WO2000075498A1 - Encapsulated apparatus and method of manufacture - Google Patents
Encapsulated apparatus and method of manufacture Download PDFInfo
- Publication number
- WO2000075498A1 WO2000075498A1 PCT/GB2000/002016 GB0002016W WO0075498A1 WO 2000075498 A1 WO2000075498 A1 WO 2000075498A1 GB 0002016 W GB0002016 W GB 0002016W WO 0075498 A1 WO0075498 A1 WO 0075498A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- framework
- accordance
- assembly
- mechanical engineering
- outer casing
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/11—Thermal or acoustic insulation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/0065—Shape of casings for other machine parts and purposes, e.g. utilisation purposes, safety
- F02F7/008—Sound insulation
Definitions
- the present invention relates to a containment and support assembly for a mechanical engineering apparatus, in particular an assembly with a structural function and which is required to comprise an enclosure, for example to contain fluids or attenuate noise or thermal emissions.
- the invention also relates to a method of containment of such an apparatus.
- the wall thickness is often determined by the technical limits of casting manufacturing processes, say 4 to 5 mm for sand castings. Highly stressed regions of the structure will need to be heavy sections and the adjacent walls will need to maintain a section size that will permit adequate metal flow. If the apparatus is a fabrication, the welding of heavy frame sections to lighter panel sections creates a mismatch at the weld zone. Further, lighter welded sections may vibrate more than desired. Further still, the sealing efficiency of a fabricated apparatus between the frame and panels may not be adequate if the weld seam alone forms the seal.
- Castings are often specified in place of fabrications due to the need to provide for flat-machined flanges which can be readily sealed. If the enclosure function could be removed, the structural load path through many apparatus could be reduced to a minimum and thus accommodated by a relatively simple fabricated frame made from beam sections or by a relatively simple casting.
- a further consideration with many engineering structures is the level of noise emission.
- environmental considerations create a pressure for reduction in noise emissions.
- Such considerations apply to, for example, the cylinder block of an internal combustion engine.
- a conventional cast metal engine cylinder block is relatively inefficient in attenuating the noise produced within the engine, and a cylinder block design which enhances noise attenuation is generally desirable.
- a yet further problem in internal combustion engines is the need for thermal retention after cold-starting and in cold ambient conditions.
- a reduction in uncontrolled thermal losses from the engine cylinder block would assist a fast warm-up and thus would not only reduce the time for exhaust catalytic converters and in-vehicle air heating systems to commence operation but would also bring the engine up to its most fuel-efficient operating temperature in a shorter time.
- a containment and support assembly for a mechanical engineering apparatus comprises a generally rigid open structural framework, provided with mounting means for engagement with components of a mechanical engineering apparatus such as to provide structural support for a mechanical engineering apparatus mounted thereon; and an outer casing fabricated from a lower density material which co-operates with the framework to define and at least substantially enclose a volume in which the mechanical engineering apparatus is contained when mounted upon the framework.
- the structural framework provides substantially all of the mechanical strength required to support the mechanical engineering apparatus in use.
- the outer casing contributes little to the structural strength of the overall assembly, and instead performs the bulk of the enclosure and containment function, i.e. to contain, for example, a coolant or lubricant, to provide some form of noise or thermal insulation, or similar function.
- the outer casing can be manufactured from a substantially lower density material than the framework, since it has little or no role in contributing to the overall strength of the assembly.
- the outer casing, and hence the overall assembly can therefore be much lighter than would be the case for conventionally manufactured apparatus of this type.
- the framework may of a relatively high density metallic material, and may be a casting.
- the casing may be a low density plastics or composite material, and may be a moulding.
- Significant potential weight advantages are offered compared with structures in which the casing is also a casting, and also compared with fabricated structures.
- the outer casing may be a multi -component construction, comprising one or more relatively rigid inner wall elements which engage upon the framework to define internal volume (s) within the assembly for receipt of components of the mechanical engineering apparatus, over which a casing body of suitable light weight low density material is fitted.
- the invention is particularly suited to embodiments where the apparatus is an internal combustion engine and the assembly comprises an engine cylinder block, or where the apparatus is a gear box and the assembly comprises a gear 5 box casing.
- a method for containing and structurally supporting a mechanical engineering apparatus comprises : providing a generally rigid open structural framework; engaging components of the mechanical engineering apparatus on mounting means provided upon the framework, such that the framework provides structural support for the mechanical engineering apparatus mounted thereon; applying an outer casing of lower density material to the framework which co-operates with the framework to define and at least substantially enclose a volume in which the mechanical engineering apparatus is mounted.
