The invention relates to a seal for sealing shafts relative to liquid media, such as propeller shafts, impeller shafts, rudder shafts of ships, consisting of a clamp-in element in allocated housing-fixed support rings as an installation space with an adjoining intermediate part as a membrane and an angled element facing toward the shaft with formation of a seal lip for contact on the shaft, whereby a receiving groove or trough with a spring is arranged in the angled element above the seal lip.
Seals of this type are known in various different embodiments for use for ships. An embodiment according to the generic field is known according to the DE 41 41 999 C2. In this regard it has been found that the adaptability or fitting capability of the seal edge geometry and adjustment of the angled region does not exhibit optimal relationships or conditions under increased pressure loading.
It is an object of an embodiment of the invention to enable a good adjustment of the seal and therewith to improve the adjustment of the seal to the prevailing conditions or relationships.
The solution of this object is achieved according to an embodiment of the invention in which the receiving groove is embodied as a spring pocket with a free space for the spring in the pressureless or pressure-free condition.
Hereby it is possible to give the spring a free space for the adjustment of the seal.
In order to enable an improvement of a seal edge geometry under pressure loading, it is suggested that the membrane is adjustable by changing its tilt angle under pressure loading until reaching a limit pressure for contacting on an allocated housing wall, such as an extended support ring, and an enlarged bottom side in contact angle is adjustable in the angled region with the seal lip.
Hereby, relatively good relationships or conditions for forming contact surfaces with advantageous angle relationships at high pressing force are adjustable or settable by a change of the contact angle under pressure loading.
It is further suggested that the free space comprises an axially directed width of 5 to 30% of a spring diameter.
For securing the inserted spring it is suggested that an axially protruding or overhanging nose as a retaining element with an undercut or recess radially thereunder for receiving and retaining the inserted spring is arranged on the membrane above the spring pocket.
For forming an advantageous contact surface of the seal it is suggested that the seal lip for contacting on the shaft is formed by a rounded end region of the angled element.
Further it is suggested that at least the region of the seal lip is formed of a more wear resistant elastomer relative to the material of the further part of the seal.
An example embodiment of the invention is schematically illustrated in the drawing. It is shown by:
The illustrated seal 1 is formed of a rubber elastic material, such as an elastomer, whereby at least the region of a seal lip 2 is formed of a more wear resistant elastomer than the material of the further part of the seal 1.
The seal 1 consists of an upper clamp-in element or mounting part 3, which is clamped into housing-fixed metallic support rings 4, 5 in a liquid-tight known manner. An intermediate part 6 as a membrane adjoins the clamp-in part 3 of the seal 1, and the intermediate part 6 is embodied at an angle psi as a tilt angle relative to a horizontal (shaft 7).
The intermediate part 6 extends radially inwardly toward the shaft 7 to a bottom side 17 of the seal 1 that faces toward the shaft 7, where the intermediate part 6 is further connected with an angled region or base part 8 of the seal 1 that extends from the intermediate part 6 axially forwardly and radially outwardly toward the shaft 7 that is to be sealed. With its end region 9, the base part 8 forms the seal lip 2, which lies in contact on the shaft 7 with a bottom side contact angle beta between the shaft 7 and the bottom side 17 of the seal 1. In this embodiment, the seal lip 2 is formed by a rounded end region 9 of the angled region or base part 8 of the seal 1.
For forming or developing a contact pressure of the seal lip 2 on the shaft 7, an allocated spring 10 is provided in addition to the elastic return element of the angled region 8 of the seal 1. In that regard, the spring 10 with a diameter D is received in a receiving groove or trough 11 as a spring pocket and thereby has a formed free space 12 with a free space depth or width t in the axial direction, which enables a flexible adjustment of the angled region 8 of the seal 1. For securing the spring 10, an axially protruding or overhanging nose 13 as a retaining element with an undercut 20 or recess radially thereunder is arranged on the intermediate part 6 of the membrane radially outwardly above the receiving groove 11 so that the spring 10 is retained radially inwardly under the nose 13 forming the undercut 20. The free space depth or width t preferably amounts to 15% of the spring diameter D.
