JP5135156B2 - Servo motor liquid cooling structure and liquid cooling motor - Google Patents

Description

  The present invention relates to a servo motor liquid cooling structure and a liquid cooling motor, and more particularly to a servo motor liquid cooling structure and a liquid cooling motor provided with a coolant flow path for flowing a cooling liquid.

  A liquid-cooled motor that cools through a coolant has a higher cooling capacity than an air-cooled motor. Therefore, when a high load is continuously applied or when the motor rotates at high speed, temperature rise in each part of the motor can be suppressed. This liquid-cooled motor is disclosed in Patent Document 1. In Patent Document 1, a method of providing a groove for a coolant flow path in a liquid-cooled motor is disclosed. That is, in the liquid-cooled motor, a flow path for the coolant is provided in the central casing, and the coolant flow path is communicated with the front end casing (bracket) disposed at the front end of the central casing. The rear end casing (bracket) disposed at the rear end of the central casing is provided with another groove for communicating the coolant flow path (patent). Reference 1).

In some cases, a heat sink 200 is attached to the surface of the servo motor frame as shown in FIG. 6, or a spurious metal tube 201 is embedded in the servo motor frame to allow coolant liquid to flow as shown in FIG.
JP-A-6-86506

  However, in the liquid cooling motor disclosed in Patent Document 1, the front end casing (bracket) is provided with one groove for communicating the coolant flow path, and the rear end disposed at the rear end. Since the casing (bracket) is provided with another groove for communicating the coolant flow path, the sealing packing disposed between the center casing and the front end casing, and the center The sealing packing arranged between the front casing and the rear end casing cannot be used as it is, and each packing has the shape of the first groove of the front end casing and the second groove of the rear end casing. You must use what was processed together.

  Moreover, since grooves are formed in the front end casing and the rear end casing, respectively, the sealing performance between the central casing and the front end casing and the sealing performance between the central casing and the rear end casing may be reduced. There is.

In the conventional example shown in FIG. 6 , since the heat sink is only attached to the surface of the frame, the heat sink and the frame are not integrally formed, so that the cooling effect of the frame is small. In the conventional example shown in FIG. 7, the frame structure becomes complicated.

Therefore, the present invention has been made to solve the above-mentioned problems, and the object of the present invention is to provide a groove portion that communicates each coolant flow path of the central frame with one end bracket and the other end bracket. Without being provided, it is formed at one end and the other end of the central frame, so that it rises to the packing that seals between the one end bracket and the central frame and between the other end bracket and the central frame. only form a part, can be directly used without any special processing, yet sealing between the sealing property between the end bracket and the central portion the frame, the other end portion bracket and the central portion the frame to provide a servo motor liquid cooling structure and the liquid cooling motor may Rukoto improve sexual.

In the servo motor liquid cooling structure of the present invention, one end bracket, the other end bracket, and a central frame arranged between the one end bracket and the other end bracket are arranged side by side in the longitudinal direction. It is applied to a servo motor that constitutes a casing and has a seal packing between the one end bracket and the central frame and between the other end bracket and the central frame. In the servo motor liquid cooling structure, a plurality of pairs of cooling liquid passages for allowing the cooling liquid to pass therethrough are formed through the central frame along the longitudinal direction. At one end, the provided first grooves portion for communicating the flow path of the cooling liquid is provided, at the other end of the central portion the frame, first for communicating the flow path of the cooling liquid 2 Groove is provided Is is, the sealing gasket between the end portion and the one end bracket of the central portion the frame, the first groove portion and so as to correspond to the channel, protruding in a direction away from the central portion frame A raised portion is provided, and a seal packing between the other end portion of the center frame and the other end bracket is provided in correspondence with the second groove portion and the flow path, and the center portion A swelled portion protruding in a direction away from the frame is provided .

  Further, in the servo motor liquid cooling structure of the present invention, preferably, the first groove portion of the one end portion and the second groove portion of the other end portion of the center portion frame are arranged in a circumferential direction of the center portion frame. It is characterized by being formed along.

