CN108731524B

CN108731524B - Method for joining heat transfer body to heat pipe, heat transfer body, and drive machine having heat transfer body

Info

Publication number: CN108731524B
Application number: CN201810366053.3A
Authority: CN
Inventors: A.金德; R.许特尔
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2017-04-24
Filing date: 2018-04-23
Publication date: 2023-02-21
Anticipated expiration: 2038-04-23
Also published as: CN108731524A; DE102017206850A1

Abstract

Disclosed are a method of joining a heat transfer body to a heat pipe, a heat transfer body, and a driving machine having the heat transfer body.

Description

Method for joining heat transfer body to heat pipe, heat transfer body, and drive machine having heat transfer body

Technical Field

The present invention relates to a method for joining a heat transfer body with a heat pipe according to the preamble of claim 1, a heat transfer body according to claim 9, and a drive machine with a heat transfer body according to claim 17.

Background

Assemblies are known from the prior art which supply hydraulic oil from a tank to a hydraulic system by means of a drive unit formed by an electric motor or a pump. The hydraulic system supplied by the assembly has a load (e.g., a hydraulic cylinder of a machine tool) and a control valve.

Such assemblies must be cooled due to the high power density and efficiency of the assembly. This relates in particular to electric motors. Overheating of the electric motor must be avoided and the heat emitted by the electric motor to the surrounding components, in particular the hydraulic oil, must be prevented.

For cooling the drive machine or the electric motor, laminations or ribs arranged at the outside of the housing of the machine are known and heat can be efficiently transmitted to the surroundings by the laminations or ribs. A disadvantage of heat transfer bodies which are purely air-circulated is that the cooling flow which can be achieved is relatively small. Therefore, solutions are known in the prior art which provide for the transfer of heat to a liquid medium.

For example, publication DE 10 2013 019 728 shows an electric motor with a water-cooled end flange in which a rotor bearing is arranged. It is disadvantageous here that such water-cooled housing parts for electric motors are associated with relatively high costs. The housing of the electric motor is advantageously made of aluminum, which may be subject to contact corrosion when there is a through-flow of water. In addition, cumbersome sealing positions are provided on the mentioned flanges, which entail a risk of leakage and thus a risk of operational failure.

A so-called heat pipe or heat pipe is an effective form of heat transfer and separation of the coolant from the housing of the assembly to be cooled or the housing of the drive machine to be cooled, in which the coolant in the evaporation zone absorbs heat from the object to be cooled, evaporates, and then the vapor flows into the condensation zone of the heat pipe, where it condenses, and the absorbed heat is output to the secondary circuit. Since the heat pipe represents a closed system, the mentioned problems of contact corrosion and sealing are eliminated. Publication DE 615 382 A1 shows an example of such a cooling for an electric motor.

The use of heat pipes is important when the heat pipe is in thermal contact with the object to be cooled, in particular with the heat transfer body of the drive machine. In principle, the heat pipe is suitable for mechanical pressing, for example in a tank.

Solutions are therefore known from the prior art, in which, first, a heat pipe is inserted into a groove with a sufficiently open cross section, and is subsequently pressed in by an effective pressing movement in the depth direction of the groove. Publication US 2011 020 377 A1 shows such a method. A disadvantage of these solutions is that the pressing-in process requires a high pressing-in force, which can usually only be applied by machine. Thus requiring higher costs to orient and extrude the involved components.

Disclosure of Invention

In contrast, the object of the present invention is to provide a simpler method for joining a heat transfer body to a heat pipe. The invention is also based on the object of providing a drive machine having a heat transfer body.

The first task is solved by a method having the features of claim 1, the second task is solved by a heat transfer body having the features of claim 9 and the third task is solved by a drive machine having the features of claim 17.

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

A method for joining a heat pipe to a heat transfer body, which is particularly suitable for a drive machine, is based on the step "pressing a first section of the heat pipe into a recess of the heat transfer body by means of a pressing tool". According to the invention, during the pressing-in, the pressing-in tool is moved along the first section, in particular is brought into contact with the first section and is acted upon, in particular by a pressing-in force.

In contrast to the pressing-in process known from the prior art, in which the first section of the heat pipe is pressed in simultaneously over the entire length of the heat pipe, in this way a low pressing-in force can be achieved in order to reliably engage the heat pipe with the heat transfer body. In this way a simpler method with less required press-in force is provided.

Preferably, the first section is an evaporation section of the heat pipe, in which depression section the heat absorbed by the heat transfer body causes a phase change of the medium arranged in the heat pipe from liquid to vapor.

Preferably, the step of "inserting the first section into the void" is performed before the step of "pressing in".