- the outer casing is conveniently applied by a moulding process in which the outer casing is moulded around the assembled framework.
- accessories such as sensors and monitors with accompanying cables, fluid conduits, wiring harnesses etc may be mounted upon the framework prior to the step in which the outer casing is applied.
- cavities within the assembly are fabricated in a two stage process in which one or more relatively rigid preformed skin elements are first attached to the framework to define suitable volumes, and the body of casing is subsequently assembled therearound, for example by moulding.
- the body of the casing preferably comprises a low density plastics material which is preferably poured or injected to a mould containing the framework and other elements as applicable, and fills the remaining mould cavity to complete the encapsulation.
- the outer casing has no structural function during routine operation of the mechanical engineering apparatus. Nevertheless , it serves a containment function, which may place some material requirements in relation to strength and toughness on the material selection for the outer casing, and the invention is not intended to exclude this.
- the outer casing of an engineering apparatus is required to provide a high degree of containment, for example to cope with the impact of components subsequent to failure of the apparatus, it maybe necessary to incorporate a higher strength layer within or attached to a surface of the outer casing.
- This higher strength layer may comprise a mesh or netting such as a wire mesh.
- Figure 1 is a cross-sectional end view through a structural part of an engine encapsulated prior to general engine assembly in accordance with first and second embodiments of the present invention
- Figure 2 is a longitudinal cross-sectional view through the encapsulated structural part of the engine of figure 1;
- Figure 3 is a cross-sectional end view through a part-assembled engine encapsulated in accordance with a third embodiment of the invention.
- Figures 4a and 4b are respectively isometric and cross-sectional views through a gearbox apparatus encapsulated subsequent to assembly in accordance with a fourth embodiment of the invention.
- figures 1 and 2 show a structural unit, in the form of a cylinder block which will subsequently form part of an internal combustion engine (not shown), encapsulated in a plastic foam matrix (encapsulant ) in a manner to be described and in accordance with the present invention.
- the cylinder block is cast to include one or more cylinder barrels 1, a top deck 2 to provide a mounting site for attaching a cylinder head (not shown), a coolant jacket flange 3, a crankshaft upper main bearing housing 4 and a crankcase 5.
- the crankcase 5 includes bearer facings 6 for attaching engine mountings (not shown) and a peripheral lower flange 7 for attaching a lubricating oil sump (not shown) .
- the cylinder block is cast as a structural unit devoid of any enclosures other than where these also have a structural function.
- the crankcase 5 is provided as an open casting unlike conventional crankcase castings which have a generally enclosing function.
- the crankoase casting provides the structural support function, and is equipped with mountings (eg. 6, 7) to this end, but excess cast material is not wasted on non-structural enclosures.
- a coolant jacket 11 is formed by suitably locating pre-formed skins 12 to define volumes between the skins and the cylinder barrel 1.
- the skins may be produced by a sheet moulding process, such as vacuum moulding, from a suitable thermoplastic resin such as ABS .
- At least one of the coolant gallery skins may include a blind coolant connection.
- a connection 13 is shown in Figure 1.
- the connection in this example is reinforced with a sleeve 14 and may be pierced following the subsequent encapsulation process (described below) . If the encapsulant is subsequently introduced to cover an end of the coolant connection or other conduit, a hole can be bored through the encapsulant and skin to connect with the coolant jacket.
- an oil pressure rail 16 is bonded into a groove 17 in a wall of the cylinder block and further components may similarly be positioned relative to the cylinder block before encapsulation. Examples are shown in Figure 1.
- a sensor unit 18 is bonded to the cylinder block with its connecting electrical cables 19 spaced apart from the cylinder block.
- a coolant conduit 21 is positioned adjacent to but spaced apart from the coolant jacket skin 12.
- Other components such as wiring harnesses, pipes, etc., may be included within the subsequent encapsulant both for a low cost and load distributing support and to provide an aesthetically clean-looking external appearance.
- a crankcase skin 22 is provided which may be formed by a sheet moulding process in a similar manner to the coolant jacket skin 12.
- the crankcase skin 22 defines a crankcase volume 23 from which it is desired to exclude encapsulant and provides a harder skin surface than the encapsulant.
