Sealing structure for cooling liquid flow path in rotating machine

Abstract

The invention provides a sealing structure of a cooling liquid flow path in a rotating machine, which can ensure the sealing performance of the cooling liquid flow path in the rotating machine, maintain the performance of the rotating machine, reduce the size and weight of the rotating machine and improve the cooling performance. A sealing structure for a cooling liquid flow path, which is provided in a thick portion (2a) of a cylindrical frame (2) in a motor (1), is open in at least one axial direction of the frame (2), and in which an annular recess (20), which is an open portion, is sealed with respect to a cooling liquid flow path (10) through which a cooling liquid for cooling the motor (1) flows, the annular recess (20) being an open portion, the cooling liquid flow path (10) being provided in the thick portion (2a) of the cylindrical frame (2) in the motor (1). The bracket (3) is connected with at least one of the two end surfaces of the frame (2) in the axial direction and covers the annular concave part (20) of the cooling liquid flow path (10), and the bracket (3) is provided with a socket embedding convex part (21) which protrudes towards the frame (2) side and is embedded with the annular concave part (20) of the cooling liquid flow path (10).

Description

Technical Field

[0001] The present invention relates to a sealing structure of a cooling liquid flow path through which a cooling liquid for cooling the rotating machine flows, which is applied to various rotating machines such as a motor or a generator for driving an electric vehicle. Background Art

[0002] Conventionally, as a sealing structure for such a coolant flow path, there is known a sealing structure applied to a rotary electric machine as described in Patent Document 1. The rotary electric machine is used as a generator mounted on a vehicle and includes: a housing formed in a substantially cylindrical shape, a stator fixed to the inner peripheral surface of the housing, a rotor rotatably provided inside the stator, a front bracket and a rear bracket respectively arranged on the front side and the rear side in the axial direction of the housing, and a rotating shaft provided so as to rotate integrally with the rotor and protruding forward from the front bracket.

[0003] In the above-mentioned housing, a cooling passage for the flow of coolant for cooling the rotating electrical machine is provided in the thick wall portion thereof. The cooling passage extends in a band shape along the circumference of the housing, and is formed into a ring shape that circles around the thick wall portion of the housing. In addition, in the housing, the front end of the cooling passage in the axial direction is closed, while the rear end of the cooling passage is open to the rear. Moreover, the annular open portion of the rear end portion of the cooling passage (hereinafter referred to as the "annular open portion" in this column) is sealed by a rear bracket and a seal.

[0004] Specifically, seals are arranged on the inner and outer sides of the annular opening in the radial direction of the rear end surface of the housing, and the rear bracket is installed in a state of being in close contact with the two seals on the inner and outer sides and covering the annular opening. As a result, the annular opening at the rear end of the cooling passage is sealed in a watertight state.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2004-364429 Summary of the invention

[0008] Problems to be solved by the invention

[0009] In the sealing structure of the cooling passage of the above-mentioned rotating electrical machine, sealing grooves for accommodating sealing members are formed on the radially inner and outer sides of the annular opening portion on the rear end surface of the housing. These sealing grooves are usually formed at a certain distance in the radial direction from the annular opening portion of the cooling passage. In particular, when the inner diameter of the rear end surface of the housing is the same as the diameter of the inner peripheral surface of the housing to which the stator is fixed, the sealing groove formed at a position inside the annular opening portion is also formed at a certain distance in the radial direction from the inner diameter of the rear end surface of the housing.

[0010] However, when the sealing grooves as described above are formed radially inside and outside the annular opening portion on the rear end surface of the housing, the wall thickness of the housing becomes thicker, and accordingly, the size and weight of the rotating electrical machine become larger. In particular, when the wall thickness of the housing on the radial inside of the cooling passage becomes thicker, the distance between the cooling passage and the stator becomes longer, which may cause a decrease in cooling performance.

