DE102017206850A1 - A method of joining a heat transfer body to a heat pipe, heat transfer body, and engine to the heat transfer body - Google Patents

Abstract

Disclosed are a method for joining a heat transfer body with a heat pipe, a heat transfer body, and a prime mover with this heat transfer body.

Description

The invention relates to a method for joining a heat transfer body with a heat pipe according to the preamble of patent claim 1, a heat transfer body according to claim 9, as well as an engine with the heat transfer body according to claim 17.

From the prior art units are known which promote hydraulic oil by means of a drive unit formed by an electric motor or a pump from a tank to a hydraulic system. The powered by the unit hydraulic system has a consumer, for. B. a hydraulic cylinder of a machine tool, and control valves.

Such units must be cooled due to the high power density and their efficiency. This concerns in particular the electric motor. It must be avoided overheating and radiating the heat given off by him to surrounding components, especially the hydraulic oil can be prevented.

For cooling of prime movers or electric motors fins or ribs are known, which are arranged on an outer side of a housing of the machine, and over the heat is effectively transferred to the environment. A disadvantage of heat transfer bodies that are surrounded by air is that the achievable cooling flow is comparatively low. In the prior art, therefore, solutions are known which provide heat transfer to a liquid medium.

For example, the document shows DE 10 2013 019 728 an electric motor with a water-cooled, front-side flange, in which a rotor bearing is arranged. The disadvantage here is that such a water-cooled housing part for a motor causes comparatively high costs. Housing of electric motors are advantageously made of aluminum, which may be subject to contact corrosion when flowing through water. In addition, elaborate sealing points are to be provided on said flange, which harbor the risk of leakage and thus of operational failure.

An effective form of heat transfer and separation of the coolant from the housing of the unit to be cooled or the engine to be cooled are so-called heat pipes or heat pipes, in which a coolant in an evaporation zone absorbs heat from the object to be cooled, evaporates, the steam in the connection in a condensation zone of the Heat pipe flows, condenses there and the absorbed heat is delivered to a secondary circuit. Since the heat pipe is a closed system, the mentioned problems of contact corrosion and sealing are eliminated. An example of such a cooling of an electric motor shows the document DE 615 382 A1 ,

Important in the use of heat pipes is their intimate thermal contact with the body to be cooled, in particular with the heat transfer body of the drive machine. In principle, the heat pipes are suitable for mechanical pressing, for example in a groove.

Thus, from the prior art solutions are known in which heat pipes are first inserted into a groove with a sufficient opening cross-section and are subsequently pressed by an effective in the depth direction of the groove pressing movement. Such a method shows the document US 2011 020 377 3 A1 , A disadvantage of these solutions is that the pressing-in process requires a high press-in force, which as a rule can only be applied by machine. It thus requires a lot of effort for alignment and compression of the components involved.

In contrast, the invention has for its object to provide a simpler method for joining a heat transfer body with a heat pipe. Furthermore, the invention is based on the object to provide a heat transfer body, as well as a prime mover with the heat transfer body.

The first object is achieved by a method having the features of claim 1, the second object by a heat transfer body having the features of claim 9 and the third object by a prime mover having the features of claim 17.

Advantageous developments of the method are described in the claims 2 to 8, that of the heat transfer body in claims 10 to 16 and the drive machine in the claims 18 and 19.

A method of joining a heat pipe to a heat transfer body suitable for an engine is based on a step of "injecting a first portion of the heat pipe into a recess of the heat transfer body by means of a press tool". According to the invention, the press-in tool is moved along the first section during pressing in, in particular in contact therewith and in particular under load with a press-in force.

Unlike the known from the prior art press-in process in which the first portion of the heat pipe is pressed simultaneously over its entire length, in this way a lower press-in force can be achieved to add the heat pipe securely to the heat transfer body. In this way, a simpler process is created with less required pressing force.

The first section is preferably an evaporation section of the heat pipe, in which the heat absorbed by the heat transfer body leads to a phase transition liquid to vapor of a medium arranged in the heat pipe.

Preferably, the step "pressing in" is preceded by a step "inserting the first section into the recess".

In one variant, the first section extends over an entire length of the heat pipe.

In a further development, the press-in tool is moved by rolling or rolling on being pressed in at the first section. Alternatively or additionally, the press-in tool can be moved in a further development during pressing on the first section slidably.

In principle, it is possible that the first section undergoes an elastic and / or a plastic deformation by the pressing. A very reliable heat transfer is ensured by means of plastic deformation, since the once taken shape of the heat pipe remains and a permanently defined contact surface between the heat transfer body and heat pipe is given.

In addition to the principle of machine possible implementation of the pressing or the mechanical movement of the press-in tool, a manual movement or actuation of the press-in tool is possible due to the inventive leadership of the press-fit along the first section and the associated, relatively low insertion force. In this way, the method of joining is very flexible and can be designed very inexpensively.

