GB2049483A - An injection valve for injection systems - Google Patents
An injection valve for injection systems Download PDFInfo
- Publication number
- GB2049483A GB2049483A GB8010265A GB8010265A GB2049483A GB 2049483 A GB2049483 A GB 2049483A GB 8010265 A GB8010265 A GB 8010265A GB 8010265 A GB8010265 A GB 8010265A GB 2049483 A GB2049483 A GB 2049483A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coating
- injection valve
- injection
- glow
- valve according
- 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- Withdrawn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
- 238000002347 injection Methods 0.000 title claims abstract description 26
- 239000007924 injection Substances 0.000 title claims abstract description 26
- 238000000576 coating method Methods 0.000 claims abstract description 36
- 239000011248 coating agent Substances 0.000 claims abstract description 35
- 229920000642 polymer Polymers 0.000 claims abstract description 7
- 238000002485 combustion reaction Methods 0.000 claims abstract description 3
- 229930195733 hydrocarbon Natural products 0.000 claims description 7
- 150000002430 hydrocarbons Chemical class 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- UQEAIHBTYFGYIE-UHFFFAOYSA-N hexamethyldisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)C UQEAIHBTYFGYIE-UHFFFAOYSA-N 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 239000000178 monomer Substances 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- -1 silicon organic compounds Chemical class 0.000 claims 3
- RKIMETXDACNTIE-UHFFFAOYSA-N 1,1,2,2,3,3,4,4,5,5,6,6-dodecafluorocyclohexane Chemical compound FC1(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C1(F)F RKIMETXDACNTIE-UHFFFAOYSA-N 0.000 claims 1
- YCBPKOZNGFQMPB-UHFFFAOYSA-N 1,1,2,3,3,4,4,5,5,6,6,7,7,8,8,8-hexadecafluorooct-1-ene Chemical compound FC(F)=C(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F YCBPKOZNGFQMPB-UHFFFAOYSA-N 0.000 claims 1
- 230000004913 activation Effects 0.000 claims 1
- 239000000539 dimer Substances 0.000 claims 1
- 150000002736 metal compounds Chemical class 0.000 claims 1
- AFFLGGQVNFXPEV-UHFFFAOYSA-N n-decene Natural products CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 claims 1
- BCCOBQSFUDVTJQ-UHFFFAOYSA-N octafluorocyclobutane Chemical compound FC1(F)C(F)(F)C(F)(F)C1(F)F BCCOBQSFUDVTJQ-UHFFFAOYSA-N 0.000 claims 1
- 235000019407 octafluorocyclobutane Nutrition 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 claims 1
- 239000010703 silicon Substances 0.000 claims 1
- 238000009498 subcoating Methods 0.000 claims 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 235000010269 sulphur dioxide Nutrition 0.000 abstract description 2
- 239000004291 sulphur dioxide Substances 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 4
- 229910000423 chromium oxide Inorganic materials 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000012298 atmosphere Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- KEQXNNJHMWSZHK-UHFFFAOYSA-L 1,3,2,4$l^{2}-dioxathiaplumbetane 2,2-dioxide Chemical compound [Pb+2].[O-]S([O-])(=O)=O KEQXNNJHMWSZHK-UHFFFAOYSA-L 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/62—Plasma-deposition of organic layers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/166—Selection of particular materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2506/00—Halogenated polymers
- B05D2506/10—Fluorinated polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2518/00—Other type of polymers
- B05D2518/10—Silicon-containing polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Vapour Deposition (AREA)
- Fuel-Injection Apparatus (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
A valve for injection systems of combustion engines, especially with exhaust gas recirculation, is proposed which has a lyophobic polymer coating for the prevention of corrosive deposits. Thereby, water vapour and sulphur dioxide from the exhaust gas recirculation can no longer form deposits in the metering passage of the valve and a uniform composition of the injection mixture is guaranteed.
Description
SPECIFICATION
An injection valve for injection systems
The invention concerns an injection valve according to the preamble of the main claim.
With injection systems for combustion engines with exhaust gas recirculation, it has been established that, in the course of time, a depletion of the fuel in the injection mixture occurs which finally leads to the failure of the injection valve. Further experiments have shown the following: during the exhaust gas recirculation, the induction air is admixed with water vapour and sulphur dioxide.
