QC/T 1020-2023Drive shaft assembly for automobiles (English PDF)

3.20 of the 2015 edition);

d) ADD a chapter on "Symbols" (see Chapter 4);

e) ADD a chapter on "Technical requirements" (see Chapter 5);

f) ADD the test methods such as "fixed pitch bending angle", "static plunging

resistance", "generated axial force", "high-frequency plunging resistance", "drive

efficiency", "torsional stiffness", "boot rotation expansion", "boot tightness" (see

6.1, 6.7, 6.8, 6.9, 6.10, 6.12, 6.16, 6.17);

g) CHANGE the "displacement and bending angle" to "moving pitch displacement

and bending angle" (see 5.2, 6.2; 4.5 of the 2015 edition);

h) CHANGE the "torsional fatigue" to "torsional fatigue strength", deleting the

requirement in the test method to statistically analyze the test results according to

the Weibull distribution (see 5.14, 6.14; 4.3 of the 2015 edition);

i) CHANGE the "life" to "durable life", changing the multi-road segment test

procedure (see 5.15, 6.15; 4.4 of the 2015 edition);

Drive shaft assembly for automobiles

5.1 Fixed pitch bending angle

The fixed pitch bending angle shall meet the product technical requirements.

5.2 Moving pitch displacement and bending angle

The moving pitch displacement and bending angle shall meet the product technical

requirements.

5.3 Rotational backlash

The rotational backlash of the drive shaft assembly shall not be greater than 60'.

5.4 Axial clearance

The axial clearance of the fixing joint shall not be greater than 0.6 mm.

5.5 Swing torque

The swing torque of the fixing joint with a boot shall not be greater than 20 N·m; the

swing torque of the fixing joint without a boot shall not be greater than 8 N·m.

5.6 Rotational torque

The rotational torque of the fixing joint with a boot shall not be greater than 10 N·m;

the rotational torque of the fixing joint without a boot shall not be greater than 5 N·m.

5.7 Static plunging resistance

The static plunging resistance shall meet the technical requirements of the product.

5.8 Generated axial force

The generated axial force shall meet the technical requirements of the product.

5.9 High-frequency plunging resistance

The high-frequency plunging resistance shall meet the technical requirements of the

product.

5.10 Drive efficiency

The drive efficiency of the drive shaft assembly shall not be less than 98%.

5.11 Static torsional strength

The Johnson's apparent elastic limit of the drive shaft assembly shall not be less than

the rated torque; the breaking torque shall not be less than 1.35 times the rated torque.

5.12 Torsional stiffness

The torsional stiffness shall meet the product technical requirements.

5.13 Quasi-static torsional strength

The quasi-static torsional strength shall meet the product technical requirements.

5.14 Torsional fatigue strength

The torsional fatigue strength shall meet the product technical requirements.

5.15 Endurance life

The endurance life grade shall not be less than grade 3 or shall meet the product

technical requirements.

5.16 Boot rotation expansion

The boot rotation expansion shall not be greater than 7 mm.

5.17 Boot tightness

The air pressure in the boot has no continuous downward trend; no bubbles are visually

observed at the boot and the joints.

6.1 Fixing joint bending angle

6.1.1 Test equipment

6.1.1.1 The test equipment shall be able to bend and rotate the test piece.

6.1.1.2 The test equipment shall be able to measure and record the bending torque and

bending angle in real time.

6.1.2 Test method

6.1.2.1 Install the drive shaft assembly (hereinafter referred to as the "test piece") to the

test equipment as shown in Figure 1.The initial bending angle of the universal joint is

0°. The test piece shall not generate additional force in the initial state.

6.1.2.2 Start the test equipment; rotate the test piece at a fixed speed at (30 ~ 120) r/min

in the actual forward direction of the vehicle; make the fixing joint swing from 0° until

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