In a development, the press-in tool is a rolling or rolling tool with a handle for manual handling / actuation.

In a further development, a rolling body or rolling elements of the press-in tool dives into the recess in sections, whereby in particular its lateral guidance is given.

In a further development, the press-in tool is moved during pressing in a constant distance to a bottom of the recess and / or to the first portion. In this way, a uniform pressing and deformation of the heat pipe and the production of a uniform heat transfer surface between the heat pipe and the heat transfer body.

In order to ensure a quality of the joining process reliable, the press-in tool is moved when pressed in a development. The guide takes place in particular via stops on the heat transfer body.

In order to ensure a lateral guidance, the press-in tool is moved laterally guided in a further development during pressing on at least one edge of the recess or the heat transfer body.

In order to limit an offset and, alternatively or in addition, the deformation of the heat pipe, in a further development of the method, the press-in tool is supported on at least one edge of the recess or of the heat transfer body during press-fitting.

In order to impress the press-in force with bestimmungsemäßem value along the first section and thus to ensure a Mindesteinpresstiefe and / or a minimum deformation, the press-in tool in a further training during pressing, in particular via a device-down device, held down.

The press tool is preferably moved in a longitudinal direction of the recess or the first portion. In addition, however, the press-in tool can also be moved transversely to the longitudinal direction, in the sense of a width direction of the first section.

In one variant of the method, this has a step of pressing in a second section of the heat pipe, in particular a condensation section of the heat pipe, into a recess of a heat sink by means of a press-fit tool. In this case, the pressing of the second portion, as already done in the first section, along and on the second section.

In this way, with the heat sink with a low insertion force, in particular manually, an intimate contact of the heat pipe can be made.

If a heat sink, with which a second section of the heat pipe is to be joined, a spatially divergent orientation Heat transfer body, the method has in a further development in addition to a step bending the second portion of the heat pipe against the first section. In this way, the heat pipe can be adapted to the geometry of the drive machine, in particular to the housing, in particular to the geometry of the heat transfer body and the heat sink.

If the step of pressing in along the second section does not take place for the second section of the heat pipe, then, in one variant, the second section of the heat pipe can be pressed with or by means of the heat sink of the drive machine. Under pressing is to be understood that the pressing movement is not along a longitudinal extent of the second section, but transverse thereto, in particular normal thereto.

The last-mentioned step of pressing takes place particularly simply when it takes place by means of the heat sink of the drive machine. For example, this can be done by the pressing takes place by means of a fastening of the heat sink to a housing portion of the drive machine, so that the second portion between the housing portion and the heat sink is clamped.

The heat sink is preferably a body through which a cooling medium, in particular water, flows through or can flow, in particular a cooling plate. For this purpose, the cooling plate has at least one coolant channel which, for example, passes through the cooling plate in a meandering manner.

A heat transfer body, which is suitable or provided in particular for cooling a drive machine, for example an electric machine, extends in the form of a jacket, in particular a cylinder jacket. Preferably, it has an elongated extension. It is particularly suitable for receiving a rotor of an electric motor. Preferably, the heat transfer body is suitable as a housing or at least as a housing part for the drive machine. At the heat transfer body extends at least one lamella or rib, preferably a plurality thereof. According to the invention, the lamella or rib has an extending recess into which at least a first portion of a heat pipe can be pressed in a direction transverse to its longitudinal extension.

Preferably, the recess is designed like a groove. In particular, it extends at or along a vertex or crest of the fin or rib.

Preferably, the recess is configured such that the first portion is elastically and / or plastically deformable einpressbar.

Preferably, the recess is configured such that the first section can be pressed in, by pressing in a press-in force, in particular by a press-in tool aufprägbar, along the first section is movable.

In a development, the recess has an undercut in the press-in direction, which corresponds to a direction transverse to the longitudinal extension of the first section of the heat pipe. About this, the heat pipe or the heat pipe section is retained in the recess.

In a preferred embodiment, the heat transfer body has a plurality of such fins or ribs with the respective recess, wherein the fins or ribs are arranged circumferentially on the heat transfer body, in particular externally circumferentially, in particular evenly distributed. In this development, the recess is designed such that this side of the undercut extends an opening of the recess over which the heat pipe or at least the first portion is inserted into the recess. Beyond the undercut, a base of the recess which extends laterally with respect to the opening extends. In these, the heat pipe or the heat pipe section is elastically and / or plastically einpressbar.

In a development of the heat transfer body, the respective recess has an opening in at least one end face of the lamella or rib. In this way, the heat transfer body is prepared that can emerge from the mouth, a second portion of the heat pipe. This is useful, for example, if the second section is to be guided out of the recess without sharp angling or if the second section is intended to be angled against the first section.

