INDUSTRY COMPONENT

Sector Gear

A sector gear is a partial gear segment used in recirculating ball nut systems to convert rotary motion into precise linear motion in industrial machinery.

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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.

sector gear recirculating ball nut linear motion gear component industrial machinery precision gear power transmission mechanical engineering Sector Gear in Machinery and Equipment Manufacturing

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.

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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

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

Buyer Feedback

★★★★☆ 4.9 / 5.0 (20 reviews)

"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Sector Gear meets all ISO standards."

"Standard OEM quality for Machinery and Equipment Manufacturing applications. The Sector Gear arrived with full certification."

"Great transparency on the Sector Gear components. Essential for our Machinery and Equipment Manufacturing supply chain."

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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.

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