Energy saving seal with vacuum induced counter-balance and rocking feature

Information

  • Patent Grant
  • 9695937
  • Patent Number
    9,695,937
  • Date Filed
    Tuesday, February 4, 2014
    10 years ago
  • Date Issued
    Tuesday, July 4, 2017
    7 years ago
Abstract
A seal includes an annular mounting portion having a bellows portion extending axially and radially inward from the mounting portion. An axial leg extends axially from the bellows portion. A lay down sealing lip extends radially inward and axially from an end of the axial leg. A dust lip extends from the end of the axial leg in a direction opposite the lay down sealing lip. When the oil side is under negative pressure and when the lay down sealing lip begins to lift radially off the shaft there is a counterbalance force applied to the axial leg through the bellows geometry which maintains the lay down sealing lip in contact with the shaft. In addition, the seal is designed to be flexible enough that the oil side vacuum “rocks” the seal bringing the dust lip into contact with the shaft and blocking airflow.
Description
FIELD

The present disclosure relates to a dynamic shaft seal and more particularly to an energy-saving seal with vacuum induced counter-balancing and rocking feature.


BACKGROUND

This section provides background information related to the present disclosure which is not necessarily prior art.


Currently, lay down lip seals offering low power consumption due to low friction are recommended for use in engines with relatively low levels of crankcase pressure. The seal's radial force is sufficient to keep the lip in contact with a shaft for desired sealing performance yet is low enough to cause minimum friction. However, in certain forced induction engines such as turbocharged and supercharged engines, the crankcase pressure becomes negative and exceeds the capacity of the lay down lip seal to remain in contact with the shaft. This leads to the generation of an air flow from the environment to the crankcase. Interaction of this air flow with the sealing lip, oil and the shaft produces noise/squeal which is unacceptable to customers. Accordingly, it is desirable to provide a low friction seal that maintains seal contact in response to negative pressures on the oil side of the seal.


SUMMARY

This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.


The present disclosure is directed to a seal for sealing between a bore and a shaft for separating an oil side from an air side of the seal. The seal includes an annular mounting portion having a bellows portion extending axially and radially inward from the mounting portion. An axial leg extends axially from the bellows portion toward the air side. A lay down sealing lip extends radially inward and axially toward the oil side from an end of the axial leg. A dust lip extends from the end of the axial leg in a direction opposite the lay down sealing lip. When the system is not under negative pressure, the lay down sealing lip sealingly engages the shaft and the dust lip is radially spaced from the shaft. When the oil side is under negative pressure and when the lay down sealing lip begins to lift radially off the shaft there is a counterbalance force applied to the axial leg through the bellows geometry which maintains the lay down sealing lip in contact with the shaft. In addition, the seal is designed to be flexible enough that the oil side vacuum “rocks” the seal bringing the dust lip into contact with the shaft and blocking airflow. The dust lip is designed to come into contact with the shaft before there is complete sealing lip lift off.


Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.





DRAWINGS

The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.



FIG. 1 is a cross-sectional view of the energy-saving seal shown in a normal operating condition according to the principles of the present disclosure; and



FIG. 2 is a cross-sectional view of the energy-saving seal of FIG. 1 shown under negative pressure from the oil side.





Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.


DETAILED DESCRIPTION

Example embodiments will now be described more fully with reference to the accompanying drawings.


Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.


The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.


When an element or layer is referred to as being “on,” “engaged to,” “connected to,” or “coupled to” another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to,” “directly connected to,” or “directly coupled to” another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.


Spatially relative terms, such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.


With reference to FIG. 1, the energy saving seal 10 according to the principles of the present disclosure will now be described. The seal 10 is designed for sealing between a bore 12 in an outer member 14 and a shaft 16 and for separating an oil side “O” from an air side “A”, as illustrated in FIG. 1. The seal 10 includes an annular mounting portion 20 that can be attached to a metal insert 22 or otherwise engaged with the bore 12 of the outer member 14. The annular mounting portion 20 and optional metal insert 22 can each take on many forms and the exemplary mounting portion 20 and a metal insert 22 as shown, are merely shown for illustrative purposes.


A bellows portion 24 extends axially and radially inward from the mounting portion 22. The bellows portion 24 extends axially and radially so that the bellows portion 24 can flex radially inwardly. An axial leg portion 26 extends axially from the bellows portion 24 toward the air side A. The axial leg 26 terminates at a pivot portion 28 from which a lay down sealing lip 30 extends radially inward and axially toward the oil side O. A dust lip 32 extends radially inward and axially from the pivot portion 28 in a direction opposite the lay down sealing lip 30 toward the air side A. The pivot portion 28 may define a region of increased thickness relative to the axial leg portion 26, the lay down sealing lip 30 and the dust lip 32 to define a region that pivots relative to the axial leg portion 26 rather than being easily deformed.


