GB/T 34884-2017 English PDF (GB/T34884-2017)

GB/T 34884-2017: Rolling Bearings - Flexible Bearings for Harmonic Drive Gear Reducers of Industrial Robots
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GB/T 34884-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.20
J 11
Rolling Bearings - Flexible Bearings for Harmonic
Drive Gear Reducers of Industrial Robots
ISSUED ON: NOVEMBER 1, 2017
IMPLEMENTED ON: MAY 1, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 5 
4 Symbols ... 5 
5 Identification Code ... 6 
6 Overall Dimensions ... 7 
7 Technical Requirements ... 9 
8 Inspection and Test Methods ... 13 
9 Inspection Rules ... 14 
10 Marking ... 15 
11 Rust Proof Packaging... 15 
Appendix A (normative) Overall Dimensions of Some Inch Series Bearings .. 16 
Rolling Bearings - Flexible Bearings for Harmonic
Drive Gear Reducers of Industrial Robots
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.
7.1.2 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
GB/T 34884-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.20
J 11
Rolling Bearings - Flexible Bearings for Harmonic
Drive Gear Reducers of Industrial Robots
ISSUED ON: NOVEMBER 1, 2017
IMPLEMENTED ON: MAY 1, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 5 
4 Symbols ... 5 
5 Identification Code ... 6 
6 Overall Dimensions ... 7 
7 Technical Requirements ... 9 
8 Inspection and Test Methods ... 13 
9 Inspection Rules ... 14 
10 Marking ... 15 
11 Rust Proof Packaging... 15 
Appendix A (normative) Overall Dimensions of Some Inch Series Bearings .. 16 
Rolling Bearings - Flexible Bearings for Harmonic
Drive Gear Reducers of Industrial Robots
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.
7.1.2 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 Toler...