JP2006271150A - Cooling structure of motor-generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling structure of a motor-generator for facilitating its manufacture. <P>SOLUTION: The cooling structure is provided with a blocking member for blocking openings 5C of a plurality of slots 5A for receiving a stator coil 7 and having the openings 5C of the slot 5A on inner circumference of a cylindrical stator core 5, and a cooling jacket 6 liquid-tightly attached to front and back ends of the stator core 5 around a coil end 7A of the stator coil 7 protruding from the front and back ends of the stator core 5 and forming a liquid-tight annular space. A narrow and small section 11 and an extended section 12 to the slots 5A are formed by circumferentially expanding both teeth 5B at the openings 5C of a plurality of the slots 5A. The blocking member contacts the extended section 12 to the slots 5A from the narrow and small section 11 at the openings 5C of the slots 5A, and is formed by a seal member 10A inserted from the front and/or back end of the stator core 5 in the axial direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a motor generator cooling structure, and more particularly to a motor generator cooling structure suitable for liquid cooling of a stator coil.

  Conventionally, in order to cool a stator coil of a motor generator, a cooling jacket is formed that accommodates a coil end projecting in an annular shape from the end face of the stator core and forms an annular space defined by a space in the motor. A cooling structure for a motor generator that circulates cooling oil has been proposed (see Patent Document 1).

The resin coating layer covers the inner peripheral surface of the stator core and closes the openings of the plurality of slots, and is liquid-tightly attached to the front end and the rear end of the stator core, and protrudes from the front end and the rear end, respectively. A cover member that surrounds the end of the winding, and a cooling liquid that is provided in the cover member and is introduced into the space adjacent to the winding defined by the stator core, the coating layer, and the cover member. A cooling structure for a stator winding having an inlet and an outlet for cooling liquid for discharging, each of a plurality of slots, a pair of recesses formed on both side walls of the slot in the vicinity of the opening, A pair of shoulders erected from both side walls between the recesses and the openings, and a covering layer is filled between the recesses and the openings of each of the plurality of slots to form the shoulders A plurality of engaging portions to be engaged and the inner peripheral surface of the stator core And a covered portion of the annular covering the body, and their filling portion and the covering portion are integrally molded from the same resin material.
Japanese Patent No. 2716286

  However, in the above conventional example, in order to fill the filling portion and the covering portion with the resin material, a pair of recesses are formed on both side walls of the slot in the vicinity of the openings of the plurality of slots. With the core inserted between them, the stator core is placed in a mold, and a resin material is injected into the space defined by the core, the stator core, and the mold, covering the entire inner peripheral surface of the stator core Thus, a complicated manufacturing process is required in which a coating layer that closes the openings of the plurality of slots is formed, and the core and the mold are detached from the stator core formed with the coating layer.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a motor generator cooling structure suitable for facilitating manufacture.

  The present invention includes a cylindrical stator core provided with a plurality of slots for accommodating stator coils, the openings of the slots being provided on the inner peripheral surface, a closing member for closing the openings of the plurality of slots of the stator core, and a front end of the stator core And a cooling jacket that is attached to the rear end in a liquid-tight manner, surrounds the coil ends of the stator coil that respectively protrude from the front end and the rear end of the stator core, and forms a liquid-tight annular space, and is provided in the cooling jacket, A cooling structure for a motor generator, comprising a cooling medium inlet and outlet for introducing and discharging a cooling medium to and from a space for accommodating a stator coil defined by a stator core, a closing member, and a cooling jacket. At the open end of each slot, the teeth on both sides bulge in the circumferential direction to the narrow part and slot The enlarged portion is formed, the closing member is formed by a sealing member inserted from the front and / or rear end of the stator core in contact with the enlarged portion of the slot from the narrow portion of the slot opening in the axial direction.

  Therefore, in the present invention, the teeth on both sides are bulged in the circumferential direction at each open end of the plurality of slots to form a narrow portion and an enlarged portion to the slot, and the closing member is the narrow portion of the slot opening. Since it is formed by a seal member that is inserted in the axial direction from the front end and / or rear end of the stator core in contact with the enlarged portion from the portion to the slot, filling of the resin material that requires a core and a mold or the stator core Thus, a cooling structure for the motor generator can be obtained easily without requiring a manufacturing process of removing the core and the mold.

  The motor generator cooling structure of the present invention will be described below based on each embodiment.

