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 Directives for standardization - Part 1: Structure and drafting of standards.
This standard replaces QC/T 29063.1-2011 Technical specification for auto manual transmission assembly - Part 1: Mini-vehicle and QC/T 568.1-2011 Rig testing method for auto manual transmission assembly - Part 1: Mini-vehicle. This standard is prepared based on QC/T 29063.1-2011 and by integrating the content of QC/T 568.1-2011. In addition to editorial changes, the following main technical changes have been made with respect to QC/T 29063.1-2011:
——The standard name is modified from to Technical specification for auto manual transmission assembly - Part 1: Mini-vehicle to The specification & bench test methods for manual transmission (MT) assembly;
——The scope of the standard is revised (see Clause 1), and the specification and the content of bench test methods are expanded accordingly (see Clauses 4 and 5);
——The inspection rules, marking, packaging, transportation, storage, quality assurance and the like are deleted (see Clauses 7, 8 and 9 of Edition 2011);
——Annex A "Transmission off-gear road test" is deleted (see Annex A of Edition 2011).
This standard was proposed by and is under the jurisdiction of SAC/TC 114 National Technical Committee of Auto Standardization.
The previous editions of this standard are as follows:
The previous editions of QC/T 29063.1-2011 are as follows:
——JB 4125-1985;
——QC/T 29063-1992.
The previous editions of QC/T 568.1-2011 are as follows:
——JB/T 3987-1985;
——QC/T 568-1999.
The specification & bench test methods for manual transmission (MT) assembly
1 Scope
This standard specifies the specification and the corresponding bench test methods for manual transmission (MT) assembly.
This standard is applicable to the manual transmission (MT) assembly (hereinafter referred to as "transmission") of motor vehicles of Categories M and N.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 6461 Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates - Rating of test specimens and manufactured articles subjected to corrosion tests
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
GB/T 15089 Classification of power-driven vehicles and trailers
GB/T 30512 Requirements for prohibited substances on automobiles
QC/T 465 Automotive mechanical transmission terminology and definition
QC/T 941 Test methods of mercury in automobiles materials
QC/T 942 Test methods of hexavalent chromium in automobiles materials
QC/T 943 Test methods of lead and cadmium in automobiles materials
QC/T 944 The methods of polybrominated biphenyls and polybrominated diphenyl ethers in automotive materials
QC/T 983 Measuring method of cleanliness of automobile manual transmission assembly
3 Terms and definitions
For the purposes of this document, the terms and definitions specified in GB/T 15089 and QC/T 465 and the following apply.
3.1
abnormal noise
noise occurs during transmission working, which is different from that occurs during normal operation of gear and bearing
3.2
synchronous impulse
integral of the horizontal thrust acting on the gear sleeve of synchronizer against the synchronization time during gear shifting
3.3
double shock force
horizontal thrust acting on the gear sleeve of synchronizer when the gear sleeve contacts the gear ring and enters the gear ring during gear shifting
3.4
additional transmission
transmission device attached to the front or rear end of the main transmission for increasing the gear and expanding the transmission ratio range of the transmission
4 Specification
4.1 Materials of parts and components
The raw materials of the transmission assembly shall meet the requirements of GB/T 30512.
4.2 Rust prevention
The assembly shall be free from rust. If necessary, the exposed surface of the assembly shall be subjected to rust-proof treatment, and the rust-proof grade shall meet the requirements of GB/T 6461.
4.3 Cleanliness
The undisassembly cleanliness of transmission assembly shall be calculated using Formula (1):
G≤K×Le (1)
where,
G——the actually measured impurity mass of transmission assembly, mg;
K——the objective evaluation coefficient of cleanliness, i.e., impurity content per liter of lubricating oil, mg/L, with the allowable value of K given in Table 1;
Le——the rated volume of lubricating oil of transmission assembly, L.
Table 1 Allowable values of K
Vehicle type Allowable value of K
Category M1 50
Categories M2, M3 and N Without additional transmission 50
With additional transmission 60
4.4 Fatigue life
The test shall be completed according to the method specified in 5.5. During the test, there shall be no abnormal noise, oil leakage and other faults, and the main parts and components shall not be damaged, such as fracture, pitting, spalling and jamming (for tooth surface pitting, passenger car: the cumulative pitting area of a single tooth surface exceeds 4mm2, or the pitting depth exceeds 0.5mm; commercial vehicle: the single pitting area exceeds 4mm2, or the cumulative pitting area of a single tooth surface exceeds 20% of this single tooth surface).
4.5 Gearshift life
For the transmission with synchronizer, the test shall be completed according to the method specified in 5.6, and there shall be no continuous gear failure or five consecutive times of gearshift collision sound or gear collision in any gear.
