JP2001041778A - Electric device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact device usable under limited conditions by constructing it such that a connection member excluding one contact section, another contact section and one connection section may be substantially embedded in a casing. SOLUTION: A connection member 19 is constructed of a contact member 31 having a contact section 18 and a spring member 32 having a connection section 28 in a connection section 29. In the connection section 29, the members 31, 32 are mutually welded in the overlapping region thereof. The member 31 is composed of a metal rail having a square cross section and positionwise fixed by a support assist member 33. The member 32 is composed of a metal rail having a circular cross section. The member 19 is embeded in a casing 12, except sections 18, 28, 29, by the plastic injection method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device, comprising a casing made of an electrically insulating material and a plurality of electrically connecting members insulated from each other. Each of the connecting members has a contact section at one end side for making a releasable contact with a corresponding contact member, and a connecting section at the other end side for connecting to a printed wiring board. And at least one
Two printed wiring boards are inserted into the housing chamber of the casing, said printed wiring boards having at least one electrical component on the front side on the one hand and the rear side of the printed wiring boards on the other hand It relates to a type having a conductor path.

[0002]

BACKGROUND OF THE INVENTION Published German Patent Application No. 331
From EP-A 0 474 177, an electrical device is known which is provided as a switching and control device for a motor vehicle, and which is preferably protected and mounted in the interior of the motor vehicle. The device is provided with a large-volume casing, which is made of an electrically insulated material, and which comprises at least one printed wiring board and a plurality of electrically insulated electrical connection members. have.

[0003] Each connecting element is supported over a small part length in a plug body attached to the housing.

[0004] Over a large part of the length, the connecting member extends exposed in the casing and is finally connected to the printed circuit board on the end side.

Due to such a construction, which increases the structural volume of the device, such a device can no longer be used under limited construction conditions. Also, when driving in unprotected areas of the motor vehicle, for example in the area of heavily splashed wheels, the device cannot be used without risk of loss of function.

[0006]

It is an object of the present invention to provide a compact device that can be used under restricted conditions.

[0007]

In accordance with the invention, the electrical device forms a measurement detector, in particular for a motor vehicle, and the connecting element has a contact section in the connection section. The connecting member is constituted by a member and a spring member having a connecting section, and the connecting member except for the contact section, the connecting section, and the connecting section is substantially embedded in the casing.

[0008]

The electrical device according to the present invention having the configuration according to the first aspect of the present invention prevents the above-mentioned disadvantages, and provides a compact device that can be used under limited conditions. It has the advantage of realizing. The device is designed to ensure its functioning under adverse and restrictive conditions such as may occur in a motor vehicle while driving.

For this purpose, the device is designed as a measuring value detector, in which the connecting element is substantially embedded in a housing made of electrically insulated material. This can reduce the required safety distance when the connection member is exposed and installed, and can reduce functional loss when the connection member is distorted or when the connection member is bridged by a metal member. Since the short-circuits that occur can be eliminated, the electrical connection members are functioning in a form-stable manner without additional measures and are reliably insulated from one another in a small space requirement.

In the event of high temperature displacements that can occur during operation of the motor vehicle, the connecting members are each separated from a contact member and a spring member so that the different expansion effects of the plastic material of the casing and the metal of each connecting member are buffered. It is configured. At this time, the temperature stress generated by the spring member is compensated.

As a result, the connection member is prevented from peeling off at the embedded portion in the casing and at the connection point with the conductor track on the other hand.

[0012] There is an advantage that no void is formed in the casing along the embedded portion of the connection member, and the invasion of moisture into the electric device is prevented. As a further advantage, the connection between the connecting element and the conductor track is kept stress-free. Therefore, the function is stable even under the use condition where the electric device is difficult.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 shows an electrical device 11. The electrical device 11 can be used in a motor vehicle as an electrical measured value detector, for example an angle pulse generator (Winkelimpulsgeber), a tachometer or the like.

The device 11 has a casing 12 made of electrically insulated plastic, which is processed by injection molding. The casing 12 is a main body extending in the longitudinal direction, and is a basic body having a rectangular parallelepiped region and a cylindrical region in a supplementary manner.

At right angles to the longitudinal direction of the casing 12, the casing 12 has a plate-like overhang 13 on one side and the other end of the casing 12 has a sleeve-like connection 1 at one end.
4 are formed.

A metal bush 16 is inserted into the overhang portion 13 and functions to house a fixing member (not shown) for fixing the position of the device 11 to a unit of a motor vehicle.

The connection portion 14, which functions to accommodate a connection insertion member (not shown), is set back to the connection opening 17 on the end face side of the connection portion 14, and A contact section 18 is arranged as an exposed end. This contact section 18 can be brought into contact with a corresponding contact member of the connection plug-in member and functions, for example, as a connection between the control device of the motor vehicle and the device 11.

A housing chamber 21 is formed at the other end of the casing, that is, at the end opposite to the connecting portion 14. A printed wiring board 22 is inserted into the accommodation room 21.

