GB2094948A - Sound deadening - Google Patents
Sound deadening Download PDFInfo
- Publication number
- GB2094948A GB2094948A GB8107922A GB8107922A GB2094948A GB 2094948 A GB2094948 A GB 2094948A GB 8107922 A GB8107922 A GB 8107922A GB 8107922 A GB8107922 A GB 8107922A GB 2094948 A GB2094948 A GB 2094948A
- Authority
- GB
- United Kingdom
- Prior art keywords
- layer
- zinc
- polysulphide
- article
- rubber
- 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.)
- Withdrawn
Links
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 34
- 239000011701 zinc Substances 0.000 claims abstract description 34
- 229910052751 metal Inorganic materials 0.000 claims abstract description 33
- 239000002184 metal Substances 0.000 claims abstract description 33
- 229920001971 elastomer Polymers 0.000 claims abstract description 32
- 229920001021 polysulfide Polymers 0.000 claims abstract description 28
- 239000004411 aluminium Substances 0.000 claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229920001821 foam rubber Polymers 0.000 claims abstract description 16
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 11
- 239000000956 alloy Substances 0.000 claims abstract description 11
- 238000002485 combustion reaction Methods 0.000 claims abstract description 7
- 229920005830 Polyurethane Foam Polymers 0.000 claims abstract description 5
- 229920002323 Silicone foam Polymers 0.000 claims abstract description 5
- 239000011496 polyurethane foam Substances 0.000 claims abstract description 5
- 239000013514 silicone foam Substances 0.000 claims abstract description 5
- 238000005507 spraying Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 229910001018 Cast iron Inorganic materials 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 239000000470 constituent Substances 0.000 claims description 2
- 238000013016 damping Methods 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims description 2
- 229920003225 polyurethane elastomer Polymers 0.000 claims description 2
- 229920002379 silicone rubber Polymers 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 239000013585 weight reducing agent Substances 0.000 claims description 2
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
- F02B77/13—Acoustic insulation
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
- G10K11/168—Plural layers of different materials, e.g. sandwiches
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Laminated Bodies (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Articles such as timing covers for internal combustion engines are given a sound deadening treatment by applying a polysulphide, silicone or polyurethane foam rubber layer to the surface of the article and spraying a layer of zinc, aluminium or ferrous metal or their alloys onto said rubber layer. Both the foam rubber and the metal layers may be sprayed on. Preferably, a polysulphide foam rubber layer 5 to 10 m.m. thick is applied followed by a zinc metal layer 1.5 to 2.0 m.m. thick.
Description
SPECIFICATION
Sound-deadening
This invention relates to the sound-deadening of articles such as covers for closing apertures on internal combustion engines.
In our United Kingdom patent application number 2052020 we disclosed a sounddeadening treatment for an article that involves applying a layer of zinc, aluminium or ferrous rubber layer to the surface of the article and applying a layrer of zinc, aluminium or ferrous metal or their alloys to the rubber layer. The sound-deadening action involved is that of constrained layer damping and the thicknesses of the rubber and metal layers are optimised using the known theory.
The preferred materials used are polysulphide rubber and zinc, and these are sprayed on.
Typically, for an engine timing cover, the optimum thickness of the polysulphide rubber is 0.5 to 1 .Omm and the optimum thickness of the zinc is 3.0 to 4.0mm for a cast aluminium cover and 1.5 to 2.0mm for a pressed steel cover.
An object of the present invention is to reduce the cost and weight of this sound-deadening coating whilst maintaining or improving the sound-deadening properties.
This is achieved according to the present invention by arranging that said polysulphide, silicone or polyurethane rubber layer has a foamed structure so as to reduce its stiffness and thereby isolate the outer metal layer from vibration of the article to improve sound-deadening. The sounddeadening action is thus changed to that of an isolation technique in which a reduction in the mass of the metal layer can be offset by a reduction in the stiffness of the rubber layer. The mass of the metal layer and stiffness of the rubber layer determine the resonant frequency of the sound-deadening coating, which is kept below the frequencies to be damped.
The foamed structure can be readily achieved by means of an additive in the rubber material that produces a gas generating reaction. With a sprayed on rubber layer the gas may be produced by a reaction between two constituents that are mixed in the spray gun immediately prior to spraying.
Typically, the foamed polysulphide has a closed cell structure with a density of 400 kg/m3 and a modulus of elasticity of 1 50 1 < N/m2. For an aluminium engine timing cover the foamed polysulphide rubber layer is typically 5 to 1 Omm thick and the zinc layer 1.5 to 2.0mm thick.
The use of foamed polysulphide in place of the non-foamed polysulphide thus allows a halving of the thickness of zinc and a corresponding cost and weight saving. The cost saving is especially significant bearing in mind that the zinc is by far the major contributor to material costs. Also, it will be appreciated that the weight reduction makes this sound-deadening treatment more acceptable in those applications where weight is especially critical. For example, cast iron engine components require a greater thickness of metal in the coating as compared with aluminium components, and a reduction in this thickness can avoid what would otherwise be an unacceptable weight penalty.
1. A method of sound deadening articles comprising applying a polysulphide, silicone or polyurethane foam rubber layer to the surface of the article and spraying a layer of zinc, aluminium or ferrous metal or their alloys onto said rubber layer.
2. A method as claimed in claim 1 in which a zinc metal layer is sprayed onto a polysulphide foam rubber layer.
3. A method as claimed in claim 2 in which the polysulphide foam rubber is a layer 5 to 1 Omm thick and zinc metal layer is 1.5 to 2.0mm thick.
4. A method as claimed in claim 1 in which a layer of zinc metal is sprayed onto said foam
rubber layer and aluminium or ferrous metal or its alloy is sprayed onto the zinc.