Furthermore, in the liquid cooling motor of the present invention, one end bracket, the other end bracket, and a central frame disposed between the one end bracket and the other end bracket are arranged side by side in the longitudinal direction. A liquid that is applied to a motor that constitutes a casing and has a seal packing between the one end bracket and the central frame and between the other end bracket and the central frame. A liquid cooling motor having a cooling structure, wherein a plurality of pairs of cooling liquid passages for allowing the cooling liquid to pass therethrough are formed through the central frame along the longitudinal direction. at one end of the frame, the first groove portion for communicating the flow path of the cooling fluid is provided with, at the other end of the central portion the frame, for communicating the flow path of the cooling liquid Second groove part is provided Are, the sealing gasket between the end portion and the one end bracket of the central portion the frame, the first groove portion and so as to correspond to the channel, protruding in a direction away from the central portion frame A raised portion is provided, and a seal packing between the other end portion of the center frame and the other end bracket is provided in correspondence with the second groove portion and the flow path, and the center portion upsurge portion projecting away from the frame and wherein the provided Turkey.

According to the present invention, the groove portion that communicates each coolant flow path of the central frame is formed in the one end portion and the other end portion of the central frame without providing the one end bracket and the other end bracket. in, only form with between one end bracket and the central portion the frame, the uplink portion serving to seal to seal between the other end bracket and the central portion the frame, be directly used without any special machining It can be, moreover a sealing property between the end bracket and the central portion frame, a servomotor liquid cooling structure and the liquid cooling motor may Rukoto improve the sealability between the other end bracket and the central portion the frame Can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a structural example of a servo motor having a preferred embodiment of a servo motor liquid cooling structure of the present invention. FIG. 2 is an exploded perspective view showing the servo motor shown in FIG.

  In the illustrated example, a liquid cooling servo motor is shown as an example of the liquid cooling motor.

  A servo motor 1 shown in FIGS. 1 and 2 is used in, for example, a molding machine such as a machine tool or an injection molding machine, an industrial robot, or the like, and has a servo motor liquid cooling structure 10. The servo motor liquid cooling structure 10 forcibly cools the servo motor 1 with a cooling liquid (coolant liquid), and in particular, improves the cooling function of the central frame 13 of the servo motor to increase the output of the servo motor 1. Can do.

  As shown in FIGS. 1 and 2, the servo motor 1 has a casing 2, a terminal box 3, an output shaft 4, a wiring portion 5, and a servo motor liquid cooling structure 10. The cooling liquid passed through the servo motor liquid cooling structure 10 is, for example, water, but is not particularly limited, and may be a coolant liquid other than water.

  The casing 2 includes a first end bracket 11, a second end bracket 12, and a central frame 13 disposed between the first end bracket 11 and the second end bracket 12. That is, the one end bracket 11, the other end bracket 12, and the central frame 13 are arranged side by side in the longitudinal direction CL, which constitutes the casing 2.

  As shown in FIG. 2, the one end bracket 11 is also called a front end bracket, the other end bracket 12 is also called a rear end bracket, and the one end bracket 11 and the other end bracket 12 are both substantially square plate members. is there. A circular opening 11B is formed in the center of the one end bracket 11 with the axial direction CL as the center, and a circular opening 12B is formed in the center of the other end bracket 12 with the axial direction CL as the center. .

  As shown in FIGS. 1 and 2, the central frame 13 is a substantially rectangular parallelepiped member. The central frame 13 is provided with a servo motor liquid cooling structure 10. A cylindrical internal space 10B is formed around the axial direction CL.

  As shown in FIG. 2, a gasket 21 serving as a sealing material is interposed between the inner surface 11 </ b> C of the one end bracket 11 and the first end 13 </ b> B of the central frame 13. Similarly, between the inner surface 12C of the other end bracket 12 and the second end portion 13C of the central frame 13, a gasket 22 as a sealing material for sealing is sandwiched and disposed.

  Holes 11H through which screws are passed are formed at the four corners of the one end bracket 11, and the four screws 23 pass through the holes 11H at the four corners of the one end bracket 11, respectively. The gasket 21 is sandwiched and fixed by screwing into the female screws 13D at the four corners of the portion 13B. Similarly, holes 12H through which screws are passed are formed at the four corners of the other end bracket 12, and the four screws 24 pass through the holes 12H at the four corners of the other end bracket 12, respectively. The gasket 22 is fixed in a state of being sandwiched by screwing into the female screws 13F at the four corners of the second end portion 13C of the frame 13.

  The case where the servo motor 1 shown in FIG. 1 is an SM (synchronous) type AC (alternating current) servo motor will be described as an example.

