Sector Gear: Load Capacity Up to 5000 N, Face Width 10 to 50 mm

Component Specifications

Definition

A sector gear is a specialized gear component consisting of only a segment of a full gear wheel, designed to mesh with a pinion or other gears within limited angular motion. In recirculating ball nut assemblies, it functions as part of the motion conversion mechanism, typically engaging with a worm gear or lead screw to translate rotational input into controlled linear output with high precision and minimal backlash. This component is critical in applications requiring accurate positioning and smooth motion transfer.

Working Principle

The sector gear operates on the fundamental principle of gear meshing, where its teeth engage with a mating gear (usually a pinion or worm) to transfer torque and motion. In recirculating ball nut systems, it converts the rotary motion of the input shaft into linear displacement of the nut along the screw axis. The partial arc design allows for controlled angular movement within specific limits, making it ideal for applications with restricted rotation ranges. The recirculating balls reduce friction and wear, enhancing efficiency and precision.

Materials

Typically manufactured from alloy steels (e.g., AISI 4140, 4340) or stainless steels (e.g., 304, 316) for strength and corrosion resistance. Heat treatment processes such as carburizing, nitriding, or induction hardening are applied to achieve surface hardness of 58-62 HRC, while maintaining a tough core. Alternative materials include bronze or engineered polymers for specific applications requiring reduced weight or noise.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Module	1.5 to 6 mm
Backlash	0.05 to 0.15 mm
Face Width	10 to 50 mm
Load Capacity	Up to 5000 N
Pitch Diameter	30 to 300 mm
Pressure Angle	20 degrees
Surface Finish	Ra 0.8 to 1.6 μm
Number Of Teeth	15 to 60

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, ISO 6336, DIN 3990

Parent Products

This component is used in the following industrial products

Sector Gear / Recirculating Ball Nut

A steering gearbox component that converts rotational steering input into linear motion to turn the vehicle's wheels.

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Engineering Analysis

Risks & Mitigation

Tooth wear and pitting
Backlash increase leading to positioning errors
Fatigue failure under cyclic loads
Corrosion in harsh environments
Misalignment causing uneven load distribution

FMEA Triads

Trigger: Inadequate lubrication
Failure: Accelerated tooth wear and overheating
Mitigation: Implement regular lubrication schedules using high-temperature grease; install automatic lubrication systems.

Trigger: Excessive load or shock loads
Failure: Tooth bending or breakage
Mitigation: Design with safety factors; use overload protection devices; conduct regular load monitoring.

Trigger: Misalignment during installation
Failure: Uneven wear and increased vibration
Mitigation: Use precision alignment tools during assembly; perform periodic alignment checks; train personnel on proper installation procedures.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Gear tooth profile tolerance per ISO 1328-1 Grade 6-8; backlash tolerance within 0.05-0.15 mm as per application requirements

Test Method

Coordinate measuring machine (CMM) for dimensional accuracy; hardness testing per ISO 6508; load testing under simulated operational conditions; backlash measurement using dial indicators or laser alignment systems

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Sector Gear

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

WUXI CHIAN TECHNOLOGY CO.,LTD

Wuxi, Jiangsu, CN

Also makes: Injection Molding Machine

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “sector gear”
View source page ↗ chiantech.com · recorded 2026-10-11

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Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the primary function of a sector gear in a recirculating ball nut system?

The sector gear converts rotary motion from an input shaft into precise linear motion of the ball nut, enabling accurate positioning in machinery such as CNC machines and robotics.

How does material selection impact sector gear performance?

Material choice affects durability, load capacity, and corrosion resistance. Alloy steels offer high strength for heavy loads, while stainless steels provide corrosion resistance, and polymers reduce weight and noise.

What are common failure modes for sector gears?

Common failures include tooth wear, pitting, fatigue cracking, and backlash increase, often due to improper lubrication, overloading, or misalignment.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Sector Gear