GB2106612A - Vibration-isolating resilient interlayers - Google Patents
Vibration-isolating resilient interlayers Download PDFInfo
- Publication number
- GB2106612A GB2106612A GB08129109A GB8129109A GB2106612A GB 2106612 A GB2106612 A GB 2106612A GB 08129109 A GB08129109 A GB 08129109A GB 8129109 A GB8129109 A GB 8129109A GB 2106612 A GB2106612 A GB 2106612A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resilient
- vibration
- series
- isolating
- fastener members
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
- F16F1/371—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by inserts or auxiliary extension or exterior elements, e.g. for rigidification
Abstract
A vibration-isolating resilient interlayer in the form of an elastic gasket 10 for providing remote mounting of a sump to an under surface of an engine crankcase comprises an oil-resistant synthetic rubber gasket strip 12 having moulded therein spaced upper and lower metal strap members 14 and 16 provided with sets of welded-on lower and upper studs 28 and 22 respectively. Each set of the studs 28 and 22 extends from its strap member through respective clearance apertures 30, 24 in the other strap member, so avoiding a direct noise transmission contact path, and threaded free ends 32, 26 of the studs project from the opposite surfaces 20 and 18 of the gasket strip to provide for securement of the sump and crankcase respectively by means of attachment nuts. The studs may take the form of weld bolts, or weld bolts may alternate with shouldered bolts. The gasket may comprise separate resilient laminae bonded to the faces of metal strap members, (Figs. 7, 8, not shown). <IMAGE>
Description
SPECIFICATION
Vibration - isolating resilient interlayers
This invention relates to vibration - isolating resilient interlayers.
More particularly, the invention is concerned with vibration - isolating resilient interlayers for use in the interconnection of a pair of machine elements by means of a first and a second series of elongate fastener members engaging a first and a second of the machine elements respectively.
A specific application is in an engine crankcase and sump assembly, as a gasket providing an interconnection effective to isolate the sump from the crankcase and thereby achieve a reduction in noise during engine operation.
By the invention there is provided a vibration isolating resilient interlayer for use in the interconnection of a pair of machine elements by means of a first and a second series of elongate fastener members engaging a first and a second of the machine elements respectively, comprising, successively::
a first resilient layer adapted to be traversed by the fastener members of the first series and to isolate the first machine element from the fastener members of the second series and from a first continuous reinforcement layer;
a first continuous reinforcement layer as aforesaid provided with apertures adapted to be traversed with clearance by the fastener members of the first series and adapted to provide an anchorage for the fastener members of the second series;
a second resilient layer adapted to be traversed by the fastener members of the first and second series and to isolate the first continuous reinforcement layer from a second continuous reinforcement layer;;
a second continuous reinforcement layer as aforesaid adapted to provide an anchorage for the fastener members of the first series and provided with apertures adapted to be traversed with clearance by the fastener members of the second series; and
a third resilient layer adapted to be traversed by the fastener members of the second series and to isolate the second machine element from the fastener members of the first series and from the second continuous reinforcement layer.
Such a vibration - isolating resilient interlayer, when used in the interconnection of a pair of machine elements as aforesaid, can provided noise isolation between the machine elements, without any direct noise transmission contact path between the first and second series of fastener members.
In the specific application as a gasket interconnecting an engine crankcase and sump assembly, the the vibration - isolating resilient interlayer can provide remote mounting of the sump, and thus isolation of the sump from the crankcase, with the arrangement of continuous reinforcement layers within the resilient material, and the associated fastener members, eliminating the possibility ofthe sump falling off in the event of failure of the resilient gasket material.
The continuous reinforcement layers will, in the application as a gasket, comprise respective elongate strap-like members, which will usually extend parallel to opposed engagement faces of the gasket, that is, to its upper and lower surfaces. Mild pressing steel is a suitable material for the reinforcement layers.
Particularly in the application as a gasket for an engine crankcase and sump assembly, the resilient layers preferably comprise oil-resistant synthetic rubber, for example nitrile rubber. For other applications, other types of synthetic rubber, or natural rubber, may be used.
The resilient layers may together comprise an integral moulding within which continuous reinforcement layers are embedded. Alternatively, the resilient layers may comprise separate resilient laminae which are bonded to the faces of the respective reinforcement layers.
The fastener members may comprise studs welded or otherwise fixedly secured to the respective continuous reinforcement layers, with threaded end portions of the studs projecting from the engagement faces of the interlayer, for the reception of securing nuts. For example, the studs may comprise weld bolts, which are a standard item and have head portions provided with embossments which can form a welded connection to the respective reinforcement layerwhen a resistance welding electrode is brought into firm engagement with the heads of the weld bolts.
