Rolling Bearing Mounting & Retention Patent Landscape
The rolling bearing mounting and retention space is dominated by a small group of established bearing specialists — NSK, SKF, NTN, Schaeffler, and Timken — who together account for the majority of filings, creating a highly concentrated competitive structure. The field has passed its 2018 peak and annual volumes have since eased, signaling a mature-to-declining phase where incremental differentiation and adjacent-application expansion are the primary strategic levers.
NSK and SKF lead a tightly held competitive field
NSK Ltd ranks first with 144 patent records, followed closely by AB SKF with 140 — a near-tie at the top that reflects a sustained head-to-head rivalry. NTN Corp (66), Schaeffler Technologies (65), and. The Timken Company (57) form a second tier with roughly half the output of the leaders.
The top five filers account for 42% of the combined total across the hundred largest filers, indicating meaningful but not overwhelming concentration. A material gap separates the top two from the next three, and a further drop separates the second tier from the remaining ranked applicants, creating a three-tier structure.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | NSK Ltd | 144 | |
| 2 | AB SKF | 140 | |
| 3 | NTN Corporation | 66 | |
| 4 | SCHAEFFLER TECHNOLOGIES AG & CO KG | 65 | |
| 5 | The Timken Company | 57 | |
| 6 | SKF GmbH | 30 | |
| 7 | JTEKT Corporation | 30 | |
| 8 | BorgWarner Inc | 27 | |
| 9 | SKF IND TRADING & DEV CO NV | 27 | |
| 10 | Koyo Seiko Co Ltd | 24 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Amsted Rail Co Inc | 20 | |
| 12 | MinebeaMitsumi Inc | 18 | |
| 13 | Caterpillar Inc | 17 | |
| 14 | ArvinMeritor Technology LLC | 17 | |
| 15 | Robert Bosch GmbH | 14 | |
| 16 | SKF Industrie SpA | 14 | |
| 17 | Safran Aircraft Engines SAS | 11 | |
| 18 | Hansen Transmissions International NV | 11 | |
| 19 | Siemens AG | 11 | |
| 20 | INA Walzlager Schaeffler KG | 11 |
The entrenchment of bearing OEMs at the top implies that any new entrant would be competing directly on core mounting and retention know-how against parties with decades of accumulated IP. Partnerships or licensing agreements with mid-tier holders may offer a more efficient route to freedom-to-operate.
Data for the most recent 18–24 months is likely under-counted due to publication lag; apparent low volumes in 2024–2026 should not be interpreted as a further acceleration of decline. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Activity peaked in 2018 and the technology mix is overwhelmingly F16C-anchored
The annual filing trend reveals a clear peak in 2018 followed by a gradual easing, while the technology composition shows near-total dominance of the core bearing and shaft class with a long tail of application-specific branches.
Annual filing trend
Annual filings climbed from 36 in 2017 to a peak of 62 in 2018, then declined in stages to 39 in 2023. Figures for 2024–2026 are suppressed by publication lag and should not be read as continued decline. The overall trajectory confirms the lifecycle assessment of a field that has eased from its peak.
↗ Hover for values · click a bar to ask EurekaTechnology composition
F16C (shafts, bearings and couplings) dominates the IPC mix by a wide margin, reflecting the core mechanical focus of the corpus. F16B (fasteners), F16H (gearing and transmissions), B60B (vehicle wheels), and H02K (electric motors) each represent secondary clusters, pointing to vehicle drivetrain and electrification as the main adjacent application zones.
↗ 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.
Linear ball bearing mounting flange and fabricatio…
A linear ball bearing mounting flange, which is provided on at least one end of an outer cylinder of a linear ball bearing and is used for mounting the linear ball bearing on a machine or apparatus. The flange includes a flange-shaped structure having a thick wall and provided separately from the outer cylinder. The flange-shaped structure has an annular… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Bearing arrangement for axial fan | 120 |
| 2 | Small size fan | 109 |
| 3 | Controlled position axle nut and method system to … | 108 |
| 4 | Method for setting the axial end play of tapered r… | 89 |
| 5 | Duplex rolling element bearing mounting for ensuri… | 87 |
| 6 | Prosthesis locking assembly | 80 |
| 7 | Method and apparatus for measuring clearance in do… | 76 |
| 8 | Pinion mounting with direct tapered roller bearing… | 75 |
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
The combination of a mature lifecycle, concentrated ownership, and a broad but thinly covered application tail shapes where incremental versus disruptive R&D effort is likely to yield returns.