The printed wiring board 22 supports at least one electrical component 24 formed as a sensor on the front side 23. The accommodation room 21 is closed by a cup-shaped cap 25. The cap 25 is supported by the casing 12 in a sealed manner.

The electrical connection portion of the component 24 is formed on a rear side 26 of the printed wiring board 22 in a general-purpose format (not shown).
, Where it is materially connected to the conductor track 27 of the printed circuit board 22.

Further, these conductor paths 27 are connected to connection points 30.
Is electrically conductively connected to the connection section 28. These connection sections 28 form the exposed ends of the connection member 19, which are located opposite the contact sections 18.

The connecting member 19 comprises, in the coupling section 29, a contact member 31 having a contact section 18 and a spring member 32 having a connecting section 28. In the connecting section 29, the contact member 31 and the spring member 32 are separated by these two members 31, 32.
Are welded to each other in the overlap region.
The contact member 31 consists of a metal rail having a rectangular cross section and is fixed in position by a supporting auxiliary member 33.
The spring member 32 is formed of a metal rail having a circular cross section.

With the exception of the contact section 18, the connection section 28 and the connection section 29, the connection member 19 is completely embedded in the casing 12 by a plastic injection molding method.

In the event of a large temperature displacement, which can occur during operation of the motor vehicle, a gap between the plastic and the metal is provided between the plastic casing 12 and the metal connecting member 19 embedded in the casing. A tensile load and a compressive load are generated based on the different expansion rates. The tensile load and the compressive load cause breakage of the connecting part 30 particularly at the connecting part 30 between the connecting member 19 and the conductor track 27 when the connecting member 19 is formed integrally.

With the construction of the connecting member 19 according to the invention, the tensile load and the compressive load are reduced to an acceptable level. For this purpose, the spring member 32 of the connecting member 19 is connected to the extensible loop member 34 (Dehnschl).
aufe). Starting from the axially extending coupling section 29, the extensible loop member 34 has a radially curved semicircular arc 36 and a radially extending extension 37. After this, the spring element 32 transitions at the connection curve 38 into the axial extension and the connection section 28.

[0027] The tensile and compressive loads which occur during a temperature change, mainly through the axial course of the contact part 31 bent at right angles, are buffered by the construction of the spring element 32, in particular by the arc 36, and The transfer of the load to the axially extending connection section 28 is completely prevented by the radially extending extension 37.

The connecting section 28 is therefore sufficiently disconnected from the tensile and compressive loads that occur during temperature displacement, so that the load occurring at the connection 30 between the connecting section 28 and the conductor track 27 and the connecting element in the casing 12 19
The load along the buried portion is reduced to an acceptable level.

Therefore, the electrical device formed compactly by the connecting member 19 directly embedded in the casing 12 has a stable function even under adverse operating conditions such as a large temperature displacement and a load due to heavy splashing. Will be maintained.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electrical device.

[Explanation of symbols]

11 device, 12 casing, 13 overhang,
14 connection part, 16 metal bush, 17 connection opening,
18 contact section, 19 connection member, 21 accommodation room, 22 printed wiring board, 23 front side, 24
Constituent members, 25 caps, 26 back side, 27
Conductor track, 28 connection section, 29 connection section, 30
Connection point, 31 contact member, 32 spring member,
33 support auxiliary member, 34 extensible loop member, 36
Arc part, 37 extension part, 38 connection curved part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Ralph Rhein Germany Kornwestheim Jägerstrasse 79

Claims (4)

[Claims] 1. An electric device comprising a casing (12) made of an electrically insulating material and a plurality of electrically connected connecting members (19) insulated from each other. Each of the connecting members (19) has, at one end, a contact section (18) for making a releasable contact with a corresponding contact member, and a printed wiring board (22) at the other end. Connection type (2
8), wherein at least one printed wiring board (22) is inserted into the storage chamber (21) of the casing (12), and the printed wiring board (22) is on the one hand its front side (23). ) Has at least one electrical component (24) and, on the other hand, a conductor track (27) on the back side (26) of said printed wiring board (22), The electrical device (11) forms a measuring value detector, especially for motor vehicles, and the connecting element (19) is connected to the coupling section (2).
9) In the contact member (3) having the contact section (18),
1) and a spring member (3) having the connection section (28).
2), wherein the connecting member (19) is substantially embedded in the casing (12) except for the contact section (18), the connecting section (28), and the connecting section (29). An electrical device, characterized by: 2. The device according to claim 1, wherein the contact member has an angle and extends axially along the length of the device. 3. The coupling section (2) wherein the contact member (31) and the spring member (32) extend in the axial direction.
3. The device according to claim 2, which is combined in 9) and is guaranteed by a material-like connection. 4. An extensible loop member (34) is formed on said spring member (32), said extensible loop member (34) being a semicircular arc (36) curved in the radial direction.
And a radially extending extension (37).
An apparatus according to claim 3.