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GB/T 14231-2021: Determination of efficiency for gear units
Status: Valid GB/T 14231: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 14231-2021 | English | 259 |
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Determination of efficiency for gear units
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GB/T 14231-2021
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| GB/T 14231-1993 | English | 399 |
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Determination of efficiency for gear units
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GB/T 14231-1993
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PDF similar to GB/T 14231-2021
Basic data | Standard ID | GB/T 14231-2021 (GB/T14231-2021) | | Description (Translated English) | Determination of efficiency for gear units | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J17 | | Word Count Estimation | 14,189 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 14231-2021: Determination of efficiency for gear units---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of efficiency for gear units
ICS 21.200
J17
National Standards of People's Republic of China
Replace GB/T 14231-1993
Gear unit efficiency measurement method
Released on 2021-03-09
2021-10-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅲ
1 Scope 1
2 Normative references 1
3 Symbol 1
4 Test equipment 2
4.1 Accuracy level 2
4.2 Calibration 2
5 Test requirements 2
6 Test method 3
6.1 Direct power measurement method 3
6.2 Loss power method 4
7 Test procedure and data processing 5
7.1 Test Step 5
7.2 Data Processing 6
8 Records and reports 8
8.1 Record content 8
8.2 Report content 8
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 14231-1993 "Method for Measuring the Efficiency of Gear Units". Compared with GB/T 14231-1993, the main technology
The changes are as follows.
--- Change the title of Chapter 3 "Main Code" to "Symbols" (see Chapter 3, Chapter 3 of the.1993 edition);
--- Use the test instrument specified in JJG924 that is no less than 1 or 0.5, or other test instruments with equivalent accuracy in 4.1
"The instrument" is changed to "The accuracy of the test instrument should not be lower than the level 0.5 specified in JJG924 (or equivalent). "(See 4.1,.1993 edition
4.1);
--- Change the "testing instrument used in the test must be qualified by the relevant measurement department, and should be used within the validity period." changed to "test
The test equipment should meet the requirements of JB/T 6876 and JB/T 6877."(See 4.2, 4.2 of the.1993 edition);
--- Incorporated "5.1 Test Conditions" and "5.2 Installation and Connection of Gear Units and Instruments", adapted to Chapter 5, and added "Or by industry
"Consultation between the two parties" and other content (see Chapter 5, Chapter 5 of the.1993 edition);
---Changed formula (3) [see formula (3),.1993 version of formula (3)];
--- Deleted "b) given the torque efficiency curve in 8.2; c) given the speed efficiency curve" (see 8.2 in the.1993 edition).
This standard was proposed and managed by the National Gear Standardization Technical Committee (SAC/TC52).
Drafting organizations of this standard. Zhengzhou High-end Equipment and Information Industry Technology Research Institute Co., Ltd., Zhengzhou Machinery Research Institute Co., Ltd., Shaanxi
Fast Gear Co., Ltd., Dongbei Special Steel Group Shandong Yinglun Machinery Co., Ltd., Nanjing Sanchuang Automation Technology Co., Ltd., Zhengzhou
China Railway Transportation Equipment Technology Co., Ltd., Jiangsu Zhonggong High-end Equipment Research Institute Co., Ltd., China Machinery Productivity Promotion Center.
The main drafters of this standard. Wang Wei, Zhang Yuanguo, Liu Yi, Lu Pangong, Guan Hongjie, Guo Guirong, Gong Zongyang, Zhang Xiangru, Ding Jun, Wang Zhigang,
Hou Shengwen, Fan Ruili, Ma Pintian, Gong Yu, Li Haixia, Xiang Xun, Yu Feipeng, Hou Nai, Li Jinfeng, Huang Shoufeng, Chen Sheng, Qiu Guolin, Mao Yongming.
The previous editions of the standard replaced by this standard are as follows.
---GB/T 14231-1993.
Gear unit efficiency measurement method
1 Scope
This standard specifies the test equipment, test requirements, test methods, test procedures, data processing, and records for the gear transmission efficiency bench
And report.
This standard is applicable to the efficiency determination of gear devices with independent closed box bodies that transmit power.
This standard does not apply to the efficiency measurement of certain special units, such as compressors, pumps, and engines integrated with transmission gears, or those that do not use transmission gears.
Gear devices whose main purpose is to transmit power.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
JB/T 6876 Torque Speed Sensor
JB/T 6877 Torque and Speed Measuring Instrument
JJG924 Verification Regulation of Torque and Speed Measuring Device
3 symbols
The symbols listed in Table 1 apply to this document.
4 Test equipment
4.1 Accuracy class
The accuracy of the testing instrument should not be lower than the level 0.5 specified in JJG924 (or equivalent).
4.2 Calibration
The test instrument should meet the requirements of JB/T 6876 and JB/T 6877.
Before testing, make preparations for the zero point adjustment of the instrument according to the operating requirements.
