JP4689364B2 - Active oil cooling structure of motor coil - Google Patents

Description

  The present invention relates to a cooling structure that actively cools a motor coil of an electric motor, and more particularly to an active motor winding cooling structure for an electric motor as an auxiliary power source mounted in a hybrid vehicle.

Background of the Invention

  In recent years, in-vehicle electric motors centering on hybrid vehicles have further increased the need for miniaturization, and cooling inside the motor, particularly the motor coil portion, holds the key. Conventionally, there are air-cooled heat transfer, heat conduction from a water-cooled jacket housing, and forced oil cooling to a motor coil. These methods are selected depending on the space in which the electric motor is mounted and restrictions from the vehicle. In particular, construction machinery vehicles have strict requirements for environmental resistance, and a sealed type is unavoidable due to the problem of corrosion resistance of internal parts of the motor. In that case, in order to aim at further miniaturization, the method of directly oil cooling the motor coil is the best. On the other hand, it is preferable that the vehicular electric motor has a structure integrated with a power transmission mechanism such as a transmission under the restriction of the space to be mounted. This transmission is lubricated with oil and is already in an environment where oil is used. There is also one aspect that it is preferable to use this lubricating oil as the oil for oil cooling.

  A cooling structure for an internal liquid-cooled electric motor that directly cools the motor coil with oil has been proposed by, for example, Utility Model Registration No. 2602410 (Patent Document 1). Briefly describing this cooling structure, an electric motor is housed in a casing composed of a hollow cylindrical peripheral wall portion and left and right side wall portions thereof. In the electric motor, a stator in which a motor coil is wound around a plurality of grooves formed at a predetermined pitch in the inner peripheral direction of the cylindrical iron core is fixed to the inner surface of the peripheral wall portion. A rotor fixed to the rotating shaft is disposed inside the stator. Both end output portions of the rotary shaft are rotatably supported on the left and right side walls of the casing via bearings.

  An oil distribution ring is fixed to the inner surface of the peripheral wall portion near the left and right side wall portions. An annular oil circulation groove is formed in the oil distribution ring, and a cooling oil supply port connected to an external oil supply source formed in the peripheral wall portion communicates with the oil distribution groove. Further, the oil circulation groove is provided with a through hole or an oil injection nozzle that branches off from the oil circulation groove and opens toward the end of the motor coil. With this configuration, the cooling oil is directly applied to the end of the motor coil via the through hole or the oil injection nozzle, so that the cooling efficiency is increased. Furthermore, since the cooling oil supply port of the casing is provided in the peripheral wall portion, the cooling oil supply port does not protrude outward from the left and right side wall portions of the casing. Can be downsized.

  Further, for example, a motor cooling circuit proposed in Japanese Patent Application Laid-Open No. 8-130856 (Patent Document 2) is a cylindrical core in which a motor is fixed to the inside of a peripheral wall of a case and a plurality of slots are formed on the inner periphery. A motor coil wound around a plurality of slots of the core, a stator having a motor coil end formed in a circumferential direction at an end of the core, and disposed radially inward of the stator. And a rotor that is rotatably supported. The cooling circuit for supplying the oil discharged from the oil pump to the upper portion of the motor has an injection surface and a cooling port formed on the injection surface and for injecting oil supplied from the supply oil passage. An oil injection unit, the cooling oil injection unit is discontinuously arranged with respect to the inner surface of the peripheral wall of the case adjacent to the end of the injection surface, and the end of the injection surface of the motor coil end It is provided at the top.

When the amount of oil discharged from the oil pump is large, the oil supplied from the supply oil passage is vigorously injected from the injection port formed on the injection surface of the cooling oil injection unit and is directly supplied to the motor coil end. Also, when the amount of oil discharged from the oil pump is small, the oil is not injected vigorously from the injection port and flows downward along the injection surface of the cooling oil injection unit, but the end of the injection surface is the same as the inner wall of the case Since the surface is discontinuous so as not to become a surface and the end of the injection surface is located above the motor coil end, the oil drops from the end of the injection surface to the motor coil end. Therefore, even when the discharge amount of the oil pump is small, the oil can be reliably supplied to the motor coil end.
Utility Model Registration No. 2602410 JP-A-8-130856