(First embodiment)
1 to 9 show a first embodiment of a motor generator cooling structure to which the present invention is applied. FIG. 1 is a schematic view of a motor generator cooling structure. FIG. 2 is a partial perspective view of a stator core and a base plate. Is a partial cross-sectional view of the stator core, FIG. 4 is a detailed view showing the shape of the first embodiment of the adapter, FIG. 5 is a schematic cross-sectional view of the cooling structure, and FIG. 6 is a perspective view showing the mounting procedure of the adapter of the first embodiment, 7 to 9 are a cross-sectional view, a detailed view, and a perspective view of the mounting procedure of the adapter of the second embodiment.

  In FIG. 1, the case 2 of the motor generator 1 includes a cylindrical plate 2A and side plates 2B and 2C that close the openings at both ends in the axial direction of the cylindrical plate 2A. A cylindrical rotor 3 is accommodated in the case 2. The rotor 3 has both ends of a rotating shaft 3A supported by side plates 2B and 2C via bearings 4, respectively, and is rotatable about the rotating shaft 3A. A cylindrical stator core 5 is disposed on the inner peripheral surface of the cylindrical plate 2 </ b> A so as to surround the outer periphery of the rotor 3. A predetermined gap is provided between the inner peripheral surface of the stator core 5 and the outer peripheral surface of the rotor 3.

  Between the both ends of the stator core 5 in the axial direction and the inside of the case 2, cooling jackets 6 made of an electrically insulating material having a U-shaped cross section are inserted so as to form an annular space. An annular cooling space is formed between each end face of the stator core 5. The cooling jacket 6 accommodates coil ends 7A protruding from the end face of the stator core 5 inside, the bottom walls 6A abut against the case side plates 2A and 2B, respectively, and the outer peripheral wall 6B is fitted to the inner surfaces of the case side plates 2A and 2B. The outer peripheral wall 6B and the inner peripheral wall 6C are fitted together with a base plate (not shown) arranged on the end surface of the stator core 5 and an adapter arranged on the inner peripheral side of the base plate with a seal or the like interposed therebetween. ing.

  An oil supply port 6D is provided in the bottom wall 6A of the portion of the cooling jacket 6 positioned below in the case 2 so as to penetrate the case side plates 2B and 2C, and the cooling oil passes through the oil supply port 6D. And supplied to the cooling jacket 6. This cooling oil flows upward in the gap space between the coil end 7A in the cooling jacket 6 while cooling the coil end 7A. An oil discharge port 6E provided through the case side plates 2A and 2B is provided at a corner between the outer peripheral wall 6B and the bottom wall 6A on the upper end side of the case 1 of the cooling jacket 6, and the cooling oil is oil drainage. It is configured to be discharged to the outside from the outlet 6E.

  As shown in FIG. 2, the stator core 5 is formed by laminating a large number of yokes alternately including a plurality of teeth portions 5B and slots 5A between the teeth portions 5B, and a base plate 8 is laminated at both ends of the lamination of the yokes. The stator coil 7 including the base plate 8 is wound around the tooth portion 5B and accommodated in the slot 5A. The cooling jacket 6 is positioned and fixed with respect to a base plate 8 fixed to the end face of the stator core 5. That is, the base plate 8 has a slot 8A and a tooth portion 8B having substantially the same inner and outer diameters as the stator core 5 and substantially the same shape as the yoke constituting the stator core 5, and is made of a thick plate electric insulating material. Further, a slot opening 8 </ b> C connected to the slot opening 5 </ b> C of the stator core 5 is similarly provided between the tooth portions 8 </ b> B. On the outer periphery of the base plate 8, a stepped portion 8 </ b> D that fits into an end portion of the outer peripheral wall 6 </ b> B of the cooling jacket 6 is provided.

  The base plate 8 is positioned and arranged at the end of the stator core 5 before the stator coil 7 is wound around the teeth 5B between the slots 5A of the stator core 5, and the insulating sheet 9 is arranged on the inner wall surface of the slot 5A. The stator coil 7 including the base plate 8 is wound in the slot 5 </ b> A, and the coil end 7 </ b> A is wound so as to be positioned outside the base plate 8. That is, the coil end 7A of the stator coil 7 is wound from one slot 5A to another slot 5A after changing its direction on the side surface of the base plate 8. The wound coil end 7A has a contour shape that expands radially outward as it moves away from the base plate 8 in the cooling jacket 6 in the axial direction.