  A rotor 30 is supported in the columnar inner space 10B of the casing 2 shown in FIG. 1 so as to be rotatable about the axial direction CL. The rotor 30 has an output shaft 4 disposed along the axial direction CL, and a permanent magnet 31 fixed to the output shaft 4.

  On the other hand, the armature coil 33 of the stator 32 is disposed on the inner peripheral surface side of the casing 2 forming the columnar inner space 10B. By energizing the armature coil 33 of the stator 32, the magnetic field generated by the armature coil 33 and the magnetic field of the permanent magnet 31 of the rotor 30 act to rotate the rotor 30.

  Next, the servo motor liquid cooling structure 10 of the central frame 13 will be described with reference to FIGS.

  3A is a side view of the first end 13B of the center frame 13 and the gasket 21 as viewed from the H1 direction of FIG. 2, and FIG. 3B is a second end of the center frame 13. It is the side view which looked at 13C and the gasket 22 from the H2 direction of FIG.

  As shown in FIGS. 2, 3 (A) and 3 (B), the central frame 13 has three pairs of coolant flow paths 51, 52, 52 along the axial direction CL (longitudinal direction). 53 is formed.

  The coolant flow paths 51, 52, and 53 are through holes that extend from the end face of the first end 13B to the end face of the second end 13C along the axial direction CL, as shown in FIG. They are formed at intervals 54, 55, 56 along the circumferential direction centered on CL. Thereby, cooling can be performed efficiently over the perimeter direction of a center part frame. The coolant channel 51 includes channels 61 and 62, the coolant channel 52 includes channels 63 and 64, and the coolant channel 53 includes channels 65 and 66. Have.

  As shown in FIGS. 2, 3, and 5, a water supply port 71 and a drainage port 72 are provided in the upper part of the central frame 13, and the water supply port 71 is connected to the flow path 61. It is connected to the channel 66. As shown in FIG. 2, the water supply port 71 and the drain port 72 are connected to a coolant supply source 73.

  As shown in FIG. 3A, at the first end 13B of the central frame 13, the first groove portion 81 for communicating the end of the flow path 61 and the end of the flow path 62 is provided in the flow path 61. And the end of the flow path 62 are formed along the circumferential direction.

  Similarly, in the first end 13B of the central frame 13, the first groove portion 82 for communicating the end of the flow path 63 and the end of the flow path 64 is formed between the end of the flow path 63 and the flow path. 64 is formed along the circumferential direction between the end portions of 64, and a first groove portion 83 for communicating the end portion of the flow path 65 and the end portion of the flow path 66 is formed between the end portion of the flow path 65 and the flow path. It is formed along the circumferential direction between the end portions of 66. As a result, as shown in FIG. 3A, at the first end 13B of the central frame 13, the first groove portion 81 that communicates the end of the flow path 61 and the end of the flow path 62 has a flow path. Water that has passed through 61 can be passed to the flow path 62 side. Similarly, at the first end 13B of the central frame 13, the first groove portion 82 that communicates the end of the flow path 63 and the end of the flow path 64 allows the water that has passed through the flow path 63 to flow. 64 side can be passed. In the first end 13B of the central frame 13, the first groove portion 83 that communicates the end of the flow path 65 and the end of the flow path 66 allows the water that has passed through the flow path 65 to pass to the flow path 66 side. be able to. The first groove portions 81, 82, 83 are formed on the end face of the first end portion 13 </ b> B of the central frame 13 in a shape that extends along the circumferential direction centering on the central axis CL, and the central frame It is formed by mechanically shaving the 13 first end portions 13B.

  Further, as shown in FIG. 3B, in the second end portion 13C of the central frame 13, the second groove portion 91 for communicating the end portion of the flow path 62 and the end portion of the flow path 63 has a flow. It is formed along the circumferential direction between the end of the path 62 and the end of the flow path 63. Similarly, in the second end portion 13 </ b> C of the central frame 13, the second groove portion 92 for communicating the end portion of the flow path 64 and the end portion of the flow path 65 is formed between the end portion of the flow path 64 and the flow path. Between the ends of 65, it is formed along the circumferential direction. As a result, at the second end 13C of the central frame 13, the second groove portion 91 that communicates the end of the flow path 62 and the end of the flow path 63 allows the water that has passed through the flow path 62 to flow through the flow path 63. Can be passed to the side. Similarly, at the second end 13C of the central frame 13, the second groove portion 92 that communicates the end of the flow path 64 and the end of the flow path 65 allows the water that has passed through the flow path 64 to flow. 65 can be passed. The second groove portions 91 and 92 are formed on the end face of the second end portion 13 </ b> C of the central frame 13 in a shape spreading along the circumferential direction centering on the central axis CL. It is formed by mechanically scraping the end face of the second end portion 13C.

