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QC/T 568-2019: The specification and bench test methods for manual transmission (MT) assembly
QC/T 568-2019
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.50
T 21
Replacing QC/T 29063.1-2011, QC/T 568.1-2011
The specification and bench test methods for manual
transmission (MT) assembly
ISSUED ON: NOVEMBER 11, 2019
IMPLEMENTED ON: APRIL 01, 2020
Issued by: Ministry of Industry and Information Technology of PRC
Annex:
39 automotive industry standard numbers, standard names
and implementation dates
No. Standard number Standard name
Replaced standard
number
Date of
implementation
33 QC/T 826-2019 Bridge inspection vehicle QC/T 826-2010 2020-04-01
34 QC/T 1107-2019 Compression garbage truck 2020-04-01
35 QC/T 53-2019 Fecal suction truck QC/T 53-2006 2020-04-01
36 QC/T 1108-2019 Pneumatic solenoid valve for commercial vehicles 2020-04-01
37 QC/T 708-2019 Automotive air conditioning fan
QC/T 708-2004
QC/T 29092-1992
2020-04-01
38 QC/T 1109-2019 Dimming motor for automotive front lighting 2020-04-01
39 QC/T 829-2019
Technical requirements for diesel vehicle exhaust
aftertreatment system
QC/T 829-2010 2020-04-01
40 QC/T 1110-2019 Fuel heating device for automobile diesel engine 2020-04-01
41 QC/T 1113-2019
Technical requirements and test methods for quick-
plug connectors for automobile pneumatic brake
systems
2020-04-01
42 QC/T 29082-2019
Technical conditions of automobile drive shaft
assembly and bench test method
QC/T 29082-1992
QC/T 523-1999
2020-04-01
43 QC/T 1114-2019
Technical conditions and bench test methods for
automobile’s mechanical automatic transmission (AMT)
assembly
2020-04-01
44 QC/T 568-2019
Technical conditions and bench test methods of
automobile mechanical transmission assembly
QC/T 568.1-2011
QC/T 29063.1-2011
2020-04-01
45 QC/T 1115-2019
Technical requirements and test methods of automatic
transmission (AT)
2020-04-01
46 QC/T 216-2019 Car carpet QC/T 216-1996 2020-04-01
47 QC/T 1116-2019 Dust suppression vehicle 2020-04-01
48 QC/T 1117-2019 Animal and poultry harmless transport vehicles 2020-04-01
49 QC/T 453-2019 Van transport truck QC/T 453-2002 2020-04-01
50 QC/T 447-2019 Construction slab transport truck QC/T 447-1999 2020-04-01
51 QC/T 1118-2019 Technical requirements for van exchange box 2020-04-01
52 QC/T 1121-2019 Plastic fuel tanks for automobiles 2020-04-01
53 QC/T 1122-2019
Technical requirements of electric water pump for
automobile engine
2020-04-01
54 QC/T 626-2019 Automotive window regulator
QC/T 626-2008
QC/T 636-2014
2020-04-01
Table of Contents
Foreword ... 7 
1 Scope ... 9 
2 Normative references ... 9 
3 Terms and definitions ... 10 
4 Technical conditions ... 10 
5 Bench test method ... 13 
The specification and bench test methods for manual
transmission (MT) assembly
1 Scope
This standard specifies the technical conditions of for manual transmission (MT)
assembly and the corresponding bench test methods of automobile.
This standard is applicable to categories M and N automotive manual
transmission (MT) assembly (hereinafter referred to as transmissions).
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) is applicable to this standard.
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 method for mercury in automobile materials
QC/T 942 Test method for hexavalent chromium in automobile materials
QC/T 943 Test method for lead and cadmium in automobile materials
QC/T 944 Test method for poly-brominated biphenyls (PBBs) and poly-
brominated diphenyl ethers (PBDEs) in automobile materials
The assembly shall be free of rust. If necessary, the exposed surface of the
assembly shall be subject to anti-rust treatment. The anti-rust grade shall meet
the requirements of GB/T 6461.
4.3 Cleanliness
The cleanliness of the non-disassembled transmission assembly shall be
calculated according to formula (1):
Where:
G - The actual measured impurity mass of the transmission assembly,
K - Objective evaluation coefficient of cleanliness, i.e., impurity content per
liter of lubricating oil, mg/L; the allowable K value is as shown in Table 1;
Le - The rated volume of lubricating oil for transmission assembly, L.
