GB2061621A - An electrical device - Google Patents
An electrical device Download PDFInfo
- Publication number
- GB2061621A GB2061621A GB8033173A GB8033173A GB2061621A GB 2061621 A GB2061621 A GB 2061621A GB 8033173 A GB8033173 A GB 8033173A GB 8033173 A GB8033173 A GB 8033173A GB 2061621 A GB2061621 A GB 2061621A
- Authority
- GB
- United Kingdom
- Prior art keywords
- base plate
- electrical device
- sealing compound
- protective cap
- filling tube
- 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
- 238000007789 sealing Methods 0.000 claims abstract description 38
- 230000001681 protective effect Effects 0.000 claims abstract description 22
- 150000001875 compounds Chemical class 0.000 claims abstract description 20
- 239000011347 resin Substances 0.000 claims abstract description 12
- 229920005989 resin Polymers 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims description 12
- 239000011810 insulating material Substances 0.000 claims description 5
- 239000012858 resilient material Substances 0.000 claims description 2
- 238000009736 wetting Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 2
- KGNDCEVUMONOKF-UGPLYTSKSA-N benzyl n-[(2r)-1-[(2s,4r)-2-[[(2s)-6-amino-1-(1,3-benzoxazol-2-yl)-1,1-dihydroxyhexan-2-yl]carbamoyl]-4-[(4-methylphenyl)methoxy]pyrrolidin-1-yl]-1-oxo-4-phenylbutan-2-yl]carbamate Chemical compound C1=CC(C)=CC=C1CO[C@H]1CN(C(=O)[C@@H](CCC=2C=CC=CC=2)NC(=O)OCC=2C=CC=CC=2)[C@H](C(=O)N[C@@H](CCCCN)C(O)(O)C=2OC3=CC=CC=C3N=2)C1 KGNDCEVUMONOKF-UGPLYTSKSA-N 0.000 description 12
- 229940125833 compound 23 Drugs 0.000 description 12
- 210000002105 tongue Anatomy 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000007921 spray Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- HSRJKNPTNIJEKV-UHFFFAOYSA-N Guaifenesin Chemical compound COC1=CC=CC=C1OCC(O)CO HSRJKNPTNIJEKV-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 210000003027 ear inner Anatomy 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/02—Bases, casings, or covers
- H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/02—Bases; Casings; Covers
- H01H50/023—Details concerning sealing, e.g. sealing casing with resin
Landscapes
- Casings For Electric Apparatus (AREA)
- Connector Housings Or Holding Contact Members (AREA)
- Motor Or Generator Frames (AREA)
Abstract
The invention provides an electrical device (10) such as a relay which is to be mounted in the engine space of a motor vehicle and has electrical parts (10,11,12,13,14) disposed on a base plate (15) of insulated material and surrounded by a protective cap (18) which is secured to the edges of the base plate and sealed by a sealing compound (23) applied to the inside of the base plate to cover the joint between the base plate (15) and the protective cap (18). The compound may also fill the gaps between the connection parts (14) and the base plate (15). The protective cap (18) is provided with an integrally formed tube (25) for the introduction of the sealing compound, in the form of a two part resin, and which tube is closed by a cap (26) after sealing. <IMAGE>
Description
SPECIFICATION
An electrical device
The invention relates to an electrical device.
In particular the invention relates to an electrical device for motor vehicles comprising a base plate of insulating material which carries electrical connections and a protective cap which surrounds the housing parts connected by the base plate and which engages over and is secured to an outer edge of the base plate.
In the known devices of this kind, no special measures are provided for sealing the electrical parts, disposed under the protective cap, against water. In these known devices, the moisture is kept away from the encapsulated electrical parts in a more or less effective manner by contact labyrinths between the protective cap and the base plate, by a continuous drip edge on the base plate or on the protective cap, and by narrow slots or bores in the base plate for the passage of connection parts. A solution of this kind is illustrated in, for example, German Patent Specification No.
1 5 36 823. Furthermore, it is known from
German Patent Specification No. 1 014 668 to interpose a resilient seal between the protective cap and the base plate for the purpose of improved sealing of the electrical parts.
