NBR HNBR oil seal rubber oil seal for shock absorber

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Metal case:Carbon steel
Color Black,red,yellow,blue,orange,brown,purple,etc
Availability OEM,ODM
Type Serrated,Grooved, Corrugated,flat,ring,others as customer’s requirement
Certification ISO9001,TS16949,SGS
Application Car suspension, automobile engine,hydraulic system,air pressure system,Etc.

Max Auto Parts Ltd supply local brand oil seals , we can also buy from NOK , NAK brand for customers .


item value
Warranty 1YEAR
Place of Origin China
Brand Name Max
Density 6.4-6.9 g/cm3 after steam oxidation
Material Fe-C-Cu Powder
Surface treatmen Steam oxidation, 2 hours, Fe3O4: 0.004-0.005mm, degree of oxidation 2-4%
Service OEM ODM
Density 6.4-6.9 g/cm3 after steam oxidation
Type DRILLING, Milling, Turning
Model Number: Custom-made Service
Product name: Powder Metal Sintered Part for Shock Absorber
Process Sintering+ Cnc
Application Shock Absorber
Unspecified ISO 2768 - m / H14, h14, +- IT14/2
Our Advantages 1. More than current 3000 moulds ,save your mold cost
2. ISO/TS 16949:2009 certificate
3.Competitive price
4.Strictly quality control capacity of APQP,FEMA,MSA,PPAP,SPC

Oil seal structure


Oil seals are generally divided into single type and assembly type.
Assembled type is the frame and lip material can be freely combined, generally used for special oil seals.

Oil seal and application
3.1.1 Oil seal
The oil seal is the seal of lubricating oil. Its function is to isolate the oil chamber from the outside world, seal oil inside and prevent dust outside. Oil seals are mostly used for the sealing of vehicle transmission and hub bearings.
(1) The characteristics and technical parameters of the oil seal
The difference between the oil seal and other lip seals is that it has a lip with greater resilience, the width of the sealing contact surface is very narrow (about 0.5mm), and the distribution pattern of the contact stress is pointed. Figure shows the typical structure of the oil seal and the schematic diagram of the contact stress of the lip. The cross-sectional shape of the oil seal and the clamping spring make the lip have better tracking compensation for the shaft. Therefore, the oil seal can obtain a better sealing effect with a smaller lip radial force.


Fig. Typical structure of oil seal and schematic diagram of lip contact stress

1-lip; 2-crown; 3-spring: 4-skeleton; 5-bottom: 6-waist; 7-accessory lip
Compared with other sealing devices, the oil seal has the following advantages.
①The structure is simple and easy to manufacture. Simple oil seals can be molded at one time, and even the most complex oil seals have an uncomplicated manufacturing process. The metal skeleton oil seal can also be composed of metal and rubber to form the required oil seal through stamping, gluing, inlaying, molding and other processes.
②Light weight and less consumables. Each oil seal is a combination of thin-walled metal parts and rubber parts, and its material consumption is very small, so each oil seal is very light in weight.
③ The installation position of the oil seal is small, the axial dimension is small, it is easy to process, and the machine structure is compact.
④ Good sealing performance and long service life. It has certain adaptability to the vibration of the machine and the eccentricity of the main shaft.
⑤Easy disassembly and maintenance.
⑥The price is cheap.
The disadvantage of the oil seal is that it cannot withstand high pressure, so it can only be used as a seal for bearing lubricating oil.
The working range of the oil seal: the working pressure is about 0.3MPa; the linear speed of the sealing surface is less than 4m/s, and the speed type is 4~15m/s; the working temperature is -60~150°C (related to the type of rubber); applicable The medium is oil, water and weak corrosive liquid; the service life is 500~2000h.

(2)Oil seal structure
The common oil seal structure is shown in the figure


Figure | Structure of common oil seals

① Bonded structure The characteristic of this structure is that the rubber part and the metal skeleton can be processed and manufactured separately, and then bonded together with glue to form an exposed skeleton type, which has the advantages of simple manufacture and low price. Countries such as the United States and Japan mostly adopt this structure. Their cross-sectional shapes are shown in Figure (a).

②Assembly structure It is to assemble the rubber lip, the metal frame and the spring ring to form the oil seal. It must have an inner and outer skeleton, and clamp the rubber lip. There is usually a baffle to prevent the spring from coming out [Figure (b)].

③Rubber-wrapped skeleton structure. It wraps the punched metal skeleton in rubber to form an inner skeleton type. Its manufacturing process is a little more complicated, but it has good rigidity and is easy to assemble, and it does not have high requirements for steel plate materials [Figure ( c)].

④ Full rubber oil seal This kind of oil seal has no skeleton, some even have no spring, and the whole is molded by rubber. It is characterized by poor stiffness and is prone to plastic deformation. But it can be used with cutouts, which is the only form for parts that cannot be installed from the shaft end but must be sealed with oil [Fig. (d)].

(3) Oil seals for vehicles

Rotary shaft lip seals are customarily called oil seals. According to the structure, oil seals are divided into inner framework oil seals, including B type (without auxiliary lip) and FB type (with auxiliary lip) oil seals; exposed skeleton oil seals, including W type (without auxiliary lip) and FB type (with auxiliary lip); assembly Type oil seal, including type B (without auxiliary lip) and type FZ (with auxiliary lip). The structure of the oil seal has a great influence on its performance. In the 1970s and 1980s, through in-depth research on the oil seal structure (section shape and size), a series of detection devices related to structural design (such as oil seal radial force, lip contact width, friction torsion, lip temperature) were developed. liter and life test instrument or bench), laying the foundation for the design of oil seal structure .The design principles of oil seal structural parameters (shape and size of waist, matching size of lip and spring groove, interference amount, shape and size of auxiliary lip, etc.) of oil seal are basically determined. These principles have been applied in oil seal design standards GB 987711, GB 987712 and GB 987713.

Compared with the inner frame oil seal, the exposed frame oil seal has a higher installation coaxiality and better sealing effect, but it is more difficult to control the processing technology and dimensional accuracy of the mold and product grinding. Foreign automobile oil seals are basically exposed skeleton oil seals, while domestic automobile oil seals are mainly inner skeleton oil seals. In the early 1980s, the former Ministry of Chemical Industry organized a large-scale research on the development of exposed skeleton oil seals, including the formula and structure ratio of the exposed skeleton oil seal, the bonding of the rubber and the skeleton, the antirust treatment of the exposed skeleton, the spring and mold design and Processing, product grinding technology, etc. have been systematically studied, but due to various reasons, my country has not yet achieved large-scale production of exposed skeleton oil seals.



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