Table 1 -- Allowable K value
Automobile type Allowable K value
Category M1 50
Category M2, category M3,
category N
Without additional transmission 50
With additional transmission 60
4.4 Fatigue life
Complete the test according to the method specified in 5.5. During the test,
there shall be no abnormal noise, oil leakage, etc., meanwhile the main parts
and components shall not be damaged, such as fracture, pitting, peeling,
jamming, etc. (for tooth surface pitting, passenger vehicle: single tooth surface's
accumulative pitting area is more than 4 mm2 or the depth exceeds 0.5 mm;
commercial vehicles: A single pitting area exceeds 4 mm2, or a single tooth
surface's accumulative pitting area exceeds 20% of a single tooth surface).
4.5 Shift life
For the transmission with synchronizer, the test shall be completed according
to the method as specified in 5.6; any gear shall not show continuous gearing
failure or 5 consecutive gear shifting shocks or gear knocking.
4.6 Static torsion strength
The test is completed according to the method specified in 5.7; the static torsion
strength's reserve factor shall meet the following requirements: the forward gear
K of passenger cars is greater than or equal to 2.5; the reverse gear K is greater
than or equal to 2.0; the K value of commercial vehicles is greater than or equal
5.1.1 Test sample
5.1.1.1 In one of the following situations, the bench test shall be carried out
according to 5.2 ~ 5.14:
a) When developing new products;
b) After the new product is finalized, there are major changes in structure,
material, process, etc. that may affect product performance.
5.1.1.2 Sampling shall be carried out according to the following requirements:
a) The mass production test samples shall be taken from the qualified
products after exit-factory inspection according to GB/T 2828.1;
b) In the new product development stage, the test sample is a trial prototype;
c) Customer sampling or entrusted party sending samples.
5.1.1.3 At least 2 test samples are taken for each test item; if all test samples
are qualified, the item is judged to be qualified.
5.1.1.4 Before the test, test and record the test samples according to the
requirements of the test items.
5.1.1.5 One transmission can be subjected to multiple tests without affecting
subsequent tests.
5.1.2 Run-in before test
5.1.2.1 Before the fatigue life test, transmission efficiency test, noise test, high-
speed test, the test samples shall be run-in. According to the input shaft speed,
input torque, run-in time specified in Table 6 to run-in the gears at each gear
position, at an oil temperature of less than or equal to 80 °C.
Table 6 -- Run-in parameters such as fatigue life test
Automobile type Input torque/ (N • m) Input speed/ (r/min) Run-in time/h
Category M1
First gear: 40%Tmax
Other forward gear: 50%Tmax
Reverse gear: 35%Tmax
Forward gear: The maximum speed
at the maximum torque point of
engine
Reverse gear: 50% of the maximum
speed at the maximum torque point
of engine
Forward gear: 1.0
Reverse gear: 0.5
Category M2,
category M3,
category N
First gear: 40%Tmax
Other forward gear: 50%Tmax
Reverse gear: 35%Tmax (If
the transmission ratio of the
1450
Forward gear: 1.0
Reverse gear: 0.5
The fatigue life test shall use the following equipment:
a) Driving device;
b) Loading device;
c) Test tooling;
d) Speed, torque, temperature measuring instrument and timer;
e) Safety device.
5.5.2 Test procedure
5.5.2.1 Install the transmission on the test bench and fill in lubricating oil as
required.
5.5.2.2 Perform run-in according to 5.1.2.1. Change the oil after run-in (category
M2, M3 and N may not change oil).
5.5.2.3 The test oil temperature is 80 °C ± 5 °C.
5.5.2.4 The input speed is the maximum speed at the engine's maximum torque
point ± 10 r/min. When the engine speed at the maximum torque is close to or
less than 1450 r/min, it may take 1450 r/min.
5.5.2.5 The number of tests for each gear position of the transmission shall be
carried out according to the requirements in Table 8.
5.5.2.6 The test is carried out in sequence from low gear to high gear and
reverse gear. The whole test can be divided into 10 cycles.
The static torsion strength test shall have the following equipment and
conditions:
a) Driving device;
b) Test tooling;
c) Torque sensor, measurement accuracy is ± 1% FS;
d) Angle sensor, measuring accuracy is ± 0.5°;
e) Measurement data recorder.
5.7.2 Test procedure
5.7.2.1 Install the transmission on the test bench.
5.7.2.2 The input shaft and output shaft only bear torque; no additional bending
moment is allowed.
5.7.2.3 During the test, the gear tooth's loaded working surface is the same as
the vehicle driving condition.
5.7.2.4 The output shaft is fixed; the torsion speed of the input shaft does not
exceed 0.2 r/min.
5.7.2.5 Reliably hook the transmission into the lowest gear which has a speed
ratio of less than 10; load at a constant speed at startup until damage occurs or
the torque reaches the specified value; record the torque and rotation angle of
the input shaft when it is damaged, or the angle of input shaft when the specified
torque is reached.
5.7.3 Processing of test results
Calculate the static torsion strength's reverse factor K by formula (2):
Where:
T - Torque recorded at the end of test, N • m;
Tmax - Rated input torque of the transmission, N • m.
If the static torsion strength's reverse factor meets the requirements of 4.6, the
test is determined to be qualified.
5.8.3.2 The comprehensive transmission efficiency is the average measured
efficiency of each forward gear (not including the first gear).
5.8.3.3 If the requirements of 4.7 are met, the test is determined to be qualified.
5.9 Noise test
5.9.1 Test conditions
5.9.1.1 Test field
It is carried out in a semi-anechoic chamber, no obstacles shall be placed within
2 m of the measurement field; the distance between the test bench and the wall
is 2 m.
5.9.1.2 Test equipment
The noise test shall include the following equipment:
a) Driving device;
b) Power suction device;
c) Test tooling;
d) Speed, torque, temperature measuring instrument;
e) Acoustic data acquisition and processing system;
f) Safety device.
5.9.2 Test procedure
5.9.2.1 Install the transmission on the test bench and fill in lubricating oil as
required. Install 3 microphones (such as microphones) on the left, right and
above the transmission; meanwhile the distance between the 3 microphones
and the transmission surface is 1000 mm ± 10 mm. The mounting surface
formed by the 3 microphones shall be perpendicular to the input shaft's center
line of the transmission and is at half the length of the transmission; the two
microphones on the left and right shall be the same height as the transmission
input shaft. The schematic diagram of microphone installation is as shown in
Figure 1.
5.9.3.3 If the requirements of 4.8 are met, the test is determined to be qualified.
5.10 Gear-shift performance test
5.10.1 Dynamic gear-shift performance test
5.10.1.1 Test conditions
The dynamic gear-shift performance test shall include the following equipment
and conditions:
a) A drive device that can drive the output shaft of the transmission;
b) Clutch driven disc or inertia disc of simulated clutch driven disc;
c) Test tooling;
d) Force sensor;
e) Timer to record the number of reciprocating shifts;
f) Transmission oil temperature gauge;
g) Tachometer;
h) Shift actuator;
i) Safety device;
j) The fluctuation of the transmission output shaft speed during gear shifting
shall be less than or equal to 5% of the set speed.
5.10.1.2 Test procedure
5.10.1.2.1 Install the transmission on the test bench and fill in lubricating oil as
required.
5.10.1.2.2 Run-in according to 5.1.2.2. Change the oil after run-in (category M2,
M3 and N may not change oil).
5.10.1.2.3 Drive the transmission from the output end of the transmission.
Alternately make at least 20 gear shifts between two adjacent gears. For
category M1: It is 50% of the engine's maximum speed for upshift; it is 32% of
the engine's maximum speed for downshift. For category M2, M3, N: It is 65% ~
70% of the engine's maximum speed for both upshift and downshift.
5.10.1.2.4 The shifting force is set to the designed value.
5.10.1.2.5 The temperature of the lubricating oil in the test can be within the
appropriate range and install it on the gear selection rocker arm of the
transmission; make the force measurement direction be consistent with the
direction of the gear selection force. When the input shaft and output shaft of
the transmission are in stationary state, push the gear selection rocker arm at
a constant speed to select gears; perform 3 tests in the sequence of neutral...