Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
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 788-2007 Performance requirements and bench test methods of automobile pedal device. The following main technical changes have been made with respect to QC/T 788-2007:
——accelerator pedal device is canceled in the applicable scope of this standard (see Clause 1; Clause 1 of Edition 2007);
——schematic diagram for longitudinal displacement is modified (see Figure 1; Figure 1 of Edition 2007);
——schematic diagram for lateral displacement is modified (see Figure 2; Figure 1 of Edition 2007);
——schematic diagram for stiffness deformation is added (see Figure 3);
——vibration durability is added (see 4.6 and 6.5.3);
——pre-action requirements for the samples before test are added (see 5.2.1);
——description of test environmental temperature range is added (see 5.2.2);
——description of test sample quantity is modified (see 5.3; 5.3 of Edition 2007);
——schematic diagram for longitudinal displacement test is added and the test conditions for longitudinal displacement are modified (see Figure 4 and 6.1.1.3; 4.2.1 and 5.2.1.1 of Edition 2007);
——schematic diagram for lateral displacement test is added and the test conditions for lateral displacement are modified (see Figure 5 and 6.1.2.2; 4.2.2 and 5.2.1.2 of Edition 2007);
——"high-temperature workability” is modified to "high-temperature adaptability” and environmental temperature of the test is modified, and retest of performance after the test is added (see 6.2.1; 5.2.2.1 of Edition 2007);
——"low-temperature workability" is modified to "low-temperature adaptability" and retest of performance after test is added (see 6.2.2; 5.2.2.2 of Edition 2007);
——test conditions for strength are modified (see 6.4; 5.2.4 of Edition 2007);
——test time of corrosion resistance is modified (see 6.6; 5.2.6 of Edition 2007);
This standard was proposed by and is under the jurisdiction of National Technical Committee of Auto Standardization (SAC/TC 114).
The previous edition of this standard is as follows:
——QC/T 788-2007.
Performance requirements and bench test methods of motor vehicle pedal device
1 Scope
1.1 This standard specifies the terms and definitions, performance requirements, test-related requirements and test methods of brake pedals and clutch pedals for motor vehicles.
1.2 This standard is applicable to mechanical articulated metal brake pedals and clutch pedals for motor vehicles; it also serves as a reference for other types of pedal devices.
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 document (including any amendments) applies.
GB/T 5620 Road vehicles - Braking of automotive vehicles and their trailers - Vocabulary
GB/T 10125-2012 Corrosion tests in artificial atmospheres - Salt spray tests
3 Terms and definitions
For the purposes of this standard, the terms and definitions specified in GB/T 5620 and the following apply.
3.1
pedal device
control mechanism manipulate by the driver with foot
3.2
longitudinal displacement, LP1
vertical displacement of the pedal under the longitudinal force P1 vertical to the pedal surface and passing through the geometric center point of the pedal in the positive and negative directions, see Figure 1
Figure 1 Schematic diagram for longitudinal displacement
3.3
lateral displacement, LT
horizontal displacement of the pedal under the lateral force T parallel to the pedal surface and passing through the geometric center point of the pedal in the positive and negative directions, see Figure 2
Figure 2 Schematic diagram for lateral displacement
3.4
stiffness
vertical displacement of the pedal under the longitudinal force P2 vertical to the pedal surface and passing through the geometric center point of the pedal, see Figure 3
Figure 3 Schematic diagram for stiffness deformation
4 Performance requirements
4.1 Basic performance
4.1.1 Longitudinal displacement
The measured longitudinal displacement of pedal device shall not be greater than 2.0mm.
4.1.2 Lateral displacement
The measured lateral displacement of pedal device shall not be greater than 4.0mm.
4.1.3 Stiffness
The measured longitudinal displacement of pedal device shall not be greater than 5.0mm.
4.2 Temperature adaptability
4.2.1 High-temperature adaptability
During the test, the pedal device shall be free from interference, jamming and abnormal noise. After the test, the measured longitudinal displacement and lateral displacement of pedal device shall meet the requirements of 4.1.1 and 4.1.2 respectively.
4.2.2 Low-temperature adaptability
During the test, the pedal device shall be free from interference, jamming and abnormal noise. After the test, the measured longitudinal displacement and lateral displacement of pedal device shall meet the requirements of 4.1.1 and 4.1.2 respectively.
4.3 Torsion resistance
Pedals and welds shall be free from crack or damage.
4.4 Strength
For the pedal device, its permanent deformation shall not be greater than 5.0mm, and it shall be free from crack or damage.
