E-Axle Noise and Vibration Patents: Trends & Leaders 2026
- Accelerating from a standing start. Filings sat at zero through 2022 before climbing to a peak of 4 in 2024, marking an early-stage technology still building its claim base.
- Gearing, not motors, carries the claim density. F16H gearing subclasses appear in 10 of 12 records, while suspension integration (B60G) appears in just one — a sharp imbalance for anyone deciding where to file next.
- One filing family anchors the newest scope. American Axle & Manufacturing's 2026 filing extends two earlier related publications, concentrating the most defensible recent claims in a single lineage.
The Shape of the E-Axle NVH Patent Landscape
E-axle noise and vibration patents sit at the intersection of drivetrain mechanics and acoustic engineering, covering gear whine reduction, vibration damping structures and acoustic optimization inside the compact housing of an electric drive axle. This dataset of 12 patent families, drawn from a scoped search across B60K, F16H and B60L15 classifications, shows a technology area that only began generating meaningful filing volume in the last few years of the coverage window.
Claim density is heavily skewed toward gearing and drivetrain integration, while suspension-linked vibration control remains almost untouched. Receiving-office data shows filings concentrated in the United States, with single filings scattered across China, Europe, India, Mexico and the WIPO PCT route — a pattern consistent with an early-stage, not-yet-globalized technology.
How E-Axle NVH Filings Have Grown
Across a tightly scoped search of 12 patent families, filing activity shows a technology still in its early build-out phase, with the bulk of claim density concentrated in drivetrain and gearing subclasses.
Filing Activity, 2017-2026
Filings were flat at zero through 2022, then accelerated to a peak of 4 in 2024. The 2025-2026 figures are undercounts because publication typically lags filing by around 18 months, so recent-year totals will rise as records catch up.
Technology Composition by IPC Subclass
B60K (vehicle propulsion and drive) and F16H (gearing and transmissions) dominate the corpus, appearing in 12 and 10 of the 12 records respectively. B60T (braking), H02K (motors) and B60G (suspension) trail well behind, with B60G represented in only a single record.
Shares are the percentage of the 12 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on E-Axle Noise and Vibration with Eureka
This page is one run against one query. Ask Eureka your own question about e-axle noise and vibration and every answer comes back with the patent numbers behind it.
Try EurekaKey Patents in E-Axle NVH
Multi-speed electric drive axle using multi-layshaft transmission
An electric drive axle with an electric motor having a motor shaft that is rotatable about an axis, a differential, and a transmission. The transmission transmits rotary power between the motor shaft and the differential. The multi-speed reduction has an input shaft and at least three on-axis gears, each co-axial with the input shaft and rotatable relative to it in a first or second speed ratio, with the input shaft axially movable to couple different gears.Filed by American Axle & Manufacturing, Inc.; published 2026-05-07. Part of a family lineage that includes at least two related prior publications.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | CN109849636A | 一种多轴重型车辆用独立悬架电驱动桥 | 7 |
| 2 | US12077041B2 | Multi-speed electric drive axle using multi-layshaft transmission | 2 |
| 3 | US20240181858A1 | Multi-speed electric drive axle using multi-layshaft transmission | 1 |
Citation counts here reflect influence within this searched corpus and skew toward older filings; they are not a ranking of current commercial importance.
Patent titles are shown in the language they were filed in, not translated, so that each record stays verifiable against the original filing — a translated title will not match in Eureka or in any national register. Publication numbers are shown where the record carries one (3 of 3 rows); clicking a row searches Eureka by that number.
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Browse MCP servers →What the Filing Pattern Tells You
With only 12 families in scope, this is a thin but revealing dataset: it shows where claim pressure is building and where it has not yet arrived.
Growth started late and is still accelerating
The midpoint year of 2022 recorded zero filings, meaning all activity in this corpus is concentrated in the back half of the coverage window. That timing, combined with the 18-month publication lag, suggests the true filing rate today is higher than the visible data shows.
Gear-stage claims dominate the scope
Nearly every record in this dataset intersects with gearing and transmission IPC codes, meaning claim space around gear geometry and mesh design is already densely occupied. That density is a filing signal, not evidence the underlying whine problem is solved.
One older filing anchors influence in the set
CN109849636A, covering an independent-suspension electric drive axle for heavy vehicles, is cited far more than any other record in this corpus. Because citation counts favor older filings by nature of search-corpus timing, this signals historical influence rather than current commercial relevance.
Recent momentum is cooling, not building
The assignee with the most recent-year activity shows a sharp year-over-year drop, and the two other tracked assignees show none at all in the latest year. That pattern looks more like a completed filing push than an actively expanding campaign.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to e-axle noise and vibration, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| Beijing Institute of Astronautical Launch Technology | China Academy of Launch Vehicle Technology (CALT) | 1 |
Co-assignee activity is minimal in this dataset — a single pair of Chinese research entities appears together once, with no other cross-filing partnerships recorded.