In some applications (for example in some engine crankcase and sump configurations), only limited access will be available for securement of the fastener members to connect the machine elements together, and for such applications one series of fastener members may comprise studs fixedly secured to the respective continuous reinforcement layer and the other series of fastener members may comprise bolts. With such an arrangement, access is needed to only one face of the interlayerforfixing purposes, for the application of securing nuts to threaded free end portions of the studs, and for insertion of the bolts into apertures in the interlayer provided for this purpose, and tightening of the bolts into threaded apertures (which may for example be blind bores) in one of the machine elements, for example in a peripheral rim portion of the engine crankcase.Recesses will be required in one of the resilient layers to accommodate the heads of the bolts.
Overtightening of the fastener members should be avoided, to prevent undue compression of the resilient layers. Thus for an engine crankcase and sump assembly, limiting the torque to about 11 Nm (81bs. ft.) will provide an effective connection and a good seal without excessive compression of the resilient layers.
Another way of preventing undue compression of the resilient layers is by the use of shouldered bolts, which have a cylindrical body portion provided at one axial end with a polygonal head and at the other axial end with a threaded end portion of lesser diameter than the body portion, whereby the axial length of the body portion establishes a specific spacing distance which cannot be reduced no matter how hard the shouldered bolt is tightened down.
In the accompanying drawings:
Figure I is a fragmentary cross-section, including some parts in elevation, illustrating one embodiment of a vibration - isolating resilient interlayer in accordance with the present invention, in the form of an elastic gasket for an engine crankcase and sump assembly and
Figures 2 and 3 are fragmentary cross-sections, including some parts in elevation, illustrating the attachment of the elastic gasket shown in Figure 1 to an engine crankcase and a sump;
Figure 4 is a fragmentary cross-section, including some parts in elevation, illustrating another embodiment of a vibration - isolating resilient interlayer in accordance with the present invention, in the form of an elastic gasket, and including a shouldered bolt;;
Figures 5 and 6 are fragmentary cross-sections, including some parts in elevation, illustrating the attachment of the elastic gasket shown in Figure 4 to an engine crankcase and sump permitting access only from the underside; and
Figures 7 and 8 are views similar two Figures 5 and 6 but of an embodiment of a vibration - isolating resilient interlayer in accordance with the present invention, again in the form of an elastic gasket, in which separate resilient laminae are bonded to the faces of a pair of metal reinforcements layer.
As is shown in Figure 1 of the drawings, a vibration - isolating resilient interlayer in accordance with the present invention, in the form of an elastic gasket 10 for an engine crankcase and sump, comprises a planar closed strip 12 of elastomeric material, specifically oil-resistant (nitrile) synthetic rubber, which as seen in plan has the shape generally of a hollow rectangle, with spaced upper and lower elongate metal members constituted by planar straps 14 and 16 made of mild pressing steel and moulded integrally into the elastomeric material and extending parallel to the upper and lower surfaces 18 and 20 of the strip.
A line of metal studs 22 (upper studs) is welded to the upper surface of the lower strap 16: these studs extend vertically upwardly through clearance holes 24 in the upper strap 14, with threaded free end portions 26 of the studs projecting clear of the upper surface 18 of the gasket strip 12.
Conversely, a line of metal studs 28 (lower studs) is welded to the lower surface of the upper strap 14: these studs extend vertically downwardly, through clearance holes 30 in the lower strap 16, with threaded free end portions 32 of the studs projecting clear of the lower surface 20 of the gasket strip 12.
The upper and lower straps and studs are thus embedded in the elastomeric material of the gasket without any metal-to-metal contact path between the upper and lower studs.
For remote mounting of a sump 34 on the under surface of an engine crankcase 36, as is illustrated in
Figures 2 and 3, the elastic gasket 10 is located between the sump and the crankcase with the studs 28 extending downwardly through respective apertures 38 in a rim portion 40 of the sump, and the sump is secured by applying respective nuts 42 to the threaded end portions 32, with the interposition of washers 44, and the studs 22 extending upwardly through respective apertures 46 in a flange portion 48 of the crankcase are secured by respective nuts 50 applied to the threaded end portions 26, with the interposition of washers 52.
In the resulting assembly, the elastomeric material between the upper and lower straps is maintained in moderate compression, and the elastic gasket provides for adequate mounting and sealing of the sump to the engine crankcase, together with noise isolation.
