quiet without the engine sound, so road noise and pattern noise are more noticeable.In addition, the cruising range is a challenge in the current battery technology.If you want to grow, it is quick to make the battery large, but the vehicle weight will increase.There must be a situation where you want to improve your electricity.

Mr. Kiyomiya, "The EV with a large torque and heavy vehicle weight is required for tires for tires that support it, but it is to put in special technologies for EVs.It is not. If you carefully evolve the accumulated technology, it is possible to respond. "

YOKOHAMA's aggressive attitude toward EV tires

パイクスピークEVクラスに参戦（写真は2014年）

Yokohama Rubber's motorsports are so deep that there is no need to look back.At present, in addition to the one -makeup supply to Japan's highest peak of super formula, the challenge of categories with so -called tire wars such as Super GT and All Japan Rally Championships has been well known.

In addition, for Formula EV X-01 (produced by Japan EV Club in 2002), ERK of electric racing cart (produced by Japan EV Club in 2006), Pike Spike International Hill Climb, designed as EV Racing Car.Original EV Buggy's EV Racing Buggy Er-01 (participated in 2009 by Team Geolandar Ev Offroad Challenge in 2009), an original EV concept car AERO-Y (manufactured in 2013) made by adopting Yokohama Rubber's own technology.There is also a history of supporting the feet of EV concept cars and racing cars.Because of these efforts, the strength and exercise performance required for tires with new EV cars can be responded by evolving by extending the accumulated technologies and knowledge.

モータージャーナリスト 石井昌道氏

So what about quietness?In other companies, there are examples of giving new sub brands to tires that are particular about quietness, which would have been conscious of EVs.

Mr. Kiyomiya "We are currently developing tires for wearing new cars of the ADVAN and Bluearth brands. Of course, the Tires equipped with EV cars require a high level of quietness. However, this is also accumulated.Is applied. We will understand the frequency of pattern noise, and we will analyze and develop how to distribute it. Also, depending on the vehicle, install the silent form called the silent form inside the tire.So, the performance required by the accumulation of fine improvements, such as controlling the frequency of sound generated from the tires together with the pattern and structure, is realized. "

優れた低燃費性能と運動性能を両立した「BluEarth-A（ブルーアース・エース）」を装着

The ADVAN DB V552 has achieved a track record of unprecedented quietness.It is said that pattern noise is said to be 90 % determined by tread design, but the accumulation of its response technology is sufficient.In addition, in BMW IX3, as a response to the United Nations Four Wheel Running Running Regulations, the acceleration passage sound is reduced by designed dedicated to the tire professional file shape and pattern aspects so that the ground pressure becomes uniform.。

There are a handful of manufacturers that can provide new car tires for EVs

So, what are the most important performance with tires equipped with EV cars?

Mr. Kiyomiya: "What is essential for EV is the reduction of rolling resistance from the viewpoint of securing the cruising range and improving the electricity performance. Tire rolling resistance is caused by fever, so to make it smaller.The compound is mainly the key. BMW IX3 has also developed a dedicated compound. This is also an extension of the technology that has been working on fuel -efficient tires.

Of course, just because the rolling resistance is reduced should not lose the grip.Development is difficult because the European Premium brand requires a high -dimensional balance.In addition to compounds, the effect of tire lighter is large, and the profile and internal structure have been improved, reducing the resistance.However, there is no such tool.As is well known, silica composition technology is a core that reduces rolling resistance, but it is also a detailed improvement accumulation, including the development of lightweight technology. "

横浜ゴム株式会社 執行役員 技術統括補佐 兼 タイヤ製品開発本部 本部長 清宮眞二氏

A long time ago, Japanese eco-car tires were found to be secondary grip if the rolling resistance could be reduced, but the Yokohama rubber eco-tires were once DNA GP (Grand Prix), and recently Down fuel efficiency such as Bluearth-GT.It continues to be designed to balance high athletic performance.In Europe, where the speed is high, grips are inaudible performance, and if it became a premium brand, the trend was even more high.When it comes to EVs, it is important to reduce the rolling resistance, but it is necessary to increase the level of grip power.Tires that are well -balanced in total, including the high level of quietness and the performance that support the weight class, are necessary in the premium brand EV.

Mr. Kiyomiya "Originally, the total balance of new cars -equipped tires is important. In the premium brand EV, the dimension is very high. That's why we have the development of development, but motor sports.I have experienced EV -racing cars, highly quiet tires and studless tires, and I feel that I can use it in some ways to use the specialized technology.I hope that the development of Tires equipped with new EVs will increase the technology. "

モータージャーナリスト 石井昌道氏

There is no flying tool, and the technology so far will be finely improved and accumulated.When I heard that the premium brand EV -equipped tires were being developed like that, I thought it was surprisingly plain, but not any tire manufacturer can do it.Currently, there are about 100 tire manufacturers in the world, but only one hand is one with advanced technologies that can respond.Probably about 6 companies, at most 10 companies.Yokohama rubber, which takes advantage of the accumulation of past technology, is definitely there.

When it comes to the EV world, the focus is on your feet

Yokohama Rubber has two approaches, such as "deepening" and "search", as a response to changes in the era, such as "Case", "MaaS", and "DX (digital transformation)".One of the expressions is the maximizing high value -added product ratio, and the installation of new cars of "ADVAN" and "Geolandar" is expanding.Above all, the installation of the premium brand EV car is impossible without a certain technology, and it is a strategic core.

In a few years, many premium cars will become EVs, but if you look at them, there will be more cases where the "ADVAN" logo will increase.

横浜ゴム製作のオリジナルEV：AERO-Y（エアロワイ）YOKOHAMAの取り組みを詳しく知りたい方はこちら

Masamichi Ishii ｜ Motor Journalist A Motor Journalist and Motor Journalist.He has been involved in editing magazines mainly for domestic cars and imported cars, and has a wide range of knowledge, and is still writing regardless of genre.In addition, there are plenty of participation in motorsports such as one -make races.I learned the fun of cars along with driving techniques.Recently, he has been active to study eco -driving, as well as media work, and spread it widely to general drivers.