The lay down sealing lip 30 can include pumping grooves 34 on an inner surface thereof. Under operating conditions with little or no negative pressure on the oil side, the lay down sealing lip 30 engages the shaft 16 while the dust lip 32 is spaced from the shaft 16, as shown in FIG. 1. The lay down sealing lip 30 is engaged with and provides little friction against the shaft 16. Under operating conditions with negative pressure on the oil side O, the negative pressure tends to cause the lay down sealing lip 30 to lift off of the shaft 16, there is a counterbalance force that is applied to the axial leg 26 through the bellows geometry 24, which maintains the lay down sealing lip 30 in contact with the shaft 16. In addition, the seal is designed to allow the whole seal to rock about the pivot portion 28, as illustrated by the arrow in FIG. 2, when vacuum is applied, bringing the dust lip 32 into contact with the shaft 16 and to prevent airflow from developing past the seal 10.


The seal material composition can include plastic, rubber, or any of a wide variety of known elastomers, such as PTFE, and TPE (thermoplastic elastomers) and TPV (thermoplastic volcanizates).


The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.

Claims
  • 1. A seal for sealing between a bore and a shaft for separating an oil side from an air side of the seal, comprising: a mounting portion;a bellows having a first portion extending axially from the mounting portion in a first axial direction toward the oil side and the first portion extending radially inward from the mounting portion and the bellows having a second portion extending axially from the first portion toward the air side and the second portion extending radially inward from the first portion;an axial leg extending axially from the bellows portion in a second direction opposite to the first direction toward the air side, the axial leg extending from the second portion at a location on a first axial side of the mounting portion, a terminal end of the axial leg is connected to a pivot portion defined by a region of increased thickness relative to a thickness of the axial leg, the pivot portion being disposed at a location on a second axial side of the mounting portion opposite from the first axial side;a lay down sealing lip extending radially inward and axially in the first direction toward the oil side from the pivot portion; anda dust lip extending from the pivot portion at the end of the axial leg in the second direction opposite the lay down sealing lip, wherein the region of increased thickness defining the pivot portion has an increased thickness relative to a thickness of both the dust lip and the lay down sealing lip and the pivot portion is disposed axially between the lay down sealing lip and the dust lip, wherein during operation without negative pressure on the oil side, the lay down sealing lip is engaged with the shaft and the dust lip is radially spaced from the shaft and when said oil side is under negative pressure that tends to cause the lay down sealing lip to begin to lift away from the shaft, the end of the axial leg flexes to engage the dust lip with the shaft.
  • 2. The seal according to claim 1, wherein said lay down sealing lip includes grooves therein.
US Referenced Citations (144)
Number Name Date Kind
2482029 Reynolds Sep 1949 A
2635907 Heimbuch Apr 1953 A
2697623 Mosher Dec 1954 A
2731284 Chambers, Jr. et al. Jan 1956 A
2736583 Marvin Feb 1956 A
2736585 Riesing Feb 1956 A
2736586 Riesing Feb 1956 A
2743950 Helfrecht et al. May 1956 A
2758853 Beck Aug 1956 A
2797944 Riesing Jul 1957 A
3005648 Christensen Oct 1961 A
3049356 Talamonti Aug 1962 A
3356376 Bradfute et al. Dec 1967 A
3477730 Kare et al. Nov 1969 A
3554566 Bechtrold et al. Jan 1971 A
3572734 Holt Mar 1971 A
3612546 Otto et al. Oct 1971 A
3623738 MacDonnell Nov 1971 A
3785660 Bush Jan 1974 A
3822890 Bourgeois Jul 1974 A
3827703 Brink Aug 1974 A