In a development of the heat transfer body, a first section of the heat pipe is pressed into the recess by means of a method according to the preceding description.

In a further development of the heat transfer body, the first section is pressed off or rolled off and / or slidably.

In a further development of the heat transfer body, the recess is a groove whose minimum width is equal to or greater than a cross-sectional diameter of a non-pressed portion of the heat pipe.

In a further development of the heat transfer body, the pressed-in first section is in surface contact with the ground.

An engine, in particular an electric machine for driving a hydraulic pump of a drive unit, has a heat transfer body, which has a recess into which a first section of a heat pipe or a heat pipe is pressed. The first section is thereby pressed into the recess by means of a pressing force moved along the first section, in particular by means of a pressing tool moved along the first section. In other words, the first portion is pressed into the recess according to the method described above. In this way, the prime mover is made with high heat transfer from the heat transfer body to the heat pipe at low cost, which is a cost-effective drive machine.

In a further development, the first section is pressed in rolling or rolling, in particular by unrolling or rolling off a press-fit tool on the first section. Alternatively or additionally, the first section is pressed off sliding, in which the press tool was slipped on the first section.

Depending on the type of pressing (rolling, rolling, sliding), the first section may have rolling, rolling and / or Abgleitspuren.

In a development, the heat transfer body is formed by a housing or housing portion of the drive machine. Alternatively, the heat transfer body may be arranged on a housing of the drive machine. Preferably, the heat transfer body has a shell-shaped basic shape or it is designed as a heat transfer jacket, in particular as a cylindrical housing part of the drive machine. Preferably, the heat transfer body, in particular the housing, is manufactured by continuous casting.

In a development, the heat transfer to the heat pipe is particularly effective if the heat transfer body has a lamella or rib on which the recess is arranged.

Preferably, the recess extends along the lamella or rib, in particular along a vertex or a comb of the lamella or rib. In this way, a large contact surface for the heat transfer from the fin or rib is made possible to the heat pipe.

Alternatively, the recess may extend transversely to the lamella or rib, in particular transversely to the vertex. In the latter case, in particular in the presence of a plurality of fins or ribs, the recess extends transversely to the lamellae or fin crests interrupted. In the former case, the recess preferably extends continuously on the lamella or rib.

In a development, the recess is a groove whose minimum width is equal to or greater than a cross section of a free, in particular unpressed, first portion of the heat pipe.

Preferably, the heat transfer body, including the recess or the recesses, manufactured in the continuous casting process.

In order to be able to press the first section securely into the recess and to insert it in a process-reliable manner, the recess has, in a development transverse to its longitudinal extent, a cross-section in the form of a "keyhole". In other words, the recess has a laterally enlarged base, in which the first section is pressed in, and a laterally tapered opening, via which the heat pipe can be inserted for joining.

Preferably, a wall material of the heat pipe is copper. Since this hardly allows elastic deformability, especially in this case, the opening is sufficiently large, in particular larger than the diameter of the heat pipe dimensioned so that the heat pipe can be inserted without deformation.

Preferably, the opening has parallel flanks.

Alternatively, it is possible for the opening to have converging flanks in the press-in direction, so that the heat pipe can be inserted centered in the direction of insertion towards the laterally enlarged base.

In a preferred development, the heat pipe is at least in contact with the ground at least in sections. Then the heat transfer from the heat transfer body to the heat pipe is particularly good. In order to further improve the heat transfer, a heat-conducting medium, in particular a thermal compound, is arranged at least in a region of the contact between the heat pipe and the ground.

In a development, the heat pipe has a second section, in particular a condensation section, which is in contact with a heat sink of the drive machine.

Thus, the heat from the heat transfer body for the evaporation of the medium of the heat pipe can be used on the first section, which subsequently flows in the second section in vapor form and condenses there due to the contact with the heat sink.

In a further development, the heat pipe is integrally formed with its two sections to the housing of the drive machine by the second is angled against the first portion and extends parallel to a housing portion of the prime mover to which the heat sink is attached. This housing section may be, for example, a frontal flange or cover of the housing of the drive machine. At this flange or cover then the heat sink is attached.

In order to ensure a secure hold for the second section on the drive machine, in a development the second section is pressed between the housing section and the heat sink, in particular elastically and / or plastically deformed compressed. In this case, the second section is preferably received in a groove of the housing section or of the heat sink or in grooves of both at least in sections.

A preferred embodiment has, as a heat transfer body on a particular jacket-shaped housing part with a plurality of fins or ribs, which are integrally formed with the housing or which are arranged on the housing. In this case, at least some of the fins or ribs, more precisely their recesses, are each joined to a first section of a respective heat pipe in the manner according to the invention. Furthermore, the second sections of the heat pipes are pressed between the heat sink and the housing section.

The heat pipes, in particular the second sections, preferably extend in a star shape toward a center or a central region of the housing section and / or the heat sink.