Due to the considerable adhesion force between steel and water, a corrosive condensate is formed overall areas of the injection valve which are reachable by the fuel and the suction pipe atmosphere. The corrosion products and lead sulphate deposits from the remaining fuel, lead to a gradual narrowing of the metering passage of the injection valve and thus produce a mixture composition which is more deficient in fuel.
Starting from there, the object of the present invention is to prevent the development of such deposits on the endangered surfaces of the injection valve.
Advantages of the invention
Due to the inventive formation of the valve in accordance with the characterising of the main claim, the previously prevailing adhesion forces between the condensate products of the suction pipe atmosphere and the injection valve are removed and the formation of deposits prevented. In addition, the endangered surfaces of the injection valve are protected against corrosion.
Preferably further developments of the inventive concept are to be found in the sub-claims. Moreover, the initial monomers set forth in claim 4 for the production of the coating, have the special advan tageofa relatively high growth rate with good coating properties.
If an especially high value of corrosion protection is important, then the features of claim 5 are recommended.
The features of claim 6 offer the advantage that, without having to fear internal stresses in the layer, a relatively thick (1.2 Ftm) sub-layer can be produced, which due to its thickness, is absolutely pore-free, whereas a thin coating of about 0.3 itm is sufficient for the outer layer, which has the desired good hydrophobic properties.
Essential method features for the application of the coating are set forth in claims 7 to 9.
Further features of the invention will become apparent from the following description of the embodiments.
DESCRIPTION OF THE EMBODIMENTS
Example I
A glow polymer layer of, for example, hexamethyldisiloxane is applied to the metal surface of the injection valve in three steps. First of all, the metal surfaces is cleaned by a glow discharge in pure oxygen at about 5 x 10.2 mbars and is activated by adsorption of oxygen. Then, the monomer to be cross-linked is introduced to the prevailing oxygen at about the same partial pressure in the containers, whereby the gas discharge remains effective. In this phase, a polymer coating is formed on the metal which, due to the production of oxygen atoms, remains reactive and has good adhesion to the metal surface. Thus, such coatings are usually lyophilic.
Finally, the supply of oxygen is shut off and the lyophobic, chemically inert polymer coating can grow to the desired thickness at a pressure of about 10.1 mbars. This coating then effectively overcomes the adhesion forces of the valve surface with respect to the condensate and also protects against corrosion.
The coating thickness necessary for an effective protection, definitely depends on the roughness of the surface of the metal substrate. The thickness is preferably m1um.
Example 1k First of all, the valve is thoroughly cleaned and is then subjected to a preliminary glowing for activating the surface. The glow discharge takes place in the presence of oxygen or argon or nitrogen. The coating with perfluorinated hydrocarbons takes place art a high frequency flow discharge at about 1 mbar monomer gas pressure and with current densities between 0.5 and 4 mA/cm2.
Example Ill: First of all, a metal oxide-metal-metal oxide coating of about 0.5ym thick is applied to the valve in a firmly adhesive manner by reactive vapour deposition. Preferably, chromium is used as a metal coating wherein the 02 partial pressure during vapour deposition is so adjusted that an approximately 50 nm thick chromium oxide coating is produced. By a continuous feedback control of the 02 partial pressure, the oxide content in the coating reduces and a chromium coating about 0.35m thick is vapour deposited on which there then exists a chromium oxide coating about 0.1 !lem thick as a result of a fresh supply of 02. Thereby, the cheap, easily machinable standard steel is effectively protected against corrosion.Finally, the lyophobic glow polymer coating which is separated from hexamethyldisiloxane at a working pressure of about 1 of1, is applied to this multi-layer coating. Its adhesion to the chromium oxide coating is produced by 2 bridges the concentration of which is controlled by the adjusted 2 partial pressure during the separation, wherein the chromium oxide surface is preferably activated in a pure 2 atmosphere before the separation by glowing.
Example IV:
By preliminary glowing in, for example, an argon atmosphere, the valencies at the surface of the valve are induced in orderto prepare the surface for the adhesive connection with the coating to be applied.
The coating consists of a substantially 1.2jim thick glow coating of hydrocarbon or, which is especially preferably, or hexamethyldisiloxane which forms an absolutely pore-free corrosion resistant outer layer and from a glow coating applied therefrom of perfluorinated hydrocarbon of high molecular weight whereby the desired lyophobic properties are produced.
