Qualify the model, not the architecture label
Compare the same load cycle against each candidate’s repeated and momentary limits. A gait category alone cannot approve or exclude a gearbox family.
Harmonic Drive: gear-unit rating tableSupplier evaluation tool + sourcing report
China Humanoid Robot Ankle Joint Manufacturer Guide
Use this China humanoid robot ankle joint manufacturer guide to compare product scope and load evidence. Build a supplier validation brief before sending an RFQ.
By Magatom Dynamics Co., Ltd., publisher of Custom Humanoid Actuator (CHA). Public-source research and a reproducible checklist; no supplier endurance tests or customer outcomes are claimed.
Ankle supplier evaluation tool
Choose three inputs to generate a validation plan and copyable RFQ brief. No defaults are selected.
Your supplier validation plan
The result identifies comparison priorities, missing evidence and next steps. It does not calculate torque or approve a supplier.
1 · Select inputs
2 · Review gaps
3 · Copy brief
Four decisions before shortlisting a manufacturer
These are our sourcing recommendations based on the linked product documentation and engineering guidance. They are not supplier approvals.
Keep thermal and shock checks separate
Ask for current, temperature and torque-speed records under your cooling conditions. A short peak rating cannot establish continuous walking capacity.
maxon: On the heating of motorsConfirm exactly what the supplier delivers
A reducer, a motor module and a pitch/roll ankle assembly carry different integration work. Match the quotation to a documented bill of materials.
Laifual: reducers and joint modulesPublic product availability is only a starting point
Use the listed Chinese manufacturers to investigate components. Require written evidence for ankle interfaces, load-cycle life and replacement support.
Unitree: GO-M8010-6 motorWhat the tool does, and what remains unknown
This is an editorial checklist, not a physics simulation or live supplier filter. Walking dynamics selects one of three validation priorities; the mass class adds a load-data request; the foot design adds a compliance or load-sharing request. The same inputs always produce the same brief. No manufacturer is ranked or approved.
| Input | Effect on the brief | Boundary |
|---|---|---|
| Mass: < 40 / 40–70 / > 70 kg | Adds a request for exact operating mass and payload. | All bands require load data; the upper band has no capacity ceiling. |
| Static / dynamic / jumping | Prioritizes holding duty / torque-speed and control / landing validation. | Changes the investigation priority, not an approved gearbox type. |
| Rigid / passive / active foot | Requests contact loads / compliance data / toe load sharing and fault cases. | No assumed torque reduction or impact-protection credit. |
Define the load case
Geometry + force + motion
Compare model limits
Torque + speed + temperature
Validate the assembly
Installed test + agreed criteria
Build separate pitch and roll load cases
For a single external force, its moment contribution is r × F; the component about an ankle axis depends on geometry and force direction. A full model must also include other forces, inertia and linkage transmission. Robot mass is not a substitute for that model.
| Input group | Required information | Why it matters |
|---|---|---|
| Geometry and contact | Per-axis lever arms, contact-force directions and center-of-pressure range | Mass alone cannot produce ankle torque. |
| Motion and load sharing | Pitch/roll angle, speed, acceleration and force-time histories | Double support, single support and toe actuation change load distribution. |
| Duration and environment | Hold time, gait duty cycle, ambient temperature and cooling interface | Needed for motor, driver and gearbox continuous-duty review. |
| Assembly limits | Bearing forces/moments, hard stops, housing and cable routing | A suitable gear rating does not qualify the installed ankle. |
Engineering interpretation: use this input list to prepare a model-specific review. Compare the resulting cycle with the supplier’s limits. Harmonic Drive: gear-unit rating table
Compare architectures without a universal winner
These are investigation paths. Exact model ratings, transmission ratio and assembly tests decide suitability. QDD and series elasticity are distinct design choices.
| Candidate | Reason to investigate | Evidence needed |
|---|---|---|
| Strain-wave geared module | Investigate where ratio, package and positioning targets fit. | Measure lost motion and stiffness; compare model-specific repeated/impact ratings. No blanket running or jumping exclusion. |
| Cycloidal / RV geared module | Investigate candidates with a suitable load rating and bearing package. | Check mass, inertia, efficiency and dimensions. Do not transfer an overload multiplier across models. |
| Low-ratio / QDD drive | Investigate when backdrivability and torque-control response are priorities. | Check motor current, holding duty, gearbox limits and cooling in the installed assembly. |
| Series-elastic mechanism | Investigate an intentional spring element with measurable deflection. | Check spring travel, fatigue and control behavior. QDD does not by itself mean series elasticity. |
Chinese manufacturers: verified product scope
A non-exhaustive starting list, not a ranking. Official catalogs establish the product families below. They do not establish a complete ankle’s fitness for your robot. Prices, lead times, MOQ and ankle-specific life data remain unverified as of September 21, 2026.
