- Email: [email protected]
Ball coupling comprising relatively movable seal
PATENTS The next process is to fill in the details on this list.
Assigning values to parameters
Relevant ISO standards
Although some parameters have recently been provided in the public domain and within a manufacturer’s catalogue the meeting did not consider it appropriate to use these parameters without qualification. It was thought that further work across a wide spectrum of applications and finishing methods would be necessary to ensure reliable optimum values. It is for instance possible that different values may be required for individual surface finishing techniques. The group expressed interest in co-operative work across a number of research organisations to permit the use of extensive facilities to provide the large amount of data required. Liaison across Europe and with the major fluid power research work in the USA was viewed as a way forward.
ISO 13565[4] and ISO 11562[5] have been highlighted as being directly relevant to the measurement of rod surfaces if parameters such as Rpk are to be used. ISO 13565 provides a method for measurement with a contact stylus instrument on surfaces with plateau-like properties, such as a ground and then polished or honed surface. ISO 11562 describes the use of filters and measuring conditions when measuring such surfaces. However, these standards must also be used in conjunction with the whole series of ISO procedures for surface texture measurement. These are grouped within the ISO catalogue under the general title ‘Geometrical Product Specifications (GPS) – Surface texture’. The group have collated a list of the known relevant ISO standards. It was noted that it is necessary to ensure compliance with these procedures to ensure repeatable measurements, especially between different locations. The experience of earlier work was that major errors in texture measurement occur if correct procedures are not followed.[6] Individual procedures in the list of ISO standards specify terminology, the equipment, methods of measurement and analysis. It will typically be necessary to be aware of several of these documents to ensure reliable measurement.
The future •
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There was overwhelming interest in keeping the group together and holding a further meeting to assess progress. This has been proposed to coincide with the Hannover Fair in April 2009. Each of the seal manufacturers is investigating the most appropriate texture values that may be proposed for use with its seals. Research organisations have been invited to investigate the potential for collaborative research.
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The group will welcome participation by any company involved with hydraulic cylinder manufacture to provide the benefit of a wide range of experience, applications and surface manufacturing methods.
References 1. F. Steep and G. Wüstenhagen: Counter surfaces of hydraulic sealing system for heavy-duty applications. 19th International Conference on Fluid Sealing, BHR Group, 2007. 2. A. Raidt: Extended approach for the classification of the quality of the sliding surface. 14th International Sealing Conference, VDMA, 2006. 3. R.K. Flitney, I. Hansford and B.S. Nau: The effect of surface texture on reciprocating seal performance. BHR Group Report CR 3069, 1989. 4. ISO 13565, Geometrical product specifications (GPS). Surface quality: Contact stylus procedure – surfaces with plateau-like, functionally relevant properties. Parts 1–4. 5. ISO 11652, Geometric Product Specifications (GPS). Surface texture: Metrological characteristics of phase correct filters. 6. R.K. Flitney: Reciprocating seal test procedure, report of round robin tests. BHR Group Report, DCR 2666, 1986. Contact: R.K. Flitney, Editor, Sealing Technology, UK. Tel: +44 1799 501659, Email: [email protected]
Patents Seal member for rolling device and rolling device Applicant: THK Co Ltd, Japan A seal for use on linear ball bearing races is described. It is designed to permit both linear and rotational motion. Illustrations show application both to cylindrical linear bearing assemblies and also linear slide-way table assemblies. A feature of the seal is that it has a double lip for the dynamic seal and a single lip for the static portion. Publication number: WO/2008/120496 Inventor: T. Murata Publication date: 9 October 2008
Threaded joint for steel pipes Applicants: Sumitomo Metal Industries Ltd, Japan and Vallourec Mannesmann Oil & Gas France, France A threaded joint for oil and gas well steel pipes that is designed for ease of assembly and resistance 12
Sealing Technology
to galling. The stabbing flanks of the threads have a two-step stabbing shape with a chamfer. The proportions and angles are described. Publication number: WO/2008/120828 Inventors: K. Nakamura et al. Publication date: 9 October 2008
Door seal for a refrigerator Applicants: LG Electronics Inc, Korea A revised design of door gasket assembly for refrigerator/freezers with double doors is described. The purpose is to improve the sealing by reducing leakage of cold air and also reduce the problem of condensation that can build up along the shut line of the two doors. Additional sealing webs are included on the gasket and an air damper to increase the contact force on the front of the refrigerator. Publication number: WO/2008/120894
Inventors: M.Y. Lee et al. Publication date: 9 October 2008
Ball coupling comprising relatively movable seal Applicant: Jost-Werke GmbH, Germany A ball coupling for connecting a trailer to vehicles is described. A seal may be fitted to either the ball or the socket. Several seal sections with a flexible lip, that is designed to accommodate lateral movement of the ball and socket are illustrated. Publication number: WO/2008/122350 Inventor: U. Szczepanek Publication date: 16 October 2008
Intervention system dynamic seal and compliant guide Applicants: Services Petroliers Schlumberger, France, et al.
