DE8105788U1 - "Electronic control device, especially for motor vehicles - Google Patents

Description

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6836

February 16, 1981 week / Kc

ROBERT BOSCH GMBH, 7OOO Stuttgart 1 Electronic control device, in particular for motor vehicles State of the art

The invention is based on an electronic control device according to the preamble of claim 1, as it is used in motor vehicles in the various injection systems. The fastening projections protruding over the edge of the sheet metal cover are placed around the edge of the housing designed as a base plate, engaging in recesses on the side edge and on the underside of the base plate. The depressions are only slightly deeper than the thickness of the fastening projections and run parallel to the edge and further to the underside of the base plate. As a result, the cover is fixed on the base plate and the fastening projections are prevented from being damaged. The disadvantage, however, is that the fastening projections folded over at right angles around the edge on the underside cannot keep the cover shake-proof and tight enough for the rough operation in motor vehicles.

Advantages of the invention

The electronic control device according to the invention with the characteristic Features of claim J has the advantage that the fastening projections bent around the edge of the housing of the lid is still born in an adjacent recess

are delt, in which the ends of the fastening projections can claw resiliently and thus enable a positive connection between housing and cover, which are sufficiently resistant to shaking stress even in control devices that are used in motor vehicles is and no additional mechanical connecting means for the tight arrangement of the cover on the housing requires.

The measures listed in the subclaims are advantageous developments of what is specified in claim 1 electronic control unit possible. The simultaneous formation of latching and adjacent ones is particularly advantageous Disassembly recesses on the housing, which apart from the simple attachment of the cover to the housing, the cover with simple Aids can be lifted from the housing.

drawing

Two embodiments of the invention are in the drawing shown. FIG. 1 shows an electronic control device in a side view, and FIG. 2 shows a section along the line II-II In Figure 1 and Figure 3, a modification of the embodiment according to Figure 2, each on an enlarged scale compared to Figure 1.

Description of the exemplary embodiments

An electronic control unit has a housing 1, which is an injection-molded part is formed from insulating plastic. The housing 1 has the shape of a base plate, on the front of which a Shaped receiving section 2 for a multi-pole plug device is. A flat annular groove U is formed on the protruding edge of the housing 3. The housing is on the edge of the housing 3

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overlapping cover 5 made of sheet metal. In the ring groove h , a known per se and not shown seal can be inserted as required , over which the lid 5 engages with its edge 6. The cover 5 is provided with fastening tabs 7 protruding beyond its edge 6. Each fastening tab 7 is guided in an associated recessed edge section 8 when the cover 5 is placed on the housing 1. The edge section 8 is slightly above t. flowing sheet thickness of the fastening tabs T on the amount of overall J back houses andes third At the bottom 9 of the housing 1 is

each recessed edge section 8 continued in an approximately equally deep recess 10. Of the recess 10 joins \ a deeper recess 11 with parallel to the housing edge 3 'extending abutment wall 12 and opposite wall. 13

To fasten the cover 5 placed on the edge 3 of the housing to the housing 1, the fastening tabs 6 inserted into the edge sections 7 are bent over into the recesses 10 on the underside of the housing 1. A middle section 15 of the fastening tabs T is pressed against the contact wall 12 of the recess 11 with a crimping tool 1U, the working direction of which is perpendicular to the underside 9 of the housing. The free end 16 of the fastening tab T is bent around the crimping tool ^ k according to its shape at an obtuse angle to the working direction of the crimping tool and latched on the opposite wall 13 of the recess 11 in such a way that its sharp punching edge 17 digs into the opposite wall 13. This flanged connection secures the cover 5 to the housing 11 in a form-fitting and shake-proof manner, since the free end 16, 17 of the fastening tabs 7, which is latched to the opposite wall 13 of the recess 11, can no longer spring back and thus the fastening tabs 7 cannot unintentionally detach from the housing 1 can.

