CJ/T 242-2007 in English

1 Scope
This standard specifies terms / definitions, requirements, test methods, test rules marking, packaging, transportation and storage of external automatic brake adjuster for city buses (hereinafter referred to as automatic brake adjuster).
This standard is applicable to automatic brake adjusters for city buses, and the adjusters for vehicles of other kinds may reference this standard.

2 Normative References
Provisions of the following documents, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. Parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest editions of the normative documents are applicable to this standard.
GB/T 6388 Transport package shipping mark
GB/T 13384 General specifications for packing of mechanical and electrical product

3 Terms and Definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
Automatic brake adjuster
Component used for pneumatic cam drum brake, to automatically compensate set clearance between brake lining and brake drum
3.2
Free clearance
Displacement measured on the adjuster length certain given distance away from the worm wheel center under the condition that the fixed worm wheel applies bidirectional turning moment on the case of the automatic brake adjuster

4 Requirements
4.1 Automatic brake adjuster shall be manufactured in accordance with the requirements of design drawings and technical documents approved through stipulated procedures.
4.2 Adjustment of force moment
As recommended by the manufactory, the worm screw is rotated a cycle along the clearance downward direction and a cycle along the clearance upward direction, and the force moment gotten at each direction must not exceed the recommended value given by the manufactory.