  However, the through hole or the injection port in the cooling structure disclosed in Patent Document 1 is connected to the cooling oil supply port formed through the cylindrical peripheral wall portion of the case via an annular oil circulation groove. Since the drilling is performed toward the end of the motor coil, the oil passage that bends after flowing through the annular oil circulation groove until the cooling oil reaches the through hole or the injection port from the cooling oil supply port And is ejected from the through hole or the injection port toward the end of the motor coil. For this reason, when the amount of oil discharged from the oil pump is small and sufficient injection pressure is not ensured, the oil supplied to the through hole or the injection port will not be vigorously injected from the injection port with the help of the channel resistance, The motor motor motor increases in proportion as it drops down along the inner wall surface of the drive unit as it is and is collected in the oil clamp formed at the bottom of the drive unit case without contacting the motor coil end of the motor. Reduce the cooling efficiency of the coil end.

  Further, the pressure drop in the cooling oil passage from the cooling oil supply port formed in the peripheral wall portion of the case to the through hole or the injection port is greatly different depending on the arrangement position of the through hole or the injection port. It is also reflected in the amount of injected oil. That is, the amount of oil injected from the injection port located on the upstream side of the annular oil circulation groove formed in the oil distribution ring tends to be larger than the amount of injection oil injected from the downstream injection port, It becomes difficult to equalize the amount of spray oil for each spray port, resulting in a difference in cooling balance.

  Furthermore, if the end of the motor coil arranged on the same circumference is to be uniformly cooled, the number of spray nozzles must be increased, and as a result, in order to ensure a spray discharge pressure above a certain level. A relatively large pump power is required. This increases motive power other than driving the vehicle, leading to a problem that the driving efficiency of the entire vehicle is reduced and fuel consumption is reduced.

  On the other hand, in the cooling circuit disclosed in Patent Document 2, since the injection port is disposed above the end of the motor coil, even if the cooling oil is ejected vigorously from the injection port, the oil remains at the end of the motor coil. It is only sprayed on the surface of the outer half of the part, and the centrifugal force of the rotating motor coil is also helped, and the inner half of the motor coil end only receives the oil that has flowed down along the peripheral surface of the motor coil end. Not only does it spread throughout, but sufficient cooling performance is not obtained, and non-uniform cooling performance occurs between the outer half and the inner end of the motor coil end. Furthermore, when the pump discharge flow rate is small, the cooling oil is dripped onto the surface of the outer half of the end of the motor coil and gets wet, and sufficient cooling performance cannot be obtained. Since the performance of oil cooling is governed by the heat transfer coefficient between the object to be cooled and the cooling medium, the cooling performance increases as the relative speed at the time of contact between the object to be cooled and the cooling medium increases and the contact area increases. In particular, when the discharge flow rate of the pump is small, a desired cooling effect cannot be obtained even in the outer half of the end of the motor coil.

  The present invention has been made to solve these conventional problems. Specifically, while supplying oil with minimum power, the motor coil end portion is always arranged at a constant speed and in the same circumferential direction. To provide a motor coil cooling structure for an in-vehicle electric motor that can uniformly cool oil at the end portions of a plurality of motor coils and inject the oil by increasing the contact area to increase the contact area. Objective.

The object is to provide a ring-shaped stator core fixed to the inner diameter surface of the motor housing and having a motor coil wound between a plurality of slots formed at a predetermined pitch in the circumferential direction of the inner peripheral surface; A generator / motor that is an auxiliary power source of an in-vehicle engine having an inner peripheral surface and a motor rotor having a ring-shaped rotor yoke that is opposed to each other with a predetermined gap, and bulges from both axial ends of the stator core A ring-shaped impeller that is disposed below both end portions of the motor coil and fixed to both end surfaces in the rotation axis direction of the rotor yoke, and has a plurality of blades on a peripheral surface; and Ri Na has a cooling oil supply port is connected to a part of the motor housing against set outside of the oil supply, the outer end between the first blade adjacent in the circumferential direction It is connected by a wall portion, and the same peripheral wall portion is supplied with the oil introduction opening for receiving the cooling oil supplied from the cooling oil supply port on the outer peripheral surface of the impeller body by the centrifugal force when the motor rotor rotates. This is achieved effectively by the positive oil cooling structure of the motor coil, characterized in that an oil discharge opening for discharging in the radial direction is formed .