Several embodiments of an inventive method, an embodiment of a heat transfer body according to the invention and an embodiment of a drive machine according to the invention are shown in the drawings. With reference to the figures of these drawings, the invention will now be explained in more detail.

• 1 ein Ausführungsbeispiel einer erfindungsgemäßen Antriebsmaschine in einer perspektivischen Ansicht,
• 2 einen erfindungsgemäßen Wärmeübertragungskörper der Antriebsmaschine gemäß 2,
• 3 die Antriebsmaschine gemäß 1 und 2, ohne Wärmerohre, in einer perspektivischen Ansicht,
• 4 einen Schritt Einlegen des Wärmerohres eines ersten Ausführungsbeispiels eines erfindungsgemäßen Verfahrens,
• 5 einen Schritt Einpressen des Wärmerohres gemäß dem ersten Ausführungsbeispiel des Verfahrens,
• 6 einen Schritt Einpressen gemäß einem zweiten Ausführungsbeispiel des Verfahrens,
• 7 die Antriebsmaschine gemäß 1 bis 3 mit einer Kühlplatte und mit eingepressten, sowie mit der Kühlplatte verpressten Wärmerohren, in einer Seitenansicht,
• 8 einen Gehäusedeckel mit eingelegtem Wärmerohr in unverpresstem Zustand der Antriebsmaschine gemäß 1,
• 9 den Gehäusedeckel mit eingelegtem und verpresstem Wärmerohr der Antriebsmaschine gemäß 7,
• 10 ein Ausführungsbeispiel eines erfindungsgemäßen Verfahrens,
• 11 einen Schritt Einpressen des Wärmerohres gemäß einem zweiten Ausführungsbeispiel eines erfindungsgemäßen Verfahrens, und
• 12 einen Schritt Einpressen des Wärmerohres gemäß einem dritten Ausführungsbeispiel eines erfindungsgemäßen Verfahrens.

Show it:

• 1 An embodiment of a drive machine according to the invention in a perspective view,
• 2 a heat transfer body of the drive machine according to the invention 2 .
• 3 the prime mover according to 1 and 2 , without heat pipes, in a perspective view,
• 4 a step inserting the heat pipe of a first embodiment of a method according to the invention,
• 5 a step of pressing in the heat pipe according to the first embodiment of the method,
• 6 a step of pressing in accordance with a second embodiment of the method,
• 7 the prime mover according to 1 to 3 with a cooling plate and pressed-in, and with the cooling plate pressed heat pipes, in a side view,
• 8th a housing cover with inserted heat pipe in the unpressed state of the prime mover according to 1 .
• 9 the housing cover with pickled and pressed heat pipe of the drive machine according to 7 .
• 10 an embodiment of a method according to the invention,
• 11 a step of pressing the heat pipe according to a second embodiment of a method according to the invention, and
• 12 a step of pressing the heat pipe according to a third embodiment of a method according to the invention.

1 shows an engine designed as an electric machine 1 that are elongated along a longitudinal axis 2 extends. It is part of a compact unit within which it drives a hydrostatic machine, in particular a hydraulic pump. The electric machine 1 has a housing 4 , which has three housing parts. A cylindrical housing jacket 6 which in the following as a heat transfer body 6 is referred to, a housing cover 8th over which the case 4 is completed on the front side and a housing cover 10 over which the case 4 is completed at the opposite end. The housing cover 10 is of a drive shaft in the housing 4 arranged rotor (both not shown) of the electric machine 1 interspersed. About the drive shaft, the said hydraulic machine is driven. The housing cover 10 is prepared in such a way that the hydraulic machine can be fastened directly to it.

In operation of the electric machine 1 the resulting heat must be dissipated. For this purpose, the heat transfer body 6 parallel to the longitudinal axis 2 running ribs 12 , These have at their respective apex also parallel to the longitudinal axis 2 extending, groove-like recess 14 on, of which in 1 for reasons of clarity, only one is provided with a reference numeral. In the recesses 14 is each a heat pipe 16 , a so-called heatpipe, with a first section 18 pressed by a method according to the invention. Again, the name of the remaining heat pipes was used 16 and first section 18 omitted for the sake of clarity.

The recesses 14 have at respective end faces 20 . 22 the ribs 12 Muzzles on, leaving the first section 18 into the recess 14 can be inserted and pressed in, without the heat pipe 16 to bend unnecessarily.

The end faces 22 are near the housing cover 8th arranged. The first paragraph 18 thus emerges from the recess 14 over the at the end face 22 arranged mouth. Following is a second section 24 of the heat pipe 16 against the first section 18 at an angle of 90 ° to the longitudinal axis 2 angled. As 1 it can be seen, this affects all heat pipes 16 , The second sections 24 all run from radially outside to the central longitudinal axis 2 to. The second sections 24 however, do not extend all the way to the longitudinal axis 2 but, due to their diameter, terminate at a distance from it.

