Sensor-Bearing / Hub Unit Integration Patent Landscape
Sensor-bearing and hub unit integration is a mature, highly concentrated field dominated by Japanese and European bearing specialists, with NSK holding a commanding lead over all rivals. Annual filing volumes peaked in 2017 and have since eased, placing the field in a declining phase that presents selective openings in adjacent sensing and measurement branches.
NSK leads a tightly concentrated field of bearing incumbents
NSK Ltd ranks first by a wide margin, accumulating 2,006 patent records — nearly seven times the count of second-ranked AB SKF (308 patent records). JTEKT Corp (274), NTN Corp (194), and Schaeffler Technologies (187) round out the top five.
The top five filers account for 83% of the combined total across the hundred largest filers, signaling an exceptionally high concentration. The gap between NSK and the second tier is structural, not cyclical, and reflects decades of cumulative investment by the leading applicant.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | NSK Ltd. | 2,006 | |
| 2 | AB SKF | 308 | |
| 3 | JTEKT Corporation | 274 | |
| 4 | NTN Corporation | 194 | |
| 5 | SCHAEFFLER TECHNOLOGIES AG & CO KG | 187 | |
| 6 | Koyo Seiko Co., Ltd. | 50 | |
| 7 | SKF GmbH | 38 | |
| 8 | MinebeaMitsumi Inc. | 28 | |
| 9 | SKF ENG & RES CENT | 25 | |
| 10 | FAG KUGELFISCHER GEORG SCHAFER & CO | 24 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | SKF IND TRADING & DEV CO NV | 23 | |
| 12 | LEMKEN GMBH & CO KG | 18 | |
| 13 | SKF Industrie S.p.A. | 17 | |
| 14 | Agora Law Group PLLC | 17 | |
| 15 | INA Wälzlager Schaeffler KG | 15 | |
| 16 | SKF Aerospace France SAS | 14 | |
| 17 | Mercedes-Benz Group AG | 13 | |
| 18 | LOHR & BROMKAMP GMBH | 12 | |
| 19 | BorgWarner Inc. | 12 | |
| 20 | Rexnord Corporation | 12 |
Such concentration means new entrants or adjacent-industry players face a dense prior-art landscape in core F16C bearing classes. Differentiation opportunities are more likely to emerge in sensing sub-classes (G01P, G01L, G01D) where the incumbent portfolio density is comparatively lower.
Filing counts for 2025–2026 reflect publication lag and are likely under-counted; conclusions about recent activity should be treated as provisional. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Peak activity passed in 2017; sensing sub-classes remain structurally thinner
The filing trend chart and technology composition chart together show where momentum has been and where structural gaps persist across IPC branches.
Annual filing trend
Filings reached a peak of 70 records in 2017 and have trended downward since, with notable year-to-year variation. The 2025 and 2026 bars are subject to publication lag and should not be read as confirmation of continued decline. The field is best characterized as post-peak on an annual basis.
↗ Hover for values · click a bar to ask EurekaTechnology composition
F16C (Shafts, bearings and couplings) dominates the composition by a large margin. B60B (Vehicle wheels and tyres) and G01P (Velocity and acceleration measurement) form the next tier. Sensing and measurement branches — G01P, G01L, G01D — are present but carry substantially lower counts relative to the core mechanical bearing class, indicating comparatively thinner coverage in integrated sensing functionality.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Method for assembling a double row angular contact…
A method for assembling a double row angular contact rolling element bearing unit having an inner element with two raceways, and two separate outer ring pieces each with a single raceway, said outer ring pieces enclosing a gap which is wedge-shaped in a section through the bearing unit axis, and two series of rolling elements which are each accommodated… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Wireless sensor, rolling bearing with sensor, mana… | 273 |
| 2 | Rolling bearing unit for wheel supporting | 212 |
| 3 | Rolling bearing unit for supporting wheel | 196 |
| 4 | Wireless sensor, rolling bearing with sensor, mana… | 172 |
| 5 | Rolling bearing unit | 162 |
| 6 | Rolling bearing unit with load measuring unit | 159 |
| 7 | Piezoelectric film transducer sytem for bearings | 159 |
| 8 | Bearing arrangement for axial fan | 120 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the structure means for R&D investment decisions
Four structural observations — maturity, concentration, collaboration patterns, and geography — define the investment context for engineers and IP strategists entering or expanding in this space.
Decline-phase field with selective openings
The lifecycle stage is Decline: annual filing volumes have eased back from the 2017 peak and the recent-window growth rate is negative at –25%. Core mechanical bearing sub-classes are densely occupied. Selective openings exist in adjacent sensing branches where prior-art density is lower, but the overall trajectory favors harvesting existing positions over broad new filings in the dominant class.
Decline phaseOne dominant incumbent, thin second tier
The top five filers hold 83% of the hundred largest filers’ combined total, with NSK alone accounting for the plurality at 2,006 patent records. AB SKF, JTEKT, NTN, and Schaeffler are credible second-tier players but remain far behind NSK in portfolio depth. A challenger seeking to contest the leader would need to identify sub-classes or application segments where NSK’s coverage is thinner.
High concentrationCo-filing is limited to close supply-chain pairs
The most active co-filing pair is SKF (SKF Corp) and SKF Aerospace France, with 14 joint filings — reflecting an intra-group collaboration rather than an external partnership. NSK and NSK China R&D Co. co-filed on 4 records, and NSK also co-filed with Honda Motor (2 records), Shindengen Electric (2), and Kyodo Yushi (2). JTEKT and Uchiyama Manufacturing co-filed on 3 records. Ecosystem collaboration is narrow and largely confined to parent-subsidiary or tier-1 supplier pairs.
