JP2005348594A - Cooling structure for motor generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling structure for a motor generator which can be made compact. <P>SOLUTION: The cooling structure for a motor generator 1 is provided with a cooling jacket 6 in which a coil 7 is stored in a slot 5A of a stator core 5, the inside of the slot 5A is formed into a refrigerant passage by closing an opening 5C of the slot 5A formed at the inner peripheral face of the stator core 5, and liquid-tight annular spaces are formed to the front end and the rear end of the stator core 5 so as to surround coil ends 7A which protrude from the ends. Base plates 8 are fixed and arranged to the front end and the rear end of the stator core 5, respectively, and positioning is executed by making the side end of the stator core 5 of the cooling jacket 6 engage with the base plate 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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).

This forms an annular space that accommodates the coil end by contacting the inner and outer peripheral end surfaces of the cooling jacket in a ring shape with seals interposed between the stator coil inner peripheral surface and the stator coil outer peripheral side of the stator core end surface.
Japanese Patent No. 2716286

  However, in the above conventional example, a flange that extends radially outward is provided at the outer peripheral side end portion that contacts the stator core of the cooling jacket, and this flange is fixed to the stepped portion provided in the case cylindrical portion with a bolt. There is a problem that it is difficult to reduce the outer diameter of the cylindrical portion of the case, which requires a space for the work and a work space for the bolt fastening work.

  Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide a motor generator cooling structure that can be reduced in size.

  The present invention is a cooling structure for a motor generator including a cooling jacket that forms a liquid-tight annular space surrounding a coil end projecting from each end portion at a front end and a rear end of a stator core. The base plate was fixedly disposed at each end, and the stator core side end portion of the cooling jacket was engaged with the base plate for positioning.

  Therefore, according to the present invention, there is provided a cooling structure for a motor generator including a cooling jacket that forms a liquid-tight annular space surrounding the coil ends protruding from the respective ends at the front end and the rear end of the stator core. The base plate is fixedly disposed at the rear end, and the stator core side end portion of the cooling jacket is engaged with the base plate for positioning. Therefore, the end portion of the cooling jacket is directly engaged with the base plate, and positioning can be performed without requiring an extra space on the inner and outer circumferences, and the motor generator can be reduced in size. Moreover, since it only engages, a structure can be simplified and an operation man-hour can also be reduced.

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

(First embodiment)
1 to 6 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 sectional view of a cooling structure including a stator core. 3 is a plan view showing the shape of the base plate, FIG. 4 is a partial perspective view of the stator core including the base plate, FIG. 5 is a partial perspective view of the cooling jacket, and FIG. 6 is a cross-sectional view showing a mounting state of the cooling structure.

  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 surface of the case cylindrical portion 2A. The end portions of the outer peripheral wall 6B and the inner peripheral wall 6C are in contact with the end surface of the stator core 5 with a seal interposed therebetween.

  As shown in FIG. 2, the bottom wall 6A of the portion of the cooling jacket 6 positioned below in the case 2 is provided with an oil supply port 6D through the case side plates 2B and 2C. Oil is supplied into the cooling jacket 6 through the oil supply port 6D. 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. The outer peripheral wall 6B on the upper end side of the case 1 of the cooling jacket 6 is provided with an oil discharge port 6E provided through the case cylindrical portion 2A, and the cooling oil is discharged to the outside from the oil discharge port 6E. ing.

  Although not shown, the stator core 5 is provided with a slot 5A that accommodates a stator coil 7 wound around a tooth portion 5B. The slit opening 5C on the inner peripheral side of the stator core 5 in the slot 5A is closed with resin or the like, so that the cooling oil is supplied to the rotor. The space formed by the slot 5A constitutes a cooling passage that accommodates 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.