The housing cover 8th indicates the inclusion of the second sections 24 around the longitudinal axis 2 star shaped milled grooves 26 on, with respect to one in the direction of the longitudinal axis 2 pointing insertion direction of the second sections 24 have no undercut. The grooves 26 thus have a substantially U-shaped cross-section.

Furthermore, the heat transfer body 6 , or the shell-shaped housing part 6 , Clamping grooves 28 on, similar to the recesses 14 into the first sections 18 are inserted, have a cross-section with undercut. At end areas of the clamping grooves 28 in each case an internal thread is formed, in each of which a fastening screw 30 the housing cover 8th . 10 is screwed. In this way, the housing cover 8th . 10 in a simple way with the heat transfer body 6 mechanically connected.

The heat transfer body according to the invention 6 is in 2 shown in a cross-sectional view. Good to see is its jacket-shaped and cylindrical training along the longitudinal axis 2 , Furthermore, the variety of ribs 12 and the four clamping grooves 28 for fastening the housing cover 8th . 10 to recognize. Striking is the cylindrical design of the heat transfer body, including the clamping grooves 28 , In this way, the heat transfer body is suitable 6 very good for the manufacturing process of continuous casting with the embodiment shown was prepared. To the heat transfer between the interior of the electric machine, not shown 1 , the rotor and the like, to the heat pipes 16 according to 1 to optimize is the heat transfer body 6 also made of aluminum.

3 shows for clarification of the recesses 14 , the recording grooves 26 and the clamping grooves 28 the electric machine 1 with removed, or not pressed and pressed, heat pipes 16 , On an outer circumference of the housing cover 8th are parallel to the longitudinal axis 2 four threaded holes 32 provided, via which a heat sink formed as a cooling plate (see FIG. 7 ) on the housing cover 8th is fastened.

4 shows a step of a method according to the invention, which is common to all embodiments of the method. Shown is a rib 12 in cross section. The recess 14 has approximately the shape of a keyhole. Radially outward, ie opposite to in 4 with arrow shown insertion direction, has the recess 14 an opening 34 on. This has parallel side edges 36 , A low-lying section of the recess 14 , also as a reason 38 is opposite the opening 34 laterally expanded, resulting in the said keyhole shape. This way is between the opening 34 and the reason 38 an undercut in the form of a in the longitudinal direction of the recess 14 extending edge 40 educated. Furthermore, it can be seen that the rib 12 with respect to the longitudinal axis 2 tapered radially outward. A with a shell portion of the heat transfer body 6 connected foot section 42 the rib 12 is thus wider than the opening 34 having the vertex of the rib 12 , 4 shows the step Inserting the first section 18 into the recess 14 the rib 12 of the heat transfer body 6 ,

5a now shows a first embodiment of a press-fit tool 44 with which the first section 18 into the recess 14 is pressed according to the invention. Of course, the step presented here is a subsequent step to the in 4 illustrated step "insert" dar. doing 5a a view according to the cross section according to 4 and 5b represents a side view of the process. The illustrated press tool is manually operated in the illustrated embodiment and therefore has a handle 46 about which a server a force F can muster. The press tool 44 has a rolling element 48 , which is designed as a circular cylindrical roller. On its two sides has the rolling element 48 in each case a coaxially arranged circular cylindrical designed stop 50 , In 5a and 5b a step is shown pressing in the first section 18 of the heat pipe 16 into the recess 14 the rib 12 of the heat transfer body 6 by means of the press-fit tool 44 , According to the invention, the pressing is done by moving the press-fit tool 44 along the first section 18 , ie parallel to the longitudinal axis 2 , The user gets the power F on the handle 46 and over this on the rolling elements 48 transfer. According to 5b splits the power F vectorial in a press-fit force F _e and a driving force F _v on. Since the pressing according to the invention on the first section 18 along, that is not at the same time at the complete first section, is done, is the press-in force F _e comparatively low. This allows manual handling, which can be done by muscle power. Especially with small quantities of the prime mover 1 or the heat transfer body 6 with joined heat pipes 16 proves the manual pressing with muscle power as particularly cost, since this no further devices or machine presses are necessary. When using the rolling principle based pressing tool 44 little power is necessary because the heat pipe 18 always only in a small area, in particular linear, and is deformed with little friction loss.

In Einpressvorgängen according to the prior art, in which the complete first section 18 is injected simultaneously, occur significantly higher forces, which requires mechanical support and high costs.

Good to see in 5a that the flanks 36 (only one marked) as a lateral guide for the rolling elements 48 serve. In this way, the operator of the press tool 44 when pressed in by the flanks 36 let lead in the longitudinal direction, which greatly simplifies the press-fitting process for him motor.

