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GB/T 34884-2017Rolling bearings—Flexible bearings for harmonic drive gear reducers of industrial robots (English PDF)

滚动轴承工业机器人谐波齿轮减速器用柔性轴承

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

November 1, 2017

Implementation date

May 1, 2018

Scope

GB/T 34884-2017 is the English-translated version of 滚动轴承工业机器人谐波齿轮减速器用柔性轴承.

GB/T 34884-2017 is the Chinese standard "Rolling Bearings - Flexible Bearings for Harmonic Drive Gear Reducers of Industrial Robots".

Its scope clause reads: This Standard specifies the identification code, overall dimensions, technical requirements, inspection and test methods, inspection rules, marking and packaging of flexible bearings for harmonic drive gear reducers of industrial robots (hereinafter referred to as bearings).

This Standard is applicable to the production, inspection and acceptance inspection of bearings. Its clauses include terms and definitions; symbols; identification code; overall dimensions; technical requirements; inspection and test methods; inspection rules; marking; rust proof packaging.

It was issued by the General Administration of Quality Supervision, Inspection and Quarantine on NOVEMBER 1, 2017 and took effect on MAY 1, 2018.

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Document preview — GB/T 34884-2017

National Standard of the People's Republic of China

ICS: 21.100.20
Classification: J 11

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope4
2 Normative References4
3 Terms and Definitions5
4 Symbols5
5 Identification Code6
6 Overall Dimensions7
7 Technical Requirements9
8 Inspection and Test Methods13
9 Inspection Rules14
10 Marking15
11 Rust Proof Packaging15
Appendix A (normative) Overall Dimensions of Some Inch Series Bearings16

1 Scope

This Standard specifies the identification code, overall dimensions, technical requirements, inspection and test methods, inspection rules, marking and packaging of flexible bearings for harmonic drive gear reducers of industrial robots (hereinafter referred to as bearings).

This Standard is applicable to the production, inspection and acceptance inspection of bearings.

2 Normative References

The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.

GB/T 272 Rolling Bearings - Identification Code

GB/T 307.1 Rolling Bearings - Radial Bearings - Geometrical Product Specifications (GPS) and Tolerance Values

GB/T 307.2 Rolling Bearings - Measuring and Gauging Principles and Methods

GB/T 307.3 Rolling Bearings - General Technical Regulations

GB/T 308.1 Rolling Bearings - Balls - Part 1: Steel Balls

GB/T 4199 Rolling Bearings - Tolerances - Definitions

GB/T 4604.1 Rolling Bearings - Internal Clearance - Part 1: Radial Internal Clearance for Radial Bearings

GB/T 6930 Rolling Bearings - Vocabulary

GB/T 7811 Rolling Bearings - Symbols for Physical Quantities

GB/T 8597 Rolling Bearings - Rust Proof Packaging

GB/T 18254 High-carbon Chromium Bearing Steel

GB/T 24605 Rolling Bearings - Marking for Products

GB/T 24608 Inspection Rules for Rolling Bearings and Commercial Parts

GB/T 25769 Rolling Bearings - Measuring Methods for Radial Internal Clearance

GB/T 28268 Rolling Bearings - Specifications of Pressed Cages

GB/T 30819 Harmonic Drive Gear Reducers for Robots

GB/T 32562 Rolling Bearings - Measuring Methods for Friction Torque

GB/T 33624 Rolling Bearings - Test and Assessment Methods for Cleanliness

GB/T 34891 Rolling Bearings - Parts Made from High-carbon Chromium Bearing Steels - Specifications for Heat Treatment

JB/T 6641 Rolling Bearings - Residual Magnetism and Its Assessment Method

JB/T 7048 Rolling Bearing Parts - Plastic Cage - Specifications

JB/T 7051 Rolling Bearing Parts - Methods for the Measurement and Assessment of Surface Roughness

JB/T 10336 Rolling Bearings and Parts - Supplementary Specifications

3 Terms and Definitions

What is defined in GB/T 6930 and GB/T 30819, and the following terms and definitions are applicable to this Standard.

3.1 Flexible Bearings

Flexible bearings refer to bearings whose inner and outer ring have a relatively thin wall thickness, and which are installed on the cam, and can generate corresponding elastic deformation with different cam contour curves during the operation.

3.2 Harmonic Gear Reducers

Harmonic gear reducers refer to a transmission device that utilizes a wave generator to make flexible gears generate controllable elastic deformation waves and implements movement and power transmission through the interaction with the rigid gears.

4 Symbols

What is listed in GB/T 4199 and GB/T 7811, and the following symbols are applicable to this document. tempered at a high temperature. After quenching and tempering, the hardness difference of the same ring shall satisfy:

---D <= 100 mm, the hardness difference is not greater than 0.5 HRC;

---D > 100 mm, the hardness difference is not greater than 1.0 HRC.

The residual Austenite content of the rings after the quenching and tempering treatment does not exceed 5%. The rings shall receive dimensional stability treatment.

The quality of other thermal treatments shall comply with the stipulations of GB/T 34891.

The steel balls are made of high-grade and high-quality GCr15 steel that complies with the stipulations of GB/T 18254. The other technical requirements shall comply with the stipulations of GB/T 308.1.

7 Technical Requirements

7.1.2 Cages

The cages are made of engineering plastics PA66-GF25 or PA66; the raw materials and technical requirements shall comply with the stipulations of JB/T 7048. Or, the cages may also be made of 08 and 10 cold-rolled low-carbon thin steel plates; the raw materials and technical requirements shall comply with the stipulations of GB/T 28268; the strength of the plates shall satisfy the requirements of elastic deformation of the bearings.

7.2 Tolerances

The tolerances of the bearings shall comply with the stipulations of Grade-SP (see Table 2 and Table 3). The bearings may also adopt other tolerance grades specified in GB/T 307.1. in GB/T 30819. In other words, under the conditions of correct installation, proper lubrication, and normal operating temperature and humidity, when the input speed of the harmonic gear reducers is 2,000 r/min, and it is a rated torque, the designed life of the bearings shall satisfy:

---When applied to Type-CS (cup-shaped standard flexible bearings) and Type-HS (hollow top hat-shaped standard flexible bearings) reducers, the designed life shall be not lower than 10,000 h;

---When applied to Type-CD (cup-shaped short flexible bearings) and Type-HD (hollow top hat-shaped short flexible bearings) reducers, the designed life shall be not lower than 8,000 h.

7.9.2 Durability

After the durability test, the basic parameters and performance of the bearings shall comply with the requirements of this Standard.

7.10 Others

The other technical requirements shall comply with the stipulations of GB/T 307.3 and JB/T 10336, and the requirements for bearings of harmonic gear reducers specified in GB/T 30819. If there are special requirements, they may be determined by the manufacturer and the user through negotiation.

8 Inspection and Test Methods

8.1 Tolerances

The measurement method for the tolerances of bearings shall comply with the stipulations of GB/T 307.2, or, it may be replaced by the measurement of the tolerances of rings. The inner diameter and outer diameter may be measured through the mode of non-contact measurement.

8.2 Radial Internal Clearance

The measurement method for the radial internal clearance of bearings shall comply with the stipulations of GB/T 25769.

8.3 Surface Roughness

The measurement method for the surface roughness of bearings shall comply with the stipulations of JB/T 7051.

8.4 Residual Magnetism

The measurement method for the residual magnetism of bearings shall comply with […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 16 pages — is available in the English PDF.

Referenced standards

Normative references

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