  As shown in FIGS. 3 and 4, 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. In other words, the base plate 8 has substantially the same inner and outer diameters as the stator core 5 and is provided with a slot 8A having substantially the same shape as the yoke constituting the stator core 5, and is made of a thick plate electrical insulating material. The base plate 8 is provided with positioning grooves 8B on the outer periphery in order to align with the slots 5A, and by engaging the positioning grooves 8B with positioning keys 9 engaged with positioning grooves 5D provided on the outer periphery of the stator core 5, the stator core 5 The slots 8A are arranged at the both ends of the slot. On the outer periphery of the base plate 8, an edge 8 </ b> C that protrudes in an annular shape in the axial direction and engages with an end portion of the outer peripheral wall 6 </ b> B of the cooling jacket 6 is provided. Further, the inner peripheral side closest to the edge 8C is provided with engaging recesses 8D at a plurality of positions spaced in the circumferential direction, and the inner peripheral side also has engagement holes at a plurality of positions spaced in the circumferential direction. 8E 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 an insulating sheet (not shown) is arranged on the inner wall surface of the slot 5A. Then, 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 7 </ b> A of the stator coil 7 is wound around the adjacent slot 5 </ b> A by changing the direction from one slot 5 </ b> A 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 slot opening 8A 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 utilize the conventional manufacturing processes (coil inserting process into slot, coil winding process, coil end forming process) as it is without changing the conventional motor manufacturing process.

  The stator on which the stator coil 7 is wound is sealed by molding a thermosetting resin in the opening slit 5C of the slot 5A that opens to the inner peripheral side of the stator core 5 including the opening slit of the slot 8A in the base plate 8. At the time of resin molding, it is desirable to arrange a core material that engages with the opposing wall surface of the opening slit 5C so that the mold resin does not flow into the stator coil 7 side. In this way, each slot 5A is formed in a cooling passage that allows both ends of the stator core 5 to communicate with each other while the stator coil 7 is accommodated.

  As shown in FIG. 5, the cooling jacket 6 includes inner and outer peripheral walls 6B and 6C and a bottom wall 6A, and is formed in a U-shaped cross section with one end opened. The end portions of the outer peripheral wall 6B are provided with engaging projections 6F at a plurality of locations spaced in the circumferential direction, and the end portions of the inner peripheral wall 6C are provided with engagement holes 6G at a plurality of locations spaced in the circumferential direction. Is provided. These engagement protrusions 6F and engagement holes 6G are formed with the engagement recesses 8D and the engagement holes 8E of the base plate 8 when the ends of the outer peripheral wall 6B of the cooling jacket 6 are engaged with the inner surface of the edge 8C of the base plate 8. It arrange | positions so that it may be located in the same position.

  Therefore, when the engagement pin 10 is inserted into the engagement hole 6G and the cooling jacket 6 is aligned with the base plate 8 while being engaged with the inner surface of the edge 8C of the base plate 8, the engagement protrusion 6F of the cooling jacket 6 is moved to the base plate. The engagement pin 10 fitted into the engagement hole 8G of the base plate 8 is cooled by being fitted into the engagement hole 8E of the base plate 8. The jacket 6 can be attached to the base plate 8 at a preset position. Prior to the engagement, a sealing agent is applied to the joint surfaces of the two, and the annular space in the cooling jacket 6 is sealed when the two are engaged. In the assembled state of the stator assembly and the cooling jacket 6, the cooling jacket 6 is fixed to the base plate 8 by fixing means (not shown).

  The oil supply port 6D is formed so as to protrude from the bottom wall 6A of the cooling jacket 6 toward the case side plates 2B and 2C, and includes an annular groove 6H into which the seal ring 11 is fitted. As shown in FIG. 6, the case side plates 2B and 2C have a supply port 12 that is engaged with the oil supply port 6D in the axial direction. The supply port 12 is provided in the case side plates 2B and 2C. Via a supply valve or the like to a cooling oil supply pump (not shown). In FIG. 6, the outer peripheral wall 6B of the cooling jacket 6 is shown to be positioned and held by fitting to the inner wall surfaces of the case side plates 2B and 2C.

  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, the oil supply port 6D at the lower part of the cooling jacket 6 is arranged in the axial direction so as to be fitted in the axial direction with the oil passages 12 and 13 provided in the case side plates 2B and 2C. Is fitted to the inner surface of the case cylindrical portion 2A, the end surface thereof is brought into contact with the end surface of the stator core 5, and the oil supply port 6D and the supply passages 12, 13 are simply assembled to the side surfaces of the case side plates 2B, 2C. As a result, the assembly workability can be improved and the productivity can be improved.