6336

If the cover 5 is to be removed from the housing 1, then with a simple tool through a recess] 8 the opposite wall 13 of the recess 11 is guided and pushed behind the free end 16 of the fastening tab 7, the around the edge of the housing 3 flanged section 15 »16 of the fastening tab 7 can be pivoted out of the recess 11,

A modification of the recess 11 on the underside 9 of the Housing 1 is shown in FIG. As far as the parts are the same as those shown in Figures 1 and 2, have they pay the same reference. A modified recess 19, which is attached to the recess 10 of the bottom 9 of the housing 1 adjoins, in turn has a contact wall 12 which runs parallel to the working direction of the crimping tool 14 A counter wall 20 of the recess 19 is formed on an elastic tongue 21 which is essentially parallel to the contact wall 12 protrudes into recess 19. On the opposite wall 20, a locking lug 22 is formed, behind which when flanging the Fastening tabs 7 in the recess 19 of the edge of the free Ending 16 snaps. The fastening tabs 7 hold in turn the cover 5 form-fitting and shake-proof on the housing 1. For Removing the cover 5, the tongue 22 can be pivoted away from the edge at the free end 16. This version is suitable for Control devices in which a housing made of relatively elastic Plastic can be used.

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February 16, 1981 week / Kc

ROBERT BOSCH GMBH, TOOO Stuttgart 1

Electronic control device, in particular for motor vehicles

summary

An electronic control device is proposed that is used in motor vehicles, for example, with electronic ignition and Injection systems, full coil ignition and digital engine electronics is used. The control unit has a housing

(I) made of insulating plastic, which is covered by a sheet metal cover (5) is completed. The sheet metal cover (5) has fastening tabs (T), which are bent around the edge of the housing (3) and are crimped into recesses (11) of the housing (1), in which the free ends (16) of the fastening tabs (T) on a counter-wall (13) of the recess that runs parallel to the edge of the housing (3)

(II) are pressed. The cover (5) fastened in this way is seated form-fitting and shake-proof on the housing (.1), without additional Need fasteners.

Claims (6)

η. 6 83 6 February 16, 1981 Wo / Kc ROBERT BOSCH GMBH5 7000 Stuttgart 1 Claims 1. Electronic control device, especially for motor vehicles, with a housing made of insulating plastic, which with is closed by a sheet metal cover which has fastening tabs reaching around recessed edge sections of the housing, characterized in that that lie fastening tabs (7) each in one * '; adjacent to the recessed edge section (8, 10) of the housing (1) Recesses (11; 19) are pressed and their from the edge section (8) pioneering free end {l6, 17) at a counter-; wall (13; 20) of the recess (11 j 19) is held. H 2. Control device according to claim 1, characterized in that the 3reite of the recess (11; 19) between its contact wall (12) and counter wall (J3; 20) is smaller than the length of the section (15> 16) of the fastening tab (7) protruding beyond the recessed edge section (8, 10) in the middle section (j 5) can be pressed against the contact wall (.12) and can be locked with its free end (16) in the opposite wall (J3; 20), • ■ 3. Control device according to claim] or 2, characterized in that the fastening tabs (7) are bent around the associated recessed edge portions (8, 10) and the free end (16) of the fastening tabs (7) behind the on a contact wall (12) the recess (1Ii 19) flanged section (] 5) at an obtuse angle to the working direction of a flanging tool (1U) r \ n the opposite wall (I3i 20) of the recess (3 ^ i 19) is pressed. 1+. Control device according to one of Claims 1 to 3, characterized in that that on the opposite wall (J3i 20) of the recess (11; 19) a detent (22) is formed, behind which the the free end (J6) of the fastening tab (7) is pressed. 5, control device according to one of claims J to U, characterized in that that a dismantling recess (J8) is formed in the opposite wall (33) of the recess (11), 6. Control device according to one of claims J to U, characterized in that that the opposite wall (20) of the recess (J9) on a pivotable tongue (2.1) protruding into the recess (J9) is formed, on which a locking lug (22) is formed.