The main purpose is to ensure that the transmission shaft seal shaft high speed grease seal, to prevent vehicles (especially cars) important seal leakage, lack of technical standards, seal shaft mostly adopt advanced international standards.
The sealing strip of automobile transmission shaft domestic OEMs used mostly by the first generation of asbestos rubber material gradually upgrade to the second generation and the third generation fiber rubber cork material fiber micro bubble rubber cork material, yield and quality has been greatly improved.
Characteristics and application of three generation transmission shaft seals
The biggest characteristic of the drive shaft 1, the first generation of asbestos rubber material sealing film is low cost, able to adapt to the high pressure and high temperature produced by the high speed running of the drive shaft. But the biggest drawback is that it contains carcinogenic substances - asbestos, so it has been banned in foreign countries, especially the United States and the European union. However, there are still many low-end cars in use in china.
The biggest characteristics of the 2 and second generation fiber rubber cork material transmission shaft seal is not contain asbestos, but also can adapt to high pressure and high temperature produced by the high speed running of transmission shaft. But it has a higher requirement for the metal surface of the transmission shaft sealing surface, and the sealing surface must be smooth. Most of the current domestic production of transmission shaft factory in the use of this transmission shaft sealing sheet, application models are Santana, Pastor, Audi, small red flag.
The biggest characteristics of the 3 and third generation of fiber micro bubble rubber cork material transmission shaft seal is based on the second generation, the rubber to micro foam rubber, so it has greater compressibility, ability to make up for the dual rough surface defect was greatly improved and the practical value of a sealing sheet high. The introduction of new domestic high-end cars and Japanese cars are gradually fitting the drive shaft sealing sheet.
Two, second generations of fiber, rubber, cork materials, transmission shaft seals, technical indicators
Fiber rubber, cork shaft seals must comply with the German Lv Bu Luo technical conditions 99060000013, and its main technical indicators are as follows:
| 序号 |
指标名称 |
单位 |
指标值 |
实际可达指标 |
| 1 |
压缩率 |
% |
≥45 |
46.5 |
| 2 |
永久变形 |
% |
≤35 |
27.8 |
| 3 |
耐热密封性 |
°C |
160 |
160 |
| 4 |
压缩应力 |
0.1mm |
Mpa |
≥1 |
4.31 |
| 0.7mm |
Mpa |
≤30 |
26.5 |
| 耐油性（150°C*5hr ASTM2#油） |
| 5 |
厚度变化率 |
% |
≤10 |
5.7 |
| 重量变化率 |
% |
≤70 |
13.8 |
| 热老化变形（100°C±3°C*60hr) |
| 6 |
热变形 |
% |
＜35 |
32.7 |
Technical specifications of third generation fiber micro bubble rubber, cork material and transmission shaft seal
Fiber micro foam rubber cork shaft seal must be in line with the United States M6008 technical conditions, and reiterated that the heavy metal content must comply with EU standards, testing standards allow the use of Chinese standard, the main technical indexes are as follows:
| 序号 |
指标名称 |
单位 |
指标值 |
实际可达标准 |
测试标准 |
| 1 |
压缩性 |
% |
30~50 |
41.6 |
GB/T20671.2--2006 |
| 2 |
回弹率 |
% |
≥75 |
88.2 |
GB/T20671.2--2006 |
| 3 |
拉伸强度 |
Mpa |
≥0.5 |
0.65 |
GB/T20671.2--2006 |
| 4 |
密度 |
G/cm³ |
0.5~0.6 |
0.57 |
GB/T533---2008 |
| 5 |
硬度 |
邵氏A |
30~50 |
46 |
GB/T533---2008 |
| 6 |
老化性能 |
硬度变化 |
% |
+15~0 |
10 |
120°C GB/T3512 |
| 7 |
硬度变化 |
% |
+15~0 |
12 |
135°C GB/T3512 |
| 8 |
铅（pb) |
PPM |
≤900 |
59 |
ISO6101-2,EDS-T-7804.EDS-A-0101 |
| 9 |
镉（cd) |
PPM |
≤90 |
36 |
ISO6101-2,EDS-T-7804.EDS-A-0101 |
| 10 |
六价铬（cr6) |
PPM |
≤900 |
0 |
ISO6101-2,EDS-T-7804.EDS-A-0101 |
| 11 |
汞（Hg) |
PPM |
≤900 |
0 |
ISO6101-2,EDS-T-7804.EDS-A-0101 |