  Further, since the cooling jacket 6 is sandwiched between the end portion of the stator core 5 and the case side plates 2B and 2C and fitted to the inner surface of the case cylindrical portion 2A to be positioned and held, the outer diameter of the case cylindrical portion 2A is increased. 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.

  The base plate 8 has engagement recesses 6F provided on the end surfaces of the inner and outer peripheral walls 6B and 6C of the cooling jacket 6 when the end of the outer peripheral wall 6B of the cooling jacket 6 is engaged with the inner surface of the edge 8C of the base plate 8. The engaging recess 8D and the engaging hole 8E are arranged so as to be located at the same position as the engaging hole 6G. Therefore, the engagement protrusion 6F of the cooling jacket 6 is fitted into the engagement recess 8D of the base plate 8 and is prevented from coming off at the engagement portion, and the engagement pin 10 inserted into the engagement hole 6G of the cooling jacket 6 is By fitting into the engagement hole 8E, the cooling jacket 6 can be easily attached and fixed to the base plate 8 at a preset position. Moreover, since the cooling jacket 6 is positioned and held by fitting the outer peripheral walls 6B and 6C to the inner surface of the case cylindrical portion 2A and the bottom wall 6A abutting against the case side plates 2B and 2C, it can be detached from the base plate 8. In addition, the joining structure of the base plate 8 and the cooling jacket 6 can be simplified.

  In the above embodiment, the slot 5A that accommodates the stator coil 7 wound around the tooth portion 5B is provided, and the slit opening 5C on the inner peripheral side of the stator core 5 of the slot 5A is closed with resin or the like so that the cooling oil is on the rotor 3 side. In the above description, the space formed by the slot 5A accommodates the stator coil 7 and constitutes a cooling passage that allows the left and right cooling jackets 6 to communicate with each other. The cooling oil may be circulated only in the cooling jacket without providing a passage. In that case, it is not necessary to block the slit opening 5C with resin.

  In such a configuration, the varnish is formed in the gap between the slot and the wound coil when the line factor of the coil into the slot is increased and it becomes difficult for the cooling oil to flow into the slot from the inside of the cooling jacket. So as to stop the cooling oil from entering the slot. Cooling oil is prevented from leaking by filling or the like in the radially inner opening of the base plate slot 8A. Such a configuration is particularly effective when the axial dimension of the stator core is relatively short because heat generated in the coil is transferred to the coil end in a short time.

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

  (A) The cooling structure of the motor generator 1 includes a cooling jacket 6 that surrounds the coil ends 7A protruding from the respective ends at the front end and the rear end of the stator core 5 to form a liquid-tight annular space. The base plate 8 is fixedly disposed at the front end and the rear end, respectively, and the end portion of the cooling jacket 6 on the side of the stator core 5 is engaged with the base plate 8 for positioning. Therefore, the end portion of the cooling jacket 6 is directly engaged with the base plate 8 and can be positioned without requiring an extra space on the inner and outer periphery thereof, and the motor generator 1 can be reduced in size. Further, by engaging, the structure can be simplified and the number of work steps can be reduced.

  (A) Since the cooling jacket 6 is held with its outer peripheral wall 6B in contact with the inner surface of the case cylindrical portion 2A and its bottom wall 6A in contact with the case side plates 2B and 2C, it is not detached from the base plate 8. Can be held.

  (C) Since the base plate 8 is fixed to the stator core 5 by the stator coil 7 by winding the stator coil 7 in a state where the base plate 8 is arranged at both ends of the stator core 5, the conventional base plate 8 can be used without changing the conventional motor manufacturing process. The base plate 8 can be fixed using the manufacturing process as it is.

  (D) Since the base plate 8 includes the slot 8A like the yoke constituting the stator core 5, the base plate 8 can be fixed using the conventional manufacturing process as it is without changing the conventional motor manufacturing process.

(Second Embodiment)
7 to 11 show a second embodiment of the cooling structure of the motor generator to which the present invention is applied. FIG. 7 is a sectional view of the cooling structure, FIG. 8 is an enlarged sectional view of the mounted state, and FIG. 9 is the shape of the adapter. FIG. 10 is a perspective view showing how to attach the adapter, and FIG. 11 is a perspective view showing how to attach the cooling jacket to the adapter. In this embodiment, a cooling jacket is attached to the base plate via an adapter. 1 to 6 are denoted by the same reference numerals, and description thereof is omitted or simplified.