4.6 Static torsional strength
The test shall be completed according to the method specified in 5.7. The static torsional strength safety factor shall meet the following requirements: for passenger cars, the K value of forward gear and that of reverse gear shall be greater than or equal to 2.5 and 2.0 respectively; for commercial vehicles, the K value shall be greater than or equal to 3.0.
4.7 Transmission efficiency
The test shall be completed according to the method specified in 5.8, and the test results shall be in accordance with those specified in Table 2.
4.8 Noise
The test shall be completed according to the method specified in 5.9, and the test results shall be in accordance with those specified in Table 3.
Table 2 Allowable values of comprehensive transmission efficiency
Vehicle type Allowable value
Category M1 With differential ≥94%
Without differential ≥96%
Categories M2, M3 and N Without additional transmission ≥95%
Categories M2 and M3 — ≤88 (no load) ≤90 (no load)
Category N — ≤90 (no load) ≤92 (no load)
4.9 Gearshift performance
The test shall be completed according to the method specified in 5.10. The synchronous impulse of forward gear shall be in accordance with those specified in Table 4, and the peak value of double shock force shall be lower than 70% of synchronous force. The static gearshift force, static off-gear force and static gear selecting force shall be in accordance with those specified in Table 5.
Table 4 Allowable values of gearshift performance
In: N·s
Vehicle type Gear Synchronous impulse
Category M1 From Gear II to Gear I
Other gears ≤200
≤100
Category M2 From Gear II to Gear I
Other gears ≤600
≤400
Category M3 From Gear II to Gear I
Other gears ≤1,300
≤700
Category N From Gear II to Gear I
Other gears ≤1,600
≤800
4.10 Dynamic sealing performance
The test shall be completed according to the method specified in 5.11, and the transmission assembly shall be free from oil leakage during the test.
4.11 Temperature rise performance
The test shall be completed according to the method specified in 5.12. During the test, the oil temperature of the transmission shall not be higher than the designed maximum allowable oil temperature of the transmission, and the temperature-time curve shall be smooth without abrupt change.
Foreword II 1 Scope 2 Normative references 3 Terms and definitions 4 Specification 5 Bench test methods
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 Directives for standardization - Part 1: Structure and drafting of standards.
This standard replaces QC/T 29063.1-2011 Technical specification for auto manual transmission assembly - Part 1: Mini-vehicle and QC/T 568.1-2011 Rig testing method for auto manual transmission assembly - Part 1: Mini-vehicle. This standard is prepared based on QC/T 29063.1-2011 and by integrating the content of QC/T 568.1-2011. In addition to editorial changes, the following main technical changes have been made with respect to QC/T 29063.1-2011:
——The standard name is modified from to Technical specification for auto manual transmission assembly - Part 1: Mini-vehicle to The specification & bench test methods for manual transmission (MT) assembly;
——The scope of the standard is revised (see Clause 1), and the specification and the content of bench test methods are expanded accordingly (see Clauses 4 and 5);
——The inspection rules, marking, packaging, transportation, storage, quality assurance and the like are deleted (see Clauses 7, 8 and 9 of Edition 2011);
——Annex A "Transmission off-gear road test" is deleted (see Annex A of Edition 2011).
This standard was proposed by and is under the jurisdiction of SAC/TC 114 National Technical Committee of Auto Standardization.
The previous editions of this standard are as follows:
The previous editions of QC/T 29063.1-2011 are as follows:
——JB 4125-1985;
——QC/T 29063-1992.
The previous editions of QC/T 568.1-2011 are as follows:
——JB/T 3987-1985;
——QC/T 568-1999.
The specification & bench test methods for manual transmission (MT) assembly
1 Scope
This standard specifies the specification and the corresponding bench test methods for manual transmission (MT) assembly.
This standard is applicable to the manual transmission (MT) assembly (hereinafter referred to as "transmission") of motor vehicles of Categories M and N.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 6461 Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates - Rating of test specimens and manufactured articles subjected to corrosion tests
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
GB/T 15089 Classification of power-driven vehicles and trailers
GB/T 30512 Requirements for prohibited substances on automobiles
QC/T 465 Automotive mechanical transmission terminology and definition
QC/T 941 Test methods of mercury in automobiles materials
QC/T 942 Test methods of hexavalent chromium in automobiles materials
QC/T 943 Test methods of lead and cadmium in automobiles materials
QC/T 944 The methods of polybrominated biphenyls and polybrominated diphenyl ethers in automotive materials
QC/T 983 Measuring method of cleanliness of automobile manual transmission assembly
3 Terms and definitions
For the purposes of this document, the terms and definitions specified in GB/T 15089 and QC/T 465 and the following apply.
