Latest Breakthrough in Ceramic Bearing Research - Grease Lubrication from JTEKT

On June 10th, JTEKT quietly updated its official website with a press release. The title was highly technical—"Development of Grease-Lubricated Ceramic Ball Bearings for e-Axle Bearings for High-Performance EVs"—and no Chinese media translated it as news. However, within the Japanese precision bearing industry, this press release caused a minor upheaval. This was because JTEKT announced product specifications of 30,000 rpm—grease lubrication, ceramic balls, and non-contact seals. Currently, no other bearing manufacturer globally offers e-Axle bearings with all three of these features in its mass-production catalog. Even less noticed was that just nine days earlier, on June 1st, JTEKT had released another press release: a 40,000 rpm ultra-high-speed deep groove ball bearing. Two "world firsts" within a month. No CEO interview, no "AI strategy white paper," no Hannover-level press conference. JTEKT simply posted the press release on its website. In June, the Japanese bearing industry dominated headlines with three major events. First, the merger of NSK and NTN was undergoing antitrust scrutiny—the EU Phase 1 filing was expected to be submitted in Q3. The two companies together held approximately 15% of the global bearing market share, and the merged entity would directly challenge SKF's leading position. Second, Schaeffler was revealed by an analyst named Serenity to have at least 45 humanoid robot customers—far exceeding the previously disclosed three. Third, on July 2nd, SKF announced a joint venture with Green Harmonic Drive in China, holding a 60% stake, targeting precision transmission components for humanoid robot joints. Each of these events made headlines. Each was dramatic—merger, revelation, and controlling stake. Meanwhile, JTEKT's two press releases, published in the same month, went virtually unnoticed. But if you're looking at "which bearing company has the strongest technological reserves in the EV field over the next decade," JTEKT's two announcements in June are likely more valuable than any headline. This isn't the cliché of an "overlooked hidden champion." JTEKT is not a hidden champion—it's the world's sixth-largest bearing manufacturer, a core member of the Toyota Group, with annual revenue exceeding 1.4 trillion yen (approximately 70 billion RMB), second only to SKF, Schaeffler, NSK, NTN, and Timken. It hasn't been overlooked—it simply chose to remain silent. 30,000 RPM + Grease Lubrication + Ceramic Balls: Why are these three terms combined? To understand how counterintuitive JTEKT's product, released on June 10th, is, we need to understand a fundamental engineering principle: the higher the speed, the more difficult the lubrication. The input shaft bearings of traditional automotive engines operate at approximately 6,000-8,000 rpm. High-performance EVs' e-Axle motors have already exceeded 20,000 rpm—the Tesla Model 3's motor peaks at 18,000 rpm, and the Lucid Air reaches 20,500 rpm. The higher the speed, the greater the centrifugal force inside the bearing, causing the grease to degrade rapidly at high temperatures, and the stress on the cage increases exponentially. Therefore, the industry standard answer is: high speeds require oil lubrication. Oil can circulate for cooling, can be continuously replenished, and can form a stable oil film when bearings rotate at high speeds. However, oil lubrication has a fatal limitation: it requires an oil supply system—an oil pump, oil lines, a cooler, and seals. In some e-Axle configurations, due to space and weight constraints, the oil lines simply cannot fit. JTEKT engineers focused on this "inaccessible oil line" gap. They asked three questions: Can grease lubrication replace oil lubrication? Can 30,000 revolutions be achieved under grease lubrication conditions? Can ceramic balls be used on the rolling elements simultaneously to prevent electrolytic corrosion? Three questions, three "no's"—at least in the product catalogs of JTEKT's competitors, these three conditions have never appeared simultaneously. JTEKT's answer was posted on their website on June 10th: Ceramic ball rolling elements—lightweight, high-rigidity, and non-conductive, preventing electrolytic pitting under the potential difference of an 800V high-voltage platform. Synthetic long-life grease—reformed for improved oil retention, water resistance, and corrosion resistance at high temperatures, suitable for continuous high-speed operation. The high-rigidity resin cage—remains undeformed and unbreakable under centrifugal force at 30,000 rpm. The non-contact seal—does not increase frictional torque while firmly sealing the grease inside the bearing. These four components combine to form the e-Axle bearing, which can reach 30,000 rpm without oil and will not be damaged by electrolytic corrosion. Market research data corroborates the value of this direction: the global EV bearing market is projected to grow from $2.9 billion in 2025 to $5.9 billion in 2030, a CAGR of approximately 15%. Among these, ceramic hybrid bearings are the fastest-growing and highest-priced sub-category—because they solve not just