  When the pump 75 shown in FIG. 2 is operated, the cooling water supplied from the coolant supply source 73 through the water supply port 71 is indicated by arrows W1, W2, W3, W4, W5 and arrows W6 shown in FIGS. As shown in the flow order indicated by, the flow passes through the flow paths 61, 62, 63, 64, 65 and the flow path 66 of the central frame 13 and is returned to the coolant supply source 73 through the drain port 72. ing. That is, the cooling water supplied from the coolant supply source 73 through the water supply port 71 passes through the channel 61 (arrow W1), the first groove portion 81, and the channel 62 (arrow W2), and passes through the second groove portion 91. And the flow path 63 (arrow W3), the first groove portion 82 and the flow path 64 (arrow W4), and further the second groove portion 92, the flow path 65 (arrow W5), the first groove portion 83 and the flow path 66 ( It passes through the arrow W6).

  Next, the gaskets 21 and 22 shown in FIGS. 2 and 4 will be described.

  4A shows the gasket 21, and FIG. 4B shows the gasket 22.

  The gasket 21 shown in FIG. 4 (A) and the gasket 22 shown in FIG. 4 (B) have substantially the same shape, and the four corner portions are cutout portions 100 respectively. The gaskets 21 and 22 have a circular hole 101 at the center.

  In the gasket 21 shown in FIG. 4 (A), raised portions 111 to 113 are formed so as to protrude in the direction perpendicular to the plane of FIG. 4 (A) along the circumferential direction around the axial direction CL. The raised portions 111 to 113 are formed corresponding to the end portions of the flow paths 61 to 66 in the first end portion 13B of the central frame 13 shown in FIG. That is, the raised portion 111 is formed corresponding to the flow path 61, the first groove portion 81, and the flow path 62. Similarly, the raised portion 112 is formed corresponding to the flow path 63, the first groove portion 82, and the flow path 64. The raised portion 113 is formed corresponding to the flow path 65, the first groove portion 83, and the flow path 66.

  Further, the gasket 22 shown in FIG. 4 (B) is formed with raised portions 131 to 134 protruding in the direction perpendicular to the paper surface in FIG. 4 (B) along the circumferential direction centering on the axial direction CL. The raised portions 131 to 134 are formed so as to correspond to the end portions of the flow paths 61 to 66 in the second end portion 13C of the central frame 13 shown in FIG. That is, the rising portion 131 is formed corresponding to the flow path 61. Similarly, the raised portion 132 is formed corresponding to the flow path 62, the second groove portion 91, and the flow path 63. The raised portion 133 is formed corresponding to the flow path 64, the second groove portion 92, and the flow path 65. The raised portion 134 is formed corresponding to the flow channel 66.

  FIG. 4C illustrates an example of a cross-sectional shape of the raised portion 111 and the raised portion 133 taken along line XX. The example of the cross-sectional shape of the rising portion shown in FIG. 4C is also applied to the remaining rising portions 112 and 113 and the rising portions 131, 132, and 134. In the example of the cross-sectional shape of the swelled portion shown in FIG. 4C, it has an inclined portion 300 and a flat portion 301, and the inner recess 302 is a portion through which water for cooling passes. By adopting such a cross-sectional shape of the swelled portion, the gaskets 21 and 22 can be cut off even when higher-pressure cooling water is sent to the recess 302 through each flow path.

  FIG. 5 shows the upper surface side of the central frame 13, and the water supply port 71 and the water discharge port 72 are provided side by side in a direction orthogonal to the axial direction CL.

  Next, an example of cooling operation of the servo motor 1 having the above-described configuration will be described.

  When the rotor 30 of the servo motor 1 shown in FIG. 1 rotates relative to the stator 32, heat is generated.

