Interference fit arrangement and method for an interference fit arrangement

Abstract

An interference fit arrangement (200, 300, 400, 500, 600, 700) and a method (800) for producing an interference fit, comprising: a first joining part (210, 310, 410, 510, 610, 710) with a periodic first interference fit profile (250, 345, 550, 650, 750) and a second joining part (270, 370, 470, 570, 670, 770) with a periodic second interference fit profile (290, 385, 590, 690, 790), wherein the joining parts are joined or can be joined by plastically pressing the first interference fit profile (250, 345, 550, 650, 750) into the second interference fit profile (290, 390, 590, 690, 790), characterized in that the periodicity of the second interference fit profile (290, 390, 590, 690, 790) is an integral multiple of the periodicity of the first interference fit profile (250, 345, 550, 650, 750), excluding the single periodicity of the first interference fit profile (250, 345, 550, 650, 750).

Description

[0001] Press fit arrangement and method for a press fit arrangement

[0002] The present invention relates to a mechanical connection of parts. This connection is intended as a replacement for screw connections between individual parts. Furthermore, a mechanical connection is provided for the dissipation of heat, in particular waste heat. This can also relate to the heat dissipation of electrical, for example, electronic, circuits. In particular, but not limited to, a press-fit arrangement and a manufacturing method of the press-fit arrangement for establishing the mechanical connection and for heat conduction are disclosed.

[0003] Electrical circuits comprise heat sources that must be dissipated via heat transfer systems to heat sinks (the surrounding air) to ensure the long-term and reliable function of the electrical circuit. Heat transfer systems can be designed as thermal contacts, which in turn can be designed as heat sinks. The heat must be dissipated to the thermal contact (heat sink) via thermal contacts. Various geometric designs of thermal contacts designed as heat sinks are known, which vary greatly depending on the thermal power to be dissipated, the material of the heat sinks and their thermal conductivity, the flow velocity of the cooling medium, and the spatial conditions of the other elements and housings surrounding the circuit.

[0004] To counteract the large number of different heat sinks, multi-part heat sinks with a small set of parts are known. These are based on a number of given components. These can be combined in various ways according to a variety of thermal and spatial requirements. This way, the variance of heat sinks required for different conditions can be reduced.

[0005] Joining a multi-part heat sink with a small set of parts allows for a wide variety of heat sinks to be manufactured. In particular, the same fins / base bodies can be combined with different heat transfer modules (e.g., heat spreaders) for heat dissipation to absorb heat from different heat sources (e.g., depending on the component height of a circuit board). It is important to achieve the most unhindered heat conduction possible at the joint, as the heat flow must flow through this joint during operation. For example, press fits are known for joining such a multi-part heat sink. Joining parts with a press-fit profile can be used for joints, allowing freedom of choice for the joint and thus greater variability.

[0006] One problem is that the press-fit profiles, which are particularly high-quality for thermal conduction and mechanical connection, cannot be simple plug-in profiles (like tongue and groove), but rather have, for example, V-shaped legs and V-shaped grooves. This more complex geometry limits the freedom in the relative positioning of the joining parts.

[0007] The invention is therefore based on the object of achieving a mechanical and thermal simplification while refining the relative positioning of the joining parts to one another.

[0008] The object is achieved by the features of each of the independent claims. Expedient embodiments and advantageous further developments of the invention are specified in the dependent claims.

[0009] Embodiments of the invention, which can be optionally combined with one another, are disclosed below with partial reference to the figures. In particular, features mentioned in the context of the device can also be implemented correspondingly in the method, for example, by a step of providing the corresponding feature or by a step of executing a function of the device. Furthermore, the device can comprise any feature mentioned in the context of the method and can be configured to execute any step mentioned in the context of the method.

[0010] A first aspect relates to a press-fit arrangement. This comprises a first joining part with a periodic first press-fit profile. The press-fit arrangement further comprises a second joining part with a periodic second press-fit profile. The joining parts are joined or can be joined by plastically pressing the first press-fit profile into the second press-fit profile.

[0011] The periodicity of the second press fit profile is an integer multiple of the periodicity of the first press fit profile, excluding the simple periodicity of the first press fit profile.

[0012] A press-fit arrangement comprises a press fit that allows a thermal (namely heat-conducting) and a mechanical connection of at least a first press-fit profile and a second press-fit profile. The heat-conducting connection of the press fit can be as effective as if the heat sink and heat transport module were integrally formed. This means that the device can be comparable to a device manufactured from a single block with regard to heat transfer. Likewise, production is modular for easy variant creation. For example, due to the press fit and, in addition or alternatively, a metallic form fit, force fit, or possibly even material fit, surfaces at the first end that are in contact with the heat sink can have a thermal resistance that essentially corresponds to an integral, one-piece component.

[0013] A press-fit profile (also: first press-fit profile) at a first end of the heat transfer module may include cantilevered surfaces and transverse surfaces. The cantilevered surfaces may be concave, convex, and additionally or alternatively longitudinal surfaces, and additionally or alternatively extend in extension of the distance from the second end to the first end (i.e., a longitudinal direction of the heat transfer module).

[0014] The transverse surfaces may be surfaces adjacent to and supplementary or alternatively between the cantilevered surfaces and may additionally or alternatively extend transversely (e.g. perpendicularly) to the longitudinal direction.

[0015] The interference fit allows heat to be transferred to the heat sink via both the projecting surfaces and the transverse surfaces. Alternatively or additionally, the metallic bond can eliminate the projecting surfaces and, additionally or alternatively, the transverse surfaces as interfaces between the heat transfer module and the heat sink. In each embodiment, the fundamental effect is to minimize the thermal transfer resistance between the contact surfaces, which is achieved through the metallic bond (indicated, for example, by the interference fit) or, through the interference fit, is at least essentially equivalent to a thermal bond.