Since electrical devices of this kind are being provided to an increasing extent in the engine compartments of motor vehicles where they are not protected against spray water and splash water, the known solutions are inadequate. In these cases, the sealing of encapsulated electrical devices has to be improved to an extent that moisture cannot enter the interior of the device even when the device is subjected to spray water from all sides at a spray pressure of up to 4 bar.
The object of the invention is to improve the sealing of encapsulated electrical devices by suitable, simple measures to an extent that they meet the requirements in the engine space of a motor vehicle.
According to the present invention there is provided an electrical device having a base plate of insulating material which carries electrical connections of the device, a protective cap which surrounds housing parts carried by the base plate and which engages over, and is secured to, an outer edge of the base plate and a sealing compound applied to the inside of the base plate to cover sealingly the joint or joints between the protective cap and the base plate.
Compared with the known constructions, the electrical device in accordance with the invention has the advantage that, by covering the joint between the protective cap and the base plate with a sealing compound, moisture in this region can no longer enter the interior of the electrical device.
It is particularly advantageous if the sealing compound completely covers the inside of the base plate and thereby also fills the gaps remaining between the openings in the base plate and the connection parts fitted therein.
Preferably, the sealing compound is a hardenable, hard resilient two-component casting resin which cover the inside of the base plate with a layer thickness in excess of 1 mm.
The present invention will now be described further, by way of example only, with reference to the accompanying drawing which is a cross section through an electrical device with a water-proof encapsulated relay combination.
The electrical device illustrated in the drawing, and drawn to the scale 2:1, includes a relay 11 and various electronic components of which only the resistor 1 2 is shown. The relay 11 and the electronic components are secured to a printed circuit board 1 3 which is in turn secured to a base plate 1 5 of insulating material by punched connection members 14 which are also secured to the printed circuit board.The ends of the connection members 14 are in the form of flat plug tongues 1 6 which extend through corresponding openings 1 7 in the base plate 1 5. The electrical parts 11, 1 2, 13, 14 disposed on the base plate 1 5 are surrounded by a protective cap 1 8 which is injection-moulded from an insulating material and which engages over the outer edge of the base plate 1 5. The protective cap 1 8 is secured to the base plate 1 5 by a plurality of latch tongues 1 9 which snap onto the periphery of the base plate 1 5. For the purpose of mounting the electrical device 10 in the motor vehicle, a fastening bar 20 is formed on the protective cap 1 8 and incorporates a hole 21 for the insertion of a screw.
The outer edge of the base plate 1 5 is provided with a collar 22 which surrounds the outwardly projecting flat plug tongues 1 6 and which forms a drip edge for the spray water striking the protective cap 1 8 and which also constitutes a connection aid for the pluggingin of the flat plug sleeves which are accommodated in a flat plug sleeve housing (coupling).
In order to obtain optimum sealing of the electrical device 10 against spray water, a sealing compound 23 comprising a two-component casting resin is applied to, and completely covers, the inside of the base plate 1 5.
The continuous contact surface 24 between the protective cap 1 8 and the edge of the base plate 1 5 is thereby also covered by the sealing compound 23.
In order to be able to apply the sealing compound 23 to the inside of the base plate 1 5 without sealing the encapsulated electrical parts, the protective cap 1 8 is provided with a filling tube 25 which terminates closely above the inside of the base plate 1 5. The sealing compound can be introduced into the filling tube 25 by means of an injection needle in an automatic manufacturing method. The sealing compound 23 is thereby metered such that it is applied to the inside of the base plate 1 5 in a layer of approximately 4 mm thickness and, during hardening, adheres to the base plate 1 5 and to the protective cap 1 8. With this thick layer of sealing compound 23, the end of the filling tube 25 extends into the sealing compound 23.This opening is thus also sealed against the intrustion of moisture.
However, in order to prevent dirt and water from entering the filling tube 25, the top of the filling tube is closed by a plug 26 which is mounted onto the filling tube 25 after the sealing compound 23 has been introduced.