3.1
abnormal noise
noise occurs during transmission working, which is different from that occurs during normal operation of gear and bearing
3.2
synchronous impulse
integral of the horizontal thrust acting on the gear sleeve of synchronizer against the synchronization time during gear shifting
3.3
double shock force
horizontal thrust acting on the gear sleeve of synchronizer when the gear sleeve contacts the gear ring and enters the gear ring during gear shifting
3.4
additional transmission
transmission device attached to the front or rear end of the main transmission for increasing the gear and expanding the transmission ratio range of the transmission
4 Specification
4.1 Materials of parts and components
The raw materials of the transmission assembly shall meet the requirements of GB/T 30512.
4.2 Rust prevention
The assembly shall be free from rust. If necessary, the exposed surface of the assembly shall be subjected to rust-proof treatment, and the rust-proof grade shall meet the requirements of GB/T 6461.
4.3 Cleanliness
The undisassembly cleanliness of transmission assembly shall be calculated using Formula (1):
G≤K×Le (1)
where,
G——the actually measured impurity mass of transmission assembly, mg;
K——the objective evaluation coefficient of cleanliness, i.e., impurity content per liter of lubricating oil, mg/L, with the allowable value of K given in Table 1;
Le——the rated volume of lubricating oil of transmission assembly, L.
Table 1 Allowable values of K
Vehicle type Allowable value of K
Category M1 50
Categories M2, M3 and N Without additional transmission 50
With additional transmission 60
4.4 Fatigue life
The test shall be completed according to the method specified in 5.5. During the test, there shall be no abnormal noise, oil leakage and other faults, and the main parts and components shall not be damaged, such as fracture, pitting, spalling and jamming (for tooth surface pitting, passenger car: the cumulative pitting area of a single tooth surface exceeds 4mm2, or the pitting depth exceeds 0.5mm; commercial vehicle: the single pitting area exceeds 4mm2, or the cumulative pitting area of a single tooth surface exceeds 20% of this single tooth surface).
4.5 Gearshift life
For the transmission with synchronizer, the test shall be completed according to the method specified in 5.6, and there shall be no continuous gear failure or five consecutive times of gearshift collision sound or gear collision in any gear.
4.6 Static torsional strength
The test shall be completed according to the method specified in 5.7. The static torsional strength safety factor shall meet the following requirements: for passenger cars, the K value of forward gear and that of reverse gear shall be greater than or equal to 2.5 and 2.0 respectively; for commercial vehicles, the K value shall be greater than or equal to 3.0.
4.7 Transmission efficiency
The test shall be completed according to the method specified in 5.8, and the test results shall be in accordance with those specified in Table 2.
4.8 Noise
The test shall be completed according to the method specified in 5.9, and the test results shall be in accordance with those specified in Table 3.
Table 2 Allowable values of comprehensive transmission efficiency
Vehicle type Allowable value
Category M1 With differential ≥94%
Without differential ≥96%
Categories M2, M3 and N Without additional transmission ≥95%
With additional transmission ≥93%
Table 3 Allowable values of noise
In: dB(A)
Vehicle type Allowable sound pressure level
Idle neutral Forward (except overspeed gear) Overspeed gear and reverse gear
Category M1 ≤63 Five-speed gearbox: ≤83
Six-speed gearbox: ≤85 Five-speed gearbox: ≤85
Six-speed gearbox: ≤87
Categories M2 and M3 — ≤88 (no load) ≤90 (no load)
Category N — ≤90 (no load) ≤92 (no load)
4.9 Gearshift performance
The test shall be completed according to the method specified in 5.10. The synchronous impulse of forward gear shall be in accordance with those specified in Table 4, and the peak value of double shock force shall be lower than 70% of synchronous force. The static gearshift force, static off-gear force and static gear selecting force shall be in accordance with those specified in Table 5.
Table 4 Allowable values of gearshift performance
In: N·s
Vehicle type Gear Synchronous impulse
Category M1 From Gear II to Gear I
Other gears ≤200
≤100
Category M2 From Gear II to Gear I
Other gears ≤600
≤400
Category M3 From Gear II to Gear I
Other gears ≤1,300
≤700
Category N From Gear II to Gear I
Other gears ≤1,600
≤800
4.10 Dynamic sealing performance
The test shall be completed according to the method specified in 5.11, and the transmission assembly shall be free from oil leakage during the test.
4.11 Temperature rise performance
The test shall be completed according to the method specified in 5.12. During the test, the oil temperature of the transmission shall not be higher than the designed maximum allowable oil temperature of the transmission, and the temperature-time curve shall be smooth without abrupt change.
Contents of QC/T 568-2019
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Specification
5 Bench test methods