[0016] The heat sink can have a press-fit profile (also known as a second press-fit profile) at the joint that is complementary to the first profile, for example, a shape that is at least partially coordinated for a press fit and that complements or alternatively corresponds to the other. For example, the second profile can have projecting surfaces and transverse surfaces that are complementary to the projecting surfaces and transverse surfaces of the first profile, respectively.

[0017] The first press-fit profile and the second press-fit profile have a coordinated, corresponding shape. Joining elements of the first press-fit profile (e.g., tongues) and joining elements of the second press-fit profile (e.g., grooves) can have different shapes in the unjoined state. Thus, one of the profiles can have a complex geometry with a long periodicity. The other profile can have a simple geometry with half the periodicity.

[0018] Through the coordinated, corresponding shaping, deformation can occur beyond the edge surfaces of the respective press-fit profiles. For example, a straight spring that is arranged perpendicular to the edge of the joint can be reshaped by the press fit from its position aligned perpendicular to the edge of the joint to a position aligned obliquely to the edge of the joint. In addition or alternatively, the spring can take on a curved shape instead of the previous straight course. Since the periodicity of the second press-fit profile is an integer multiple of the periodicity of the first press-fit profile, excluding the simple periodicity of the first press-fit profile, the parts to be joined can optionally be positioned relative to one another during the press-fitting process with the smaller periodicity of the first press-fit profile. This meansThere are a corresponding multiple of positions to permanently connect the first joining part and the second joining part.

[0019] The first press-fit profile can be periodic along a first direction of the first joining part. The second press-fit profile can be periodic along a second direction of the second joining part. For the press-fit of the first press-fit profile and the second press-fit profile, the first joining part can be arranged relative to the second joining part such that the first direction of the first joining part is parallel to the second direction of the second joining part. The tongues of the first press-fit profile can have the higher frequency / repetition rate (in terms of periodicity) relative to the grooves of the second press-fit profile. Furthermore, the periodicity can comprise neutral elements. In the case of the tongues, a neutral element can comprise the omission or shortening of a tongue. In the case of the recesses (for example the grooves), the neutral element can comprise a widened recess without contact.Accordingly, the number of springs may differ from the number of grooves.

[0020] Additionally, the periodicity of the press-fit profiles of the first joining part and, additionally or alternatively, of the second joining part can be defined section by section. Optionally, the profile of the tongues and / or, additionally, the profile of the grooves can vary (e.g., within a section), provided the profiles remain compatible with each other. Compatible profiles can include profiles that continue to provide or effect at least a frictional connection or a positive connection.

[0021] In technical terms, an interference fit is referred to as a "press fit." Alternatively or additionally, an interference fit can be used.

[0022] A joining direction of the press-fitting (ie the direction of movement of the relative movement of the joining parts during press-fitting) can be perpendicular to a surface of the first joining part (which has the first press-fit profile) and additionally or alternatively perpendicular to a second surface of the second joining part (which has the second press-fit profile).

[0023] The press-fitting (also: pressing) can be plastic, i.e. the first press-fit profile and the second press-fit profile are pressed or can be pressed into one another with plastic deformation of the first press-fit profile and additionally or alternatively of the second press-fit profile. Alternatively or additionally, the press-fitting can be plastic because the first press-fit profile and the second press-fit profile are not exactly geometrically complementary. Alternatively or additionally, the press-fitting can be plastic because the first press-fit profile and additionally or alternatively the second press-fit profile are not translation-invariant with respect to the joining direction and additionally or alternatively have an undercut with respect to the joining direction (into which, for example, material of the first press-fit profile flows under plastic deformation during press-fitting).

[0024] The first press-fit profile may have projections. Alternatively or additionally, the second press-fit profile may have grooves.

[0025] Thanks to the press fit and, in addition or alternatively, the metal-to-metal bond, no thermal interface material (TIM) is required in the thermal contact path. This reduces the material costs of the device and eliminates application costs.

[0026] Periodicity, also called cycle or recurrence, generally refers to the property of a thing or process that exhibits a regularity regarding the occurrence of a certain event. The regular series of events is a cycle.

[0027] A joining part is defined as one part of a set of joining parts that serve for mechanical connection and, simultaneously or alternatively, for heat dissipation of electrical components. The joining part typically has joints for joining the joining part to another joining part. The joints can have a periodic press-fit profile. Joinable parts can have identical periodic press-fit profiles or, alternatively, different periodic press-fit profiles. The joining (press-fitting) of the joining parts creates a thermal bridge with considerable mechanical strength.

[0028] The joint is understood to be that section of the first joining part which is pressed with the corresponding joint of the second joining part, so that in the pressed state at least one of the joints has changed its shape, wherein the changed joint has at least partially assumed the shape of the opposite joint.

[0029] The joining element is understood to be the design of the joint, for example in the form of pins, springs, grooves or domes.

[0030] This advantageously doubles the number of options for the relative positioning of the joining parts.

[0031] In embodiments, the first periodic press-fit profile can be formed as a plurality of tongues in a first geometric configuration. The second periodic press-fit profile can be formed as a plurality of recesses, in particular grooves, in at least one second geometric configuration. The first geometric configuration differs from the at least second geometric configuration. The tongues at least partially assume the second geometric configuration during plastic pressing. Optionally, the second geometric configuration can comprise a rear grip. The first geometric configuration and the second geometric configuration do not form a corresponding configuration in the sense that

[0032] The spring (also called a pin) and the recess (also called a groove) are geometrically designed to match one another, apart from the interference for pressing, as already mentioned above. Instead, the first geometric design and the second geometric design differ from one another in such a way that at least the elements of a periodic press-fit profile (the springs) undergo additional deformation during the pressing process in addition to the interference adjustment. The additional deformation can include bending of the springs. For example, the springs can change their orientation during pressing, for example from an orientation parallel to the joining direction to an orientation at an angle to the joining direction. Furthermore, the spring, which was straight before pressing, can be bent. Optionally, the spring can be bent in various ways. The additional deformation is caused by the geometric and structural design of the groove.

