DE202018100161U1 - Fastening unit for interconnecting thermally loaded components - Google Patents

Abstract

Fastening unit (10) for connecting together thermally stressed components, in particular a heat-generating body (44) with a heat sink (42), comprising a holding pin (12) and a holding element (16), wherein the holding pin (12) with a holding head (14) is connected, the holding pin (12) passes through the holding element (16), the holding head (14) on the holding element (16) is applied, and the holding element (16) on the body (44) or heat sink (42) engages and this in one Fastening direction (26) of the retaining pin (12) holds, characterized in that the holding element (16) for a lateral attack on the body (44) or heat sink (42) is formed by the holding element (16) at its the body (44) or heat sink (42) facing side in a longitudinal direction transverse to the mounting direction extending retaining groove (24), wherein at least one groove surface (24a, 24b) in the mounted state at least partially on the body (44) or Kühlkör come by (42) to the plant.

Description

The invention relates to a fastening unit for interconnecting thermally stressed components according to the type specified in the preamble of claim 1. In addition, the invention also relates to a unit according to protection claim 16 and a device according to protection claim 18th

A generic fastening unit for interconnecting thermally loaded components, in particular a heat-generating body with a heat sink, comprises a retaining pin and a retaining element. The retaining pin is connected to a holding head. The retaining pin passes through the retaining element. The holding head abuts against the holding element. The retaining element engages the body or heat sink and holds it in a fastening direction of the retaining pin. In the attachment position, the retaining head connected to the retaining pin holds the retaining element and this in turn anchors the body or heat sink. The fastening pin is anchored in a bore of a component, for example a heat sink, when a thermal energy generating power module is to be held.

From the DE 103 06 227 A1 is a power module known as a thermally stressed body, which comprises at least one circuit board and heat-generating components. In addition, a heat sink is provided, which is designed as a hollow body and is flowed through by a cooling medium for heat dissipation. The heat-generating components are arranged on the outside of the heat sink on cooling surfaces and connected to these heat-conducting. The heat sink is symmetrical and provided with a plurality of inclined, arranged around a longitudinal axis of the heat sink around cooling surfaces. In the centrally arranged longitudinal axis of the heat sink, a fastening screw is provided with a screw head, which connects the heat sink and the board to each other via a spider-shaped clamping spring. The clamping spring presses the heat-generating components on the cooling surfaces of the heat sink and also serves for heat dissipation. Such a design is very expensive, since a holding element in the form of the spider-shaped clamping spring must be provided for each heat sink shape.

The DE 196 30 173 C2 discloses a power module with semiconductor devices having a board on which a plurality of chip-shaped power semiconductor devices and pads are arranged. On the board a housing with pressure contacts is arranged to switch the board accordingly. About a centrally arranged fastening screw a pressure piece is fixed on the housing and the circuit board firmly connected to the pressure piece. The pressure piece is formed from an electrically insulating material. In order to isolate the fastener relative to the housing of the board, a sleeve is provided in the housing, which surrounds the fastening screw. The problem with this design is that the interconnected components - board, housing, and pressure piece, which consist of different materials and are subjected to different temperatures due to the resulting temperature during operation, can not move relative to each other. It comes to tension and premature material fatigue.

The invention has the object of providing a fastening unit according to the type specified in the preamble of claim 1 such that, while avoiding the disadvantages mentioned a distortion by thermal expansion of thermally stressed bodies and other bodies is prevented in a simple manner.

This object is achieved by the characterizing features in connection with the generic features.

The dependent claims form advantageous developments of the invention.

According to the invention, the holding element is designed for a lateral attack on the body or heat sink, in which the holding element on its side facing the body or heat sink side has a longitudinal direction transversely to the mounting direction extending retaining groove, wherein at least one groove surface in the assembled state at least partially the body or heat sink comes to rest. This makes it possible in a simple manner that a relative movement with appropriate mounting can be made possible with a thermal expansion of the heat sink or the body.

According to an advantageous embodiment of the invention, the retaining groove is V-shaped formed by two groove surfaces, wherein a groove surface is aligned parallel to the longitudinal axis of the fixing pin and the other groove surface inclined thereto, in particular the groove surfaces have an acute or obtuse angle to each other. By means of this V-shaped retaining groove, different edge regions of cooling bodies can be kept simple without restricting movement of the retaining groove long ago. Depending on the design of the edge region of the body or heat sink or expected thermal stress, a sharp or obtuse angle is suitable. It comes to a linear or planar contact at least one groove surface of the retaining groove on the body or heat sink to be held.