Figures 4 to 6 of the drawings illustrate an embodiment of a vibration - isolating resilient interlayer in accordance with the present invention, and the interconnection thereby of an engine crankcase and a sump, which is similar to the embodiment shown in Figures 1 to 3, and the parts which are like or similarto those in the Figure 1 to 3 embodiment are denoted by like reference numerals but primed.
In the embodiment shown in Figures 4 to 6, weld bolts 28' have head portions 54 resistance-welded to the upper surface of metal strap 14', with shank portions of the weld bolts extending by way of respective apertures in the strap 14' and through clearance holes 30' in metal strap 16' to terminate clear of lower surface 20' of gasket,0' in threaded free end portions 32'. Respective nuts 42' with associated washers 44' applied to the threaded end portions 32' provide a connection to sump 34'.
Arranged alternately with the weld bolts 28' are shouldered bolts 55 each comprising a cylindrical body portion 56 provided at one end with a hexagonal head 58 and at the other end with an axially extending threaded end portion 60 of lesser diameter than the body portion, whereby the end face of the body portion forms an annular shoulder 62.
The shouldered bolts 55 are received in through clearance apertures 64 in the gasket, with the hexagonal heads 58 accommodated in oversize recesses 66 in the resilient material of the interlayer, permitting insertion of a spanner for tightening the threaded end portion 60 into a corresponding blind bore 68 in a flanged rim portion forming the outer periphery of engine crankcase 36'.
The body portions 56 of the shouldered bolts in effect act as spacers establishing a minimum axial dimension between the under surface of the metal strap 16' and the upper surface (engagement surface) 18' of the resilient material of the gasket, thus avoiding over-compression of the gasket at these regions. The nuts on the weld bolts are tightened just sufficiently to support the weight of the sump and provide a good fluid seal.
Figures 7 and 8 of the drawings illustrate a modification of the Figure 5 and 6 embodiment, with weld bolts 28" and shouldered bolts 55" as in the
Figure 5 and 6 embodiment but with the gasket itself in the form of separate resilient laminae 70,72 and 74 bonded to the faces of full-width strap-like reinforcement layers 76 and 78 made of mild pressing steel.
The embodiments of an elastic gasket which have been described meet an overall objective of:
1) providing a connection between two parts;
2) providing a fluid seal between the parts;
3) providing noise isolation between the parts by interposition of resilient material; and
4) providing for maintenance of the connection should the resilient material fail.
Specifically, in the engine crankcase and sump assemblies which have been described, the remote mounting of the sump achieved by the interposition of the elastic gasket provides vibration and noise isolation of the sump from the crankcase, without any metal-to-metal contact path, and the arrangement of metal straps moulded or laminated into the resilient material of the gasket, in conjunction with the connecting studs or bolts, eliminates the possibility of the sump falling off in the event of failure of the resilient material of the gasket.
Claims (14)
1. A vibration - isolating resilient interlayer for use in the interconnection of a pair of machine elements by means of a first and a second series of elongate fastener members engaging a first and a second of the machine elements respectively, comprising, successively:
a first resilient layer adapted to be traversed by the fastener members of the first series and to isolate the first machine element from the fastener members of the second series and from a first continuous reinforcement layer;
a first continuous reinforcement layer as aforesaid provided with apertures adapted to be traversed with clearance by the fastener members of the first series and adapted to provide an anchorage for the fastener members of the second series;;
a second resilient layer adapted to be traversed by the fastener members of the first and second series and to isolate the first continuous reinforcement layer from a second continuous reinforcement layer;
a second continuous reinforcement layer as aforesaid adapted to provide an anchorage for the fastener members of the first series and provided with apertures adapted to be traversed with clearance by the fastener members of the second series; and
a third resilient layer adapted to be traversed by the fastener members of the second series and to isolate the second machine element from the fastener members of the first series and from the second continuous reinforcement layer.
2. A vibration - isolating resilient interlayer according to claim 1, in the form of a gasket, in which the first and second continuous reinforcement layers comprise respective elongate strap-like members extending parallel to opposed engagement faces of the gasket.
3. A vibration - isolating resilient interlayer according to claim 1 or 2, in which the first and second continuous reinforcement layers comprise mild pressing steel.
4. A vibration - isolating resilient interlayer according to any one of claims 1 to 3, in which the first, second and third resilient layers comprise oil-resistant synthetic rubber, for example nitrile rubber.
5. A vibration - isolating resilient interlayer according to any one of claims 1 to 4, in which the first, second and third resilient layers together comprise an integral moulding within which the first and second continuous reinforcement layers are embedded.