  In the motor generator cooling structure of the present embodiment, as shown in FIG. 7, an adapter 15 is provided to be engaged with the inner peripheral side of the base plate 8, and the end of the inner peripheral wall 6 </ b> C of the cooling jacket 6 is engaged with this adapter 15. I try to match.

  As shown in FIGS. 8 and 9, the adapter 15 includes an engaging portion 15A that engages with the base plate 8, a protrusion 15B that engages with an opening 8F radially inward of the slot 8A of the base plate 8, And an annular protrusion 15 </ b> C that engages with an end of the inner peripheral wall 6 </ b> C of the cooling jacket 6. As shown in detail in FIG. 9, the adapter 15 is divided into a plurality of parts in the circumferential direction, and the divided adapters 15 are engaged with the inner peripheral side of the base plate 8 by the engaging portions 15A. The base plate 8 is used in a state of being engaged with the entire circumference on the inner circumference side. The adapter 15 shown in FIG. 9 shows a front view, left and right side views, and a cross-sectional view taken along lines DD and EE of a part of the divided pieces. In the adapter 15 shown in FIG. 9, four engaging portions 15A and projections 15B are alternately connected to each other, and an annular projection 15C is provided on the back side.

  As shown in FIG. 9C, the engaging portion 15A of the adapter 15 has a shape similar to the shape of the tip portion overlapping the teeth portion 5B on the inner peripheral side of the base plate 8, as seen from the right side surface. The pieces are connected by an annular protrusion 15C on the back and an adjacent protrusion 15B. An engagement pin 16 that engages with an engagement hole 8G provided in the base plate 8 is provided at the central portion of each engagement portion 15A.

  The protrusion 15B engages with the radially inward opening 8F of the slot 8A of the base plate 8. The protrusion 15B is disposed between the engagement parts 15A and is adjacent to the annular protrusion 15C on the back and the adjacent engagement. They are connected by the part 15A. The protruding portion 15B is also formed by a columnar member 17 protruding in the same direction as the engaging pin 16 of the engaging portion 15A, and the columnar member 17 is inserted between the opposing side surfaces of the slot opening 8F of the base plate 8. In addition, the outer side in the radial direction of the columnar member 17 (the side on which the coil 7 is disposed when the adapter 15 is attached to the entire circumference of the base plate 8) is in contact with the coil 7 that is insulated by the insulating sheet 18. The coil 7 is supported from the inside in the radial direction. Further, the radially inner side of the columnar member 17 faces the outer periphery of the rotor 3.

  The annular protrusion 15 </ b> C is formed so as to protrude in a cylindrical shape in the direction opposite to the engagement pin 16 and the columnar member 17 inward in the radial direction. The annular protrusion 15 </ b> C is fitted to the end portion of the inner peripheral wall 6 </ b> C of the cooling jacket 6 from the outer peripheral side, and accommodates the end portion of the inner peripheral wall 6 </ b> C of the cooling jacket 6.

  On the inner peripheral side of the base plate 8, engaging holes 8G for receiving the engaging pins 16 arranged in the engaging portions 15A of the adapter 15 are provided on the inner peripheral end side between the slot openings 8F. Further, the outer peripheral side of the base plate 8 is formed in a stepped 8H that fits with the end of the outer peripheral wall 6B of the cooling jacket 6.

  As shown in FIG. 7, the end portions of the inner and outer peripheral walls 6B and 6C of the cooling jacket 6 are formed into annular steps 6J and 6K on the inner peripheral side, respectively. It is configured to engage with 15 annular protrusions 15C in a fitted state.

