JP2013188030A - Liquid-cooled rotary electrical machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a liquid-cooled rotary electrical machine capable of surely securing sealability even though a deviation in a central position of both flow channels to be connected occurs.SOLUTION: An adaptor 31 mounts a flange part 34 in a space formed by a first fitting recessed part 40 and a second fitting recessed part 41 in a floating fitted state, both faces of a first O ring 37 in an axial direction attached to a first fitting part 32 in an outwardly fitted state are brought into contact with a bottom face of the first fitting recessed part 40 and one end face of the flange part 34 in an axial direction, both faces in a radial direction are brought into contact with an inner circumferential face of the first fitting recessed part 40 and an outer circumferential face of the first fitting part 32, both faces of a second O ring 38 in an axial direction attached to a second fitting part 33 in an outwardly fitted state are brought into contact with a bottom face of the second fitting recessed part 41 and the other end face of the flange part 34 in an axial direction, and both faces in a radial direction are brought into contact with an inner circumferential face of the second fitting recessed part 41 and an outer circumferential face of the second fitting part 33.

Description

  The present invention relates to a liquid-cooled rotary electric machine in which a cooling flow path is built in both a frame and a bracket, and particularly to a connection structure of both cooling flow paths.

  In a conventional liquid-cooled rotating electrical machine, a motor body that has a coolant passage and generates a driving force for an electric vehicle, and a motor body that is mounted on the motor body, the coolant circulates inside the motor body, And a controller attached to the motor body via the heat sink (see, for example, Patent Document 1).

  In a conventional liquid-cooled rotary electric machine, the connection structure between the coolant passage in the heat sink and the coolant passage in the motor body is not specifically shown. It is common to use.

  In the conventional joint, the straight flow path passes through the center of the shaft, and both end portions of the outer periphery are formed as fitting portions each having an O-ring. (For example, refer to Patent Document 2).

JP 2004-201462 A JP-A-11-252863

  In the conventional joint, the fitting portion on which the O-ring is mounted is press-fitted into the flow path, and the O-ring is compressed in the radial direction to ensure the sealing performance. Therefore, if the center positions of the two flow paths into which the fitting portions are inserted are shifted, the axial center of the fitting portion is inclined with respect to the flow path center, and the O-ring radial compression is not uniform in the circumferential direction. , Leading to a decrease in sealing performance. That is, when using a conventional joint, it is required to match the center positions of two connected flow paths with high accuracy.

  However, in a conventional liquid-cooled rotary electric machine, the center position of both flow paths is likely to be displaced due to a work error or assembly error of the frame of the motor body and the heat sink. Therefore, when a conventional joint is used for connection of a flow path of a conventional liquid-cooled rotating electrical machine, there is a possibility that the sealing performance cannot be secured.

  The present invention has been made in order to solve the above-described problems. The liquid-cooled rotary electric machine is capable of reliably ensuring sealing performance even if the joint position is devised and the center position of both connected flow paths is displaced. The purpose is to obtain.

  A liquid-cooled rotary electric machine according to the present invention is disposed at a cylindrical frame having a first cooling flow path, a first end frame disposed at one axial end of the frame, and an axial other end of the frame. A housing having a second end frame in which a second cooling channel is built, a ring-shaped stator core that is housed and held in the frame, and a stator having a stator coil wound around the stator core; And a rotor that is pivotally supported by the first and second end frames and rotatably disposed on the inner peripheral side of the stator. The frame and the second end frame are provided with a first fitting recess and a first fitting recess which are provided at the other end surface in the axial direction of the frame by enlarging the opening end of the first connection channel of the first cooling channel. (2) The opening end of the second connection channel of the cooling channel is enlarged and the second fitting recess formed in the one end surface in the axial direction of the second end frame is opposed to each other so that the end surfaces are brought into contact with each other. The first cooling flow path and the second cooling flow path are connected by a joint attached to the first fitting recess and the second fitting recess facing each other. The joint has an annular flange portion having an outer shape smaller than the inner shape of the first fitting recess and the second fitting recess and larger than the inner shape of the first connection channel and the second connection channel, A cylindrical first fitting portion extending from the inner peripheral end of the flange portion to one axial side, and a cylindrical second fitting extending from the inner peripheral end of the flange portion to the other axial direction An adapter that has a joint portion and is mounted with the flange portion being positioned in a space constituted by the first fitting recess and the second fitting recess, and being fitted to the first fitting portion. Mounted, elastically deformed by a force that abuts the end surfaces of the frame and the second end frame, and both axial surfaces are in contact with the bottom surface of the first fitting recess and the axial end surface of the flange portion, and An annular shape in which both radial surfaces are in contact with the inner peripheral surface of the first fitting recess and the outer peripheral surface of the first fitting portion 1 seal member and the second fitting portion are fitted in an externally fitted state, elastically deformed by a force to bring the end surfaces of the frame and the second end frame into contact with each other, and both axial surfaces thereof are the second fitting An annular second seal member that is in contact with the bottom surface of the concave portion and the other axial end surface of the flange portion, and whose both radial surfaces are in contact with the inner peripheral surface of the second fitting concave portion and the outer peripheral surface of the second fitting portion; It is equipped with.

  According to this invention, the adapter is mounted loosely in the space formed by the first fitting recess and the second fitting recess, and the frame and the second end frame are interposed via the first and second seal members. Is held elastically. Therefore, even if the hole center positions of the first fitting recess and the second fitting recess are shifted, the adapter is displaced so as to relieve the unbalanced state between the compressed state of the first seal member and the compressed state of the second seal member. To do. Thereby, the contact state between the first seal member, the first fitting recess and the adapter is ensured, and the contact state between the second seal member, the second fitting recess and the adapter is ensured, and good sealing performance is obtained. .