6 shows a second embodiment of the pressing of the first section according to the invention 18 into the recess 14 , In this case, also a second embodiment of a press-fit tool 144 used, which the user in the application of force F _e supported.

It should be noted that for the application of the press tool 144 a rib 112 from the rib 12 as they are in the 1 to 5b was shown, deviates.

Accordingly, the rib is 112 configured with rectangular cross section, and does not have the trapezoidal cross section of the preceding embodiment. The recess 14 , including its laterally extended reason 38 and the flank 36 is, however, the same design as in all other embodiments. Accordingly, the same reference numerals have been used. Also the rolling elements 48 and the stop 50 of the press tool 144 correspond to that of the embodiment according to the 5a and 5b ,

To the operator of the manual press tool 144 free from the load, the insertion force F _e to apply, has the press tool 144 a hold-down frame 152 at the over an axis 154 the rolling elements 48 . 50 is rotatably mounted. The hold-down frame 152 extends from a connection bar 156 with two thighs 158 towards the rib 112 , The rib 112 has two lateral grooves 160 on, extending parallel to the recess 14 in the longitudinal direction of the rib 112 erstecken. In the grooves 160 grab the two thighs 158 with their angled end sections 162 one. In this way, a hold-down is formed. The operator of the pressfit tool 144 must at the beginning of the pressing in only the two end sections 162 into the grooves 160 introduce. By means of a particular manual movement of the press tool 144 in the direction of the longitudinal extension of the recess 14 then the pressing in of the first section takes place 18 about the press-in force F _e , Here, the offset is limited by the fact that the attacks 50 on a crest surface 164 the rib 112 are supported, unroll there. According to 6 done by the large press-in force F _e the pressing in of the first section 18 such that this laterally extended reason 38 the recess 14 completely filled. In other words, between the rib 112 and the first section 18 made a completely flat contact, which the heat transfer between the rib 112 and the heat pipe 18 ( 16 , see. 1 ) improved.

7 shows the prime mover 1 according to the 1 to 3 , which are around a designed as a cooling plate heat sink 66 is supplemented. In 7 indicated by dashed lines is a hydraulic machine 68 that via the electric machine, or prime mover 1 is drivable. The prime mover 1 together with the hydraulic machine 68 thus form a drive unit or a so-called compact unit.

The Applicant reserves the right to make a patent claim on a drive unit with the drive machine according to the invention and a hydraulic machine attached to it.

The cooling plate 66 according to 7 is from a coolant channel 70 interspersed with meandering. The first paragraph 18 of the heat pipe 16 takes during operation of the electric machine 1 the waste heat of the electric motor. This is in the first section 18 the medium in the heat pipe evaporates. This is ideally done at the same evaporation temperature, so does not go beyond the evaporation of the medium. The heat transfer is then isothermal. The evaporating medium flows from the first section 18 over the kink in the area of the housing cover 8th in the second section 24 according to 1 , Here now the heat must be given off again. This is done by delivery to the cooling plate 66 , In the second section 24 Thus, there is a re-cooling of the vapor and thus its condensation. The heat of condensation that is released is emitted from the coolant through the channel 70 received incoming coolant.

The cooling plate 66 not only serves to record the heat of condensation of the medium in the second section 24 but also the pressing of the second section 24 , This pressing step is part of the method according to the invention and is in the 8th and 9 shown. According to 8th is the housing cover 8th with inserted second sections 24 the heat pipes 16 shown. Accordingly, the second section 24 still undeformed, in this embodiment, a circular cross-section, configured. In the crimping step, the cooling plate is attached 66 in the direction of the housing cover 8th , The contact pressure is applied via lag screws, which are the cooling plate 66 penetrate and into the threaded holes 32 according to 3 be screwed. In the end position is the cooling plate 66 according to 7 and 9 on the housing cover 8th fixed by screws, with a projection of the second section 24 according to 8th over a surface of the housing cover 8th according to 9 subject to plastic deformation. As 9 shows, here is an intimate area plant of the second section 24 of the heat pipe 16 with the cooling plate 66 realized. As a wall thickness of the cooling plate 66 between the coolant channel 70 and the second section 24 is kept small, a heat flux density is here large and a cooling or re-cooling of the medium in the second section 24 that leads to its condensation, effectively.

10 shows an embodiment of a method according to the invention for joining the heat transfer body 6 , the heat pipes 16 and moreover for joining the prime mover 1 according to 7 So including the attachment of the cooling plate 66 and compressing the second sections 24 the heat pipes 16 ,

In a first step 72, the heat transfer body is manufactured by means of continuous casting. Preferably, this step is done using aluminum because of the high thermal conductivity of the material. This is at least the basic form of the heat transfer body 6 according to 1 . 2 . 3 and 7 produced in one production step. The manufactured heat transfer body 6 shows 2 ,

In another step 74 the bending of the second sections takes place 24 against the first sections 18 the heat pipes 16 (no representation).

