Electrical switching and control device, in particular for motor vehicles

• US 5,280,410 A
• Filed: 08/19/1992
• Issued: 01/18/1994
• Est. Priority Date: 04/14/1990
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Petrzik, Martin, Klinger, Herbert, Thomas, Gerhard
• Primary Examiner(s): Tolin, Gerald P.
• Application Number:
  US07/923,785
• Time in Patent Office: 517 Days
• Field of Search: 174/16.3, 257/706, 257/707, 257/712, 257/713, 257/718, 257/719, 165/80.3, 165/185, 439/485, 361/380, 361/382, 361/383, 361/386-389, 361/395, 361/399, 361/413, 123/41.31
• US Class Current: 361/709
• CPC Class Codes: H05K 7/20854 Heat transfer by conduction from internal heat source to heat radiating structure H05K7/20863 takes precedence

Abstract

An electrical switching and control device, particularly for motor vehicles has a housing a printed circuit board, a plurality of electronic power components arranged in the housing and having leads soldered with the printed circuit board, another component element carried by the printed circuit board and connected with the latter, a heat sink carrying the power components and mechanically connected with the printed circuit board and also receiving heat generated in the power components and guiding it outwards, a plug-in strip arranged at the front side of the housing and soldered at its rear end with the printed circuit board, the plug-in strip being lockable at the printed circuit board, a frame formed so that the heat sink grasps the plug-in strip by the frame and is securely connected with the printed circuit board, a front panel placed on the plug-in strip with interposition of a seal and screwed together with the frame of the heat sink, the housing and having a front housing opening which is tightly closed by the front panel with a sealing ring.

Claims

1. An electrical switching and control device, particularly for motor vehicles, comprising a housing;

a printed circuit board;

a plurality of electronic power components arranged in said housing and having leads soldered with said printed circuit board;

another component carried by said printed circuit board and connected with the latter;

a heat sink carrying said power components and mechanically connected with said printed circuit board, said heat sink receiving heat generated in said power components and guiding it outwards;

a plug-in strip arranged at the front side of said housing and soldered at its rear end with said printed circuit board;

a frame on said heat sink so that said heat sink grasps said plug-in strip by said frame and is securely connected with said printed circuit board;

a front panel placed on said plug-in strip with interposition of a seal and screwed together with said frame of said heat sink, said housing having a front housing opening which is tightly closed by said front panel with a sealing ring.

2. An electrical switching said control device as defined in claim 1, wherein said plug-in strip has a collar, said front panel being placed on said collar of said plug-in strip with interposition of said seal.

3. An electrical switching and control device as defined in claim 1, wherein said heat sink has a plate-shaped portion at opposite sides of said frame grasping said plug-in strip, said plate-shaped portion being bent back and said power components being fastened on said plate-shaped portion in a heat conducting manner.

4. An electrical switching and control device as defined in claim 1, wherein said plug-in strip has narrow sides provided with a groove, said frame of said heat sink having a strip which engages in said groove.

5. An electrical switching and control device as defined in claim 1, wherein said groove has width at said plug-in strip which is greater than a thickness of said strip at said frame of said heat sink, said groove being provided with a projection to compensate for tolerances.

6. An electrical switching and control device as defined in claim 2, wherein said seal inserted between said plug-in strip and said front panel annularly encloses said collar of said plug-in strip and has a sealing eye, said frame of said heat sink having a recess in which said seal is inserted and a threaded bore hole, said front panel having a hole;

and further comprising a screw which is screwed into said threaded bore hole of said frame of said heat sink through said hole of said front panel and into said sealing eye of said seal.

7. An electrical switching and control device as defined in claim 1, wherein the printed circuit board has holes;

and further comprising a plastic frame having guide projections positioned in said holes of said printed circuit board and also having conically widened holes, said power components having connection pins which are threaded into said holes of said printed circuit board through said conically widened holes of said plastic frame.

8. An electrical switching and control device as defined in claim 7, wherein said heat sink has a plate-shaped portion, said plastic frame of said power components being lockable with said plate-shaped portion of said heat sink.

9. An electrical switching and control device as defined in claim 8;

and further comprising clamping springs, said power components being fastened by said plastic frame at said plate-shaped portion of said heat sink by said clamping springs.

10. An electrical switching and control device as defined in claim 3, wherein said printed circuit board has perforations, said plate-shaped portion of said heat sink having guide pegs inserted into said perforations of said printed circuit board.