[0011] The present invention is made to solve the above-mentioned problems, and its purpose is to provide a sealing structure for the coolant flow path in the rotating machine, which can ensure the sealing of the coolant flow path in the rotating machine and maintain the performance of the rotating machine, and can reduce the size and weight of the rotating machine and improve the cooling performance.

[0012] Means for solving problems

[0013] In order to achieve the above-mentioned purpose, the invention of technical solution 1 is a sealing structure of a coolant flow path, which seals the open part relative to the coolant flow path. The coolant flow path is arranged in the wall thickness part of the cylindrical outer wall in the rotating machine, is open to at least one side of the axial direction of the outer wall and is used for the flow of coolant for cooling the rotating machine. It is characterized in that the sealing structure of the coolant flow path has a cover part, which is joined to at least one of the two end surfaces of the outer wall in the axial direction and covers the open part of the coolant flow path, and the cover part has a socket-engaged protrusion protruding to the outer wall side and engaging with the open part of the coolant flow path.

[0014] According to this structure, a coolant flow path for the flow of coolant for cooling the rotating machine is provided in the wall thickness portion of the cylindrical outer peripheral wall in the rotating machine. In addition, the coolant flow path is open to at least one side of the axial direction of the outer peripheral wall, and the open portion is covered by a cover member engaged with the end face of the axial direction of the outer peripheral wall. In addition, the cover member has a socket-fitting protrusion protruding toward the outer peripheral wall, and the socket-fitting protrusion is engaged with the open portion of the coolant flow path. In this way, since the cover member is engaged with the end face of the outer peripheral wall in a state where the socket-fitting protrusion of the cover member is engaged with the open portion of the coolant flow path, when the engagement is performed, the cover member and the outer peripheral wall can be easily assembled while being centered, and the sealing of the open portion of the coolant flow path can be improved compared to, for example, a case where the open portion of the coolant flow path is covered with a flat surface. Furthermore, the sealing of the open portion of the coolant flow path can be ensured while maintaining the performance of the rotating machine, and the thickness of the thick portion of the outer peripheral wall can be reduced, thereby reducing the size and weight of the rotating machine and improving the cooling performance.

[0015] The invention of Technical Solution 2 is a sealing structure for a coolant flow path in a rotating machine described in Technical Solution 1, characterized in that the open portion of the coolant flow path has an annular recess, the annular recess is formed as an annular shape having a width of a specified length in the radial direction of the outer peripheral wall, the socket-and-spigot engaging protrusion is formed as an annular shape having a width shorter than the specified length in the radial direction of the outer peripheral wall, and the socket-and-spigot engaging protrusion is engaged with the annular recess in a state of being tightly attached to the radial inner peripheral surface of the annular recess.

[0016] According to this structure, the open portion of the coolant flow path has an annular recess having a width of a predetermined length in the radial direction, and on the other hand, the socket-engaging protrusion of the cover member is formed into an annular shape having a width shorter than that of the annular recess having a width of a predetermined length. As a result, the weight of the socket-engaging protrusion can be reduced compared to a case where the socket-engaging protrusion has the same width as the annular recess, and accordingly, the weight of the rotating machine can be reduced. In addition, since the socket-engaging protrusion is engaged with the annular recess in a state of being in close contact with the radial inner peripheral surface of the annular recess, the sealing performance of the radial inner side of the annular recess of the coolant flow path can be improved.

[0017] The invention of Technical Solution 3 is a sealing structure for a coolant flow path in a rotating machine described in Technical Solution 2, characterized in that a liquid sealing gasket is applied to a first specified area on the radial inner side of an annular recess at a joint surface between a cover component and an outer peripheral wall, and the cover component has a first sealing storage groove on the joint surface of the cover component, on the outer side of the first specified area in the radial direction and on the immediately inner side of the socket-engaging protrusion, for preventing the liquid sealing gasket applied to the first specified area from penetrating into the annular recess.