In a further step 76, the production of the housing cover takes place 8th with his recording grooves 26 for the second sections 24 , for example by milling. Such a manufactured housing cover 8th shows for example 3 , Unlike the recesses 14 for the first sections 18 the heat pipes 16 become the recording grooves 26 without undercut, ie, U-shaped.

In a further step 78, the insertion of the first sections takes place 18 in the recesses 14 , as well as the second sections 24 in the grooves 26 ,

It follows in the step 80 the pressing in of the first sections according to the invention 18 , for example with one of the press-fit tools 44 ; 144 ; 244 ; 344 , It has the opening 34 a larger opening than a diameter of the first section 18 , so that when inserting no plastic deformation of the first section 18 he follows. In particular, in the preferred because of its conductivity copper for the heat pipes 16 , which is barely elastically deformable, should be the opening 34 larger than the diameter of the unpressed heat pipe 16 to the heat pipe 16 not to deform. The insertion preferably takes place via the opening in accordance with the method described above 34 , so based on the longitudinal axis 2 from radially outside.

Alternatively, the opening 34 but also smaller than the diameter of the heat pipe 16 be so the heat pipe 16 then, for example, axially over the mouth of the recess 14 in the end face 22 the rib 12 can be inserted. In this variant is over the opening 34 then fed only the respective press tool and operated.

The recess 14 that the undercut 40 (Edge), may alternatively be made to the continuous casting process, for example by means of spherical Formfräswerkzeug.

In one step 82 the pressing of the second sections takes place 24 in the housing cover 8th by means of fixing the cooling plate 66 on the housing part, as it is in the 7 to 9 is shown.

The cooling plate 66 preferably performs water as a cooling medium, due to its high enthalpy of enthalpy, whereby high heat flux densities and small heat pipes are made possible.

The use of heat pipes as heat transfer means between the heat transfer body 6 and the heat sink 66 has the advantage that the heat transfer to the heat pipe 16 for evaporation and heat transfer from the heat pipe 16 to the cooling plate 66 for condensation of the heat pipe 16 guided medium leads. In this way, a particularly large heat flux density can be generated, which has a positive effect on the space requirement to be provided for the heat exchange surface. In other words, the space requirement when using the heat pipes 16 low compared to conventional convective air cooling. On top of that, the case 4 the prime mover 1 , unlike water cooling, does not have to carry any water, which eliminates the previously discussed disadvantages of the sealing problem and the risk of failure due to leaks. Compared to this variant, the use of heat pipes is also cheaper.

The 11a and 11b show a variant of the manual pressing of the first section 18 into the recess 14 , The recess corresponds to this 14 , As already in the preceding figures of the basic shape of the keyhole with the radially outwardly facing opening 34 and the reason laterally extended from this 38 , In the embodiment according to the 11 is the handle 46 instead of being attached to a rolling element on a sliding body 248. Instead of rolling as in the embodiment according to the 5a . 5b and 6 now be the press-in force F _e and the driving force F _v about that on the first section 18 sliding-in press tool 244 impressed. The sliding body 248 has a cuboidal basic shape and at its side faces, which point transversely to the sliding outward, each having a slidable stop 250 in the form of a lateral wing or a shoulder. The stop 250 sits on the respective comb surface 164 the rib 12 on. About the stop 250 Thus, the Einpresstiefe is limited. Similar to the rolling element 48 according to the 5a . 5b and 6 the slider 248 gets over the flanks 36 the opening 34 his lateral guidance.

Undoubtedly, the embodiment according to the 11a . 11b comparatively high power requirements to the user, as he for the propulsive power F _v Sliding friction must overcome and also the holding or pressing force F _e must apply.

In a variant, the operator is applying the hold-down or press-in force F _e removed, by a above the slider 248 arranged hold-down 252 is provided. Between the hold down 252 and the first section 18 is in the process step "pressing" 80 thus the slider 248 clamped in the direction of the driving force F _v , which is to be applied by the user, led. Again, there are the attacks again 250 provided that limit the Einpresstiefe. The guide of the slider 248 also takes place here by means of the flanks 36 the opening 34 the recess 14 , For the user, the relief arises that he only has the driving force F _v must apply.

Deviating from the illustrated, the manual press tools 44 ; 144 ; 244 or the semi-manual press tool 344 according to the 12 , of course, also be operated automatically or automatically.

Disclosed is a method for joining a suitable for a prime mover heat transfer body with at least one heat pipe, wherein the heat pipe or a portion thereof is pressed into a recess of the heat transfer body with a moving along the heat pipe press tool.

Also disclosed is a heat transfer body for a drive machine, in particular for an electric machine, which has at least one recess into which a heat pipe can be pressed in.

