Oct. 14, 1952 T. E. NELSON 2,613,960
OIL SEAL Filed Dec. 1, 1949 BY 574M KITTORNE).
Patented Oct. 14, 1952 UNITED STATES PATENT o ncE OIL SEAL Thomas Edward Nelson, Pontiac, Mich.
Application December 1, 1949, Serial No. 130,484
1 Claim. 1
This invention relates to oil seals, the object being to provide a new and improved oil seal mounted to rotate with a rotatable member.
These and other features and objects of the invention are hereinafter more fully described and claimed and the preferred form of the invention is shown in the accompanying drawing in which Fig. 1 is a sectional view of the sealing ring in association with a shaft in a housing.
Fig. 2 shows a section of the sealing ring and the retainer therefor.
As shown in Fig. 1 the shaft is indicated at I and has an end 2 of less diameter than the body portion of the shaft thereby providing a shoulder 3. On the portion 2 of the shaft is positioned a sealing device including a ring 4 of a wave type in a chambered ring 5 which has a flange B on the portion 2 of the shaft and a peripheral portion 1 which is shaped to provide anannular recess 8. The recess is of greatest width at its outer periphery to receive a rubber ring 9 which has a central aperture in which the flange 6 is positioned. The ring 9 also has an inwardly extending flange II and on the said flange is a metal washer Ila which is maintained in place by the ring 4. The ring 9 has a portion I2 normally outwardly inclined relative to the plane of the ring as shown in Fig. 2.
By such arrangement the end [3 of said por tion [2 is maintained in pressure contact with the inner face of the plate I 4 thereby sealing the chamber [5 in which the bearing members I 6 are positioned. The bearing members iii are here shown as being of the roller type and each normally lie in an aperture provided therefor in the flange of a retainer II.
On the end portion 2 of the shaft is a chambered ring 5 which has a flange 6 positioned on the end portion 2 of the shaft I. The said ring has a flange 6 positioned on the portion 2 of the shaft and the periphery of the ring is formed to provide an annular recess 8 the opposite sides of which are inwardly inclined. The rubber ring 9 is shaped at its periphery to engage in the recess 8 and has an inwardly extending flange II on which is a metal washer Ila. The wave ring 4 has portions engaging the washer H0, and portions engaging the inner surface 5a of the chambered ring 5 in sequence.
The flange ll of the ring 5 normally lies at an angle greater than a right angle to the axis of the shaft and is positioned between the ring IS on the shaft and an outer ring IS. The flange I1 is apertured to receive the bearing members 10 which lie between the inner and outer rings [8 and I9 and preferably the outer inclined face 20 of the inner ring I8 is recessed as indicated at 2 2| whereby displacement of the rollers longitudinally of the shaft is prevented.
A slightly different arrangement is shown in Fig. 2 in that the flange 6a extends inwardly instead of outwardly as shown at 6 in Fig. 1 and, while I have shown a Wave ring for maintaining the sealing ring in pressure contact with the closure plate M, other means may be employed for such purpose within the spirit and scope of the invention as herein disclosed and claimed.
By the described character and relationship of parts leakage of oil from the chamber I5 is prevented.
Having thus briefly described my invention, its utility and mode of operation, what I claim and desire to secure by Letters Patent of the United States is:
An oil seal for use in conjunction with a shaft rotatably supported within a housing having an end wall extending in a plane transverse to the 9 axis of said shaft, comprising a ring-like retainer having an axially elongated annular hub secured on the shaft and a peripheral portion defining an annular recess opening radially inward with the throat thereof of reduced width, a resilient sealing element of ring-like form peripherally secured within said retainer recess arranged at right angles to the shaft axis and centrally apertured to surround said hub in spaced relation for longitudinal flexing movement independently thereof, said sealing element having an axially directed central annular flange on one side thereof with its outer surface portions normally inclined outwardly towards its periphery, said flange being annularly undercut at its maximum diameter at said sealing element to facilitate flexing of the outer inclined surface of said flange for surface registry with said end wall and ,an inwardly directed central annular flange upon its other side adjacent its aperture, a washer upon said latter flange, and a. wave spring positioned between and oppositely engaging against said retainer and said washer for maintaining the flange on said one side in wiping surfaceconw tact with the end wall of said housing.
THOMAS EDWARD NELSON.
REFERENCES CITED The following references are of record in the flle of this patent:
UNITED STATES PATENTS Number Name Date 2,080,669 Nelson May 18, 1937 2,233,624 Magnesen Mar. 4, 1941 2,264,739 Boden Dec. 2, 1941 2,265,951 Miner Dec. 9, 1941 2,373,443 Armington Apr. 10, 1945 2,486,088 Yaros Oct. 25, 1949
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.
Simmerring
[
edit
]
A commonly used expression is "Simmerring". This product name and Simmer-Ring are trademarks of Freudenberg Sealing Technologies.
Simmerring is derived from the name of the developer, the Austrian engineer Walther Simmer, who worked for Freudenberg. The first development 1929 in Kufstein Tirol Austria, consisted of leather and metal.
Standards
[
edit
]
Standards and other documents relating to radial shaft seals
See also
[
edit
]
References
[
edit
]