- Email: [email protected]
Cylinder liner technology reduces engine oil consumption
NEWS
Valve stem seal uses counter-pressure lip to reduce blow-by
F
reudenberg Sealing Technologies GmbH & Co Kg is offering a new generation of valve stem seal which, it claims, dramatically reduces blow-by in turbo-charged diesel engines. The valve stem seal is fitted with a special counter-pressure sealing lip. In addition to a conventional sealing lip this also seals the valve stem from the exhaust gas stream. One of the main functions of the valve stem seal is to maintain lubrication on the valve bodies. However, conventional valve stem seals are a source of oil and/or blow-by leakage. In turbocharged diesel engines with high exhaust-gas counter-pressure in particular, the sealing lip of the valve stem seal can lift, thereby causing a leak. When conventional valve stem seals are used, the amount of blow-by actually leaked at corresponding differential pressures is over 40% higher than the actual target value. At the same time combustion residue is deposited on the valve stem seal, which impairs its ability to function effectively. Extensive tests have shown that standard valve stem seals lift at a differential pressure of between 1.5 bar and 4 bar (0.15 MPa and 0.4 MPa). With a secondary reinforcement lip this lifting reaction can be delayed until a differential pressure of between 4.5 bar and 5 bar (0.45 MPa and 0.5 MPa) is attained. However, only the use of an additional counter-pressure lip can delay the undesirable lifting of the valve stem seals until a differential pressure of well over 6 bar (0.6 MPa) is attained – an uncritical range even in turbo-charged engines. For comparison purposes, different valve stem seals were installed in the same engine and subjected to load tests at high engine speeds over a time-frame of 300 hours. Major differences were observed: the standard valve stem seals were noticeably contaminated with exhaust-gas residue at the end of the test, whereas the valve stem seals with the special counter-pressure sealing lip remained completely unaffected, says the company. These valve stem seals help to create ideal sealing conditions, minimising oil consumption and blow-by, and preserving the functionality of the particulate filter.
Contact: Freudenberg Sealing Technologies GmbH & Co Kg, 69465 Weinheim, Germany. Tel: +49 6201 80 6666, Fax: +49 6201 88 6666, Email: [email protected], Web: www.freudenberg-ds.de
4
Sealing Technology
Momentive expands silicone product range used to make solar modules
M
omentive Performance Materials Inc has expanded the range of SilTRUST products that it offers the photovoltaics industry with the introduction of TSE3822-W adhesive sealant and TSE3667 potting material. TSE3822-W is a one-component, oxime-cure silicone adhesive sealant that cures into elastic rubber at room temperature with exposure to moisture in the air. The firm says that it has excellent adhesion properties and is compatible with most materials used in the photovoltaic industry – including aluminium frames, back sheets and glass – without using a primer. The TSE3667 potting material has been developed for electric potting. This two-component, condensation-cure silicone rubber cures at room temperature to form an elastic flame-retardant rubber that adheres to various types of materials, including most metals, plastics, glass and ceramics (again, without the use of a primer). ‘Momentive’s patented SilTRUST technology builds on decades of experience protecting the solar arrays of spacecraft and satellites,’ said Robert Benson, Global Marketing Director of Eco-Energy, Momentive Performance Materials. ‘Our solar products can protect and enhance the efficiency and durability of photovoltaic modules in harsh outdoor environments. They also help to reduce manufacturing costs.’