5. A method as claimed in any one of the preceding claims in which the layer of zinc, aluminium or ferrous metal or their alloys is sprayed onto said foam rubber layer before the latter has fully cured.
6. A method as claimed in any one of the preceding claims in which the foam rubber is sprayed on.
7. A method as claimed in any one of the preceding claims in which the article is a cover for an internal combustion engine.
8. An article provided with a sound deadening coating comprising a layer of polysulphide, silicone or polyurethane foam rubber applied to the surface of the article and a layer of zinc, aluminium or ferrous metal or their alloys sprayed onto said rubber layer.
9. An article as claimed in claim 8 in which said layer of rubber comprises a layer of polysulphide foam rubber 5 to 1 Omm thick.
10. An article as claimed in claim 9 in which a layer of zinc metal is sprayed onto said polysulphide foam rubber.
1 An article as claimed in claim 10 in which said zinc metal layer is 1.5 to 2.0mm thick.
12. An article as claimed in any one of claims 8 to 11 which is a cover for an internal combustion engine.
13. A method of sound deadening an article as claimed in claim 1 and substantially as herein described.
14. An article provided with a sound deadening coating as claimed in claim 8 and substantially as herein described.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (14)
1. A method of sound deadening articles comprising applying a polysulphide, silicone or polyurethane foam rubber layer to the surface of the article and spraying a layer of zinc, aluminium or ferrous metal or their alloys onto said rubber layer.
2. A method as claimed in claim 1 in which a zinc metal layer is sprayed onto a polysulphide foam rubber layer.
3. A method as claimed in claim 2 in which the polysulphide foam rubber is a layer 5 to 1 Omm thick and zinc metal layer is 1.5 to 2.0mm thick.
4. A method as claimed in claim 1 in which a layer of zinc metal is sprayed onto said foam
rubber layer and aluminium or ferrous metal or its alloy is sprayed onto the zinc.
5. A method as claimed in any one of the preceding claims in which the layer of zinc, aluminium or ferrous metal or their alloys is sprayed onto said foam rubber layer before the latter has fully cured.
6. A method as claimed in any one of the preceding claims in which the foam rubber is sprayed on.
7. A method as claimed in any one of the preceding claims in which the article is a cover for an internal combustion engine.
8. An article provided with a sound deadening coating comprising a layer of polysulphide, silicone or polyurethane foam rubber applied to the surface of the article and a layer of zinc, aluminium or ferrous metal or their alloys sprayed onto said rubber layer.
9. An article as claimed in claim 8 in which said layer of rubber comprises a layer of polysulphide foam rubber 5 to 1 Omm thick.
10. An article as claimed in claim 9 in which a layer of zinc metal is sprayed onto said polysulphide foam rubber.
1 An article as claimed in claim 10 in which said zinc metal layer is 1.5 to 2.0mm thick.
12. An article as claimed in any one of claims 8 to 11 which is a cover for an internal combustion engine.
13. A method of sound deadening an article as claimed in claim 1 and substantially as herein described.
14. An article provided with a sound deadening coating as claimed in claim 8 and substantially as herein described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8107922A GB2094948A (en) | 1981-03-13 | 1981-03-13 | Sound deadening |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8107922A GB2094948A (en) | 1981-03-13 | 1981-03-13 | Sound deadening |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2094948A true GB2094948A (en) | 1982-09-22 |
Family
ID=10520358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8107922A Withdrawn GB2094948A (en) | 1981-03-13 | 1981-03-13 | Sound deadening |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2094948A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0410078A1 (en) * | 1989-07-24 | 1991-01-30 | H.P. Chemie Pelzer Research & Development Ltd. | Sound absorption for the oil sump of a motor vehicle and method for its mounting |
| EP0860605A1 (en) * | 1997-02-22 | 1998-08-26 | Isuzu Motors Limited | Low-noise engine and its assembling method |
| WO2000052681A1 (en) * | 1999-03-02 | 2000-09-08 | Faist Automotive Gmbh & Co. Kg | Component part which absorbs or deadens sound according to the spring-mass system, method for the production thereof and its use |
| US6769510B2 (en) * | 2002-07-15 | 2004-08-03 | Pacific Industrial Co., Ltd. | Engine cover |
| WO2004111487A1 (en) * | 2003-06-11 | 2004-12-23 | Sika Technology Ag | Constrained layer damper |
| US20160123225A1 (en) * | 2013-06-04 | 2016-05-05 | Basf Se | Thermal insulation of an internal combustion engine |
-
1981
- 1981-03-13 GB GB8107922A patent/GB2094948A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0410078A1 (en) * | 1989-07-24 | 1991-01-30 | H.P. Chemie Pelzer Research & Development Ltd. | Sound absorption for the oil sump of a motor vehicle and method for its mounting |
| EP0860605A1 (en) * | 1997-02-22 | 1998-08-26 | Isuzu Motors Limited | Low-noise engine and its assembling method |
| EP1270927A1 (en) * | 1997-02-22 | 2003-01-02 | Isuzu Motors Limited | Low-noise engine |
| WO2000052681A1 (en) * | 1999-03-02 | 2000-09-08 | Faist Automotive Gmbh & Co. Kg | Component part which absorbs or deadens sound according to the spring-mass system, method for the production thereof and its use |
| US6769510B2 (en) * | 2002-07-15 | 2004-08-03 | Pacific Industrial Co., Ltd. | Engine cover |
| WO2004111487A1 (en) * | 2003-06-11 | 2004-12-23 | Sika Technology Ag | Constrained layer damper |
| US7186442B2 (en) | 2003-06-11 | 2007-03-06 | Sika Technology Ag | Constrained layer damper |
| US20160123225A1 (en) * | 2013-06-04 | 2016-05-05 | Basf Se | Thermal insulation of an internal combustion engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |