Skip to product information
1 of 6

PayPal, credit cards. Download editable-PDF & invoice In 1 second!

GB/T 34884-2017 English PDF (GBT34884-2017)

GB/T 34884-2017 English PDF (GBT34884-2017)

Regular price $165.00 USD
Regular price Sale price $165.00 USD
Sale Sold out
Shipping calculated at checkout.
Quotation: In 1-minute, 24-hr self-service. Click here GB/T 34884-2017 to get it for Purchase Approval, Bank TT...

GB/T 34884-2017: Rolling bearings -- Flexible bearings for harmonic drive gear reducers of industrial robots

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. This Standard is applicable to the production, inspection and acceptance inspection of bearings.
GB/T 34884-2017
GB
NATIONAL STANDARD OF THE
PEOPLE 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 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

View full details