Spring clip for a heat sink apparatus

• US 5,327,324 A
• Filed: 11/05/1993
• Issued: 07/05/1994
• Est. Priority Date: 11/05/1993
• Status: Expired due to Fees

• Current Assignee: Visteon Global Technologies Incorporated (Visteon Corporation)
• Original Assignee: Ford Motor Company
• Inventors: Roth, Gregory A.
• Primary Examiner(s): Thompson, Gregory D.
• Application Number:
  US08/147,501
• Time in Patent Office: 242 Days
• Field of Search: 165/80.3, 165/185, 174/16.3, 257/718, 257/719, 257/726, 257/727, 267/150, 267/160, 361/704, 361/707-719, 361/722, 361/809
• US Class Current: 361/707
• CPC Class Codes: H05K 7/20854 Heat transfer by conduction from internal heat source to heat radiating structure H05K7/20863 takes precedence

Abstract

A spring clip for urging an electrical component onto a heat sink housing within an electronics component module is described. The spring clip comprises an elongated planar body, retention device for securing the body of the spring clip to the heat sink housing, the retention device depending downward from the body. The spring clip also includes urging device for contacting and urging the electrical component into a heat conducting relationship with the heat sink housing. The urging device includes a first elongate member depending downward from the body to a u-shaped junction. A second elongate member, extending upward from the u-shaped member and terminating at a contact surface, maintains the electrical component in a heat conducting relationship with the heat sink housing.

Claims

1. A spring clip for urging an electrical component onto a heat sink housing, said spring clip comprising:

an elongated planar body having a longitudinal axis extending from a right end to a left end, an intermediate portion therebetween, and an inner edge and an outer edge parallel to said longitudinal axis;

retention means for securing the body to said, heat sink housing, said retention means depending downward from each of said right and left ends of said body;

urging means for contacting and urging the electrical component into a heat conducting relationship with the heat sink housing, said urging means including a first elongated member depending downward from said inner edge of said body to a first end, a u-shaped junction extending from said first end to a second elongated member extending upward from said u-shaped junction toward said outer edge of said body, terminating at a contact surface.

2. A spring clip according to claim 1 wherein said first elongated member of said urging means tapers from said inner edge to said first end and said second member tapers from said u-shaped junction to said contact surface.

3. A spring clip according to claim 1, wherein said contact surface of said urging means further comprises a terminal portion turned away from the electrical component.

4. A spring clip according to claim 1, wherein said urging means comprises:

at least two first elongated members depending from said inner edge of said body to a first end, each of said at least two first members including a u-shaped junction extending from said first end to a second elongated member extending upward from said u-shaped junction toward said outer edge of said body and terminating at a contact surface; and

an equalizer member interconnecting said at least two first elongated members, said equalizer member being adapted to increase the torsional rigidity of said elongated planar body to reduce the variability of contact pressure among multiple electrical components.

5. A spring clip according to claim 4, wherein said urging means comprises a bridge depending from said outer edge and disposed between said at least two first elongated members, said bridge being adapted to increase the torsional rigidity of said elongated planar body to reduce the variability of contact pressure among multiple electrical components.

6. An electronic module having an electrical component, said module comprising:

a heat sink housing including;

a wall having a first and a second end;

a first pocket disposed at said first end of said wall;

a second pocket disposed at said second end of said wall;

a vertical rib disposed on said wall substantially midway between said first end and said second end;

a spring clip including an elongated planar body having a longitudinal axis extending from a right end to a left end, an intermediate portion therebetween, and an inner edge and an outer edge parallel to said longitudinal axis, said clip comprising;

retention means for securing said clip to said heat sink housing, said retention means extending downward from each of said ends of said body;

a tab disposed on said outer edge of said intermediate portion of said planar body substantially midway between said right and left ends, said tab being operative to contact said rib to limit the installation depth of said body into said heat sink housing; and

urging means for contacting and urging said electrical component into a heat conducting relationship with said heat sink housing, said urging means includes a first elongated member depending downward from said inner edge of said body to a first end, a u-shaped junction extending from said first end to a second elongate member extending upward from said u-shaped junction toward said outer edge of said body, terminating at a contact surface.

7. An electronic module according to claim 6, wherein said retention means is operative to compressively engage said first and second pockets upon insertion therein and operative to secure said clip in said heat sink housing.