[0033] Advantageously, despite a simple and easily scalable geometric design in the form of springs, a low thermal resistance and good mechanical stability of the connection of the joining parts can be achieved.

[0034] In further embodiments, the tongues can have a rectilinear extension. The grooves can have an extension that deviates from the rectilinear extension. Optionally, grooves arranged next to one another have a course that faces one another at least in sections, or grooves arranged next to one another have a course that faces away from one another at least in sections. This can also be understood as a mirror-symmetrical course of the grooves arranged next to one another. The rectilinear extension of the tongues can exclude an angled course. Furthermore, the rectilinear extension of the tongues can include a taper or an increasing thickening. However, it can also exclude them. An extension of the groove that deviates from the rectilinear extension can have a curved course of the groove at least in sections.Alternatively or additionally, an extension of the groove that deviates from the straight extension can also have one or more bends. Furthermore, the straight extension of the groove can also include a taper or an increasing thickening. However, it can also exclude them. Advantageously, a simplified geometric design can reduce the extension (length) of the period of the first joining part and, additionally or alternatively, the second joining part. In other embodiments, the tongues can have the same length and, additionally or alternatively, the grooves can have the same depth.

[0035] The length of the tongues can be shorter than the depth of the grooves so that even when the tongue is fully received in the groove, the tongues do not hit the bottom of the groove. Furthermore, the tongues can be designed so that they can be received in the groove along their entire length. Furthermore, to optimize thermal contact, the deformation of the tongues at the spring origin can be particularly intensive. This advantageously optimizes the expansion in the joining direction of the first joining part, in particular the joint of the first joining part, by eliminating the need for additional width through particularly long tongues. Correspondingly, the expansion in the joining direction of the second joining parts can be optimized by eliminating the need for additional depth through particularly deep grooves. At least one outer edge of the width has the joints on the first joining part or the second joining part.

[0036] In embodiments, the recesses, in particular the grooves, can at least partially have a multiply angled course.

[0037] Due to the multiple angled course of the grooves, the length of the grooves can be extended while maintaining the same depth, in particular by adding parts running perpendicular to the joining direction, preferably close to the root of the tongue (the joint). This thus shortens a heat path between the joining parts. Furthermore, the contact resistance between the groove and tongue is reduced, which reduces the thermal resistance and additionally or alternatively improves it. In addition, the mechanical strength of the press-fit arrangement is improved. In other exemplary embodiments, the first press-fit profile can have flanks that extend at least partially in a straight line parallel to a joining direction of the press-in. Optionally, the first press-fit profile can have tongues that extend at least partially in a straight line parallel to the joining direction.Additionally or alternatively, the second press-fit profile can have flanks with different angles to a joining direction of the press-in. Optionally, the second press-fit profile can have an at least partially V-shaped, converging or diverging groove profile. Additionally or alternatively, the second press-fit profile can have grooves with at least two different groove angles and the first press-fit profile can have projections that extend in the joining direction. Additionally or alternatively, the extension can deviate from the joining direction in a direction that lies between the two different groove angles. Optionally, the first or second press-fit profile can have press lugs, for example with material for filling an opening in the other press-fit profile during press-in.

[0038] Overhang refers to the projection or protrusion of a part of the joining part that is arranged in the joining direction. It can be shaped like a teardrop, rectangle, or triangle and is designed to improve the thermal bridge between the press-fit profiles.

[0039] At least partially straight flanks are flanks that are essentially straight in shape. The tongues are straight, while the recesses (grooves) have a different shape, at least in some sections. Their surface can have protrusions or depressions. The tongues can also be shaped complementarily or contrary to each other.

[0040] Furthermore, the grooves can optionally have an insertion bevel on both sides and alternatively or additionally an insertion rounding and alternatively or additionally a funnel shape in order to achieve a better merging between the spring (also called compression spring) and the groove.

[0041] Advantageously, the defined profiles can ensure the thermal and mechanical connection, which allows for doubling the number of options for the relative positioning of the joining parts. In further embodiments, the second press-fit profile can have a more pronounced contour than the first press-fit profile.

[0042] In this case, more pronounced contouring (i.e. more complex contouring) can mean a larger number of different radii of curvature and orientations in the press-fit profile. In particular, a press-fit profile of lower complexity can be limited to one type of joining points, which can optionally be designed in the same size and orientation. The joining elements can, for example, be designed as tongues, so that a comb-like structure can be present as a press-fit profile. Alternatively, these tongues can be supplemented with projections. Press-fit profiles of greater complexity can comprise various joining elements. For example, different forms of similar joining elements can be included, which can be in the form of grooves. The grooves can have different orientations and, alternatively or additionally, different radii of curvature and, alternatively or additionally, different directions of curvature.

[0043] Periodicity is expressed in the consistent sequence of joining elements that repeat regularly. The simplest periodicity of a press-fit profile is determined by identical joining elements. A more complex periodicity, however, is based on different joining elements.

[0044] The periodicity of the second interference fit profile can be twice or three times or four times, etc., as large as the periodicity of the first interference fit profile.

[0045] Advantageously, a greater difference in contour complexity can create an improved thermal bridge and mechanical connection, with only one press-fit profile requiring a complex and thus expensive design. In other embodiments, the periodicity of the second press-fit profile can be twice as large as the periodicity of the first press-fit profile.

[0046] This allows the first part to be fastened to the second part on a grid corresponding to the smaller periodicity, which encompasses twice as many positions as a conventional press-fit arrangement with the uniform periodicity of both press-fit profiles. In other words, this doubles the possible positions when joining the two parts. In addition to the positions of conventional press-fit arrangements with the uniform periodicity, an intermediate position is possible, halving the distance between two positions.

[0047] This advantageously refines the design of the coupling of the press-fit profiles. In exemplary embodiments, the first joining part and, additionally or alternatively, the second joining part in the press-fit arrangement can comprise or be a heat sink. Optionally, the second joining part can have cooling fins for dissipating heat to the surrounding air. Additionally or alternatively, the first joining part and, additionally or alternatively, the second joining part can comprise or be a heat transport module. Optionally, the first joining part and, additionally or alternatively, the second joining part can have a heat distributor for absorbing heat from one or more electrical components.