- the crankcase skin may include stub pipes. Such pipes 24 are provided in the embodiment of Figure 1 to which are attached a breather tube 25 and a dipstick tube 26. In the figure, the dipstick tube 26 has been fitted with a temporary plug 27 to prevent encapsulant intrusion during the encapsulation stage (described below) .
- the structural unit assembly complete with skin mouldings 12, 22 is placed into a mould which, in the given example, is split vertically into mould halves 30a, 30b and has a mould cavity shaped to the required external shape of the encapsulated assembly.
- the shape of the mould cavity will permit the encapsulant 31 to generally enclose the structural unit assembly but will exclude the encapsulant from the interior volume of the unit, the upper face of the top deck 2 and the engine bearer facings 6.
- the encapsulant 31 a low-density plastic material, is poured or injected into the mould 30a, 30b to fill the remaining mould cavity.
- the result is a composite of a metallic structural skeleton and its accessories encapsulated within a low-density plastic body.
- the plastic body provides an enclosure and sealing function.
- the size and thermal inertia of the cast cylinder block will largely determine the selection of the low-density plastic material and the process specification. The selection will also depend upon the required function of the encapsulant, whether it be mainly an enclosure and interface seal or whether it will be required to possess specific noise and thermal attenuation properties.
- Multi -component liquid foam plastic processing involves pouring or injecting a chemical mixture into a mould where it reacts and expands to fill the mould cavity with thermosetting cellular plastic. Foams are blown with a gas such as C02 generated by the chemical action or by volatile liquids which are vaporised by the heat of reaction. Moulding pressures are low, typically 2 bar, permitting light and low-cost mould construction.
- Phenolic foams can have a specific gravity in excess of 1 down to 0,13 and can be toughened as well as reinforced with glass and other fibres. It is possible to include elastomeric nodules within the foam matrix which improves noise attenuation. As the foam expands within the mould cavity, it forms an intimate bond with the skeletal metal structure. Since some plastics utilise acidic catalysts, it may be necessary to pre-treat and protect the metal skeleton with a surface that promotes bonding with the foam. The differential expansion rates between the metal skeleton and the foam are accommodated by the relative flexibility of the foam.
- material performance improves during the curing process, which can be quite prolonged, perhaps up to 24 hours, and it may thus be important not to disturb the process.
- Some foam encapsulations and processes can produce a closed cell skin forming surface which is preferable since the friable nature of open cell surfaces may lead to particle break-off and contamination.
- the robustness of skin surfaces may be inadequate for some critical surfaces, in which case it may be helpful to introduce pre- formed plastic skins (not shown) into the mould cavity, the skins being of a construction similar to the coolant jacket and crankcase skins described above. Due to the low processing pressures involved, it is possible to place the moulded skins between the skeleton structure and the mould walls, thus the outside form or shape of the finished moulding will be that of the skin form or shape. In this way, undercut features may be produced without the need for complex moulds with loose pieces or moving walls.
- the foam plastic encapsulant will reduce radiated noise. Noise attenuation may be improved by special foam formulations employing elastomeric components.
- the encapsulant will also reduce thermal emissions, advantage of which can be taken in obtaining a faster warm-up of the built engine (not shown) in operation, particularly with regard to early exhaust catalyst and vehicle internal heater operation. Thermal insulation of the structural unit of the engine may also be of benefit where users of the built engines in operation may be in close proximity.
- the strength and impact resistance of the foam plastic encapsulant may not be sufficient where the walls of an engineering apparatus are required to provide a high degree of containment.
- highly stressed dynamic or reciprocating components may break during operation and impact the encapsulant.
- the embodiment of Figure 1 includes an optional additional feature to mitigate this, in the form of provision within the encapsulant of a mesh 35 of preferably, but not restrictively, metal in either expanded or wire form. This provides a degree of containment.
- the mesh will be in some respects better than a solid cast metal in this regard since it will tend to dissipate energy by deformation / elongation and may retain the broken component, whereas a cast wall may fracture, permitting the broken component to escape and produce a hole for fluids to follow.
- the advantages of a deformable structure also apply to external impacts.
- the mesh 35 has no structural function in the sense of contributing to the structural strength of the cylinder block in its role as a support means for the engine component . , and the mesh need not add unduly to the overall weight of the encapsulating part of the assembly.
- the mesh may further provide support to the encapsulant 31 both during the mould filling process and against applied dynamic and pressure loads. For instance, it may indirectly Support the coolant jacket skin 12 against the load resulting from pressurisation of the overall coolant system (not shown) .