  The blades of the impeller preferably rise from a tangent line circumscribing the impeller with an inclination angle of 0 ° to 180 °, or the blades of the impeller have a tangent line circumscribing the impeller to 0 ° to 90 °. A blade extending in the rotation direction of the impeller, a tangent circumscribing the impeller, a blade extending radially at an angle of 90 °, a tangent circumscribing the impeller, and 0 It is also possible to arrange at least two types of blades in the circumferential direction, with the blades extending on the opposite side to the rotation direction of the impeller with an inclination angle of from 0 to 90 °.

  In the present invention, the impeller has a plurality of second blades protruding inward at a predetermined interval in the circumferential direction of the inner peripheral surface, and between the adjacent second blades. The case where the oil discharge hole is formed in the peripheral wall portion of the impeller is also included. In this case, the second blades may be arranged to extend in the axial direction parallel to each other and parallel to the axis of the impeller or intersecting the coaxial line at a required angle. Furthermore, it is preferable that the said impeller has a side wall part which has the height equivalent to each blade | wing, and clamps the said blade | wing at the axial direction both ends of the said 2nd blade | wing of the said impeller.

  Further, it is preferable that both outer end surfaces in the axial direction of the impeller are arranged outside the both end surfaces of the motor coil end portion, and further, the lower end of the impeller enters the lower end portion of the motor housing. An oil sump may be provided, more preferably a cooling oil discharge port is provided at the lower end of the motor housing, and an external hydraulic pressure is provided between the cooling oil discharge port and the cooling oil supply port via a pipe. It is desirable to form a circulation path by being connected by a pump, and to dispose an oil cooling unit between the hydraulic pump and the cooling oil supply port.

Effect

  Cooling oil supplied from an external cooling oil supply source drops through the cooling oil supply port of the motor housing via the motor coil end or directly on the peripheral surface of the ring-shaped impeller. The dripping cooling oil tends to stay between adjacent blades, but the impeller rotates at a high speed together with the motor rotor, so that centrifugal force acts on the cooling oil toward the inner side of the motor coil end arranged in the radial direction. The oil droplets of the cooling oil are sprayed evenly and vigorously. At this time, by changing the inclination angle of the blades in various ways, or by arranging blades having different inclination angles in the circumferential direction, it is possible to control the scattering direction of the cooling oil that is blown off by centrifugal force, etc. Cooling oil can be efficiently scattered to the coil end. Further, the collision between the rotating blades and the dripping oil causes the oil to scatter and become fine particles, so that an effect of increasing the contact area with the contact object can be obtained.

  In addition, when the outer ends of the blades adjacent in the circumferential direction are connected with the outer peripheral wall portion in which the oil introduction opening and the oil discharge opening are formed as described above, the cooling oil introduced from the oil introduction opening is the blade. The oil stored in the space formed between the outer peripheral surface of the vehicle body, the adjacent blades and the outer wall is used without waste, and the oil stored in the space is efficiently motorized by centrifugal force from the oil discharge opening. Released towards the edge.

  Further, the impeller projects a plurality of second blades inwardly at a predetermined interval in the circumferential direction of the inner peripheral surface, and the outer periphery of the impeller between adjacent second blades. When the oil discharge hole is formed in the wall, the cooling oil dripped from the motor housing is introduced into the rotating impeller and moves to the oil sump space formed between the second blades by centrifugal force. And temporarily stored in the oil sump space. The stored oil moves vigorously to the inner surface of the outer peripheral wall portion by inertial force and centrifugal force, and is discharged to the outside from the oil discharge hole formed in the outer peripheral wall portion, and the motor coil end portion disposed in the periphery Radiates uniformly toward the lower surface of When the second blades are arranged to extend in the axial direction so as to intersect the axis of the impeller at a required angle, the inertial force and centrifugal force due to the rotation of the impeller work, and some corner angles If the oil discharge hole is formed in the vicinity of the corner portion, the oil is efficiently discharged.

  When both outer end faces in the axial direction of the impeller are arranged outside the both end faces of the motor coil end, from the cooling oil supply port of the motor housing arranged above the motor coil end. There will be oil that is poured into the outer half of the motor coil end and oil that is poured directly into the impeller, and the oil poured into the impeller is centrifugally separated from the inner half of the motor coil. Since the oil is injected toward the part, the oil is poured over the entire surface of the end part of the motor coil for further efficient cooling.

  Further, if the lower end of the motor housing has an oil sump portion into which the lower end of the impeller enters, the outer peripheral edge of the rotating impeller comes into contact with the oil stored in the oil sump, and Since the oil is lifted by the blades and further sprayed toward the surrounding motor coil end by the centrifugal force, the amount of oil applied to the motor coil end increases and the cooling efficiency further increases. A cooling oil discharge port is formed in the oil reservoir, and the cooling oil discharge port and the cooling oil supply port are connected via a pipe, and a hydraulic pump is arranged in the middle of the pipe to supply oil. Actively circulate through the motor housing. At this time, the oil itself is positively cooled by disposing an oil cooling section on the downstream side of the hydraulic pump. Due to this cooling, the motor coil end is further cooled.

  Although the oil flowing down from the cooling supply port may temporarily stay on the inner surface of the motor coil, it is desirable to return the other oil to the oil reservoir as quickly as possible. If the oil stays in a region other than the necessary portion, oil stirring resistance is generated by the rotating portion, and the motor efficiency and power generation efficiency of the generator / motor are reduced. Therefore, even in the present invention, for example, a groove directed to the oil reservoir is provided on the inner wall surface of the motor housing. In particular, when a starter ring gear is held on the outer peripheral surface of the flyhole, agitation loss due to the ring gear is likely to occur, so when setting the oil amount in the oil reservoir, it is lower than the lowermost surface of the ring gear. It is desirable to set so that

Hereinafter, representative embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of an upper half portion showing an internal structure of a generator / motor having a cooling structure for a motor coil end portion according to the embodiment. The illustrated embodiment illustrates a generator / motor when interposed between an engine of a hydraulic excavator and a main pump. Of course, the cooling structure of the present invention can naturally be applied to other hybrid construction machines, general vehicles, buses, and the like.

First, a generator / motor having a positive oil cooling structure for a motor coil according to the present embodiment will be briefly described with reference to FIG.
In the present embodiment, the generator / motor is incorporated in a motor housing 10 disposed between the crankshaft 1 of the engine and the main pump of the hydraulic excavator. A flywheel 100 fixed to the crankshaft 1 of the engine is rotatably accommodated in the motor housing 10. A ring-shaped stator core 20 is fixed to the inner diameter surface of the motor housing 10, and a motor rotor 30 is rotatably supported by an intermediate shaft portion 40 having the structure shown in FIGS. 12 and 13 inside the stator core 20. . Both ends of the intermediate shaft portion 40 are connected to the crankshaft 1 of the engine and the input shaft of the main pump. The stator core 20 disposed on the outer periphery of the motor rotor 30 is fixedly provided with an impeller 38 that constitutes a characteristic portion of the present invention. On the other hand, a starter ring gear 104 driven by a starter motor (not shown) is closely fitted to the outer periphery of the flywheel 100 by shrink fitting. In the present invention, the flywheel 100 can be eliminated.

  The mounting of the flywheel 100 is not limited to simply increasing the rotational efficiency of the engine, but also has the function of increasing the power generation and motor efficiency of the generator / motor of the present invention. In the present embodiment, an internal spline 101 is formed at the center of the flywheel 100, and the second external spline 42 of the intermediate shaft portion 40 is fitted into the internal spline 101 to be splined. However, the intermediate shaft portion 40 is easily moved in the axial direction with respect to the flywheel 100 only by this spline coupling. In this embodiment, a screw hole 42a is cut at the center of the engine side end of the intermediate shaft 40, and a stepped retainer 44 is fitted via a spring ring 45 into a circular recess 42b formed on the shaft end surface. Then, the stepped retainer 44 is fitted into the recessed portion on the shaft end surface of the intermediate shaft portion 40 and fastened by a tightening bolt 46. At this time, the outer peripheral edge of the spring ring 45 is fitted into a ring-shaped groove formed on the inner peripheral surface of the internal spline 101 of the flywheel, so that the intermediate shaft portion 40 and the flywheel 100 are interposed. The relative movement of is stopped.

  A plurality of bolt insertion holes 102 are formed around the internal spline 101 of the flywheel 100, and the flywheel 100 is bolt holes 1 b formed on the end surface of the crankshaft 1 through the bolt insertion holes 102. The fastening bolt 103 is screwed into the crankshaft 1 to be fixed and integrated. Next, the motor rotor 30 is assembled in the motor housing 10 having the stator core 20 fixed on the inner peripheral surface, and the internal spline coupling portion 33 at the center of the motor rotor 30 is fitted to the first external spline 41 of the intermediate shaft portion 40. After that, as in the first embodiment, the motor housing 10 is fixed to the engine housing EH. Next, the external spline 2a of the input shaft 2 of the main pump is fitted into the first internal spline 43 at the shaft end of the intermediate shaft 40 opposite to the second external spline 42, and the pump housing PH is mounted. The motor housing 10 is fixed with fastening bolts 103.

  As shown in FIGS. 2 and 3, the motor housing 10 has an overall shape of the housing main body 11 formed of a short cylindrical body, and an inverted isosceles triangular frame portion 12 is continuously provided downward from the lower end thereof. . The lower end portion of the housing body 11 and the frame portion 12 communicate with each other via a communication path 13. The end face on the engine side and the end face on the hydraulic pump side of the frame part 12 are closed by closing members 14 and 15 to form an oil reservoir 16 inside. As shown in FIG. 3, the cooling oil is supplied from an external hydraulic pump (not shown) through cooling oil supply ports 11a and 11b provided at two locations on the upper wall portion of the housing body 11, and flows down in the housing. The oil is stored in the oil reservoir 16. When the engine rotates, the internal rotating member of the generator / motor, in particular the rotor yoke 35 rotates in contact with the oil reservoir 16, and at the same time, the oil stored in the oil reservoir 16 is rotated along with the rotation of the motor rotor 30. Circulate inside. Further, in the present embodiment, as shown in FIG. 2, a block-like terminal for connecting six motor coil terminals to an AC power source (inverter) not shown in the pump side region of the upper peripheral surface of the motor housing 10. A connecting portion 17 is provided.

  The stator core 20 is made of a ring-shaped member as shown in FIG. 4, and a plurality of protrusions 21 projecting toward the center at a predetermined pitch in the circumferential direction protrude on the inner peripheral surface thereof. Three coils 23 are sequentially wound around the peripheral surface 21 according to a conventional method. In the present embodiment, a total of 36 protrusions 21 protrude, and constitute a three-phase 12-pole induction motor. As shown in FIG. 1, the stator core 20 is fixedly provided with a roll pin 22 on the inner peripheral surface of the housing body 11. The six motor coil terminals are inserted into the terminal connection portion 17 formed on the peripheral surface of the housing body 11. In the terminal connection portion 17, the motor coil terminal is connected to a terminal of the lead wire 3 extending from an external AC power source via a connector 18. The motor coil is molded with a varnish for fixing the winding or a resin for improving heat dissipation.

  As shown in FIG. 1, the motor rotor 30 includes a rotor flange 31 made of an annular member and a rotor yoke 35 made of a ring-shaped member. As shown in FIG. 5, the rotor flange 31 has an L-shaped yoke support portion 32 for fixing and supporting the rotor yoke 35 on its outer peripheral portion, and a spline connection portion for spline connection with the intermediate shaft portion 40 at its center portion. 33 and an annular disk portion 34 in the middle portion thereof for connecting the yoke support portion 32 and the spline coupling portion 33. The yoke support portion 32, the spline coupling portion 33, and the annular disc portion 34 are integrally cast. The rotor yoke 35 having a square cross section is fastened and fixed to the yoke support portion 32 by a plurality of bolts 37a and nuts 37b. Therefore, the yoke support portion 32 and the rotor yoke 35 are formed with a plurality of bolt insertion holes 32a and 35a for inserting the bolts 37a.

  The spline coupling portion 33 formed at the center of the rotor flange 31 is formed with a plurality of spline teeth 33a parallel to the axial direction on the inner peripheral surface of a hole passing through the central portion having a required length in the axial direction. ing. The spline teeth 33a are spline-coupled with a first external tooth spline 41 formed on the outer peripheral surface of the central portion of the intermediate shaft portion 40.

  As shown in FIG. 6, the ring-shaped rotor yoke 35 has a large number of inductors 36 protruding from the outer circumferential surface of the rotor flange 31 with a predetermined pitch in the circumferential direction of the outer circumferential surface. The outer fitting is fixed. In the present embodiment, the total number of protrusions 21 that protrude from the inner peripheral surface of the stator core 20 and constitute the magnetic poles is 36 as described above, whereas the number of inductors 36 of the rotor yoke 35 is as described above. 24, a pitch difference is provided between the magnetic pole (projecting portion 21) of the stator core 20 and the inductor 36 facing the rotor yoke 35. Incidentally, eight bolt insertion holes 32a and 35a of the yoke support portion 32 and the rotor yoke 35 in the present embodiment are formed.

