Oil seal performance is affected by not only the type and material of the selected oil seal, but also a variety of other factors, such as operating conditions, total eccentricity, rotational speed, the substance to be sealed, and lubrication conditions.
Figure 9 shows items relating to oil seal characteristics.- The dimensions 35x50x8 denote the primary characteristics of this particular oil seal. The first two numbers, 35 and 50, represent the outer diameter and the inner diameter respectively, specifying the sizes at which it can effectively function. The final number, 8, indicates the thickness or the cross-sectional dimension of the seal. This design allows for a snug fit in various applications, creating a robust barrier against fluid escape and foreign particle intrusion.
- One common type of oil seal is the lip seal, also known as radial shaft seal. This type of seal consists of a flexible lip that fits tightly against the shaft, preventing the oil from leaking out. Lip seals are typically made from rubber or elastomeric materials, which provide a good seal and resistance to oil and other fluids. They are commonly used in engines, gearboxes, and hydraulic systems.
Shaft Speed - Considering the speed that the shaft will be moving, the runout, the housing bore and the type of oil being sealed is vital to making sure you select an oil seal that will not suffer from abrasions or spiralling.
Material Code ISO 1629
There are a wide range of oil seals to select from for any number of uses, so this guide will break down the most common seals to help you choose the right one for whatever piece of machinery you are working on.
b) The area where the oil seal is seated is to be plunge ground in order to prevent wear grooves that normally tend to wear out the lip of the oil seal at a faster rate.
These seals are more commonly used in pumps, motors both electric & hydraulic, gearboxes & occasionally dirt wipers in hydraulic cylinders. They help protect shafts and bearings from dirt and harmful contaminants entering the internals of the application that they are fitted to, as well as prevent any leaks of lubricant.
The spring shown in the figure is known as a garter spring, and it maintains tension on the sealing lip of the seal. Garter springs are closed coil springs used in the form of a ring, the ends of which are connected together as shown in Figure 2.10.
How does an Oil Seal Work
Shaft and Bore Tolerance
The advantages are low friction and minimum power consumption, the possible use even in case of insufficient lubrication, operating range of -130º c to +200º c and much more: high chemical resistance and a low breakaway torque after standstill. Further, the PTFE, when heated, can” remember” its original form and return to it (phenomenon known as” plastic memory effect”).Therefore, this kind of seal do not need the old school metallic spring.
APPLICATIONS OF OIL SEALS
Front pump input seal
Oil seals, also known as rotary shaft seals or lip seals, are a specific type of gasket designed to prevent the leakage of oil or other fluids in rotating shafts.