Since the sealing compound 23 completely covers the inside of the base plate 15, the casting resin, which has a very low viscosity when heated, also enters the gaps between the openings 1 7 in the base plate 1 5 and the flat plugs 1 6 inserted therein. A soft resilient cover plate 27 of polyurethane is disposed on the outside of the base plate 1 5 in order to prevent the sealing compound 23 from flowing outwardly through the said gaps.The cover plate 27 is pushed over the flat tongues 1 6 and its edge abuts outwardly against the base plate 1 5. That side of the cover plate 27 which faces the base plate 1 5 is provided with shallow recesses 28 in the region of the flat plug tongues for the purpose of receiving the sealing compound 23 which flows through the gaps at the openings 1 7. Since the casting resin entering the recesses 28 bonds with the material of the cover plate 27, the points at which the flat plug tongues 1 6 pass through the base plate 1 5 are also fully sealed against water.Thus, the casting resin which accumulates between the base plate 1 5 and the cover plate 27 in a desired manner, and which wets and glues the two parts, prevents moisture from entering between the base plate and the sealing plate and consequently prevents a reduction of the insulation resistance and of the resistance to leakage current.
The invention is not confined to the illustrated embodiment, since the sealing compound can also be applied in other ways to the base plate in the interior of the electrical device. Thus, for example, it is also possible to mount a metering funnel 29 onto the filling tube 25 of the protective cap 1 8 in an automatic manufacturing process. The capacity of the funnel is adapted to the required quantity of casting resin, so that once the funnel has been filled, it has sufficient time to discharge its contents into the interior. Whilst the relay with the metering funnel 29 is passing through an oven, the casting resin becomes low-viscous and is uniformly distrib-.
uted over the base plate 1 5. The funnel 29 is then removed and the mouth, which has remained clean, of the filling tube 25 can then be sealed by means of the plug 26.
Furthermore, in the case of automatic manu
facture, it is also possible to coat the cover
plate 27 on the outside of the base plate 1 5 with so-called parting agents in order to be
able to remove the cover plate 27 as a
reusable casting mould after the casting resin
has hardened. In any case, the cover plate 27
reliably prevents the sealing compound 23
from flowing out and prevents the flat plug
tongues 1 6 from being soiled by the sealing
compound 23.
Alternatively, instead of using the soft resil
ient cover plate 27 which is pushed over the
flat plug tongues 16, is it possible to use a
covering block of appropriate configuration
which is either provided with separating
agents or is manufactured from a resilient
material, preferably silicon rubber or fluori
nated elastomers, which prevent wetting by
casting resin. A reusable block of this kind or
a cover plate 1 7 can be dispensed with if the
gaps between the base plate 1 5 and the flat
plug tongues 1 6 are very small, if the temper
ature fluctuations of the electrical device are
not too great, and if the viscosity of the
sealing compound is such that the compound
does not flow out downwardly at these gaps.
Claims (14)
1. An electrical device having a base plate
of insulating material which carries electrical
connections of the device, a protective cap
which surrounds housing parts carried by the
base plate and which engages over, and is
secured to, an outer edge of the base plate and a sealing compound applied to the inside
of the base plate to cover sealingly the joint or
joints between the protective cap and the base
plate.
2. An electrical device as claimed in claim
1, in which the sealing compound completely
covers the inside of the base plate.
3. An electrical device as claimed in claim
2, in which the sealing compound is a casting
resin which covers the inside of the base plate
in a layer having a thickness in excess of 1
mm.
4. An electrical device as claimed in any
of the preceding claims, in which the electrical
connections pass through openings in the
base plate and the sealing compound fills the
gaps between the electrical connections and
the openings.
5. An electrical device as claimed in claim
4, in which a soft resilient cover plate is
pushed over the connection parts from the
outside and abuts against the outside of the
base plate.
6. An electrical device as claimed in claim
5, in which that side of the cover plate which
faces the base plate incorporates a shallow
recess for receiving the sealing compound
passing through the gaps.
7. An electrical device as claimed in claim
5 or 6, in which the cover plate is rigidly connected to the sealing compound emerging at the gaps.
8. An electrical device as claimed in any preceding claim, in which the protective cap is provided with a filling tube for introducing the sealing compound, which filling tube terminates closely above the inside of the base plate.
