JB/T 9050.1-2015 PDF in English
JB/T 9050.1-2015 (JB/T9050.1-2015, JBT 9050.1-2015, JBT9050.1-2015)
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Cylindrical reduction gear units. Part 1: General technical requirement
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| JB/T 9050.1-1999 | English | 470 |
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General technical requirement of reduction cylindrical gear units
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Standards related to (historical): JB/T 9050.1-2015
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JB/T 9050.1-2015: PDF in English (JBT 9050.1-2015) JB/T 9050.1-2015
JB
MACHINERY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 21.200
J 19
Record No.: 49981-2015
Replacing JB/T 9050.1-1999
Cylindrical Reduction Gear Units - Part 1: General
Technical Requirement
ISSUED ON: APRIL 30, 2015
IMPLEMENTED ON: OCTOBER 01, 2015
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Technical Requirements ... 6
3.1 General requirements ... 6
3.2 Technical requirements for gear manufacturing ... 8
3.3 Manufacturing technical requirements for machine body ... 9
3.4 Technical requirements for assembly ... 10
4 Test ... 11
5 Inspection ... 11
6 Marking, Packaging and Transportation ... 11
6.1 Sign board ... 11
6.2 Product packaging and transportation ... 11
6.3 Accompanying files ... 11
Appendix A (Informative) Heat Treatment of Gears ... 13
Foreword
This Part was drafted as per the rules specified in GB/T 1.1-2009.
JB/T 9050 Cylindrical Reduction Gear Units can be divided into the following 3 parts:
--- Part 1: General Technical Requirements.
--- Part 2: The Determination Method for Contact Spot of Cylindrical Gear;
--- Part 3: Basic Parameters.
This Part is Part 1 of JB/T 9050.
This Part replaced JB/T 9050.1-1999 General Technical Requirements of Reduction Cylindrical
Gear Units. Compared with JB/T 9050.1-1999, the major technical changes of this Part are as
follows:
--- Modify the scope of application (see Clause 1 of this Edition; Clause 1 of the 1999
Edition);
--- Modify the normal working range of the reducer (see 3.1.1 of this Edition; 3.1.1 of the
1999 Edition);
--- Delete the provisions on the center distance, transmission ratio, tooth width coefficient,
and center height of the reducer (see 3.1.2 of the 1999 Edition);
--- Delete the provisions on the radial load of shaft extension of the input and output shafts
(see 3.1.4 of the 1999 Edition);
--- Modify the provisions of gear precision (see 3.1.4 of this Edition; 3.1.6 of the 1999
Edition);
--- Modify the provisions on tooth surface contact spots of hardened gear pairs and medium
hardened gear pairs (see 3.1.5 of this Edition; 3.1.7 of the 1999 Edition);
--- Modify the provisions on the minimum normal limit backlash of the gear pair; and added
the provisions on the minimum backlash of the gear (see 3.1.6 of this Edition; 3.1.8 of
the 1999 Edition);
--- Delete the provisions on the degree of coincidence between the body and the cover of
the reducer (see 3.1.10 of the 1999 Edition);
--- Modify the provisions on the cleanliness of the reducer inner cavity and its inspection
method (see 3.1.9 of this Edition; 3.1.12 of the 1999 Edition);
--- Modify the provisions on electric power per unit area during electric heating (see 3.1.13
Cylindrical Reduction Gear Units - Part 1: General
Technical Requirement
1 Scope
This Part of JB/T 9050 specifies the technical requirements, testing, inspection and marking,
packaging and transportation of cylindrical gear reducers.
This Part applies to single-stage, two-stage, three-stage and four-stage cylindrical gear reducers
(hereinafter referred to as reducers) with a center distance α≤1000 mm at the low-speed stage;
and also applies to single-stage, two-stage and three-stage planetary gear reducers (hereinafter
referred to as reducers) with planetary carrier radius R≤300 mm at the low-speed stage.
2 Normative References
The following documents are essential to the application of this Document. For the dated
documents, only the versions with the dates indicated are applicable to this Document; for the
undated documents, only the latest version (including all the amendments) is applicable to this
Document.