It is sectional drawing which shows the liquid cooling type rotary electric machine which concerns on Embodiment 1 of this invention. It is a disassembled perspective view explaining the connection state of the cooling flow path in the liquid cooling type rotary electric machine which concerns on Embodiment 1 of this invention. It is a partially broken side view explaining the structure of the joint in the liquid cooling type rotary electric machine which concerns on Embodiment 1 of this invention. It is principal part sectional drawing which shows the periphery of the cooling flow path connection part in which the flow path center position in the liquid cooling type rotary electric machine which concerns on Embodiment 1 of this invention corresponds. It is principal part sectional drawing which shows the periphery of the cooling flow path connection part in which the flow path center position shifted | deviated in the liquid cooling type rotary electric machine which concerns on Embodiment 1 of this invention. It is principal part sectional drawing which shows the cooling flow path connection part periphery in the liquid cooling type rotary electric machine which concerns on Embodiment 2 of this invention. It is principal part sectional drawing which shows the cooling flow path connection part periphery in the liquid cooling type rotary electric machine which concerns on Embodiment 3 of this invention. It is principal part sectional drawing which shows the cooling channel connection part periphery in the liquid cooling type rotary electric machine which concerns on Embodiment 4 of this invention. It is principal part sectional drawing which shows the cooling flow path connection part periphery in the liquid cooling type rotary electric machine which concerns on Embodiment 5 of this invention. It is a principal part perspective view which shows the periphery of the cooling flow path connection part in the liquid cooling type rotary electric machine which concerns on Embodiment 6 of this invention. It is sectional drawing which shows the adapter in the liquid cooling type rotary electric machine which concerns on Embodiment 7 of this invention. It is sectional drawing which shows the adapter in the liquid cooling type rotary electric machine which concerns on Embodiment 8 of this invention.

  Hereinafter, preferred embodiments of a liquid-cooled rotary electric machine according to the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
1 is a cross-sectional view showing a liquid-cooled rotary electric machine according to Embodiment 1 of the present invention, and FIG. 2 is an exploded view for explaining a connection state of cooling channels in the liquid-cooled rotary electric machine according to Embodiment 1 of the present invention. FIG. 3 is a partially broken side view for explaining the configuration of the joint in the liquid-cooled rotary electric machine according to the first embodiment of the present invention, and FIG. 4 is a liquid-cooled rotary electric machine according to the first embodiment of the present invention. FIG. 5 is a cross-sectional view of the main part showing the periphery of the cooling flow path connection portion where the flow path center positions coincide with each other, and FIG. 5 is a cooling flow path connection in which the flow path center position is shifted in the liquid-cooled rotary electric machine according to Embodiment 1 It is principal part sectional drawing which shows the circumference of a part.

  1 and 2, a liquid-cooled rotating electrical machine 100 includes a motor 1 and an inverter device 20 that converts DC power supplied from the outside into AC power and supplies the AC power to the motor 1. Is integrally assembled on the opposite side of the motor 1.

  The motor 1 includes a cylindrical motor frame 3, a load-side end frame 4 as a first end frame disposed on the load side of the motor frame 3, and a second end disposed on the non-load side of the motor frame 3. A housing 2 composed of an anti-load side end frame 5 as a frame; a rotor 10 rotatably disposed in the housing 2; and a stator 15 attached to the motor frame 3 so as to surround the rotor 10. ing.

  The load-side end frame 4 is manufactured in a disk shape, and a load-side bearing 6 is mounted at the axial center position, and is fastened and fixed to the load-side end surface of the motor frame 3. The anti-load side end frame 5 is manufactured in a disk shape, and the anti-load side bearing 7 is mounted at the axial center position. The load-side end frame 4 is fastened and fixed to the load-side end face of the motor frame 3, and the anti-load-side end frame 5 is fastened and fixed to the anti-load-side end face of the motor frame 3 to constitute the housing 2. The first cooling flow path 25 is built in the motor frame 3, and the second cooling flow path 26 is built in the anti-load side end frame 5. One end of the first cooling channel 25 and one end of the second cooling channel 26 are connected via a joint 30. The first water supply / drain port 27 is disposed on the motor frame 3 so as to be connected to the other end of the first cooling flow path 25, and the second water supply / drainage port 28 is connected to the other end of the second cooling flow path 26. It is disposed on the anti-load side end frame 5.

The motor frame 3, the load side end frame 4, and the anti-load side end frame 5 are manufactured by die casting using, for example, aluminum. However, the material is not limited to aluminum as long as the material is a good heat conductive metal. The method is not limited to die casting.
Moreover, although the motor frame 3 and the load side end frame 4 are comprised by another component, you may comprise as an integral thing.

  The rotor 10 has a cylindrical rotor core 11 formed by laminating magnetic thin plates such as electromagnetic steel plates, and is mounted so as to penetrate the outer peripheral side of the rotor core 11 in the axial direction, and at an equiangular pitch in the circumferential direction. A plurality of permanent magnets 12 provided, and a shaft 13 inserted so as to penetrate the axial center position of the rotor core 11 and fixed to the rotor core 11 are provided. In addition, the permanent magnet 12 is arrange | positioned so that the polarity of a radial direction outer side may be alternated with the N direction and the S pole in the circumferential direction.

  The rotor 10 is supported at the other end side in the axial direction of the shaft 13 by the load side end frame 4 via the load side bearing 6, and at one end side in the axial direction of the shaft 13 through the anti load side bearing 7. 5 is rotatably supported in the housing 2.

  The stator 15 is configured by laminating magnetic thin plates such as electromagnetic steel plates, and extends inward in the radial direction from the inner peripheral surface of the annular core back 17 and the core back 17, and is equiangularly spaced in the circumferential direction. The stator core 16 having a plurality of teeth 18 arranged in the above and the stator coil 19 produced by winding a conductor wire coated with insulation around the teeth 18.

  The stator 15 is inserted into the motor frame 3 in a state where the stator core 16 is fitted therein, and is fixed by shrink fitting or the like, and is held by the motor frame 3 coaxially with the shaft 13 on the outer peripheral side of the rotor core 11.

  The inverter device 20 includes a power module 21 disposed in the circumferential direction on the surface on the antiload side of the antiload side end frame 5, a circuit board (not shown) on which a circuit for driving the power module 21 is mounted, A protective cover 23 is mounted on the anti-load side end frame 5 so as to cover the power module 21 and the circuit board, and protects the power module 21 and the circuit board.

  In the liquid-cooled rotating electrical machine 100 configured as described above, DC power supplied from an external power source is converted into AC power by the inverter device 20 and supplied to the stator coil 19. Thereby, a rotating magnetic field is generated in the stator 15. A rotational force is generated by the interaction between the rotating magnetic field of the stator 15 and the magnetic field of the permanent magnet 12, the rotor 10 is rotationally driven, and the rotational torque is output via the shaft 13.

  Then, for example, cooling water is supplied from the first water supply / drain port 27 to the first cooling flow path 25 by a pump (not shown), and after flowing through the first cooling flow path 25, the second cooling flow is supplied via the joint 30. It flows into the path 26. Then, after the cooling water flows through the second cooling flow path 26, the cooling water is drained to the outside from the second water supply / drain port 28.

  Therefore, the heat generated in the stator coil 19 is transmitted to the motor frame 3 through the stator core 16, and is radiated to the cooling water flowing through the first cooling flow path 25, and the temperature rise of the stator 15 is suppressed. Heat generated in the power module 21 of the inverter device 20 is transmitted to the anti-load side end frame 5 and dissipated to the cooling water flowing through the second cooling flow path 26, and the temperature rise of the power module 21 is suppressed.

  Next, a connection structure between the first cooling channel 25 and the second cooling channel 26 will be described with reference to FIGS. 3 and 4.

  As shown in FIG. 3, the joint 30 has a first fitting portion 32 and a second fitting portion 33 that are coaxially connected via a flange portion 34, and the through hole 35 has an axial center with the hole direction as an axial direction. The adapter 31 formed at the position, the first O-ring 37 made of rubber as the first seal member mounted in the first fitting portion 32 in the outer fitting state, and the second fitting portion 33 in the outer fitting state And a rubber second O-ring 38 as a second seal member. The first and second fitting portions 32 and 33 are formed in a cylindrical body having the same shape, and the flange portion 34 is formed in an annular flat plate having a larger diameter than the first and second fitting portions 32 and 33. The first and second O-rings 37 and 38 are formed in an annular ring body having a circular cross section of the same shape, and when the first and second O-rings 37 and 38 are attached to the first and second fitting portions 32 and 33, The diameter of the center line passing through the cross-sectional center of 38 is configured to be smaller than the outer diameter of the flange portion 34.

  On the other hand, at the opening end of the first connection channel 25a having a circular cross section at one end of the first cooling channel 25, the first fitting recess 40 having a circular cross section is formed by expanding the diameter of the first connection channel 25a. At the opening end of the second connection flow path 26 a having a circular cross section at one end of the second cooling flow path 26, the second connection flow path 26 a is expanded to have a second circular cross section having the same inner diameter as the first fitting recess 40. A fitting recess 41 is formed. And the outer diameter of the 1st fitting part 32 is smaller than the internal diameter of the connection flow path 25a, and the axial direction length of the 1st fitting part 32 is longer than the depth (axial direction length) of the 1st fitting recessed part 40. It has become. The outer diameter of the second fitting portion 33 is smaller than the inner diameter of the connection channel 26a, and the axial length of the second fitting portion 33 is longer than the depth (axial length) of the second fitting recess 41. Yes. Furthermore, the outer diameter of the flange portion 34 is larger than the inner diameters of the first and second connection flow paths 25a and 26a and smaller than the inner diameters of the first and second fitting recesses 40 and 41. When the first and second O-rings 37 and 38 are attached to the first and second fitting portions 32 and 33, the outer diameter is slightly smaller than the inner diameters of the first and second fitting recesses 40 and 41. Yes.

  The joint 30 is attached to the motor frame 3 by inserting the first fitting portion 32 to which the first O-ring 37 is attached into the first connection channel 25 a of the first cooling channel 25. Then, the anti-load side end frame 5 is made to be opposite to the motor frame 3 so that the second fitting portion 33 to which the second O-ring 38 is attached is inserted into the second connection flow path 26 a of the second cooling flow path 26. Position adjustment is performed so that the center hole positions of the first fitting recess 40 and the second fitting recess 41 coincide with each other so as to reach the load side end face.

  Next, as shown in FIG. 2, the mounting screw 29 is passed through the through hole 9 of the anti-load side end frame 5 and fastened to the screw hole 8 formed on the anti-load side end face of the motor frame 3. The end frame 5 is fastened and integrated with the motor frame 3.

  Thereby, the fastening force of the mounting screw 29 compresses the first O-ring 37 in the axial direction by the bottom surface of the first fitting recess 40 and the end surface of the flange portion 34 on the first fitting portion 32 side, and the second fitting is performed. The bottom surface of the combined recess 41 and the end surface of the flange portion 34 on the second fitting recess 41 side act to compress the second O-ring 38 in the axial direction.