5 Test requirements
When the tested gear device is tested, it should be installed, debugged, and run-in according to the following requirements, and the test conditions should be determined.
a) The tested gear device should be installed and tested according to the designed power flow transmission direction.
b) The rotation direction of each extension shaft of the tested gear device should meet the design requirements.
c) The connection form of the tested gear device, test instrument and other equipment on the test bench shall comply with the provisions of Chapter 6.
d) The coaxiality error when the gear device is connected to the sensor should meet the requirements of the sensor; the weight of the coupling should also meet the transmission requirements.
Requirements for the use of sensors.
e) System errors caused by power loss caused by other accessories (such as couplings, etc.) on the test bench and equipment installation errors should be considered.
Rate measurement value.
f) The tested gear device should maintain the same lubrication (such as oil product, oil volume) as required by the design.
g) The tested gear device should be pre-run-in according to the design requirements.
h) The test speed of the tested gear device is selected as follows.
--- Gear devices used at a fixed speed should be designed according to the nominal speed;
---For gear devices used at non-fixed speeds, the corresponding transmission efficiency under different speed and torque conditions should be tested according to the load spectrum.
According to the actual situation, use the transmission efficiency value; in the case of no load spectrum, it should generally be based on the rated rotation of the prime mover.
Speed as the test speed.
---When the user requires the efficiency to be measured at different speeds, the test speed can be determined through negotiation.
i) When testing, the value should be carried out within the design and use temperature range of the gear device and in the thermal equilibrium state.
The thermal equilibrium state is determined by the following method.
---In the test, when the temperature of the gear device does not change more than 1°C within a period of 30 minutes, it is considered to be a thermal equilibrium state;
---Or according to the corresponding industry standards;
---Or negotiated by both parties.
j) During the test, when the transmission of the gear device is relatively large or the output speed is in the low-speed section, the loading device will have unstable speed and torque
Certain conditions. At this time, attention should be paid to the accuracy of the test efficiency and the safety of the test device.
6 Test method
6.1 Direct power measurement method
6.1.1 Interpretation
On the test bench, the instrument directly measures the input and output torque and speed of the gear device, and then determines the method of its transmission efficiency.
6.1.2 Selection conditions
According to the following conditions.
---When the design efficiency value is < 98%;
---Although the design efficiency value is ≥98%, the accuracy of the test instrument is high, there will be no abnormal results, and loss of power should not be used
Law time.
6.1.3 Installation form and calculation formula
6.1.3.1 Single unit direct measurement power method
The installation form and calculation formula requirements of the single direct measurement power method are as follows.
a) Installation form. Install the gear device between two torque and speed sensors on the test bench, as shown in Figure 1.
6.1.3.2 Two-station direct power measurement method
The installation form and calculation formula requirements of the two-unit direct measurement power method are as follows.
a) Installation form. The two sets of specifications, models and manufacturing levels are the same on the test bench, and can be transmitted in both directions according to the design power flow.
(), 2.
b) Calculation formula. The calculation of the measured gear unit efficiency value η after average is shown in formula (2).
6.2 Loss power method
6.2.1 Interpretation
A method to determine the transmission efficiency of a gear device by measuring the power loss.
6.2.2 Selection conditions
This method should be used when the input and output shafts of the tested gear device are located in parallel on the same side of the device and the design efficiency is ≥98%.
6.2.3 Installation form and calculation formula
The installation form and calculation formula requirements of the loss power method are as follows.
a) Installation form. The gear device is installed on a test bench with a closed transmission, as shown in Figure 3.Among them, the tested gear device and the accompanying test gear device
The specifications, models and manufacturing levels should be exactly the same, and their efficiency can be regarded as equal.
b) Calculation formula. The calculation of the efficiency value η of the tested gear device is shown in formula (3).
7 Test procedure and data processing
7.1 Test procedure
The test steps are as follows.
a) Before measurement, preparations should be made in accordance with the requirements of Chapter 4 and Chapter 5.
b) Under the specified conditions, read the torque and speed display values of two measuring instruments at the same time as a set of data, and fill in Table 2.Total data
5 groups to 10 groups are required, and the observation time of each group should not be less than 10s, and the observation value can be recorded after the reading is stable.
7.2 Data processing
7.2.1 Efficiency calculation
Calculate and compare the data in Table 2 according to the following steps until the final value is obtained.
a) Calculate the arithmetic average of a certain column of data according to formula (5).
σno---The standard error of the rotational speed measured by the sensor at the output, in units of revolutions per minute (r/min).
8 Records and reports
8.1 Record content
8.1.1 Basic requirements
It should contain at least the following.
a) Test purpose;
b) The main technical parameters, factory number and date of the tested gear device;
c) The installation diagram of the test bench;
d) Test conditions (measurement equipment, ambient temperature, lubrication status, etc.);
e) Test method;
f) Test results.
8.1.2 Test equipment
8.1.3 Measurement data
Record the measurement data according to Table 2.
8.1.4 Data processing results
Calculate, process and record the torque and speed values of each group in accordance with the requirements of 7.2.1.
8.1.5 Other
Testing unit, testing personnel, time and location.
8.2 Report content
The measurement report should include the following.
a) What is involved in 8.1;
b) The gear unit efficiency value calculated in accordance with 7.2.1;
c) The measurement error value calculated in accordance with 7.2.2.
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