  Although not shown in the drawings, the stator coil is wound around the end surface of the stator core in a state where an insulating plate is disposed in order to prevent contact between the stator coil and the metal of the stator core. Instead, adopting this base plate 8 can use the conventional manufacturing process (coil insertion process into the slot, coil winding process, coil end molding process) as it is without changing the conventional motor manufacturing process.

  The stator around which the stator coil 7 is wound is sealed by inserting the adapter 10 into the opening slit 5C of the slot 5A that opens to the inner peripheral side of the stator core 5 including the opening slit 8C of the slot 8A in the base plate 8. .

  As shown in FIG. 3 in an enlarged manner, the opening slits 5C and 8C of the base plate 8 and the stator core 5 are formed such that the inner peripheral side opening end is narrowly spaced by the teeth portion 5B bulging in the circumferential direction. A trapezoidal narrow portion 11 and an enlarged portion 12 gradually enlarged radially outward from the narrow portion 11 are provided, and the end of the enlarged portion 12 is a wall surface of the slot spaces 5A and 8A. In the slot spaces 5A and 8A, a stator coil 7 wound around the wall surface with an insulating sheet 9 interposed is accommodated.

  As shown in FIG. 4, the adapter 10 includes a sealing portion 10A inserted into the opening slit 8C of the slot 8A in the base plate 8 and the opening slit 5C of the slot 5A opened to the inner peripheral side of the stator core 5, and the end of the sealing portion 10A. And an annular portion 10B that connects the portions. The adapter 10 is formed by being divided into a plurality of parts in the circumferential direction, and the divided adapters 10 are engaged with the slot openings 5C and 8C of the base plate 8 and the stator core 5, respectively, so that the inner side of the base plate 8 and the stator core 5 is engaged. It is used in a state where it is engaged with the entire circumference. The adapter 10 of the first embodiment shown in FIG. 4 is divided into a front view (A), left and right side views (B), (C), and a DD line and an EE line of some divided pieces. Cross-sectional views (D) and (E) are shown. In the adapter 15 shown in FIG. 4, a structure in which eight seal portions 10A are connected by an annular portion 10B is shown.

  The seal portion 10A has substantially the same cross-sectional shape as the narrow portion 11 at the opening end of the slot openings 5C and 8C and a part of the enlarged portion 12 connected to the narrow portion 11, and after the stator coil 7 is wound, the opening slit When inserted into 5C and 8C, both sides thereof engage with the opposing surfaces of the teeth portion 5B constituting the narrow portion 11 and the enlarged portion 12 connected thereto. The seal portion 10A of the adapter 10 of the first embodiment is integrally formed with an extension portion 10C functioning as an insulating sheet connected to both side surfaces, and the extension portion 10C is connected to the stator coil 7 from the inner peripheral side of the slots 5A and 8A. The insulating function between the tooth portion 5B and the coil 7 is exhibited. The space defined by the slot 5A constitutes a cooling passage that houses the stator coil 7 and communicates between the left and right cooling jackets 6. For this reason, by providing a pressure difference in the left and right cooling jackets 6, the cooling oil flows from one cooling jacket 6 to the other cooling jacket 6 via the cooling passage by the slot 5 </ b> A. Can do.

  The annular portion 10B is configured by connecting ends of a plurality of seal portions 10A (eight seal portions 10A in the illustrated example) to each other. As shown in FIG. The seal portion 10A is positioned in the axial direction. On the back surface of the annular portion 10B, an annular protrusion 10D is provided that engages with the tip stepped portion 6J of the inner peripheral wall 6C of the cooling jacket 6 from the inner peripheral side. The annular protrusion 10D is fitted from the inner peripheral side to the stepped portion 6J at the end of the inner peripheral wall 6C of the cooling jacket 6, and accommodates the stepped portion 6J at the end of the inner peripheral wall 6C of the cooling jacket 6. As shown in FIG. 5, the annular portion 10B may be engaged with the base plate 8 by a pin protrusion 10E.

  As shown in FIG. 5, the end portions of the inner and outer peripheral walls 6B and 6C of the cooling jacket 6 are annularly formed with stepped 6J and 6K on the inner peripheral side, respectively, and the outer peripheral side stepped 8D of the base plate 8 and the adapter 10 annular protrusions 10D are configured to be engaged in a fitted state.

  The base plate 8, the adapter 10, and the cooling jacket 6 having the above configuration are assembled as shown below. First, the base plate 8 is positioned and arranged at the end of the stator core 5, and the stator coil 7 including the base plate 8 is wound in the slot 5A in a state where the insulating sheet 9 is arranged on the inner wall surface of the slot 5A. Is wound so as to be located outside the base plate 8. The wound coil end 7A has a contour shape that expands radially outward as it moves away from the opening of the slot 8A in the axial direction. Here, if necessary, the outer contour of the coil end 7A is formed, and the coil end 7A is heat-cured after impregnation with the insulating varnish. In this state, the base plate 8 is integrated with the stator core 5 by the coil 7.