  When the rotor yoke 35 is fixed to the rotor flange 31, a pair of ring-shaped impellers 38 having the structure shown in FIG. 7 constituting the characteristic part of the present invention are provided on the engine side end face and the pump side end face of the rotor yoke 35. Each is fixed together. As shown in FIGS. 1 and 7, the impeller 38 has a donut-shaped side wall 38a and a flanged flange 38b extending substantially horizontally from the outer diameter end of the donut-shaped side wall 38a to the side opposite to the rotor yoke 35 side. And have. In the present embodiment, in addition to the impeller 38, a ring-shaped disk 39 fitted to the bladed flange 38b is attached.

  Bolt insertion holes 38c for inserting the bolts 37a are formed at positions corresponding to the yoke support portions 32 of the donut-shaped side wall 38a and the bolt insertion holes 32a, 35a of the rotor yoke 35. A plurality of blades 38b 'are erected on the outer diameter surface of the flange 38b with blades at a predetermined pitch in the circumferential direction, and liquid passage holes 38d are formed between the blades 38b'. Further, the ring-shaped disk 39 is similarly formed with a bolt insertion hole 39b at a portion corresponding to the bolt insertion hole 38c. The impeller 38 and the ring-shaped disk 39 are fastened to the rotor flange 31 together with the rotor yoke 35 by the bolts 37a and nuts 37b.

The cooling efficiency of the end portion of the motor coil by the cooling oil varies depending on the standing form of the blade 38b ′.
FIG. 8 schematically shows a change in the radial direction of the oil flowing down to the peripheral surface of the impeller 38 due to the difference in standing of the blade 38b ′. As shown in FIG. 8 (a), the inclination angle α between the blade 38b ′ standing upright from the impeller 38 in the rotation direction of the impeller 38 and the normal line at the rising point of the blade 38b ′. When the angle is 0 ° to 90 °, the oil flowing down from above the impeller 38 is trapped between the adjacent blades 38b ′ and rotated together with the impeller 38 at the initial rotation angle, and passes the drop point. And flows down. At this time, when the blade 38b 'of the impeller 38 comes into contact with the oil surface stored in the lower oil reservoir 16, the rotating blade 38b' scoops up the oil and dissipates the oil obliquely upward in the tangential direction. Let Therefore, when the blade angle is as shown in FIG. 8A, oil is discharged downward in the first half of the rotation angle of the impeller 38, and the end of the coil 23 outside the impeller 38 in the second half. It will be dissipated towards.

  As shown in FIG. 8 (b), the inclination angle α between the blade 38b ′ standing upright from the impeller 38 in the rotation direction of the impeller 38 and the normal line at the rising point of the blade 38b ′. At 0 °, that is, when rising in the normal direction, most of the oil flowing down from above is dissipated in the rotational direction at the initial rotation angle, but as described above, the blade 38b ′ is released from the oil reservoir 16 in the latter half of the rotation. The scooped up oil is dissipated obliquely upward in the rotational direction with a gentle inclination angle. This means that oil is dissipated toward the inner surface near the protrusion 21 at the end of the motor coil than in the case of FIG. As shown in FIG. 8 (c), when the inclination angle α is 90 to 180 °, when the impeller 38 is at the initial rotation angle, the oil diffusion direction is obliquely above the rotation direction of the impeller 38. Therefore, the oil diffuses toward the inner end face of the coil 23, and the oil is not diffused depending on the impeller in the latter half of the rotation angle.

  As described above, when the inclination (standing up) angle α of all the blades 38b ′ is uniformly raised on the outer periphery of the impeller 38, the direction of oil dissipated by the impeller 38 is also uniform, and as a result, the coil 23 Oil is applied only to the region where the end portion is biased, and the entire cooling cannot be performed. FIG. 9 shows an example in which such a problem is eliminated and the blade 38b 'is erected so that oil can be evenly applied to the entire region of the bulging end portion of the coil 23 when the impeller 38 makes one rotation. In the illustrated example, the blade 38b ′ having the inclination angle α of 0 ° to 90 °, the blade 38b ′ having the inclination angle α of 0 °, and the blade 38b ′ having the inclination angle α of 90 ° to 180 ° Dispersed along the outer peripheral surface of the car 38. By doing so, the oil is applied evenly and evenly to the front surface of the end of the motor coil in combination with the oil directly dripping onto the outer surface of the impeller 38 during one rotation of the impeller 38. The end is cooled efficiently.

