This standard specifies the product classification, fundamental performance parameters, technical requirements, manufacturing requirements, test methods, inspection rules, and marking, packaging, transportation and storage, etc. of draft gears for locomotives and cars.
This standard is applicable to the draft gears for locomotives and cars.
2 Normative References
The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding corrections to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB/T 528-1998 Rubber, Vulcanized or Thermoplastic - Determination of Tensile Stress-Strain Properties (eqv ISO 37:1994)
GB/T 531-1999 Rubber-Determination of Indentation Hardness by Means of Pocket Hardness Meters (idt ISO 7619:1986)
GB/T 1222 Spring Steels
GB/T 1348 Spheroidal Graphite Iron Castings
GB/T 1681-1991 Rubber - Determination of Rebound Resilience of Vulcanizates (eqv ISO 4662:1986)
GB/T 1682-1994 Rubber, Vulcanized-Determination of Low-temperature Brittleness (Single Test Piece Method)
GB/T 3077 Alloy Structure Steels
GB/T 3512-2001 Rubber, Vulcanized or Thermoplastic -Accelerated Ageing and Heat Resistance Tests - Air-oven Method (eqv ISO 188:1998)
GB/T 4549.4-2004 Railway Vehicle Vocabulary - Part 4: Coupler, Draft Gear and Vestibule Diaphragm
GB/T 7759-1996 Rubber, Vulcanized or Thermoplastic - Determination of Compression Set at Ambient, Elevated or Low Temperatures
GB/T 7762-2003 Rubber, Vulcanized or Thermoplastic - Resistance to Ozone Cracking - Static Strain Test
GB/T 8923-1988 Rust Grades and Preparation Grades of Steel Surfaces Before Application of Paints and Related Products
GB/T 9444-1988 The Methods for Magnetic Particle Testing and for Specifying Quality Levels of Steel Castings
GB/T 11211-1989 Rubber Vulcanized - Determination of Adhesion to Metal - Tension Method (eqv ISO 814:1986)
GB/T 12361 General Specification of Steel Die Forgings
GB/T 12362 Tolerances and Machining - Allowances of Steel Die Forging
GB/T 13819 Copper Alloy Castings
GB/T 15822-1995 Methods for Magnetic Particle Testing
TB/T 66 Technical Conditions for Brake Springs of Locomotives and Cars
TB/T 1025 Technical Conditions for Supply of Hot Coiled Helical Compression Spring for Rolling Stock (eqv UIC 822 o:1974)
TB/T 1464 General Specification of Carbon Steel Castings for Rolling Stock
TB/T 1465 General Specification of Spheroidal Graphite Iron Castings for Rolling Stock
TB/T 2942 Specification of Purchase and Acceptance of Steel Castings for Railway
3 Terminologies and Definitions
For the purposes of this standard, the terminologies and definitions established in GB/T 4549.4-2004 and the following ones apply.
3.1
Rated travel
In the drop hammer test by the established procedures, it refers to the travel when the draft gear reaches or is approximate to the rated resistance (the average of two times) or leaves 0.25mm before reaching dead compression (whichever reaches first) in two consecutive times of hammering in the same height of fall. In the impact test, it refers to the travel when the draft gear reaches the rated resistance.
3.2
Maximum travel
In the drop hammer test by the established procedures, it refers to the travel when the draft gear reaches or is approximate to the maximum resistance (the average of two times) or leaves 0.25mm before reaching dead compression (whichever reaches first) in two consecutive times of hammering in the same height of fall. In the impact test, it refers to the travel when the draft gear reaches the maximum resistance.