8. An electronic module according to claim 6, wherein said tab is further operative to prevent rotation of said planar body about its longitudinal axis.

9. An electronic module according to claim 6, wherein said planar body further comprises a reinforcement groove traversing from said right end to said left end substantially parallel to said longitudinal axis of said planar body, said reinforcement groove being adapted to increase the torsional rigidity of said elongated planar body to reduce the variability of contact pressure among multiple electrical components.

10. A electronic module according to claim 6, wherein said first elongated member of said urging means tapers from said inner edge to said first end and said second member tapers from said u-shaped junction to said contact surface.

11. An electronic module according to claim 6, wherein said contact surface of said urging means further comprises a terminal portion turned away from said electrical component.

12. An electronic module according to claim 6, wherein said spring clip further comprising:

at least two first elongated members depending from said inner edge of said body to a first end, each of said at least two first members including a u-shaped junction extending from said first end to a second elongated member extending upward from said u-shaped junction toward said outer edge of said body, terminating at a contact surface; and

an equalizer member interconnecting at least two of said first members, said equalizer member being adapted to increase the torsional rigidity of said elongated planar body to reduce the variability of contact pressure among multiple electrical components. PG,13

13. An electronic module according to claim 12, wherein said urging means comprises a bridge depending from said outer edge, spanning between said at least two first elongated members, said bridge adapted to increase the torsional rigidity of said elongated planar body to reduce the variability of contact pressure among multiple electrical components.

14. An electronic module according to claim 6, wherein said urging means is operative to generate a predetermined contact pressure between said electronic component and said heat sink housing thereby establishing a predetermined heat conducting relationship therebetween;

and

said retention means is operative to generate a retention force between said retention means and said first and second pockets, said retention force being parallel to said longitudinal axis and perpendicular to said contact pressure.

15. An electronics component module for an automotive vehicle, said module comprising:

a heat sink housing including an exterior wall on said heat sink housing on which an electronic device is maintained in a thermally conductive relationship, said wall further includes a pair of vertically extending pockets offset on an interior side of said wall and oppositely disposed, said wall further comprises a vertical rib disposed on said interior side of said wall substantially midway between said pockets;

a top cover directly and sealingly securable to said heat sink housing;

a bottom cover directly and sealingly securable directly to said heat sink housing, thereby forming a sealed electronic module;

a spring clip including an elongated planar body having a longitudinal axis extending from a right end to a left end, an intermediate portion therebetween, and an inner edge and an outer edge parallel to said longitudinal axis, said spring clip comprising;

retainers extending downward from each of said ends of said body, said retainers adapted to compressively engage said first and second pockets, operatively securing said planar body in said heat sink housing;

a first elongated member extending downward from said inner edge of said body to a first end, a u-shaped junction extending from said first end to a second elongated extending upward from said u-shaped junction toward said outer edge of said body, terminating at a contact surface, said contact surface adapted to maintain said electrical component in a heat conducting relationship with said heat sink housing; and

a tab disposed on said outer edge of said intermediate portion of said planar body substantially midway between said right and left ends, said tab being operative to engage said rib to limit the installation depth of said body into said heat sink housing.

16. An electronic component module according to claim 15, wherein said pockets are chamfered to enhance insertion of said retainers.

17. An electronic component module according to claim 15, wherein said retainers are of a predetermined length so as to permit partial installation into said pockets, sufficient to prevent said retainers from disengaging from said pockets during transport on a conveyor prior to final installation.

18. An electronic component module according to claim 15, wherein said retainers comprises a tab disposed on each of said ends of said elongated planar body, splayed inward to form an angle nominally less than 90 degrees with said elongated body.

19. An electronic component module according to claim 18, wherein said pockets further comprise:

an inner shoulder disposed nearest the interior of said module;

an outer shoulder disposed adjacent to said wall, in combination with said inner wall, operative to prevent the rotation of said retainer, thereby preventing the rotation of said elongated body about said longitudinal axis of said body; and

an intermediate wall disposed between said inner shoulder and said outer shoulder, having a slope substantially parallel to said tab, said intermediate wall being operative to engage said tab in a compressive relationship confining said tab with respect to the longitudinal axis of said elongated body.