Therefore, by operating the pump 75 shown in FIG. 2, the cooling water supplied from the coolant supply source 73 through the water supply port 71 is supplied with the arrows W1, W2, W3, W4, W5 shown in FIGS. As shown by the flow order indicated by the arrow W 6, the flow passes through the flow paths 61, 62, 63, 64, 65 and the flow path 66 of the central frame 13 and returns to the coolant supply source 73 through the drain port 72. It is . Ie, water for cooling is supplied through the water supply port 71 from the cooling liquid supply source 73 passes through the passage 61 (arrow W1) and the first groove portion 81 the passage 62 (arrow W2), the second groove It passes through the portion 91, the channel 63 (arrow W3), the first groove portion 82, and the channel 64 (arrow W4), and further the second groove portion 92, the channel 65 (arrow W5), the first groove portion 83, and the channel. 66 (arrow W6). For this reason, the cooling water is returned to the coolant supply source 73 through the drain port 72 while cooling the entire central frame 13. As a result, the servo motor 1 can be efficiently cooled using the entire central frame 13 while circulating cooling water.

  In the servo motor liquid cooling structure 10 according to the embodiment of the present invention described above, the first groove portions 81 and 82 communicating with the flow paths 61, 62, 63, 64 and 65 of the cooling liquid in the central frame 13 and the flow path 66. , 83 are formed at one end 13B of the central frame 13. Moreover, second groove portions 91 and 92 communicating with the coolant flow paths 62, 63, 64 and 65 are formed in the other end portion 13 </ b> C of the central frame 13.

Thereby, since it is not necessary to provide the groove part for connecting each flow path in the one end bracket 11 and the other end bracket 12, between the one end bracket 11 and the central frame 13 and the other end portion. only form the upstream portion primes the gasket 21, 22 is a gasket for sealing between the bracket 12 and the central portion the frame 13, it can be used without any special processing, yet one end bracket 11 It is possible to improve the airtightness between the central frame 13 and the other end bracket 12 and the central frame 13 .
In the servo motor liquid cooling structure of the present invention, the one end bracket, the other end bracket, and the central frame arranged between the one end bracket and the other end bracket are arranged side by side in the longitudinal direction. And a liquid cooling structure applied to a servo motor having a seal packing between the one end bracket and the center frame and between the other end bracket and the center frame. The central frame is formed with a plurality of pairs of cooling liquid passages through which the cooling liquid passes in the longitudinal direction, and a cooling liquid flow path is formed at one end of the central frame. A first groove portion for communication is provided , and a second groove portion for connecting a coolant flow path is provided at the other end portion of the central frame, and one end portion of the central frame. Between the bracket and one end bracket The seal packing is provided with a raised portion that protrudes in a direction away from the center frame, corresponding to the first groove portion and the flow path, and between the other end of the center frame and the other end bracket. The seal packing in between is provided with a raised portion that protrudes in a direction away from the center frame, corresponding to the second groove portion and the flow path . Thus, one end portion and the other end portion of the central frame are formed at the one end portion and the other end portion without providing the groove portions communicating with the coolant flow paths of the central portion frame at the one end bracket and the other end bracket. and between the parts bracket and the central portion the frame, simply to form the upstream portion serving to seal to seal between the other end bracket and the central portion the frame, as it can be used without any special processing, Moreover it is Rukoto improve the sealing property between the end bracket and the central portion the frame, the sealing property between the other end bracket and the central portion the frame.

  Moreover, the 1st groove part of the one end part of the center part frame and the 2nd groove part of the other end part are formed along the circumferential direction of the center part frame. Thereby, cooling can be performed efficiently over the perimeter direction of a center part frame.