  The base plate 8, the adapter 15, 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 with the insulating sheet 18 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 cooling jacket 6 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. 10, the adapter 15 is engaged with the inner peripheral side of the base plate 8 using the engaging portion 15A. The engagement is performed by inserting the engaging pin 16 of the engaging portion 15 </ b> A into the engaging hole 8 </ b> G of the base plate 8 while inserting the columnar member 17 of the protruding portion 15 </ b> B into the slit opening 8 </ b> F of the base plate 8. In FIG. 10, the illustration of the coil end 7A is omitted so that only the relationship between the base plate 8 and the adapter 15 is clarified. The lower adapter 15 in the figure shows the one in the middle of attachment, and the upper adapter 15 in the figure shows the one in which the attachment has been completed. In the adapter 15 that has been installed, the engaging pin 16 of the engaging portion 15A is not clearly shown in the drawing, but is engaged with the engaging hole 8G of the base plate 8, and the columnar member 17 of the protruding portion 15B is the base plate. The state of being inserted into the eight slot openings 8F is clearly shown. In this way, the adapter 15 is sequentially attached and engaged with the entire circumference of the inner peripheral portion of the base plate 8.

  In a state where the adapter 15 is engaged with the entire inner periphery of the base plate 8, the radially inner peripheral side of the coil 7 that passes through the slot 8 </ b> A of the base plate 8 is inserted into the slot opening 8 </ b> F of the base plate 8. The columnar member 17 of the adapter 15 is supported in contact with the outer peripheral side in the radial direction via an insulating sheet 18. Further, in the portion of the coil 7 exposed from the slot 8A of the base plate 8, a groove formed by the radially outer peripheral side of the columnar member 17 of the adapter 15 and the side surfaces of the engaging portions 15A on both sides thereof via the insulating sheet 18. Supports the coil 7 in contact with the coil 7 portion. Further, the annular protrusion 15C of the adapter 15 is continuously arranged on the entire circumference.

  Next, as shown in FIG. 11, the cooling jacket 6 accommodates the coil ends 7A between the inner and outer peripheral walls 6B and 6C, while 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 8H and the annular protrusion 15C of the adapter 15 respectively. In FIG. 11, only the relationship between the base plate 8 and the adapter 15 is clarified by omitting the illustration of the coil end 7A. Each cooling jacket 6 is prevented from being detached in the axial direction by the side plates 1B and 1C of the case 1 as in the first embodiment. The grooves formed by the radially outer peripheral side of the columnar member 17 and the side surfaces of the engaging portions 15A on both sides thereof are in contact with the coil 7 from the radially inner peripheral side through the insulating sheet 18, and the base plate 8 The slot opening 8F is blocked by the columnar member 17 of the protrusion 15B, and the space inside the cooling jacket 6, the slot space of the stator core 5, and the space on the radially inner peripheral side of the base plate 8 are blocked.

  In the motor generator cooling structure configured as described above, on the inner peripheral side of the base plate 8, the slot opening 8F of the base plate 8 on the radially inner peripheral side of the coil 7 is closed by the columnar member 17 of the protrusion 15B of the adapter 15. Therefore, the space inside the cooling jacket 6 is blocked from the slot space of the stator core 5 and the space on the radially inner peripheral side of the base plate 8. For this reason, it is possible to prevent the cooling oil in the cooling jacket 6 from leaking to the rotor 3 side without completely closing the slot openings 5C of the stator core 5 with resin or the like.

  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 protrusion 15C of the adapter 15 are formed in stepped 6J, 6K and 8H which are engaged with each other in a fitted state. Further, it is possible to prevent the cooling oil in the cooling jacket 6 from leaking from the engagement portion between the two. In addition, since both are fitted by steps 6J, 6K, and 8H, a portion protruding into the cooling jacket 6 is not required, and the dimension can be formed thin in the radial direction. The cooling jacket 6 and the base plate 8 can be positioned without affecting the motor performance, for example, by reducing the linear product ratio of the coil 7.

  Moreover, since the inner peripheral wall 6C of the cooling jacket 6 is fitted to the outer peripheral side of the annular protrusion 15C of the adapter 15 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.

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

  (E) Since the base plate 8 is provided with the adapter 15 that closes the opening 8F toward the radially inner peripheral side of the slot 8A, the cooling oil in the cooling jacket 6 is prevented from leaking to the rotor 3 side. Can do.

  (F) The adapter 15 includes a columnar member 17 inserted into the radially inner circumferential side opening 8F in the base plate 8 and an engaging portion 15A that is a coupling portion that couples the columnar members 17 to each other. Since it is engaged and fixed to the base plate 8 by the joint portion 15A), the columnar member 17 can be securely fixed to the base plate 8 while being held in the opening 8F, and the cooling oil in the cooling jacket 6 can be surely leaked out. I can stop.

