QC/T 961-2013Performance requirements and bench test methods for plastic reservoir assemblies of hydraulic braking systems (English PDF)

1 Scope

This Standard specifies the terms and definitions, performance requirements and bench test methods of plastic reservoir for automotive hydraulic brake system.

This Standard is applicable to plastic reservoir for automotive hydraulic brake system; plastic reservoir of automotive clutch master cylinders may be implemented by reference.

2 Normative Reference

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 document.

GB 11121 Gasoline Engine Oils

GB 11122 Diesel Engine Oils

GB 17930 Gasoline for Motor Vehicles

GB 18351 Ethanol Gasoline for Motor Vehicles

3 Terms and Definitions

For the purpose of this Standard, the following terms and definitions apply.

4 Performance Requirements

4.1.5.1 Total capacity. Measure according to 5.1.5.1 of this Standard; and the total capacity of the reservoir shall meet the requirements of the product technical document.

4.1.5.2 Partition capacity. Measure according to 5.1.5.3 of this Standard; and the partition capacity of any cavity of liquid storage chamber shall meet the design requirements.

4.1.6 Strength of the installation part. This Standard shall test the reservoir directly installed on the brake master cylinder according to 5.1.6 of this Standard. The reservoir and the connection part with the master cylinder shall not be broken, cracked or deformed; and shall be able to return to the original position after unloading.

4.1.7 Heat resistance. According to 5.1.7 of this Standard, the reservoir shall be free of cracks, softening and deformation affecting functions. During the entire test, there shall be no brake fluid overflowing from the reservoir. The brake fluid level of the reservoir shall be clearly visible; the fluid level indicator shall meet the requirements of 4.2.1 and 4.2.2 of this Standard. For reservoir cover with screw-tightened structure, the residual locking torque shall be no less than 50% of the initial tightening torque.

4.1.8 Cold resistance. Test according to 5.1.8 of this Standard; and the reservoir shall be free of cracks and deformations that affect functions. The brake liquid level of the reservoir shall be clearly visible; the liquid level indicator shall meet the requirements of 4.2.1 and 4.2.2 of this Standard. For reservoir cover with screw-tightened structure, the residual locking torque shall be no less than 50% of the initial tightening torque.

Other structures shall be in accordance with the provisions of the product technical documents.

4.1.9 Temperature shock performance. Test according to 5.1.9 of this Standard; the reservoir shall be free of cracks, softening and deformation that affects functions.

During the entire test, it should not have brake fluid overflow from the reservoir. The brake liquid level of the reservoir shall be clearly visible; the liquid level indicator shall meet the requirements of 4.2.1 and 4.2.2 of this Standard. For reservoir cover with screw-tightened structure, the residual locking torque shall be no less than 50% of the initial tightening torque. Other structures shall be in accordance with the provisions of the product technical documents.

4.1.10 Vibration durability. Test according to 5.1.10 of this Standard. The reservoir shall be free of cracks or damage; all parts shall be intact and work normally. During the entire test, it should not have brake fluid overflow from the reservoir. The static workability of the liquid level indicator shall meet the requirements of 4.2.1 of this Standard. For reservoir cover with screw-tightened structure, the residual locking torque shall be no less than 50% of the initial tightening torque. Other structures shall be in accordance with the provisions of the product technical documents.

Other structures shall be in accordance with the provisions of the product technical documents.

5 Test Methods

5.1.1.1 Block all liquid outlets of the reservoir.

5.1.1.2 Connect the brake fluid filling port of the reservoir to the vacuum source; and after the absolute pressure of the system reaches (250±50) Pa; cut off the vacuum source.

5.1.1.3 Measure and record the pressure rise value in the reservoir within 20s.

5.1.3 Water resistance of the reservoir cover.

5.1.3.1 Seal all the liquid outlets of the dry reservoir.

5.1.3.2 Put the reservoir cover according to the provisions of the product technical documents.

5.1.3.3 Install the reservoir on the test fixture according to the actual vehicle installation angle.

5.1.3.4 From the two directions of top and side of the reservoir cover, spray water at a flow rate of no less than 3800mL/min for 5min.

5.1.3.5 After the test, wipe the water on the outer surface of the reservoir with a dry cloth; open the reservoir cover; observe and record whether there is water seeping into the reservoir.

5.1.4 The air permeability of the reservoir cover.

5.1.4.1 Seal the liquid outlet of the reservoir by a plug, and then fix it on the test device according to the actual vehicle installation state.

5.1.4.2 Fill the brake fluid to 5mm above the maximum level; put the reservoir cover according to the provisions of the product technical documents.

5.1.4.3 Open any liquid outlet, observe and record the flow of brake fluid.

5.1.5 Capacity of the reservoir.