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

In a further embodiment, the pressing tool is moved in a rolling or rolling manner at the first section during the pressing-in. Alternatively or additionally to this, in a variant, the pressing tool can be moved in a sliding manner during the pressing in at the first portion.

In principle, it is possible for the first section to be elastically and/or plastically deformed by the pressing-in. Reliable heat transfer is ensured by means of plastic deformation, since the shape of the heat pipe adopted in one piece is retained and a continuously defined contact surface between the heat transfer body and the heat pipe is provided.

In addition to the fact that the pressing-in or the mechanical movement of the pressing-in tool can in principle be carried out by a machine, a manual movement or actuation of the pressing-in tool is possible due to the inventive guidance of the pressing-in tool along the first section and the associated relatively low pressing-in forces. In this way, the method for joining can be constructed very flexibly and very cost-effectively.

In a variant, the pressing tool is a rolling or rolling tool with a handle for manual operation/manipulation.

In one embodiment, the rolling bodies or rolling body regions of the pressing tool are embedded in sections in the recess, so that in particular a lateral guidance of the pressing tool is provided.

In a further embodiment, the pressing tool is moved at a constant distance from the base of the recess and/or from the first section during the pressing-in. In this way, a uniform pressing-in and deformation of the heat pipe and a uniform heat transfer surface between the heat pipe and the heat transfer body are performed.

In order to ensure a reliable process for the quality of the joint, in a variant the pressing tool is moved in a guided manner during the pressing-in process. In this case, the guiding takes place in particular by a stop at the heat transfer body.

In order to ensure lateral guidance, in one variant, the pressing tool is guided laterally at least one edge of the recess or of the heat transfer body during pressing-in.

In order to define the pressing-in depth and alternatively or additionally the deformation of the heat pipe, in a variant of the method, the pressing-in tool is supported at least one edge of the recess or at least one edge of the heat transfer body during the pressing-in.

In order to apply a pressing force having a predetermined value along the first section and thus ensure a minimum pressing depth and/or a minimum deformation, in a variant the pressing tool is pressed during pressing, in particular by means of a pressing device in terms of device technology.

The pressing tool is preferably moved in the longitudinal direction of the recess or the first section. Additionally, the pressing tool can also be moved transversely to the longitudinal direction in the sense of the width direction of the first section.

In one variant of the method, the method has the steps of: the second section of the heat pipe, in particular the condensation section of the heat pipe, is pressed into the recess of the heat sink by means of a pressing tool. Here, as already in the first section, the second section is pressed in along and at the second section.

In this way, a tight contact of the heat pipe with the heat sink can also be established with a low pressing force, in particular manually.

If the cooling body, which engages with the second section of the heat pipe, has a spatially offset orientation with respect to the heat transfer body, in a variant the method also has the step of bending the second section of the heat pipe relative to the first section. In this way, the heat pipe can be adapted to the geometry of the drive machine, in particular to the housing of the drive machine, in particular to the geometry of the heat transfer body and the cooling body.

If no step of pressing in along the second portion of the heat pipe is carried out for the second portion of the heat pipe, in one variant, the pressing of the second portion of the heat pipe can be carried out by means of or by means of a cooling body of the drive machine. Here, the term "pressing" is understood to mean that the pressing movement does not take place along the longitudinal extent of the second portion but transversely thereto, in particular perpendicularly thereto.

The last-mentioned extrusion step takes place particularly simply when the extrusion takes place with the aid of the cooling body of the drive machine. This can be done, for example, by pressing by means of fastening the cooling body at the housing section of the drive machine, so that the second section is sandwiched between the housing section and the cooling body.

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

The heat transfer body extends in the form of a jacket, in particular a cylinder jacket, and is particularly suitable for or provided for cooling a drive machine, for example an electric motor. Preferably, the heat transfer body has an elongated extension. The heat transfer body is particularly suitable for accommodating a rotor of an electric motor. Preferably, the heat transfer body is adapted as a housing or at least as a housing part of the drive machine. At least one, preferably a plurality of laminations or ribs extend at the heat transfer body. According to the invention, the lamination or the rib has an extended recess into which at least one first section of the heat pipe is pressed in a direction transverse to the longitudinal extension of the heat pipe.

Preferably, the voids are of a slot-like configuration. In particular, the voids extend at or along the apex or hump (Kamm) of the laminations or ribs.

Preferably, the recess is configured such that the first section is pressed in an elastically and/or plastically deformable manner.

Preferably, the recess is configured to enable the first section to be pressed in by enabling a pressing-in force, which can be applied in particular by a pressing-in tool, to be moved along the first section during pressing-in.

In a further embodiment, the recess has an undercut in a pressing-in direction, which corresponds to a direction transverse to the longitudinal extent of the first section of the heat pipe. The undercut can retain the heat pipe or the heat pipe section in the recess.