[0048] An electrical component can be arranged in one or more modules or on one or more circuit carriers. The components can include linear components (e.g., resistors, capacitors, or inductors) and non-linear components (e.g., transistors), including electromechanical components (e.g., relays or solenoid valves). They can be formed as integral components and include, for example, a power transistor, an integrated circuit, or a processor.

[0049] A heat sink is a body composed of cooling fins and, in addition or alternatively, cooling fins and an (integral) heat spreader. It spreads concentrated heat flows from a heat-producing component and increases the heat-dissipating surface. This reduces the thermal resistance to the heat sink (ambient air). This reduces the temperature difference between the heat sink and the heat source (heat-producing component). The heat source no longer gets as hot. This can prevent potential damage due to overheating of the component.

[0050] Cooling fins (also called cooling lamellas or cooling fins) are used to increase the surface area of ​​a body, for example a heat sink, in order to improve heat transfer to the environment and thus cooling.

[0051] The heat distributor can be technically referred to as a heat spreader.

[0052] In particular, the heat spreaders also serve as spacers (technical term:

[0053] A heat spreader (also known as a "spacer") between a circuit board of the electrical circuit and the heat sink determines the overall height of other components of the electrical circuit. Heat spreaders can also be considered distance-bridging components. From a thermal perspective, the smallest possible distance between the heat sink and the component should be sought. The heat transfer module can be mechanically and thermally conductively connected to the heat sink at a first end of the heat transfer module by means of a press fit at a joint of the heat sink. Alternatively or additionally, the heat transfer module can have a contact surface at a second end of the heat transfer module spaced from the first end, which contact surface is designed to contact at least one heat dissipation point (for example, an electrical circuit) for absorbing the heat.This advantageously ensures the thermal connection of the component to be cooled while at the same time improving the cooling capacity.

[0054] In further embodiments, the press-fit arrangement can be designed to transfer heat from an electrical circuit to a joining part designed as a heat sink and, alternatively or additionally, the press-fit arrangement can be designed as a mechanical holding element.

[0055] The electrical circuit can comprise a plurality of electrical components which dissipate heat during operation. Since the electrical components have different heights and can additionally or alternatively dissipate different amounts of heat, different heat dissipation points can be arranged. The heat dissipation point of the electrical circuit can comprise a heat dissipation point of an electronic component (for example a power transistor, an integrated circuit or a processor). Alternatively or additionally, the at least one heat dissipation point of the electrical circuit can comprise a heat collection point on a circuit carrier (for example on a printed circuit board). The heat collection point can dissipate the heat of several components of the electrical circuit (for example via copper surfaces or conductor tracks of the electrical circuit).Heat collection points, designed, for example, as copper tracks, can also thermally connect decentralized heat-generating components. From there, the heat can then be dissipated centrally.

[0056] The press fit can include a positive fit and, in addition or alternatively, a frictional fit. Optionally, the press fit can include a metal-to-metal bond. With a frictional fit, the joining parts can also act as mechanical retaining elements. For example, instead of a screwed cover for closing a housing, a pressed cover can now be used to close the housing, with comparable holding forces. The mechanical connection can provide such strength that milling of the connected assembly is possible.

[0057] Advantageously, a plurality of heat sources (components of an electrical circuit) can be cooled with a press-fit arrangement.

[0058] In other embodiments, the joining parts may be metallic. Optionally, the joining parts may comprise copper, aluminum, or an alloy containing copper and, additionally or alternatively, aluminum or other materials.

[0059] The high thermal conductivity of the materials combined with mechanical plasticity can advantageously be used to create an efficient thermal bridge with good mechanical strength. In exemplary embodiments, the first press-fit profile can be shorter than the second press-fit profile. The first joining part can be joined to the second joining part along a grid with the periodicity of the first press-fit profile. Alternatively, the second press-fit profile can be shorter than the first press-fit profile, whereby the second joining part can be joined to the first joining part along a grid with the periodicity of the first press-fit profile. Optionally, the first joining part and the second joining part can have different dimensions transverse to the joining direction. Alternatively or additionally, the first press-fit profile and the second press-fit profile can have different dimensions transverse to the joining direction.

[0060] For example, the extent of one of the press-fit profiles of the first press-fit profile and the second press-fit profile can enable the arrangement of a plurality of press-fit profiles with the smaller extent on the press-fit profile with the larger extent. Optionally, press-fit profiles with the smaller extent can be arranged directly adjacent to one another.

[0061] Furthermore, the extension of one of the joining parts of the first joining part and the second joining part can additionally or alternatively enable the arrangement of a plurality of joining parts with the smaller extension on the joining part with the larger extension. Optionally, joining parts with smaller extensions can be arranged directly next to each other to save space.

[0062] This advantageously allows for a finer grid of press-fit profiles, regardless of the length ratio of the press-fit profiles to each other. Another advantage is that a plurality of smaller press-fit profiles or joining parts can be arranged on a larger press-fit profile or joining part.

[0063] In further embodiments, the region of the springs and the region of the recesses can be formed as a joint. The joint of the first joining part can have a higher formability than the joint of the second joining part. In this case, the joint of the first joining part can have a more deformable material relative to the joint of the second joining part and, alternatively or additionally, a thinner design and, alternatively or additionally, a more deformable construction.

[0064] The first joining part with the higher formability can comprise a geometrically simpler design of joining points compared to the second joining part. For example, the joining points of the first joining part with the higher formability can be designed as springs. This can, for example, be implemented in the form of a straight spring perpendicular to a surface of the first joining part.

