FEATURE/PATENTS 12 Sealing Technology July 2013 mounted on measuring instruments that are currently used. Researchers at the University of Stuttgart are pursuing ways of solving such challenging measurement problems. References seals – overview and function, 18th International Colloquium Tribology, Ostfildern-Nellingen, Germany, 10–12 January 2012, p. 155, ‘Book of Synopses 2012’, W.J. Bartz (ISBN 3-924813-97-3). 2. ‘DIN 3160: Radial-Wellendichtringe’, Deutsches Institut für Normung eV, September 1996. 3. ‘DIN 3161: Radial-Wellendichtringe für Kraftfahrzeuge’, Deutsches Institut für Normung eV, January 1984 4. ‘MBN 31 007-7: Geometrical Product Specifications (GPS) – Surface Texture – Measurement and Evaluation Method for Sealing Surfaces, (factory standard), Daimler Ag, September 2008. von Wellenoberflächen für Radialwellendichtringe’, corporate litera- ture, Freudenberg Simrit Kg, Weinheim, Germany. 6. ‘RMA OS-1-1: Shaft Finish Requirements Technical Bulletin, (revised 2004), Rubber Manufacturers Association, Washington, DC, USA. Dralldetektion, Qualität und Zuverlässigkeit, Stochastische Strukturen, Aif-Nr. 15168N, FKM Forschungsheft 307, 2010. 10. ‘ISO 25178: Geometrical product specifications (GPS) – Surface texture: Areal’, International Organization for Standardization, September 2012. 11. Kunstfeld, T., ‘Einfluss der Wellenoberfläche auf das Dichtverhalten von Radial- Wellendichtungen’ (dissertation 2005), Universität Stuttgart, Institutsbericht Nr. 115. 12. Baitinger, G., Multiskalenansatz mit Mikrostrukturanalyse zur Drallbeurteilung von Dichtungsgegenlaufflächen (dissertation 2011), Universität Stuttgart, Institutsbericht Nr. 135 Contact: Dipl.-Ing. Matthias Baumann, Institut für Maschinenelemente (Zimmer 2.213), Universität Stuttgart, Pfaffenwaldring 9, 70569 Stuttgart, Germany. Tel: +49 711 685 66649, Fax: +49 711 685 66319, Email: [email protected], Web: www.ima.uni-stuttgart.de/institut/institut.html Figure 7. A process schematic of micro-structure analysis. Figure 8. Characterisation of single micro- structures, showing the ellipse ‘‘fitted’’ to, or ‘‘enclosing’’, an isolated micro-structure. PATENTS Sealing arrangement for a syringe Applicant: Abbott Laboratories, USA A sealing arrangement for a syringe contain- ing a high water-content product and for use in a drug infusion system forms the subject of this patent. The syringe includes a plunger that carries front and rear O-rings made of a compound such as chlorobutyl or bromobutyl rubber, which imparts low gas permeability characteristics to the seals. The plunger may be moulded as a single part or as two com- ponents. The O-rings may be surface treated with a lubricant to improve sealing where the moulding process gives rise to parting lines in the seal glands, which can result in leak paths on the inner diameter of the O-rings. The latter provide a gas-tight sliding seal that can withstand a change in temperature of –25°C to 40°C, and the resulting thermal expansion and contraction of the high water-content product. Patent number: WO/2013/033453 Inventors: M.J. Gibler, M.A. Bennett, R. Conjeevaram, T. Rebne, B. Clark, Publication date: 7 March 2013 Profiled seal Applicant: Federal-Mogul Sealing Systems GmbH, Germany This invention relates to a seal (1) for sealing, against each other, an upper (2) and a lower (3) half of a housing for liquids. It is composed of a circumferential inner seal portion (4) and a circumferential outer seal portion (5) which sit against the upper and the lower housing halves, when the seal is installed. The outer seal portion has at least one ridge (6) which faces a housing half and receives a housing half rib (7)
Transcript
FEATURE/PATENTS
12Sealing Technology July 2013
mounted on measuring instruments that are currently used. Researchers at the University of Stuttgart are pursuing ways of solving such challenging measurement problems.
References
seals – overview and function, 18th International Colloquium Tribology, Ostfildern-Nellingen, Germany, 10–12 January 2012, p. 155, ‘Book of Synopses 2012’, W.J. Bartz
10. ‘ISO 25178: Geometrical product specifications (GPS) – Surface texture: Areal’, International Organization for Standardization, September 2012.
11. Kunstfeld, T., ‘Einfluss der Wellenoberfläche auf das Dichtverhalten von Radial-Wellendichtungen’ (dissertation 2005), Universität Stuttgart, Institutsbericht Nr. 115.
12. Baitinger, G., Multiskalenansatz mit Mikrostrukturanalyse zur Drallbeurteilung von Dichtungsgegenlaufflächen (dissertation 2011), Universität Stuttgart, Institutsbericht Nr. 135
Figure 7. A process schematic of micro-structure analysis.
Figure 8. Characterisation of single micro-structures, showing the ellipse ‘‘fitted’’ to, or ‘‘enclosing’’, an isolated micro-structure.