Who Is Filing, and Where the Gaps Are
With just 12 families in scope and no single assignee holding more than a handful, this is a landscape defined more by open space than by entrenched leaders.
American Axle & Manufacturing, Inc. (American Axle & Manufacturing)
Holds the newest and most detailed filing in the dataset, extending a multi-speed, multi-layshaft transmission design across at least three related publications. Its latest-year filing count dropped sharply year-over-year, consistent with a completed filing push rather than sustained expansion.
Beijing Institute of Astronautical Launch Technology + China Academy of Launch Vehicle Technology (CALT)
These two Chinese research institutes appear together on a single co-assigned filing, the only recorded co-filing partnership in this dataset. Neither shows filing activity in the latest year.
Independent-suspension heavy-vehicle e-axle filer
The single most-cited record in the dataset covers an independent-suspension electric drive axle for heavy vehicles, filed in China. Its citation count reflects age-driven influence within this corpus rather than current market weight.
| Assignee | Recent year | YoY |
|---|---|---|
| American Axle & Manufacturing, Inc. | 1 | -75% |
| Beijing Institute of Astronautical Launch Technology | 0 | — |
| China Academy of Launch Vehicle Technology (CALT) | 0 | — |
Where to Take This Analysis
A 12-family landscape is a starting map, not a final answer. These are the follow-on checks worth running before committing engineering or legal resources.
Run a freedom-to-operate check on multi-speed gear selection
Before designing a new multi-speed e-axle reduction stage, verify whether the mechanism relies on axial shaft movement across co-axial on-axis gears — the specific scope reinforced across American Axle & Manufacturing's filing lineage.
Check claim scope in EurekaWatch the 2025-2026 filing catch-up
Because publication lags filing by roughly 18 months, the current picture of 2025-2026 activity is an undercount. Re-run this landscape in six to twelve months to see whether the 2024 peak was a one-off or the start of a sustained climb.
Set a landscape refresh in EurekaExplore the suspension-integration white space
B60G suspension coupling appears in only one of 12 records despite its mechanical link to vibration transmission. A deeper prior-art search focused specifically on suspension-to-housing damping structures would clarify how open this space really is.
Search adjacent classes in EurekaFrequently Asked Questions
An e-axle (electric drive axle) integrates an electric motor, gear reduction, and differential into a single unit that drives the wheels, replacing the separate engine-transmission-axle layout of a combustion vehicle. Because the motor and gearing sit much closer to the cabin and run at higher rotational speeds than a combustion drivetrain, gear whine and motor-induced vibration become more audible to occupants rather than being masked by engine noise. NVH performance is therefore a differentiating engineering target for e-axle suppliers, and it shows up in patent claims covering gear geometry, damping structures, and motor-shaft isolation.
This dataset of 12 patent families is small and concentrated, with American Axle & Manufacturing holding the most recent and most technically detailed filing (US20260124891A1) alongside two related prior publications. Chinese entities including Beijing Institute of Astronautical Launch Technology and China Academy of Launch Vehicle Technology (CALT) also appear as co-assignees on at least one filing. With filing volumes this low across all parties, no single company has established dominant scale yet, and the field remains open to new entrants who file well-drafted claims.
Suspension integration (IPC class B60G) is the clearest gap, appearing in only one of the 12 records despite its direct mechanical link to vibration transmission. Motor and generator design (H02K, 4 records) and braking-related NVH (B60T, 5 records) are also thinner than the dominant gearing and drivetrain classes. These gaps suggest that combining motor-shaft damping with specific gear-mesh frequencies, or treating suspension mounts as active vibration-damping structures, remain open design spaces rather than settled claim territory.
Filing activity was essentially zero through 2022 and only began accelerating afterward, peaking at 4 filings in 2024, which points to an early-stage but accelerating landscape rather than a mature one. High density in the F16H gearing subclass — present in 10 of 12 records — means gear-stage claim space is already occupied, but that reflects filing activity, not that the underlying vibration problem is solved. Because publication lags filing by roughly 18 months, the true 2025-2026 filing count is understated in current data.
The patent claims a multi-speed electric drive axle where an axially-movable input shaft, coupled to the motor shaft, selects among at least three co-axial on-axis gears to change speed ratio. This is a specific mechanical arrangement, not a claim over multi-speed e-axles generally, and it is reinforced by at least two related prior publications from the same assignee (US12077041B2 and US20240181858A1). Engineers designing competing multi-speed reduction stages should check whether their gear-selection mechanism relies on this same axial-shift-across-on-axis-gears approach before assuming freedom to operate.
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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.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.