Contact: Momentive Performance Materials Inc, 180 East Broad Street, Columbus, OH 43215, USA. Tel: +1 607 786 8131, Web: www.momentive.com
‘Federal-Mogul is helping engine manufacturers to increase the power output and durability of smaller engines – supporting them in a key area of their global CO2 reduction strategies,’ explained Gian Maria Olivetti, Vice President for Technology and Innovation, Powertrain Energy, Federal-Mogul. ‘Cylinder bore distortion is one of the main factors limiting increases in power and torque outputs, particularly in lightweight aluminium cylinder blocks. Our patented Hybrid Liner increases the strength and stiffness of the combined block and liner assembly, enabling a significant weight reduction to be achieved without compromising engine performance and durability.’ The liner is composed of a conventional castiron sleeve with an aluminium coating applied to its exterior surface, using a proprietary process. The sleeve provides good tribological properties and is compatible with cost-effective ring packs. The outer surface of the liner is manufactured to provide a surface topography that is conducive to mechanical interlocking with the aluminium block material. The liner coating is an AlSi12 alloy with a melting point below that of the aluminium engine block, which provides outstanding inter-metallic bonding between the surfaces of the two materials. Olivetti added: ‘Federal-Mogul’s Hybrid Liner also enables engine manufacturers to improve packaging by reducing the distance between adjacent cylinders. Pressure die-cast engine blocks using the liners can have a material wall thickness of just 3 mm between the bores.’ ‘If a water channel is drilled between two cylinders, the Hybrid Liner technology limits the formation of cracks, allowing coolant to penetrate only as far as the liner coating. Conventional liners can allow water to seep down the joint between liner and casting – reaching the crankcase and contaminating the lubricating oil.’ Contact: Federal-Mogul Corp, 26555 Northwestern Highway, Southfield, MI 48034, USA. Tel: +1 248 354 7700, Fax: +1 248 354 4530, Web: www.federal-mogul.com
Cylinder liner technology reduces Company News engine oil consumption
F
ederal-Mogul Corp is increasingly using a dual-material cylinder liner technology to reduce bore distortion and improve function in the latest generation of lighter, highly-loaded gasoline engines. The company says that its patented Hybrid Liner technology provides reliable, cost-effective, long-term performance while reducing engine oil consumption, especially in high-output aluminium engines with small inter-bore bridges and weight optimised designs.
Acquisition strengthens Royal’s position in the aerospace and marine sectors
I
n the USA, Royal Adhesives & Sealants Llc, a portfolio company of Arsenal Capital Partners, and a producer of
July 2012
Valve stem seal uses counter-pressure lip to reduce blow-by
F
reudenberg Sealing Technologies GmbH & Co Kg is offering a new generation of valve stem seal which, it claims, dramatically reduces blow-by in turbo-charged diesel engines. The valve stem seal is fitted with a special counter-pressure sealing lip. In addition to a conventional sealing lip this also seals the valve stem from the exhaust gas stream. One of the main functions of the valve stem seal is to maintain lubrication on the valve bodies. However, conventional valve stem seals are a source of oil and/or blow-by leakage. In turbocharged diesel engines with high exhaust-gas counter-pressure in particular, the sealing lip of the valve stem seal can lift, thereby causing a leak. When conventional valve stem seals are used, the amount of blow-by actually leaked at corresponding differential pressures is over 40% higher than the actual target value. At the same time combustion residue is deposited on the valve stem seal, which impairs its ability to function effectively. Extensive tests have shown that standard valve stem seals lift at a differential pressure of between 1.5 bar and 4 bar (0.15 MPa and 0.4 MPa). With a secondary reinforcement lip this lifting reaction can be delayed until a differential pressure of between 4.5 bar and 5 bar (0.45 MPa and 0.5 MPa) is attained. However, only the use of an additional counter-pressure lip can delay the undesirable lifting of the valve stem seals until a differential pressure of well over 6 bar (0.6 MPa) is attained – an uncritical range even in turbo-charged engines. For comparison purposes, different valve stem seals were installed in the same engine and subjected to load tests at high engine speeds over a time-frame of 300 hours. Major differences were observed: the standard valve stem seals were noticeably contaminated with exhaust-gas residue at the end of the test, whereas the valve stem seals with the special counter-pressure sealing lip remained completely unaffected, says the company. These valve stem seals help to create ideal sealing conditions, minimising oil consumption and blow-by, and preserving the functionality of the particulate filter.