  Therefore, as shown in FIG. 4, the first O-ring 37 is elastically deformed so as to be compressed in the axial direction and expanded in the radial direction, and both axial surfaces of the first O-ring 37 are formed on the first fitting recess 40. The bottom surface is in contact with the end surface of the flange portion 34 on the first fitting portion 32 side, the inner peripheral surface of the first O-ring 37 is in contact with the outer peripheral surface of the first fitting portion 32, and the outer peripheral surface of the first O-ring 37 is the first fitting. It contacts the inner peripheral surface of the joint recess 40. Similarly, the second O-ring 38 is elastically deformed so as to be compressed in the axial direction and expanded in the radial direction, and both axial surfaces of the second O-ring 38 are in contact with the bottom surface of the second fitting recess 41 and the first flange portion 34. 2 is in contact with the end surface on the fitting portion 33 side, the inner peripheral surface of the second O-ring 38 is in contact with the outer peripheral surface of the second fitting portion 33, and the outer peripheral surface of the second O-ring 38 is the inner peripheral surface of the second fitting recess 41. To touch. Thereby, the sealing property in the connection part of the 1st cooling flow path 25 and the 2nd cooling flow path 26 is ensured.

  Here, it is assumed that the hole center of the second fitting recess 41 is positioned below the hole center of the first fitting recess 40 as shown in FIG. Thereby, the axial center of the adapter 31 is inclined with respect to the hole center direction of the first fitting recess 40 and the second fitting recess 41. That is, the adapter 31 is inclined so that the second fitting portion 33 side faces downward.

  In the space constituted by the first fitting portion 32, the first fitting concave portion 40, and the flange portion 34, the radial clearance on the upper side and the axial clearance on the lower side are narrowed, and the radial clearance on the lower side and the upper side are reduced. The axial clearance becomes wider. Therefore, on the upper side of the first O-ring 37, the amount of axial compression decreases as the axial clearance increases, but the radial clearance is narrow, so the outer peripheral surface of the first O-ring 37 and the first fitting recess 40 are reduced. And the contact state between the inner peripheral surface of the first O-ring 37 and the outer peripheral surface of the first fitting portion 32 are ensured. In addition, on the lower side of the first O-ring 37, the radial gap is widened, but the axial gap is narrowed, so that the amount of compression in the axial direction increases, and the outer peripheral surface of the first O-ring 37 and the first fitting recess 40. And the contact state between the inner peripheral surface of the first O-ring 37 and the outer peripheral surface of the first fitting portion 32 are ensured.

  In the space formed by the second fitting portion 33, the second fitting recess 41, and the flange portion 34, the radial gap on the upper side and the axial gap on the lower side are widened, and the radial gap on the lower side and the upper side are increased. The axial gap becomes narrower. Therefore, on the upper side of the second O-ring 38, the radial gap is widened, but since the axial gap is narrowed, the amount of compression in the axial direction is increased, and the outer peripheral surface of the second O-ring 38 and the second fitting recess 41 are increased. The contact state with the inner peripheral surface and the contact state between the inner peripheral surface of the second O-ring 38 and the outer peripheral surface of the second fitting portion 33 are ensured. Further, on the lower side of the second O-ring 38, the amount of axial compression decreases as the axial clearance increases, but the radial clearance decreases, so the outer peripheral surface of the second O-ring 38 and the second fitting recess 41 are reduced. The contact state with the inner peripheral surface and the contact state between the inner peripheral surface of the second O-ring 38 and the outer peripheral surface of the second fitting portion 33 are ensured.

  Further, the adapter 31 is disposed loosely in a space formed by the first and second fitting recesses 40 and 41, and the motor frame 3 and the anti-load side via the first and second O-rings 37 and 38. The end frame 5 is elastically supported. Therefore, the adapter 31 is axially arranged so that the compressed state of the first O-ring 37 and the compressed state of the second O-ring 38 are balanced even if the hole center positions of the first and second fitting recesses 40 and 41 are shifted. Or move in the radial direction, and the posture of the adapter 31 changes. Therefore, the contact state between the first O-ring 37 and the first fitting recess 40 and the adapter 31 and the contact state between the second O-ring 38 and the second fitting recess 41 and the adapter 31 are ensured.

  Thus, according to the first embodiment, the adapter 31 has an outer diameter that is smaller than the inner diameters of the first and second fitting recesses 40 and 41 and larger than the inner diameters of the first and second connection flow paths 25a and 26a. A plate-like annular flange portion 34 having a cylindrical first portion extending from the inner peripheral end of the flange portion 34 to both sides in the axial direction and having an outer diameter smaller than the inner diameter of the first and second connection flow paths 25a, 26a. And the second fitting portions 32, 33, and the flange portion 34 is positioned in a space formed by the first and second fitting concave portions 40, 41 and is mounted in a loosely fitted state. Then, the first O-ring 37 is attached to the first fitting portion 32 in an externally fitted state, and is elastically deformed by a fastening force that brings the end surfaces of the motor frame 3 and the anti-load side end frame 5 into contact with each other. Both surfaces are in contact with the bottom surface of the first fitting recess 40 and one axial end surface of the flange portion 34, and both radial surfaces thereof are on the inner peripheral surface of the first fitting recess 40 and the outer peripheral surface of the first fitting portion 32. Touch. Further, the second O-ring 38 is attached to the second fitting portion 33 in an externally fitted state, and is elastically deformed by a fastening force that brings the end surfaces of the motor frame 3 and the anti-load side end frame 5 into contact with each other. Both surfaces are in contact with the bottom surface of the second fitting recess 41 and the other axial end surface of the flange portion 34, and both surfaces in the radial direction are on the inner peripheral surface of the second fitting recess 41 and the outer peripheral surface of the second fitting portion 33. Touch. Therefore, even if the hole center positions of the first fitting recess 40 and the second fitting recess 41 are shifted, the contact state between the first O-ring 37, the first fitting recess 40 and the adapter 31, and the second O-ring 38, A contact state between the second fitting recess 41 and the adapter 31 is ensured, and a good sealing property is obtained.