February 2009
Assigning values to parameters
Relevant ISO standards
Although some parameters have recently been provided in the public domain and within a manufacturer’s catalogue the meeting did not consider it appropriate to use these parameters without qualification. It was thought that further work across a wide spectrum of applications and finishing methods would be necessary to ensure reliable optimum values. It is for instance possible that different values may be required for individual surface finishing techniques. The group expressed interest in co-operative work across a number of research organisations to permit the use of extensive facilities to provide the large amount of data required. Liaison across Europe and with the major fluid power research work in the USA was viewed as a way forward.
ISO 13565[4] and ISO 11562[5] have been highlighted as being directly relevant to the measurement of rod surfaces if parameters such as Rpk are to be used. ISO 13565 provides a method for measurement with a contact stylus instrument on surfaces with plateau-like properties, such as a ground and then polished or honed surface. ISO 11562 describes the use of filters and measuring conditions when measuring such surfaces. However, these standards must also be used in conjunction with the whole series of ISO procedures for surface texture measurement. These are grouped within the ISO catalogue under the general title ‘Geometrical Product Specifications (GPS) – Surface texture’. The group have collated a list of the known relevant ISO standards. It was noted that it is necessary to ensure compliance with these procedures to ensure repeatable measurements, especially between different locations. The experience of earlier work was that major errors in texture measurement occur if correct procedures are not followed.[6] Individual procedures in the list of ISO standards specify terminology, the equipment, methods of measurement and analysis. It will typically be necessary to be aware of several of these documents to ensure reliable measurement.
The future •
•
•
There was overwhelming interest in keeping the group together and holding a further meeting to assess progress. This has been proposed to coincide with the Hannover Fair in April 2009. Each of the seal manufacturers is investigating the most appropriate texture values that may be proposed for use with its seals. Research organisations have been invited to investigate the potential for collaborative research.
•
The group will welcome participation by any company involved with hydraulic cylinder manufacture to provide the benefit of a wide range of experience, applications and surface manufacturing methods.
References 1. F. Steep and G. Wüstenhagen: Counter surfaces of hydraulic sealing system for heavy-duty applications. 19th International Conference on Fluid Sealing, BHR Group, 2007. 2. A. Raidt: Extended approach for the classification of the quality of the sliding surface. 14th International Sealing Conference, VDMA, 2006. 3. R.K. Flitney, I. Hansford and B.S. Nau: The effect of surface texture on reciprocating seal performance. BHR Group Report CR 3069, 1989. 4. ISO 13565, Geometrical product specifications (GPS). Surface quality: Contact stylus procedure – surfaces with plateau-like, functionally relevant properties. Parts 1–4. 5. ISO 11652, Geometric Product Specifications (GPS). Surface texture: Metrological characteristics of phase correct filters. 6. R.K. Flitney: Reciprocating seal test procedure, report of round robin tests. BHR Group Report, DCR 2666, 1986. Contact: R.K. Flitney, Editor, Sealing Technology, UK. Tel: +44 1799 501659, Email: [email protected]
Patents Seal member for rolling device and rolling device Applicant: THK Co Ltd, Japan A seal for use on linear ball bearing races is described. It is designed to permit both linear and rotational motion. Illustrations show application both to cylindrical linear bearing assemblies and also linear slide-way table assemblies. A feature of the seal is that it has a double lip for the dynamic seal and a single lip for the static portion. Publication number: WO/2008/120496 Inventor: T. Murata Publication date: 9 October 2008
Threaded joint for steel pipes Applicants: Sumitomo Metal Industries Ltd, Japan and Vallourec Mannesmann Oil & Gas France, France A threaded joint for oil and gas well steel pipes that is designed for ease of assembly and resistance 12
Sealing Technology
to galling. The stabbing flanks of the threads have a two-step stabbing shape with a chamfer. The proportions and angles are described. Publication number: WO/2008/120828 Inventors: K. Nakamura et al. Publication date: 9 October 2008
Door seal for a refrigerator Applicants: LG Electronics Inc, Korea A revised design of door gasket assembly for refrigerator/freezers with double doors is described. The purpose is to improve the sealing by reducing leakage of cold air and also reduce the problem of condensation that can build up along the shut line of the two doors. Additional sealing webs are included on the gasket and an air damper to increase the contact force on the front of the refrigerator. Publication number: WO/2008/120894
Inventors: M.Y. Lee et al. Publication date: 9 October 2008
Ball coupling comprising relatively movable seal Applicant: Jost-Werke GmbH, Germany A ball coupling for connecting a trailer to vehicles is described. A seal may be fitted to either the ball or the socket. Several seal sections with a flexible lip, that is designed to accommodate lateral movement of the ball and socket are illustrated. Publication number: WO/2008/122350 Inventor: U. Szczepanek Publication date: 16 October 2008
Intervention system dynamic seal and compliant guide Applicants: Services Petroliers Schlumberger, France, et al.
February 2009