- the engine is partly built-up before encapsulation to include, in this example, a crankshaft 40, pistons 41 and connecting rods 42.
- the required mechanical components and skins having been assembled to the structural unit, the unit is encapsulated in a similar manner to that described for the earlier embodiment by addition of encapsulation 48.
- Engine covers may be partly or fully included within the encapsulation, an example being a sump 43 as shown.
- the sump flange 47 of the sump 43 is secured to the crankcase lower flange 46 by conventional means (not shown) .
- the mould cavity may be shaped to permit the encapsulant 48 to generally enclose the sump to crankoase flanges 46, 47 as shown in the example figure.
- the encapsulant may enclose the whole of the sump. There may be no need to provide machined flanges since the encapsulant will provide a sealing function equivalent to, or better than, conventional flanged joints.
- a cylinder head (not shown) may be attached to the top deck subsequent to the encapsulation process. It would be possible to attach the cylinder head before encapsulation but encapsulation of the cylinder head could lead to difficulties in carrying out routine servicing where this might include, for instance, checking and adjusting valve clearances. Difficulties could also arise in respect of the high temperatures that a cylinder head can reach and the effect these may have on the encapsulant.
- the embodiment as described in which the engine is partly built up before encapsulation may be particularly relevant where the engine is configured to be non-serviceable; for example a low cost unit for which it would not be economical to extend the design life by remanufacture and which would not therefore require access to internal components subsequent to engine manufacture.
- the foam encapsulation concept is adapted for application to power transmission assemblies, for example a gearbox as shown in figure 4.
- a gearbox as shown in figure 4.
- an open rigid structural frame 50 is provided with shafts 51 carrying gears 52. The open nature of the frame 50 may significantly improve access for assembly of the gearbox when compared with conventional cast enclosures.
- the frame is provided with enclosure by encapsulation 53, with a skin 54 defining an enclosed cavity 55 from which the encapsulant is to be excluded, and the encapsulation 53 then being created by pouring or injecting into the cavity defined by a mould 56 in general accordance with the process and materials described in 5 respect of the foregoing embodiments.
- the present invention has been described by example for engines and gearboxes but may be applied to other engineering structures.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU50887/00A AU5088700A (en) | 1999-06-07 | 2000-06-05 | Encapsulated apparatus and method of manufacture |
GB0128330A GB2364551B (en) | 1999-06-07 | 2000-06-05 | Encapsulated cylinder block and gearbox casing assemblies |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9913182.3 | 1999-06-07 | ||
GB9913182A GB2350864A (en) | 1999-06-07 | 1999-06-07 | Containment and support assembly, eg for an engine or gearbox, with a rigid framework and lower density outer casing |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2000075498A1 true WO2000075498A1 (en) | 2000-12-14 |
WO2000075498A8 WO2000075498A8 (en) | 2001-03-01 |
Family
ID=10854861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2000/002016 WO2000075498A1 (en) | 1999-06-07 | 2000-06-05 | Encapsulated apparatus and method of manufacture |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU5088700A (en) |
GB (2) | GB2350864A (en) |
WO (1) | WO2000075498A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1607602A1 (en) * | 2004-06-01 | 2005-12-21 | KWD, AUTOMOTIVE GROUP GMBH & CO. KG | Composite case |
DE102016115526A1 (en) * | 2016-08-22 | 2018-02-22 | Volkswagen Aktiengesellschaft | Cylinder crankcase for an internal combustion engine with plastic housing and metal insert |