[0065] The second joining part with the lower formability can comprise the geometrically more complex design of joints relative to the joints of the first joining part and can be designed, for example, as inclined grooves, which can additionally be curved with different radii of curvature. Different materials or substances can be used for the joint of the first joining part and the joint of the second joining part. Accordingly, a material mix can be present with regard to the joint of the first joining part and the joint of the second joining part. Advantageously, the deformability of the first joining part and in particular its joints with higher formability can be structurally facilitated without sacrificing good heat transfer between the press-fit profiles. In other embodiments, the first joining part can be designed as a straight spring.The springs can be designed perpendicular to a surface of the first joining part. Optionally, the springs are designed with a pitch of 2.0 mm to 4.5 mm, preferably with a pitch of 2.5 mm. The pitch of at least 2.0 to 4.5 mm, preferably 2.5 mm, is made possible by miniaturizing the springs, which can be manufactured in these dimensions as an extruded profile. They (still) have sufficient form fit, sufficient preload, and a sufficient contact area with the opposing grooves after press-fitting.

[0066] Advantageously, the extension (length) of the period of the first joining part can be further reduced.

[0067] A second aspect relates to a method for producing a press fit using a press fit arrangement. This comprises providing a first joining part with a periodic first press fit profile. The method further comprises providing a second joining part with a periodic second press fit profile. The periodicity of the second press fit profile is an integer multiple of the periodicity of the first press fit profile, excluding the simple periodicity of the first press fit profile. The method further comprises plastically pressing the first press fit profile into the second press fit profile.

[0068] This advantageously doubles the number of options for the relative positioning of the joining parts.

[0069] The invention is explained in more detail below with reference to the attached drawings using preferred embodiments which can be optionally combined with one another.

[0070] 1 is a schematic diagram of a conventional press-fitting arrangement according to a reference example;

[0071] Fig. 2 is a schematic representation of an inventive press-fit arrangement according to a first aspect;

[0072] Fig. 3 is a schematic representation of an inventive press-fit arrangement according to a first embodiment;

[0073] Fig. 4 is a schematic representation of an inventive press-fit arrangement according to a second embodiment;

[0074] Fig. 5 is a schematic representation of an inventive press-fit arrangement according to a third embodiment; Fig. 6 is a schematic representation of an inventive press-fit arrangement according to a fourth embodiment;

[0075] Fig. 7 is a schematic representation of an inventive press-fitting arrangement according to a fifth embodiment; and Fig. 8 is a schematic representation of an inventive press-fitting method according to a second aspect.

[0076] Fig. 1 shows a schematic representation of a conventional press-fit arrangement 100 according to a reference example. This comprises a first joining part 110, which comprises compression springs 120 for engagement and compression with press grooves 130 in the second joining part 170. The springs (compression springs) 120 are arranged at a certain angle to the joining direction 160, deviating from the joining direction 160 of the compression. The grooves (press grooves) 130 are arranged at a corresponding angle to the joining direction 160. Furthermore, the first joining part 110 comprises press domes 140, which are arranged against the

[0077] The edge of the second joining part 170 is pressed or can be pressed. The tongues 120 are arranged periodically so that their shape repeats at certain intervals. Accordingly, the grooves are arranged with the same period so that when the first joining part 110 is pressed into the second joining part 170, the tongues 120 fit snugly into the grooves 130.

[0078] Fig. 2 shows a schematic representation of an inventive press-fit arrangement 200 according to a first aspect. 1. The press-fit arrangement 200 comprises a first joining part 210 with a periodic first press-fit profile 250. The periodic first press-fit profile 250 is formed by a plurality of joining elements of the joint arranged next to one another, which can be designed, for example, as springs. A second joining part 270 comprises a periodic second press-fit profile 290. This is also formed by a plurality of joining elements of the joint arranged next to one another, which can be designed, for example, as grooves. The joined or joinable joining parts 210, 270 are joined or joinable by plastically pressing the first press-fit profile 250 into the second press-fit profile 290. For this purpose, the first joining part 210 and the second joining part 270 are moved towards each other in the joining direction 260.The periodicity of the second press-fit profile 290 corresponds to an integer multiple of the periodicity of the first press-fit profile 250, but excluding the simple periodicity of the first press-fit profile 250. Optionally, the second geometric configuration comprises an undercut (not shown). Fig. 3 shows a schematic representation of an inventive press-fit arrangement 300 according to a first exemplary embodiment. In the first joining part 310, the first periodic press-fit profile 350 is designed as a plurality of identical first joining elements, which are designed as tongues 320. These form a first geometric configuration. In the second joining part 370, the second periodic press-fit profile 390 is designed as a plurality of identical second joining elements, which are designed as grooves 375, 380. These form a second geometric configuration.The first geometric configuration (springs 320) differs from the second geometric configuration (grooves 375, 380). During plastic pressing, the first geometric configuration (springs 320) at least partially assumes the second geometric configuration (grooves 375, 380).

[0079] The tongues 320 have a rectilinear extension. In contrast, the grooves 375, 380 have an extension that deviates from the rectilinear extension, deviating from the joining direction. Grooves 375, 380 arranged next to one another have, at least in sections (not shown), an alternating course facing one another and, at least in sections (not shown), a course facing away from one another. The first periodic press-fit profile 350 and the second periodic press-fit profile 390 can have corresponding sections that are arranged at the respective spatially identical positions of the press-fit profiles 350, 390, so that they intersect during joining in the joining direction 360. Optionally, the press-fit profiles 350, 390 can also have two or more mutually deviating courses that intersect during joining in the joining direction 360.

[0080] The tongues 320 are arranged parallel to one another and have an identical length, extending parallel to the joining direction 360. The grooves 375, 380 are arranged parallel to one another and extend parallel to the joining direction 360. They also have an identical depth. The tongues 320 and the grooves 375, 380 are arranged correspondingly to one another, so that they intersect when joined in the joining direction 360.

