Planetary Gear & Transmission Patent Landscape 2026
The planetary gear and transmission patent space is highly concentrated, with Sumitomo Heavy Industries holding a commanding lead among the top filers. Activity peaked in 2019 and has eased since, placing the field in a decline phase—though adjacent branches in electrified drivetrains and aerospace remain structurally underserved.
Sumitomo leads a moderately concentrated field with a clear tier gap
Sumitomo Heavy Industries holds the top position by a wide margin, followed by REM Technology, Nabtesco, Pratt & Whitney Canada, and ZF Friedrichshafen—all clustered at roughly a quarter of Sumitomo’s volume. The top five filers account for 28% of the combined output of the hundred largest filers.
A steep drop-off exists between the market leader and the second tier: Sumitomo’s 136 patent records is more than three times the next-ranked applicant’s tally. Below rank five, counts compress further, indicating a long tail of smaller participants rather than a second concentrated bloc.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Sumitomo Heavy Industries, Ltd. | 136 | |
| 2 | REM Technology Inc | 39 | |
| 3 | Nabtesco Corporation | 37 | |
| 4 | PRATT & WHITNEY CANADA CORP | 37 | |
| 5 | ZF Friedrichshafen AG | 32 | |
| 6 | Dana Limited | 32 | |
| 7 | OSRO GmbH | 30 | |
| 8 | JTEKT Corporation | 29 | |
| 9 | Fallbrook Intellectual Property Co LLC | 26 | |
| 10 | Genesis Advanced Technology Inc | 24 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | SEW EURODRIVE GMBH & CO KG | 19 | |
| 12 | Enplas Corporation | 17 | |
| 13 | NSK Ltd. | 16 | |
| 14 | South China University of Technology | 16 | |
| 15 | Guangzhou Huaxinke Enterprise | 15 | |
| 16 | Robert Bosch GmbH | 14 | |
| 17 | Flender GmbH | 14 | |
| 18 | The Timken Company | 13 | |
| 19 | Sikorsky Aircraft Corporation | 13 | |
| 20 | ZF Sachs AG | 13 |
Sumitomo’s dominance in core gearing and transmission sub-classes signals deep, entrenched IP coverage in planetary and cycloidal architectures. Challengers differentiate either through process specialization (REM Technology in gear finishing) or end-application focus (Pratt & Whitney Canada in aerospace turbomachinery).
Filing counts for 2024 and especially 2025–2026 are under-counted due to typical 18–24 month publication lag and should not be interpreted as representing final activity levels for those years. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filing volume has eased from its 2019 peak; core gearing dominates but adjacent classes are growing in share
The annual filing trend reveals a field that crested in 2019 and has retrenched, while the technology composition chart shows that although F16H (gearing and transmissions) is overwhelmingly dominant, meaningful secondary clusters in cycle drive, vehicle propulsion, electric motors, and aerospace have emerged.
Annual filing trend
Filings rose from 2017 through a 2019 peak of 103 records, then fell. The recent-window decline of 42% reflects the post-peak correction; 2024–2026 bars are materially under-counted due to publication lag and should be read as floors, not final totals.
↗ Hover for values · click a bar to ask EurekaTechnology composition
F16H (gearing and transmissions) accounts for the large majority of IPC records. The next-largest clusters—B62M (cycle drive), B60K (vehicle propulsion), H02K (electric motors), B62D (vehicles and robotics locomotion), and B64C (aeroplanes and helicopters)—each represent small but distinct application domains, pointing to cross-sector reach of planetary gear technology.
↗ 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.