  Next, as shown in FIG. 6, the adapter 10 is inserted into and engaged with the slot opening 5C, 8C of the base plate 8 and the stator core. In FIG. 6, illustration of the coil end 7 </ b> A and the base plate 8 is omitted, so that only the relationship between the stator core 5 and the adapter 10 is clarified. The upper adapter 10 in the figure shows the one in the middle of attachment, and the lower adapter 10 in the figure shows the one in which the attachment is completed. In the adapter 10 that has been mounted, as shown in FIG. 5, the annular portion 10 </ b> B comes into contact with the inner peripheral side of the base plate 8, and axial positioning with respect to the stator core 5 is performed. In this way, the adapter 10 is sequentially attached and engaged with the entire circumference of the base plate 8 and the inner circumference of the stator core 5. In the illustrated state, the adapter 10 is described as being inserted from one end of the stator core 5 over the entire length of the stator core 5, but the adapter 10 may be inserted from both sides of the stator core 5.

  In a state where the adapter 10 is engaged with the entire inner periphery of the base plate 8, the radially inner peripheral side of the coil 7 in the slot 8 </ b> A of the base plate 8 and the slot 5 </ b> A of the stator core 5 is the base plate 8 and the stator core 5. The seal openings 10A of the adapter 10 inserted in the slot openings 5C and 8C are supported in contact with the radially outer peripheral side. Further, the annular protrusion 10D of the adapter 10 is continuously arranged on the entire circumference. Here, if necessary, a liquid sealability of the slot openings 5C and 8C can be improved by impregnating a gap between the slot openings 5C and 8C and the seal portion 10A with a sealant or the like.

  Next, as shown in FIG. 5, the cooling jacket 6 accommodates the coil ends 7A between the inner and outer peripheral walls 6B and 6C, and the stepped portions 6J and 6K at the ends of the inner and outer peripheral walls 6B and 6C are placed on the outer periphery of the base plate 8. It can be assembled by fitting the stepped 8D and the annular projection 10D of the adapter 10 respectively. Also here, if each fitting portion between the cooling jacket 6 and the base plate 8 and the adapter 10 is impregnated with a sealant or the like, the liquid tightness around the cooling jacket 6 can be improved.

  Each cooling jacket 6 is prevented from being detached in the axial direction by the side plates 2 </ b> B and 2 </ b> C of the case 2. The engagement of the seal portion 10A with the slot openings 5C and 8C closes the base plate 8 and the slot openings 5A and 8A of the stator core to form a cooling passage communicating with the space inside the cooling jacket 6.

  In the cooling structure of the motor generator configured as described above, when cooling oil is supplied into the cooling jacket 6 from each oil supply port 6D, the cooling oil passes through the gap between the coil end 7A and the cooling jacket 6 in the cooling jacket 6. Then, it flows toward the upper side of the cooling jacket 6. The cooling oil cools the coil end 7A by heat exchange with the coil end 7A, and the temperature rises. Therefore, the temperature of the cooling oil rises as it flows upward in the cooling jacket 6, and is returned from the oil discharge port 6 </ b> E at the upper end of the cooling jacket 6 to the oil tank via the oil cooler via a pipe (not shown). Since the cooling oil flows upward while raising the temperature in the cooling jacket 6, the density becomes smaller and lighter as the density moves upward, so that the upward flow is accelerated with buoyancy. For this reason, it can flow without producing a stagnation etc. in the flow of the cooling oil in the cooling jacket 6.

  The cooling oil flowing through the cooling jacket 6 also flows into the slot 5A and cools the stator coil 7 accommodated in the slot 5A. The cooling oil whose temperature has risen in the slot 5A flows out into the cooling jacket 6, and new cooling oil flows in instead. In order to promote the inflow and outflow of the cooling oil into the slot 5A, the internal pressure in one of the cooling jackets 6 is set, for example, a back pressure valve or the like is arranged at the cooling oil outlet 6E to cool the other. By maintaining the jacket 6 higher than that, the cooling oil can flow into the slot 5A from one cooling jacket 6 and the cooling oil in the slot 5A can flow out into the other cooling jacket 6. Thus, the stator coil 7 incorporated in the slot 5A can be cooled.