[0018] According to this structure, a liquid seal is applied to the first predetermined area on the radial inner side of the annular recess on the joint surface between the cover component and the outer peripheral wall, so that the seal generated by the socket-fitting convex part can be complemented to further improve the seal of the radial inner side of the annular recess of the coolant flow path. In addition, a first seal accumulation groove is provided on the joint surface of the cover component on the outer side of the first predetermined area in the radial direction, so that when the cover component is joined to the outer peripheral wall, even if the liquid seal applied to the first predetermined area leaks to the annular recess side, it will flow into the first seal accumulation groove, thereby preventing the liquid seal applied to the first predetermined area from entering the annular recess. Thus, the liquid seal applied to the first predetermined area can be reliably prevented from entering the annular recess. In addition, since the first seal accumulation groove is provided on the immediate inner side of the socket-fitting convex part, for example, compared with the case where the first seal accumulation groove is provided at a position away from the socket-fitting convex part, the thickness of the wall thickness portion of the outer peripheral wall on the radial inner side of the coolant flow path can be made thinner. Thereby, good cooling performance in the rotating machine can be ensured.

[0019] The invention of Technical Solution 4 is a sealing structure for a cooling liquid flow path in a rotating machine described in Technical Solution 3, wherein a liquid sealing gasket is applied to a second prescribed area on the radially outer side of an annular recess at a joint surface between a cover component and the outer peripheral wall, and the outer peripheral wall has a second sealing storage groove on the joint surface of the outer peripheral wall, on the radially outer side of the annular recess and on the inner side of the second prescribed area, for preventing the liquid sealing gasket applied to the second prescribed area from penetrating into the annular recess.

[0020] According to this structure, a liquid seal is also applied to the second specified area on the radially outer side of the annular recess on the joint surface between the cover component and the outer peripheral wall, so that the radially outer sealing performance of the annular recess of the coolant flow path can be improved. Therefore, by the cooperation of the liquid seal applied to the first specified area and the liquid seal applied to the second specified area, the radial sealing performance of the annular recess of the coolant flow path can be further improved. In addition, a second sealing storage groove is provided on the joint surface of the outer peripheral wall on the radially outer side of the annular recess and on the inner side of the second specified area, so that when the cover component is joined to the outer peripheral wall, even if the liquid seal applied to the second specified area leaks to the annular recess side, it will flow into the second sealing storage groove, thereby preventing the infiltration into the annular recess. Thus, the liquid seal applied to the second specified area can be reliably prevented from infiltrating the annular recess. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a perspective view showing the appearance of a motor to which a sealing structure for a coolant flow path according to an embodiment of the present invention is applied.

[0022] Figure 2 (a) is a longitudinal sectional view of the motor cut vertically with the motor protruding axially upward, and (b) is an enlarged view of a portion surrounded by a dashed line in (a) (a socket-engaging protrusion of the bracket and its surroundings).

[0023] Figure 3 (a) and (b) are Figure 2 (b) shows the bracket and the frame in a three-dimensional manner in a state where they are separated from each other in the vertical direction.

[0024] Figure 4 It is used to illustrate Figure 3 The bracket is shown in a state where it is engaged with the upper end surface of the frame. DETAILED DESCRIPTION

[0025] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 The appearance of a motor to which a sealing structure for a coolant flow path according to an embodiment of the present invention is applied is shown. The motor 1 (rotating machine) is used, for example, as a drive motor for an electric vehicle.

[0026] like Figure 1 as well as Figure 2 As shown in (a), the motor 1 comprises: a frame 2 (outer peripheral wall) formed in a cylindrical shape; Figure 1 as well as Figure 2 Two brackets 3 and 4 (cover parts) connected at both ends of the motor 1 (in the vertical direction of (a)); a rotor 8 that rotates integrally with a shaft 5 that is rotatably supported by the two brackets 3 and 4 via bearings 3a and 4a; and a stator 9 that faces the rotor 8 with a gap and is fixed to the inner circumference of the frame 2. In the motor 1 shown in the two figures, the shaft 5 protrudes outward (upward) from the bracket 3.