  Since the axial length of the adapter 31 is longer than the axial length between the bottom surfaces of the first and second fitting recesses 40, 41, the first and second fitting portions 32, 33 are attached when the joint 30 is mounted. The extended end side is inserted into the first and second connection flow paths 25a, 26a. Thereby, the joint 30 is mounted in a stable state, and a situation in which the first and second O-rings 37 and 38 are sandwiched between the motor frame 3 and the anti-load side end frame 5 is avoided.

  Here, the effect of the center line passing through the center of the circular cross section of the first and second O-rings 37 and 38 being positioned on the inner diameter side of the outer diameter of the flange portion 34 will be described.

  First, when the center line passing through the center of the circular cross section of the first and second O-rings 37 and 38 is located on the outer diameter side from the outer diameter of the flange portion 34, the outer peripheral edge portion of the flange portion 34 is the first. Further, it corresponds to the inner peripheral side of the center line passing through the center of the circular cross section of the second O-rings 37 and 38. Therefore, when the motor frame 3 and the anti-load-side end frame 5 are fastened and fixed, the first and second O-rings 37 pushed toward the flange portion 34 by the bottom surfaces of the first and second fitting recesses 40 and 41. , 38 are easily displaced to the outer diameter side. Accordingly, there is a possibility that the inner peripheral surfaces of the first and second O-rings 37 and 38 may not come into contact with the outer peripheral surfaces of the first and second fitting portions 32 and 33. Further, since the outer peripheral edge portion of the flange portion 34 is pressed against the first and second O-rings 37 and 38, the first and second O-rings 37 and 38 are easily damaged.

  When the center line passing through the center of the circular cross section of the first and second O-rings 37 and 38 is located on the inner diameter side of the outer diameter of the flange portion 34, the motor frame 3 and the anti-load side end frame 5 are fastened and fixed. In this case, the first and second O-rings 37 and 38 are pressed and clamped by the two planes of the end surface of the flange portion 34 and the bottom surfaces of the first and second fitting recesses 40 and 41. As a result, the first and second O-rings 37 and 38 are compressed in the axial direction and expanded in the radial direction, ensuring excellent sealing performance and suppressing occurrence of damage.

Embodiment 2. FIG.
FIG. 6 is a cross-sectional view of the main part showing the periphery of the cooling flow path connecting portion in the liquid-cooled rotary electric machine according to Embodiment 2 of the present invention.

  In FIG. 6, the inner diameter of the second connection channel 26b is larger than the inner diameter of the first connection channel 25a, and the inner diameter of the second fitting recess 41a is larger than the inner diameter of the first fitting recess 40. The outer diameter of the second fitting portion 33a of the adapter 31A is larger than the difference between the inner diameter of the first connection channel 25a and the inner diameter of the second connection channel 26b, and the outer diameter of the first fitting portion 32. The inner diameter and outer diameter of the second O-ring 38a are larger than the difference between the inner diameter of the first connection flow path 25a and the inner diameter of the second connection flow path 26b, and the inner diameter and outer diameter of the first O-ring 37.

  The joint 30 </ b> A configured in this way is attached to the motor frame 3 by inserting the first fitting portion 32 to which the first O-ring 37 is attached into the first connection flow path 25 a. Then, the anti-load side end frame 5 is directed to the anti-load side end surface of the motor frame 3 so that the second fitting portion 33a to which the second O-ring 38a is attached is inserted into the second connection flow path 26b. Position adjustment is performed so that the center hole positions of the first fitting recess 40 and the second fitting recess 41a coincide. Next, the anti-load side end frame 5 is fastened and integrated with the motor frame 3.

  As a result, the first O-ring 37 is elastically deformed so as to be compressed in the axial direction and expanded in the radial direction, and both axial surfaces of the first O-ring 37 are aligned with the bottom surface of the first fitting recess 40 and the flange portion 34. The inner peripheral surface of the first fitting portion 32 is in contact with the inner peripheral surface of the first O-ring 37, the outer peripheral surface of the first fitting portion 32, and the outer peripheral surface of the first O-ring 37 is the inner peripheral surface of the first fitting recess 40. To touch. Similarly, the second O-ring 38a is elastically deformed so as to be compressed in the axial direction and expanded in the radial direction, and both axial surfaces of the second O-ring 38a are in contact with the bottom surface of the second fitting recess 41a and the second of the flange portion 34. 2 is in contact with the end surface on the fitting portion 33a side, the inner peripheral surface of the second O-ring 38a is in contact with the outer peripheral surface of the second fitting portion 33a, and the outer peripheral surface of the second O-ring 38a is the inner peripheral surface of the second fitting recess 41a. To touch. Thereby, the sealing property in the connection part of the 1st cooling flow path 25 and the 2nd cooling flow path 26 is ensured.

  Therefore, the second embodiment also has the same effect as the first embodiment.

Embodiment 3 FIG.
FIG. 7 is a cross-sectional view of the main part showing the periphery of the cooling flow path connecting portion in the liquid-cooled rotary electric machine according to Embodiment 3 of the present invention.

  In FIG. 7, the inner diameter of the second fitting recess 41 b is larger than the inner diameter of the first fitting recess 40. The outer diameter of the second O-ring 38 b is larger than the difference between the inner diameter of the first fitting recess 40 and the inner diameter of the second fitting recess 41 b and the outer diameter of the first O-ring 37.

