Figure 5. A finite element analysis (FEA) model showing a comparison of the von Mises stress contour of a rubber O-ring with a groove base angle of 60º WRS and 70º ERWWRP at a pressure of 12 MPa.>@
PATENTS Rotary shaft lip-seal Applicant: Trelleborg Sealing Solutions Germany GmbH, Germany A rotary shaft lip-seal designed for highpressure applications has been developed. It includes a supporting element that is designed to fit just behind the atmospheric side of the seal lip. Both conventional cross-section lip seals and alternative designs are described by the patent. In addition alternative designs of 12
support ring are covered. Hydraulic and pneumatic cylinder applications are also discussed. Patent number: WO/2011/012129 Inventor: M. Franz Publication date: 3 February 2011
Rolling bearing assembly with a radial shaft seal Applicant: Aktiebolaget SKF, Sweden This invention relates to a rolling bearing assembly. A multi-row taper roller bearing assembly is illustrated. The radial shaft seal has a support ring and a sealing lip. At least one end-face of the outer ring has a receptacle
2. Mike Goodrich, A pump seal selection guideline complementing ISO 21049/API 682, Sealing Technology, July 2010, pp. 8–12. 3. Chesterton A2382 dual seal raises the performance bar while lowering costs, Sealing Technology, October 2010, pp. 8–11. 4. Ellen Klier, Seal development improves reliability of pumps for polymer latex, Sealing Technology, September 2010, pp. 7–8. 5. Clemens Simon, Klaus Lang, Peter Feigl and Eberhard Bock, Turbocharger seal as a decisive enabler for downsizing concepts, Sealing Technology, January 2011, pp. 10–11. 6. Bob Flitney, Advances in understanding of polymer seals for rotating applications, Sealing Technology, November 2010. pp. 7–11. 7. Turcon M12 material sets new benchmark in hydraulic sealing, Sealing Technology, April 2011, pp. 7–9. 8. Stefano Arrigoni, Fabiano Merli and Peter Farrow, New perfluoroelastomer for sealing at low temperatures, Sealing Technology, September 2010, pp. 9–13. 9. Bob Flitney, ‘Bob’s Bit’ column, Sealing Technology, November 2009. p. 3. 10. Darryl Turland, Do compression set results measure up? Sealing Technology, December 2010, pp. 11–13. 11. Buc Slay and Winston Webber, Stress relaxation of elastomer compounds, Sealing Technology, February 2011, pp. 9–12. 12. Jürgen Braun, Current elastomer compatibility test standards – a critical view, Sealing Technology, March 2011, pp. 8–12. 13. N.K. Sinha, Baldev Raj and R. Mukhopadhyay, Development of fluoroelastomer back-up seal: snapshots of a novel effort in rubber engineering for a critical application, Sealing Technology, April 2011, pp. 10–13 and May 2011, pp. 9–12. 14. Meng Hou, Ming Su, Yongwen Liu and Zheng Gui, Analysis of a dovetail O-ring groove performance, Sealing Technology, August 2010, pp. 9–12.
for holding the support ring of the seal. This extends – in particular, protruding axially – over the end-face of the outer ring. The sealing lip is in contact with the outer circumferential surface of the inner ring. Patent number: WO/2011/012667 Inventors: B. Liang, T. Peuschel, A. Schwappach and M. Reugels Publication date: 3 February 2011
Dispenser with sliding seal Applicant: PA Knowledge Ltd, UK This invention relates to devices and methods for dispensing metered doses of a fluid for treating a
PATENTS ble, adhesive strength and is easy to remove and replace, without it being influenced by the application environment. The bearing is equipped with a pair of elastic seal members (5) that seal each end in the axial direction of the bearing space (4) on inner and outer rings (1 & 2). Fitting recesses (7), which press-fit the bases (6) of the seal members (5), are disposed on both the inner and outer rings (1 & 2), and interferences (which are shaped with recesses and projections) are disposed on either the bases (6) of the seal members (5), or on the interior of the fitting recesses (7), or on both. The bases (6) of the seal members (5) are pressfit and fixed into each of the fitting recesses (7) using a silane adhesive. Patent number: WO/2011/013551 Inventors: M. Hori, K. Suzuki and N. Kuwahara Publication date: 3 February 2011
Piston-ring coating Applicant: Federal-Mogul Burscheid GmbH, Germany This invention relates to a piston-ring coating on at least one running surface. It comprises – from the inside out – an adhesive layer; a metal-containing, preferably a tungsten-containing, diamond-like carbon (DLC) layer; and a metalfree DLC layer. It is characterised in that the ratio of the thickness of the metal-free DLC layer to the thickness of the metal-containing DLC layer ranges from 0.7–1.5 μm and/or to the overall thickness of the coating ranges from 0.4–0.6 μm. Note that it is assumed that the thickness measurements are given in micrometres, but this cannot be confirmed from the German text. Patent number: WO/2011/018252 Inventors: M. Kennedy and M. Zinnabold Publication date: 17 February 2011
Gasket for a metal separator Examples of the lip-seal with support that forms the subject of patent WO/2011/012129.