Preferably, the holding element has a substantially rectangular base area. As a result, this can be easily manufactured, but also easily aligned during assembly to be held body. In particular, for this purpose, the holding element in the longitudinal direction of the retaining groove has a greater length than transversely to the longitudinal direction of the retaining groove.

According to a further embodiment of the invention, the retaining element is symmetrical and has two retaining grooves, so that the retaining element can come to rest simultaneously on different adjacently arranged bodies or cooling bodies. This increases the range of use and increases the flexibility of the fastening unit.

In order to protect in particular the retaining element against rotation relative to the body or heat sink to be held, it has proved to be advantageous that the holding element has centrally, laterally of the fastening pin each having an elongated, perpendicular to the pin projection, which in turn located on the holding head remote Side has a further groove. This groove attacks in particular on a bar. This results in a positive connection in the direction of rotation, but does not affect a movement relative to the retaining by thermal expansion. A rotation of the retaining element is thus prevented, but a thermal expansion in the longitudinal direction of the groove and the retaining groove arranged parallel thereto is still maintained.

Preferably, the further groove is V-shaped. In a simple way, both a line with the plant and a flat system can thereby be made possible, depending on the design of the groove opposite bearing surface of the body or heat sink to be held.

So that the fastening unit does not build up so high, the holding head engages in a recess of the holding element and rests there.

In particular, the holding head and the recess of the holding element are cylindrical, so that an end face of the holding head rests on the end face of the recess and a relative compensating movement about the cylinder axis is made possible. This is advantageous during assembly for aligning the holding element to be held body or heat sink. In addition, this may be favorable in certain constructions of the body and heat sink to compensate for stress.

Alternatively, it is also possible that the holding head is formed at least partially spherical on its side facing the recess, the recess has a partial head shape adapted to the holding head, so that the mutually facing spherical surfaces allow a compensating movement relative to each other in the manner of a ball joint. This ensures that there is no tension due to torques due to the thermal expansion of the interconnected body and heat sink.

The pin may have at its end remote from the holding head a thread which is associated with a thread in a bore in the heat sink or body. As a result, the fastening unit and thus the body and the heat sink is screwed together via the fastening unit.

Alternatively, the pin may have at its end remote from the holding head at least one locking means which is associated with an undercut in a bore in the heat sink or body. The pin is formed slotted in the region of the holding head remote end. By a latching connection, the body and the heat sink can be connected to one another via the fastening unit. The assembly is simplified.

Preferably, the body is formed by a power semiconductor. Power semiconductors generate a lot of heat and must be cooled by heat sinks. The fastening units according to the invention are particularly suitable for this, since the heat sinks are subjected to expansions.

The cooling body can be an air cooling body and / or a liquid cooling body.

According to one embodiment of the invention, the holding head of the fastening unit consists of a thermally and / or electrically insulating material, or of an electrically conductive material.

According to another aspect, the invention is characterized by a unit comprising at least two fastening units according to the above-mentioned type, which connect a heat sink and a body, wherein two fastening units are mounted diametrically opposite the body or heat sink, and with the body or Heat sink form a floating bearing. This makes it possible in a simple manner that a Relatvbewegung between the body and heat sink along the retaining grooves of the holding elements of the fastening units can be done.

Here, in the assembled state, the retaining grooves of the fastening units are aligned in particular parallel to each other.

According to another aspect, the invention is generally characterized by a device with two thermally loaded components, in particular with a heat sink and a body, which are interconnected by means of a floating bearing, which a relative movement of the one component and the other component at least along an axis allows, in particular with a fastening unit according to the aforementioned type.

Further advantages, features and possible applications of the present invention will become apparent from the following description in conjunction with the embodiments illustrated in the drawings.

In the description, the claims, and the drawing, the terms and associated reference numerals used in the list of reference numerals below are used. In the drawing:

1a a schematic side view of a fastening unit according to a first embodiment of the invention;

1b a perspective view obliquely from above on the mounting unit of 1a ;

1c an exploded view of 1b ;

2a a schematic side view of a fastening unit according to a second embodiment of the invention;

2 B a perspective view obliquely from above on the mounting unit of 2a ;

2c an exploded view of 2 B ;

3a a schematic side view of a fastening unit according to a third embodiment of the invention;

3b a perspective view obliquely from above on the mounting unit of 3a ;

4a a schematic side view of a fastening unit according to a fourth embodiment of the invention;

4b a perspective view obliquely from above on the mounting unit of 4a ;

5 a first application example in a sectional view of the third embodiment of the invention in the assembled state;

6 a second application example in a sectional view of the third embodiment of the invention in the assembled state, and

7 a third application example in an exploded perspective view of the first embodiment of the invention in the assembled state.