In a preferred variant, the heat transfer body has a plurality of such laminations or ribs with corresponding recesses, wherein the laminations or ribs are arranged at the heat transfer body on the periphery, in particular on the outer periphery, in particular in a uniformly distributed manner. In this variant, the recess is configured such that an opening of the recess, through which the heat pipe or at least the first section of the heat pipe can be inserted into the recess, extends on the side of the undercut. The bottom of the recess, which extends transversely with respect to the opening, extends on the side of the undercut. The heat pipe or the heat pipe section can be pressed into the base elastically and/or plastically.

In a variant of the heat transfer body, the respective interspace has a mouth in at least one end side of the lamination or rib. In this way the heat transfer body is prepared such that the second section of the heat pipe can protrude from the mouth. This makes sense, for example, if the second section without a sharp bend is guided out of the recess or if the second section is bent relative to the first section.

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

In a variant of the heat transfer body, the first section is pressed in a rolling or rolling and/or sliding manner.

In a variant of the heat transfer body, the recess is a groove, the smallest width of which is equal to or greater than the cross-sectional diameter of the non-compressed section of the heat pipe.

In a variant of the heat transfer body, the pressed-in first section is in flat contact with the bottom.

The drive machine, in particular an electric motor for driving a hydraulic pump of a drive unit, has a heat transfer body with a recess into which a heat pipe or a first section of a heat pipe is pressed. The first section is pressed into the recess by means of a pressing force which moves along the first section, in particular by means of a pressing tool which moves 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 driver machine is manufactured at low cost while the heat transfer from the heat transfer body to the heat pipe is high, so that this is a cost-effective driver machine.

In a further embodiment, the first section is rolled or rolled in, in particular by rolling or rolling the pressing tool at the first section. Alternatively or additionally, the first section is slidingly depressed by sliding a pressing tool at the first section.

Depending on the type of pressing in (rolling, sliding), the first section can have rolling marks, rolling marks and/or sliding marks.

In one variant, the heat transfer body is formed by a housing or a housing section of the drive machine. Alternatively, the heat transfer body can be arranged at the housing of the drive machine. The heat transfer body preferably has an outer sleeve-like basic form or is designed as a heat transfer sleeve, in particular as a cylindrical housing part of the drive machine. Preferably, the heat transfer body, in particular the housing, is manufactured in a continuous casting process.

In a variant, the heat transfer to the heat pipe is particularly effective when the heat transfer body has laminations or ribs, at which the voids are arranged.

Preferably, the voids extend along the laminations or ribs, in particular along the apexes or peaks of the laminations or ribs. In this way, a large contact surface for heat transfer from the lamination or the rib to the heat pipe is achieved.

Alternatively, the voids may extend transversely to the laminations or ribs, in particular transversely to the apex. In the latter case, in particular in the case of a plurality of laminations or ribs, the interspace extending transversely to the apex of the laminations or ribs is interrupted. In the former case, the voids preferably extend continuously at the laminations or ribs.

In a further embodiment, the recess is a groove, the smallest width of which is equal to or greater than the cross section of the free, in particular non-compressed, first section of the heat pipe.

Preferably, the heat transfer body, including the one or more voids, is manufactured in a continuous casting process.

In order to be able to press the first portion reliably into the recess and insert it reliably beforehand, the recess has a cross section in the form of a "keyhole" in one variant, transversely to the longitudinal extent of the recess. In other words, the interspace has a laterally expanded bottom, into which the first section is pressed, and a laterally tapered opening, through which the heat pipe is inserted for engagement.

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

Preferably, the openings have parallel edges.

Alternatively, it is possible for the opening to have a converging edge in the pressing-in direction, so that the heat pipe can be inserted centrally in the insertion direction toward the laterally extended base.

In a preferred variant, the heat pipe is at least in a segmented, planar contact with the base. The thermal transition from the heat transfer body to the heat pipe is then particularly good. In order to further improve the heat transport, a heat-conducting medium, in particular a heat-conducting paste, is arranged at least in the contact area between the heat pipe and the base.

In one variant, the heat pipe has a second section, in particular a condensation section, which is in contact with the cooling body of the drive machine.

Heat from the heat transfer body can thus be used at the first section for evaporating the medium of the heat pipes, which then flows in vapor form into the second section and condenses there as a result of contact with the cooling body.

In one variant, the second section is bent toward the first section and extends parallel to the housing section of the drive machine, the heat pipe being formed with two sections of the heat pipe to the housing of the drive machine, the cooling body being fixed at the housing section. The housing section can be, for example, an end-side flange or a cover of the housing of the drive machine. The cooling body is then fastened at the flange or cover.

