QC/T 764-2015Road vehicles - Hydraulic braking systems - Simple flare pipes, tapped holes, male fittings and hose end fittings (English PDF)

Foreword

This standard was prepared in accordance with the rules given in GB/T 1.1 - 2009 "Directives for standardization - Part 1: Structure and drafting of standards".

This standard replaces QC/T 764-2006 "Motor vehicles - Hydraulic braking systems - Pipes tapped holes male fittings and hose end fittings". As compared with QC/T 764-2006, the main technical changes are as follows:

- MODIFY the basic dimensions, limit deviations and rupture pressures of some pipes (see Table 1; Table 1 of the 2006 version);

- MODIFY the yield strength of the metal pipe material from 200 MPa to 180 MPa (see Table 2; Table 3 of the 2006 version);

- For the salt spray test standard, USE GB/T 10125-2012 to replace GB

2423.17 (see 3.1.3 and 3.4.2; 3.4 of the 2006 version);

- MODIFY the surface treatment requirements for metal pipes and threaded joints (see 3.1.3 and 3.4.2; 3.4 and 5.2 of the 2006 version);

- MODIFY the tolerance of D3 (see Table 3; Table 2 of the 2006 version);

- ADD two new types of tapped hole openings (see Figure 2b and Figure 3);

- MODIFY the tolerance of D7 and the dimensions of L1; ADD the dimensions of D10; DELETE the dimensions of L7 (see Table 4; Table 4 of the 2006 version);

- MODIFY the dimensions of the opening of wrench for tapped fittings (see Table 5; Table 5 of the 2006 version);

- MODIFY the minimum rupture torque of the M10 × 1 and M12 × 1 tapped fittings (see Table 6; Table 6 of the 2006 version).

1 Scope

This standard specifies the basic dimensions, performance, material requirements for simple flare pipes (hereinafter referred to as "metal pipes"), tube tapped holes, male fittings and hose end fittings for hydraulic braking system of road vehicles.

This standard applies to road vehicles which are equipped with hydraulic braking systems.

2 Normative references

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard.

GB/T 10125-2012 Corrosion tests in artificial atmospheres - Salt spray tests

YB/T 4164 Double wall copper-brazed steel tubing

3 Technical requirements