  The joint 30 </ b> B configured as described above is attached to the motor frame 3 by inserting the first fitting portion 32 to which the first O-ring 37 is attached into the first connection flow path 25 a. Then, the anti-load side end frame 5 is directed to the anti-load side end surface of the motor frame 3 so that the second fitting portion 33 to which the second O-ring 38b is attached is inserted into the second connection flow path 26a. Position adjustment is performed so that the center hole positions of the first fitting recess 40 and the second fitting recess 41b coincide. Next, the anti-load side end frame 5 is fastened and integrated with the motor frame 3.

  As a result, the first O-ring 37 is elastically deformed so as to be compressed in the axial direction and expanded in the radial direction, and both axial surfaces of the first O-ring 37 are aligned with the bottom surface of the first fitting recess 40 and the flange portion 34. The inner peripheral surface of the first fitting portion 32 is in contact with the inner peripheral surface of the first O-ring 37, the outer peripheral surface of the first fitting portion 32, and the outer peripheral surface of the first O-ring 37 is the inner peripheral surface of the first fitting recess 40. To touch. Similarly, the second O-ring 38b is elastically deformed so as to be compressed in the axial direction and expanded in the radial direction, and both axial surfaces of the second O-ring 38b are in contact with the bottom surface of the second fitting recess 41b and the first of the flange portion 34. 2 is in contact with the end surface on the fitting portion 33 side, the inner peripheral surface of the second O-ring 38b is in contact with the outer peripheral surface of the second fitting portion 33, and the outer peripheral surface of the second O-ring 38b is the inner peripheral surface of the second fitting recess 41b. To touch. Thereby, the sealing property in the connection part of the 1st cooling flow path 25 and the 2nd cooling flow path 26 is ensured.

  Therefore, the third embodiment also has the same effect as the first embodiment.

Embodiment 4 FIG.
FIG. 8 is a cross-sectional view of the main part showing the periphery of the cooling flow path connecting portion in the liquid-cooled rotary electric machine according to Embodiment 4 of the present invention.

  In FIG. 8, the joint 30C has a first fitting portion 32c and a second fitting portion 33c connected coaxially via a flange portion 34c, and a through hole 35c is formed at the axial center with the hole direction as the axial direction. Adapter 31C, a first O-ring 37c fitted to the first fitting portion 32c in an externally fitted state, and a second O-ring 38c fitted to the second fitting portion 33c in an externally fitted state. The first and second fitting portions 32c and 33c are formed in a cylindrical body having the same shape, and the flange portion 34c is formed in an annular flat plate having a larger diameter than the first and second fitting portions 32c and 33c. The first and second O-rings 37c and 38c are formed into an annular ring body having the same circular cross section, and when the first and second O-rings 37c and 33c are attached to the first and second fitting portions 32c and 33c, The diameter of the center line passing through the center of the cross section 38c is configured to be smaller than the outer diameter of the flange portion 34c.

  The outer diameters of the first and second fitting portions 32c and 33c are larger than the inner diameters of the connection flow paths 25a and 26a and smaller than the inner diameters of the second fitting recesses 40 and 41. The axial lengths of the first and second fitting portions 32c and 33c are shorter than the depth (axial length) of the first and second fitting recesses 40 and 41. The outer diameter of the flange portion 34c is larger than the outer diameters of the first and second fitting portions 32c and 33c, and smaller than the inner diameters of the first and second fitting concave portions 40 and 41. The inner diameter of the through hole 35c is larger than the inner diameters of the connection channels 25a and 26a. Furthermore, the axial length of the adapter 31C is shorter than the total depth of the first and second fitting recesses 40 and 41. When the first and second O-rings 37c and 38c are attached to the first and second fitting portions 32c and 33c, the outer diameter is slightly smaller than the inner diameters of the first and second fitting recesses 40 and 41. Yes.

  The joint 30 </ b> C configured as described above is attached to the motor frame 3 by inserting the first fitting portion 32 c to which the first O-ring 37 c is attached into the first connection flow path 25 a. Then, the anti-load side end frame 5 is directed to the anti-load side end surface of the motor frame 3 so that the second fitting portion 33c to which the second O-ring 38c is attached is inserted into the second connection flow path 26a. Position adjustment is performed so that the center hole positions of the first fitting recess 40 and the second fitting recess 41 coincide. Further, in the same manner as in the first embodiment, the mounting screw 29 is passed through the through hole 9 of the anti-load side end frame 5 and fastened to the screw hole 8 formed on the anti-load side end surface of the motor frame 3. The side end frame 5 is fastened and integrated with the motor frame 3, and the joint 30 </ b> C is attached to the connection portion between the first cooling channel 25 and the second cooling channel 26.

  Also in the fourth embodiment, the adapter 31C is mounted in a loosely fitted state in the space formed by the first and second fitting recesses 40, 41, and the fastening force of the mounting screw 29 is adjusted to the first fitting recess 40. The first O-ring 37c is compressed in the axial direction by the bottom surface of the flange portion 34c and the end surface of the flange portion 34c on the first fitting portion 32c side, and the bottom surface of the second fitting recess portion 41 and the second fitting recess 41 side of the flange portion 34c The second O-ring 38c acts so as to be compressed in the axial direction by the end face.

  Therefore, the first O-ring 37c is elastically deformed so as to be compressed in the axial direction and expanded in the radial direction, and both axial surfaces of the first O-ring 37c are formed on the bottom surface of the first fitting recess 40 and the first of the flange portion 34c. The inner peripheral surface of the first O-ring 37c is in contact with the outer peripheral surface of the first fitting portion 32c, and the outer peripheral surface of the first O-ring 37c is in contact with the inner peripheral surface of the first fitting recess 40. Touch. Similarly, the second O-ring 38c is elastically deformed so as to be compressed in the axial direction and expanded in the radial direction, and both axial surfaces of the second O-ring 38c are in contact with the bottom surface of the second fitting recess 41 and the first of the flange portion 34c. 2 is in contact with the end surface on the fitting portion 33c side, the inner peripheral surface of the second O-ring 38c is in contact with the outer peripheral surface of the second fitting portion 33c, and the outer peripheral surface of the second O-ring 38c is the inner peripheral surface of the second fitting recess 41. To touch. Thereby, the sealing property in the connection part of the 1st cooling flow path 25 and the 2nd cooling flow path 26 is ensured.

