GB/T 35472.7-2017Test method for friction element of wet automatic transmission - Part 7: Band friction test procedure (English PDF)
湿式自动变速箱摩擦元件试验方法 第7部分：带式摩擦试验方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 29, 2017
Implementation date
November 1, 2018
Scope
GB/T 35472.7-2017 is the English-translated version of 湿式自动变速箱摩擦元件试验方法 第7部分：带式摩擦试验方法.
GB/T 35472.7-2017 is the Chinese standard "Test method for friction element of wet automatic transmission - Part 7: Band friction test procedure".
Its scope clause reads: This section GB/T 35472 specifies the use of SZBL friction test machine wet friction test friction belt components Preparation, typical test conditions and parameters, test procedures.
This section applies to the measurement and evaluation of friction in the wet automatic gearbox friction element performance is also suitable for testing its Durability.
Its clauses include test equipment; typical test conditions and test parameters.
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Document preview — GB/T 35472.7-2017
National Standard of the People's Republic of China
- ICS
- 43.040.40
- Classification
- Q 69
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 test equipment
- 4 typical test conditions and test parameters
1 Scope
This section GB/T 35472 specifies the use of SZBL friction test machine wet friction test friction belt components
Preparation, typical test conditions and parameters, test procedures.
This section applies to the measurement and evaluation of friction in the wet automatic gearbox friction element performance is also suitable for testing its
Durability.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 35472.2 wet automatic gearbox friction element test methods - Part 2 .SZBL friction test machine use guide
3 test equipment
The test equipment is a SZBL type friction tester with static engagement device. Its performance and accuracy should be consistent with the provisions of GB/T 35472.2.
The inertia configuration is 0.1kg · m2 ~ 0.7kg · m2. Should also be equipped with suitable test drums, struts and bearings.
4 typical test conditions and test parameters
4.1
Piston area of 7000mm2 ~ 14000mm2.
4.2
Piston effective stroke 11.0mm.
4.3
The effect pressure reaches 900 (1 ± 0.5%) kPa.
4.4
pressure rise rate of 2.0MPa/s ~ 3.0MPa/s.
4.5
The piston should provide back pressure 30kPa ~ 40kPa pressure, and clear the load pressure relief is completed.
4.6
The total inertia range of 0.1kg · m2 ~ 0.7kg · m2.
4.7
dynamic bonding speed 1000r/min ~ 10000r/min.
4.8
kinetic energy of 30kJ ~ 50kJ.
4.9
Static bonding speed of 0r/min ~ 4.5r/min.
4.10
refueling volume is 0.6L ~ 2.0L.
4.11
test oil temperature at 80 °C ~ 150 °C, oil temperature control error ± 3 °C.
4.12
with interface clearance of 0.20mm ~ 0.45mm.
4.13
In the friction test, a series of processes such as the sliding period, the pressurization period and the cooling period repeatedly occurred when the oil temperature is stable and reached the required speed are
One cycle. One cycle may include waiting periods, wetting periods, and static mating periods when performing static tests.
4.15
chamber pressure is not greater than 15kPa.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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Related Standards
GB/T 35472.6-2017 — Test method for friction element of wet automatic transmission - Part 6: µ-PVT test method
GB/T 35472.5-2017 — Test method for friction element of wet automatic transmission—Part 5: Durability test method
GB/T 35472.4-2017 — Test method for friction element of wet automatic transmission—Part 4: High-speed stepped power test method
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