[0081] The grooves 375, 380 have at least partially a multiply angled profile. The profile of the grooves has sections with different angles of inclination relative to the joining direction 360. The section at the groove end has a profile parallel to the joining direction 360. A first press-fit profile 345 has at least partially straight-extending flanks parallel to a joining direction 360 of the press-in. The first press-fit profile 345 has at least partially straight-extending tongues 320 parallel to the joining direction. The second press-fit profile 385 has flanks with different angles to the joining direction 360 of the

[0082] Press-fitting. Furthermore, the second press-fit profile 385 at least partially has a V-shaped, converging or diverging groove profile. The second press-fit profile 385 has grooves with at least two different groove angles. The first press-fit profile 345 has projections (not shown) that extend in the joining direction 360 and, additionally or alternatively, in a direction that lies between the two different groove angles.

[0083] Furthermore, the second press-fit profile 385 is more complex than the first press-fit profile 345. While the arrangement of the identical springs 320 next to one another has a relatively low complexity (less pronounced contouring), the alternating arrangement of the non-rectilinear grooves 375, 380 has a considerably higher complexity (pronounced contouring).

[0084] The periodicity 390 of the second interference fit profile is twice as large as the periodicity 350 of the first interference fit profile. This is indicated by the different arrow lengths 350 and 390.

[0085] The first joining part 310 is designed with straight springs 320. The springs 320 are perpendicular to a surface of the first joining part 310, with the springs 320 being parallel to a surface of the joining part 310. The springs 320 can be designed with a pitch of 2.0 to 4.5 mm, preferably 2.5 mm.

[0086] Fig. 4 shows a schematic representation of an inventive press-fit arrangement 400 according to a second exemplary embodiment. The first joining part 410 has a heat sink (not shown). This can have cooling fins (not shown) for dissipating heat to the air. The heat sink can alternatively or additionally dissipate heat to a liquid coolant in a cooling circuit (not shown). Two second joining parts 470 are designed as heat transport modules. The heat transport modules contact components to be cooled (not shown) on their surface opposite the first joining part 410. On the surface facing the first joining part 410, the heat transport modules have a second periodic press-fit profile 440. This can be designed as a plurality of grooves. The surface of the first joining part 410 facing the heat transport modules has a first press-fit profile 450. This can be designed as a plurality of springs.To enable joining, the grooves and tongues are arranged correspondingly to each other.

[0087] Fig. 5 shows a schematic representation of an inventive press-fit arrangement 500 according to a third exemplary embodiment. The press-fit arrangement 500 is designed to transfer heat to an electrical circuit 540. This comprises components 540 to be cooled, from which the excess heat is dissipated using a second joining part 570 designed as a heat transport module. Fig. 5 shows two components 540 to be cooled, each with an associated partial heat transport module 560 of the heat transport module 570. The electrical circuit 540 further comprises a printed circuit board 540 with electrical connections, on which the two components 540 to be cooled are arranged. Fig. 5 also shows the second joining part 570 with the associated periodic second press-fit profile 590, to which the partial heat transport modules 560 dissipate the excess heat.Finally, the first joining part 510 with the associated periodic first press-fit profile 550 is shown for absorbing the excess heat as well as the joining direction 560.

[0088] The joining parts 510 and 570 are metallic in nature. They can be made of copper, aluminum, or an alloy containing copper and, additionally or alternatively, aluminum. The joining parts 510 and 570 can be made of different materials.

[0089] Fig. 6 shows a schematic representation of an inventive press-fit arrangement 600 according to a fourth exemplary embodiment. The first press-fit profile 650 is shorter than the second press-fit profile 690. Accordingly, the first joining part 610 can be joined to the second joining part 670 along a grid 615 with the periodicity 660 of the first press-fit profile 650. Alternatively, the second press-fit profile 690 can be shorter than the first press-fit profile 650 (not shown), whereby the second joining part 670 can be joined to the first joining part 610 along the grid 615 with the periodicity 660 of the first press-fit profile 650. Optionally, the first joining part 610 and the second joining part 670 have different extensions transverse to the joining direction 680. Additionally or alternatively, the first press-fit profile 650 and the second press-fit profile 690 have different dimensions transverse to the joining direction 670. Fig.7 shows a schematic representation of an inventive press-fit arrangement 700 according to a fifth exemplary embodiment. The region of the tongues 720 and the region of the recesses 775, 780 are designed as a joint. The joint of the first joining part 710 has a higher formability than the joint of the second joining part 770. The joint of the first joining part 710 has a more deformable material compared to the joint of the second joining part 770 and, alternatively or additionally, a thinner design and, alternatively or additionally, a more deformable construction. Accordingly, during joining, the tongues 720 are essentially deformed, so that in addition to the deformation caused by pressing, a deformation is additionally caused by the configuration of the grooves 775, 780. In the joined state, the first press-fit profile 750 and the second press-fit profile 790 have a corresponding profile 730 in their respective contours.This is shown as a line in Fig. 7. Optionally, free spaces can be left (not shown) by shortening the groove base or other deviations in the contours, as explained above.

[0090] Fig. 8 shows a schematic representation of an inventive press-fit arrangement 800 according to a second aspect. The method 800 for producing a press fit using a press-fit arrangement comprises the following steps: Providing 810 a first joining part with a periodic first press-fit profile. The method further comprises providing 820 a second joining part with a periodic second press-fit profile, wherein the periodicity of the second press-fit profile is an integer multiple of the periodicity of the first press-fit profile, excluding the simple periodicity of the first press-fit profile. Finally, the method comprises pressing 830 the first press-fit profile into the second press-fit profile.

[0091] In other words, the invention can also be described as follows: The starting point is a press-fit arrangement 100 (also called a press-fit connection), which consists of a first joining part 110 and a second joining part 170. Both joining parts 110, 170 are pressed into one another in a similar way to a tongue and groove (also called press springs or pin) connection. Depending on the design and application, an effective thermal connection is achieved in conjunction with a stable mechanical connection of the joining parts 110, 170 (also called an interference fit) via an interference compression and, alternatively or additionally, an interference compression with press domes 140 (also called elevations) and, alternatively or additionally, by means of a positive engagement (undercut). The positive engagement can comprise an undercut, in which a loosening of the press-fit arrangement 100 is prevented by a structural design of the joints that overlaps in the joining direction.

