QC/T 529-2013 English PDF (QCT529-2013)

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QC/T 529-2013: Motor vehicles. Hydraulic power steering gear. Technique requirements and test methods
QC/T 529-2013
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.50
T 23
Replacing QC/T 529-2000, QC/T 530-2000
Motor vehicles - Hydraulic power steering gear - Technique
requirements and test methods
ISSUED ON: APRIL 25, 2013
IMPLEMENTED ON: SEPTEMBER 01, 2013
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 7
1 Scope ... 8
2 Normative references ... 8
3 Terms and definitions ... 8
4 General ... 10
5 Test samples ... 10
6 Recirculating ball power steering gear ... 11
7 Rack and pinion power steering gear ... 15
8 Inspection rules ... 21
Motor vehicles - Hydraulic power steering gear - Technique
requirements and test methods
1 Scope
This standard specifies the technical conditions and test methods, for the constant flow
hydraulic power steering gear of automobiles.
This standard applies to constant flow hydraulic power steering gear of automobiles.
This standard does not apply to full hydraulic steering gear.
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 5179 Motor vehicle - Steering system - Terms and definitions
QC/T 305 Specifications for power steering control valve assembly of automobile
QC/T 306 Bench test method for automobile power steering control valve assembly
3 Terms and definitions
The terms and definitions, as defined in GB/T 5179, as well as the following terms and
definitions, apply to this standard.
3.1
Center location
The 1/2 position of the total number of turns of the hydraulic power steering gear
assembly (hereinafter referred to as the assembly).
3.2
Circle
e) The tightening torque of the internal and external screws, during disassembly and
inspection, is less than 0.7 times the minimum tightening torque, which is
specified for the product;
f) Deformation or cracks in any parts.
4 General
4.1 Installation and arrangement of the tested assembly bench.
4.1.1 When testing the assembly, refer to the layout of the original car OR install it
straight on the test bench. The oil tank is allowed to use the test bench oil tank. The
absolute filtration accuracy of the oil filter shall not be lower than that of the original
car. It is allowed to use the device, which is equipped on the test bench, to replace other
device.
4.1.2 The oil used in the test shall meet the requirements of the product instruction
manual. The oil temperature for performance test is (50 ± 5) °C; the oil temperature for
reliability test is (80 ± 5) °C. The test flow rate shall be the rated flow Qn, which is
specified in the product manual or design.
4.2 Test errors of test instruments and meters
a) Pressure: The error of the pressure test system shall not be greater than 0.5%.
b) Flow: The error of the flow test system shall not be greater than 0.5%;
c) Rotation angle: The error of the rotation angle test system shall not be greater than
0.5%;
d) Displacement: The error of the displacement test system shall not be greater than
0.5%;
e) Torque: The error of the torque test system shall not be greater than 0.5%;
f) Force: The error of the force test system shall not be greater than 0.5%.
5 Test samples
The test samples shall be manufactured, in accordance with the drawings and technical
documents, which are approved by the prescribed procedures. Their materials,
dimensions, heat treatment and assembly conditions shall comply with the provisions
of the drawings and technical documents.
6 Recirculating ball power steering gear
6.1 Performance requirements
6.1.1 The total number of turns of the steering gear and the rotation angle of the rocker
shaft.
The total number of turns of the steering gear and the rotation angle of the rocker shaft
shall meet the design requirements.
6.1.2 No-load torque.
The variation range of the average value of left steering and right steering torque shall
meet the design requirements. The variation range, from the maximum value to the
minimum value, shall meet the design requirements. The variation range of adjacent
peaks and troughs in the curve shall meet the design requirements.
6.1.3 Free clearance.
The free clearance is not more than 5°.
6.1.4 Functional test.
In the process of turning the input end, it feels smooth and no jamming, AND the
steering control valve can automatically return.
6.1.5 Steering force characteristics.
The steering torque and characteristic curve, at the highest working pressure, shall meet
the design requirements; the symmetry of the curve shall not be less than 85%.
6.1.6 Return ability.
The return time is not more than 5 s.
6.1.7 Internal leakage.
The internal leakage volume meets the design requirements; after the reliability test, it
does not exceed 150% of the design value of the leakage volume before the test.
6.1.8 External leakage.
No external leakage is allowed in any part of the assembly.
6.2 Reliability requirements
6.2.1 Reverse fatigue test.
Install the assembly on the test bench. The test oil pressure is the highest working
pressure. The steering rocker arm reaches the maximum output torque, during the test.
The input end runs at a speed of (20 ~ 30) r/min. The angle of the input end is not less
than 90% of the total turning angle. After 25000 cycles are completed, continue the test
according to 6.3.3, 6.3.4, 6.3.5, 6.3.7, after this test.
6.4.3 Forced steering test.
This test is not applicable to the semi-integrated hydraulic power steering gear. Install
the assembly on the test bench. The oil pump does not work during the test. Rotate the
input end, to adjust the output load, so that the torque at the input end is 125 N·m
(assembly which has an output torque not greater than 2500 N·m) or 175 N·m
(assembly which has an output torque greater than 2500 N·m). After completing 10
cycles, continue the test according to 6.3.4, after this test.
6.4.4 Reverse overload test.
Install the assembly on the test bench. Under the powered conditions, fix the input end
rigidly in the center location. At the connection between the steering rocker arm and the
straight rod, quickly apply the load in the direction of 90° to the centerline of the
steering rocker arm, until the load is equal to 3 times the maximum output force of the
assembly, stop the test. Finish the test in two directions, respectively. After this test,
continue to carry out the test according to 6.3.4.
6.4.5 Overpressure test.
Install the assembly on the test bench. Install a stopper, at the maximum swing angle of
the steering rocker arm. Rotate the input end, so that the pressure at the oil inlet of the
assembly is 2.5 times (for assemblies which have an output torque greater than 2500
N·m) and 2.0 times (for assemblies which have an output torque not more than 2500
N·m) the highest working pressure. Finish the test in two directions, respectively.
7 Rack and pinion power steering gear
7.1 Performance requirements
7.1.1 The total number of turns of the steering gear and the movement of the rack.
The total number of turns of the steering gear and the movement of the rack shall meet
the design requirements.
7.1.2 No-load torque.
Same as 6.1.2.
7.1.3 F...