Furthermore, disclosed is a drive machine, in particular an electric machine, with such a heat transfer body and at least one heat pipe, which is pressed in accordance with the method.

LIST OF REFERENCE NUMBERS

1

prime mover

2

longitudinal axis

4

casing

6

Heat transfer body

8, 10

housing cover

12; 112

rib

14

recess

16

heat pipe

18

first section

20, 22

end face

24

second part

26

receiving groove

28

clamping groove

30

fixing screw

32

threaded hole

34

opening

36

flank

38

reason

40

edge

42

foot section

44; 144; 244; 344

press tool

46

Handle

48

rolling elements

50; 250

attack

152; 252

Hold down frame

66

heatsink

68

hydromachine

70

Coolant channel

72 to 78

step

80

Process step Press-fitting

82

Process step crimping

154

axis of rotation

156

connecting beams

158

leg

160

groove

162

end

164

comb surface

F

force

F _e

Insertion force

F _v

propulsive force

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 102013019728 [0005]
• DE 615382 A1 [0006]
• US 20110203773 A1 [0008]

Claims (20)

Method for joining a heat pipe (16) with a heat transfer body (6), which is particularly suitable for cooling a drive machine (1), with a step - pressing (80) a first section (18) of the heat pipe (16) into a recess ( 14) of the heat transfer body (6) by means of a press-fit tool (44; 144; 244; 344), characterized in that the press-fit tool (44; 144; 244; 344) is moved along the first section (18) during pressing. Method according to Claim 1 wherein the press-fit tool (44; 144) is unrolled or rolled on press-fitting (80) on the first section (18), or wherein the press-fit tool (244; 344) is slidably moved on press-fitting on the first section (18). Method according to Claim 1 or 2 in that the press-fit tool (44; 144; 244; 344) is moved or actuated manually or mechanically or partially manually during the press-fitting (80). Method according to one of Claims 1 to 3 in that the press-fit tool (44; 144; 244; 344) is moved at a constant distance from the heat transfer body (18) during pressing (80). Method according to one of the preceding claims, wherein the press-fit tool (44; 144; 244; 344) is moved laterally during pressing in (80) on at least one edge (36; 160) of the recess (14) or the heat transfer body (112). A method according to any one of the preceding claims, wherein the press-fit tool (144; 244; 344) is supported on at least one edge (164) of the recess (14) or the heat transfer body during press-fitting (80). Method according to one of the preceding claims, wherein the press-fit tool (44; 144; 244; 344) during pressing (80) is held down manually (44; 244) or device-wise (144; 344). Method according to one of the preceding claims, comprising a step of pressing (82) a second section (24) of the heat pipe (16) with or by means of a heat sink (66) of the drive machine (1). Heat transfer body, in particular for cooling a drive machine (1), which extends in the form of a jacket, and on which at least one lamella or rib (12; 112) is formed, characterized in that a recess (12; 112) is formed on the lamella or rib (12; 14) into which at least a first portion (18) of a heat pipe (16) can be pressed in a direction transverse to its longitudinal extension. Heat transfer body after Claim 9 , wherein the recess (14) in the press-in direction has an undercut (40). Heat transfer body after Claim 10 , wherein on this side of the undercut (40) an opening (34) of the recess (14) extends over which the heat pipe or the heat pipe section (18) in the recess (14) can be inserted, and wherein beyond the undercut (40) a extends laterally extended base (38) of the recess (14) relative to the opening (14) into which the heat pipe or the heat pipe section (18) can be pressed. Heat transfer body according to one of Claims 9 to 11 wherein the recess (14) has an orifice in at least one end face (20, 22) of the fin or rib (12; 112). Heat transfer body according to one of Claims 9 to 12 wherein in the recess (14, 38) a first portion (18) of the heat pipe (16) by a method (80) according to one of Claims 1 to 8th is pressed. Heat transfer body after Claim 13 , wherein the first portion (18) is pressed off rolling or rolling and / or sliding off. Heat transfer body according to one of Claims 9 to 14 wherein the recess (14) is a groove whose minimum width is equal to or greater than a cross-sectional diameter of a non-pressed portion of the heat pipe (16). Heat transfer body at least after Claim 11 and 13 wherein the pressed-in first portion (18) is in face contact with the base (38). Driving machine, in particular electric machine (1), with a heat transfer body (6), which according to one of Claims 9 to 16 is designed. Drive machine after Claim 17 with a heat transfer body (6) after Claim 13 wherein a second portion (24) of the heat pipe (16) is in contact with a heat sink (66) of the prime mover (1). Drive machine after Claim 18 , wherein the second portion (24) is angled towards the first portion (18) and parallel to a Housing portion (8) of the drive machine (1) extends, on which the heat sink (66) is attached. Drive machine after Claim 19 wherein the second portion (24) between the housing portion (8) and the heat sink (66) is pressed.

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