[0092] The invention achieves the smallest possible pitch of a press-fit arrangement 300 (press-fit connection) for a flexible fastening of the first joining part 310 to the second joining part 370 of the press-fit arrangement 300. A smaller pitch than known is achieved.

[0093] This is achieved by ensuring that all springs 320 and their spacing from one another are identical. Furthermore, the extension of the springs 320 of the first joining part 310 differs from the grooves 375, 380 of the second joining part 370. For this purpose, the springs 320, in particular, have a straight extension and a straight course (straight springs 320 aligned in the joining direction), while the grooves 375, 380 have a branched course, in particular a simple and, additionally or alternatively, a multiply angled course. Furthermore, two grooves 375, 380 have a course that is inclined toward one another and, alternatively, a course that is turned away from one another. This causes significant plastic deformation of the springs 320 during the press-fitting process.

[0094] By using the identically designed and aligned springs 320 in conjunction with the different and variant configurations of the grooves 375, 380, the pitch of the first joining part 310 relative to the second joining part 370 can be halved. For example, the pitch can be reduced from 5 mm to 2.5 mm. This also halves the overall pitch.

[0095] For example, a distinction from the prior art is shown in that the compression springs (springs) 320 are omni-compatible with the grooves 375 / 380 and that the grooves 375 / 380 are shaped differently from each other and from the compression springs (springs) 320.

[0096] In other words, at least one groove group 375 / 380 with a first shape and orientation identical to each other can exist in relation to at least one further groove group 380 / 375 with a shape identical to each other but different from the first groove group 375 / 380 and a complementary or alternative orientation. The two groove groups 375 / 380 differ in their shape and orientation from the compression springs (springs) 320, which in turn are preferably identically shaped. Omnicompatibility is to be understood as multiple compatibility. Thus, the identical compression springs (springs) 320 of the first joining part can be pressed into differently shaped grooves 375 / 380 of the second joining part, for example, into a left-pivoting groove 375 or a right-pivoting groove 380.

[0097] Reference symbol

[0098] 100 Known press fit arrangements

[0099] 110 First joining part 120 Press spring / spring

[0100] 130 press grooves

[0101] 140 press domes

[0102] 150 Periodic first / second interference fit profile

[0103] 160 Joining direction 170 Second joining part

[0104] 200 press fit arrangement

[0105] 210 First joining part

[0106] 250 periodic first interference fit profile

[0107] 260 Joining direction 270 Second joining part

[0108] 290 Periodic second interference fit profile

[0109] 300 press fit arrangement

[0110] 310 First joining part

[0111] 320 Press springs first joining part 345 First press fit profile

[0112] 350 Periodicity first press fit profile

[0113] 360 joining direction

[0114] 370 Second joining part

[0115] 375 Press grooves second joining part 1st form 380 Press grooves second joining part 2nd form

[0116] 385 Second press-fit profile

[0117] 390 Periodicity second press fit profile

[0118] 400 press fit arrangement

[0119] 410 First joining part 440 Second periodic press fit profile with grooves

[0120] 450 First periodic press-fit profile with cooling fins

[0121] 470 Second joining part, here heat transfer module 500 Press fit arrangement

[0122] 510 First joining part

[0123] 540 electrical circuit with components 550 periodic first press-fit profile

[0124] 560 partial heat transport module

[0125] 570 Second joining part, designed as a heat transport module

[0126] 580 joining direction

[0127] 590 Periodic second interference fit profile 600 Interference fit arrangement

[0128] 610 First joining part

[0129] 615 grid with periodicity of the first press-fit profile

[0130] 650 First press fit profile

[0131] 660 Periodicity first press fit profile

[0132] 670 Second joining part

[0133] 680 joining direction

[0134] 690 Second press-fit profile

[0135] 700 press fit arrangement

[0136] 710 First joining part

[0137] 720 press springs first joining part, joined state

[0138] 730 Corresponding contour of the joints

[0139] 750 First press fit profile, joined state

[0140] 770 Second joining part

[0141] 775 press grooves second joining part 1. form

[0142] 780 press grooves second joining part 2nd form

[0143] 790 Second press-fit profile

[0144] 800 procedures

[0145] 810 Providing a first joining part

[0146] 820 Providing a second joining part

[0147] 830 Pressing

Claims

Claims 1. Press-fit arrangement (200, 300, 400, 500, 600, 700), comprising: a first joining part (210, 310, 410, 510, 610, 710) with a periodic first press-fit profile (250, 345, 550, 650, 750) and a second joining part (270, 370, 470, 570, 670, 770) with a periodic second press-fit profile (290, 385, 590, 690, 790), wherein the joining parts are joined or can be joined by plastically pressing the first press-fit profile (250, 345, 550, 650, 750) into the second press-fit profile (290, 390, 590, 690, 790), characterized in that the periodicity of the second press-fit profile (290) is an integer multiple of the periodicity of the first press-fit profile (250), excluding the simple periodicity of the first press-fit profile (250).

2. Press-fit arrangement (200, 300, 400, 500, 600, 700) according to claim 1, wherein the first periodic press-fit profile (250, 345, 550, 650, 750) is formed as a plurality of springs (320, 720) in a first geometric configuration, and wherein the second periodic press-fit profile (290, 385, 590, 690, 790) is formed as a plurality of recesses, in particular grooves, (375, 380, 775, 780) in at least a second geometric configuration, wherein the first geometric configuration differs from the at least second geometric configuration, wherein the springs (320, 720) at least partially assume the second geometric configuration as a result of the plastic pressing in, optionally wherein the second geometric configuration comprises a rear grip.