  Further, since the oil supply port 6D at the lower part of the cooling jacket 6 is arranged in the axial direction, the cooling oil jetted into the cooling jacket 6 collides with the coil end 7A and the inner and outer peripheral sides of the coil end 7A. The remaining cooling oil flows through the gap on the side of the coil end 7 </ b> A and flows through the gap toward the upper side of the cooling jacket 6. Accordingly, a uniform flow rate is ensured in these gaps and the cooling oil flows, and the coil end 7A can be effectively cooled.

  Further, since the cooling jacket 6 is sandwiched between the end of the stator core 5 and the case side plates 2B and 2C and fitted to the inner surfaces of the case side plates 2B and 2C, the outer diameter of the case cylindrical portion 2A is large. Thus, a small motor generator 1 can be obtained.

  Furthermore, the base plate 8 includes the base plate 8 in a state where the stator coil 7 is positioned and arranged at the end of the stator core 5 before the stator coil 7 is wound around the teeth 5B between the slots 5A of the stator core 5. 5A is wound so that the coil end 7A is positioned outside the base plate 8. By adopting this base plate 8 in place of the conventional insulating plate, the conventional motor manufacturing process is not changed. The base plate 8 can be fixed using the conventional manufacturing process as it is.

  Further, since the slot openings 5C and 8C of the base plate 8 and the stator core are closed by the seal portion 10A of the adapter 10, the space in the cooling jacket 6 and the spaces of the slot spaces 5A and 8A of the stator core 5 and the base plate 8 are communicated. The For this reason, it is possible to prevent the cooling oil in the cooling jacket 6 from leaking to the rotor 3 side.

  Further, the end portions of the inner and outer peripheral walls 6B and 6C of the cooling jacket 6, the outer peripheral end of the base plate 8 and the annular portion 10B of the adapter 10 are formed in stepped 6J, 6K, 8H and 10D which are engaged with each other in a fitted state. Therefore, it is possible to prevent the cooling oil in the cooling jacket 6 from leaking from the engagement portion between the two. And since both are fitting by step 6J, 6K, 8H, 10D, the part which protrudes in the cooling jacket 6 is not required, but a dimension can be formed thinly in a radial direction, and it is that much. The volume can be expanded in the radial direction, and positioning of the cooling jacket 6 and the base plate 8 can be performed without affecting the motor performance such as reducing the line product ratio of the coil 7.

  In addition, since the inner peripheral wall 6C of the cooling jacket 6 is fitted to the outer peripheral side of the annular portion 10B of the adapter 10 by the step 6J, the cooling jacket 6 is flown when the cooling oil flows into the cooling jacket 6. Even if the inner peripheral wall 6C is elastically deformed by the pressure of the cooling oil generated inside, the protrusion to the rotor 3 side can be suppressed and interference with the rotor 3 can be prevented.

  7 to 9 show the adapter of the second embodiment, FIG. 7 is a partial sectional view of the stator core by the adapter of the second embodiment, and FIG. 8 is a detailed view showing the shape of the adapter of the second embodiment. 9 is a perspective view showing an attachment procedure of the adapter of the second embodiment. The adapter of the second embodiment is obtained by separating the extension portion of the adapter of the first embodiment from the seal portion. 1 to 6 are denoted by the same reference numerals, and description thereof is omitted or simplified.

  The adapter 20 of the present embodiment is similar to the adapter 10 of the first embodiment in that the seal portion 10A is inserted into the opening slit 8C of the slot 8A in the base plate 8 and the opening slit 5C of the slot 5A opened to the inner peripheral side of the stator core 5. And an annular portion 10B that connects the end portions of the seal portion 10A. The seal portion 10A has substantially the same cross-sectional shape as the narrow portion 11 at the opening end of the slot openings 5C and 8C and a part of the enlarged portion 12 connected to the narrow portion 11, and after the stator coil 7 is wound, the opening slit 5C. , 8C, the both sides engage with the opposing surfaces of the teeth portion 5B constituting the narrow portion 11 and the enlarged portion 12 connected thereto. The extension portion 10C formed integrally with the seal portion 10A of the adapter 10 of the first embodiment is formed separately from the seal portion 10A, and is formed integrally with a connecting portion 10E that connects the bases of the extension portion 10C. The insulating part 15 is configured. The insulating portion 15 surrounds the stator coil 7 from the inner peripheral side of the slots 5A and 8A and exhibits an insulating function between the tooth portion 5B and the coil 7. The seal portion 10A engages with the slot openings 5C and 8C and supports the insulating portion 15 including the extension portion 10C and the connecting portion 10E from the inner peripheral side.