3921987 Johnston Nov 1975 A
3921990 Johnston Nov 1975 A
3941396 Bailey et al. Mar 1976 A
4021049 Phelps et al. May 1977 A
4037849 Thumm Jul 1977 A
4102538 Bertin Jul 1978 A
4106781 Benjamin et al. Aug 1978 A
4126320 Pendleton Nov 1978 A
4132421 Corsi et al. Jan 1979 A
4190258 Arai et al. Feb 1980 A
4208060 St. Laurent, Jr. Jun 1980 A
4226428 Paptzun Oct 1980 A
4229010 St. Laurent, Jr. Oct 1980 A
4270762 Johnston Jun 1981 A
4274641 Cather, Jr. Jun 1981 A
4300778 Gagne Nov 1981 A
4344631 Winn Aug 1982 A
4348031 Johnston Sep 1982 A
4360208 Hill et al. Nov 1982 A
4413829 Pietsch Nov 1983 A
4449717 Kitawaki et al. May 1984 A
4474484 MacInnes et al. Oct 1984 A
4519616 Johnston May 1985 A
4531747 Miura et al. Jul 1985 A
4531748 Jackowski Jul 1985 A
4550920 Matsushima Nov 1985 A
4553763 Ehrmann Nov 1985 A
4585236 Simmons et al. Apr 1986 A
4588195 Antonini et al. May 1986 A
4611931 Brandenstein et al. Sep 1986 A
4630834 Muller et al. Dec 1986 A
4635947 Hatayama Jan 1987 A
4643436 Jackowski Feb 1987 A
4650196 Bucher et al. Mar 1987 A
4750748 Visser Jun 1988 A
4805919 Wiblyi et al. Feb 1989 A
4815749 Johnston Mar 1989 A
4844484 Antonini Jul 1989 A
4940248 Kilthau et al. Jul 1990 A
4986553 Preston et al. Jan 1991 A
4995621 Devouassoux et al. Feb 1991 A
5004248 Messenger et al. Apr 1991 A
5085444 Murakami et al. Feb 1992 A
5137285 Pick Aug 1992 A
5139275 Ehrmann Aug 1992 A
5167419 Robertson Dec 1992 A
5183269 Black et al. Feb 1993 A
5190299 Johnston Mar 1993 A
5201528 Upper Apr 1993 A
5244215 Cather, Jr. et al. Sep 1993 A
5292199 Hosbach et al. Mar 1994 A
5348312 Johnston Sep 1994 A
5348313 Pawlakowitsch et al. Sep 1994 A
5370404 Klein et al. Dec 1994 A
5398942 Duckwall et al. Mar 1995 A
5427387 Johnston Jun 1995 A
5462287 Hering et al. Oct 1995 A
5462288 Hering et al. Oct 1995 A
5476270 vom Schwemm et al. Dec 1995 A
5501469 Ducugnon et al. Mar 1996 A
5509667 Klein et al. Apr 1996 A
5556112 Brandt Sep 1996 A
5624290 Von Bergen et al. Apr 1997 A
5668426 Lamert et al. Sep 1997 A
5692757 Straub Dec 1997 A
5711534 Bengoa et al. Jan 1998 A
5791658 Johnston Aug 1998 A
5842828 Ozawa et al. Dec 1998 A
5909880 Waskiewicz Jun 1999 A
5921555 Johnston Jul 1999 A
5957461 Ulrich Sep 1999 A
5967527 Fabro et al. Oct 1999 A
6019229 Rao Feb 2000 A
6279914 Yamanaka et al. Aug 2001 B1
6298955 Frost Oct 2001 B1
6336638 Guth et al. Jan 2002 B1
6357757 Hibbler et al. Mar 2002 B1
6409177 Johnston Jun 2002 B1
6428013 Johnston et al. Aug 2002 B1
6481896 Ohtsuki et al. Nov 2002 B1
6513810 Pataille Feb 2003 B1
6513812 Yang et al. Feb 2003 B1
6520507 Pataille et al. Feb 2003 B2
6601855 Clark Aug 2003 B1
6688603 vom Schemm Feb 2004 B2
6702293 Endo et al. Mar 2004 B2
6860486 Hacker et al. Mar 2005 B2
6921080 Johnen Jul 2005 B2
6921082 Lutaud Jul 2005 B2
6945537 Guillerme et al. Sep 2005 B2
7004471 Bryde et al. Feb 2006 B2
7134669 Uhrner Nov 2006 B2
7172201 Uhrner Feb 2007 B2
7344140 Ikeda Mar 2008 B2
7513690 Yamamoto et al. Apr 2009 B2
7770897 Berdichevsky Aug 2010 B2
7854432 Berdichevsky Dec 2010 B2
7854433 Berdichevsky Dec 2010 B2
8011673 Berdichevsky Sep 2011 B2
8066287 Berdichevsky Nov 2011 B2
20020117810 Schemm Aug 2002 A1
20020158421 Johnston Oct 2002 A1
20030006563 Cater et al. Jan 2003 A1
20030085527 Hacker et al. May 2003 A1
20030189293 Johnen Oct 2003 A1
20030230850 Bruyere et al. Dec 2003 A1
20030230852 Bengoa et al. Dec 2003 A1
20030230855 Malone et al. Dec 2003 A1
20040160014 Uhrner Aug 2004 A1
20050098959 Uhrner May 2005 A1
20050104302 Matsui et al. May 2005 A1
20050140097 Kosty et al. Jun 2005 A1
20050167928 Park et al. Aug 2005 A1
20060022414 Balsells Feb 2006 A1
20060033291 Tones et al. Feb 2006 A1
20060125192 Johnston Jun 2006 A1
20060290070 Park Dec 2006 A1
20070057472 Hatch Mar 2007 A1
20080143055 Dobbs Jun 2008 A1
20080157481 Berdichevsky Jul 2008 A1
20080217865 Sedlar Sep 2008 A1
20100244390 Berdichevsky Sep 2010 A1
20110241296 Ting Oct 2011 A1
Related Publications (1)
Number Date Country
20150219218 A1 Aug 2015 US