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[GB/T 26753-2011] Rubber diaphragms for brake chamber in automobile
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Basic data
| Standard ID | GB 26753-2011 (GB26753-2011) |
| Description (Translated English) | [GB/T 26753-2011] Rubber diaphragms for brake chamber in automobile |
| Sector / Industry | National Standard |
| Classification of Chinese Standard | G43 |
| Classification of International Standard | 83.140.50; 43.040.40 |
| Word Count Estimation | 10,196 |
| Date of Issue | 2011-07-20 |
| Date of Implementation | 2012-05-01 |
| Quoted Standard | GB/T 528; GB/T 531.1; GB/T 532; GB/T 1682; GB/T 2828.1; GB/T 2941; GB/T 3512; GB/T 5721; GB/T 7759; QC/T 790-2007 |
| Regulation (derived from) | Announcement of Newly Approved National Standards No. 10 of 2011 |
| Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China |
| Summary | This Chinese standard specifies the automobile brake chamber rubber diaphragm (hereinafter referred to as the diaphragm) requirements, test methods, inspection rules and signs, packaging, transport and storage. This standard applies to automobile brake chamber with a rubber septum. |
GB 26753-2011: [GB/T 26753-2011] Rubber diaphragms for brake chamber in automobile
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Rubber diaphragms for brake chamber in automobile
ICS 83.140.50; 43.040.40
G43
National Standards of People's Republic of China
Automobile brake chamber rubber diaphragm
Issued on. 2011-07-20
2012-05-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
3.4,3.5,3.6,3.7,3.8 this standard is mandatory, the rest are recommended.
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Rubber and rubber products sealing products Standardization Technical Committee Technical Committee (SAC/TC35/SC3)
Centralized.
This standard was drafted. Guizhou public Rubber Co., Ningboqiaoshi Rubber Co., Ltd., Anhui Ding seals Co., Ltd.,
Qingdao Beihai Sealing Technology Co., Ltd. Northwest Rubber Plastic Research and Design Institute, Zhuzhou Times New Material Technology Co., Ltd., Chongqing Cafu
Steering Automotive Brake System Co., Ltd.
The main drafters of this standard. Ma Ning, Wang Dawei, Chen Jinyang, Xu Ligang, high Leong, Wang Jin, Jiang Guoying, Tanwen Xing, Ma Bing.
Automobile brake chamber rubber diaphragm
1 Scope
This standard specifies the automobile brake chamber rubber diaphragm (hereinafter referred to as the diaphragm) requirements, test methods, inspection rules and signs, packaging, transportation
Transport and storage.
This standard applies to automobile brake chamber with a rubber septum.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 528 Determination of vulcanized rubber or thermoplastic rubber tensile stress-strain properties
GB/T 531.1 vulcanized rubber or thermoplastic rubber hardness test pushed Part 1. Shore hardness method (Shore hardness)
Determination of GB/T 532 vulcanized rubber or thermoplastic rubber and fabric adhesive strength
GB/T 1682 Determination of vulcanized rubber low temperature brittleness Single Specimen
GB/T 2828.1 Sampling procedures for inspection - Part 1. by acceptance quality limit (AQL) retrieval batch inspection sampling plan
GB/T 2941 rubber physical test method for preparing and conditioning General Procedure
GB/T 3512 vulcanized rubber or thermoplastic rubber hot air and heat accelerated aging test
GB/T 5721 rubber seal products logo, packaging, transportation and storage of general provisions
GB/T 7759 vulcanized rubber, thermoplastic rubber at room temperature, high and low temperature compression set determination
QC/T 790-2007 brake chamber performance requirements and test methods of
3 Requirements
3.1 Physical properties of vulcanized rubber
Physical properties of vulcanized rubber should meet the requirements in Table 1.
Table 1 Physical properties of vulcanized rubber
No. Physical Performance
1 Hardness (Shore A) 50 ± 5 60 ± 5 68 ± 5
Tensile strength/MPa minimum 121 215
3 Elongation at break /% min 350 350 400
4 compression set (70 ℃ × 24h) /% maximum 353,535
5 brittle temperature/℃ highest -45-45-45
A hot air aging
Change in hardness (Shore A)
Tensile strength change rate /% maximum
Elongation at break change rate /% maximum
-5 To 10
-25
-30
-5 To 10
-25
-30
0-5
-15
-25
Table 1 (continued)
No. Physical Performance
7 and the adhesive strength of the vulcanized rubber fabric/(kN/m) Minimum 668
For a material hardness of 50 ± 5 and 60 ± 5, the hot air aging conditions of 70 ℃ × 72h, the hardness of 68 ± 5 material, hot air aging strip
Member of 80 ℃ × 72h.