Narrow ecosystemJapan-centric with US and EPO as secondary venues
Japan leads all jurisdictions with 1,646 patent records, reflecting the home-market concentration of the dominant applicants. The United States (770 records), Europe via EPO (553 records), and China (306 records) are the principal secondary venues. South Korea (70 records) and WIPO PCT filings (150 records) indicate selective international prosecution. China’s relatively lower count may represent a filing gap worth monitoring as domestic bearing manufacturers grow.
Japan-centricGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| AB SKF | SKF Aerospace France SAS | 14 |
| Koyo Seiko Co., Ltd. | Mitsui Seiki Kogyo Co., Ltd. | 6 |
| NSK Ltd. | NSK China Research & Development Co., Ltd. | 4 |
| JTEKT Corporation | Uchiyama Manufacturing Corp. | 3 |
| NSK Ltd. | Honda Motor Co., Ltd. | 2 |
| NSK Ltd. | Shindengen Electric Manufacturing Co., Ltd. | 2 |
| NSK Ltd. | Kyodo Yushi Co., Ltd. | 2 |
| NSK Ltd. | NSK Precision Co., Ltd. | 2 |
| NSK Ltd. | NSK MICRO PRECISION CO LTD | 2 |
| NTN Corporation | Morita Seisakusho Co., Ltd. | 2 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
NSK commands the field; SKF and Schaeffler hold credible secondary positions
Both leaders concentrate overwhelmingly on F16C sub-classes, confirming that differentiation is built on bearing design depth rather than sensing or measurement diversification. Momentum trends show broadly declining recent filing activity across the top players.
NSK Ltd
NSK leads with 2,006 patent records, concentrated in F16C19 (1,671 records), F16C33 (1,226 records), and F16C41 (848 records) — all within the core shafts, bearings and couplings class. Recent momentum shows a sharp contraction of -69% versus the prior three-year period, consistent with the field’s post-peak lifecycle. NSK’s position is entrenched but its recent filing pace has slowed materially.
patent records: 2,006AB SKF
AB SKF ranks second with 308 patent records, focused on F16C33 (218 records) and F16C19 (171 records), with a smaller presence in F16C35 (48 records). Recent filing momentum is -22% versus the prior period — a smaller contraction than NSK’s. SKF’s intra-group co-filing with SKF Aerospace France (14 joint filings) indicates deliberate extension into aerospace-adjacent bearing applications.
patent records: 308| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| NSK Ltd. | 22 | ▼ -69% |
| AB SKF | 25 | ▼ -22% |
| NTN Corporation | 4 | ▲ new entrant |
| Schaeffler Technologies AG & Co. KG | 17 | ▼ -6% |
Sensing and measurement sub-classes are under-served relative to the mechanical core
Compared with the dominant F16C core, the following branches carry significantly lower patent record counts, suggesting they are adjacent areas where the prior-art landscape is thinner and targeted investment may encounter less direct competition.
G01L · Force & pressure measurement in bearing integration
G01L carries 317 patent records — roughly 4% of the share captured by the leading IPC branch — despite load sensing being a technically central function in smart hub units for vehicle dynamics and condition monitoring. The most-cited patents in the corpus include ‘Rolling bearing unit with load measuring unit’ (159 citations), confirming technical relevance. An entrant with sensor miniaturization or MEMS-based force transducer expertise could build a differentiated position here without immediately confronting the full depth of incumbent F16C portfolios.
Search this in Eureka →G01D · General measurement and recording integrated with bearings
G01D holds 268 patent records at approximately 3% relative share, covering multi-variable measurement and data recording architectures that are increasingly relevant as hub units are expected to feed real-time data to vehicle control systems and predictive maintenance platforms. The branch sits adjacent to both G01P (velocity) and G08C (transmission of measured values, 17 records), suggesting an ecosystem of signal-chain innovations that remains sparsely claimed. Players with expertise in data acquisition hardware or embedded signal processing may find this branch accessible.
Search this in Eureka →Frequently asked questions
The analysis covers 460 patent families in the sensor-bearing and hub unit integration space, drawn from a global corpus spanning multiple jurisdictions including Japan, the United States, Europe, and China.
NSK Ltd is the leading filer with 2,006 patent records — approximately seven times the count of second-ranked AB SKF at 308 patent records. NSK’s portfolio is concentrated in F16C bearing sub-classes covering rolling-element bearing design and sealing.
The field is in a Decline stage. Annual filing volumes peaked in 2017 and have eased since, with the recent-window growth rate at -25%. Core mechanical bearing classes are densely occupied, and the pace of new filings has slowed materially across the top applicants.
Japan leads with 1,646 patent records, followed by the United States (770 records), Europe via EPO (553 records), and China (306 records). WIPO PCT filings total 150 records. The Japan-heavy distribution reflects the home-market base of the dominant applicants, NSK, JTEKT, and NTN.
The most-cited title in the corpus is ‘Wireless sensor, rolling bearing with sensor, management apparatus and monitoring system’ with 273 citations, followed by ‘Rolling bearing unit for wheel supporting’ (212 citations) and ‘Rolling bearing unit for supporting wheel’ (196 citations). ‘Rolling bearing unit with load measuring unit’ and ‘Piezoelectric film transducer system for bearings’ each carry 159 citations.
G01L (Force and pressure measurement, 317 patent records) and G01D (General measurement and recording, 268 patent records) are the most technically relevant adjacent branches with comparatively thinner prior-art coverage relative to the dominant F16C class. Both are directly relevant to smart hub unit functionality — load sensing and multi-variable data acquisition — and may offer entry points for players with sensor or signal-processing expertise.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.