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GB/T 22310-2008 English PDF (GBT22310-2008)

GB/T 22310-2008 English PDF (GBT22310-2008)

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GB/T 22310-2008: Road vehicles -- Brake linings -- Effects of heat on dimensions and form of disc brake pads-test procedure
This standard specifies a comprehensive method, for measuring disc brake pads, to determine dimensional change as a function of temperature and their heat transfer. Dimensions include: - Thickness; - Certain profile dimensions of brake pads, whose variations may lead to brake failure. This standard applies to disc brake pads for road vehicles. The dimensions shall not exceed: width 120 mm, height 80 mm, thickness 20 mm. It shall be the entire molded or bonded type pads with a solid back plate.
GB/T 22310-2008
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.40
Q 69
GB/T 22310-2008 / ISO 6313:1980
Road vehicles - Brake linings - Effects of heat on dimensions
and form of disc brake pads - Test procedure
(ISO 6313:1980, IDT)
ISSUED ON: AUGUST 20, 2008
IMPLEMENTED ON: APRIL 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
0 Introduction ... 4
1 Scope ... 4
2 Normative references ... 4
3 Terms, symbols, meanings ... 5
4 Sampling and conditions ... 5
5 Test device ... 6
6 Test method ... 8
7 Report of results ... 9
8 Test report ... 9
Road vehicles - Brake linings - Effects of heat on dimensions
and form of disc brake pads - Test procedure
0 Introduction
This standard specifies the test method, for thermally affected dimensional changes of disc brake pads. It also specifies a test method, for heat conduction of disc brake pads, in the direction of applied pressure. The test device may be designed to test one or two disc brake pads. Drum brake linings may also make reference to this standard. According to this standard, record the disc brake pad dimensional changes and temperatures, in the contact area under force. The friction surface of the disc brake pads faces a heating plate, that is programmed for a given temperature and time. 1 Scope
This standard specifies a comprehensive method, for measuring disc brake pads, to determine dimensional change as a function of temperature and their heat transfer. Dimensions include:
- Thickness;
- Certain profile dimensions of brake pads, whose variations may lead to brake failure.
This standard applies to disc brake pads for road vehicles. The dimensions shall not exceed: width 120 mm, height 80 mm, thickness 20 mm. It shall be the entire molded or bonded type pads with a solid back plate.
2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.
away from the contact surface (see Figure 2). If the disc brake pads are equipped with sound-insulating pads, place a 4 mm x 80 mm x 100 mm heat transfer plate, between the pads and the fixture, to measure heat conduction. The heat transfer plate's temperature is measured by a thermocouple, which is mounted in a small hole extending to the center of the heat transfer plate (see Figure 2).
The clamping plate, that clamps the disc brake pad, is equipped with a device capable of applying a force of 20 N ~ 200 N. The movement meter on the same side can measure the data of the movement of the back plate or middle plate.
6 Test method
6.1 Put the disc brake pads, which are treated according to Chapter 4, between the heating plate and the fixture, with the friction surface facing the heating plate; the pressure on the surface of the brake pads is about 0.02 N/mm2.
6.2 If the disc brake pads are equipped with sound-insulating pads, place a middle plate between the pads and the clamp. Fit the scale indicator or move the sensor; zero it. 6.3 Start the heating, so that it reaches the final temperature of 400 °C, at the end of the 10 min heating.
Note: Under certain conditions, especially when testing a particular type of vehicle brake pad, it may be necessary to reach a final temperature above 400 °C, in less than 10 minutes. 6.4 Depending on the equipment used, it is necessary to measure the change in the thickness of the pad and the temperature of the heating plate, as well as the temperature change of the friction material and the back or middle plate, during heating and cooling. If the measured data is not recorded by a recorder, then the heating plate shall be between 50 °C and the final temperature, which is read at 25 °C intervals. 6.5 After reaching the final temperature, turn off the heat source and enter the cooling stage. During the cooling period, the equipment is naturally cooled; it is not necessary to blow cold air to the heating plate to cool down.
6.6 When the heating plate is cooled to 50 °C, immediately start the heat source again to repeat the above procedure. During the second heat, no adjustment is necessary, whatever the circumstances.
6.7 At the end of the test, measure the size of the brake pad at room temperature, the value of which is dBi.
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