Prepare a supplier RFQ packageLeaderdrive
Strain-wave gears; rotary actuators listed separately
Publicly documented: Public strain-wave product families provide a starting point for a geared-module inquiry.
Request before shortlisting: Exact model, reduction ratio, installed bearing limits and repeated-impact qualification.
Leaderdrive: strain-wave product rangeLaifual Drive
Harmonic reducers and integrated joint modules
Publicly documented: Catalog distinguishes reducer products from modules integrating motor and encoder.
Request before shortlisting: DC bus, driver inclusion, output interface and thermal records for the proposed assembly.
Laifual: reducers and joint modulesNantong Zhenkang
RV reducer component families
Publicly documented: Official product range includes ZKRV-E and ZKRV-C.
Request before shortlisting: Model mass and envelope, transmission efficiency, bearing arrangement and ankle integration responsibility.
Nantong Zhenkang: RV product rangeUnitree Robotics
GO-M8010-6 joint motor component example
Publicly documented: Product information includes control interface and feedback parameters.
Request before shortlisting: Output-side ratings, firmware access, continuous-duty limits and intended mounting arrangement.
Unitree: GO-M8010-6 motorEvidence register and limits
Primary manufacturer documentation, checked on the dates shown. Product listings are vendor evidence, not independent ankle endurance tests. We review this guide every six months and when cited product documentation changes; next scheduled review: March 21, 2027. No public evidence here supports a universal shock multiplier, torque-by-mass range or overheating time.
| Primary source | What it supports | Limitation / date |
|---|---|---|
| Harmonic Drive: gear-unit rating table | Separates rated, repeated-peak and momentary-peak torque, with model-specific backdriving and stiffness data. | Reducer ratings are not a complete ankle or motor thermal qualification. Undated catalog; checked September 21, 2026 |
| maxon: On the heating of motors | Explains current-related heating, speed losses and the effect of the motor controller. | General motor guidance in a hand-tool context; it supplies no humanoid walking-time limit. Updated August 29, 2024; checked September 21, 2026 |
| Leaderdrive: strain-wave product range | Lists strain-wave gears and links to rotary actuator products. | Does not establish suitability for a particular ankle load cycle. Undated catalog; checked September 21, 2026 |
| Laifual: reducers and joint modules | Lists harmonic reducers and integrated reducer, motor and encoder modules. | Driver inclusion, ankle interfaces and application ratings need a model-specific quotation. Undated catalog; checked September 21, 2026 |
| Nantong Zhenkang: RV product range | Lists ZKRV-E and ZKRV-C reducer families. | A reducer listing does not verify a complete humanoid ankle assembly or landing endurance. Undated catalog; checked September 21, 2026 |
| Unitree: GO-M8010-6 motor | Publishes a joint motor with reduction ratio, voltage, communication and feedback specifications. | This component listing does not prove interchangeability with H1/G1 ankle modules. Undated product page; checked September 21, 2026 |
Risks, cost and alternatives
| Risk | Decision impact | Minimum mitigation |
|---|---|---|
| Misuse: selecting by mass alone | An unqualified module can exceed torque or bearing limits. | Obtain per-axis load histories and agree an acceptance test before release. |
| Cost: incomplete quotations | A low reducer price can omit bearings, driver, encoder, fixture and NRE. | Compare the same delivered assembly and list one-time versus recurring costs. |
| Scenario mismatch: catalog to jumping | A catalog operating point does not represent landing events. | Use the required event count and impact duration; evaluate alternative ratios or compliance with evidence. |
| Supply continuity: custom interfaces | Firmware, seals or output hardware may be hard to replace. | Agree drawing revisions, service parts, documentation and change notification. |
If a candidate fails a criterion, compare a different ratio, package, cooling arrangement or mechanism under the same load case. A change of gearbox family alone is not evidence that the problem is solved.
Three worked sourcing scenarios
Illustrative input-to-action examples, not customer results or measured performance.
