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GB/T 11366-2025Basic terminology of planetary drives (English PDF)

行星传动基本术语

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Issued by

State Administration for Market Regulation; Standardization Administration of China

Level / Type

National · Recommended

Issue date

October 31, 2025

Implementation date

May 1, 2026

Scope

GB/T 11366-2025 is the English-translated version of 行星传动基本术语.

GB/T 11366-2025 is the Chinese standard "Basic terminology of planetary drives". Its scope clause reads: This document defines the basic terminology and definitions related to the general concepts, classifications, and applications of planetary transmissions.

This document applies to the definition of various planetary transmission types, including low tooth difference, harmonic, Ravina, and Simpson types. Planetary roller screw, planetary cycloid. Its clauses include general concepts.

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Document preview — GB/T 11366-2025

National Standard of the People's Republic of China

ICS: 21.200
Classification: J17

Issued by: State Administration for Market Regulation; Standardization Administration of China

Preface
1.Scope
2 Normative References
3 General Concepts
4.Classification
4.1 According to the meshing method
4.2 According to the basic component combination method
4.3 By number of transmission stages
5 Applications
5.1 Low Tooth Difference Transmission
5.2 Harmonic Gear Transmission
5.3 Ravina-type transmission and Simpson-type transmission
5.4 Planetary roller screw drive
5.5 Planetary cycloidal drive

1 Scope

This document defines the basic terminology and definitions related to the general concepts, classifications, and applications of planetary transmissions.

This document applies to the definition of various planetary transmission types, including low tooth difference, harmonic, Ravina, and Simpson types.

Planetary roller screw, planetary cycloid.

2 Normative references

This document has no normative references.

3 General Concepts

3.1 Planetary gear drive

A transmission system consisting of a central gear, planetary gears, a planetary carrier, and an output component.

Note. The center gear (including the sun gear and internal gear ring), planetary gears, planet carrier, and output components are collectively referred to as the basic components of a planetary gear transmission. See Figure 1.

Index number explanation.

1---Internal gear ring;

2---Planetary gears;

3---Sun Wheel;

4---Input axis;

5---Planet Carrier;

6---Output components.

Figure 1 Schematic diagram of planetary gear transmission structure

3.2 planetary gear

Planetary Gear […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 32 pages — is available in the English PDF.

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Editions of GB/T 11366

Edition	Title	Revision	Status
GB/T 11366-2025	Basic terminology of planetary drives	current edition	Current
GB/T 11366-1989	Basic terminology of planetary drives	previous edition	Superseded

This page sells the current edition, GB/T 11366-2025. Earlier editions are listed for reference only.

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