Therefore, the fourth embodiment also has the same effect as the first embodiment.
According to the fourth embodiment, since the inner diameter of the through hole 35c of the adapter 31C is larger than the inner diameters of the first and second connection flow paths 25a, 26a, the flow path cross-sectional area at the joint 30C is the first and second connection flows. It is larger than the cross-sectional area of the passages 25a and 26a, and the pressure loss at the joint 30C can be reduced.

Embodiment 5 FIG.
FIG. 9 is a cross-sectional view of the main part showing the periphery of the cooling flow path connecting portion in the liquid-cooled rotary electric machine according to Embodiment 5 of the present invention.

In FIG. 9, the taper surface 42 is formed by chamfering the opening edge of the second fitting recess 41d.
Other configurations are the same as those in the fourth embodiment.

  According to the fifth embodiment, since the tapered surface 42 is formed by chamfering the opening edge portion of the second fitting recess 41d, the second O-ring 38c is attached to the motor frame when the anti-load side end frame 5A is attached. 3 and the non-load-side end frame 5A, the mounting property is improved.

Embodiment 6 FIG.
FIG. 10 is a perspective view of the main part showing the periphery of the cooling flow path connecting portion in the liquid-cooled rotary electric machine according to Embodiment 6 of the present invention.

In FIG. 10, a first protrusion 45 projects from the outer peripheral surface of the motor frame 3 </ b> A and extends in the axial direction. The first connection flow path 25a is formed in the first protrusion 45, and the first fitting recess 40 has a diameter enlarged at the opening end of the first connection flow path 25a and is recessed in the end face on the non-load side of the first protrusion 45. Has been. The 2nd protrusion part 46 is protrudingly provided by the outer peripheral surface of the anti-load side end frame 5B. The second connection flow path 26a is formed in the second protrusion 46, and the second fitting recess 41 is recessed in the load side end surface of the second protrusion 46 by expanding the opening end of the second connection flow path 26a. ing. And although not shown in figure, the joint 30 is arrange | positioned in the space comprised by the 1st and 2nd fitting recessed parts 40 and 41. As shown in FIG.
Other configurations are the same as those in the first embodiment.

  According to the sixth embodiment, the first and second connection flow paths 25a, 26a are provided on the first and second protrusions 45, 46 that are provided on the outer peripheral surfaces of the motor frame 3A and the anti-load side end frame 5B. Since it is formed, the flow path diameters of the first and second connection flow paths 25a and 26a can be increased, and a cooling flow path connection portion with a small flow path resistance can be realized.

Embodiment 7 FIG.
FIG. 11 is a cross-sectional view showing an adapter in a liquid-cooled rotary electric machine according to Embodiment 7 of the present invention.

In FIG. 11, the adapter 31 </ b> D has an inner peripheral surface of the extending end of the first fitting portion 32 d and the second fitting portion 33 d formed in a tapered shape.
Other configurations are the same as those in the first embodiment.

  According to the seventh embodiment, the extending end inner peripheral surfaces of the first fitting portion 32d and the second fitting portion 33d are formed in a tapered shape. Therefore, since the cooling water flows smoothly through the cooling flow path connecting portion, an increase in flow resistance at the cooling flow path connecting portion can be suppressed.

Embodiment 8 FIG.
12 is a sectional view showing an adapter in a liquid-cooled rotary electric machine according to Embodiment 8 of the present invention.

In FIG. 12, the adapter 31E has a first fitting portion 32e and a second fitting portion 33e whose outer peripheral surfaces of the extending ends are formed in a tapered shape.
Other configurations are the same as those in the first embodiment.

  According to the eighth embodiment, the extending end outer peripheral surfaces of the first fitting portion 32e and the second fitting portion 33e are formed in a tapered shape. Therefore, the first and second O-rings are attached to the first and second fitting portions 32e and 33e, the motor frame 3 and the joint are assembled, and the anti-load side end frame 5 and the joint are assembled. The outer peripheral surfaces of the extending ends of the fitting portion 32e and the second fitting portion 33e serve as guide surfaces, and the assemblability is improved.

In each of the above embodiments, the liquid-cooled rotary electric machine in which the inverter device is disposed on the non-load side of the motor has been described. However, the present invention is applied to a liquid-cooled rotary electric machine in which the inverter device is omitted. Even if applied, the same effect is obtained.
Moreover, in each said embodiment, although the 2nd cooling flow path shall be incorporated in the anti-load side end frame, the 2nd cooling flow path may be incorporated in the load side end frame.

  In each of the above embodiments, the anti-load side end frame is fastened and fixed to the frame, but the method of fixing the anti-load side end frame is not limited to this. For example, the outer peripheral edge of the frame may be extended to the anti-load side to provide an annular fitting recess, and the anti-load side end frame may be press-fitted into the fitting recess and fixed to the frame.

  Moreover, in each said embodiment, although the 1st and 2nd fitting recessed part shall be formed in the circular cross section, the cross section of the 1st and 2nd fitting recessed part is not limited to circular, For example, elliptical shape It may be. In this case, the outer shape of the first fitting portion, the flange portion, and the second fitting portion, and further the shape that matches the outer diameter shape of the first and second O-rings to the sectional shape of the first and second fitting recesses. Is desirable.