Light research robot / slow gait / rigid foot
Process: The tool prioritizes holding duty and positioning. Collect the hold duration, contact geometry and fall-load case.
Decision: Compare integrated geared modules only after checking heat and lost motion. No torque figure follows from the light mass band.
40–70 kg robot / running / passive foot
Process: The tool prioritizes torque-speed and control validation. Include spring travel, damping and bottom-out loads with gait traces.
Decision: Compare candidates against the same trace; a compliant foot is not evidence of impact survival.
> 70 kg robot / jumping / active toe
Process: The tool prioritizes landing validation. Collect exact loaded mass, toe timing and the locked-toe fault case.
Decision: Investigate low-ratio and elastic options alongside any geared candidate with relevant tests. Qualification remains pending.
Turn the brief into a comparable RFQ
Attach the tool brief and the items below. If an input is unknown, mark it “to be confirmed” and request a review of assumptions before a model recommendation. This checklist is also usable without the interactive tool.
| Scope | Buyer supplies | Manufacturer returns |
|---|---|---|
| Mechanics | Pitch/roll CAD and revision, installation envelope, mass budget, bearing forces and moments | Dimensioned drawing plus interface ownership |
| Operating cycle | Torque-speed trace, hold duration, landing/fall cases and required life | Separate continuous, repeated-peak and momentary limits with test conditions |
| Electrical and thermal | Bus voltage, protocol, encoder, controller and cooling boundary | Driver limits, temperature records and derating curves |
| Commercial scope | Prototype/pilot quantity, forecast, destination and schedule | Itemized module BOM, NRE, MOQ, lead time and replacement support |
| Acceptance | Agreed load cycle, error limits, thermal ceiling and inspection plan | Traceable sample results and approved drawing revision |
Request an ankle integration review
Share your brief, CAD revision and unresolved load cases with Custom Humanoid Actuator. This is an inquiry to our team; we do not represent the manufacturers listed above.
Start an ankle joint inquiryAnkle joint manufacturer FAQ
Using the tool
Does this tool calculate ankle torque?
No. It generates a rule-based supplier evaluation brief from three categorical inputs. Torque requires geometry, per-axis force and motion histories, and duty-cycle limits.
Which group includes exactly 40 kg or 70 kg?
Both use the 40–70 kg group. Enter the class for total operating mass including payload, then include the exact value in the RFQ. The > 70 kg category has no upper bound.
What if the gait or foot design is undecided?
Use the manual RFQ checklist and label the unknowns. Request an engineering review of CAD and load assumptions before requesting a rated part.
Engineering evidence
Are harmonic drives unsuitable for all dynamic ankles?
A gait label cannot establish that. Review the specific reducer’s repeated and momentary torque limits, bearing loads, stiffness and installed test results.
Does a cycloidal reducer always withstand five times rated torque?
Do not use a universal multiplier. Require the selected model’s overload limit, duration, event count and applicable operating conditions.
Are QDD and series-elastic actuators the same?
No. Quasi-direct drive generally describes a low-ratio transmission approach. A series-elastic mechanism deliberately includes an elastic element. Either still needs application validation.
Can the foot design reduce the evidence required?
No. Passive compliance needs stiffness, damping and bottom-out data; active toes need timing and load-sharing data, including fault cases. Neither establishes an ankle rating by itself.
How should pitch and roll be specified?
Supply separate torque-speed and bearing-load cases, plus coupled poses. If a parallel linkage couples the axes, include its geometry and actuator-to-joint load mapping.
Does a peak torque rating establish continuous performance?
No. Review motor and driver heating, gearbox limits and installed cooling under the actual cycle. There is no universal number of walking minutes before overheating.
Procurement
Are these verified complete ankle manufacturers?
The sources establish relevant product families, not a qualified complete ankle for your robot. Confirm who owns assembly, integration testing and the quoted bill of materials.
Does sourcing from China guarantee lower cost or faster delivery?
No. Obtain comparable written quotations covering the same assembly, engineering work, test scope, shipping and support. Current prices and lead times are not verified here.
When should I choose a complete module over components?
Compare integration effort against interface and thermal requirements. A module can reduce assembly tasks; a component route gives more design control but needs explicit ownership of bearings, housing, electronics and testing.
Ready to review your ankle joint requirements?
Send your evaluation brief, pitch/roll drawings and unresolved load cases to our team for an integration review.
Request an ankle joint review