Heat sink assembly for electronic equipment

Patent metadata

Field	Value
Publication number	US-2022011056-A1
Application number	US-202016922015-A
Country	US
Kind code	A1
Filing date	Jul 7, 2020
Priority date	Jul 7, 2020
Publication date	Jan 13, 2022
Grant date	—

Abstract

A heat sink assembly for a cage for a field replaceable computing module includes a heat sink, a thermal interface material (TIM), and an actuation assembly. The heat sink includes fins and a mating surface positioned at a base of the fins. The TIM includes a first surface that is coupled to the mating surface of the heat sink and a second surface that is opposite the first surface. Thus, the second surface can engage a heat transfer surface of a field replaceable computing module installed adjacent the heat sink. The actuation assembly includes a rotational cam. When the rotational cam is in a first position, the second surface of the TIM contacts the heat transfer surface of the computing module. When the rotational cam moves to a second position, the second surface of the TIM is moved a distance away from the heat transfer surface of the computing module.

First claim

What is claimed is:

1 . An apparatus comprising:
a cage defining a chamber; a heat sink including fins to facilitate heat dissipation and a mating surface positioned at a base of the fins; a thermal interface material including a first surface and a second surface, the first surface being coupled to the mating surface of the heat sink and the second surface being opposite the first surface so that the second surface can be positioned against a perimeter of the chamber; and an actuation assembly including a rotational cam, wherein when the rotational cam is in a first position, the second surface of the thermal interface material is disposed within or adjacent the perimeter of the chamber, and when the rotational cam moved to a second position, the second surface of the thermal interface material is moved a distance away from the perimeter of the chamber.

2 . The apparatus of claim 1 , wherein the second surface of the thermal interface material is parallel to a top of the perimeter of the chamber when the rotational cam is in the second position.

3 . The apparatus of claim 2 , wherein the heat sink moves along one degree of freedom when moving the rotational cam moves between the first position and the second position.

4 . The apparatus of claim 2 , wherein the heat sink spans a front-to-back dimension of the chamber.

5 . The apparatus of claim 1 , wherein the actuation assembly further comprises:
an axle, the rotational cam being mounted on the axle and being movable between the first position and the second position via rotation of the axle.

6 . The apparatus of claim 5 , wherein the actuation assembly further comprises:
an actuator connected to the axle and configured to cause the rotation of the axle in response to rotational actuations of the actuator.

7 . The apparatus of claim 6 , wherein the actuator comprises:
a fixed portion that is only rotatable; and a rider that rotates with the fixed portion and is movable along the fixed portion to selectively lock the axle in positions that lock the rotational cam in the first position or the second position.

8 . The apparatus of claim 5 , wherein the cage further comprises:
a rear support bracket that supports at least the axle.

9 . The apparatus of claim 1 , wherein the heat sink further comprises at least one pair of longitudinal channels, and the apparatus further comprises:
at least one pair of guide pins configured to engage the at least one pair of longitudinal channels.

10 . The apparatus of claim 1 , wherein the second surface of the thermal interface material can selectively engage a heat transfer surface of a field replaceable computing module installed in the chamber of the cage, the second surface contacting the heat transfer surface of the field replaceable computing module when the rotational cam is in the first position and being spaced apart from the heat transfer surface of the field replaceable computing module when the rotational cam is in the second position.

11 . The apparatus of claim 10 , wherein the heat sink further comprises:
a locking feature disposed on its mating surface, the locking feature being configured to removably engage a corresponding feature included on the heat transfer surface of the field replaceable computing module installed in the chamber of the cage when the rotational cam is in the first position.

12 . A heat sink assembly for a cage for a field replaceable computing module, comprising:
a heat sink including fins to facilitate heat dissipation and a mating surface positioned at a base of the fins; a thermal interface material including a first surface and a second surface, the first surface being coupled to the mating surface of the heat sink and the second surface being opposite the first surface so that the second surface can engage a heat transfer surface of the field replaceable computing module installed adjacent the heat sink; and an actuation assembly including a rotational cam, wherein when the rotational cam is in a first position, the second surface of the thermal interface material contacts the heat transfer surface of the field replaceable computing module, and when the rotational cam moves to a second position, the second surface of the thermal interface material is moved a distance away from the heat transfer surface of the field replaceable computing module.

13 . The heat sink assembly of claim 12 , wherein the second surface of the thermal interface material is parallel to the heat transfer surface of the field replaceable computing module when the rotational cam is in the second position.

14 . The heat sink assembly of claim 13 , wherein the heat sink moves along one degree of freedom when moving the rotational cam moves between the first position and the second position.

15 . The heat sink assembly of claim 12 , wherein the actuation assembly further comprises:
an axle, the rotational cam being mounted on the axle and being movable between the first position and the second position via rotation of the axle.

16 . The heat sink assembly of claim 15 , wherein the actuation assembly further comprises:
an actuator connected to the axle and configured to cause the rotation of the axle in response to rotational actuations of the actuator.

17 . The heat sink assembly of claim 15 , wherein the heat sink further comprises:
a through hole extending through the fins of the heat sink, the axle extending through the through hole.

18 . The heat sink assembly of claim 12 , wherein the heat sink further comprises at least one pair of longitudinal channels, and the heat sink assembly further comprises:
at least one pair of guide pins configured to engage the at least one pair of longitudinal channels.

19 . A system comprising:
a cage defining a chamber sized to receive a field replaceable computing module with a heat transfer surface; a heat sink including fins to facilitate heat dissipation and a mating surface positioned at a base of the fins; a thermal interface material including a first surface and a second surface, the first surface being coupled to the mating surface of the heat sink and the second surface being opposite the first surface so that the second surface can selectively engage the heat transfer surface of the field replaceable computing module when the field replaceable computing module is installed in the chamber of the cage; and an actuation assembly including a rotational cam, wherein when the field replaceable computing module is installed in the chamber of the cage and the rotational cam is in a first position, the second surface of the thermal interface material contacts the heat transfer surface of the field replaceable computing module, and when the rotational cam moved to a second position, the second surface of the thermal interface material is moved a distance away from the heat transfer surface of the field replaceable computing module.

20 . The system of claim 19 , further comprising:
circuitry configured to activate a light to provide an illuminated indication when the rotational cam is in at least one of the first position or the second position.

Assignees

• Cisco Tech Inc

Inventors

• Gupta Rohit Dev
• Gaitonde Tilak
• Pavithran Prashanth

Classifications

• F28D2021/0029

  Heat sinks · CPC title

• H05K7/20472

  Sheet interfaces · CPC title

• F28F5/02

  Rotary drums or rollers · CPC title

• H05K7/20418 Primary

  the radiating structures being additional and fastened onto the housing · CPC title

• F28D19/04 Primary

  using rigid bodies, e.g. mounted on a movable carrier · CPC title