QC/T 29096-2014 English PDF (QCT29096-2014)

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QC/T 29096-2014: The bench test methods of automobile steering gear
QC/T 29096-2014
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.50
T 23
Replacing QC/T 29096-1992
The bench test methods of automobile steering gear
ISSUED ON: MAY 06, 2014
IMPLEMENTED ON: OCTOBER 01, 2014
Issued by: Ministry of Industry and Information Technology of the
People's Republic of China
Table of Contents
Foreword ... 7 
1 Scope ... 9 
2 Normative references ... 9 
3 Terms and definitions ... 9 
4 General requirements ... 9 
5 Test methods ... 10 
Appendix:
Number, name, and date of implementation of 32 automotive industry
standards
No. Standard number Standard name
Number of
standard replaced
Date of
implementation
1 QC/T 231-2014 Specification of kick-starter for motorcycles and mopeds QC/T 231-1997
October 01,
2014
2 QC/T 233-2014
Performance and measurement
method for static intensity of
motorcycles and mopeds
QC/T 233-1997 October 01, 2014
3 QC/T 66-2014 Wet clutch for moped and motorcycles QC/T 66-1993
October 01,
2014
4 QC/T 962-2014 Technical specifications for coating of motorcycles and moped
October 01,
2014
5 QC/T 680-2014
General technical specifications for
voltage regulators for motorcycles and
moped
QC/T 680-2002 October 01, 2014
6 QC/T 963-2014 Drum brakes of motorcycles and mopeds wheels
October 01,
2014
7 QC/T 234-2014
General technical specifications for
steering shaft for motorcycles and
moped
QC/T 234-1997 October 01, 2014
8 QC/T 964-2014 The strength of plastic seats and their anchorages for city buses
October 01,
2014
9 QC/T 644-2014 Technical specifications for automotive metallic fuel tank
QC/T 644-2000
QC/T 488-2000
October 01,
2014
10 QC/T 965-2014 Driver of electric rear-view mirrors for motor vehicles
October 01,
2014
11 QC/T 966-2014 Technical specifications for automotive plastic parts coatings
October 01,
2014
12 QC/T 459-2014 Truck with loading crane QC/T 459-2004 October 01, 2014
13 QC/T 29106-2014
Technical specification of automobile
wire harness QC/T 29106-2004
October 01,
2014
14 QC/T 198-2014 General technical specification for automotive switch QC/T 198-1995
October 01,
2014
15 QC/T 220-2014 Technical specifications for automotive fusible links QC/T 220-1996
October 01,
2014
16 QC/T 967-2014 Port fuel injector for gasoline engine October 01, 2014
17 QC/T 968-2014
Determination methods of platinum,
palladium and rhodium contents in
metallic catalytic converters
October 01, 2014
18 QC/T 969-2014 Interior truck release for compartment of a passenger car
October 01,
2014
19 QC/T 636-2014 Electric window regulator specification for vehicles QC/T 636-2000
October 01,
2014
20 QC/T 970 2014 Passenger car air filter technical specification
October 01,
2014
The bench test methods of automobile steering gear
1 Scope
This Standard specifies the bench test methods of recirculating-ball automobile
steering gear and pinion-and-rack automobile steering gear.
This Standard applies to recirculating-ball and pinion-and-rack automobile
steering gear.
2 Normative references
The following documents are indispensable for the application of this Standard.
For the dated references, only the editions with the dates indicated are
applicable to this Standard. For the undated references, the latest edition
(including all the amendments) are applicable to this Standard.
GB/T 5179 Motor vehicle - Steering system - Terms and definitions
QC/T 29097 The technical specifications of automobile steering gear
3 Terms and definitions
The terms and definitions defined in GB/T 5179 and QC/T 29097 apply to this
Standard.
4 General requirements
4.1 Test type
The test items of this Standard, from the main categories, are divided into the
following three types:
- Performance test;
- Strength test;
- Durability test.
4.2 Accuracy of test instruments
The accuracy of the test instruments used in each test item must meet the
following corresponding requirements:
- Accuracy requirement of angle sensor: 0.1°;
- Accuracy of displacement sensor: 0.01 mm;
- Accuracy of torque sensor: 1%;
- Accuracy of force sensor: 1%.
5 Test methods
5.1 Performance
5.1.1 Full rotation angle of input shaft.
FIX the steering gear. There shall be no gap between the sensor and the input
shaft. ROTATE the input shaft from one limit position to another limit position;
MEASURE the total rotation angle.
5.1.2 Rack travel.
FIX the steering gear. There shall be no gap between the sensor and the rack.
Install pull rods or substitutes on both ends of the rack; MEASURE the distance
that the rack moves from one end to the other.
5.1.3 Transmission ratio.
5.1.3.1 Angular transmission ratio of recirculating-ball steering gear.
FIX the steering gear. Install the angle sensor close to the input shaft and the
rocker arm shaft; the connection is required to be gap-free, see Figure 1.
ROTATE the input shaft from one-end limit position to the other-end limit
position; DRIVE the input shaft at a speed of 10r/min ~ 15 r/min; MEASURE
the instantaneous angle values of the input shaft and the rocker arm shaft.
and reverse torque of the input shaft in the whole process. The input shaft
speed is 15r/min.
REMOVE about 30° at both ends of the relationship curve, obtained by the test,
between the rotation angle and the torque. Calculate the average torque of ±
180° in the middle and the average torque of the remaining rotation angles on
both sides.
5.1.5 Rack moving force.
FIX the steering gear housing. Connect the force sensor and displacement
sensor to the rack. The connection is required to be free of gaps. PUSH (PULL)
the rack; MEASURE the moving force of the rack. The rack moving speed is
0.5m/min.
REMOVE the 3mm data at both ends of the displacement and force relationship
curve obtained by the test; DRAW the displacement and force relationship
curve.
5.1.6 Transmission clearance.
5.1.6.1 Transmission clearance of recirculating-ball steering gear.
Method 1: FIX the rocker arm shaft and the housing; LOAD a torque of ± 2N •
m on the input shaft end; MEASURE the difference of the input shaft rotation
angle, which is the clearance of this point (used for exit-factory test).
Method 2: Connect angle sensors to the input shaft and rocker arm shaft,
respectively. The connection is required to be free of gaps. ADD a load of 10N
• m to the rocker arm shaft; at a speed of 10r/min ~ 15r/min, drive the input shaft
forward. MEASURE the instantaneous corresponding angle values of the input
shaft and the rocker arm shaft. Then at the same speed, reversely drive the
input shaft, to measure the same data (see Figure 3).
1 - Torque sensor; 2, 3 - Angle sensor; A - Fixed or add ± 10N • m torque
Figure 3 -- Schematic diagram of test of recirculating-ball transmission
clearance
M1, M2 - Input and output torque of rocker arm shaft, N • m;
W1, W2 - Input and output torque of input shaft, N • m.
5.1.7.2 Transmission efficiency of pinion-and-rack steering gear.
FIX the steering gear. Connect the torque sensor and angle sensor to the input
shaft. Connect the force sensor and displacement sensor to the rack. The
connection is required to be free of gaps. At a speed of 15r/min, drive the input
shaft; MEASURE the torque and rotation angle, ...