In order to ensure a secure fastening of the second section to the drive machine, in a variant the second section is pressed between the housing section and the heat sink, in particular elastically and/or plastically deformed. The second section is preferably accommodated in the housing section or in a groove of the heat sink or in both the housing section and the heat sink at least in sections.

A preferred embodiment has a housing part, in particular in the form of a jacket, as the heat transfer body, with a plurality of laminations or ribs, which are formed integrally with the housing or are arranged on the housing. In this case, at least some of the webs or ribs, more particularly their recesses, engage in a manner according to the invention in each case one first section of the respective heat pipe. Furthermore, the second section of the heat pipe is pressed between the heat sink and the housing section.

Preferably, the heat pipe, in particular the second section, extends in a star-like manner to a center point or a central region of the housing section and/or of the heat sink.

In the drawings, there are shown several embodiments of the method according to the invention, embodiments of the heat transfer body according to the invention and embodiments of the drive machine according to the invention. The invention will now be explained in more detail on the basis of said figures.

Drawings

The figure is as follows:

figure 1 shows an embodiment of the drive machine according to the invention in a perspective view,

figure 2 shows a heat transfer body according to the invention of the drive machine according to figure 2,

figure 3 shows the drive according to figures 1 and 2 without heat pipes in a perspective view,

figure 4 shows the step of inserting a heat pipe according to a first embodiment of the method of the invention,

figure 5 shows the step of pressing in a heat pipe according to the first embodiment of the method,

figure 6 shows the steps of pressing in according to a second embodiment of the method,

fig. 7 shows a side view of a drive machine according to fig. 1 to 3, which has a cooling plate and has heat pipes pressed in and pressed against the cooling plate,

figure 8 shows the housing cover according to figure 1 with the heat pipe inserted in the state in which the drive machine is not pressed,

figure 9 shows a housing cover with inserted and compressed heat pipes of the drive machine according to figure 7,

figure 10 is an embodiment of a method according to the invention,

FIG. 11 shows the step of pressing in a heat pipe according to a second embodiment of the method according to the invention, and

fig. 12 shows the step of pressing in a heat pipe according to a third embodiment of the method according to the invention.

Detailed Description

Fig. 1 shows a drive machine 1 which is designed as an electric motor and which extends longitudinally along a longitudinal axis 2. The drive machine is part of a compact assembly in which it drives a hydrostatic machine, in particular a hydraulic pump. The electric motor 1 has a housing 4 with three housing parts: a cylindrical jacket 6, which is referred to below as the heat transfer body 6, a housing cover 8, by means of which the housing 4 is closed at the end side, and a housing cover 10, by means of which the housing 4 is closed at the opposite end side. The housing cover 10 is penetrated by a drive shaft of a rotor (both not shown) of the electric motor 1, which rotor is arranged in the housing 4. The mentioned hydraulic machines can be driven by means of a drive shaft. The housing cover 10 is prepared here such that the hydraulic machine can be fastened directly thereto.

During operation of the electric motor 1, the heat generated in this case must be dissipated. For this purpose, the heat transfer body 6 has ribs 12 which extend parallel to the longitudinal axis 2. These ribs also have groove-like recesses 14 at their respective apexes, which extend parallel to the longitudinal axis 2, of which only one rib is provided with a reference numeral in fig. 1 for the sake of clarity. According to the method according to the invention, heat pipes 16, each having a first portion 18, so-called heat pipes, are pressed into the recess 14. For clarity, reference to the remaining heat pipes 16 and first sections 18 is also omitted herein.

The interspace 14 has a mouth at the respective end sides 20, 22 of the ribs 12, so that the first section 18 can be inserted and pressed into the interspace 14 without unnecessarily bending the heat pipe 16.

The end side 22 is arranged close to the housing cover 8. The first section 18 thus emerges from the recess 14 via a mouth arranged at the end face 22. Next, the second section 24 of the heat pipe 16 is bent at an angle of 90 ° to the longitudinal axis 2 with respect to the first section 18. As can be seen from fig. 1, this relates to all heat pipes 16. The second portions 24 all open out radially to the central longitudinal axis 2. In this case, however, the second section 24 does not extend as far as the longitudinal axis 2, but ends at a distance from the latter due to its diameter.

The housing cover 8 has a star-milled receptacle groove 26 around the longitudinal axis 2 for receiving the second portion 24, which receptacle groove has no undercuts with respect to the insertion direction of the second portion 24, which is directed in the direction of the longitudinal axis 2. The groove 26 thus has a substantially u-shaped cross-section.

Furthermore, the heat transfer body 6 or the jacket-like housing part 6 has a clamping groove 28, which, like the recess 14, has a cross section with an undercut, into which the first section 18 is inserted. At the end regions of the clamping grooves 28, in each case, an internal thread is formed into which the respective fastening screw 30 of the housing covers 8, 10 is screwed. In this way, the housing covers 8, 10 are mechanically connected to the heat transfer body 6 in a simple manner.

