Rack of steering gear for passenger car
1 Scope
This document specifies the technical requirements and test and testing methods for the racks of steering gear for passenger cars.
This document is applicable to the racks of steering gear for passenger cars (the parts on mechanical properties and heat treatment are applicable to medium-carbon and medium-alloy structural steels).
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 5617 Determination of effective depth of hardening after induction or flame hardening of steel
QC/T 529-2013 Motor vehicles - Hydraulic power steering gear - Technique requirements and test methods
QC/T 972-2014 Technical requirements and test method for motor vehicle-electronically controlled hydraulic power steering gear
QC/T 1081-2017 Automobile electrical power steering gear
QC/T 29096-2014 The bench test methods of automobile steering gear
QC/T 29097-2014 The technical specifications of automobile steering gear
ISO 16232 Cleanliness
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
edge hardness
hardness measured near the edge of the specimen with a durometer
Note: Considering influence factors such as the stability of the specimen under stress during test, the influence depth of the straightening of the outer surface of the specimen and the size of the indenter of the durometer, the position is generally selected at about 2mm from the outer edge of the indentation to the outer surface.
3.2
a quarter of D hardness
hardness at half of the radius
3.3
surface hardness
hardness measured directly by a durometer on the surface of rack material cylinder
Note: When steering gear manufacturers are more concerned about the surface hardness, they may choose to test the hardness at this position. However, because the indentation is curved when the hardness is detected at this position, the hardness value is not accurate enough. The hardness value shall be compensated according to the curvature radius of the material and the hardness testing standard.
4 Technical requirements
4.1 General requirements
4.1.1 The racks of steering gear for passenger cars shall be manufactured, verified and validated in accordance with prescribed procedures and design specifications, drawings and process requirements.
4.1.2 The overall structure of a rack of steering gear for passenger car includes the threaded ends on both sides, gear milling section, ball screw, or polished rod.
4.1.3 Potential failure mode analysis and corresponding strength calculation shall be carried out in the design process of racks of steering gear for passenger cars.
Contents
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
5 Tests and testings
Rack of steering gear for passenger car
1 Scope
This document specifies the technical requirements and test and testing methods for the racks of steering gear for passenger cars.
This document is applicable to the racks of steering gear for passenger cars (the parts on mechanical properties and heat treatment are applicable to medium-carbon and medium-alloy structural steels).
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature
GB/T 229 Metallic materials - Charpy pendulum impact test method
GB/T 5617 Determination of effective depth of hardening after induction or flame hardening of steel
QC/T 529-2013 Motor vehicles - Hydraulic power steering gear - Technique requirements and test methods
QC/T 972-2014 Technical requirements and test method for motor vehicle-electronically controlled hydraulic power steering gear
QC/T 1081-2017 Automobile electrical power steering gear
QC/T 29096-2014 The bench test methods of automobile steering gear
QC/T 29097-2014 The technical specifications of automobile steering gear
ISO 16232 Cleanliness
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
edge hardness
hardness measured near the edge of the specimen with a durometer
Note: Considering influence factors such as the stability of the specimen under stress during test, the influence depth of the straightening of the outer surface of the specimen and the size of the indenter of the durometer, the position is generally selected at about 2mm from the outer edge of the indentation to the outer surface.
3.2
a quarter of D hardness
hardness at half of the radius
3.3
surface hardness
hardness measured directly by a durometer on the surface of rack material cylinder
Note: When steering gear manufacturers are more concerned about the surface hardness, they may choose to test the hardness at this position. However, because the indentation is curved when the hardness is detected at this position, the hardness value is not accurate enough. The hardness value shall be compensated according to the curvature radius of the material and the hardness testing standard.
4 Technical requirements
4.1 General requirements
4.1.1 The racks of steering gear for passenger cars shall be manufactured, verified and validated in accordance with prescribed procedures and design specifications, drawings and process requirements.
4.1.2 The overall structure of a rack of steering gear for passenger car includes the threaded ends on both sides, gear milling section, ball screw, or polished rod.
4.1.3 Potential failure mode analysis and corresponding strength calculation shall be carried out in the design process of racks of steering gear for passenger cars.
Contents of QC/T 1191-2023
Contents
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
5 Tests and testings