[0027] It should be noted that in the following description, Figure 1 as well as Figure 2 The protruding side of the shaft 5 in (a) is referred to as the upper side, and the opposite side is referred to as the lower side. The brackets 3 and 4 are appropriately referred to as “upper bracket 3” and “lower bracket 4”, respectively.

[0028] The frame 2 is manufactured by aluminum die casting, for example, and is mostly formed into a cylindrical shape having a predetermined inner diameter and outer diameter and a relatively thick wall portion 2a. In addition, an upper flange 6 and a lower flange 7 are provided at the upper end and the lower end of the frame 2 in the axial direction, respectively, and protrude in the radial direction by a predetermined length. The upper flange 6 is provided with a plurality of bolts (in the upper flange 6 and the lower flange 7) for fixing the upper bracket 3. Figure 1 Similarly, the lower flange 7 is also provided with a plurality of mounting holes 6a (only four are shown in the figure) for bolting the lower bracket 4. Figure 1 Only three mounting holes 7a are shown in the figure.

[0029] In addition, a flow path 10 (coolant flow path) is formed in the thick wall portion 2a of the frame 2, through which a predetermined cooling water (coolant) for cooling the motor 1 flows. The flow path 10 has a predetermined depth (a predetermined thickness in the radial direction of the frame 2), extends along the circumferential direction of the frame 2, and is formed in the thick wall portion 2a in a state of being open to the upper and lower sides of the frame 2.

[0030] In addition, if Figure 1 As shown, a cooling water introduction portion 17 for introducing cooling water into the flow path 10 and a cooling water discharge portion 18 for discharging cooling water from the flow path 10 are provided at a predetermined position on the outer peripheral surface of the frame 2 having the flow path 10. Therefore, when cooling the motor 1, the cooling water is introduced into the flow path 10 via the cooling water introduction portion 17, flows in the flow path 10 to cool the stator 9 and the rotor 8, and is discharged to the outside from the cooling water discharge portion 18.

[0031] Next, refer to Figure 2 to Figure 4, the sealing structure of the upper and lower ends of the flow path 10 formed by joining the frame 2 and the upper and lower brackets 3 and 4 is described. In the flow path 10 formed in the wall thickness portion 2a of the frame 2, the entire upper end is open upward, and the entire or a part of the lower end is open downward.

[0032] The upper and lower brackets 3 and 4 are manufactured by aluminum die casting similarly to the frame 2, and are formed into a disc-like planar shape. Figure 2 As shown in (a), a socket-engagement protrusion 21 is provided on the lower surface of the upper bracket 3, which protrudes toward the frame 2 side, that is, downward by a predetermined length and engages with the upper end (open portion) of the flow path 10. Figure 2 As shown in (a), a socket-fitting projection 22 is provided on the upper surface of the lower bracket 4 so as to protrude toward the frame 2 side, that is, upward by a predetermined length and fit into the open portion of the lower end of the flow path 10.

[0033] It should be noted that the sealing structures of the upper and lower ends of the flow path 10 formed by the socket-engaging protrusions 21 and 22 of the upper and lower brackets 3 and 4 are basically the same. Therefore, in the following description, the sealing structure of the upper end of the flow path 10 formed by the connection between the frame 2 and the upper bracket 3 is centered.

[0034] Figure 2 (b) shows an enlarged view of the portion surrounded by the dashed line in (a), specifically, the socket-engaging protrusion 21 of the upper bracket 3 and its surroundings. Figure 3 (a) and (b) are Figure 2 The upper bracket 3 and the frame 2 shown in (b) are three-dimensionally shown in a state where they are separated from each other in the up-down direction.