  In each of the above embodiments, the first and second connection flow paths and the first and second fitting recesses are formed in a circular cross section. However, the cross-sectional shapes of the first and second connection flow paths The first and second fitting recesses may have different cross-sectional shapes. For example, the first and second fitting recesses may have a circular cross section, and the first and second connection channels may have an elliptical shape.

  2 housing, 3 motor frame, 4 load side end frame (first end frame), 5 counter load side end frame (second end frame), 10 rotor, 15 stator, 16 stator core, 19 stator coil, 25 first cooling flow Path, 25a first connection flow path, 26 second cooling flow path, 26a, 26b second connection flow path, 30, 30A, 30B, 30C joint, 31, 31A, 31C, 31D, 31E adapter, 32, 32c, 32d , 32e first fitting portion, 33, 33a, 33c, 33d, 33e second fitting portion, 34, 34c flange portion, 35, 35c through hole, 37, 37c first O-ring (first seal member), 38, 38a, 38b, 38c Second O-ring (second seal member), 40 First fitting recess, 41, 41a, 41b, 4 d second fitting recess, 42 taper surface 45 first protrusion 46 second protrusion, 100 liquid-cooled rotary electric machine.

Claims (10)

A cylindrical frame with a built-in first cooling flow path, a first end frame disposed at one axial end of the frame, and a second cooling flow path disposed at the other axial end of the frame A housing having a second end frame;
A stator having an annular stator core housed and held in the frame in an internally fitted state, and a stator coil wound around the stator core;
A rotor pivotally supported by the first and second end frames and rotatably disposed on the inner peripheral side of the stator,
The frame and the second end frame are provided with a first fitting recess and a first fitting recess which are provided at the other end surface in the axial direction of the frame by enlarging the opening end of the first connection channel of the first cooling channel. (2) The opening end of the second connection channel of the cooling channel is enlarged and the second fitting recess formed in the one end surface in the axial direction of the second end frame is opposed to each other so that the end surfaces are brought into contact with each other. Fixed,
In the liquid-cooled rotating electrical machine in which the first cooling flow path and the second cooling flow path are connected by a joint attached to the first fitting recess and the second fitting recess facing each other,
The above joint is
An annular flange portion having an outer shape smaller than the inner shape of the first fitting recess and the second fitting recess and larger than the inner shape of the first connection channel and the second connection channel, A cylindrical first fitting portion extending from the inner peripheral end to the one axial side, and a cylindrical second fitting portion extending from the inner peripheral end of the flange portion to the other axial direction. An adapter that is mounted by positioning the flange portion in a space formed by the first fitting recess and the second fitting recess;
It is attached to the first fitting portion in an externally fitted state, elastically deformed by a force for bringing the end surfaces of the frame and the second end frame into contact with each other, and both sides in the axial direction and the bottom surface of the first fitting recess An annular first seal member that is in contact with one end surface in the axial direction of the flange portion and whose both surfaces in the radial direction are in contact with the inner peripheral surface of the first fitting recess and the outer peripheral surface of the first fitting portion;
It is attached to the second fitting portion in an externally fitted state, elastically deformed by a force for bringing the end surfaces of the frame and the second end frame into contact with each other, and both axial surfaces are located on the bottom surface of the second fitting recess and the above An annular second seal member that is in contact with the other axial end surface of the flange portion and whose both radial surfaces are in contact with the inner peripheral surface of the second fitting recess and the outer peripheral surface of the second fitting portion;
A liquid-cooled rotary electric machine comprising:   The outer shape of the first fitting portion is smaller than the inner shape of the first connection channel, and the outer shape of the second fitting portion is smaller than the inner shape of the second connection channel. Liquid-cooled rotary electric machine.   The liquid-cooled rotary electric machine according to claim 1 or 2, wherein an axial length of the adapter is longer than a sum of depths of the first fitting recess and the second fitting recess.   The length of the adapter in the axial direction is shorter than the total depth of the first fitting recess and the second fitting recess, and the outer shape of the adapter channel is the first connection channel and the second connection channel. The liquid-cooled rotary electric machine according to claim 1, wherein the electric motor is larger than the inner shape of the path.   The liquid-cooled rotary electric machine according to any one of claims 1 to 4, wherein an opening edge portion of the second fitting recess is formed in a tapered shape. The first seal member and the second seal member are mounted on the first fitting portion and the second fitting portion, and a center line passing through the center of the cross section is located on the inner side of the outer shape of the flange portion. The liquid-cooled rotary electric machine according to any one of claims 1 to 5, wherein the liquid-cooled rotary electric machine is provided.   A first protrusion projecting radially outward on the other axial end of the outer peripheral surface of the frame, and projecting radially outward on one axial end of the outer peripheral surface of the second end frame. A second projection, wherein the first connection channel and the first fitting recess are formed in the first projection, and the second connection channel and the second fitting recess are the second projection. The liquid-cooled rotary electric machine according to any one of claims 1 to 6, wherein the liquid-cooled rotary electric machine is formed in a portion.   The first connection channel and the first fitting recess are formed on the inner side of the outer peripheral surface of the frame, and the second connection channel and the second fitting recess are on the inner side of the outer peripheral surface of the second end frame. The liquid-cooled rotary electric machine according to claim 1, wherein the liquid-cooled rotary electric machine is formed.   9. The extension end inner peripheral surfaces of the first fitting portion and the second fitting portion of the adapter are formed in a tapered shape. 9. Liquid-cooled rotary electric machine.   The extension end outer peripheral surface of the first fitting portion and the second fitting portion of the adapter is formed in a tapered shape, according to any one of claims 1 to 8. Liquid-cooled rotary electric machine.

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