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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 29082-1992 Specifications of automobile propeller shaft assembly and QC/T 523-1999 Bench test methods of automobile propeller shaft assembly.
In addition to editorial changes, the following main technical changes have been made with respect to QC/T 29082-1992 and QC/T 523-1999:
——The scope of the standard is modified (see Clause 1; QC/T 29082-1992, Clause 1);
——The normative references are modified (see Clause 2; QC/T 29082-1992, Clause 2);
——The terms and definitions are modified, with the term and definition of "maximum speed” deleted, the terms and definitions of static torsional strength safety factor, torsional fatigue life, wear life of universal joint and wear life of sliding spline added, and interpretation in English for definitions added (see Clause 3; QC/T 523-1999, Clause 1);
——The definition name and content as well as the calculation equation of rated torque are modified (see 3.4; QC/T 523-1999, 1.4);
——The provision that “transmission bearings shall meet the requirements of this standard” is modified (see 4.1.1; QC/T 29082-1992, 3.1);
——The provision that “universal joint bearings shall meet those specified in ZB J11014” is modified (see 4.1.2; QC/T 29082-1992, 3.2);
——The serial number of reference standard of U-joint cross assembly is modified (see 4.1.2, QC/T 29082-1992, 3.3);
——The provision that “the parts and components for assembly must pass the inspection” is deleted (see QC/T 29082-1992, 3.4);
——Some of the requirements listed under the provision that "the parts and components shall meet the following requirements before assembly" are deleted (see QC/T 29082-1992, 3.7.1, 3.7.2 and 3.7.3);
——The serial number of reference standard for specification for tightening torque of fasteners is modified (see 4.1.7; QC/T 29082-1992, 3.8);
——The provision for phase position deviation angle of universal joints at both ends of the propeller shaft assembly is modified (see 4.1.10; QC/T 29082-1992, 3.12);
——The requirements for the balance level of residual unbalance as well as the serial numbers of reference standards for the requirements of balance level and the balance error are modified (see 4.1.13; QC/T 29082-1992, 3.14);
——The requirements for the allowable value of the re-balance test results are added (see 4.1.14);
——The serial number of reference standard for paints is modified (see 4.1.15; QC/T 29082-1992, 3.15);
——The requirement for marking is modified (see 4.1.17; QC/T 29082-1992, 3.16);
——-The requirement for filling of lubricating grease is modified (see 4.1.18, QC/T 29082-1992, 3.17);
——The requirement for the inspection of intermediate supporting axle after the assembling of the propeller shaft assembly is added (see 4.1.19);
——The requirement for the included angle of universal joints of the propeller shaft assembly when the complete vehicle is fully loaded is added (see 4.1.20);
——The equation for critical speed is modified, with the individual gear ratios combined into the overall gear ratio (see 4.2.4; QC/T 29082-1992, 3.18);
——The provision that the "the assembling clearance of universal joint, sliding axle and sliding axial cross shall not be greater than the maximum design clearance" is deleted (see QC/T 29082-1992, 3.19);
——The items of impact strength test and related test contents are deleted (see QC/T 29082-1992, 3.21, and QC/T 523-1999, Clause 10);
——The evaluation indexes for torsional fatigue test are modified (see 4.2.7; QC/T 29082-1992, 3.22);
——The evaluation indexes for the wear test of universal joint are modified (see 4.2.8; QC/T 29082-1992, 3.23);
——The evaluation indexes for the wear test of sliding spline are modified (see 4.2.9; QC/T 29082-1992, 3.24);
——The static rigidity test of intermediate support is added (see 4.2.10, 5.2 and 6.10);
——The rotational fatigue test of intermediate support is added (see 4.2.11, 5.2 and 6.11);
——The description of test items is deleted (see QC/T 523-1999, Clause 2);
——The “Quality of propeller shaft assembly” is modified (see 5.1; QC/T 523-1999, 3.1);
——The “Quantity of samples” is modified (see 5.2; QC/T 523-1999, 3.3);
——The requirements for test devices and instruments are deleted (see QC/T 523-1999, 3.2);
——The sub-clause title “Handling of samples after the test” is added, and the requirement for sample treatment are modified (see 5.3; QC/T 523-1999, 3.4);
——The clause "Inspection rules" is deleted (see QC/T 29082-1992, Clause 4);
——The clause “Marking, packaging, transport and storage” is deleted (see QC/T 29082-1992, Clause 5);
——The application scope for the items of critical speed test is modified (see 5.2 and 6.4; QC/T 523-1999, Clause 6);
——The steps for torsion clearance test are modified (see 6.2.2; QC/T 523-1999, 7.2);
——The steps for static torsional rigidity test are modified (see 6.5.2; QC/T 523-1999, 8.2);
——The steps for static torsional strength test are modified, with the limit for loading speed added (see 6.6.2; QC/T 523-1999, 9.2);
——The error in the speed equation for the wear test of universal joint is modified (see Equation (7) in 6.8.2; QC/T 523-1999, 12.2.3);
——The steps for the wear test of universal joint are modified (see 6.8.2; QC/T 523-1999, 12.2);
——The steps for the wear test of sliding spline are modified (see 6.9.2; QC/T 523-1999, 13.2);
——The static rigidity test of intermediate support is added (see 6.10);
——The rotational fatigue test of intermediate support is added (see 6.11);
This standard was proposed by and is under the jurisdiction of SAC/TC 114 National Technical Committee of Auto Standardization.
The previous editions of the standard replaced by this standard are as follows:
——QC/T 29082-1992;
——QC/T 523-1999.
Specifications and bench test methods of automobile propeller shaft assembly
1 Scope
This standard specifies specifications and bench test methods for propeller shaft assembly with cross universal joints (hereinafter referred to as propeller shaft assembly).
This standard is applicable to propeller shaft assemblies of light-, medium- and heavy-duty vehicles and vehicles retrofitted from them, and may be used as a reference for propeller shafts of mini vehicles and vehicles retrofitted from them.
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 of the referenced documents (including any amendment) applies.
GB/T 5671 General purpose lithium lubricating grease for automobile
GB/T 9239.1-2006 Mechanical vibration - Balance quality requirements for rotors in a constant (rigid) state - Part 1: Specification and verification of balance tolerances
GB/T 9239.14 Mechanical vibration - Rotor balancing - Part 14: Procedures for assessing balance errors
JB/T 8925 Rolling bearings - Automobile U-joint cross assembly - Specifications
QC/T 484-1999 Automobiles - Paint coating
QC/T 518 Tightening torque for automotive threaded fasteners
YB/T 5209 Electric-welded steel tubes for cardan shaft
3 Terms and definitions
3.1
propeller shaft assembly
rotating mechanism, consisting of shaft tubes or solid shafts with cross universal joints, or directly connected by two universal joints, which is used to transmit the power of the automobile
3.2
datum plane
mating face for mounting the propeller shaft assembly on the automobile, the position where the shaft and supports are assembled
3.3
standard state
state of propeller shaft assembly, in which the propeller shaft assembly is of the full load length specified in the technical requirements of the product drawings and placed horizontally and the included angle of the universal joint is 0°
3.4
rated torque
torque value specified by the design department of the propeller shaft assembly or the complete vehicle manufacturer based on the configuration of the complete vehicle,
which, depending on the parameter configuration of the complete vehicle, may be calculated based on the maximum torque of the automobile power source or the maximum adhesion, whichever is the smaller
a) If it is calculated based on the maximum torque of the automobile power source:
M=Memaximaxj (1)
where,
M——the rated torque of the propeller shaft assembly, N·m;
Memax——the maximum torque of the automobile power source, N·m;
imax——the maximum overall gear ratio from the automobile power source to the propeller shaft assembly;
j——the torque assign ratio of all transfer cases between the automobile power source and the propeller shaft assembly.
Note: The value of j shall be the product of the torque assign ratios of all transfer cases if there are multiple transfer cases between automobile power source and the propeller shaft assembly, and it shall be 1 if there isn’t any transfer case. For tandem axle, the value of j shall be 0.5.
b) If it is calculated based on the maximum adhesion force:
M=mgrkϕ/i0 (2)
where,
m——the full load of front drive axle, kg;
g——the gravitational acceleration, which may be taken as 9.81, m/s2;
rk——the rolling radius of wheel, m;
ϕ——the road adhesion coefficient (which may be taken as 0.8 in case of good asphalt pavement);
i0——the gear ratio of the drive axle assembly.
3.5
static torsional strength safety factor
ratio of the static torsional yield torque to the rated torque in the static torsional strength test of the propeller shaft assembly
(3)
where,
ns——the static torsional strength safety factor;
Ms——the static torsional yield torque of the propeller shaft assembly, N·m;
M——the rated torque of the propeller shaft assembly, N·m.
3.6
torsional fatigue life
number of cycles at which a certain part of the propeller shaft assembly is damaged when the propeller shaft assembly is subjected to alternating torque
3.7
wear life of universal joint
number of cycles at which the universal joint is worn and failed when a torque with a value of 65% of the rated torque is applied to the propeller shaft assembly at the specified installation angle
3.8
wear life of sliding spline
number of reciprocating motions at which the sliding spline surface is worn and failed when the propeller shaft assembly, with the expansion amount of the spline no less than 10 mm, is operated continuously under a torque with a value of 20% of the rated torque
4 Technical requirements
4.1 General technical requirements
4.1.1 The propeller shaft assembly shall be manufactured in accordance with drawings and technical documents approved via established procedures.
4.1.2 The U-joint cross assembly shall meet the relevant requirements of JB/T 8925.
4.1.3 As for the electric-welded steel tubes for propeller shaft assembly, the relevant requirements of YB/T 5209 shall be referred to.
4.1.4 All parts shall be cleaned and washed before assembly.
4.1.5 The surface of the propeller shaft assembly and the finished surface of the parts shall be free from burrs, bruises, rust, creases, distortion, cracks and other defects.
4.1.6 The welded parts of the shaft tube of the propeller shaft assembly shall be welded reliably, and the welds, apart from having a size meeting the requirements of the drawing, shall be smooth and uninterrupted, without defects such as false welding and slag inclusion.
4.1.7 During assembly, no missing or wrong assembly shall be allowed. The connecting fasteners shall be firm and reliable, and the tightening torque shall meet the requirements of QC/T 518.
4.1.8 For universal joints of plate type, the protruding part of the back plate shall be embedded in the groove on the outer end face of the bearing cup, and the fastening bolt on the pressing plate shall be locked with fixing locking piece; for universal joints of snap ring type, the snap ring shall be fully embedded in the ear hole groove or in the outer circular groove of the bearing cup.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
5 Sample requirements
6 Test methods
Annex A (Informative) Curves of maximum permissible specific unbalance corresponding to each balance quality grade
Annex B (Informative) Calculation example of correcting permissible amount of unbalance of propeller shaft assembly