Claims (11)
1. An injection valve for injection systems of combustion engines, especially with exhaust gas recirculation, characterised in that, at least in the region of its metering passage, the valve has a lyophobic coating of a polymer coating.
2. An injection valve according to claim 1 characterised in that it is a question of a glow polymer coating.
3. An injection valve according to claim 1 or 2 characterised in that silicon organic compounds such as hexamethyldisiloxane or fluorinated hydrocarbons such as tetrafluorethylene, serve as starting monomers for the coating.
4. An injection valve according to claim 1 or 2 characterised in that perfluorinated hydrocarbons of high molecular weight, especially perfluorocyclo hexane, perfluorpropylene, perfluorocyclobutane, perfluorooctene or decene or perfluorpropylene dimers ortrimers.
5. An injection valve according to one of claims 1 to 4 characterised in that the coating is combined with a sub-coating, if necessary multi-layer, of vapour deposited metal compounds.
6. An injection valve according to one of claims 1 to 4 characterised in that the coating consists of a sub glow coating of hexamethyldisiloxane or hydrocarbons and an outer glow coating of perfluorinated hydrocarbons.
7. A method of applying the coating for injection valves according to claims 1 to 6, characterised in that, the surface of the valve is cleaned and activated before coating.
8. A method according to claim 7 characterised in that the surface activation takes place by glow discharge in oxygen, argon or nitrogen at a pressure of about 10.1 mbars.
9. A method according to claims 7 or 8 characterised in that the application of the coating takes place in a high frequency glow discharge at about 1 mbar and with a current density between 0.5 and 4 mA/cm2.
10. An injection valve substantially as herein described.
11. A method of applying a coating on an injection valve substantially as herein described.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792918598 DE2918598A1 (en) | 1979-05-09 | 1979-05-09 | INJECTION VALVE FOR INJECTION PUMPS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2049483A true GB2049483A (en) | 1980-12-31 |
Family
ID=6070258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8010265A Withdrawn GB2049483A (en) | 1979-05-09 | 1980-03-27 | An injection valve for injection systems |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS55151160A (en) |
| DE (1) | DE2918598A1 (en) |
| FR (1) | FR2456225A1 (en) |
| GB (1) | GB2049483A (en) |
| IT (1) | IT1131462B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0092230A2 (en) * | 1982-04-21 | 1983-10-26 | Siemens Aktiengesellschaft | Method of producing a lyophobic coating |
| WO2007036426A1 (en) * | 2005-09-29 | 2007-04-05 | Robert Bosch Gmbh | Method for coating a metallic part |
| US7213586B2 (en) * | 2004-08-12 | 2007-05-08 | Borgwarner Inc. | Exhaust gas recirculation valve |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007050811A1 (en) * | 2007-10-24 | 2009-04-30 | Robert Bosch Gmbh | Wear protection layer and method for its production |
-
1979
- 1979-05-09 DE DE19792918598 patent/DE2918598A1/en not_active Withdrawn
-
1980
- 1980-03-06 FR FR8005086A patent/FR2456225A1/en not_active Withdrawn
- 1980-03-27 GB GB8010265A patent/GB2049483A/en not_active Withdrawn
- 1980-05-08 IT IT21882/80A patent/IT1131462B/en active
- 1980-05-08 JP JP6003380A patent/JPS55151160A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0092230A2 (en) * | 1982-04-21 | 1983-10-26 | Siemens Aktiengesellschaft | Method of producing a lyophobic coating |
| EP0092230A3 (en) * | 1982-04-21 | 1984-12-19 | Siemens Aktiengesellschaft | Method of producing a lyophobic coating |
| US7213586B2 (en) * | 2004-08-12 | 2007-05-08 | Borgwarner Inc. | Exhaust gas recirculation valve |
| WO2007036426A1 (en) * | 2005-09-29 | 2007-04-05 | Robert Bosch Gmbh | Method for coating a metallic part |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55151160A (en) | 1980-11-25 |
| FR2456225A1 (en) | 1980-12-05 |
| DE2918598A1 (en) | 1980-11-20 |
| IT1131462B (en) | 1986-06-25 |
| IT8021882A0 (en) | 1980-05-08 |
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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) |