  As shown in FIGS. 1, 12, and 13, the intermediate shaft portion 40 according to the present embodiment is composed of a single shaft member, and has step portions in the order of the center portion, the pump side end portion, and the engine side end portion. In order to form a small diameter. As described above, the first outer spline 41 that is spline-coupled to the spline coupling portion 33 of the motor rotor 30 is formed at the center outer circumferential portion, and the flywheel 100 has an outer circumferential surface that has the smallest diameter. A second external spline 42 that is splined to the internal spline 101 is formed, and a first internal spline 43 that is splined to the input shaft 2 of the main pump is formed at the end of the pump having an intermediate diameter. Yes. Therefore, in this embodiment, the external spline 2a is formed on the outer peripheral surface of the input shaft 2 of the main pump.

  The motor housing body 11 has a ring-shaped flange 19 integrally extended toward the center on the pump side end surface, and an outer peripheral portion of the annular bearing flange 50 on the inner peripheral portion of the ring-shaped flange 19. Are fixed and integrated. As shown in FIGS. 1 and 14, the bearing flange 50 has an L shape whose vertical section is long in the vertical direction. The outer peripheral portion of the ring-shaped flange 19 is fitted into a notch formed continuously on the outer surface of the inner peripheral edge, and is fastened and fixed by a plurality of bolts and nuts (not shown). In the present embodiment, the ring-shaped flange 19 and the bearing flange 50 are formed separately, but the ring-shaped flange 19 and the bearing flange 50 may be formed integrally when the motor housing 10 is manufactured. it can. That is, the bearing flange 50 is a part of the constituent member of the motor housing 10.

  A bearing support portion 51 extends to the engine side in parallel with the axis on the inner diameter portion of the bearing flange 50. A bearing support surface 51 a of the bearing support portion 51 that supports the inner ring 61 of the bearing 60 is an outer peripheral surface of the bearing support portion 51 as shown in FIG. 1. On the other hand, the outer ring 62 of the bearing 60 is fixedly supported by a bearing support surface 32 b fixed to the crankshaft 1 formed on the pump-side inner peripheral surface of the yoke support portion 32 formed on the outer peripheral portion of the motor rotor 30. . In the present invention, the outer peripheral portion of the motor rotor 30 is rotated through a bearing 60 on a part of the rigid motor housing 10 without fixing and supporting the central portion of the motor rotor 30 so as to rotate together with the rotation shaft. The rotation center of the motor rotor 30 is fixed without swinging, and the rotation center portion is connected to the rotation shaft on the engine side and the rotation shaft on the pump side as described above. The rotational accuracy of the motor rotor 30 is remarkably improved by coupling with the splines.

  Next, the procedure for assembling the constituent members of the generator / motor having the above configuration to the engine and the main pump will be specifically described. First, the bearing 60 is fixed between the bearing support portion 51 of the bearing flange 50 and the rotor flange 31 in which the rotor yoke 35 is fixed on the outer peripheral surface. Next, the outer peripheral portion of the bearing flange 50 integrated with the rotor flange 31 via the bearing 60 is fixed to the inner peripheral edge portion of the ring-shaped flange 19 of the motor housing 10 with bolts and nuts. A stator core 20 around which three coils 23 are wound is fixedly provided on the inner peripheral surface of the motor housing 10. On the other hand, the second external spline 42 of the intermediate shaft portion 40 is fitted into the internal spline 101 of the flywheel 100 before being fixed to the crankshaft 1 as described above. A stepped retainer 44 is fitted into the formed circular recess 42 b via a spring ring 45 and fastened and fixed by a tightening bolt 46. At this time, the outer peripheral edge of the spring ring 45 is fitted in a ring-shaped groove formed on the inner peripheral surface of the internal spline 101 of the flywheel 100.

