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JB/T 9050.1-1999 PDF in English


JB/T 9050.1-1999 (JB/T9050.1-1999, JBT 9050.1-1999, JBT9050.1-1999)
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JB/T 9050.1-1999: PDF in English (JBT 9050.1-1999)

JB/T 9050.1-1999
JB
MACHINERY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 21.200
J 19
Replacing ZB J19 009-88
General Technical Requirements of Reduction Cylindrical
Gear Units
ISSUED ON: JUNE 28, 1999
IMPLEMENTED ON: JANUARY 01, 2000
Issued by: State Bureau of Machine Building Industry
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Technical Requirements ... 5
4 Test and Inspection ... 11
5 Marking, Packaging, Transportation and Storage ... 12
6 Manufacturing Warranty ... 12
Appendix A (Standard) Lubrication and Heat Treatment of Gears ... 13
General Technical Requirements of Reduction Cylindrical
Gear Units
1 Scope
This Standard specifies the general technical conditions for cylindrical gear reducers.
This Standard applies to single-stage, two-stage and three-stage cylindrical gear reducers
(hereinafter referred to as reducers) with a center distance of low-speed stage α≤1000mm, and
also applies to single-stage, two-stage and three-stage planetary gear reducer (hereinafter
referred to as reducer) with low-speed turret radius R≤300mm.
2 Normative References
The following standards contain provisions which, through reference in this Standard,
constitute provisions of this Standard. At the time of publication, the editions indicated are valid.
All standards are subject to revision. The parties who are using this Standard shall explore the
possibility of using the latest version of the following standards.
GB 191-1990 Packaging - Pictorial markings for handling of goods
GB/T 1184-1996 Geometrical tolerancing - Geometrical tolerance for features without
individual tolerance indications
GB/T 3480-1988 Calculation of load capacity of spur and helical gears
GB/T 4879-1985 Rustproof packaging
GB/T 6404-1986 Determination of sound power level for noise emitted by gear units
GB/T 10095-1988 Accuracy of involute cylindrical gears
GB/T 11368-1989 Cleanliness of gear units
GB/T 13306-1991 Plates
GB/T 13384-1992 General specification for packaging of mechanical and electrical
products
JB/T 5000.4-1998 General technical conditions of heavy machinery - Iron casting
JB/T 5000.8-1998 General technical conditions of heavy machinery - Forging
JB/T 5000.9-1998 General technical conditions of heavy machinery – Cutting
JB/T 5000.12-1998 General technical conditions of heavy machinery – Coating
JB/T 8831-1999 Methods for oil selection of industrial enclosed gears
JB/T 8853-1999 Reduction cylindrical gear units
JB/T 9050.3-1999 Load test method of reduction cylindrical gear units
3 Technical Requirements
3.1 General technical requirements
3.1.1 The reducer is allowed to work normally within the following ranges:
a) The ambient temperature is -40 ~ +40 ℃:
NOTE: When the ambient temperature is lower than 0 ℃, the lubricating oil shall be preheated before
starting.
b) If the load is stable or changing, and the running direction shall be indicated during
continuous operation:
c) It is suitable for one-way or reversible operation, and the direction of operation shall be
indicated for one-way operation:
d) The maximum speed of the high-speed shaft does not exceed 1500r/min;
NOTE: When the speed of the high-speed shaft exceeds 1500r/min, the technical requirements of the
reducer shall be determined through negotiation between the manufacturer and the user.
e) The peripheral speed of the external meshing involute cylindrical gear does not exceed 20m/s.
The peripheral speed of the internal meshing involute cylindrical gear does not exceed 15m/s;
f) The working environment of the reducer shall be corrosion-free;
g) For the lubricating oil of the reducer, see Appendix A (standard).
3.1.2 The basic parameters such as center distance, transmission ratio, tooth width coefficient
and center height of cylindrical gear reducer shall comply with the provisions of JB/T 8853.
3.1.3 The reducer shall be allowed to withstand the load of twice the short-term overload
generated when the motor is started. The total cycle time allowed for short-term overloading
shall be specified in the standard or technical conditions of the specific model of reducer.
4.2 The reducer manufacturer shall have a complete inspection record file. Qualified products
shall be issued a certificate of conformity.
5 Marking, Packaging, Transportation and Storage
5.1 Each product must have a fixed sign at a conspicuous position, and its requirements shall
comply with the provisions of GB/T 13306, and indicates:
a) Product model and name:
b) Main technical parameters (such as speed, power, torque, weight, etc.):
c) Date of manufacture:
d) Product number:
e) The name of the manufacturer.
5.2 Packaging and transportation of product
5.2.1 Coat the outer surface of the shaft extension and the key of the reducer with anti-rust
grease; and wrap it tightly with plastic cloth; or take other protective measures.
5.2.2 Gears, shafts and bearings of the reducer shall be coated with lubricating grease.
5.2.3 The packaging, storage and transportation of the reducer shall comply with the provisions
of GB/T 13384 and GB 191.
5.3 The accompanying documents shall be packed in plastic bags and put into wooden boxes,
whose contents shall include:
a) Complete set of delivery list and packing list:
b) Certificate of conformity:
c) Product installation and operating instructions, etc.
6 Manufacturing Warranty
If the user complies with the transportation, storage, installation and use conditions stipulated
in this Standard and product standards and related documents, when the reducer is damaged or
cannot work normally due to poor manufacturing quality within one year from the date of
delivery, the manufacturer shall provide the free repair or replacement for the user.
Medium-hard tooth surface quenched and tempered gears are below 360HB:
NOTE: The hardness value shall be selected according to the value on the Brinell hardness scale.
b) For important gears, the requirements for material mechanical performance tests and non-
destructive testing can be added.
NOTE: Important gears (the same below) refer to the gears calculated by MQ and MF according
to the middle limit and upper limit of the fatigue limit in the block diagram of GB/T 3480.
A2.3 Technical requirements for carburized and quenched gears:
a) tooth surface hardness; 57+4HRC:
b) Effective hardened layer depth: (0.15~0.25) mn, mm;
c) Gear heart hardness: 30~46HRC:
d) There shall be no cracks on the tooth surface;
e) For important gears, mechanical performance tests of materials can be added.
A2.4 Technical conditions for induction hardened gears:
a) Tooth surface hardness: 48~56HRC (50~56HRC for important gears);
b) The effective hardened layer depth of the tooth surface (0.15~0.35) mn, mm;
The deviation of the effective hardened layer depth of the tooth surface is generally not
specified, and the important gear is 15% of the effective hardened layer depth;
c) Tooth bottom hardness: >40HRC (important gear >45HRC);
Depth of tooth bottom hardened layer: (0.10~0.30) mn, mm;
Depth deviation of tooth bottom hardened layer is generally not specified:
d) Hardness of tempered core;
e) The tooth surface must not have cracks:
f) Important gear materials shall be tested for mechanical properties.
A2.5 Nitriding gears
Generally, it is only suitable for gears with stable load or thin-walled structure and complex
shape with mn ≤ 10mm.
a) tooth surface hardness
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.