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Sector Gear Component – Machinery and Equipment Manufacturing

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

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

Standards

ISO 1328-1, DIN 3960, ISO 6336, DIN 3990

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Sector Gear.

Parent Products

This component is used in the following industrial products

Sector Gear / Recirculating Ball Nut

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

View Product Details

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

Interchangeable Parts

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

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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