In the 1a . 1b and 1c is a first embodiment of a fastening unit 10 shown. The fastening unit 10 includes a fixing pin 12 that with a holding head 14 uniform material is firmly connected. In the present case, the fixing pin 12 with the holding head 14 made in one piece. The holding head 14 is cylindrical and has a hexagon socket 12a for screwing in the fastening pin 12 during assembly. The hexagon socket 12a forms an internal drive for the fixing pin 12 ,

In addition, the attachment unit includes 10 a holding element 16 which is a through hole 18 and concentric thereto a cylindrical recess 20 on the up-facing side 10a having. The holding element 16 has a rectangular basic shape in plan view. In the longitudinal direction is the holding element 16 longer than in the transverse direction. On a first long side 10b cantilevers a holding arm 22 over the entire longitudinal side 10b off and is opposite the upward facing page 10a tilted. Below the support arm 22 is a V-shaped retaining groove 24 parallel to the long side 10a provided, wherein the through holes 18 nearest groove surface 24a parallel to the through hole 18 runs and the other groove surface 24b this is done obliquely.

How the particular 1a it can be seen form the groove surfaces 24a and 24b the holding groove 24 an acute angle to each other.

The groove surface 24a is extended downwards and the bottom of the retaining element 16 falls partially obliquely to the groove surface 24a from.

The fixing pin 12 with holding head 14 is in the fastening direction, which by the reference numeral 26 is designated in the through hole 18 stuck until the holding head 14 with its front side on the upwardly facing surface of the recess 20 comes to the plant. In this state, the upper end side of the holding head closes 14 with the side facing up 10a at a height.

With the introduction of the fastening pin 12 with holding head 14 into the through hole 18 and the recess 20 of the holding element 16 becomes the attachment pin 12 also in a heat sink or anchored to another component, as will be explained in more detail below.

In the 2a . 2 B and 2c a second embodiment of the invention is shown. Like the ones in the 1a . 1b and 1c illustrated fastening unit 10 this also has the attachment pin 12 with holding head 14 on. Only the retaining element 16 is differently designed so far that on both long sides 10b and 10c a holding arm 22a . 22b over the entire longitudinal side 10b respectively. 10c juts out laterally, under each arm 22a . 22b each a holding groove 24c . 24d is provided and the parallel to through hole 18 extending groove surface 24a extended downwards. This results in a laterally to the mounting pin 12 running bridge with a central groove 30 , The holding element 16 is symmetrical with two retaining grooves 24c and 24d and a centrally extending further groove 30 , The groove 30 , the bridge 30a as well as the retaining grooves 24c and 24d run parallel to each other and perpendicular to the longitudinal axis and mounting direction 26 the fastening unit 10 ,

In the 3a and 3b a third embodiment of the invention is shown, which substantially corresponds to the second embodiment, wherein the fixing pin 12 a thread 32 has, which is associated with a thread, not shown here in a heat sink, also not shown here. The fixing pin 12 is thus designed to be screwed into an associated thread.

In the 4a and 4b a fourth embodiment of the invention is shown, which substantially corresponds to the second embodiment, wherein the fixing pin 12 one from his free end 34 into the retaining element 16 in running slot 36 having. In addition, the attachment pin 12 and the holding element 16 integrally formed and made of one piece. At the free end 34 is a catch 38 provided, which is a paragraph 38a forms and to the free end 34 downsized. The fixing pin 12 as well as the catch 38 are formed substantially cylindrical or conical. In a bore, not shown here in a heat sink, also not shown here, an undercut is introduced, in which the catch 38 engages in the assembled state and the paragraph 38a at the undercut comes to the plant. About the catch 38 becomes the attachment unit 10 fastened in the hole.

In the 5 to 7 are different embodiments of applications of the fastening units according to the invention 10 shown.

The 5 and 6 each show attachment units 10 according to the first and third embodiments with a one thread 32 having mounting pin and are each in a threaded hole 40 a heat sink 42 screwed.