IT202000005560A1 (en) * | 2020-03-16 | 2021-09-16 | Bosch Gmbh Robert | PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL, TO AN INTERNAL COMBUSTION ENGINE |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19935335B4 (en) * | 1999-07-28 | 2009-04-02 | Basf Se | Encapsulation for internal combustion engines |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3133256A1 (en) * | 1981-08-22 | 1983-03-03 | Audi Nsu Auto Union Ag, 7107 Neckarsulm | Vehicle liquid-cooled internal combustion engine |
GB2140502A (en) * | 1983-05-25 | 1984-11-28 | Atomic Energy Authority Uk | An engine including fibre reinforced plastics |
GB2164702A (en) * | 1984-09-18 | 1986-03-26 | Ford Motor Co | An internal combustion engine cylinder block |
DE3606052A1 (en) * | 1986-02-25 | 1986-07-31 | Zikeli, Friedrich, Dipl.-Ing. (TH), 7300 Esslingen | Case parts and cover parts produced ready for installation from plastic moulding compositions for motor vehicle drive assemblies and combustion engines |
EP0860605A1 (en) * | 1997-02-22 | 1998-08-26 | Isuzu Motors Limited | Low-noise engine and its assembling method |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1007976A (en) * | 1962-01-26 | 1965-10-22 | Cav Ltd | Internal combustion engine constructions |
GB1448667A (en) * | 1972-09-02 | 1976-09-08 | Perkins Engines Ltd | Machine structure having means for reducing the level of noise emitted |
GB1587696A (en) * | 1977-07-29 | 1981-04-08 | Fiat Spa | Self-contained unit for the combined production of electrical energy and heat |
JPS5582593U (en) * | 1978-12-04 | 1980-06-06 | ||
JPS5624291A (en) * | 1979-08-02 | 1981-03-07 | Nissan Motor | Low noised engine |
DE3624986A1 (en) * | 1986-07-24 | 1988-02-04 | Focke & Co | MACHINE, PARTICULARLY PACKING MACHINE |
DE4027242A1 (en) * | 1990-08-29 | 1992-03-05 | Winter Fritz Eisengiesserei | CYLINDER BLOCK FOR MOTOR VEHICLE ENGINES |
US5370087A (en) * | 1993-09-28 | 1994-12-06 | The United States Of America As Represented By The Secretary Of The Navy | Low vibration polymeric composite engine |
FR2745034B1 (en) * | 1996-02-21 | 1998-04-03 | Coutier Moulage Gen Ind | SOUNDPROOF HOUSING FOR MOTORIZATION AND MANUFACTURING METHOD THEREOF |
-
1999
- 1999-06-07 GB GB9913182A patent/GB2350864A/en not_active Withdrawn
-
2000
- 2000-06-05 AU AU50887/00A patent/AU5088700A/en not_active Abandoned
- 2000-06-05 WO PCT/GB2000/002016 patent/WO2000075498A1/en active Application Filing
- 2000-06-05 GB GB0128330A patent/GB2364551B/en not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3133256A1 (en) * | 1981-08-22 | 1983-03-03 | Audi Nsu Auto Union Ag, 7107 Neckarsulm | Vehicle liquid-cooled internal combustion engine |
GB2140502A (en) * | 1983-05-25 | 1984-11-28 | Atomic Energy Authority Uk | An engine including fibre reinforced plastics |
GB2164702A (en) * | 1984-09-18 | 1986-03-26 | Ford Motor Co | An internal combustion engine cylinder block |
DE3606052A1 (en) * | 1986-02-25 | 1986-07-31 | Zikeli, Friedrich, Dipl.-Ing. (TH), 7300 Esslingen | Case parts and cover parts produced ready for installation from plastic moulding compositions for motor vehicle drive assemblies and combustion engines |
EP0860605A1 (en) * | 1997-02-22 | 1998-08-26 | Isuzu Motors Limited | Low-noise engine and its assembling method |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1607602A1 (en) * | 2004-06-01 | 2005-12-21 | KWD, AUTOMOTIVE GROUP GMBH & CO. KG | Composite case |
DE102016115526A1 (en) * | 2016-08-22 | 2018-02-22 | Volkswagen Aktiengesellschaft | Cylinder crankcase for an internal combustion engine with plastic housing and metal insert |
DE102016115526B4 (en) | 2016-08-22 | 2022-09-08 | Volkswagen Aktiengesellschaft | Cylinder crankcase for an internal combustion engine with plastic housing and metal insert |
IT202000005560A1 (en) * | 2020-03-16 | 2021-09-16 | Bosch Gmbh Robert | PUMPING GROUP TO FEED FUEL, PREFERABLY DIESEL, TO AN INTERNAL COMBUSTION ENGINE |
Also Published As
Publication number | Publication date |
---|---|
GB2364551B (en) | 2003-08-06 |
GB2364551A8 (en) | 2002-01-30 |
GB2364551A (en) | 2002-01-30 |
AU5088700A (en) | 2000-12-28 |
WO2000075498A8 (en) | 2001-03-01 |
GB0128330D0 (en) | 2002-01-16 |
GB9913182D0 (en) | 1999-08-04 |
GB2350864A (en) | 2000-12-13 |
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