Field is in decline phase, past its 2018 peak
The lifecycle assessment is classified as Decline, with annual filings easing back from the 2018 peak of 62. This indicates that the foundational invention space is largely staked out. R&D investment is more likely to yield returns in application-specific sub-domains or in integrating sensing and condition-monitoring functionality into retention assemblies rather than in core mounting geometry.
Lifecycle: DeclineTop five control 42% of the leading-filer pool
NSK and SKF are effectively co-leaders at the top, with NTN, Schaeffler, and Timken close behind. The top five filers collectively hold 42% of the patent records among the hundred largest filers. This degree of concentration means that broad freedom-to-operate in core mounting and retention will require either licensing from or design-around of these five parties. Mid-tier holders such as JTEKT, BorgWarner, and Amsted Rail may represent more accessible licensing or acquisition targets.
High concentrationCo-filing is limited and largely intra-group
The most active co-filing pairs are NSK Ltd with Kawasaki Steel Corporation (3 joint filings) and NTN Corp with NTN Toyo Bearing Co Ltd (3 joint filings). SKF’s group entities also co-file internally. Koyo Seiko and Kawasaki Heavy Industries collaborated on 2 filings. The ecosystem shows very little cross-group collaboration, suggesting that joint development programs outside established corporate families are rare and could represent a differentiation opportunity for ecosystem-building.
Limited cross-groupUS leads filings; Japan and China are near-equal second and third
The United States is the top filing jurisdiction, followed by Japan and China in close succession, with Europe (EPO) fourth. The UK, WIPO (PCT), and Germany follow at lower volumes. South Korea and India are present but thin. This distribution reflects the home markets of the dominant Japanese and European bearing OEMs, with China’s strong presence pointing to both growing local demand and defensive IP coverage by incumbents.
US · JP · CN · EPGo 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 |
|---|---|---|
| NSK Ltd | Kawasaki Steel Corporation | 3 |
| NTN Corporation | NTN TOYO BEARING CO LTD | 3 |
| AB SKF | SKF China Ltd | 2 |
| Koyo Seiko Co Ltd | Kawasaki Heavy Industries Ltd | 2 |
| NSK Ltd | Sugiman Tomoji | 1 |
| NSK Ltd | Japanese National Railways | 1 |
| NSK Ltd | Kawasaki Heavy Industries Ltd | 1 |
| AB SKF | SKF Aerospace France | 1 |
| AB SKF | SKF (Shanghai) Automotive Technologies Co Ltd | 1 |
| Koyo Seiko Co Ltd | Director-General of Agency of Industrial Science and Technology | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
NSK and SKF lead on core F16C35 retention; Timken and Schaeffler follow closely
The top two applicants are separated by only four patent records and share nearly identical technology emphasis, making this the most contested head-to-head in the corpus. Both recent-period momentum readings reflect very small recent filing bases, consistent with a maturing field.
NSK Ltd
NSK Ltd leads the ranking with 144 patent records, concentrated in F16C35 (bearing mounting and fixing, 107 records), F16C19 (rolling bearings, 90 records), and F16C25 (bearing adjustment and preloading, 48 records). Their applicant momentum shows a new-entrant pattern in recent filings, consistent with very low late-period volumes across the whole field. NSK’s depth across all three core F16C sub-classes positions it as the broadest portfolio holder in pure mounting and retention mechanics.
patent records: 144AB SKF
AB SKF ranks second with 140 patent records and shows a nearly identical F16C sub-class distribution: F16C35 (111 records), F16C33 (bearing components, 53 records), and F16C19 (49 records). SKF’s slightly stronger presence in F16C33 suggests a broader focus on bearing component design alongside pure retention. Like NSK, SKF’s recent-period momentum reflects the new-entrant pattern characteristic of the publication-lag window. SKF’s group entities — SKF GmbH (30), SKF Ind Trading & Dev Co NV (27), and SKF Ind SPA (14) — extend its effective coverage further.
patent records: 140| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| NSK Ltd | 2 | ▲ new entrant |
| AB SKF | 4 | ▲ new entrant |
| The Timken Company | 1 | ▲ new entrant |
| Schaeffler Technologies AG & Co KG | 1 | ▲ new entrant |
Under-served adjacent branches worth monitoring
The whitespace analysis identifies IPC classes adjacent to the dominant F16C core where filing density is comparatively low relative to the evident technical overlap, suggesting these branches may be under-served within the rolling bearing mounting and retention framing.