6. A vibration - isolating resilient interlayer according to any one of claims 1 to 4, in which the first, second and third resilient layers comprise separate resilient laminae bonded to faces of the respective reinforcement layers.
7. A vibration - isolating resilient inter-layer according to any one of claims 1 to 6, in which the first and second series of elongate fastener members comprise studs fixedly secured to the respective continuous reinforcement layers and having threaded end portions projecting from opposed engagement faces of the first and third resilient layers respectively.
8. A vibration - isolating resilient interlayer according to claim 7, in which the studs comprise weld bolts having head portions welded to the respective reinforcement layer.
9. A vibration - isolating resilient interlayer according to any one of claims 1 to 6, in which the second series of elongate fastener members comprise studs fixedly secured to the first continuous reinforcement layer and having threaded end portions projecting from an engagement face of the third resilient layer, and, to permit the use of shouldered bolts as the first series of elongate fastener members, each such shouldered bolt comprising a cylindrical body portion provided at one axial end with a polygonal head and at the other axial end with a threaded end portion of lesser diameter than the body portion, the third resilient layer is formed with recesses to accommodate the head portions of the respective shouldered bolts, and the other layers are formed to provide a through aperture for the body portion of the shouldered bolt, with at least the first continuous reinforcement layer being adapted to be traversed with clearance by the body portion ofthe shouldered bolt.
10. A vibration - isolating resilient interlayer according to any one of claims 1 to 9, forming a connection between first and second machine elements by means of a first and second series of elongate fastener members as aforesaid engaging the respective machine elements.
11. A vibration - isolating resilient interlayer according to claim 10, in which the first and second machine elements comprise an engine crankcase and a sump, with the vibration - isolating resilient interlayer in the form of a gasket between peripheral portions of the engine crankcase and sump.
12. A vibration - isolating resilient interlayer substantially as hereinbefore particularly described and as shown in Figures 1 to 3 of the accompanying drawings.
13. A vibration isolating resilient interiayer sub- stantially as hereinbefore particularly described and as shown in Figures 4 to 6 of the accompanying drawings.
14. A vibration - isolating resilient interlayer substantially as herein before particularly described and as shown in Figures 7 and 8 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08129109A GB2106612B (en) | 1981-09-25 | 1981-09-25 | Vibration-isolating resilient interlayers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08129109A GB2106612B (en) | 1981-09-25 | 1981-09-25 | Vibration-isolating resilient interlayers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2106612A true GB2106612A (en) | 1983-04-13 |
| GB2106612B GB2106612B (en) | 1985-01-09 |
Family
ID=10524762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08129109A Expired GB2106612B (en) | 1981-09-25 | 1981-09-25 | Vibration-isolating resilient interlayers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2106612B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0124069A2 (en) * | 1983-04-29 | 1984-11-07 | Metzeler Kautschuk Gmbh | Mounting unit, particularly for mounting the engine of a motor vehicle |
| EP1329613A1 (en) * | 2002-01-18 | 2003-07-23 | Bayer Aktiengesellschaft | Acoustic baffle |
| EP1393982A1 (en) * | 2002-08-28 | 2004-03-03 | Carcoustics Tech Center GmbH | Sound-damping accessory for vehicles |
| CN108361305A (en) * | 2018-02-13 | 2018-08-03 | 宋帆 | A kind of vibration and noise reducing device of blocking type structure |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104455196B (en) * | 2014-09-30 | 2016-06-01 | 西安空间无线电技术研究所 | A kind of rigidity tunable arrangement with heat conduction, conduction, high damping characteristic |
-
1981
- 1981-09-25 GB GB08129109A patent/GB2106612B/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0124069A2 (en) * | 1983-04-29 | 1984-11-07 | Metzeler Kautschuk Gmbh | Mounting unit, particularly for mounting the engine of a motor vehicle |
| EP0124069A3 (en) * | 1983-04-29 | 1986-08-06 | Metzeler Kautschuk Gmbh | Mounting unit, particularly for mounting the engine of a motor vehicle |
| EP1329613A1 (en) * | 2002-01-18 | 2003-07-23 | Bayer Aktiengesellschaft | Acoustic baffle |
| US6666297B2 (en) | 2002-01-18 | 2003-12-23 | Bayer Aktiengesellschaft | Acoustic shielding article |
| EP1393982A1 (en) * | 2002-08-28 | 2004-03-03 | Carcoustics Tech Center GmbH | Sound-damping accessory for vehicles |
| CN108361305A (en) * | 2018-02-13 | 2018-08-03 | 宋帆 | A kind of vibration and noise reducing device of blocking type structure |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2106612B (en) | 1985-01-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 20010924 |