  In the present embodiment, the following effects can be achieved.

  (A) A cylindrical stator core 5 provided with a plurality of slots 5A for accommodating the stator coil 7 and provided with openings 5C of the slots 5A on the inner peripheral surface, and a blockage for closing the openings 5C of the plurality of slots 5A of the stator core 5 A member (10A) is attached to the front end and the rear end of the stator core 5 in a liquid-tight manner, and surrounds the coil ends 7A of the stator coil 7 projecting from the front end and the rear end of the stator core 5 to form a liquid-tight annular space. Cooling medium 6 is formed, and a cooling medium is introduced into and discharged from a space that accommodates the stator coil 7 that is provided in the cooling jacket 6 and defined by the stator core 5, the closing member 10 </ b> A, and the cooling jacket 6. A cooling structure for a motor generator comprising a cooling medium inlet 6D and an outlet 6E for each of the plurality of slots 5A. At the end of the opening 5C, the teeth portions 5B on both sides are expanded in the circumferential direction to form a narrow portion 11 and an enlarged portion 12 to the slot 5A, and the closing member (10A) is the narrow portion of the slot 5A opening 5C. The seal member 10 </ b> A is inserted in the axial direction from the front end and / or the rear end of the stator core 5 in contact with the enlarged portion 12 from 11 to the slot 5 </ b> A. For this reason, it is possible to easily obtain a cooling structure for a motor generator without requiring filling of a resin material that requires a core or a mold or a manufacturing process of detaching the core and the mold from the stator core. it can.

  (A) Since the stator coil 7 housed in the slot 5A is positioned directly or indirectly by the back surface of the sealing member 10A as the closing member, the position of the stator coil 7 in the slot 5A is stabilized without variation. Thus, it is possible to increase the amount of coil to be wound by enlarging the cross-sectional area occupied by the coil in the slot 5A, thereby improving the performance of the motor generator.

  (C) Since the sealing member 10A as the closing member is connected to each other by the annular member 10B at the front end and / or the rear end of the stator core 5, the axial positioning of the sealing member 10A is facilitated.

  (D) The annular member 10B of the closing member is formed into a divided piece including a plurality of seal members 10A and an annular member 10B that connects them, and the plurality of the divided pieces are arranged over the entire inner circumference side of the stator core 5. Compared to the case where the seal member 10A is integrally connected to the entire circumference and inserted into the opening 5C of the slot 5A at the same time for insertion, the workability of inserting the seal member 10A into the slot opening 5C is improved. improves.

  (E) At the front end and the rear end of the stator core 5, the slot 8 </ b> A is provided in the same manner as the yoke constituting the stator core 5, and the base plate 8 is fixed to the stator core 5 by winding the stator coil 7. The seal member 10A is inserted in the axial direction in contact with the enlarged portion from the narrow portion of the slot opening 8C of the base plate 8 to the slot, and the annular member 10B of the closing member is disposed in contact with the base plate 8, The base plate 8 can be fixed using the conventional manufacturing process as it is without changing the conventional motor manufacturing process, and the cooling oil in the cooling jacket 6 can be prevented from leaking to the rotor 3 side.

  (F) The cooling jacket 6 is positioned by engaging its end on the stator core 5 side with the base plate 8 and the annular member 10B of the closing member, so that the end of the cooling jacket 6 is directly connected to the base plate 8 and the adapter 10. In addition, positioning can be performed without requiring extra space on the inner and outer circumferences, and the motor generator 1 can be reduced in size. Further, by engaging the both, the structure can be simplified and the number of work steps can be reduced.

(Second Embodiment)
10 to 17 show a second embodiment of a motor generator cooling structure to which the present invention is applied. FIG. 10 is a perspective view of the cooling structure. FIG. 11 is a cross-sectional view taken along line AA of FIG. 12 is a sectional view taken along line BB in FIG. 10, FIG. 13 is a partially enlarged view of FIG. 12, FIG. 14 is a sectional view of the spacer, FIGS. 15 to 16 are perspective views of the spacer, and FIG. It is explanatory drawing demonstrated. In the present embodiment, a sealing structure for a lead wire that is a terminal portion of the stator coil and is led out through the cooling jacket is added to the cooling structure of the first embodiment. The same devices and parts as those in FIGS. 1 to 9 are denoted by the same reference numerals, and description thereof will be omitted or simplified.

