Rotating electric machines

Abstract

The present invention provides a sealing component that provides high sealing performance in a coolant flow path. A rotating electric machine includes: a stator core on which a winding is wound; a stator frame that supports the stator core; a housing that is disposed outside the stator frame and forms a flow path space between the housing and the stator frame; and a sealing component that is disposed between the stator frame and the housing, and the housing has an assembly portion on which the sealing component is assembled, the sealing component has a base portion that contacts the housing and the stator frame; and a mounting portion that protrudes from the base portion and is inserted into the assembly portion of the housing.

Description

Technical Field

[0001] The invention relates to a rotating electric machine. Background Art

[0002] Devices used in automobiles are required to be smaller and have higher outputs. In rotating electrical machines, coolants are used to cool the stator conductors in order to cool the heat generated by the increase in the amount of current.

[0003] As background technology in this technical field, there is the following prior art. Patent document 1 (Japanese Patent Laid-Open No. 2009-247085) describes a rotating electric machine, which has a stator and a rotor rotatably held inside the stator with a predetermined gap therebetween, a coolant passage located on the outer periphery of the stator, formed into a band shape in the circumferential direction by a bracket, and the coolant passage having a boundary wall, a coolant inlet provided on one side across the boundary wall, and a coolant outlet provided on the other side, and the boundary wall is formed in such a manner that the distance between the boundary wall and the coolant outlet is smaller than the distance between the boundary wall and the coolant inlet (see abstract).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2009-247085 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] However, in the rotating electrical machine described in Patent Document 1, since the boundary wall is integrally formed with the center bracket by casting such as die casting, there is a problem of low sealing performance in the coolant flow path formed between the center bracket and the rear bracket.

[0009] Therefore, the present invention seeks to provide a boundary wall (sealing member) that provides sealing in a coolant flow path.

[0010] Technical means of solving problems

[0011] A representative example of the invention disclosed in the present application is as follows: that is, a rotating electric machine, comprising: a stator core wound with a winding; a stator frame supporting the stator core; a housing disposed outside the stator frame and forming a flow path space with the stator frame; and a sealing member disposed between the stator frame and the housing, wherein the housing has a recessed portion in which the sealing member is mounted, and the sealing member has: a base portion in contact with the housing and the stator frame; and a convex portion protruding from the base portion and inserted into the recessed portion of the housing.

[0012] Effects of the Invention

[0013] According to the present invention, a sealing member having high sealing performance in a cooling liquid flow path can be provided. Other problems, configurations, and effects than those described above will become clear from the following description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view of a rotating electrical machine according to an embodiment of the present invention.

[0015] Figure 2 It is an exploded perspective view showing the overall structure of the rotating electrical machine.

[0016] Figure 3 This is a front view of the rotating electrical machine with the casing removed.

[0017] Figure 4 yes Figure 3 An enlarged view of part A.

[0018] Figure 5 It is a figure which shows the shape of the sealing member of Example 1.

[0019] Figure 6 It is a front view showing the shape of the sealing member before insertion.

[0020] Figure 7 It is a front view showing the shape of the assembled sealing member.

[0021] Figure 8 It is a figure which shows the shape of the sealing member of Example 2.

[0022] Fig. 9 It is a figure which shows the shape of the sealing member of Example 3.

[0023] Fig.10 It is a figure which shows the shape of the sealing member of Example 4. DETAILED DESCRIPTION

[0024] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0025] Figure 1 is a perspective view of a rotating electrical machine 100 according to an embodiment of the present invention. Figure 2 is an exploded perspective view showing the overall structure of the rotating electrical machine 100. Figure 3 is a front view of the rotating electrical machine 100 with the housing 11 and the rotor 4 removed. Figure 4 yes Figure 3 An enlarged view of part A.

[0026] The rotary electric machine 100 includes a front housing 12 of a device type with one end opened in the axial direction and a rear housing 11 that blocks the opening. A coolant inlet 111 and a coolant outlet 112 are provided at a distance from each other in the axial rear portion of the front housing 12. The front housing 12 and the rear housing 11 are fixed by a plurality of bolts. A coolant flow path 15 is formed in a band shape in the circumferential direction of the rotary electric machine 100 between the stator 3 (the stator frame 34 at the outermost periphery) and the front housing 12.

[0027] like Figure 2 , Figure 3 As shown, the front housing 12 and the stator frame 34 are cylindrical. The stator frame 34 is assembled to the front housing 12 from the axial direction by means of water leakage prevention components such as an O-ring 16 and a sealing member 131, thereby forming a coolant flow path 15. The front housing 12 has a recess 123 for assembling the sealing member 131, and the sealing member 131 is fixed in a manner such that the coolant flow path 15 is located between the coolant inlet 111 and the coolant outlet 112.

[0028] like Figure 3 , Figure 4 As shown, the coolant flow path 15 is provided between the front housing 12 and the stator frame 34, is isolated from the outside by the O-ring 16, and is separated from the inlet side and the outlet side by the sealing member 131. The sealing member 131 is formed of an elastic material (such as EPDM) so as to be easily deformed, and is compressed and arranged between the front housing 12 and the stator frame 34.

[0029] The stator 3 is mounted inside the front housing 12. The rotor 4 is rotatably held inside the stator 3.

[0030] The stator 3 is formed by winding stator coils on a plurality of teeth provided on a stator core formed by stacking electromagnetic steel plates, separated by coil frames, and a stator frame 34 is installed on the outside of the stator core. When the rotating electric machine 100 operates and current flows through the stator coils, the stator coils generate heat due to copper loss. Since the stator coils are densely packed in the stator 3, heat due to copper loss accumulates and the temperature tends to rise. Therefore, the stator 3 is cooled by the coolant flowing in the coolant flow path 15 provided on the outer periphery of the stator frame 34.

[0031] The rotor 4 has a plurality of magnets inserted into a plurality of slots provided on a rotor core formed by stacking electromagnetic steel sheets. The rotor core is fastened to the shaft by shrink fit or press fit (not shown). The shaft is rotatably supported by bearings provided on the rear housing 11 and the front housing 12, and power is output from a portion protruding from the front housing 12.

[0032] The rotating electric machine 100 of such a configuration is installed in the engine room of a vehicle (not shown), for example, and transmits driving force via a belt or gears. In addition, it is connected to a control device such as an inverter via a three-phase power cable to control its operation (driving, power generation).

[0033] Hereinafter, the shape of the sealing member 131 in each embodiment will be described in detail.

[0034] <Example 1> Figure 5 1 is a diagram showing the shape of the sealing member 131 of Example 1. Figure 6 is a front view showing the shape of the sealing member 131 before assembly, Figure 7 It is a front view showing the shape of the sealing member 131 installed between the front housing 12 and the stator frame 34 .

[0035] The sealing member 131 of the first embodiment includes a convex portion 132 inserted into the concave portion 123 of the front housing 12 , a base portion 133 in contact with the outer side surface of the stator frame 34 , and a space forming portion 134 on the lower surface of the base portion 133 (the surface opposite to the convex portion 132 ).

[0036] The base portion 133 has a base first portion 133A disposed on the left side of the protrusion 132 and a base second portion 133B disposed on the right side, and is formed into a shape that expands to the left and right. The base first portion 133A and the base second portion 133B have a protrusion 133C protruding from the base portion 133 to the stator frame 34 side. The height of the protrusion 133C is relatively small relative to the height of the base portion 133, and is about 1 / 10 in this embodiment. In addition, the base portion 133 has a space forming portion 134 composed of the protrusion 133C, the base first portion 133A and the base second portion 133B. The space forming portion 134 has a first space portion 135A that forms a space between the stator frame 34 and the sealing member 131 along the stator frame 34 and a second space portion 135B that forms a space protruding in the direction of the protrusion 132 in the central portion of the sealing member 131.

[0037] like Figure 7 As shown, when the stator frame 34 is installed in the front housing 12, the protrusion 133C of the sealing member 131 contacts the stator frame 34 and is compressed by the front housing 12 and the stator frame 34. A part of the volume of the protrusion 133C compressed by the stator frame 34 compresses the first base portion 133A and the second base portion 133B, and a part of the volume of the space forming portion 134 is pushed out to the side of the stator frame 34. The pushed out space forming portion 134 contacts the stator frame 34.