PATENTSSealing arrangement for a syringeApplicant: Abbott Laboratories, USAA sealing arrangement for a syringe contain-ing a high water-content product and for use in a drug infusion system forms the subject of this patent. The syringe includes a plunger that carries front and rear O-rings made of a compound such as chlorobutyl or bromobutyl rubber, which imparts low gas permeability characteristics to the seals. The plunger may
be moulded as a single part or as two com-ponents. The O-rings may be surface treated with a lubricant to improve sealing where the moulding process gives rise to parting lines in the seal glands, which can result in leak paths on the inner diameter of the O-rings. The latter provide a gas-tight sliding seal that can withstand a change in temperature of –25°C to 40°C, and the resulting thermal expansion and contraction of the high water-content product.Patent number: WO/2013/033453Inventors: M.J. Gibler, M.A. Bennett,
R. Conjeevaram, T. Rebne, B. Clark,
Publication date: 7 March 2013
Profiled seal
Applicant: Federal-Mogul Sealing Systems GmbH, GermanyThis invention relates to a seal (1) for sealing, against each other, an upper (2) and a lower (3) half of a housing for liquids. It is composed of a circumferential inner seal portion (4) and a circumferential outer seal portion (5) which sit against the upper and the lower housing halves, when the seal is installed. The outer seal portion has at least one ridge (6) which faces a housing half and receives a housing half rib (7)
when the seal is installed. This rib is comple-mentary to the ridge. The seal also includes a connecting piece (8) between the inner and the outer portions (4 & 5).Patent number: WO/2013/029811Inventors: M. Gasch and R. SalamehPublication date: 7 March 2013
Arrangement for sealing a master cylinder on the side of the piston rodApplicant: Schaeffler Technologies Ag & Co Kg, GermanyAn arrangement has been developed for sealing a master cylinder on the side of the piston rod. It is particularly relevant to a hydraulically actu-ated clutch or brake system, in which the rod connected to the piston of the master cylinder is protected – relative to the housing of the master cylinder – by a bellows-type seal, which prevents dirt from entering the master cylinder. The seal comprises a first, relatively elastic sealing com-ponent and a second, relatively inelastic sealing component. The first component is connected both to the housing of the master cylinder and to the second sealing component in a manner that creates a leak-proof structure. The second sealing component is arranged in such a way that it also creates a leak-proof structure on the piston rod, on which it also can move.Patent number: WO/2013/029741Inventor: R. FrietschPublication date: 7 March 2013
Dynamic seal
Applicant: Rausch & Pausch GmbH, Germany
A dynamic seal for radial sealing between two components that can be displaced axially rela-tive to one another is described by this patent. It consists of a sealing body made from an elas-tomeric material. It has two sealing lips that are spaced apart axially and lie radially on the out-side, and two sealing lips that are again spaced apart axially, but lie radially on the inside. It also includes a supporting body (which carries the sealing body) that is composed of a harder material – in particular a plastic – than the sealing body. The supporting body has a radi-ally exposed guide section which extends in the axial direction between two sealing lips for axial guidance of a movable component, and an anchoring section that lies opposite the guide section and is intended to anchor the seal.Patent number: WO/2013/029903Inventors: M. Schlick, W. Döhla and O. SeewaldPublication date: 7 March 2013
Wheel-bearing seal
Applicant: NTN Corp, JapanThe objective of this invention is to provide a wheel-bearing seal that possesses increased resistance to muddy water and provides improved sealing performance. The patent, describing the design, provides details of a seal (7) in which a side lip (13a) is in slid-ing contact with an upright plate unit (11b)
of a slinger (11) with a predetermined axial-direction interference between them. The seal member (13) is wrapped around and anchored from the outermost surface of the end-part on a fitting (12a) of a core metal (12) to the inner edge of a bore part (12b). An ‘‘eave-like’’ struc-ture (15), for blocking an annular space formed between the seal plate (10) and the slinger (11), is integrally formed on the end-part of the seal member (13). It is formed on a circumferential-direction portion, excluding a lower portion positioned on the road-surface side, and acting as a drain. The inner diameter (d1) of the eave-like part (15) is smaller than the outer diameter (d2) of the upright plate unit (11b) of the slinger (11). The eave-like part is also in light contact with the upright plate unit (11b), or in opposition to it, across a slight gap – creating a labyrinth seal.Patent number: WO/2013/031904Inventors: J. Sanaka and Y. AritakePublication date: 7 March 2013
Seal plate for a membrane separation device
Applicant: NanoH2O Inc, USAThis patent describes sealing systems, seal plates and sealing rings that are designed to be used in membrane separation devices. In some cases, the systems relieve pressure differentials between different sections of membrane separa-tion devices, whilst still providing a robust seal between each membrane separation unit and a device housing which holds multiple membrane separation units. In some cases, the membrane separation units can be inserted and removed from a device housing in both the fluid-flow direction and in the opposite direction. These sealing systems may also permit fluid flow in both a normal flow direction and in a reverse direction.Patent number: WO/2013/033616Inventors:Publication date: 7 March 2013
Plate-integrated gasket
Applicant: NOK Corp, JapanThe purpose of this invention is to provide a plate-integrated gasket, configured so that a seal member (3), which is applied to two lami-nated plates (1 & 2), can be mounted within a reduced width and so that the gasket can be manufactured easily and efficiently. In order to realise this design, the outer peripheral surface (1a) of one of the plates (1) is fitted, or loosely fitted, in a stepped surface (21a) formed in the second plate (2). The seal member (3), which consists of a material that has rubber-like elas-ticity, is integrally formed on the first plate (1)
PATENTS
July 2013 Sealing Technology13
Patent WO/2013/029811 provides details of a way of sealing, against each other, an upper (2) and a lower (3) half of a housing for liquids.
The objective of this invention is to provide a wheel-bearing seal (7) that possesses increased resistance to muddy water and provides improved sealing performance. Patent WO/2013/031904 has further details.