H02K · Electric motors & generators
With 104 patent records, H02K represents a sparse but technically plausible adjacent branch. Rolling bearing mounting and retention is critical to motor rotor alignment, axial preload management, and vibration control in EV drivetrains and industrial motors. The shift toward electrification increases the stakes of bearing retention design in high-speed, thermally variable motor environments. The entry path for bearing specialists involves co-developing mounting sub-assemblies with motor OEMs or filing in the intersection of retention geometry and electromagnetic performance — an area where few dedicated filings appear in this corpus.
Search this in Eureka →F03D · Wind motors (wind turbines)
F03D accounts for only 29 patent records in this corpus, despite wind turbine main shafts and gearboxes being among the most demanding environments for large-format bearing retention. Tapered and spherical roller bearing mounting under high axial and radial loads, combined with slow-speed high-torque conditions, creates specific retention challenges that differ from automotive or industrial applications. The relative sparsity here may reflect that wind turbine bearing filings are split across F16C, F16H, and F03D in ways that dilute visibility. An entrant with wind-specific retention solutions — particularly for direct-drive configurations — faces limited direct prior art in this combined framing.
Search this in Eureka →How leaders differ by technology route across F16C sub-classes
Route coverage across the main technology branches in the current evidence set.
| Player | F16C 35 · Shafts, bearings & couplings | F16C 19 · Shafts, bearings & couplings | F16C 33 · Shafts, bearings & couplings | F16C 25 · Shafts, bearings & couplings | F16C 23 · Shafts, bearings & couplings |
|---|---|---|---|---|---|
| NSK Ltd | Strong · 107 | Strong · 90 | Moderate · 44 | Moderate · 48 | Emerging · 5 |
| AB SKF | Strong · 111 | Moderate · 49 | Moderate · 53 | Moderate · 25 | Emerging · 14 |
| NTN Corporation | Strong · 29 | Strong · 40 | Strong · 43 | Strong · 40 | Absent |
| The Timken Company | Strong · 43 | Strong · 39 | Strong · 27 | Strong · 23 | Absent |
| Schaeffler Technologies AG & Co KG | Strong · 36 | Strong · 33 | Strong · 22 | Strong · 19 | Absent |
| BorgWarner Inc | Strong · 32 | Strong · 22 | Strong · 22 | Absent | Strong · 28 |
| Koyo Seiko Co Ltd | Strong · 27 | Strong · 19 | Moderate · 12 | Absent | Absent |
Frequently asked questions
The corpus contains 394 patent families in scope for rolling bearing mounting and retention.
NSK Ltd leads with 144 patent records, fractionally ahead of AB SKF at 140 patent records. The two are effectively co-leaders at the top of the ranking.
The field is classified as Decline. Annual filings peaked in 2018 at 62 and have eased since. The most recent years show low volumes, partly explained by publication lag, but the overall multi-year trajectory is downward from the 2018 peak.
The United States leads all jurisdictions, followed by Japan and China in close succession. Europe via the EPO is the fourth-largest jurisdiction, with the UK, WIPO (PCT), and Germany also receiving material filing volumes.
Collaboration is limited and predominantly intra-group. The most active co-filing pairs are NSK Ltd with Kawasaki Steel Corporation and NTN Corp with NTN Toyo Bearing Co Ltd, each with 3 joint filings. Cross-group collaboration between unrelated bearing OEMs is rare in this corpus.
H02K (electric motors and generators) and F03D (wind turbines) are the most notable adjacent branches with comparatively low filing density relative to their technical relevance. F16B (fasteners), F16H (gearing and transmissions), and B60B (vehicle wheels and tyres) are also adjacent branches with modest filing counts in this corpus.
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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.
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