[0038] In this structure, since the area of ​​the seal member 131 compressed by the stator frame 34 is a part of the seal member 131 facing the stator frame 34, the load of compressing the seal member 131 can be suppressed, and the area of ​​the seal member 131 in contact with the stator frame 34 becomes substantially the entire surface of the seal member 131 facing the stator frame 34, and the sealing performance between the stator frame 34 and the seal member 131 can be ensured. Therefore, the sealing performance that separates the flow path from the coolant inlet 111 and the flow path to the coolant outlet 112 is ensured, and the friction force when the stator frame 34 is installed in the front housing 12 from the axial direction while compressing the seal member 131 is small, so the assembly workability is good.

[0039] The front housing 12 and the stator frame 34 have manufacturing tolerances. Therefore, the compression amount of the sealing member 131 varies depending on the combination of the front housing 12 and the stator frame 34. In the case of a large compression amount, not only the protrusion 133C but also the space forming portion 134 is compressed. When the space forming portion 134 is compressed, a portion of the volume of the space forming portion 134 expands in the direction of the second space portion 135B, and the spatial volume of the second space portion 135B becomes smaller. Therefore, since the reaction force caused by the compression of the space forming portion 134 of the sealing member 131 between the front housing 12 and the stator frame 34 is alleviated, it is possible to ensure the contact area of ​​the sealing member 131 and the stator frame 34 related to the sealing between the flow path from the coolant inlet 111 and the flow path to the coolant outlet 112, and reduce the friction when the stator frame 34 is installed on the front housing 12.

[0040] In this embodiment, not only the friction force when the stator frame 34 is inserted into the front housing 12 can be reduced, but also the radial load on the stator frame 34 caused by the compression reaction force of the sealing member 131 can be suppressed, so it is easy to ensure the coaxial accuracy when assembling the front housing 12 and the stator frame 34. Since the front housing 12 supports the rotor 4, this structure helps to improve the coaxial accuracy of the stator 3 and the rotor 4.

[0041] The base portion 133 includes a first base portion 133A disposed on the right side of the convex portion 132 and a second base portion 133B disposed on the left side. Therefore, the sealing member 131 is supported at three points, so that the compressive load applied to the sealing member 131 can be made equal, and the sealing performance can be easily ensured. In addition, by equalizing the compressive load, the compressive reaction force of the sealing member 131 can be easily aligned on the same line from the central axis of the front housing 12 and the radial direction. When the stator frame 34 is installed on the front housing 12, it is easy to align the front housing 12 and the stator frame 34 coaxially, and the assembly workability is good.

[0042] <Example 2> Figure 8 It is a figure which shows the shape of the sealing member 131 of Example 2.

[0043] The sealing member 131 of the second embodiment is different from the sealing member 131 of the first embodiment in that it does not have the second space portion 135B, but has the same functions and effects as those of the first embodiment. The description of the configuration having the same functions as the first embodiment is omitted, and the different configurations are mainly described.

[0044] In the second embodiment, the base portion 133 has a protruding portion 133C and a space forming portion 134 composed of a base first portion 133A and a base second portion 133B. The space forming portion 134 has a first space portion 135A that forms a space between the stator frame 34 and the sealing member 131 along the stator frame 34. The height of the protruding portion 133C is small relative to the height of the base portion 133, and is approximately one tenth of the height in the present embodiment.

[0045] When the stator frame 34 is installed in the front housing 12, the protrusion 133C of the sealing member 131 contacts the stator frame 34 and is compressed by the front housing 12 and the stator frame 34. A part of the volume of the protrusion 133C compressed by the stator frame 34 compresses the first base portion 133A and the second base portion 133B, and a part of the volume of the space forming portion 134 is pushed out to the side of the stator frame 34. The pushed out space forming portion 134 contacts the stator frame 34.