Outer tooth profile of planetary gear apparatus
A planetary gear apparatus comprising an inner tooth gear having an inner peripheral portion formed with a plurality of inner teeth each in the form of a semi-circular cross-section shape and an outer tooth gear positioned within the inner tooth gear and having an outer peripheral portion formed with a plurality of outer teeth each in the form of a wave… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Star gear system with lubrication circuit and lubr… | 997 |
| 2 | Continuously variable transmission | 439 |
| 3 | Continuously variable planetary gear set | 292 |
| 4 | Continuously variable transmission | 277 |
| 5 | Continuously variable transmission | 229 |
| 6 | Continuously variable transmission | 223 |
| 7 | Continuously variable transmission | 205 |
| 8 | Continuously variable planetary gear set | 199 |
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 patent structure means for R&D investment decisions
United States–dominant jurisdiction profile shapes the strategic context for any new entrant or existing player.
Decline stage: volume has eased from the 2019 peak
The lifecycle assessment classifies this field as Decline, with annual filings easing back from the 2019 peak of 103 records. On a multi-year basis the corpus is still substantial at 581 patent families, but incremental coverage of core planetary gear architectures is increasingly crowded. New entrants should target differentiated sub-domains rather than core F16H ground already densely covered by established players.
Past-peak · 2019 highSumitomo leads; second tier is tightly bunched but distant
The top five filers command 28% of the hundred largest filers’ combined output, with Sumitomo alone at 136 patent records—more than triple any single competitor. The second tier (REM Technology, Nabtesco, Pratt & Whitney Canada, ZF Friedrichshafen, Dana, OSRO) is clustered between 30 and 39 records each, indicating that challenging the leader directly requires sustained, targeted investment rather than incremental filing.
High leader concentrationREM Technology–OSRO is the dominant co-filing pair
The most active co-applicant relationship is between REM Technology and OSRO GmbH, with 28 jointly filed records—by far the largest collaboration pair in the corpus. A secondary pairing exists between Nabtesco and Tokyo Electron (5 records), and Sumitomo has minor co-filing relationships with NHK Spring (2 records) and Kawasaki Heavy Industries (1 record). Outside these pairs, the ecosystem is largely non-collaborative, suggesting most IP is developed and held unilaterally.
REM–OSRO dominant pairUnited States is the primary filing office; China and Europe follow
The United States leads with 557 jurisdiction-level records, followed by China at 409, Europe (EPO) at 257, Japan at 217, and WIPO (PCT) at 110. Canada and the United Kingdom each register 52 records. This multi-jurisdictional spread reflects the global commercialization footprint of planetary gear technology across automotive, industrial, and aerospace sectors, with notable Asia-Pacific coverage through Japan and China.
US-led, globally spreadGo 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 |
|---|---|---|
| REM Technology Inc | OSRO GmbH | 28 |
| Nabtesco Corporation | Tokyo Electron Limited | 5 |
| Sumitomo Heavy Industries, Ltd. | NHK Spring Co., Ltd. | 2 |
| Sumitomo Heavy Industries, Ltd. | Kawasaki Heavy Industries, Ltd. | 1 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Sumitomo anchors core gearing IP; Pratt & Whitney Canada is the notable new entrant in aerospace
The leader and the most momentum-active new entrant occupy very different technology niches: Sumitomo dominates planetary and cycloidal gear architectures, while Pratt & Whitney Canada has entered focused on gas-turbine star-gear and transmission systems.
Sumitomo Heavy Industries
Sumitomo holds 136 patent records, concentrated in F16H 1 (core gearing and transmissions, 135 records), F16H 55 (gear-tooth forms, 33 records), and F16H 57 (gear housings and lubrication, 15 records). This breadth across fundamental planetary gear sub-classes reflects an entrenched IP position that covers design, tooth geometry, and assembly architecture. No momentum data indicates a long-established, stable filing cadence.
136 patent recordsPratt & Whitney Canada
Pratt & Whitney Canada has 37 patent records and is identified as a new entrant in the recent filing window, with 9 recent records and an upward momentum trend. Its focus spans F16H 1 (gearing, 37 records), F02C 7 (gas-turbine plant accessories, 28 records), and F16H 57 (gear housings, 28 records), signaling a deliberate strategy to combine planetary gear architecture with aerospace turbomachinery integration—a relatively uncrowded intersection in this corpus.
