Planet Gear Pins/Shafts: Diameter Tolerance h6 or better

Component Specifications

Definition

Planet gear pins/shafts are critical rotating components in planetary gear carriers that serve as mounting points for planet gears. They provide precise radial positioning, rotational support, and torque transfer between the sun gear and ring gear. These shafts must maintain exact alignment under high cyclic loading while minimizing friction and wear in the gear mesh interface.

Working Principle

These shafts rotate within the planet carrier assembly, transmitting torque from the sun gear through the planet gears to the ring gear. They function as both load-bearing axles and torque-transmitting elements, with their precise geometry ensuring proper gear meshing and load distribution across multiple planet gears for balanced power transmission.

Materials

Typically manufactured from case-hardened alloy steels (e.g., AISI 8620, 4140, or 4340) with surface hardness of 58-62 HRC and core toughness of 30-40 HRC. High-performance applications may use carburized steels, nitrided alloys, or specialized bearing steels with corrosion-resistant coatings.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Straightness	0.01 mm per 100 mm
Concentricity	0.005 mm TIR
Load Capacity	Dynamic: 15-50 kN, Static: 30-100 kN
Hardness Depth	0.8-1.2 mm case depth
Surface Finish	Ra 0.4 μm or better
Diameter Tolerance	h6 or better

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 6336, ISO 1328, DIN 3961, DIN 3962, AGMA 2001

Parent Products

This component is used in the following industrial products

Planet Carrier

A structural component in planetary gear systems that holds and supports the planet gears, allowing them to rotate around the sun gear while maintaining proper alignment and spacing.

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Engineering Analysis

Risks & Mitigation

Fatigue failure from cyclic loading
Bending deformation under overload
Surface wear from inadequate lubrication
Fretting corrosion at mounting points
Misalignment causing uneven load distribution

FMEA Triads

Trigger: Insufficient surface hardness or improper heat treatment
Failure: Premature surface pitting and spalling
Mitigation: Implement strict material certification and hardness testing protocols

Trigger: Improper installation or misalignment
Failure: Uneven load distribution leading to premature failure
Mitigation: Use precision alignment tools and torque-controlled installation procedures

Trigger: Inadequate lubrication or contamination
Failure: Accelerated wear and scoring of bearing surfaces
Mitigation: Implement regular lubrication maintenance and contamination control measures

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 1101, dimensional tolerances per ISO 286

Test Method

Hardness testing per ISO 6508, surface roughness per ISO 4287, dimensional inspection per ISO 14253, fatigue testing per ISO 6336

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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CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Planet Gear Pins/Shafts

Manufacturer profiles associated with Planet Gear Pins/Shafts.

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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 planet gear pins/shafts?

They provide rotational support and precise positioning for planet gears while transmitting torque between the sun gear and ring gear in planetary gear systems.

How do material specifications affect performance?

Case-hardened alloy steels provide surface hardness for wear resistance while maintaining a tough core for impact resistance, ensuring durability under high cyclic loading conditions.

What are common failure modes for these components?

Common failures include surface pitting from fatigue, bending from overload, wear from inadequate lubrication, and fretting corrosion at mounting interfaces.

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.

Planet Gear Pins/Shafts