GB2061625A - Electronic control unit - Google Patents
Electronic control unit Download PDFInfo
- Publication number
- GB2061625A GB2061625A GB8034296A GB8034296A GB2061625A GB 2061625 A GB2061625 A GB 2061625A GB 8034296 A GB8034296 A GB 8034296A GB 8034296 A GB8034296 A GB 8034296A GB 2061625 A GB2061625 A GB 2061625A
- Authority
- GB
- United Kingdom
- Prior art keywords
- control unit
- housing
- pin
- potentiometer
- electronic control
- 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- Withdrawn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
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/06—Hermetically-sealed casings
- H05K5/069—Other details of the casing, e.g. wall structure, passage for a connector, a cable, a shaft
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Adjustable Resistors (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The control unit comprises a water-tight sealed housing (1, 7) accommodating a potentiometer (3) fixed on a printed circuit board (2). The potentiometer is adjustable externally of the housing by means of a pressure- and water-tight adjusting device in the form of a pin (15), sealingly passing between the interior and exterior of the housing. The outer end of the pin (15) has a shaped hole (29) to receive an adjusting key, and the housing cover (7) is then closed by a cap (30). <IMAGE>
Description
SPECIFICATION
Electronic control unit
The invention relates to an electronic control unit.
Such units are known having a water-tight sealed housing in which is accommodated a printed circuit board, carrying conductors, control elements and power stages as well as a potentiometer. In a known control unit of this kind, the housing is closed by a cover which is sealed to the housing with lead. A disadvantage of this is that the potentiometer can only be adjusted by damaging the watertight closure of the housing, i.e. the lead seal, and damage to the electronic components also cannot be excluded. Furthermore, when the components have been mounted on the printed circuit board, and once they have been adjusted, it is known to encapsulate them in order, inter alia, to protect them against moisture. However, this precludes any subsequent adjustment which may become necessary.
There is provided by the present invention an electronic control unit having a water-tight sealed housing in which is accommodated a printed circuit board which carries conductors and electronic control elements and power stages as well as a potentiometer, wherein the potentiometer is adjustable by a device which is actuable externally of the housing and which extends into the housing in a sealed manner.
In contrast to the known control unit, the electronic control unit in accordance with the invention has the advantage that the potentiometer can be infinitely readjusted by means of a device which is operable at any time externally of the housing, without risking damage to the sealing of the housing to the cover and to the parts extending out of the housing, thereby obtaining satisfactory reliability of adjustment for the device when using the electronic control unit for rough operation in motor vehicles.
It is particularly advantageous to construct the device from tough-resilient plastics material having a tolerance-compensating portion.
Thus, in the case of large-scale manufacture, it is possible to compensate for unavoidable large tolerances occasioned by manufacture and/or the differing coefficients of expansion of the various materials used for the housing and the printed circuit board.
An embodiment of the invention is illustrated in the accompanying drawing, which is a fragmentary section through parts of an electronic control unit having a device for adjusting a potentiometer.
A printed circuit board 2 is arranged in the housing 1 of an electronic control unit in a known manner. The printed circuit board 2 is provided with conductors in a known manner.
The printed circuit board 2 carries electronic components which are electrically conductively connected to the associated conductors.
The components include a potentiometer 3 which is received in a spacer 4. The spacer 4 engages on the printed circuit board 2. The connection tags 5 of the potentiometer 3 extend through openings 6 in the printed circuit board 2 and are connected to the associated conductors by soldering.
The housing 1 is sealed in a pressure- and water-tight manner by means of a cover 7. A boss 8 having a bore 9 is formed on the cover 7. The bore 9 has a widened end portion 10.
The bore 9 is provided with a guide portion 11 of smaller diameter towards the interior of the housing. A widened sealing portion 12 is contiguous with the guide portion 11, and an annular recess 13 having a radial stop 14 is contiguous with the sealing portion 12.
A device in the form of a rotary pin 15 for adjustment of the potentiometer 3 extends through the bore 9 from the exterior of the housing 1 into the interior of the housing. The rotary pin 15 is made from, for example, polyamide. The rotary pin has a longitudinally slotted, resilient end portion 16 provided with snecks 1 7. An annular shoulder 18 is contiguous with the end portion 16, and a stop flange 1 9 is contiguous with the annular shoulder 18. The end portion 16 and snecks 17, the annular shoulder 18 and the stop flange 1 9 from the fastening portion of the rotary pin 15.
