Radial shaft seals, also known as lip seals, are used to seal rotary elements, such as a shaft or rotating bore. Common examples include strut seals, hydraulic pump seals, axle seals, power steering seals, and valve stem seals. Early radial shaft seals utilized rawhide as the sealing element, and many present-day elastomeric seal companies were once tanneries. The advent of modern elastomers replaced rawhide, industry also added a garter spring, which helps the sealing lip compensate for lip wear and elastomer material changes.
The seal construction consists of a sprung main sealing lip which has a line contact with the shaft. The line contact is formed by two angles, with the air side angle usually less than the oil side angle. Depending on the seal type these two angles are varied to create a pressure distribution at the seal contact line which has a steeper slope on the oil side of the seal. The shallower the slope on the oil side of the seal, the wetter the seal will run. The spring is positioned such that axially the centerline of the spring is biased to the air side of the lip contact line. These seals can be designed with a wide range of lip configurations to optimize lubrication retention and contaminant exclusion.[1]
In order to exclude contaminants numerous types of dust lips or exclusionary lips may be used. Common elastomers include FKM, ACM, NBR, HNBR, and AEM. In order to resist wear, the compounds' durometer (hardness) is typically 70 to 85 Shore A (between that of an automobile tire and a soft inline-skate wheel).
A different seal design for similar applications is a rotating face seal.
^"GFS Rotary Seals". Gallagher Seals. Retrieved 5 August 2021.
Radialshaftseals, also known as lip seals, are used to seal rotary elements, such as a shaft or rotating bore. Common examples include strut seals, hydraulic...
magnetic coupling can transmit force into a hermetically sealed enclosure without using a radialshaftseal, which may leak. Rotational frequency, n Measured...
inner face of the seal would cause the seal to become more stable. In addition, axial misalignment would also cause the horizontal shaft to shift in the...
the bearings, housings, and only a short section of the shaft itself that also carries all radial loads. The full-floating design is typically used in most...
angles to the shaft (radially); an example is the centrifugal fan, which is commonly used to implement a vacuum cleaner. Another type of radial-flow pump...
couplings makes assembly easier. These couplings also compensate shaft displacements (radial, axial and angular) and the torque is transmitted in shear. Depending...
and is used in oil seals, shaftseals, belt-driven motors, and electrical connectors. Compression garter springs exert outward radial forces, while extension...
parts include the radial bearings (bushings) distributed along the length of the shaft, providing radial support to the pump shaft. An optional thrust...
agitator Vertically mounted agitator Mechanical seal Packing sealRadial Flow Impeller. Figure 1 shows a radial flow created by the impellers wherein the circulation...
possible are: Journal (friction, radial or rotary) bearing: This is the most common type of plain bearing; it is simply a shaft rotating in a hole. In locomotive...
apex and side seal materials was determined experimentally, to obtain the best duration of both seals and housing cover. For the shaft, steel alloys with...
an external motor driving a shaft that passes through the body of the compressor and rely on rotary seals around the shaft to retain the internal pressure...
The slewing drive is a gearbox that can safely hold radial and axial loads without brakes, as well as transmit a torque for rotating. The rotation can...
include bearings, couplings, impeller locking device, fan discharge casing, shaftseal plates etc. The fan drive determines the speed of the fan wheel (impeller)...
stroke power presses, to control the stroke length of a three cylinder radial engine. Later, the swashplate engine with an adjustable swashplate angle...
patent was for a compound radial engine with an exhaust-driven axial flow turbine and compressor mounted on a common shaft. The first prototype was finished...
fixed radius crank on a single shaft. However, the scroll expander engine could not overcome the machining hurdles of radial compliance inherent to achieving...
the kinetic energy of the flowing water. The design combines features of radial and axial turbines. The inlet is a scroll-shaped tube that wraps around...
bearings are outside the sump. This style of pump uses no stuffing box to seal the shaft but instead utilizes a "throttle bushing". A common application for...
pump is similar to that of a radial piston-type pump, but instead of a piston it has a machined plunger that has no seals. When the plunger is at top dead...
Global Information