Rotating shaft lip seals, commonly known as oil seals, are installed in the rotating bearing seat and produce relative motion with the rotating shaft. The metal frame plays a supporting role, and the spring applies radial preload to the sealing lip to prevent the leakage of lubricating oil and the intrusion of external dirt.
TC/SC/TB/SB oil seals are composed of metal skeletons, springs and rubber bodies. The metal skeleton plays a supporting role, and the spring applies radial force to the sealing lip. TC/TB are equipped with dust-proof auxiliary lips, which are suitable for occasions where there is sealing medium on one side and dust on the other side. TB/SB is a metal outer circle, which makes the oil seal more firm and precise in the cavity, but the sealing ability of the outer circle for low viscosity and gas medium is limited. It is recommended to apply sealant on the outer circle during installation.
The function of RCTCV double-lip high-pressure skeleton oil seal is generally to isolate the parts that need lubrication in the transmission parts from the output parts to prevent lubricating oil leakage.
The skeleton oil seal structure consists of three parts: sealing body, reinforcing skeleton and self-tightening coil spring. The sealing body is divided into bottom, waist, cutting edge and sealing lip according to different parts. Usually, the inner diameter of the skeleton oil seal in the free state is smaller than the shaft diameter, and has a certain "interference amount". Therefore, when the oil seal is inserted into the oil seal seat and the shaft, the elastic force of the oil seal edge and the contraction force of the self-tightening coil spring produce a radial clamping force on the shaft, thereby obtaining the best sealing effect.
The RCTCN double-lip high-pressure oil seal has an overall pressure-resistant skeleton design, with small lip deformation, and is used to seal rotating shafts in pressure-exposed situations.
Product features and applications:
Rotating shaft lip seals installation structure and requirements
1. Shaft material: Carbon steel and stainless steel are commonly used. Chrome plating is used at high speed, HRC40-45.
2. Design of rotating shaft and groove: The surface of the shaft is smooth and burrs are removed. Spiral processing marks will produce a pumping effect and cause leakage. It is recommended to grind the oil seal installation part with a surface roughness of Ra0.1-0.5um. And it becomes smoother as the speed increases.
For the needs of installation and disassembly, the shaft and groove must be chamfered or rounded. As shown in Figures 1 and 2.
Figure 1 Groove chamfer design
| Sealing height b | b1(0.85xb) mm | b2(b+0.3) mm | r max. |
| 7 | 5.95 | 7.3 | 0.5 |
| 8 | 6.80 | 8.3 | 0.5 |
| 10 | 8.50 | 10.3 | 0.5 |
| 12 | 10.30 | 12.3 | 0.7 |
| 15 | 12.75 | 15.3 | 0.7 |
| 20 | 17.00 | 20.3 | 0.7 |
Figure 2 Chamfer design of the rotating shaft
| d | d3 | R |
|
d | d3 | R |
| <10 | d-1.5 | 2 | 70~95 | d-4.5 | 5 | |
| 10~20 | d-2.0 | 2 | 95~130 | d-5.5 | 6 | |
| 20~30 | d-2.5 | 3 | 130~240 | d-7.0 | 8 | |
| 30~40 | d-3.0 | 3 | 240~500 | d-11.0 | 12 | |
| 40~50 | d-3.5 | 4 | 500~800 | d-14.0 | 14 | |
| 50~70 | d-4.0 | 4 | 800~1250 | d-18.0 | 16 |
There are dozens of factors that affect the sealing effect of rotating shaft lip seals. In addition to the material and structure of the oil seal itself, other factors such as medium, temperature, pressure, lubrication, speed, roughness, etc. also directly affect the sealing effect, and these factors often interact with each other. The following chart is for user reference only.
Installation of rotating shaft lip seals: Careful installation is a prerequisite for the oil seal to work well.
| Installation diagram (cavity installation) | ||
| Correct installation method | Applicable working conditions | Wrong installation method |
 |
It is only applicable when the end face of the oil seal is flush with the end face of the cavity. When the pressing device moves quickly, the oil seal should be placed straight, otherwise it may be pressed off. |
|
 |
It is suitable for the situation that the end face of the oil seal is lower than the end face of the cavity. When the pressing device moves faster, the oil seal can also be well positioned. However, this type of structural fixture itself has no radial positioning, so the axial verticality of the flat plate and the pressure shaft of the pressing device must reach a certain accuracy. |
 |
 |
Applicable to the situation where the end face of the oil seal is lower than the end face of the cavity. When the pressing device moves quickly, it is necessary to ensure that the oil seal is placed correctly, otherwise it may be pressed off. |
 |
 |
It is only suitable for maintenance or simple installation conditions without pressure equipment. Since the installation process cannot be absolutely uniformly pressed, various installation problems will inevitably occur. It is mainly to prevent radial deviation during installation, which may cause deformation of the oil seal, or rubber extrusion damage to the oil seal mating part (outer circle) caused by pauses during installation. Therefore, this installation method is generally not recommended. |
 |
TC/SC/TB/SB oil seals:
| Cross-sectional shape | Model | Application | Pressure | Temperature | Speed | Medium | Material |
 |
TC | Sealing, dustproof | 0.03MPa | -30~+160 | 20m/s | Lubricating oil, grease | NBR/FKM+Carbon Steel |
 |
SC | Sealing | |||||
 |
TB | Sealing, dustproof | -30~+100 | 25m/s | Water, oil, grease | NBR+Carbon Steel | |
 |
SB | Sealing |
Address
No.1 Ruichen Road, Dongliuting Industrial Park, Chengyang District, Qingdao City, Shandong Province, China
Tel