  (G) The adapter 15 is formed in a split piece including a plurality of columnar members 17 and an engaging portion 15A that is a connecting portion for connecting them, and the split piece is extended over the entire inner circumference of the base plate 8. Since a plurality of the columnar members 17 are attached, the workability of inserting the columnar members 17 into the openings 8F is improved as compared with the case where the columnar members 17 are integrally connected all around and simultaneously inserted into the openings 8F. improves.

  (H) Since the adapter 15 includes the annular protrusion 15C as a fitting portion that fits the end portion of the inner peripheral wall 6C of the cooling jacket 6, the adapter 15 does not need a portion protruding into the cooling jacket 6 and is dimensioned in the radial direction. The volume of the cooling jacket 6 can be increased in the radial direction, the cooling oil flow rate can be secured, and the linear area ratio of the coil 7 can be reduced without affecting the motor performance. The cooling jacket 6 and the base plate 8 can be positioned.

  (K) Since the annular protrusion 15C as the fitting portion is fitted to the end portion of the inner peripheral wall 6C of the cooling jacket 6 from the inner side in the radial direction, the inner portion is caused by the pressure of the cooling oil generated inside the cooling jacket 6. Even if the peripheral wall 6C is elastically deformed, the protrusion to the rotor 3 side can be suppressed and interference with the rotor 3 can be prevented.

The schematic diagram of the cooling structure of the motor generator which shows one embodiment of the present invention. Sectional drawing of the cooling structure which similarly includes a stator core. The top view which similarly shows the shape of a baseplate. The fragmentary perspective view of the stator core containing a base plate. The partial perspective view of a cooling jacket. Sectional drawing which shows the attachment state of a cooling structure. Sectional drawing of the cooling structure of the motor generator which shows 2nd Embodiment of this invention. The expanded sectional view of an attachment state. Front view (A), left side view (B), right side view (C), sectional view along line DD (D), and E- Sectional drawing along E line (E). The perspective view which shows the attachment point of an adapter. The perspective view which shows the attachment point of the cooling jacket to an adapter.

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 15 Adapter 16 Engagement pin 17 Columnar member 18 Insulation sheet

Claims (9)

In the motor generator cooling structure comprising a cooling jacket surrounding the coil ends protruding from the respective ends at the front end and the rear end of the stator core to form a liquid-tight annular space,
A base plate is fixedly disposed at the front end and the rear end of the stator core, respectively.
A motor generator cooling structure, wherein a stator core side end of the cooling jacket is engaged with the base plate and positioned.   2. The motor generator cooling structure according to claim 1, wherein the cooling jacket is held with an outer peripheral wall abutting against an inner surface of the case cylindrical portion and a bottom wall abutting against the case side plate. 3.   3. The motor generator cooling structure according to claim 1, wherein the base plate is fixed to the stator core by the stator coil by winding the stator coil in a state of being disposed at both ends of the stator core. 4.   2. The motor generator cooling structure according to claim 1, wherein the base plate includes a slot similar to the yoke constituting the stator core. 3.   5. The motor generator cooling structure according to claim 1, wherein the base plate includes an adapter that closes an opening toward an inner peripheral side in the radial direction of the slot. 6.   The adapter includes a columnar member inserted into an opening on the radially inner peripheral side of the base plate and a coupling portion that couples the columnar members to each other, and the adapter is engaged and fixed to the base plate by the coupling portion. 5. The motor generator cooling structure according to 5.   The adapter is formed as a divided piece including a plurality of columnar members and a connecting portion for connecting them, and a plurality of the divided pieces are mounted so as to extend over the entire inner circumference of the base plate. The motor generator cooling structure described in 1.   8. The motor generator cooling structure according to claim 5, wherein the adapter includes a fitting portion that fits into an end portion of an inner peripheral wall of the cooling jacket. 9.   9. The motor generator cooling structure according to claim 8, wherein the fitting portion is fitted to an inner circumferential wall end portion of the cooling jacket from a radially inner circumferential side.

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