[0035] like Figure 2 (b) and Figure 3 As shown in (a), the socket-fitting protrusion 21 of the upper bracket 3 protrudes downward by a predetermined length and extends in the radial direction ( Figure 2 The socket-engaging convex portion 21 has a predetermined width in the left-right direction (and the right-left direction) of 3, and the planar shape is formed into a ring shape with a predetermined diameter. It should be noted that in the socket-engaging convex portion 21, the radially inner corner of the lower end portion thereof is chamfered.

[0036] In addition, an inner seal storage groove 23 (first seal storage groove) opened downward is formed on the upper bracket 3 immediately inside the socket-fitting protrusion 21 in the radial direction. The inner seal storage groove 23 has a predetermined width and depth, and is formed in a planar shape in an annular shape concentric with the socket-fitting protrusion 21.

[0037] On the other hand, Figure 2 (b) and Figure 3As shown in (b), an annular recess 20 (open portion) which is open upward and has an annular planar shape is formed at the upper end of the flow path 10 of the frame 2. The radial width of the annular recess 20 is set to be larger than the radial width of the socket-fitting convex portion 21, and the radial inner diameter is set to be the same as the radial inner diameter of the socket-fitting convex portion 21. It should be noted that in the annular recess 20, the radial inner corner of the upper end thereof is chamfered.

[0038] In addition, an outer seal reservoir groove 24 (second seal reservoir groove) opened upward is formed on the upper end surface of the frame 2, outside the annular recess 20 in the radial direction. The outer seal reservoir groove 24 has a predetermined width and depth, similar to the inner seal reservoir groove 23, and is formed in a planar shape that is concentric with the annular recess 20 and larger than the annular recess 20.

[0039] Furthermore, a liquid gasket (not shown) formed into a thin layer by coating is provided on the joint surface between the upper bracket 3 and the frame 2, that is, the lower surface 25 of the upper bracket 3 and the upper end surface 26 of the frame 2.

[0040] Specifically, if Figure 3 As shown in (a), the lower surface 25 of the upper bracket 3 has a surface that is closer to the inside than the inner sealing storage groove 23 in the radial direction (hereinafter referred to as the "inner lower surface 25a") and a surface that is closer to the outside than the socket-engaging protrusion 21 (hereinafter referred to as the "outer lower surface 25b"). When the upper bracket 3 is joined to the frame 2, a liquid sealing gasket is applied to the inner lower surface 25a (first specified area) of the upper bracket 3.

[0041] On the other hand, Figure 3 As shown in (b), the upper end face 26 of the frame 2 has a face that is closer to the inside than the annular recess 20 in the radial direction (hereinafter referred to as the "inner upper end face 26a") and a face that is closer to the outside than the annular recess 20 (hereinafter referred to as the "outer upper end face 26b"). When the upper bracket 3 is joined to the frame 2, a liquid sealing gasket is applied to the outer upper end face 26b of the frame 2, more specifically, to an area (second specified area) on the outer side of the outer sealing storage groove 24 in the outer upper end face 26b.

[0042] It should be noted that the liquid gasket has fluidity at room temperature, dries and solidifies after a certain period of time, and exhibits elasticity and adhesiveness.

[0043] Figure 4 Indicates that the above Figure 3 The upper bracket 3 is in a state of being engaged with the upper end surface 26 of the frame 2. It should be noted that Figure 4 In the figure, for the convenience of illustration, the upper bracket 3 is represented by a double-dotted line.

[0044] like Figure 4As shown, when the upper bracket 3 is joined to the upper end surface 26 of the frame 2, the socket-engaging protrusion 21 of the upper bracket 3 is engaged with the annular recess 20 at the upper end of the flow path 10. More specifically, the socket-engaging protrusion 21 is engaged with the annular recess 20 in a state where its inner peripheral surface 21a is in close contact with the inner peripheral surface 20a of the annular recess 20. It should be noted that, as described above, since the inner corner of the lower end of the socket-engaging protrusion 21 is chamfered, and on the other hand, the inner corner of the upper end of the annular recess 20 is chamfered, when the socket-engaging protrusion 21 is engaged with the annular recess 20, the engagement operation can be easily performed while the two chamfered corners are brought into contact with each other.