37 patent records| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Pratt & Whitney Canada Corp | 9 | ▲ new entrant |
Cycle drive, vehicle propulsion, and electric motor integration are under-served relative to core gearing
Five IPC branches adjacent to the dominant F16H class each represent low single-digit percentage shares of corpus records. Two stand out for both their relative sparsity and their plausible technical connection to evolving planetary gear applications.
H02K · Electric motors & generators – planetary integration
With 87 IPC records and a 3% share, electric motor integration with planetary gear stages is observably sparse relative to the scale of the electrified drivetrain market. Planetary gear reducers are a natural fit for in-wheel and coaxial motor architectures in EVs and industrial robots. The sparse coverage here—despite broad activity in B60K vehicle propulsion (93 records)—suggests that electromechanical co-design at the motor-gearbox interface remains an under-filed intersection. Teams with motor design capability alongside gear expertise have a realistic entry path.
Search this in Eureka →B64C · Aeroplanes & helicopters – geared turbofan & rotorcraft
The B64C branch shows 62 IPC records and a 2% share, notably low given that geared turbofan engines and helicopter main rotor gearboxes are established high-value applications. The top-cited patent in the corpus—a star gear system with lubrication circuit—directly addresses this domain, and Pratt & Whitney Canada’s new-entrant momentum confirms active interest. However, patenting volume remains thin, pointing to a field where technical barriers (certification, life-cycle testing) slow filing rates and where focused IP investment could establish meaningful positions ahead of wider industry activity.
Search this in Eureka →How leading applicants differ by technology route across IPC branches
Route coverage across the main technology branches in the current evidence set.
| Player | F16H 1 · Gearing & transmissions | F16H 57 · Gearing & transmissions | F16H 37 · Gearing & transmissions | F16H 55 · Gearing & transmissions | F16H 15 · Gearing & transmissions |
|---|---|---|---|---|---|
| Fallbrook Technologies Inc | Absent | Absent | Strong · 114 | Absent | Strong · 114 |
| Sumitomo Heavy Industries, Ltd. | Strong · 135 | Emerging · 15 | Absent | Moderate · 33 | Absent |
| Pratt & Whitney Canada Corp | Strong · 37 | Strong · 28 | Absent | Absent | Absent |
| REM Technology Inc | Absent | Strong · 28 | Absent | Strong · 33 | Absent |
| Dana Limited | Absent | Absent | Strong · 27 | Absent | Strong · 32 |
| OSRO GmbH | Absent | Strong · 25 | Absent | Strong · 28 | Absent |
| Enplas Corporation | Strong · 17 | Strong · 16 | Absent | Strong · 12 | Absent |
Frequently asked questions
The corpus covers 581 patent families. Filing counts by year and jurisdiction are reported at the patent-record level, which can exceed the family total because a single family may be filed across multiple offices or carry multiple IPC codes.
Sumitomo Heavy Industries is the leading applicant with 136 patent records, more than three times the next-ranked filer. Its IP is concentrated in core F16H gearing, gear-tooth geometry, and gear-housing sub-classes.
The field is classified as Decline. Annual filings peaked at 103 records in 2019 and have eased since. The 581-family corpus represents a mature, well-covered body of IP rather than a rapidly expanding frontier. Note that 2024–2026 filing counts are under-counted due to publication lag.
The United States leads with 557 jurisdiction-level records, followed by China (409), Europe via the EPO (257), Japan (217), and WIPO PCT filings (110). Canada and the United Kingdom each register 52 records.
The dominant co-filing relationship is between REM Technology and OSRO GmbH, with 28 jointly filed records. The next most active pairing is Nabtesco and Tokyo Electron with 5 records. Most other applicants file independently.
The most technically plausible under-served branches are H02K (electric motors and generators, 87 IPC records) for electromechanical co-design in EV and robotics drivetrains, and B64C (aeroplanes and helicopters, 62 IPC records) for geared turbofan and rotorcraft gearbox architectures. Both are sparse relative to their commercial relevance and have realistic entry paths for teams with cross-domain 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.
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