[0046] In this structure, since the area of ​​the seal member 131 compressed by the stator frame 34 is a part of the seal member 131 facing the stator frame 34, the load of compressing the seal member 131 can be suppressed, and the area of ​​the seal member 131 in contact with the stator frame 34 becomes substantially the entire surface of the seal member 131 facing the stator frame 34, and the sealing performance between the stator frame 34 and the seal member 131 can be ensured. Therefore, the sealing performance that separates the flow path from the coolant inlet 111 and the flow path to the coolant outlet 112 is ensured, and the friction force when the stator frame 34 is installed in the front housing 12 from the axial direction while compressing the seal member 131 is small, so the assembly workability is good.

[0047] In this embodiment, not only the friction force when the stator frame 34 is inserted into the front housing 12 can be reduced, but also the radial load on the stator frame 34 caused by the compression reaction force of the sealing member 131 can be suppressed, so it is easy to ensure the coaxial accuracy when assembling the front housing 12 and the stator frame 34. Since the front housing 12 supports the rotor 4, this structure helps to improve the coaxial accuracy of the stator 3 and the rotor 4.

[0048] Since the base portion 133 includes the first base portion 133A disposed on the right side of the convex portion 132 and the second base portion 133B disposed on the left side, the sealing member 131 is supported at three points, so that the compressive load applied to the sealing member 131 can be made equal, and the sealing performance can be easily ensured. In addition, by equalizing the compressive load, the compressive reaction force of the sealing member 131 can be easily aligned on the same line from the central axis of the front housing 12 and the radial direction, and when the stator frame 34 is installed on the front housing 12, it is easy to align the front housing 12 and the stator frame 34 coaxially, and the assembly workability is good.

[0049] <Example 3> Fig. 9 It is a figure which shows the shape of the sealing member 131 of Example 3.

[0050] The sealing member 131 of the third embodiment is different from the sealing member 131 of the second embodiment in that a clear protrusion 133C is not formed, but a portion of the first base portion 133A and the second base portion 133B has the maximum thickness in the base portion 133 and has the same function as the protrusion 133C of the second embodiment. Therefore, the third embodiment has the same function and effect as a portion of the first embodiment. In addition, the description of the configuration having the same function as the first and second embodiments is omitted, and the different configuration is mainly described.

[0051] In Example 3, the base portion 133 has a space forming portion 134 formed of a base first portion 133A and a base second portion 133B. The space forming portion 134 has a first space portion 135A that forms a space between the stator frame 34 and the sealing member 131 along the stator frame 34 .

[0052] When the stator frame 34 is installed in the front housing 12, the stator frame 34 compresses the first base portion 133A and the second base portion 133B, and a part of the volume of the space forming portion 134 is pushed out to the stator frame 34. The pushed out space forming portion 134 contacts the stator frame 34.

[0053] In this structure, since the area of ​​the seal member 131 compressed by the stator frame 34 is a part of the seal member 131 facing the stator frame 34, the load of compressing the seal member 131 can be suppressed, and the area of ​​the seal member 131 in contact with the stator frame 34 becomes substantially the entire surface of the seal member 131 facing the stator frame 34, and the sealing performance between the stator frame 34 and the seal member 131 can be ensured. Therefore, the sealing performance that separates the flow path from the coolant inlet 111 and the flow path to the coolant outlet 112 is ensured, and the friction force when the stator frame 34 is installed in the front housing 12 from the axial direction while compressing the seal member 131 is small, so the assembly workability is good.

[0054] In this embodiment, not only the friction force when the stator frame 34 is inserted into the front housing 12 can be reduced, but also the radial load on the stator frame 34 caused by the compression reaction force of the sealing member 131 can be suppressed, so it is easy to ensure the coaxial accuracy when assembling the front housing 12 and the stator frame 34. Since the front housing 12 supports the rotor 4, this structure helps to improve the coaxial accuracy of the stator 3 and the rotor 4.

[0055] Since the base portion 133 includes the first base portion 133A disposed on the right side of the convex portion 132 and the second base portion 133B disposed on the left side, the sealing member 131 is supported at three points, so that the compressive load applied to the sealing member 131 can be made equal, and the sealing performance can be easily ensured. In addition, by equalizing the compressive load, the compressive reaction force of the sealing member 131 can be easily aligned on the same line from the central axis of the front housing 12 and the radial direction, and when the stator frame 34 is installed on the front housing 12, it is easy to align the front housing 12 and the stator frame 34 coaxially, and the assembly workability is good.