[0045] In addition, in the above case, as described above, since the liquid gasket is applied to the inner lower surface 25a of the upper bracket 3 and the outer upper end surface 26b of the frame 2, the inner lower surface 25a of the upper bracket 3 and the inner upper end surface 26a of the frame 2 are in close contact with each other through the liquid gasket, and the outer lower surface 25b of the upper bracket 3 and the outer upper end surface 26b of the frame 2 are in close contact with each other. As a result, the sealing performance of the radial inner side and the radial outer side of the annular recess 20 of the flow path 10 can be further improved.

[0046] In the motor 1 configured as described above, by causing the cooling water to flow through the flow path 10, the stator 9 and the rotor 8 in the motor 1 during operation are cooled, and the heat generation thereof is suppressed. As a result, the good performance of the motor 1 can be maintained.

[0047] As described in detail above, according to the present embodiment, when the socket-engaging protrusion 21 of the upper bracket 3 is engaged with the annular recess 20 at the upper end of the flow path 10, the lower surface 25 of the upper bracket 3 is joined with the upper end surface 26 of the frame 2. Therefore, when performing this joining, the upper bracket 3 and the frame 2 can be easily assembled while being centered, and the sealing of the annular recess 20 in the flow path 10 can be improved compared to the case where the annular recess 20 of the flow path 10 is covered with a flat surface, for example.

[0048] In addition, since the width of the socket-fitting convex portion 21 of the upper bracket 3 is formed to be shorter than the width of the annular recessed portion 20, the weight of the socket-fitting convex portion 21 can be reduced compared to the case where the socket-fitting convex portion 21 has the same width as the annular recessed portion 20, and accordingly, the weight of the motor 1 can be reduced. In addition, since the socket-fitting convex portion 21 is fitted with the annular recessed portion 20 in a state of being closely attached to the radial inner peripheral surface 20a of the annular recessed portion 20, the sealing performance of the radial inner side of the annular recessed portion 20 can be improved.

[0049] Furthermore, the upper bracket 3 is provided with an inner seal reservoir groove 23 immediately inside the socket-fitting convex portion 21, and the frame 2 is provided with an outer seal reservoir groove 24 outside the annular recess 20, so that when the upper bracket 3 and the frame 2 are joined, even if the liquid seal applied to the inner lower surface 25a of the upper bracket 3 and the outer upper end surface 26b of the frame 2 leaks toward the annular recess 20, it will flow into the inner seal reservoir groove 23 or the outer seal reservoir groove 24, thereby preventing the liquid seal from entering the annular recess 20. Thus, the liquid seal can be reliably prevented from entering the annular recess 20.

[0050] Furthermore, since the inner seal storage groove 23 is provided on the inner side of the socket-fitting protrusion 21, the thickness of the wall thickness portion 2a of the frame 2 can be reduced, thereby reducing the size and weight of the motor 1 and improving the cooling performance. It should be noted that in the structure in which the inner seal storage groove 23 is provided on the inner side of the socket-fitting protrusion 21, the socket-fitting protrusion 21 functions as the outer wall of the inner seal storage groove 23, thereby preventing the liquid seal accumulated in the inner seal storage groove 23 from mixing into the flow path 10, so that it can be achieved. Therefore, for example, if the inner seal storage groove 23 is provided on the inner side of the inner peripheral surface of the flow path 10 on the upper bracket 3 without the socket-fitting protrusion 21, the liquid seal flowing into the groove may mix into the flow path 10.

[0051] It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented in various ways. For example, in the embodiment, the width of the socket-fitting protrusion 21 of the upper bracket 3 is made smaller than the width of the annular recess 20 in the flow path 10 of the frame 2, but the present invention is not limited thereto, and the width of the socket-fitting protrusion 21 can also be made the same as the width of the annular recess 20.