9. An electrical device as claimed in claim 8, in which the end of the filling tube extends into the sealing compound on the inside of the base plate.
10. An electrical device as claimed in claim 8 or 9, in which the filling tube is sealed by a plug.
11. An electrical device as claimed in claim 8, 9 or 10, in which a metering funnel for a predetermined quantity of sealing compound is insertable into the filling tube.
1 2. An electrical device as claimed in claim 5, in which a reusable covering block in the form of a cover plate is manufactured from a resilient material which prevents wetting by casting resin.
1 3. An electrical device as claimed in any preceding claim, in which the electrical device is a relay for use in motor vehicles.
14. An electrical device constructed and arranged substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792942258 DE2942258A1 (en) | 1979-10-19 | 1979-10-19 | ELECTRICAL DEVICE, PREFERABLY RELAY FOR MOTOR VEHICLES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2061621A true GB2061621A (en) | 1981-05-13 |
| GB2061621B GB2061621B (en) | 1983-12-14 |
Family
ID=6083839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8033173A Expired GB2061621B (en) | 1979-10-19 | 1980-10-15 | Electrical device |
Country Status (4)
| Country | Link |
|---|---|
| DE (2) | DE2942258A1 (en) |
| FR (1) | FR2468280B1 (en) |
| GB (1) | GB2061621B (en) |
| IT (1) | IT1133725B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2511189A1 (en) * | 1981-08-05 | 1983-02-11 | Int Standard Electric Corp | ELECTROMAGNETIC RELAY |
| US4504697A (en) * | 1982-04-28 | 1985-03-12 | Littelfuse, Inc. | Sealed electrical devices |
| DE3827788A1 (en) * | 1987-08-14 | 1989-02-23 | Omron Tateisi Electronics Co | SEALED PUSHBUTTON SWITCH |
| US4969844A (en) * | 1988-10-06 | 1990-11-13 | Mitsubishi Denki Kabushiki Kaisha | Electromagnetic contector |
| EP0400434A1 (en) * | 1989-06-02 | 1990-12-05 | Kabelwerke Reinshagen GmbH | Casing for connecting an electric component particularly a relay to electric vehicle dashboard conductors |
| WO2001050552A1 (en) * | 1999-12-31 | 2001-07-12 | Robert Bosch Gmbh | Contact protection housing, injection pump and method for assembling a contact protection housing using an adapter |
| FR2867631A1 (en) * | 2004-03-10 | 2005-09-16 | Siemens Ag | Encapsulation of piezoelectric actuator in cylindrical mounting bush to form fuel injector for internal combustion engine, employs casting channel to avoid air bubble entrainment |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3230243C2 (en) * | 1981-08-26 | 1991-01-24 | Siemens AG, 1000 Berlin und 8000 München | Housing for an electrical component |
| DE8304816U1 (en) * | 1983-02-22 | 1985-08-29 | Stribel GmbH, 7443 Frickenhausen | Electromagnetic relay |
| DE3312081A1 (en) * | 1983-04-02 | 1984-10-11 | Brown, Boveri & Cie Ag, 6800 Mannheim | ZENER BARRIER |
| DE3318581A1 (en) * | 1983-05-20 | 1984-11-22 | Siemens AG, 1000 Berlin und 8000 München | Method for sealing an electrical component, especially a relay, and a component which is sealed in accordance with this method |
| EP0157938A3 (en) * | 1984-03-23 | 1987-05-13 | Siemens Aktiengesellschaft | Case for electrical components |
| DE8905080U1 (en) * | 1989-04-21 | 1990-08-16 | Siemens AG, 1000 Berlin und 8000 München | Housing for an electromechanical component |
| DE4216038C2 (en) * | 1992-05-15 | 1994-04-28 | Berthold Rothe | Reed relay housing |
| DE19703686C2 (en) * | 1997-01-31 | 1999-04-29 | Bosch Gmbh Robert | Contact protection housing for an electrical connection |