GB/T 191 Packaging – Pictorial Marking and Handling of Goods
GB/T 1184-1996 Geometrical tolerancing - Geometrical tolerance for features without
individual tolerance indications
GB/T 3480-1997 Calculation methods of load capacity for involute cylindrical gears
GB/T 10095.1-2008 Cylindrical gears - System of accuracy - Part 1: Definitions and
allowable values of deviations relevant to corresponding flanks of gear teeth
GB/T 13306 Plates
GB/T 13384 General specifications for packing of mechanical and electrical product
GB/Z 18620.2 Cylindrical gears - Code of inspection practice - Part 2: Inspection related
to radial composite deviations runout tooth thickness and backlash
JB/T 5000.3 Heavy mechanical general techniques and standards - Part 3: Standards
welding
JB/T 5000.4 Heavy mechanical general techniques and standards – Part 4: Iron casting
JB/T 5000.12 Heavy mechanical general techniques and standards - Part 12: Paint
JB/T 7929-1999 Cleanliness for gear drive units
JB/T 8831 Methods for oil selection of industrial enclosed gears
JB/T 5558 Test method of reduction (increase) gear units
3 Technical Requirements
3.1 General requirements
3.1.1 Reducer is allowed to normally work under the following range:
a) Ambient temperature is -20°C ~ 45°C.
NOTE 1: When the ambient temperature is lower than 0°C, the lubricating oil shall be preheated
before starting.
b) The maximum speed of the high-speed shaft shall not exceed 3000 r/min.
NOTE 2: When the speed of the high-speed shaft exceeds 1800 r/min, the technical requirements
of the reducer shall be determined through consultation between the manufacturer and the user.
c) The peripheral speed of external meshing involute cylindrical gears shall not exceed 25
m/s, and the peripheral speed of internal meshing involute cylindrical gears shall not
exceed 20 m/s.
d) The working environment of the reducer shall be a corrosion-free.
e) The selection of lubricating oil for the reducer shall comply with the provisions of JB/T
8831.
3.1.2 The reducer shall be allowed to withstand the load of twice the short-term overload
generated when the motor starts. The total cycle time of the permissible short-term overload
shall be specified in the standard or technical conditions of the specific type of reducer.
3.1.3 The service life of the reducer is no less than 25 000 h. The service life of bearing is no
less than 10 000 h.
3.1.4 The precision of gears shall be no lower than the provisions in Table 1.
3.1.9 The cleanliness of the inner cavity of the reducer shall comply with the provisions of Class
C in JB/T 7929-1999.
3.1.10 The position error of the centerline of the anchor bolt hole shall be no greater than 0.2
(D-d) mm.
NOTE: D - the nominal diameter of the anchor screw hole, in millimeters (mm); d - the nominal diameter
of the anchor bolts, in millimeters (mm).
3.1.11 The materials used for the main parts of the reducer (gear, shaft and machine body, etc.)
shall meet the requirements of the relevant current material standards, and have the certificate
of conformity from the manufacturer.
3.1.12 In addition to calculating the rated transmission power, the hardened gear reducer and
planetary gear reducer shall also calculate the thermal power to determine the lubrication and
cooling method and whether it is necessary to increase the lubrication and cooling device.
3.1.13 When the reducer is in a low-temperature working environment, electric heaters or steam
heaters can be used for heating, and the heaters shall be located below the oil surface of the
lubricating oil. When electric heating is used, the electric power per unit area shall not exceed
1.0W/cm2 to prevent carbonization of lubricating oil.
3.1.14 The transmission efficiency of each stage of single-stage or multi-stage cylindrical gear
reducer is no less than 0.98, and the transmission efficiency of each stage of single-stage or
multi-stage planetary gear reducer is no less than 0.97.
3.2 Technical requirements for gear manufacturing
3.2.1 Gear precision inspection shall be carried out in accordance with the provisions of GB/T
10095.1-2008; and the items to be inspected are shown in Table 4 of this Standard. Other non-
compulsory inspection items shall be determined by the manufacturer.
3.2.2 The surface roughness of the tooth surface shall comply with provisions of Table 5.
4 Test
The test of the reducer shall comply with the provisions of JB/T 5558.
5 Inspection
The inspection of the reducer shall be carried out according to the requirements in Clause 3.
The reducer manufacturer shall have a complete inspection record file. Qualified products shall
be issued a certificate of conformity.
6 Marking, Packaging and Transportation
6.1 Sign board
Each product must have a fixed sign board at a conspicuous position, and its requirements
should comply with the provisions of GB/T 13306, and indicate:
a) Product model and name;
b) Main technical parameters (such as speed, power, torque, weight, etc.);
c) Date of manufacture;
d) Product number;
e) Manufacturer's name.
6.2 Product packaging and transportation
6.2.1 The shaft extension of the reducer and the outer surface of the key are coated with anti-
rust grease; and wrapped tightly with plastic cloth, tied firmly; or other protective measures are
adopted.
6.2.2 Gears, shafts and bearings of the reducer shall be coated with lubricating grease.
6.2.3 The packaging, storage and transportation of the reducer shall comply with the provisions
of GB/T 13384 and GB/T 191.
6.3 Accompanying files
It should be packed in a plastic bag and put into a wooden box, the contents of which include:
a) Complete delivery list and packing list;
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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