1 Scope
This standard specifies the terms and definitions, types, basic parameters and sizes, technical requirements, test methods and inspection rules of electro-hydraulic drum brakes (hereinafter referred to as brake).
This standard is applicable to the drum brake using electro-hydraulic thrusters (hereinafter referred to as thruster) as the driving device.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction 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 191 Packaging - Pictorial marking for handling of goods (GB/T 191-2000, eqv ISO 780:1997)
GB/T 1239.2 Cold coiled helical compressions springs-Technical specifications
GB/T 1239.4 Hot coiled helical springs-Technical specifications
GB/T 1239.6 Design of cylindrical helical springs
GB/T 6461 Methods for corrosion testing of metallic and other inorganic coatings on metallic substrates--Rating of test specimens and manufactured articles subjected to corrosion tests (GB/T 6461-2002, ISO 10289:1999, IDT)
GB/T 8923 Rust grades and preparation grades of steel surfaces before application of paints and related products (GB/T 8923-1988.eqv ISO 8501-1:1988)
GB/T 9286 Paints and varnishes-Cross cut test for films (GB/T 9286-1998, eqv ISO 2409:1992)
GB/T 10125 Corrosion tests in artificial atmospheres-Salt spray tests (GB/T 10125-1997, eqv ISO 9227:1990)
GB/T 13306 Plates
GB/T 13384 General specification for packagings of mechanical and electrical products
GB/T 13452.2 Paints and varnishes - Determination of film thickness (GB/T 13452.2-1992, idt ISO 2808:1974)
GB/T 15957 Corrosivity classification of atmospheric environment
JB/T 5000.12 The heavy mechanical general techniques and Standards Coating
JB/T 6540 Brake-Terms
JB/T 7021 Drum brake connecting dimensions
JB/T 10603 Electro-hydraulic thrusters
3 Terms and Definitions
For the purpose of this standard, the terms and definitions established in JB/T 6540 and the following ones apply.
3.1
Brake releasing
Brake shoe braking visard releases contact with braking couple braking surface and eliminates braking moment.
3.2
Brake setting
Brake shoe braking visard contacts with braking couple braking surface and sets braking moment.
3.3
Applying force by the brake-spring
Spring force that generates braking force or braking moment
3.4
Rated applying force by the brake-spring
Spring force that generates rated braking force or rated braking moment
3.5
Shoes clearance
It refers to the average distance from the shoe braking visard to the braking couple braking surface under the released state of brake.
3.6
Shoes aligning
Through some devices or some measures, where the brake is closed, shoe braking visard can normally contact with the braking couple braking surface; under the normal release state, any position of braking visard cannot contact with the braking couple braking surface.
3.7
Working stroke of the thruster
It refers to the distance that thruster push rod moves from the working initial position to the final position when the brake is working.
3.8
Work for once braking
It refers to the friction braking work made by or the braking energy generated by the once dynamic braking of brake.