4.5 Working durability
4.5.1 During the working durability test, the pedal device shall be free from deformation affecting its function, and be free from cracks or other abnormality.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Performance requirements
5 Test-related requirements
6 Test methods
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
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 788-2007 Performance requirements and bench test methods of automobile pedal device. The following main technical changes have been made with respect to QC/T 788-2007:
——accelerator pedal device is canceled in the applicable scope of this standard (see Clause 1; Clause 1 of Edition 2007);
——schematic diagram for longitudinal displacement is modified (see Figure 1; Figure 1 of Edition 2007);
——schematic diagram for lateral displacement is modified (see Figure 2; Figure 1 of Edition 2007);
——schematic diagram for stiffness deformation is added (see Figure 3);
——vibration durability is added (see 4.6 and 6.5.3);
——pre-action requirements for the samples before test are added (see 5.2.1);
——description of test environmental temperature range is added (see 5.2.2);
——description of test sample quantity is modified (see 5.3; 5.3 of Edition 2007);
——schematic diagram for longitudinal displacement test is added and the test conditions for longitudinal displacement are modified (see Figure 4 and 6.1.1.3; 4.2.1 and 5.2.1.1 of Edition 2007);
——schematic diagram for lateral displacement test is added and the test conditions for lateral displacement are modified (see Figure 5 and 6.1.2.2; 4.2.2 and 5.2.1.2 of Edition 2007);
——"high-temperature workability” is modified to "high-temperature adaptability” and environmental temperature of the test is modified, and retest of performance after the test is added (see 6.2.1; 5.2.2.1 of Edition 2007);
——"low-temperature workability" is modified to "low-temperature adaptability" and retest of performance after test is added (see 6.2.2; 5.2.2.2 of Edition 2007);
——test conditions for strength are modified (see 6.4; 5.2.4 of Edition 2007);
——test time of corrosion resistance is modified (see 6.6; 5.2.6 of Edition 2007);
This standard was proposed by and is under the jurisdiction of National Technical Committee of Auto Standardization (SAC/TC 114).
The previous edition of this standard is as follows:
——QC/T 788-2007.
Performance requirements and bench test methods of motor vehicle pedal device
1 Scope
1.1 This standard specifies the terms and definitions, performance requirements, test-related requirements and test methods of brake pedals and clutch pedals for motor vehicles.
1.2 This standard is applicable to mechanical articulated metal brake pedals and clutch pedals for motor vehicles; it also serves as a reference for other types of pedal devices.
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 document (including any amendments) applies.
GB/T 5620 Road vehicles - Braking of automotive vehicles and their trailers - Vocabulary
GB/T 10125-2012 Corrosion tests in artificial atmospheres - Salt spray tests
3 Terms and definitions
For the purposes of this standard, the terms and definitions specified in GB/T 5620 and the following apply.
3.1
pedal device
control mechanism manipulate by the driver with foot
3.2
longitudinal displacement, LP1
vertical displacement of the pedal under the longitudinal force P1 vertical to the pedal surface and passing through the geometric center point of the pedal in the positive and negative directions, see Figure 1
Figure 1 Schematic diagram for longitudinal displacement
3.3
lateral displacement, LT
horizontal displacement of the pedal under the lateral force T parallel to the pedal surface and passing through the geometric center point of the pedal in the positive and negative directions, see Figure 2
Figure 2 Schematic diagram for lateral displacement
3.4
stiffness
vertical displacement of the pedal under the longitudinal force P2 vertical to the pedal surface and passing through the geometric center point of the pedal, see Figure 3
Figure 3 Schematic diagram for stiffness deformation
4 Performance requirements
4.1 Basic performance
4.1.1 Longitudinal displacement
The measured longitudinal displacement of pedal device shall not be greater than 2.0mm.
4.1.2 Lateral displacement
The measured lateral displacement of pedal device shall not be greater than 4.0mm.
4.1.3 Stiffness
The measured longitudinal displacement of pedal device shall not be greater than 5.0mm.
4.2 Temperature adaptability
4.2.1 High-temperature adaptability
During the test, the pedal device shall be free from interference, jamming and abnormal noise. After the test, the measured longitudinal displacement and lateral displacement of pedal device shall meet the requirements of 4.1.1 and 4.1.2 respectively.
4.2.2 Low-temperature adaptability
During the test, the pedal device shall be free from interference, jamming and abnormal noise. After the test, the measured longitudinal displacement and lateral displacement of pedal device shall meet the requirements of 4.1.1 and 4.1.2 respectively.
4.3 Torsion resistance
Pedals and welds shall be free from crack or damage.
4.4 Strength
For the pedal device, its permanent deformation shall not be greater than 5.0mm, and it shall be free from crack or damage.
4.5 Working durability
4.5.1 During the working durability test, the pedal device shall be free from deformation affecting its function, and be free from cracks or other abnormality.
Contents of QC/T 788-2018
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Performance requirements
5 Test-related requirements
6 Test methods