Contact: Freudenberg Sealing Technologies GmbH & Co Kg, 69465 Weinheim, Germany. Tel: +49 6201 80 6666, Fax: +49 6201 88 6666, Email: [email protected], Web: www.freudenberg-ds.de
4
Sealing Technology
Momentive expands silicone product range used to make solar modules
M
omentive Performance Materials Inc has expanded the range of SilTRUST products that it offers the photovoltaics industry with the introduction of TSE3822-W adhesive sealant and TSE3667 potting material. TSE3822-W is a one-component, oxime-cure silicone adhesive sealant that cures into elastic rubber at room temperature with exposure to moisture in the air. The firm says that it has excellent adhesion properties and is compatible with most materials used in the photovoltaic industry – including aluminium frames, back sheets and glass – without using a primer. The TSE3667 potting material has been developed for electric potting. This two-component, condensation-cure silicone rubber cures at room temperature to form an elastic flame-retardant rubber that adheres to various types of materials, including most metals, plastics, glass and ceramics (again, without the use of a primer). ‘Momentive’s patented SilTRUST technology builds on decades of experience protecting the solar arrays of spacecraft and satellites,’ said Robert Benson, Global Marketing Director of Eco-Energy, Momentive Performance Materials. ‘Our solar products can protect and enhance the efficiency and durability of photovoltaic modules in harsh outdoor environments. They also help to reduce manufacturing costs.’
Contact: Momentive Performance Materials Inc, 180 East Broad Street, Columbus, OH 43215, USA. Tel: +1 607 786 8131, Web: www.momentive.com
‘Federal-Mogul is helping engine manufacturers to increase the power output and durability of smaller engines – supporting them in a key area of their global CO2 reduction strategies,’ explained Gian Maria Olivetti, Vice President for Technology and Innovation, Powertrain Energy, Federal-Mogul. ‘Cylinder bore distortion is one of the main factors limiting increases in power and torque outputs, particularly in lightweight aluminium cylinder blocks. Our patented Hybrid Liner increases the strength and stiffness of the combined block and liner assembly, enabling a significant weight reduction to be achieved without compromising engine performance and durability.’ The liner is composed of a conventional castiron sleeve with an aluminium coating applied to its exterior surface, using a proprietary process. The sleeve provides good tribological properties and is compatible with cost-effective ring packs. The outer surface of the liner is manufactured to provide a surface topography that is conducive to mechanical interlocking with the aluminium block material. The liner coating is an AlSi12 alloy with a melting point below that of the aluminium engine block, which provides outstanding inter-metallic bonding between the surfaces of the two materials. Olivetti added: ‘Federal-Mogul’s Hybrid Liner also enables engine manufacturers to improve packaging by reducing the distance between adjacent cylinders. Pressure die-cast engine blocks using the liners can have a material wall thickness of just 3 mm between the bores.’ ‘If a water channel is drilled between two cylinders, the Hybrid Liner technology limits the formation of cracks, allowing coolant to penetrate only as far as the liner coating. Conventional liners can allow water to seep down the joint between liner and casting – reaching the crankcase and contaminating the lubricating oil.’ Contact: Federal-Mogul Corp, 26555 Northwestern Highway, Southfield, MI 48034, USA. Tel: +1 248 354 7700, Fax: +1 248 354 4530, Web: www.federal-mogul.com
Cylinder liner technology reduces Company News engine oil consumption
F
ederal-Mogul Corp is increasingly using a dual-material cylinder liner technology to reduce bore distortion and improve function in the latest generation of lighter, highly-loaded gasoline engines. The company says that its patented Hybrid Liner technology provides reliable, cost-effective, long-term performance while reducing engine oil consumption, especially in high-output aluminium engines with small inter-bore bridges and weight optimised designs.
Acquisition strengthens Royal’s position in the aerospace and marine sectors
I
n the USA, Royal Adhesives & Sealants Llc, a portfolio company of Arsenal Capital Partners, and a producer of
July 2012