person or animal. It is used, in particular, for eye treatment, or for systemic treatment via the eye. A fluid dispenser is detailed that includes a sealable reservoir for storing the fluid to be dispensed; a transfer body for carrying a predetermined volume of fluid from the reservoir to a dispensing point; and a sliding seal for maintaining the reservoir in a sealed state while a portion of the transfer is moved to the dispensing point. Patent number: WO/2011/012856 Inventors: D.J.T. Whitaker, D.M. Russell, T.M. Kemp and C.H. Nelson Publication date: 3 February 2011
Seal structure for a slewing bearing Applicant: NTN Corp, Japan Disclosed is a seal structure for a slewing bearing, used in a wind turbine. It has a sta-
Applicant: Hyundai Hysco, Korea Disclosed is a gasket for a metal separator. It has a dual structure that improves the stiffness and sealing property of the foil metal separator. It is composed of a first gasket, which is formed at each edge region of a channel, and a manifold of a metal main body, comprising the channel and the manifold by using a material such as reinforced plastics, high hardness rubber and the like (and provides stiffness to the metal main body). A second gasket is formed on the first gasket by using a material such as rubber and the like, and provides sealing properties to the channel and the manifold. Patent number: WO/2011/013869 Inventors: Y.-T. Jeon, K-J. Kim and Y.-S. Jeong Publication date: 3 February 2011 Technical Editor’s comment: The application is not mentioned in the English abstract and the design is not one with which I am familiar.
Method of connecting sealing elements
Patent WO/2011/013551 provides details of a slewing bearing seal. The diagram shows the method used for seal retention.
Applicant: Thyssenkrupp Drauz Nothelfer GmbH, Germany This patent describes a method of joining the two mating ends of a vehicle door seal. The alignment of the two mating seal profiles, the way in which they are positioned and subsequent welding, or heating in the presence of adhesive, are also discussed. Patent number: WO/2011/018131 Inventors: H.G. Haupenthal, N. Fenger and M. Maier Publication date: 17 February 2011
Mechanical seal Applicant: JGC Corp, Japan A dual mechanical seal arrangement for a mixing vessel has been developed. It has a buffer supply between the seals. There is also an external lip seal which can be used to exclude air from the complete mechanical seal assembly during sterilising operations. Patent number: WO/2011/018879 Inventors: T. Kojima and S. Yamagami Publication date: 17 February 2011
Seal member for preventing leakage of a micro-powder from a rotating body Applicant: Sanwa Techno Co Ltd, Japan The seal member described by this patent is for micro-powder, or toner used for a developing roller, or the like, such as an electro-photographic image-processor or copying machine. It comprises a base fabric, which consists of a ‘‘knitted’’ structure, and a loop-shaped pile yarn, or cut-shaped pile yarn, which is supported on the surface of the base fabric by the entanglement or support of ground yarn of the base fabric. A coating layer has penetrated from the back surface of the base fabric, to which a coating agent is applied, to the side of pile yarn. The thickness (or height) of the coating agent, which has penetrated from the back surface of the base fabric, is the same as, or less than, that of the base fabric. Details of the weaving process are illustrated. Patent number: WO/2011/018948 Inventors: S. Shoji and K. Fukui Publication date: 17 February 2011