The fastening portion of the rotary pin 15 is rotatably mounted in the region 11, 12, 13 of the bore in the cover 7. The end portion 16 extends through the guide portion 11, so that the snecks 17 embrace the rim of the guide portion. A sealing ring 20 is fitted into the sealing portion 12 and is seated on the annular shoulder 18 of the rotary pin 15 and is held under pressure in the sealing portion 12 by the stop flange 19 of the rotary pin. The stop flange 19 has a radial projection 21 which, together with the stop 14 in the annular recess 13 in the cover 7, limits the rotary movements of the rotary pin 15. To secure the rotary pin 15 against withdrawal from the guide portion 11 by an axial actuating force, the resilient end portion 16 of the rotary pin 15 incorporates an annular groove 22 in which a clamping ring is fitted. The clamping ring 23 prevents the snecks 17 on the end portion 16 from springing inwardly behind the guide portion 11 and thus prevents the rotary pin 15 from slipping out of the cover 7.
A tolerance-compensating portion 24 is contiguous with the fastening portion of the rotary pin 15 and is provided with two universal joints 25 and 26. A flat-plug-like end portion of the rotary pin 15 extends as an adjusting portion 27 into a slot in the centre tapping 28 of the potentiometer 3.
A A shaped hole 29 is formed in the base of the resilient end portion 16 of the rotary pin 15 for rigid engagement of an adjusting key which is of known construction and is not further illustrated.
After the potentiometer 3 has been adjusted, the bore 9 is closed by a cap 30 which is inserted into the widened end portion 10.
Claims (10)
1. An electronic control unit having a water-tight sealed housing in which is accommodated a printed circuit board which carries conductors and electronic control elements and power stages as well as a potentiometer, wherein the potentiometer is adjustable by a device which is actuable externally of the housing and which extends into the housing in a sealed manner.
2. A control unit as claimed in claim 1, wherein the device comprises a pin.
3. A control unit as claimed in claim 2, wherein the pin is a shaped pin having a latch portion and a sealing portion which are disposed in an opening in the housing and which has an adjusting portion connected to the potentiometer.
4. A control unit as claimed in claim 2 or 3, wherein the pin has a dimension-tolerancecompensating portion.
5. A control unit as claimed in any of the claims 2 to 4, wherein the pin has an externally accessible adjusting portion.
6. A control unit as claimed in any of the claims 2 to 3, wherein the pin has a device for preventing over-turning.
7. A control unit as claimed in any of the claims 1 to 6, wherein the pin is secured in the housing, and is covered externally of the housing by means of a cap.
8. A control unit as claimed in any of the claims 1 to 7, wherein the pin is made from tough-resilient plastics material.
9. A control unit as claimed in claim 4 or any of claims 5 to 8 as dependent thereon, wherein the tolerance-compensating portion of the shaped pin is in the form of at least one universal joint.
10. An electronic control unit substantially as hereinbefore described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19792943082 DE2943082A1 (en) | 1979-10-25 | 1979-10-25 | ELECTRONIC CONTROL UNIT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2061625A true GB2061625A (en) | 1981-05-13 |
Family
ID=6084327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8034296A Withdrawn GB2061625A (en) | 1979-10-25 | 1980-10-24 | Electronic control unit |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5667903A (en) |
| DE (1) | DE2943082A1 (en) |
| FR (1) | FR2468281A1 (en) |
| GB (1) | GB2061625A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0166111A1 (en) * | 1984-05-25 | 1986-01-02 | Robert Bosch Gmbh | Electronic control unit |
| IT201800004741A1 (en) * | 2018-04-20 | 2019-10-20 | POTENTIOMETER FOR CHECKING ELECTRICAL CIRCUITS |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2853863B1 (en) * | 2013-09-25 | 2017-03-01 | Baumer Electric Ag | Sensor with an access element for its housing |
-
1979
- 1979-10-25 DE DE19792943082 patent/DE2943082A1/en not_active Withdrawn
-
1980
- 1980-09-15 FR FR8019841A patent/FR2468281A1/en active Granted
- 1980-10-24 GB GB8034296A patent/GB2061625A/en not_active Withdrawn
- 1980-10-24 JP JP14844280A patent/JPS5667903A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0166111A1 (en) * | 1984-05-25 | 1986-01-02 | Robert Bosch Gmbh | Electronic control unit |
| IT201800004741A1 (en) * | 2018-04-20 | 2019-10-20 | POTENTIOMETER FOR CHECKING ELECTRICAL CIRCUITS | |
| WO2019202562A1 (en) * | 2018-04-20 | 2019-10-24 | Pizzato Elettrica S.R.L. | Potentiometer for controlling electric circuit |
| CN112514006A (en) * | 2018-04-20 | 2021-03-16 | 彼扎特电气有限公司 | Potentiometer for control circuit |
| CN112514006B (en) * | 2018-04-20 | 2022-06-10 | 彼扎特电气有限公司 | Potentiometer for control circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2943082A1 (en) | 1981-05-14 |
| FR2468281B3 (en) | 1983-06-24 |
| JPS5667903A (en) | 1981-06-08 |
| FR2468281A1 (en) | 1981-04-30 |
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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) |