  In the cooling structure of the present embodiment, three slits 20 extending in the axial direction are formed in the outer peripheral wall 6B of the upper end portion (in a state where the motor generator is installed) of the annular cooling jacket 6 having a U-shaped cross section. Then, using the spacers 21 and 22 fitted into the three slits 20, respectively, the lead wires 23U, 23V, and 23W from the U phase, V phase, and W phase are configured to penetrate. Since the slit 20 that penetrates the lead wire 23 (U, V, W) is provided on the outer peripheral wall 6B of the upper end portion of the cooling jacket 6, it is the upper end of the cooling oil container constituted by the cooling jacket 6; Leakage of cooling oil can be suppressed without requiring a seal structure.

  The slit 20 is opened in the axial direction from a portion close to the bottom wall 6A of the outer peripheral wall 6B of the cooling jacket 6 to an end surface in contact with the base plate 8, and opposing edges 20A of the slit 20 are as shown in FIGS. In addition, the inner surface of the cooling jacket 6 is notched obliquely and thinned at the tip side.

  As shown in FIGS. 15 and 16, the spacers 21 and 22 include a back side spacer 21 that fits in the back side of the slit 20 and a front side spacer 22 that fits in the front side of the slit 20. The lead wire 23 (U, V, W) is sandwiched between the spacers 21 and 22. Grooves 21A and 22A are formed on the edges of the spacers 21 and 22 to be engaged with the opposing edges 20A of the slit 20, and the grooves 21A and 22A and the edge 20A of the slit 20 are fitted to each spacer 21 and 22A. 22 is assembled to the cooling jacket 6. The rear spacer 21 and the front spacer 22 are formed with holes 21B and 22B that allow the lead wires 23 (U, V, and W) to pass therethrough, and to the holes 21B and 22B and the edge 21A of the slit 20. The pair of connecting portions 21C and 22C between the engaging grooves 21A and 22A can be coupled. The connecting portions 21C and 22C are configured such that one is a recess (22C) and the other is a protrusion (21C) so that they can be engaged with each other. As shown in FIGS. 12 to 14, the holes 21 </ b> B and 22 </ b> B through which the lead wires 23 (U, V, W) penetrate are formed so that the lead wires 23 (U, V, W) can be obliquely penetrated. .

  In the cooling structure having the above configuration, as shown in FIG. 17, the back spacer 21 is fitted to each slit 20 of the cooling jacket 6, and then the lead wire 23 (U, V) composed of the U phase to the W phase. , W) are respectively inserted into the slits 20 and engaged with the holes 21B (half holes) of the rear spacer 21, and then the front spacers 22 are fitted into the slits 20 to By connecting, each lead wire 23 (U, V, W) can be disposed through the cooling jacket 6. Next, by engaging the end portion of the cooling jacket 6 with the base plate 8 and the adapter 10, the spacers 21 and 22 are prevented from coming off. Then, a sealant is poured into gaps such as engagement portions between the spacers 21 and 22 and the slit 20 of the cooling jacket 6 and engagement portions between the spacers 21 and 22 and the lead wires 23 (U, V, W). Completed by plugging.

  The fitting state between the grooves 21A and 22A of the spacers 21 and 22 and the edge 20A of the slit 20 improves the sealing performance if closely fitted, but the lead wire 23 (U, V, W) There is a risk that assembly will be difficult due to limited movement. Therefore, if the fitting state between the grooves 21A and 22A of the spacers 21 and 22 and the edge 21A of the slit 20 is fitted with a slight clearance S as shown in FIG. The lead wire 23 (U, V, W) can move slightly following the movement and direction. In the final assembly state, the gaps between the engagement portions between the spacers 21 and 22 and the slit 20 of the cooling jacket 6, the engagement portions between the spacers 21 and 22 and the lead wires 23 (U, V, W), and the like. It is completed by pouring a sealant into and closing the gap.

  In the present embodiment, in addition to the effects (a) to (f) in the first embodiment, the following effects can be achieved.

  (G) The lead wire 23 (U, V, W) of the stator coil 7 is pulled out of the cooling jacket 6 by providing an axial slit 20 on the outer peripheral wall 6B of the cooling jacket 6, and the slit 20 has a peripheral portion. Similar to the back spacer 21 to be engaged and inserted, a front spacer 22 to be inserted with the peripheral edge engaged with the slit 20 is provided, and the lead is inserted into the through holes 21B and 22B provided between the spacers 21 and 22. In order to pass the wires 23 (U, V, W), the lead wires 23 (U, V, W) can be drawn to the outside while maintaining liquid tightness.

