1 Scope
This standard specifies the terms and definitions, classification and composition, technical requirements, inspection, inspection rules as well as marking, packaging, transportation and storage for hand brakes of railway freight car.
It is applicable to hand brakes of railway freight car.
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 699 Quality Carbon Structural Steels
GB/T 700 Carbon Structural Steels
GB/T 1184 Geometrical Tolerancing - Geometrical Tolerance for Features without individual Tolerance Indications
GB/T 1804 Geometrical Tolerancing - Geometrical Tolerance for Linear and Angular Dimensions without Individual Tolerance Indications
GB/T 2100 Corrosion-resistant Steel Castings for General Applications
GB/T 3077 Alloy Structure Steels
GB/T 4549.3-2004 Railway Vehicle Vocabulary - Part 3: Brake Equipments
GB/T 6414 Castings - System of Dimensional Tolerances and Machining Allowances
GB/T 11352 Carbon Steel Castings for General Engineering Purpose
GB/T 12361-2003 General Specification of Steel Die Forgings
GB/T 12362-2003 Tolerances and Machining - Allowances of Steel Die Forging
GB/T 12363-2005 Classification of Forging Functions
GB/T 13819 Copper and Copper Alloy Castings
GB/T 15055 Permissible Stamping Variations in Dimensions without Tolerance Indication
GB/T 20878 Stainless and Heat-resisting Steels - Designation and Chemical Composition
GB/T 24814 Short Link Chain for Lifting Purposes - Grade 4, Non-calibrated, for Chain Slings etc.
GB/T 24816 Short Link Chain for lifting Purposes - Grade 8, Non-calibrated, for Chain Slings etc.
JB/T 6402 Castings for the Large Low Alloy Steels
TB/T 2942 General Technical Specifications of Steel Castings for Rolling Stock
3 Terms and Definitions
For the purposes of this document, the terms and definitions defined in GB/T 4549.3-2004 as well as the followings apply.
3.1
quickly release
terminate braking force at one time
3.2
gradual release
the braking force dwindling away in case of hand brake wheel rotation in counterclockwise direction and held if rotation stopping and hand wheels loosened
3.3
adjust force
the braking force is increased if rotating hand brake wheel in clockwise direction and decreased if in counterclockwise direction
3.4
leverage
the ratio of theoretical output force to input force of hand brake when hand braking efficiency is 100%
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification and Composition
5 Technical Requirements
5.1 Basic Requirements
5.2 Performance Requirements
5.3 Materials and Manufacturing Requirements
6 Inspection
6.1 Appearance Inspection
6.2 Dimension Inspection
6.3 Performance Test for Geared Hand Brake
6.4 Performance Test of Chained Hand Brake
7 Inspection Rules
7.1 End-of-manufacturing Inspection
7.2 Type Inspection
8 Marking, Packing, Transportation and Storage
8.1 Marking
8.2 Packaging
8.3 Transportation and Storage
Annex A (Normative) Requirements for Mounting of Hand Brake
1 Scope
This standard specifies the terms and definitions, classification and composition, technical requirements, inspection, inspection rules as well as marking, packaging, transportation and storage for hand brakes of railway freight car.
It is applicable to hand brakes of railway freight car.
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 699 Quality Carbon Structural Steels
GB/T 700 Carbon Structural Steels
GB/T 1184 Geometrical Tolerancing - Geometrical Tolerance for Features without individual Tolerance Indications
GB/T 1804 Geometrical Tolerancing - Geometrical Tolerance for Linear and Angular Dimensions without Individual Tolerance Indications
GB/T 2100 Corrosion-resistant Steel Castings for General Applications
GB/T 3077 Alloy Structure Steels
GB/T 4549.3-2004 Railway Vehicle Vocabulary - Part 3: Brake Equipments
GB/T 6414 Castings - System of Dimensional Tolerances and Machining Allowances
GB/T 11352 Carbon Steel Castings for General Engineering Purpose
GB/T 12361-2003 General Specification of Steel Die Forgings
GB/T 12362-2003 Tolerances and Machining - Allowances of Steel Die Forging
GB/T 12363-2005 Classification of Forging Functions
GB/T 13819 Copper and Copper Alloy Castings
GB/T 15055 Permissible Stamping Variations in Dimensions without Tolerance Indication
GB/T 20878 Stainless and Heat-resisting Steels - Designation and Chemical Composition
GB/T 24814 Short Link Chain for Lifting Purposes - Grade 4, Non-calibrated, for Chain Slings etc.
GB/T 24816 Short Link Chain for lifting Purposes - Grade 8, Non-calibrated, for Chain Slings etc.
JB/T 6402 Castings for the Large Low Alloy Steels
TB/T 2942 General Technical Specifications of Steel Castings for Rolling Stock
3 Terms and Definitions
For the purposes of this document, the terms and definitions defined in GB/T 4549.3-2004 as well as the followings apply.
3.1
quickly release
terminate braking force at one time
3.2
gradual release
the braking force dwindling away in case of hand brake wheel rotation in counterclockwise direction and held if rotation stopping and hand wheels loosened
3.3
adjust force
the braking force is increased if rotating hand brake wheel in clockwise direction and decreased if in counterclockwise direction
3.4
leverage
the ratio of theoretical output force to input force of hand brake when hand braking efficiency is 100%
Contents of TB/T 2978-2016
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification and Composition
5 Technical Requirements
5.1 Basic Requirements
5.2 Performance Requirements
5.3 Materials and Manufacturing Requirements
6 Inspection
6.1 Appearance Inspection
6.2 Dimension Inspection
6.3 Performance Test for Geared Hand Brake
6.4 Performance Test of Chained Hand Brake
7 Inspection Rules
7.1 End-of-manufacturing Inspection
7.2 Type Inspection
8 Marking, Packing, Transportation and Storage
8.1 Marking
8.2 Packaging
8.3 Transportation and Storage
Annex A (Normative) Requirements for Mounting of Hand Brake