Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of National Technical Committee on Hydropneumatic of Standardization Administration of China (SAC/TC 3).
Rotary shaft lip-type seals - Determination of friction torque
1 Scope
This standard specifies the determination method of friction torque of rotary shaft lip-type seals.
This standard is applicable to determining the friction torque of rotary shaft lip-type seals (hereinafter referred to as seals).
2 Normative references
The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 13871.2 Rotary shaft lip-type seals incorporating elastomeric sealing elements - Part 2: Vocabulary
GB/T 13871.4-2007 Rotary shaft lip type seals incorporating elastomeric sealing elements - Part 4: Performance test procedures
GB/T 21283.2 Rotary shaft lip-type seals incorporating thermoplastic sealing elements - Part 2: Vocabulary
HG/T 2069 Technical specification for two-axle radial force determinator for rotary shaft lip-type seals
3 Terms and definitions
For the purpose of this document, the terms and definitions given in GB/T 13871.2 and GB/T 21283.2 apply.
4 Test equipment
4.1 The friction torque test equipment shall consist of an adjustable eccentric housing, a rotating part and a torque sensor. See Figure 1 for the schematic diagram of a typical test equipment.
4.2 The precision of torque sensor shall not be lower than ±0.5% FSR; other parts shall meet the requirements of GB/T 13871.4-2007, 5.1.
Note: FSR is the abbreviation of Full-Scale Range.
5 Specimen
At least three seal specimens shall be available.
6 Measurement prior to the test
The following data shall be measured prior to the test:
a) the outside diameter and roundness of the specimen;
b) the diameter of the column lip of the specimen;
c) the diameter of the minor lip of the specimen (if any);
d) measure the radial force of the major lip of the specimen according to HG/T 2069;
e) diameter and surface roughness of the housing bore of the seal;
f) diameter, surface roughness and surface hardness of test shaft.
Keys:
1——test liquid housing;
2——heating belt;
3——liquid filling bucket;
4——gas filling nozzle;
5——seal housing;
6——pulley;
7——main shaft;
8——specimen;
9——test shaft;
10——torque sensor;
11——test liquid;
d1——diameter of test shaft;
D——diameter of the housing bore of the seal.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test equipment
5 Specimen
6 Measurement prior to the test
7 Test conditions
8 Test procedures
9 Test results
10 Test report
Annex A (Informative) Test report on friction torque of rotary shaft lip-type seals