In the liquid cooling motor of the present invention, one end bracket, the other end bracket, and a central frame arranged between the one end bracket and the other end bracket are arranged side by side in the longitudinal direction to form a casing. A liquid cooling motor having a liquid cooling structure applied to a motor having a seal packing between the one end bracket and the central frame and between the other end bracket and the central frame. In the liquid cooling structure, a plurality of pairs of cooling liquid passages for allowing the cooling liquid to pass therethrough are formed through the central frame along the longitudinal direction. the first groove portion for communicating the flow path of the cooling fluid is provided with, at the other end portion of the central portion the frame, the second groove portion for communicating is provided a flow path of the cooling liquid , One end and one end block of the center frame The seal packing with the ket is provided with a raised portion that protrudes away from the central frame in correspondence with the first groove and the flow path. The seal packing between the end brackets is provided with a raised portion that protrudes in a direction away from the center frame, corresponding to the second groove portion and the flow path . Thus, one end portion and the other end portion of the central frame are formed at the one end portion and the other end portion without providing the groove portions communicating with the coolant flow paths of the central portion frame at the one end bracket and the other end bracket. and between the parts bracket and the central portion the frame, simply to form the upstream portion serving to seal to seal between the other end bracket and the central portion the frame, as it can be used without any special processing, Moreover it is Rukoto improve the sealing property between the end bracket and the central portion the frame, the sealing property between the other end bracket and the central portion the frame.

  The servo motor 1 is, for example, an SM (synchronous) type AC servo motor, an IM (induction) type AC (alternating current) servo motor, or a DC (direct current) servo motor.

  Further, the liquid cooling motor of the present invention is not limited to a servo motor, but can be applied to other types of motors.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage.

  Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

It is a figure which shows the structural example of the servomotor which has preferable embodiment of the servomotor liquid cooling structure of this invention. It is a disassembled perspective view which shows the servomotor shown in FIG. 3A is a side view of the first end of the center frame and the gasket as viewed from the H1 direction of FIG. 2, and FIG. 3B is a diagram of the second end of the center frame and the gasket. It is the side view seen from H2 direction. FIG. 4A and FIG. 4B are diagrams showing gaskets, respectively. It is a top view of a center part frame. It is a figure which shows a prior art example. It is a figure which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Servo motor 2 Casing 10 Servo motor liquid cooling structure 11 One end bracket 12 Other end bracket 13 Central frame 13B First end of central frame 13C Second end of central frame 21, 22 Gasket (for sealing Example of sealing material)
30 Rotor 32 Stator 51, 52, 53 Three pairs of coolant flow path portions 54, 55, 56 Spacing portion 61-66 Coolant flow passage 71 Water supply port 72 Drain port 81, 82, 83 First groove portion 91, 92 Second groove portion CL Axial direction

Claims (3)

One end bracket, the other end bracket, and a central frame disposed between the one end bracket and the other end bracket are arranged side by side in the longitudinal direction to form a casing, and the one end bracket, Servo motor liquid cooling structure applied to a servo motor having a seal packing between the center frame and between the other end bracket and the center frame,
In the central frame, a plurality of pairs of cooling liquid passages for passing the cooling liquid are formed penetrating along the longitudinal direction,
Wherein the one end of the central portion the frame, a first groove portion for communicating is provided a flow path of the cooling liquid,
The other end of the central frame is provided with a second groove portion for communicating the coolant flow path ,
The seal packing between the one end portion of the central frame and the one end bracket has a raised portion protruding in a direction away from the central frame, corresponding to the first groove portion and the flow path. Provided,
The seal packing between the other end portion of the center frame and the other end bracket has a raised portion protruding in a direction away from the center frame, corresponding to the second groove portion and the flow path. Part is provided ,
Servo motor liquid cooling structure. In the servo motor liquid cooling structure according to claim 1,
It said second groove portion of the first groove portion and the other end portion of the one end of the central portion frame is made form along the circumferential direction of the central portion frame,
Features and to salicylate Bomota liquid cooling structure that. One end bracket, the other end bracket, and a central frame disposed between the one end bracket and the other end bracket are arranged side by side in the longitudinal direction to form a casing, and the one end bracket, A liquid cooling motor having a liquid cooling structure applied to a motor having a seal packing between the central frame and between the other end bracket and the central frame, ,
In the central frame, a plurality of pairs of cooling liquid passages for passing the cooling liquid are formed penetrating along the longitudinal direction,
Wherein the one end of the central portion the frame, a first groove portion for communicating is provided a flow path of the cooling liquid,
The other end of the central frame is provided with a second groove portion for communicating the coolant flow path ,
The seal packing between the one end portion of the central frame and the one end bracket has a raised portion protruding in a direction away from the central frame, corresponding to the first groove portion and the flow path. Provided,
The seal packing between the other end portion of the center frame and the other end bracket has a raised portion protruding in a direction away from the center frame, corresponding to the second groove portion and the flow path. Part is provided ,
Liquid cooled motor you wherein a.

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