In 5 is the heat sink 42 formed substantially cuboid. At the top are thermal energy generating power semiconductors 44 over the fastening units 10 connected to the heat sink, so that the retaining arms 22 with the retaining grooves 24 the fastening units respectively at the edge of the power semiconductor 44 come to the plant. On the outer sides of the heat sink are fastening units 10 according to the first embodiment, which only at one edge of a power semiconductor 44 attack and hold this, with mid-range attachment units 10 are provided according to the third embodiment, which with their holding arms 22a . 22b and the retaining grooves 24c . 24d at the edges of two different power semiconductors 44 attack and hold this. The holding arms 22a . 22b with their holding grooves 24c . 24d lie respectively linear or flat at the edge of the power semiconductor 44 at. All retaining grooves 24 the fastening units 10 are aligned parallel to each other.

In 6 is a sectional trapezoidal heat sink shown. Again, the power semiconductors 44 at the top of the heat sink 42 arranged. On the outer side of the heat sink 42 are fastening units 10 according to the first embodiment in the heat sink 42 screwed in and hold on the edge of a power semiconductor 44 , In the middle area are fastening units 10 according to the third embodiment at the edges of the heat sink 42 screwed into a corresponding hole, engage in each case two adjacent power semiconductors 44 and hold these. From this it becomes clear that through the V-shaped retaining grooves 24 also mutually inclined power semiconductors 44 can be easily fixed without the retaining elements 16 need to be adjusted.

In 7 becomes the arrangement of the fastening units 10 in the heat sink 42 and relative to the edge of the power semiconductor. The fixing pins 12 be in associated holes 40 in the heat sink 42 screwed. These are fastening units 10 according to the first embodiment.

Through the retaining grooves 24 and the attachment of the fastening units 10 on opposite sides it is possible that an expansion of the power semiconductors 44 parallel to the retaining grooves 24 can be done. A distortion is avoided. For example, two fastening units each 10 on each longitudinal side of a power semiconductor 44 arranged. Depending on whether the fixing units 10 one or two adjacent power semiconductors 44 should keep the embodiment of the attachment unit 10 with a holding arm 22 or two retaining arms 22a . 22b for use. The power semiconductors 44 are thus held by a floating bearing, ie a movement in one direction is made possible. This direction is the main expansion direction of the power semiconductor 44 ,

About the length of the lateral projection of the holding arms 22 can the distance between two power semiconductors 44 but also the distance of the hole for the fixing pin 12 to the edge of the power semiconductor 44 be set.

Preferably, a set of retaining elements 16 provided, which different lengths of the lateral excavation of the support arms 22 exhibit. Depending on your needs then the retaining element 16 with a larger laterally projecting or a slightly laterally projecting support arm 22 taken. The fixing pin 12 with holding head 14 can for the different holding elements 16 stay the same. But it can also different lengths and diameter having mounting pins 12 be provided during assembly.

Depending on the application, the fastening units 10 be electrically conductive, electrically insulating, thermally conductive or thermally insulated. It is also possible that the retaining elements 16 on one side and the fixing pin 12 with holding head 14 on the other hand have different material properties.

The fastening units 10 According to the invention thus allow in a simple way the expansion of the power semiconductor 44 and thus a relative movement between power semiconductors 44 and heat sink 42 , By firmly anchoring the fixing pins 12 Elastic deformation along the attachment axis is prevented. In a simple way, tension during operation is prevented.

LIST OF REFERENCE NUMBERS

10

fixing unit

10a

upwards facing page

10b

Long side - right

10c

Long side - left

12

fastening pin

12a

Hexagon socket, internal drive

14

holding head

16

retaining element

18

Through Hole

20

recess

22

holding arm

22a

Holding arm - left

22b

Holding arm - right

24

retaining groove

24a

Grooved surface parallel to the through hole 18

24b

Grooved surface oblique to the through hole 18

24c

Holding groove - left

24d

Holding groove - right

26

mounting direction

28

web

30

another groove

30a

web

32

thread

34

free end

36

slot

38

notch

40

drilling

42

heatsink

44

Power semiconductor

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10306227 A1 [0003]
• DE 19630173 C2 [0004]

Claims (18)

