Flexible Cup Wall: Torque Capacity 5-5000 Nm

Q: What is the primary function of the flexible cup wall?

The flexible cup wall converts elliptical deformation into rotational motion through controlled flexing, enabling high-ratio speed reduction and torque multiplication in harmonic drive systems.

Q: How does wall thickness affect performance?

Thinner walls increase flexibility and reduction ratio but reduce torque capacity, while thicker walls enhance durability and torque transmission at the expense of flexibility and reduction range.

Q: What maintenance is required for flexible cup walls?

Regular lubrication with specified grease, periodic inspection for fatigue cracks, and monitoring of backlash increase. No routine adjustment is needed due to preloaded design.

Component Specifications

Definition

The flexible cup wall is a critical component of the flexspline in harmonic drive mechanisms, consisting of a thin-walled cylindrical structure with gear teeth on its outer periphery. It undergoes controlled elastic deformation when engaged with the wave generator, creating elliptical deflection that enables high-ratio speed reduction and torque multiplication through meshing with the circular spline.

Working Principle

Operates on strain wave gearing principle where the flexible cup wall deforms elliptically under pressure from the wave generator, causing its external teeth to engage progressively with the internal teeth of the circular spline, resulting in precise rotational motion transmission with high reduction ratios.

Materials

High-strength alloy steel (typically 40CrNiMoA or similar), heat-treated to HRC 50-55, with surface hardening for wear resistance. Alternative materials include maraging steel or titanium alloys for specialized applications.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Backlash	<1 arc-minute
Tooth Module	0.2-1.0 mm
Wall Thickness	0.5-2.0 mm
Torque Capacity	5-5000 Nm
Positioning Accuracy	<1 arc-minute
Operating Temperature	-40°C to +120°C
Reduction Ratio Range	50:1 to 320:1

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 1328-1, DIN 3960, JIS B 1702

Parent Products

This component is used in the following industrial products

Flexspline

A thin-walled, flexible cup-shaped component in a harmonic drive that deforms elastically to transmit torque through wave generator engagement.

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Engineering Analysis

Risks & Mitigation

Fatigue failure from cyclic stress
Tooth wear from improper lubrication
Overload deformation beyond elastic limit
Thermal expansion mismatch
Corrosion in harsh environments

FMEA Triads

Trigger: Excessive cyclic loading beyond design limits
Failure: Fatigue crack propagation leading to wall rupture
Mitigation: Implement torque limiters, regular non-destructive testing, and proper load calculation during design

Trigger: Inadequate or contaminated lubrication
Failure: Accelerated tooth wear and increased backlash
Mitigation: Use specified lubricants, establish maintenance schedules, and install contamination seals

Trigger: Misalignment during assembly
Failure: Uneven tooth contact and premature failure
Mitigation: Use precision alignment tools, implement assembly procedures, and conduct run-in tests

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Tooth profile tolerance: IT4-IT5, Wall thickness variation: ±0.02 mm, Concentricity: 0.01 mm TIR

Test Method

Coordinate measuring machine (CMM) verification, Finite element analysis (FEA) for stress distribution, Dynamic fatigue testing per ISO 6336, Backlash measurement with precision encoders

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Flexible Cup Wall

Manufacturer profiles associated with Flexible Cup Wall.

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Frequently Asked Questions

What is the primary function of the flexible cup wall?