[0056] <Example 4> Fig.10 It is a figure which shows the shape of the sealing member 131 of Example 4.

[0057] Although the sealing member 131 of the fourth embodiment does not have any of the first space portion 135A and the second space portion 135B, that is, it is different from the sealing member 131 of the above-mentioned embodiment in that it does not have the space forming portion 134, the first base portion 133A and a part of the second base portion 133B have the maximum thickness in the base portion 133, and have the same function as the protrusion 133C of the third embodiment through the elastic deformation of the base portion 133. Therefore, the fourth embodiment has the same function and effect as the third embodiment. In addition, the description of the configuration having the same function as the first, second, and third embodiments is omitted, and the different configurations are mainly described.

[0058] In the fourth embodiment, the base 133 is composed of a first base portion 133A and a second base portion 133B.

[0059] When the stator frame 34 is assembled into the front housing 12 , the first base portion 133A and the second base portion 133B are compressed by the stator frame 34 , so that the base portion 133 is pressed against the stator frame 34 .

[0060] In this structure, the area where the sealing member 131 contacts the stator frame 34 is substantially the entire surface of the sealing member 131 facing the stator frame 34, and the sealing performance between the stator frame 34 and the sealing member 131 can be ensured. Therefore, the sealing performance that separates the flow path from the coolant inlet 111 and the flow path to the coolant outlet 112 can be ensured.

[0061] Since the base portion 133 includes the first base portion 133A disposed on the right side of the convex portion 132 and the second base portion 133B disposed on the left side, the sealing member 131 can be reliably supported from above and below, so that the compressive load applied to the sealing member 131 can be made equal, and the sealing performance can be easily ensured. In addition, by equalizing the compressive load, the compressive reaction force of the sealing member 131 can be easily aligned on the same line from the central axis of the front housing 12 and the radial direction, and when the stator frame 34 is installed on the front housing 12, the front housing 12 and the stator frame 34 can be easily aligned coaxially, and the assembly workability is good.

[0062] In addition, the present invention is not limited to the embodiments described, but includes various modifications and equivalent structures within the scope of the appended claims. For example, the embodiments described are described in detail to facilitate the understanding of the present invention, and the present invention is not limited to all the structures described. In addition, a part of the structure of an embodiment can be replaced with the structure of other embodiments. In addition, the structure of other embodiments can be added to the structure of one embodiment. In addition, for a part of the structure of each embodiment, other structures can be added, deleted, or replaced.

[0063] For example, the stator frame 34 and the rear housing 11 may be integrated, and the stator 3 does not depend on the winding structure (eg, concentrated winding or distributed winding).

[0064] Explanation of symbols

[0065] 3…stator, 4…rotor, 11…rear housing, 12 front housing, 15…coolant flow path, 16…O-ring, 34…stator frame, 100…rotating electric machine, 111…coolant inlet, 112…coolant outlet, 123…recess, 131…sealing member, 132…convex portion, 133…base portion, 133A…first base portion, 133B…second base portion, 133C…contact portion, 134…space forming portion, 135A…first space portion, 135B…second space portion.

Claims

1. A rotating electrical machine comprising: a stator core wound with windings; a stator frame supporting the stator core; a housing, which is arranged outside the stator frame, and forms a flow path space between the housing and the stator frame; as well as a sealing member disposed between the stator frame and the housing, The rotating electrical machine is characterized in that The housing has a fitting portion on which the sealing member is fitted, The sealing member comprises: a base portion formed in a shape extending in a circumferential direction along a contact surface with the stator frame; as well as a mounting portion that protrudes from the base portion and is inserted into the fitting portion of the housing, The base portion has a space forming portion at a position facing the stator frame, which can change the shape of the contact surface by pressing the stator frame and the housing. The space forming portion forms a first space portion extending in a radial direction on the contact surface side of the base portion, and forms a second space portion protruding toward the mounting portion in the central portion of the first space portion as a space that can be reduced by pressing the stator frame and the housing.

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