Mounting unit ( 10 ) for interconnecting thermally stressed components, in particular a heat-generating body ( 44 ) with a heat sink ( 42 ) comprising a retaining pin ( 12 ) and a holding element ( 16 ), the retaining pin ( 12 ) with a holding head ( 14 ), the retaining pin ( 12 ) the retaining element ( 16 ), the holding head ( 14 ) on the retaining element ( 16 ) is applied, and the holding element ( 16 ) on the body ( 44 ) or heat sink ( 42 ) and this in a fastening direction ( 26 ) of the retaining pin ( 12 ), characterized in that the retaining element ( 16 ) for a lateral attack on the body ( 44 ) or heat sink ( 42 ) is formed by the holding element ( 16 ) on his body ( 44 ) or heat sink ( 42 ) facing side in a longitudinal direction transversely to the mounting direction extending retaining groove ( 24 ), wherein at least one groove surface ( 24a . 24b ) in the assembled state at least partially on the body ( 44 ) or heat sink ( 42 ) come to the plant. Fastening unit according to claim 1, characterized in that the retaining groove ( 24 ) V-shaped by two groove surfaces ( 24a . 24b ) is formed, wherein a groove surface ( 24a ; 24b ) parallel to the longitudinal axis of the fixing pin ( 12 ) and the other groove surface ( 24a ; 24b ) is inclined, in particular the groove surfaces ( 24a . 24b ) have an acute or obtuse angle to each other. Fastening unit according to claim 1 or 2, characterized in that the retaining element ( 16 ) has a substantially rectangular base. Fastening unit according to one of the preceding claims, characterized in that the retaining element ( 16 ) in the longitudinal direction of the retaining groove ( 24 ) has a greater length than transversely to the longitudinal direction of the retaining groove ( 24 ). Fastening unit according to one of the preceding claims, characterized by a symmetrical design of the retaining element ( 16 ) with two retaining grooves ( 24 ), so that the retaining element ( 16 ) on different adjacently arranged bodies ( 44 ) or heat sinks ( 42 ) can come to rest at the same time. Fastening unit according to claim 5, characterized in that the holding element ( 16 ) in the middle, at the side of the fixing pin ( 12 ) each have an elongated, perpendicular to the fixing pin ( 12 ) extending projection (bridge 30a ), which in turn on the holding head ( 14 ) remote side another groove ( 30 ) having. Fastening unit according to claim 6, characterized in that the further groove ( 30 ) Is V-shaped. Fastening unit according to one of the preceding claims, characterized in that the holding head ( 14 ) in a recess ( 20 ) of the retaining element ( 16 ) engages and rests there. Fastening unit according to claim 8, characterized in that the holding head ( 14 ) cylindrical and the recess ( 20 ) is cylindrical, so that an end face of the holding head ( 14 ) on the front side of the recess ( 20 ) is applied and a relative compensation movement is made possible around the cylinder axis. Fastening unit according to one of claims 1 to 8, characterized in that the holding head ( 14 ) on its recess ( 20 ) facing side is formed at least partially spherical, the recess ( 20 ) a the holding head ( 14 ) adapted partial spherical shape, so that the mutually facing spherical surfaces allow a compensating movement relative to each other in the manner of a ball joint. Fastening unit according to one of the preceding claims, characterized in that the fastening pin ( 12 ) at its the holding head ( 14 ) remote end ( 34 ) a thread ( 32 ) having a thread ( 32 ) in a bore ( 40 ) in the heat sink ( 42 ) or body ( 44 ) assigned. Fastening unit according to one of claims 1 to 10, characterized in that the fastening pin ( 12 ) at its the holding head ( 14 ) remote end ( 32 ) at least one latching means ( 38 ), which an undercut in a bore ( 40 ) in the heat sink ( 42 ) or body ( 44 ) is assigned and the fixing pin in the region of the holding head ( 14 ) remote end ( 34 ) is formed slotted. Fastening unit according to one of the preceding claims, characterized in that the body ( 44 ) is formed by a power semiconductor. Fastening unit according to one of the preceding claims, characterized in that the heat sink ( 42 ) is an air cooling body and / or a liquid cooling body. Fastening unit according to one of the preceding claims, characterized in that the holding head ( 14 ) consists of a thermally and / or electrically insulating material, or of an electrically conductive material. Unit comprising at least two fastening units according to one of the preceding claims with a heat sink ( 42 ) and a body ( 44 ), which are connected to one another via the fastening units, characterized in that two fastening units ( 10 ) opposite to the edge of the body ( 44 ) or heat sink ( 42 ) and with the body ( 44 ) or heat sink ( 42 ) form a loose bearing. Unit according to claim 16, characterized in that in the mounted state the retaining grooves ( 24 ) of the fastening units ( 10 ) are aligned parallel to each other. Device with two thermally loaded components, in particular a heat sink ( 42 ) and a body ( 44 ), which are connected to one another by means of a movable bearing, which allows a relative movement of the one component and of the other component at least along one axis, in particular with a fastening unit ( 10 ) according to one of the preceding claims.

Images