3. Press-fit arrangement (200, 300, 400, 500, 600, 700) according to claim 1 or 2, wherein the tongues (320, 720) have a rectilinear extension and wherein the grooves (375, 380, 775, 780) have an extension deviating from the rectilinear extension, optionally wherein grooves (375, 380, 775, 780) arranged next to one another have a course facing one another at least in sections or wherein grooves (375, 380, 775, 780) arranged next to one another have a course facing away from one another at least in sections.

4. Press-fit arrangement (200, 300, 400, 500, 600, 700) according to claim 1 to 3, wherein the springs (320, 720) have an equal length and / or wherein the grooves (375, 380, 775, 780) have an equal depth.

5. Press-fit arrangement (200, 300, 400, 500, 600, 700) according to claim 1 to 4, wherein the recesses, in particular the grooves, (375, 380, 775, 780) at least partially have a multiply angled course.

6. Press-fit arrangement (200, 300, 400, 500, 600, 700) according to claim 1 to 5, wherein the first press-fit profile (250, 345, 550, 650, 750) has flanks extending at least partially in a straight line parallel to a joining direction (260, 360, 580, 680) of the press-in, optionally wherein the first press-fit profile (250, 345, 550, 650, 750) has springs (320, 720) extending at least partially in a straight line parallel to the joining direction (260, 360, 580, 680), and / or wherein the second press-fit profile (290, 385, 590, 690, 790) Flanks with different angles to the joining direction (260, 360, 580, 680) of the press-fitting, optionally wherein the second press-fit profile (290, 390, 590, 690, 790) at least partially has a V-shaped, converging or diverging groove profile, and / or wherein the second press-fit profile (290, 385, 590, 690, 790) has grooves with at least two different groove angles and the first press-fit profile (250, 345, 550, 650,750) has projections extending in the joining direction (260, 360, 580, 680) and / or in a direction lying between the two different groove angles.

7. Press-fit arrangement (200, 300, 400, 500, 600, 700) according to claim 1 to 6, wherein the second press-fit profile (290, 385, 590, 690, 790) has a more pronounced contour than the first press-fit profile (250, 345, 550, 650, 750).

8. Press-fit arrangement (200, 300, 400, 500, 600, 700) according to one of claims 1 to 7, wherein the periodicity (390) of the second press-fit profile is twice as large as the periodicity (350) of the first press-fit profile.

9. Press-fit arrangement (200, 300, 400, 500, 600, 700) according to one of claims 1 to 8, wherein the first joining part (210, 310, 410, 510, 610, 710) and / or the second joining part (270, 370, 470, 570, 670, 770) comprises or is a heat sink (440), optionally cooling fins (450) for dissipating heat to air, and / or wherein the first joining part (210, 310, 410, 510, 610, 710) and / or the second joining part (270, 370, 470, 570, 670, 770) comprises a heat transport module, optionally a Heat spreader for absorbing heat from an electrical component, comprises or is.

10. Press-fit arrangement (200, 300, 400, 500, 600, 700) according to one of claims 1 to 9, wherein the press-fit arrangement (200, 300, 400, 500, 600, 700) for transferring heat of an electrical circuit (540) is a joining part designed as a heat sink and / or wherein the press-fit arrangement (200, 300, 400, 500, 600, 700) is designed as a mechanical holding element.

11. Press-fit arrangement (200, 300, 400, 500, 600, 700) according to one of claims 1 to 10, wherein the joining parts are metallic, optionally wherein the joining parts comprise copper, aluminum or an alloy with copper and / or aluminum as material and / or wherein the material of the first joint and the second joint differ from one another.

12. Press-fit arrangement (200, 300, 400, 500, 600, 700) according to one of claims 1 to 11, wherein the first press-fit profile (250, 345, 550, 650, 750) is shorter than the second press-fit profile (250, 345, 550, 650, 750), whereby the first joining part (210, 310, 410, 510, 610, 710) along a grid (615) with the periodicity (660) of the first press-fit profile (250, 345, 550, 650, 750) with the second joining part (270, 370, 470, 570, 670, 770) can be joined, or wherein the second press-fit profile (290, 385, 590, 690, 790) is shorter than the first press-fit profile (250, 345, 550, 650, 750), whereby the second joining part (670) can be joined to the first joining part (610) along a grid with the periodicity (660) of the first press-fit profile (650), optionally wherein the first joining part (210, 310, 410, 510, 610, 710) and the second joining part (270, 370, 470, 570, 670, 770) have different extensions transverse to the joining direction (260, 360, 580, 680);and / or wherein the first press-fit profile (250, 345, 550, 650, 750) and the second press-fit profile (290, 385, 590, 690, 790) have different extensions transverse to the joining direction (260, 360, 580, 680); 13. Press-fit arrangement (200, 300, 400, 500, 600, 700) according to one of claims 1 to 12, wherein the region of the springs and the region of the recesses are formed as a joint, wherein the joint of the first joining part (210, 310, 410, 510, 610, 710) has a higher formability than the joint of the second joining part (270, 370, 470, 570, 670, 770), wherein the joining point of the first joining part (210, 310, 410, 510, 610, 710) has a more deformable material and / or a thinner design and / or a more deformable construction relative to the joining point of the second joining part (270, 370, 470, 570, 670, 770).

14. Press-fit arrangement (200, 300, 400, 500, 600, 700) according to one of claims 1 to 13, wherein the first joining part (210, 310, 410, 510, 610, 710) is designed with straight springs (320, 720), wherein the springs (320, 720) are designed perpendicular to a surface of the first joining part (310), optionally wherein the springs (320, 720) are designed in a grid dimension of 2.0 to 4.5 mm, preferably of 2.5 mm.

15. A method (800) for producing a press fit using a press fit assembly, comprising: Providing (810) a first joining part with a periodic first press-fit profile, Providing (820) a second joining part with a periodic second press-fit profile, wherein the periodicity of the second press-fit profile is an integer multiple of the periodicity of the first press-fit profile, excluding the simple periodicity of the first press-fit profile, and pressing (830) the first press-fit profile into the second Press fit profile.

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