the problem of "better," but the problem of "indispensability." The 800V high-voltage platform is penetrating from mid-to-high-end models to the mass market, and electrolytic corrosion is no longer a "potential hidden danger," but a "definite design constraint." Ceramic balls have gone from "optional" to "standard." Toyota's "shadow bearing factory": PRJTEKT's presence in the capital market is far less significant than its technological strength, as it doesn't need financing. A key reason is its shareholding structure: Toyota Motor holds approximately 22% of JTEKT's shares, and Toyota Industries holds approximately 12%, totaling over one-third. JTEKT doesn't need to tell its story to the capital markets—Toyota is its anchor shareholder and its largest customer. Toyota's hybrid and pure electric vehicles—from the Prius to the bZ4X—have already secured JTEKT's bearing specifications during the development phase. This means that every new product from JTEKT already has a confirmed internal customer before its release. It doesn't need to go to Hanover to win the Hermes Award to prove its technological direction is correct, like Schaeffler—Toyota's purchase orders are its "Hermes Award." But this structure also brings a side effect that has been overlooked by the market: JTEKT hardly does any PR. Its competitors—SKF releases press releases on AI sovereign supercomputing, Schaeffler releases a comparison table of 45 robotics customers, NSK releases a joint statement with Delta Electronics on signing an MOU—each is using media narratives to shape its image as a "technology company." JTEKT doesn't. Its press release style is: "Developed XX product. Parameters are as follows: XX. Applicable scenarios: XX. This product was exhibited at XX exhibition." Then, a product cross-section diagram is attached. This low-key style of the "Toyota system" is a disadvantage in the early stages of the EV supply chain—the capital market doesn't see it, and industry analysts prioritize citing companies that hold press conferences when writing reports. However, after the EV supply chain enters the "mass production and delivery" stage, this style will suddenly become an advantage—because customers don't care if you hold a press conference; they only care if you can deliver parts that meet specifications on time. And JTEKT's delivery system, which has been refined with Toyota for a century, no longer needs to use PowerPoint presentations to prove its delivery capabilities. Who is the winner of the EV bearing war? It's not the loudest one. Looking at the layout of the six global bearing giants in the EV field, a clear tactical map emerges. SKF is pursuing a "platformization" route—its automotive business has become an independent Vertevo brand, listed on Nasdaq Stockholm in Q4, aiming to raise the profit margin of the automotive segment from -0.8% to 6-9%. Schaeffler is pursuing a "robotics-first" strategy—focusing on humanoid robot joint actuators, with EV bearings serving as a cash cow. NSK and NTN are pursuing a "merger for survival" strategy—the two combined hold a 15% global market share, but they must first pass EU antitrust hurdles, and their wheel bearing business may be forcibly divested. Timken is pursuing a "precision transmission" strategy—extending from tapered roller bearings to harmonic components and toroidal reducers. JTEKT is taking a completely different fifth path. It doesn't compete with SKF on whose name is more Latin—it competes on having more "30,000 RPM grease-lubricated ceramic ball bearings" in its product catalog. It doesn't compete with Schaeffler on who has more robot customers—it competes on who can gain a first-mover advantage on Toyota, Honda, Nissan, and BYD's next-generation e-Axle platform. It doesn't compete with NSK-NTN on who has a larger global market share—it competes on who can fill the product matrix in the fastest-growing and highest-priced segment of "EV bearings." JTEKT now offers the 40,000 rpm ultra-high-speed DGBB, the 30,000 rpm grease-lubricated ceramic bearing, the ultra-compact JUCD differential, and the Ultra Compact Bearing designed specifically for lightweight BEVs—these four products together cover every rotational node of the e-Axle, from the input shaft to the differential. This approach has a name: standard setter. When global EV manufacturers are designing their next-generation e-Axles, if JTEKT's catalog has all the bearings you need—and each category has a "world's highest rev" option—purchasing managers don't need to be convinced. The catalog itself is the most powerful persuasion. In June, the headlines in Japanese bearing news were about mergers, revelations, and controlling stakes. JTEKT's name didn't appear in any of those headlines. But looking back 10 years from now—when global EV production grows from approximately 40 million units per year in 2026 to over 100 million units in 2035—who will determine the biggest winner in the EV bearing market won't be who made the loudest press conference that year. Who had the most complete product catalog back then? JTEKT's two press releases in June, which no one translated, are perhaps the best illustration of this conclusion.