In fig. 2a heat transfer body 6 according to the invention is shown in cross-section. The outer jacket-like and cylindrical design of the heat transfer body along the longitudinal axis 2 is well visible. Furthermore, a plurality of ribs 12 and four clamping grooves 28 are visible for fixing the housing covers 8, 10. The cylindrical design of the heat transfer body including the clamping groove 28 is significant. In this way, the heat transfer body 6 is very well suited for a continuous casting manufacturing method, with which the illustrated embodiment has been manufactured. In order to optimize the thermal transition between the internal structure, not shown, of the electric motor 1, the rotor, etc., at the heat pipe 16 according to fig. 1, the heat transfer body 6 is furthermore made of aluminum.

Fig. 3 shows the electric motor 1 with the heat pipe 16 removed or not pressed in and pressed out, in order to illustrate the recess 14, the receiving groove 26 and the clamping groove 28. Four threaded bores 32 are arranged parallel to the longitudinal axis 2 at the outer circumference of the housing cover 8, through which threaded bores a cooling body (see 66, fig. 7) designed as a cooling plate can be fastened to the housing cover 8.

Fig. 4 shows the steps of the method according to the invention, which are common to all embodiments of the method. The ribs 12 are shown in cross-section. The void 14 has approximately the shape of a keyhole (schlusselloch). Radially outwards, i.e. opposite to the pressing-in direction shown by the arrow in fig. 4, the recess 14 has an opening 34. The openings have parallel arranged side edges 36. The lower section of the void 14 (also referred to as the bottom 38) expands laterally relative to the opening 34, resulting in the noted keyhole shape. In this way, an undercut in the form of an edge 40 extending in the longitudinal direction of the recess 14 is formed between the opening 34 and the bottom 38. Furthermore, it can be seen that the ribs 12 taper radially outwardly relative to the longitudinal axis 2. The foot section 42 of the rib 12 connected with the jacket section of the heat transfer body 6 is thus wider than the apex of the rib 12 with the opening 34. Fig. 4 shows a step of inserting the first section 18 into the interspaces 14 of the ribs 12 of the heat transfer body 6.

Fig. 5a now shows the pressing tool 44In a first embodiment, the first portion 18 is pressed into the recess 14 according to the invention using the pressing tool. Of course, the steps shown here represent the steps subsequent to the "insert" step shown in FIG. 4. Fig. 5a shows a view according to the cross section according to fig. 4, and fig. 5b shows a side view of the process. The illustrated pressing tool can be operated manually in the illustrated embodiment and thus has a handle 46 by which an operator can apply the force F. The pressing-in tool 44 has rolling bodies 48 in the form of cylindrical rollers. The rolling bodies 48 each have coaxially arranged stops 50 of cylindrical design on both sides of the rolling bodies. Fig. 5a and 5b show the step of pressing the first section 18 of the heat pipe 16 into the recesses 14 of the ribs 12 of the heat transfer body 6 by means of a pressing tool 44. According to the invention, the pressing in is carried out by moving the pressing tool 44 along the first section 18, i.e. parallel to the longitudinal axis 2. The user transmits a force to the handle 46 and via said handle to the rolling bodies 48. According to fig. 5b, the force F vector is decomposed into the pressing-in force F _e And a propulsive force F _v . Since the pressing-in takes place according to the invention along the first portion 18, i.e. not simultaneously over the entire first portion, the pressing-in force F _e Is relatively low. This enables a manual operation, which can be done by means of muscular strength. In particular in the case of a small number of drive machines 1 or heat transfer bodies 6 with joined heat pipes 16, manual pressing with muscular force has proven to be particularly cost-effective, since no additional devices or mechanical pressing are required for this purpose. When using a pressing-in tool 44 based on the rolling principle, a low force is required, since the heat pipe 18 is always deformed only in a small area, in particular in the form of a line, and with little frictional losses.

During the pressing-in process according to the prior art, in which the entire first portion 18 is pressed in at the same time, significantly higher forces occur, which require mechanical assistance and involve high costs.

As can be seen well in fig. 5a, the rims 36 (only one rim is marked) serve as lateral guides for the rolling bodies 48. In this way, the operator of the pressing-in tool 44 can be guided in the longitudinal direction by the rim 36 during pressing-in, which considerably simplifies the pressing-in process for the pressing-in tool in terms of the motor.

Fig. 6 shows a second exemplary embodiment of the pressing of the first portion 18 into the recess 14 according to the invention. Also used herein is an auxiliary user-applied force F _e Second embodiment of the pressing tool 144 _。

It is noted that the ribs 112 are offset from the ribs 12 for use of a press-in tool 144, as shown in fig. 1 to 5 b.

Thus, the ribs 112 are configured with a rectangular cross-section and do not have the trapezoidal cross-section of the previous embodiment. However, the void 14 (including its laterally extending bottom 38 and rim 36) is also constructed the same as in all other embodiments. Therefore, the same reference numerals are also used. Furthermore, the rolling elements 48 and the stops 50 of the pressing tool 144 correspond to the rolling elements and stops of the exemplary embodiment according to fig. 5a and 5 b.

In order to release the manual pressing tool 144 from exerting the pressing force F _e The pressing tool 144 has a pressing frame (niederhalterhmen) 152, on which the rolling

bodies

48, 50 are rotatably supported via a shaft 154. The hold-down frame 152 extends from a connecting beam 156 having two legs 158 toward the rib 112. The rib 112 has two grooves 160 transversely, which extend parallel to the recess 14 in the longitudinal direction of the rib 112. The two legs 158 engage in the groove 160 with their curved end sections 162. In this way a hold-down device is formed. The operator of the pressing tool 144 must introduce only the two end sections 162 into the groove 160 at the beginning of the pressing. By means of a particularly manual movement of the pressing-in tool 144 in the direction of the longitudinal extent of the recess 14, via a pressing-in force F _e The first section 18 is pressed in. The penetration depth is limited in that the stop 50 is supported on the comb-shaped surface 164 of the rib 112, where it rolls. According to FIG. 6, due to the large pressing-in force F _e The first portion 18 is pressed in such a way that it completely fills the laterally extended bottom 38 of the recess 14. In other words, a completely flat contact is established between the rib 112 and the first section 18, which improves the contact between the rib 112 and the heat pipe 18 (16, see fig. 1)Thermal transition of (2).

Fig. 7 shows the drive machine 1 according to fig. 1 to 3, which is supplemented with a cooling body 66 configured as a cooling plate. In fig. 7, a hydraulic machine 68 is shown in dashed lines, which can be driven by an electric motor or a drive machine 1. The drive machine 1 together with the hydraulic machine 68 thus forms a drive assembly or a so-called compact unit.

The applicant reserves the right to make patent requests on a drive unit having a drive machine according to the invention and a hydraulic machine fastened at said drive machine.

The cooling plate 66 according to fig. 7 is traversed serpentine by a coolant channel 70.

The first section 18 of the heat pipe 16 absorbs waste heat of the electric motor during operation of the electric motor 1. In the first section 18, the medium located in the heat pipe evaporates. Ideally, this is done at a constant evaporation temperature so that evaporation of the medium is not exceeded. The transfer transition is then isothermal. According to fig. 1, the evaporated medium flows from the first portion 18 into the second portion 24 via a bend in the region of the housing cover 8. Where now heat must again be output. This is done by outputting to a cooling plate 66. In the second section 24, a circulating cooling (Ru ckk Huhlung) of the steam (Dampf) and thus a condensation (Kodensation) of the steam is effected. Here, the outputted condensation heat is absorbed by the coolant flowing through the coolant passage 70.

The cooling plate 66 serves not only to absorb the heat of condensation of the medium in the second section 24, but also to press the second section 24. This pressing step is part of the method according to the invention and is shown in fig. 8 and 9. According to fig. 8, the housing cover 8 is shown with the inserted second section 24 of the heat pipe 16. The second portion 24 is therefore still configured undeformed, in the exemplary embodiment shown in circular cross-section. During the pressing step, the cooling plate 66 now abuts against the housing cover 8. The pressing force is applied by means of a tensioning screw which penetrates the cooling plate 66 and is screwed into the threaded bore 32 according to fig. 3. In the final position, the cooling plate 66 is fastened to the housing cover 8 by means of screws according to fig. 7 and 9, wherein the excess of the second section 24 according to fig. 8 over the surface of the housing cover 8 according to fig. 9 undergoes plastic deformation. As fig. 9 shows, here too, a close, flat abutment of the second section 24 of the heat pipe 16 against the cooling plate 66 is achieved. Since the wall thickness of the cooling plate 66 between the coolant channel 70 and the second section 24 is kept small, the heat flux density is large here and cooling or circulating cooling of the medium in the second section 24, which leads to condensation of the medium, is effective.

Fig. 10 shows an embodiment of the method according to the invention for joining a heat transfer body 6, a heat pipe 16 and, in addition, for joining a drive machine 1 according to fig. 7, i.e. including the fastening of a cooling plate 66 and the pressing of the second section 24 of the heat pipe 16.

In a first step 72, the production of the heat transfer body is carried out by means of a continuous casting method. This is preferably done using aluminum due to the high thermal conductivity of the material. At least the basic form of the heat transfer body 6 according to fig. 1, 2, 3 and 7 is thus produced in one production step. Fig. 2 shows the manufactured heat transfer body 6.

In a further step 74, a bending (not shown) of the second section 24 relative to the first section 18 of the heat pipe 16 is achieved.

In a further step 76, the housing cover 8 is produced with its receiving groove 26 for the second section 24, for example by means of milling. Fig. 3, for example, shows a housing cover 8 produced in this way. Unlike the recess 14 for the first section 18 of the heat pipe 16, the receiving groove 26 is produced without undercuts, i.e. in a U-shape.

In a further step 78, the insertion of the first section 18 into the recess 14 and the insertion of the second section 24 into the receiving groove 26 are effected.

Next, in step 80, for example, using one of the pressing tools 44;144, 144;244;344 to effect the pressing in according to the invention of the first section 18. The opening 34 has a larger opening size than the diameter of the first section 18, so that no plastic deformation of the first section 18 occurs during insertion. In particular, in the case where copper that is hardly elastically deformable is preferably used for the heat pipe 16 due to the conductivity of copper, the opening 34 should be larger than the diameter of the heat pipe 16 that is not pressed so as not to deform the heat pipe 16. The insertion is preferably effected in the above-described manner through the opening 34, i.e. from the radially outer side with respect to the longitudinal axis 2.

Alternatively, the opening 34 can however also be smaller than the diameter of the heat pipe 16, so that the heat pipe 16 can then be moved, for example axially through the mouth of the recess 14, into the end face 22 of the rib 12. In this variant, only the corresponding pressing tool is then introduced and actuated through the opening 34.

As an alternative to the continuous casting method, the recess 14 with the undercut 40 (edge) can be produced, for example, by means of a ball-shaped profile milling tool.

In step 82, the second section 24 is pressed into the housing cover 8 by means of fastening the cooling plate 66 at the housing part, as shown in fig. 7 to 9.

The cooling plate 66 preferably conducts water as a cooling medium, thus achieving a high heat flow density and a small configuration of the heat pipe due to the high enthalpy of evaporation of water.

The use of heat pipes as heat transfer means between the heat transfer body 6 and the cooling body 66 has the advantage that heat transfer to the heat pipes 16 leads to evaporation and heat transfer from the heat pipes 16 to the cooling plate 66 leads to condensation of the medium conducted in the heat pipes 16. In this way, a particularly large heat flow density can be generated, which has a positive effect on the surface area requirement provided for the heat exchange surface. In other words, the installation space requirement is smaller when using the heat pipes 16 compared to conventional convective air cooling. In addition, unlike water cooling, the housing 4 of the drive machine 1 does not need to guide water, which leads to the disadvantages of the sealing problems discussed above and the risk of failure due to leakage. The use of heat pipes is also less costly than this variant.

Fig. 11a and 11b show a variant in which the first portion 18 is pressed into the recess 14 manually. In this case, the recess 14 (and also already shown in the preceding figures) corresponds to the basic form of a key hole, with a radially outwardly directed opening 34 and a base 38 which extends transversely with respect to said opening. In the embodiment according to fig. 11, the handle 46 is fastened to the slide 248 instead of to the rolling bodies. Instead of rolling as described in the exemplary embodiments according to fig. 5a, 5b and 6, the pressing-in force F is now applied by a pressing-in tool 244 sliding at the first section 18 _e And a propulsive force F _v . The sliding body 248 has a cuboid basic form and, at its sides pointing outwards transversely to the sliding direction, has in each case a slidable stop 250 in the form of a flank or shoulder. The stop 250 is placed here on the respective comb-shaped surface 164 of the rib 12. The press-in depth is thus limited by the stop 250. Similar to the rolling bodies 48 according to fig. 5a, 5b and 6, the slider 248 obtains a lateral guidance of the slider via the edge 36 of the opening 34.

The exemplary embodiment according to fig. 11a, 11b, of course, places relatively high force demands on the user, since the user pushes the force F in order to propel the vehicle _v Sliding friction must be overcome and a pressing or pressing force F must also be applied _e 。

In a variant of this, the contact or pressing-in force F is removed for the operator by providing a contact device 252 arranged above the slide 248 _e Application of (1). As a result, the sliding body 248 is pressed in a clamped manner between the holding-down device 252 and the first section 18 in the method step "press-in" 80 against a thrust force F that can be applied by a user _v Is directed. Here too, a stop 250 is again provided, which limits the penetration depth. The guidance of the slide 248 is also carried out here by means of the edge 36 of the opening 34 of the recess 14. The user is facilitated in that he only still has to exert a propulsion force F _v 。

Unlike that shown, a manual pressing tool 44;144, 144;244 or semi-manual pressing tools 344 according to fig. 12 can of course also be operated by machine or automatically.

A method for joining a heat transfer body suitable for a drive machine to at least one heat pipe is disclosed, wherein the heat pipe or a section of the heat pipe is pressed into a recess of the heat transfer body by means of a pressing tool which moves along the heat pipe.

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

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

List of reference numerals:

1. driving machine

2. Longitudinal axis

4. Shell body

6. Heat transfer body

8. 10 casing cover

12; 112. ribs

14. Voids

16. Heat pipe

18. The first section

20. 22 end side surface

24. Second section

26. Accommodating tank

28. Clamping groove

30. Fastening bolt

32. Threaded hole

34. Opening of the container

36. Edge

38. Bottom

40. Edge

42. Foot section

44;144, 144;244; 344. press-in tool

46. Handle (CN)

48. Rolling body

50; 250. stop block

152; 252. pressing frame

66. Cooling body

68. Hydraulic press

70. Coolant channel

72 to 78 method steps

80. Method step of pressing in

82. Method step extrusion

154. Axis of rotation

156. Connecting beam

158. Supporting leg

160. Trough

162. End section

164. Comb-shaped surface

Force F

F _e Force of pressing in

F _v Propulsive force

Claims

1. Method for joining a heat pipe (16) to a heat transfer body (6) which is suitable for cooling a drive machine (1), wherein at least one lamination or rib (12:

-pressing (80) a first section (18) of the heat pipe (16) into the interspace (14) of the lamination or rib by means of a pressing tool (44,

wherein the pressing tool is moved in a guided manner during the pressing in, wherein the guiding is performed by a stop at the heat transfer body, wherein the stop (50) of the pressing tool is supported on a comb-shaped surface (164) of the lamination or rib (12) during the pressing in, wherein a second section (24) of the heat pipe (16) is pressed by or by means of a cooling body (66) of the drive machine (1), wherein the second section (24) extends parallel to a housing section (8) of the drive machine (1) on the housing end side, to which the cooling body (66) is fixed.

2. Method according to claim 1, wherein, upon the pressing-in (80), the pressing-in tool (44.

3. Method according to claim 1 or 2, wherein, upon the pressing (80), the pressing tool (44.

4. Method according to claim 1 or 2, wherein, in the pressing-in (80), the pressing-in tool (44.

5. Method according to claim 1 or 2, wherein, upon the pressing-in (80), the pressing-in tool (44.

6. Method according to claim 1 or 2, wherein, upon the pressing-in (80), the pressing-in tool (144.

7. The method according to claim 1 or 2, wherein, upon the pressing-in (80), the pressing-in tool (44.

8. A heat transfer body for cooling a drive machine (1), which extends in a jacket-like manner and at which at least one lamination or rib (12,

9. The heat transfer body according to claim 8, wherein the interspace (14) has an undercut (40) in the pressing-in direction.

10. The heat transfer body according to claim 9, wherein an opening (34) of the recess (14) extends on the side of the undercut (40), through which opening the heat pipe or heat pipe section (18) can be inserted into the recess (14), and wherein a base (38) of the recess (14) which extends transversely with respect to the opening (14) extends on the side of the undercut (40), into which recess the heat pipe or heat pipe section (18) can be pressed.

11. The heat transfer body according to any of claims 8 to 10, wherein the interspace (14) has a mouth in at least one end side (20, 22) of the lamination or rib (12.

12. The heat transfer body according to any of claims 8 to 10, wherein the first section (18) of the heat pipe (16) is pressed into the interspace (14, 38) by means of a method (80) according to any of claims 1 to 7.

13. The heat transfer body according to claim 12, wherein the first section (18) is pressed in a rolling or rolling and/or sliding manner.

14. The heat transfer body according to any of claims 8 to 10, wherein the interspace (14) is a groove having a minimum width equal to or greater than a cross-sectional diameter of an uncompressed section of the heat pipe (16).

15. The heat transfer body according to claim 10, wherein the pressed-in first section (18) is in flat contact with the bottom (38).

16. Drive machine with a heat transfer body (6) constructed according to one of claims 8 to 15.

17. Drive machine according to claim 16 with a heat transfer body (6) according to claim 13, wherein the second section (24) of the heat pipe (16) is in contact with a cooling body (66) of the drive machine (1).

18. A drive machine according to claim 17, wherein the second section (24) is curved towards the first section (18) and extends parallel to a housing section (8) of the drive machine (1), at which housing section the cooling body (66) is fixed.

19. A drive machine according to claim 18, wherein the second section (24) is pressed between the casing section (8) and the cooling body (66).

20. A drive machine according to claim 16, wherein the drive machine is an electric motor (1).