3.2 Reinforcements
Manufacturing membrane materials used comply with the relevant standard requirements of customers.
3.3 diaphragm size
Membrane is shown in Figure 1, the separator should be sized in accordance with Table 2 or drawings of design requirements.
1 a schematic diagram of the diaphragm
Table 2 diaphragm dimensions and tolerances in millimeters
Type φD (outside diameter) H (full height) t (bottom thickness)
TYPE09 127.8 ± 1.5 34.4 ± 0.7 3.2 ± 0.3
TYPE12 139.0 ± 1.5 37.0 ± 0.7 3.0 ± 0.3
TYPE14 147.0 ± 1.5 37.0 ± 0.7 3.0 ± 0.3
TYPE16 158.0 ± 1.5 34.4 ± 0.7 3.2 ± 0.3
TYPE20 169.7 ± 1.5 34.4 ± 0.7 3.2 ± 0.3
TYPE24 178.0 ± 1.5 40.0 ± 0.7 4.0 ± 0.3
TYPE28 188.5 ± 1.5 39.5 ± 0.7 3.2 ± 0.3
TYPE30 201.0 ± 1.5 39.5 ± 0.7 3.0 ± 0.3
TYPE36 221.0 ± 1.5 43.0 ± 0.7 3.6 ± 0.3
3.4 appearance quality diaphragm
Appearance quality should be consistent with the provisions of the diaphragm in Table 3.
Table 3 Appearance Quality diaphragm
No. Name Index defect
1 mold marks are allowed, but the unevenness of not more than 0.3mm, grow up to 1.5mm
2 bubble diameter of not more than 2mm, no more than 0.5mm deep bubbles, allowed many to 2
3 impurity has not allowed
4 missing glue grow up to 2mm, width is not more than 1.5mm, depth of not more than 0.5mm, allowed many to 2
5 fabric fracture has not allowed
6 trimming deep damage is not greater than 1mm, a total length of no more than 1/6 of the perimeter
7 edge burrs projecting high not permit more than 1mm
8 Flow marks (including water ripples and minor pitting) are allowed, but not allowed to have split
9 surrounding the lack of cloth have not allowed
The cumulative total number of 10 defective item No. 2,4 defects are not allowed more than four
3.5 diaphragm pressure resistance
After the pressure test, the membrane should be intact, no damage, and the sealing performance should meet the QC/T 790-2007 requirements of 5.1.
3.6 cryogenic sealing septum
Low temperature sealing performance should meet the QC/T 790-2007 requirements of 5.4.
3.7 cryogenic operating characteristics of the membrane
Diaphragm after the test should not have visible cracks and damage. And shall meet the QC/T 790-2007 requirements of 5.7.
3.8 diaphragm life
Diaphragm life of 100 million times (400,000 times at room temperature; various high and low temperature 100,000 times; and then at room temperature 400,000 times), after testing the product in good condition, no
damage.
Test Method 4
4.1 Preparation of vulcanized rubber samples conducted in accordance with GB/T 2941's.
4.2 hardness according to GB/T 531.1 requirements.
4.3 tensile strength, elongation at break were by GB/T 528 requirements.
4.4 Compression set according to the provisions of GB/T 7759 progresses, type B samples.
4.5 hot air aging according to the provisions of GB/T 3512 will be.
4.6 brittleness temperature according to the provisions of GB/T 1682 will be.
4.7 adhesive strength of the vulcanized rubber and fabric conducted in accordance with GB/T 532's.
4.8 diaphragm size measurement according to the provisions of GB/T 2941 will be.
4.9 appearance quality diaphragm visually and indexing is 0.02mm gage measurements.
Diaphragm pressure resistance was 4.10 according to the provisions in 6.10.1.2 QC/T 790-2007.
4.11 low temperature sealing performance diaphragm conducted in accordance with QC/T 790-2007 in 6.5.
Low temperature characteristics 4.12 diaphragm conducted in accordance with QC/T 790-2007 in 6.8.
4.13 diaphragm life test conducted according to the provisions of Appendix A.
5 Inspection Rules
5.1 Continuous production of the same compounds in not more than 5000kg batch.
5.2 In the same conditions, continuous production and delivery of the first test of its kind, with product specifications to no more than 10,000 batch.
The physical properties of the vulcanized rubber test should be 5.3 per roll rubber compound random number required, sample preparation conditions prescribed, according to
Table 1 1 to 3 and Item 7 factory inspection; Table 1, item 4 and item 6 test once a month.
5.4 Unless otherwise specified, each batch separator size according to the GB/T 2828.1 general test level Ⅱ, AQL sampling is 4.0
test.
5.5 diaphragm should look checking each item.
5.6 diaphragm pressure resistance, low temperature sealing performance, low temperature performance and life test at least once every six months.