| DE10133151B4 (en) | 2001-07-07 | 2004-07-29 | Robert Bosch Gmbh | Component with a housing-surrounded component and device and method that can be used in its manufacture |
| JP2006014576A (en) * | 2004-05-21 | 2006-01-12 | Auto Network Gijutsu Kenkyusho:Kk | Electrical junction box and manufacturing method therefor |
| DE102007025338B4 (en) | 2007-05-31 | 2015-02-05 | Tyco Electronics Amp Gmbh | Method for sealing a housing and electrical component |
| AT507519B1 (en) * | 2008-11-07 | 2012-11-15 | Egston System Electronics Eggenburg Gmbh | ELECTRICAL DEVICE WITH A HOUSING |
| DE102014102539A1 (en) * | 2014-02-26 | 2015-08-27 | Getrag Getriebe- Und Zahnradfabrik Hermann Hagenmeyer Gmbh & Cie Kg | Control arrangement for a motor vehicle drive train |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1952092U (en) * | 1966-04-02 | 1966-12-22 | Standard Elektrik Lorenz Ag | MINIATURE ROTARY SWITCH. |
| DE2034068A1 (en) * | 1970-07-09 | 1972-01-13 | Bosch Gmbh Robert | Method for sealing housings with built-in, preferably electrical components |
| DE2353444C3 (en) * | 1973-10-25 | 1980-07-03 | Hans 8024 Deisenhofen Sauer | Electromagnetic relay embedded in insulating material |
| DE2622133A1 (en) * | 1976-05-18 | 1977-12-08 | Siemens Ag | ELECTRICAL COMPONENT, IN PARTICULAR ELECTROMAGNETIC RELAY |
| DE2717348C3 (en) * | 1977-04-19 | 1981-01-08 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Electromechanical component |
| DE7821508U1 (en) * | 1978-07-18 | 1978-10-26 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Electromechanical component, in particular relay |
-
1979
- 1979-10-19 DE DE19792942258 patent/DE2942258A1/en active Granted
- 1979-10-19 DE DE7929603U patent/DE7929603U1/en not_active Expired
-
1980
- 1980-07-28 FR FR8016611A patent/FR2468280B1/en not_active Expired
- 1980-10-15 GB GB8033173A patent/GB2061621B/en not_active Expired
- 1980-10-17 IT IT25443/80A patent/IT1133725B/en active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2511189A1 (en) * | 1981-08-05 | 1983-02-11 | Int Standard Electric Corp | ELECTROMAGNETIC RELAY |
| US4504697A (en) * | 1982-04-28 | 1985-03-12 | Littelfuse, Inc. | Sealed electrical devices |
| DE3827788A1 (en) * | 1987-08-14 | 1989-02-23 | Omron Tateisi Electronics Co | SEALED PUSHBUTTON SWITCH |
| US4969844A (en) * | 1988-10-06 | 1990-11-13 | Mitsubishi Denki Kabushiki Kaisha | Electromagnetic contector |
| EP0400434A1 (en) * | 1989-06-02 | 1990-12-05 | Kabelwerke Reinshagen GmbH | Casing for connecting an electric component particularly a relay to electric vehicle dashboard conductors |
| WO2001050552A1 (en) * | 1999-12-31 | 2001-07-12 | Robert Bosch Gmbh | Contact protection housing, injection pump and method for assembling a contact protection housing using an adapter |
| US6790078B1 (en) | 1999-12-31 | 2004-09-14 | Robert Bosch Gmbh | Contact protection housing, injection pump and method for mounting a contact protection housing with the aid of an adapter |
| FR2867631A1 (en) * | 2004-03-10 | 2005-09-16 | Siemens Ag | Encapsulation of piezoelectric actuator in cylindrical mounting bush to form fuel injector for internal combustion engine, employs casting channel to avoid air bubble entrainment |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2061621B (en) | 1983-12-14 |
| FR2468280B1 (en) | 1985-07-05 |
| DE2942258C2 (en) | 1989-06-15 |
| DE2942258A1 (en) | 1981-05-07 |
| FR2468280A1 (en) | 1981-04-30 |
| IT1133725B (en) | 1986-07-09 |
| DE7929603U1 (en) | 1982-12-02 |
| IT8025443A0 (en) | 1980-10-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |