Cooling device and method for manufacturing cooling device

Abstract

In a cooling device 1A, there is formed a hollow part 30 used for a cooling liquid space between a first outer shell part 10 made of a synthetic resin material and a second outer shell part 20 including a metal part 25, the first outer shell part 10 having a first connection part 11, the second outer shell part 20 having a second connection part 21 made of a synthetic resin material, the first connection part 11 and the second connection part 21 being joined.

Description

Cooling device and method for manufacturing cooling device

[0001] The present invention relates to a cooling device that cools an object to be cooled on an outer surface of an outer shell portion that constitutes the outer shell of a hollow portion, in a state where a cooling liquid is disposed in the hollow portion, and a method for manufacturing the same.

[0002] Various cooling devices of this type have been proposed, in which a first outer shell portion made of a low thermal conductivity member for suppressing temperature changes of the cooling liquid is disposed on one side of the hollow portion, and a second outer shell portion made of a high thermal conductivity member for conducting cold temperature to the object to be cooled is disposed on the other side of the hollow portion (see, for example, Patent Document 1).

[0003] In Patent Document 1, as the outer shell portions, an outer shell portion made of a non-metallic material and another outer shell portion made of another non-metallic material having a thermal conductivity different from that of the former outer shell portion are employed.

[0004] Japanese Unexamined Patent Application Publication No. 2023-155543

[0005] Incidentally, cooling devices are also implemented which are formed by separately forming: an outer shell portion made of a low thermal conductivity member formed of a synthetic resin material, and another outer shell portion made of a high thermal conductivity member formed of a metal material such as aluminum or copper, so as to have a hollow portion therein, and then joining these outer shell portions together.

[0006] However, in such a cooling device, it is necessary to join two outer shell portions made of different materials such as a synthetic resin material and a metal material. Joining different materials is prone to dimensional errors, and there is also a risk that an integrally molded product cannot be molded with high strength. Furthermore, there is a problem that it is necessary to manage inventory of both the low thermal conductivity member and the high thermal conductivity member, and the period for manufacturing the cooling device tends to be prolonged.

[0007] It is also conceivable to perform insert molding using a molding machine so as to include a metal material, but it is technically difficult to integrally mold the metal material and the synthetic resin material in a state where the hollow portion is included therein, and this has not been proposed or implemented in the past.

[0008] This invention was proposed in consideration of these circumstances, and its objective is to provide a high-strength, high-dimensional-accuracy cooling device that includes synthetic resin material and metal material as materials. Furthermore, a method for manufacturing such a cooling device, which can be produced using a simple procedure, is also a primary objective of this invention.

[0009] To achieve the above objective, the present invention provides a cooling device comprising a first outer casing made of a synthetic resin material and a second outer casing including a metal part, wherein a hollow portion used as a cooling liquid space is formed between the two, the first outer casing having a first connecting portion and the second outer casing having a second connecting portion made of a synthetic resin material, and the first connecting portion and the second connecting portion are joined together.

[0010] Furthermore, the present invention relates to a method for manufacturing a cooling device, which involves manufacturing a cooling device using a molding machine, wherein the cooling device has a first outer casing made of a synthetic resin material and a second outer casing including a metal part, with a hollow portion formed between them for use as a cooling liquid space, the cooling device being configured to have a joint between the first outer casing and the second outer casing, wherein a molten synthetic resin material is injected into the molding machine to harden and mold the first outer casing including a first connecting portion which serves as a connection portion to the second outer casing, and the second outer casing including a second connecting portion which serves as a connection portion to the first outer casing, which contains a metal material which serves as the material for the metal part, and thereafter, the first connecting portion of the first outer casing and the second connecting portion of the second outer casing are butted together in the molding machine, and a molten synthetic resin material is injected into the joint space between the first connecting portion and the second connecting portion formed by the butt joint to harden and mold the joint, thereby integrating the first outer casing and the second outer casing.

[0011] Since the cooling device of the present invention has the configuration described above, it can achieve high strength and high dimensional accuracy.

[0012] Furthermore, according to the manufacturing method of the cooling device of the present invention, a cooling device with high strength and high dimensional accuracy can be manufactured using a simple procedure.

[0013] This is a schematic longitudinal cross-sectional view of a cooling device according to one embodiment of the present invention. This is a schematic longitudinal cross-sectional view showing the manufacturing method of the cooling device of Figure 1. This is a schematic longitudinal cross-sectional view of a cooling device according to another embodiment of the present invention. This is a schematic longitudinal cross-sectional view of a cooling device according to another embodiment of the present invention.

[0014] Below, several embodiments of the present invention will be described with reference to the accompanying drawings. First, the common basic configuration of the cooling devices 1A, 1B, and 1C according to the several embodiments will be described.

[0015] The cooling devices 1A, 1B, and 1C according to this embodiment are devices in which a hollow portion 2 used as a cooling liquid space is formed between a first outer casing 10 made of a synthetic resin material and a second outer casing 20 including a metal portion 25. The cooling devices 1A, 1B, and 1C are configured such that the first outer casing 10 has a first connecting portion 11, and the second outer casing 20 has a second connecting portion 21 made of a synthetic resin material, and the first connecting portion 11 and the second connecting portion 21 are joined together.

[0016] Next, the detailed configuration of the cooling device 1A according to the first embodiment will be described with reference to Figure 1. In the following, the vertical direction of the cooling device 1A will be based on the top and bottom of the vertical cross-sectional view shown in Figure 1. The same applies to the second and third embodiments.

[0017] The cooling device 1A has a rectangular parallelepiped shape enclosed by a six-sided outer shell, and inside it is a rectangular parallelepiped hollow section enclosed by the six-sided outer shell. Two of the six opposing faces have inlets 3 formed on them for the coolant to flow in and out. The coolant flows into and out of the cooling device 1A from the inlets 3 through the hollow section 2. In addition, one face adjacent to the face with the two inlets 3 is a cooling surface (bottom 26 in the example of Figure 1) for cooling the object to be cooled 7.

[0018] The outer casing of the cooling device 1A mainly comprises a first outer casing portion 10, whose cross-sectional cut surface is U-shaped, and a second outer casing portion 20, which is also U-shaped. The outer casing further includes a joint portion 30, which is the joint between the first outer casing portion 10 and the second outer casing portion 20. This joint portion 30 is provided around the entire circumference.

[0019] The first outer casing 10 has a ceiling portion 15 and a first connecting portion 11 provided at the side end 12, both of which are made of synthetic resin. The second outer casing 20 has a metal portion 25 (metal plate) which is a high thermal conductivity member for forming the bottom portion 26, and a second connecting portion 21 made of synthetic resin provided at the side end 22. The joint portion 30 is also made of synthetic resin.

[0020] For example, aluminum or copper may be used as the metal material 46 that constitutes the metal part 25. Furthermore, the synthetic resin material is a low thermal conductivity member with a lower thermal conductivity than the metal part 25. In other words, the first outer casing 10 and the second connecting part 21 have lower thermal conductivity than the metal part 25. Thus, the metal material 46 is arranged only on the bottom part 26 that constitutes the cooling surface of the cooling device 1A, with the upper surface of the metal part 25 facing the hollow part 2 and the lower surface exposed.

[0021] In this embodiment, the synthetic resin material constituting the first outer casing 10, the synthetic resin material constituting a part of the second outer casing 20, and the synthetic resin material constituting the joint 30 are all made of the same type of material. It is desirable to use a reinforcing fiber-containing resin material for these synthetic resin materials to enhance strength, rigidity, heat resistance, and impact resistance.

[0022] For example, a thermoplastic resin such as PPS (polyphenylene sulfide) containing glass fibers is particularly desirable. Alternatively, a thermoplastic resin such as PP (polypropylene) containing glass fibers may be used. In addition to glass fibers, various other reinforcing fibers such as carbon fibers and aramid fibers can be used.

[0023] Furthermore, the synthetic resin material constituting the first outer casing 10, the synthetic resin material constituting a part of the second outer casing 20, and the synthetic resin material constituting the joint 30 may be of different types. In addition, the synthetic resin material constituting the joint 30 may be a synthetic resin material that does not contain reinforcing fibers.

[0024] The first outer section 10 and the second outer section 20 each have a pan shape with four upright walls 13 and 23 on their perimeter, and internal spaces 14 and 24 surrounded by them. In short, the first connecting section 11 consists of four upright walls 13, and the second connecting section 21 consists of four upright walls 23.

[0025] The tip surfaces of the upright wall portions 13 on all four sides of the downward-facing first outer casing portion 10 and the upright wall portions 23 on all four sides of the upward-facing second outer casing portion 20 are brought together, and the two internal spaces 14 and 24 are joined to form the hollow portion 2.

[0026] Furthermore, a recess 11a is formed on the outer circumference of the first connecting portion 11 (the four upright wall portions 13), and a recess 21a is formed on the outer circumference of the second connecting portion 21 (the four upright wall portions 23). The recess 11a is formed in an annular shape so as to encircle the outer circumference of the first connecting portion 11. Similarly, the recess 21a is formed in an annular shape so as to encircle the outer circumference of the second connecting portion 21. The recesses 11a and 21a are provided so that their widths in the wall thickness direction are the same.

[0027] In other words, the tip surfaces of the upright wall portions 13 and 23 are shaped with a step in the wall thickness direction. When the first outer casing portion 10 and the second outer casing portion 20 are butted together, a joining space 31 is formed by the recesses 11a and 21a, and a joint portion 30 is provided in this joining space 31. Therefore, the joint portion 30 is provided so as to straddle the abutting portion between the tip surface of the upright wall portion 13 of the first outer casing portion 10 and the tip surface of the upright wall portion 23 of the second outer casing portion 20 (so as to overlap with the abutting portion in the wall thickness direction). The wall thickness direction is the direction perpendicular to the upright wall portion 13 or upright wall portion 23 that separates the hollow portion 2 from the outside of the cooling device 1A, and the same meaning will be used hereafter.

[0028] Furthermore, the recesses 11a and 21a may be provided only on one of the upper and lower parts (first connecting part 11, second connecting part 21), and the joint space 31 may be formed by the recesses 11a and 21a on that one part. Also, the joint space 31 may be formed by providing grooves in the middle of the wall thickness direction on at least one of the upper and lower end faces of the upright wall parts 13 and 23, and by combining these grooves or grooves together. Moreover, for example, the joint space 31 may be in the form shown in Figures 3 and 4, which will be described later.

[0029] Thus, since the cooling device 1A has only one cooling surface formed by the metal part 25, and the other surfaces are made of synthetic resin material, heat dissipation to the external air layer is minimized, and only the object to be cooled 7 can be efficiently cooled. Furthermore, because the metal part 25 is arranged on only one surface of the rectangular parallelepiped, material costs can be reduced and the weight of the cooling device 1A can be reduced.

[0030] Furthermore, such a cooling device 1A can be easily manufactured using the manufacturing method shown in Figure 2. Figure 2 is a schematic diagram of an injection molding method using a molding machine 400 called DSI (die slide injection). The DSI method allows for the rapid and accurate molding of hollow bodies. The following explanation will be based on Figure 2. First, the configuration and basic procedure of the molding machine 400 will be described.

[0031] The molding machine 400 comprises a molding die 40 consisting of a first die 41 and a second die 42, and a sliding mechanism 43 connected to the second die 42. The sliding mechanism 43 may be, for example, a hydraulic cylinder type.

[0032] The first mold 41 and the second mold 42 are provided with cavities 41a and 42a and cores 41b and 42b, respectively. The first molded section 44A is formed by the facing of the cavity 41a of the first mold 41 and the core 42b of the second mold 42, and the second molded section 44B is formed by the facing of the core 41b of the first mold 41 and the cavity 42a of the second mold 42. The first molded section 44A is a component for molding the first outer casing 10 of the cooling device 1A, and the second molded section 44B is a component for molding the second outer casing 20 of the cooling device 1A.

[0033] The second mold 42 is a movable type that slides when driven by a slide mechanism 43. By driving this slide mechanism 43, it is possible to move between two states: a state in which the first molded section 44A and the second molded section 44B are formed (see procedure A) and a state in which the cavities 41a and 42a face each other (see procedures B and C). Thus, the first molded section 44A and the second molded section 44B are molded sections that are variably formed when driven by the slide mechanism 43.

[0034] Furthermore, the core 41b of the first type 41 and the core 42b of the second type 42 each have steps 41ba and 42ba formed to create a bonding space 31, which will be described later in Figure 2(b). Also in Figure 2, 40a is a nozzle for injecting the synthetic resin molten material 45 into the mold 40, and 40b is an injection passage for sending the injected synthetic resin molten material 45 into both cavities 41a and 42a.

[0035] First, the mold 40 is prepared to form a first molding section 44A and a second molding section 44B. A synthetic resin molten material 45 is then injected into the mold 40 to simultaneously and individually mold the first outer casing section 10, which includes a first connecting section 11 that serves as a connection section to the second outer casing section 20, and the second outer casing section 20, which includes a second connecting section 21 that serves as a connection section to the first outer casing section 10 and contains a metal material 46 that serves as the material for the metal section 25 (this is the primary molding process in the DSI method).

[0036] Then, the sliding mechanism 43 is driven to bring the mold 40 into a state where the first connecting portion 11 of the first outer casing 10 and the second connecting portion 21 of the second outer casing 20 are butted together. Then, the synthetic resin molten material 45 is injected into the joining space 31 between the first connecting portion 11 and the second connecting portion 21 to form the joining portion 30 and integrate the first outer casing 10 and the second outer casing 20 (the above is secondary molding in the DSI method). This will be explained in more detail.

[0037] First, a metal material 46, which will be used as the material for the metal part 25 for insert molding, is placed in the cavity 42a of the second mold 42, and a synthetic resin molten material 45 is injected into the injection channel, which is then branched and sent to the first molding section 44A and the second molding section 44B, respectively.

[0038] Then, in the first molding section 44A, the first outer casing 10 is formed by mold clamping, and in the second molding section 44B, the second outer casing 20, including the metal part 25, is formed by mold clamping. These individual molding processes constitute the primary molding (see procedure A in Figure 2). At this time, recesses 11a and 21a (see Figure 1) are formed on the outer circumferences of the first outer casing 10 and the second outer casing 20, respectively, by the steps 41ba and 42ba of the cores 41b and 42b.

[0039] Thereafter, the slide mechanism 43 is driven to cause the cavities 41a and 42a of the first mold 41 and the second mold 42 to face each other. That is, the distal end surface of the first connection portion 11 (the four-sided rising wall portion 13) of the first outer shell portion 10 formed in the cavity 41a of the first mold 41 is butted against the distal end surface of the second connection portion 21 (the four-sided rising wall portion 23) of the second outer shell portion 20 formed in the cavity 42a of the second mold 42 (see step B in FIG. 2).

[0040] At this time, on the outer peripheral side between the first connection portion 11 and the second connection portion 21, the spaces formed by the recesses 11a and 21a are connected to each other to form a joining space 31.

[0041] Next, a molten synthetic resin material 45 is injected into the joining space 31, spread over the entire circumference, and the joint portion 30 is molded by clamping, so that the first outer shell portion 10 and the second outer shell portion 20 are integrated. The above integral molding is referred to as secondary molding (see step C in FIG. 2).

[0042] Through the above steps A, B and C, the cooling device 1A with the metal portion 25 having the hollow portion 2 inside is formed. In the example shown in FIG. 2, the outflow / inflow port 3 is formed by molding with the first molding portion 44A, but it may also be opened after the secondary molding.

[0043] According to the manufacturing method using such a DSI process, primary molding and secondary molding can be continuously performed in the same molding machine 400 (molding die 40), so that the first outer shell portion 10 and the second outer shell portion 20 can be combined with each other without demolding each of them, enabling efficient production. As a result, the manufacturing cycle can be shortened.

[0044] Furthermore, since it is a continuous molding method, welding defects caused by shrinkage after molding are less likely to occur even in molding involving two different materials. Therefore, the cooling device 1A with high strength, small dimensional error and high dimensional accuracy can be manufactured. In addition, according to the DSI process, the generation of intermediate inventory of the first outer shell portion 10 and the second outer shell portion 20 can be suppressed.

[0045] Next, a detailed configuration of the cooling device 1B according to the second embodiment will be described with reference to FIG. 3. FIG. 3 is a schematic vertical cross-sectional view and an enlarged cross-sectional view of a joined portion. For convenience of explanation, the enlarged cross-sectional view illustrates a state where the joined portion 30 is not formed. Since the overall shape of the cooling device 1B including the hollow portion 2 and the first outer shell portion 10 are generally the same as those of the first embodiment, the same reference numerals are assigned and the description thereof is omitted. Each material of the synthetic resin material and the metal material 46 is also the same as that of the first embodiment.

[0046] The second outer shell portion 20 has a U-shaped overall shape, and is the same as that of the first embodiment in that it includes a metal portion 25 and a second connecting portion 21 made of a synthetic resin material, but differs from that of the first embodiment in that a bottom portion 26 constituting a cooling surface is formed of the metal portion 25 and a part of the second connecting portion 21.

[0047] Specifically, as shown in the cross-sectional view of FIG. 3, the second connecting portion 21 has a substantially inverted L-shape, and is disposed so as to fit against the outer corner of the metal portion 25 on the hollow portion 2 side and sandwich the metal portion 25 from four peripheries. That is, the second connecting portion 21 is configured to be in contact with the surface of the metal portion 25 on the hollow portion 2 side and the outer peripheral surface of the metal portion 25. With such a configuration, the planar dimension of the metal portion 25 is smaller than the planar dimension of the bottom portion 26 and larger than the planar dimension of the hollow portion 2.

[0048] Since the second outer shell portion 20 has such a configuration, the volume of the metal portion 25 can be made smaller than that of the first embodiment, and the material cost of the metal material 46 can be reduced. In addition, the metal portion 25 and the second connecting portion 21 are connected such that the outer corner portion (the outer corner and both adjacent surfaces) of the metal portion 25 on the inner space 24 side engages with the inner corner portion (the inner corner and both adjacent surfaces) of a stepped portion 21f facing outward of the second connecting portion 21, so that the connection strength between both members can be increased. Other effects are the same as those of the cooling device 1A according to the first embodiment.

[0049] In addition, the same DSI method as in FIG. 2 is used for the manufacturing method of the cooling device 1B. Although the shape of the molding die 40 is different from that in FIG. 2, the manufacturing procedure is generally the same, so the description of the detailed procedure and effects is omitted.

[0050] Furthermore, the joint portion 30 differs from that in Figure 1, as shown in Figure 3, and will be explained below. First, the shape of the tip surface of the first connecting portion 11 of the first outer casing portion 10 and the tip surface of the second connecting portion 21 of the second outer casing portion 20 are different from those in Figure 1.

[0051] Specifically, the tip surface of the first connecting portion 11 has a stepped shape with a recessed ridge 11b on the inner side and a protruding ridge 11c on the outer side, while the tip surface of the second connecting portion 21 has a stepped shape with a protruding ridge 21b on the inner side and a recessed ridge 21c on the outer side, and these stepped shapes create an engagement relationship between them.

[0052] Furthermore, grooves 11d and 21d are formed on the surface of the outer protrusion 11c of the first connecting portion 11 and the surface of the outer recess 21c of the second connecting portion 21, facing each other approximately in the center in the wall thickness direction. A joining space 31 is formed by the merging of the spaces of these grooves 11d and 21d, and a joint portion 30 made of synthetic resin material is provided in this joining space 31.

[0053] Thus, the cooling device 1B differs from that shown in Figure 1 in terms of the shape of the joint 30 and its vicinity. The cooling device 1B is more robustly constructed through the engagement of the joint 30 with the stepped shapes of the end faces of the first connecting portion 11 and the second connecting portion 21.

[0054] Furthermore, because the tip surfaces of the first connection portion 11 and the second connection portion 21 are stepped, leakage of the molten synthetic resin material 45 from the joint space 31 into the hollow portion 2 during secondary molding in the DSI method can be firmly suppressed.

[0055] Although the second outer casing 20 has a more complex structure than that of the first embodiment, if a mold 40 that matches the shape of the metal part 25 and the second connecting part 21 is prepared, there is almost no risk that the manufacturing method of this cooling device will be more complicated than that of the first embodiment (see Figure 2).

[0056] Next, the detailed configuration of the cooling device 1C according to the third embodiment will be described with reference to Figure 4. Figure 4 is a schematic longitudinal cross-sectional view and an enlarged cross-sectional view of the joint portion. For the sake of explanation, the enlarged cross-sectional view shows the state in which the joint portion 30 has not yet been formed. The first outer casing portion 10 is the same as that of the first embodiment, so it is given the same reference numerals and its description is omitted. The materials of the synthetic resin material and the metal material 46 are also the same as those of the first embodiment.

[0057] In this embodiment, the hollow portion 2 is composed solely of the internal space 14 of the first outer portion 10. In other words, the second outer portion 20 is not U-shaped but rather substantially flat, and is positioned to block the internal space 14 of the first outer portion 10 from below.

[0058] The second outer casing 20 has second connecting portions 21 arranged around the metal portion 25, and in the example shown in Figure 4, the planar dimensions of the metal portion 25 are the same as the planar dimensions of the hollow portion 2.

[0059] Because the second outer casing 20 has this configuration, the volume of the metal part 25 can be made even smaller than that of the second embodiment, and the material cost of the metal part 25 can be further reduced. Also, because the second outer casing 20 is flat, the overall shape of the cooling device 1C, especially the vertical dimension, can be made smaller. Other effects are the same as those of the cooling device 1A of the first embodiment.

[0060] Furthermore, the same DSI method as shown in Figure 2 is used for the manufacturing of the cooling device 1C. Although the shape of the mold 40 differs from that of Figure 2, the manufacturing procedure is generally the same, so a detailed explanation of the procedure and effects will be omitted.

[0061] In this embodiment, the first outer casing 10 is U-shaped and the second outer casing 20 is flat, but the first outer casing 10 may be flat and the second outer casing 20 may be U-shaped. In that case, the cooling device is configured such that the second outer casing 20 has a shape substantially the same as the second outer casing 20 shown in Figure 3, and the plate-shaped first outer casing 10 is arranged on its upper surface. In this case, the first connecting portion 11 is the outer periphery of the ceiling portion 15.

[0062] Furthermore, the joint portion 30 differs from that in Figure 1, as shown in Figure 4, and will be explained below. First, the shape of the tip surface of the first connecting portion 11 of the first outer casing portion 10 and the tip surface of the second connecting portion 21 of the second outer casing portion 20 are different from those in Figure 1.

[0063] Specifically, the tip surface of the first connecting portion 11 has an uneven shape with convex ridges 11c, concave ridges 11b, and convex ridges 11c formed sequentially from the inside to the outside, while the tip surface of the second connecting portion 21 has an uneven shape with concave ridges 21c, convex ridges 21b, and concave ridges 21c formed sequentially from the inside to the outside, and these uneven shapes create an interlocking relationship between them.

[0064] Furthermore, a recess 21e is formed on the outer side of the surface of the outer groove 21c of the second connecting portion 21, and a joining space 31 is formed surrounded by the flat surface of the outer protrusion 11c of the first connecting portion 11 and the recess 21e of the second connecting portion 22, and a joining portion 30 made of synthetic resin material is provided in this joining space 31.

[0065] Thus, the cooling device 1B differs in its configuration from those shown in Figures 1 and 3 regarding the joint 30 and its vicinity. The cooling device 1B is more robustly constructed through the engagement of the joint 30 and the stepped shapes of the end faces of the first connecting portion 11 and the second connecting portion 21.

[0066] Furthermore, because the upright wall portions 13 and 23 have an uneven shape, leakage of the molten synthetic resin material 45 from the joint space 31 into the hollow portion 2 during secondary molding in the DSI method can be more effectively suppressed.

[0067] It goes without saying that the joining configuration between the end faces of the upright wall sections 13 and 23, including the joint 30, when using the DSI method is not limited to the three types shown in Figures 1, 3, and 4, but various other joining configurations are also permitted.

[0068] Furthermore, the manufacturing method of the cooling device does not have to be the DSI method. The first outer casing 10 and the second outer casing 20 may be manufactured individually, demolded, and then the flat end surfaces of the first connecting part 11 and the second connecting part 21 may be joined together with an adhesive or other synthetic resin material. In addition, the end surfaces may be joined together by welding using a hot plate, vibration, ultrasound, laser, etc. Mechanical fastening may also be used.

[0069] Thus, in a case where the joining of the first connecting portion 11 and the second connecting portion 21 is not achieved by filling the joining space 31 with synthetic resin material through the merging of recesses 11a and 21a, but by joining flat end faces together, the synthetic resin material (or adhesive portion, welded portion) arranged in a thin film between the end faces corresponds to the joining portion 30.

[0070] The various cooling devices 1A, 1B, and 1C described above are merely examples. Furthermore, it goes without saying that the overall shape of cooling devices 1A, 1B, and 1C can be appropriately modified to shapes other than those shown in the illustrations, as a design consideration.

[0071] 1A, 1B, 1C Cooling device 2 Hollow section 3 Outlet / Inlet 7 Cooling target 10 First outer section 11 First connection section 11a Recess 11b Recessed section 11c Recessed section 11d Groove 12 Side end 13 Upright wall section 14 Internal space 15 Ceiling section 20 Second outer section 21 Second connection section 21a Recess 21b Recessed section 21c Recessed section 21d Groove 21e Recess 21f Step section 22 Side end 23 Upright wall section 24 Internal space 25 Metal section 26 Bottom section 30 Joint section 31 Joint space 400 Molding machine 40 Molding die 40a Nozzle 40b Injection path 41 First die 41a Cavity 41b Core 41ba Step 42 Type 2 42a Cavity 42b Core 42ba Step 43 Slide mechanism 44A First molding section 44B Second molding section 45 Synthetic resin molten material 46 Metal material

Claims

1. A cooling device having a hollow portion for use as a cooling liquid space formed between a first outer casing made of a synthetic resin material and a second outer casing including a metal part, wherein the first outer casing has a first connecting portion, the second outer casing has a second connecting portion made of a synthetic resin material, and the first connecting portion and the second connecting portion are joined together.

2. The cooling device according to claim 1, characterized in that one of the first outer casing and the second outer casing has upright wall portions at both ends in a cross-sectional view, and the hollow portion is formed by joining the first outer casing and the second outer casing such that the internal space formed by the upright wall portion is closed by the other outer casing.

3. The cooling device according to claim 1, wherein both the first outer casing and the second outer casing have upright wall portions at both ends in cross-sectional view, and the hollow portion is formed by the tip surfaces of the upright wall portions of the first outer casing and the upright wall portions of the second outer casing being butted together and joined.

4. The cooling device according to claim 1, characterized in that a joining space is provided between the first connecting portion and the second connecting portion, and a joining portion made of a synthetic resin material is formed in the joining space, which joins the first connecting portion and the second connecting portion.

5. A method for manufacturing a cooling device using a molding machine, wherein the cooling device has a first outer casing made of a synthetic resin material and a second outer casing including a metal part, between which a hollow portion used as a cooling liquid space is formed, the cooling device having a joint between the first outer casing and the second outer casing, wherein a molten synthetic resin material is injected into the molding machine to harden and mold the first outer casing including a first connecting portion which serves as a connection portion to the second outer casing, and the second outer casing including a second connecting portion which serves as a connection portion to the first outer casing, which contains a metal material which serves as the material for the metal part, and thereafter, the first connecting portion of the first outer casing and the second connecting portion of the second outer casing are butted together in the molding machine, a molten synthetic resin material is injected into the joint space between the first connecting portion and the second connecting portion formed by the butt joint, and the joint is hardened and molded to integrate the first outer casing and the second outer casing.

6. The method for manufacturing a cooling device according to claim 5, characterized in that both the first outer casing and the second outer casing have upright wall portions at both ends, and the joining space is formed by the butting of the upright wall portion of the first outer casing and the upright wall portion of the second outer casing.

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