  (H) The slit 20 and the peripheral portions of the spacers 21 and 22 are engaged with the outer peripheral wall 6B of the cooling jacket 6 because the spacers 21 and 22 are engaged with a clearance allowing radial movement. The spacers 21 and 22 move following the flexible movement of the lead wires 23 (U, V, W) to facilitate wiring work and assembly work.

The schematic diagram of the cooling structure of the motor generator which shows one embodiment of the present invention. The partial perspective view of a stator core and a base plate similarly. The fragmentary sectional view of the stator core containing the adapter in 1st Example. Front view (A), left side view (B), right side view (C), cross-sectional view along line DD (D), and E of the divided piece of the first embodiment of the adapter Sectional drawing along the -E line (E). The schematic sectional drawing of a cooling structure. The perspective view which shows the attachment point of the adapter of 1st Example. The fragmentary sectional view of the stator core containing the adapter in 2nd Example. Front view (A), left side view (B), right side view (C), cross-sectional view along line DD (D), and E of the divided piece of the second embodiment of the adapter Sectional drawing along the -E line (E). The perspective view which shows the attachment point of the adapter of 2nd Example. The perspective view of the cooling structure of the motor generator which shows 2nd Embodiment of this invention. Sectional drawing which follows the AA line of FIG. Sectional drawing which follows the BB line of FIG. FIG. 13 is a partially enlarged view of FIG. 12. Sectional drawing of a spacer. The perspective view of the spacer of a division | segmentation state. The perspective view of the spacer of a connection state. Explanatory drawing explaining an assembly state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor generator 2 Case 3 Rotor 5 Stator core 6 Cooling jacket 7 Stator coil 8 Base plate 10 Adapter

Claims (8)

A cylindrical stator core having a plurality of slots for accommodating the stator coils, with openings of the slots provided on the inner peripheral surface, a closing member for closing the openings of the plurality of slots of the stator core, and a front end and a rear end of the stator core A cooling jacket that is attached in a liquid-tight manner and surrounds the coil ends of the stator coils that protrude from the front end and the rear end of the stator core, respectively, and a liquid-tight annular space is formed. The cooling jacket is provided in the cooling jacket. A cooling structure for a motor generator comprising an inlet and an outlet for the cooling medium for introducing and discharging the cooling medium to and from the space for housing the stator coil defined by the cooling jacket,
At each open end of the plurality of slots, the teeth on both sides bulge in the circumferential direction to form a narrow portion and an enlarged portion to the slot,
The motor generator is characterized in that the closing member is formed by a seal member inserted in an axial direction from the front end and / or rear end of the stator core in contact with the enlarged portion from the narrow portion to the slot of the slot opening. Cooling structure.   The motor generator cooling structure according to claim 1, wherein the stator coil housed in the slot is positioned directly or indirectly by a back surface of the sealing member of the closing member.   The motor generator cooling structure according to claim 1, wherein the sealing member of the closing member is connected to each other by an annular member at a front end and / or a rear end of the stator core.   The annular member of the closing member is formed into a divided piece including a plurality of seal members and an annular member that connects them, and a plurality of the divided pieces are mounted so as to extend over the entire inner circumference of the stator core. The motor generator cooling structure according to claim 3. The front and rear ends of the stator core are provided with slots similar to the yoke constituting the stator core, and are provided with a base plate fixed to the stator core by winding of the stator coil,
The sealing member of the closing member is inserted in an axial direction in contact with an enlarged portion from a narrow portion of the slot opening of the base plate to the slot, and the annular member of the closing member is disposed in contact with the base plate. The motor generator cooling structure according to claim 3 or 4.   6. The motor generator cooling structure according to claim 5, wherein the cooling jacket is positioned by engaging an end of the stator core side with the base plate and an annular member of the closing member.   The lead wire of the stator coil is pulled out of the cooling jacket by providing an axial slit on the outer peripheral wall of the cooling jacket, and inserting the peripheral edge into the slit with the peripheral edge engaged with the slit. The front side spacer to be engaged and inserted is provided, and the lead wire is passed through a through hole provided between the spacers. Motor generator cooling structure.   8. The motor according to claim 7, wherein the engagement between the slit and the peripheral edge of the spacer is such that the spacer is engaged with a wall surface of the outer peripheral wall of the cooling jacket with a clearance that allows radial movement. Generator cooling structure.

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