Through this arrangement it is possible to increase or enlarge the contact angle beta of the bottom side 17 in the axial direction of the seal lip 2 relative to the shaft 7 under pressure loading, and therewith to correspondingly flexibly adjust it, and to reduce a seal surface so that an advantageous contact width is established, as shown in the transition from
For limiting the tilt angle psi of the seal 1 upon reaching a position as shown in
Number | Date | Country | Kind |
---|---|---|---|
10 2011 018 584 | Apr 2011 | DE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
---|---|---|---|---|
PCT/DE2012/000228 | 2/29/2012 | WO | 00 | 7/30/2013 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2012/139541 | 10/18/2012 | WO | A |
Number | Name | Date | Kind |
---|---|---|---|
2482029 | Reynolds | Sep 1949 | A |
2760802 | Haley | Aug 1956 | A |
3207521 | Dega | Sep 1965 | A |
3210086 | Hudson et al. | Oct 1965 | A |
3214180 | Hudson et al. | Oct 1965 | A |
3773336 | Walter | Nov 1973 | A |
3788100 | Pitner | Jan 1974 | A |
3902726 | Hisada | Sep 1975 | A |
3920250 | Eklund | Nov 1975 | A |
3968971 | Mariaulle | Jul 1976 | A |
4344631 | Winn | Aug 1982 | A |
4383691 | Potter | May 1983 | A |
4470605 | Deuring | Sep 1984 | A |
4750747 | Holzer | Jun 1988 | A |
4781102 | Scerbo et al. | Nov 1988 | A |
4964647 | Stephan | Oct 1990 | A |
5082294 | Toth et al. | Jan 1992 | A |
5219434 | Von Bergen et al. | Jun 1993 | A |
5269539 | Martin | Dec 1993 | A |
5308269 | von Bergen et al. | May 1994 | A |
5411273 | Pietsch | May 1995 | A |
5643026 | Pietsch et al. | Jul 1997 | A |
5820132 | Marnot | Oct 1998 | A |
5845910 | Sabo | Dec 1998 | A |
6241396 | Shimomura et al. | Jun 2001 | B1 |
6264205 | Balsells | Jul 2001 | B1 |
6367811 | Hosokawa et al. | Apr 2002 | B1 |
6676132 | Takebayashi | Jan 2004 | B1 |
6979002 | Ramsay | Dec 2005 | B2 |
8328201 | Epshetsky | Dec 2012 | B2 |
8828178 | Yamamoto et al. | Sep 2014 | B2 |
20040090015 | Weiss | May 2004 | A1 |
20040169339 | Bock | Sep 2004 | A1 |
20050184468 | Aoshiba et al. | Aug 2005 | A1 |
20060022414 | Balsells | Feb 2006 | A1 |
20070222161 | Voydatch et al. | Sep 2007 | A1 |
20070278748 | Matsui et al. | Dec 2007 | A1 |
20070290451 | Yager | Dec 2007 | A1 |
20090146379 | Foster | Jun 2009 | A1 |
20100237566 | Balsells | Sep 2010 | A1 |
20120099986 | Hisada | Apr 2012 | A1 |
20120235361 | Tadano | Sep 2012 | A1 |
20130264777 | Himeno | Oct 2013 | A1 |
20130300068 | Fangauf et al. | Nov 2013 | A1 |
20130313786 | Fangauf | Nov 2013 | A1 |
Number | Date | Country |
---|---|---|
37 42 080 | Jun 1989 | DE |
41 41 999 | Jun 1993 | DE |
196 52 001 | Jun 1997 | DE |
37 14 674 | Nov 1999 | DE |
699 29 489 | Sep 2006 | DE |
102012006125 | Sep 2013 | DE |
0 458 123 | Nov 1991 | EP |
2 059 644 | Jun 1971 | FR |
2 213 539 | Aug 1989 | GB |
2 213 540 | Aug 1989 | GB |
05-263947 | Oct 1993 | JP |
2010-203584 | Sep 2010 | JP |
WO 2015061810 | Apr 2015 | WO |
Entry |
---|
PCT Examiner Oscar Van Wel, International Search Report of the International Searching Authority for International Application PCT/DE2012/000228, mailed Sep. 7, 2012, 3 pages, European Patent Office, HV Rijswijk, Netherlands. |
PCT Examiner Oscar Van Wel, English Translation of PCT Written Opinion of the International Searching Authority for International Application PCT/DE2012/000228, mailed Sep. 7, 2012, 7 pages, European Patent Office, HV Rijswijk, Netherlands. |
Office Action in U.S. Appl. No. 13/983,112, mailed Oct. 10, 2013, 7 pages. |
Number | Date | Country | |
---|---|---|---|
20130307222 A1 | Nov 2013 | US |