5.7 Type inspection should include all the requirements of Chapter 3, when one of the following conditions, type of inspection should be carried out.
--- The product to the plant (to change the production site) the production or appraisement time;
--- After the official production, such as materials, processes are at greater change may affect product performance;
--- Product discontinuation more than three months, the production recovery;
--- Factory inspection results are quite different when the last type inspection;
--- National quality supervision agency type inspection requirements.
5.8 When the physical properties of vulcanized rubber failure, double the sample to be taken for the project failed re-inspection, if still unqualified, the batch separator
To be defective.
5.9 When unqualified appearance quality diaphragm, the diaphragm is defective. When the diaphragm pressure resistance, low temperature sealing performance, low temperature
Work performance and life test failure should be taken twice the sample retest, if still unqualified, the batch separator to be defective.
6 signs, packaging, transportation and storage
6.1 Unless otherwise specified, marking, packaging, transportation and storage should be consistent with GB/T 5721 regulations.
6.2 Unless otherwise specified, each packaging shall be fitted with a specification of the product.
6.3 Subject to the provisions of 6.1 and 6.2 for storage conditions of the product is 2 years.
Appendix A
(Normative)
Automobile brake chamber rubber diaphragm life test method
A.1 means
Life test apparatus shall comply with the diaphragm QC/T 790-2007 requirements of 6.11.
A.2 Sample
3.1,3.2,3.3,3.4 should comply with the requirements of a number of randomly selected membrane 4 to 6 as a sample, the sample structure and main dimensions
see picture 1.
Preparation before A.3 Test
Sample before assembly, inspection chamber of the main part size, appearance quality should be consistent with the provisions of QC/T 790-2007 in.
A.4 Test procedure
A.4.1 The test brake chamber secured to the holder, samples were mounted in the brake chamber piston and correcting the position of the specimen, so that the two
Respectively, in a free state, with a tight clamp hoop.
A.4.2 Limit seat adjustment nut to reach full stroke stroke 0.75SN ± 0.05SN.
NOTE. SN refers to the manufacturer's technical documentation specified brake chamber push rod stroke of work.
A.4.3 power, gas supply, adjust the air pressure regulator to 0.7 0.2-0.1MPa.
A.4.4 room temperature sealing
At a temperature of (27 ± 11) placed under ℃ 2h, air pressure is applied 0.7 0.2-0.1MPa, packing 1min, the pressure drop is not greater than 10kPa.
A.4.5 low temperature sealing
At a temperature of (-40 ± 2) placed under ℃ 16h, air pressure is applied 0.7 0.2-0.1MPa, packing 1min, the pressure drop is not greater than 10kPa.
A.4.6 high temperature sealing
At a temperature of (80 ± 5) placed under ℃ 16h, air pressure is applied 0.7 0.2-0.1MPa, packing 1min, the pressure drop is not greater than 10kPa.
A.4.7 Dynamic room temperature
At a temperature of (27 ± 11) ℃, the air pressure is applied 0.7 0.2-0.1 MPa, working stroke. 0.75SN ± 0.05SN, frequency (15 ± 1) times/min, count
Reached 400,000 times the test is stopped, to see if there is a leak. Air pressure is applied 0.7 0.2-0.1 MPa, holding pressure 1min, the pressure drop is not greater than
10kPa.
A.4.8 low dynamic
At a temperature of (-40 ± 2) at ℃, air pressure is applied 0.7 0.2-0.1MPa, working stroke. 0.75SN ± 0.05SN, frequency (10 ± 1) times/min, count
Reached 100,000 times the test is stopped, to see if there is a leak. Air pressure is applied 0.7 0.2-0.1 MPa, holding pressure 1min, the pressure drop is not greater than
10kPa.
A.4.9 Dynamic temperature
At a temperature of (80 ± 2) at ℃, air pressure is applied 0.7 0.2-0.1MPa, working stroke. 0.75SN ± 0.05SN, frequency (6 ± 1) times/min, count
Reached 100,000 times the test is stopped, to see if there is a leak. Air pressure is applied 0.7 0.2-0.1 MPa, holding pressure 1min, the pressure drop is not greater than
10kPa.
A.4.10 Dynamic room temperature
A.4.7 press once again. Stop the test count reaches 400,000 (a total of up to 100 million times) when.
A.4.11 at a temperature of (27 ± 11) ℃, sample at 0.7 0.2-0.1 MPa pressure, packing 1min, observe the pressure drop is not greater than
10kPa; open observation chamber brake chamber rubber diaphragm (sample) should be no damage.
A.4.12 each intake time is less than 0.6s.
A.4.13 When the counter reading totaled one million times (also available in terms of the actual test time), the end of the test, the testing process each order
Failure of any one segment judges failed the test.
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