[0052] In addition, in the embodiment, the sealing structure of the flow path 10 in the motor 1 as a rotating machine is described, but the present invention can be applied to various rotating machines (such as generators, etc.) that generate heat during operation. In addition, in the embodiment, the motor 1 is cooled by flowing cooling water in the flow path 10 extending along the circumferential direction of the frame 2, but other appropriate cooling liquids (such as cooling oil, etc.) may be used instead of the above cooling water, or as the flow path 10, a flow path having an appropriate structure such as extending while bending along the circumferential direction of the frame 2 may be used.

[0053] In addition, the structures of the details of the motor 1, frame 2, brackets 3 and 4, flow path 10, annular recess 20, socket-fitting protrusions 21 and 22, and inner and outer sealing storage grooves 23 and 24 shown in the embodiment are merely examples and can be appropriately changed within the scope of the main purpose of the present invention.

[0054] Description of Reference Numerals

[0055] 1 Motor (rotating machine)

[0056] 2 Frame (outer wall)

[0057] 2a Thickness of the frame

[0058] 3 Upper bracket (cover part)

[0059] 4 Lower bracket (cover part)

[0060] 5-axis

[0061] 10 flow path (coolant flow path)

[0062] 20 annular recess (opening portion)

[0063] 20a Inner circumferential surface of the annular recess

[0064] 21 Socket-jointed convex portion of upper bracket

[0065] 21a The inner peripheral surface of the socket fitting convex part

[0066] 22 socket-engaging convex portion of lower bracket

[0067] 23 Inner sealing storage groove (first sealing storage groove)

[0068] 24 Outer seal storage groove (second seal storage groove)

[0069] 25 Lower surface of upper bracket

[0070] 25a Inner lower surface (first predetermined area)

[0071] 25b Outer lower surface

[0072] 26 Upper end surface of the frame

[0073] 26a Inner upper end surface

[0074] 26b Outer upper end surface (second predetermined area)

Claims

1. A sealing structure for a coolant flow path in a rotating machine, wherein an open portion is sealed relative to the coolant flow path, wherein the coolant flow path is provided in a thick portion of a cylindrical outer peripheral wall in the rotating machine, is open to at least one side in the axial direction of the outer peripheral wall, and is used to flow coolant for cooling the rotating machine, characterized in that: The sealing structure of the coolant flow path includes a cover member, the cover member is joined to at least one of the two end surfaces in the axial direction of the outer peripheral wall and covers the open portion of the coolant flow path. The cover member includes a socket-fitting projection that protrudes toward the outer peripheral wall and fits with an open portion of the coolant flow path.

2. The sealing structure for the coolant flow path in the rotating machine according to claim 1, wherein: The open portion of the coolant flow path has an annular recessed portion, and the annular recessed portion is formed in an annular shape having a width of a predetermined length in the radial direction of the outer peripheral wall. The socket-fitting projection is formed in an annular shape having a width shorter than the predetermined length in the radial direction of the outer peripheral wall, and the socket-fitting projection is fitted in the annular recessed portion in a state of being in close contact with the radial inner peripheral surface of the annular recessed portion.

3. The sealing structure for the coolant flow path in the rotating machine according to claim 2, wherein: A liquid gasket is applied to a first predetermined region on the radially inner side of the annular recessed portion on the joint surface between the cover member and the outer peripheral wall. The cover component has a first seal storage groove on the joint surface of the cover component, radially outside the first specified area and immediately inside the socket-fitting protrusion, for preventing the liquid seal applied to the first specified area from entering the annular recess.

4. The sealing structure for the coolant flow path in the rotating machine according to claim 3, wherein: A liquid gasket is applied to a second predetermined region on the radially outer side of the annular recessed portion on the joint surface between the cover member and the outer peripheral wall. The outer peripheral wall has a second seal reservoir groove on the joint surface of the outer peripheral wall, radially outside the annular recess and inside the second predetermined area, for preventing the liquid seal applied to the second predetermined area from entering the annular recess.

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