  Here, the first external spline 41 formed on the central outer peripheral portion of the intermediate shaft portion 40 is fitted into the spline coupling portion 33 at the center portion of the rotor flange 31. Subsequently, a first internal spline 43 formed on the end of the intermediate shaft 40 opposite to the second external spline 42 and an end of the input shaft 2 of the main pump are formed. After the spline connection with the external spline 2a, the housing PH of the main pump is fastened and fixed to the motor housing 10 with bolts to complete the assembly.

  The generator / motor thus incorporated between the engine and the main pump not only further enhances the engine rotation and the generator / motor rotation efficiency by the flywheel 100, but also a flywheel fixed to the crankshaft 1 during engine rotation. Even if surface runout or center runout occurs in 100, the first stage spline coupling between the flywheel 100 and the intermediate shaft portion 40 and the second stage spline coupling between the intermediate shaft portion 40 and the motor rotor 30 are two. Due to the spline coupling of steps, the rotation of the motor rotor 30 is almost free from the influence of the surface runout and the centering of the flywheel 100. In addition, since the motor rotor 30 is rotatably supported by a part of a motor housing which is a rigid body via a bearing 60, the rotation center of the motor rotor 30 is fixed, and the rotation accuracy of the motor rotor 30 is further improved. As a result, the power generation efficiency and motor efficiency of the generator / motor according to the present embodiment are further improved.

  Moreover, since the generator / motor employs the motor coil positive oil cooling structure of the present invention as described above, the cooling formed at the upper end of the motor housing 10 from an external cooling oil supply source (not shown). A part of the cooling oil supplied to the oil supply ports 11a and 11b flows down directly to the outer surface of the motor coil end portion of the stator core 20 disposed below, and travels downward along the surface of each motor coil end portion. The oil flowing down is received at the outer peripheral portion of the impeller 38. A part of the oil that flows down directly from the cooling oil supply ports 11 a and 11 b is received by the outer peripheral portion of the impeller 38 and flows into the inside from the opening side of the impeller 38. When the impeller structure shown in FIG. 7 is adopted, the oil temporarily stored in the many liquid storage windows 39a of the ring-shaped disk 39 in close contact with the donut-shaped side wall 38a of the impeller 38 from the inside The centrifugal force generated by the rotation of the wheel 38 dissipates toward the projection 21 of the stator coil 23 existing around through the liquid passage hole 38d formed in the bladed flange 38b.

  When the blades 38b 'are inclined at different inclination angles, the oil flowing down to the impeller 38 is surrounded by the plurality of blades 38b' having different inclination angles coupled with the centrifugal force generated by high-speed rotation. The coil 23 is uniformly thrown over the entire inner surface of the coil 23, and more efficient cooling is performed.

  10 and 11 show the structure of an impeller showing a second embodiment of the present invention. In the impeller 138 according to the present embodiment, as in the first embodiment, the impeller 138 has the blade 138b standing on the outer peripheral surface of the impeller body 138a. In the present embodiment, the tips of adjacent blades 138b are further connected by a plate material 138c, and both side surfaces in the axial direction are closed to form an oil storage chamber 138d inside. An oil introduction port 138c-1 and an oil discharge port 138c-2 are formed at two locations near the blade 138b of each plate member 138c connecting the adjacent blades 138b.

  As in the first embodiment, the cooling oil supplied from the cooling oil supply port formed in the upper wall portion of the motor housing (not shown) is outside the motor coil end portion of the stator core (not shown). At the same time as dropping onto the surface, it drops onto the outer peripheral surface of the impeller 138 that rotates at high speed and is arranged inside the end of the motor coil. The oil dropped on the outer peripheral surface of the impeller 138 is introduced from the oil introduction port 138c-1 into the oil storage chamber 138d and flows inside the oil storage chamber 138d toward the blade 138b on the upstream side in the rotation direction. The oil is vigorously discharged from the oil discharge port 138c-2 to the outside by centrifugal force. This discharged oil is evenly radiated to the inner surface of the end of the motor coil disposed in the periphery, and cools the entire inner surface evenly.

  15 and 16 show a modification of the impeller 39. FIG. This modification is in the impeller 38 shown in FIG. 7, and second blades 38e protruding inwardly at equal intervals in the inner peripheral direction are provided on the inner peripheral surface thereof. Further, a donut-shaped side wall 38a, which is a side wall, is added to the end of the second blade 38e in the axial direction. That is, an oil sump space S that opens inward is formed between the inner peripheral surface of the impeller 38 and the side wall portion 38a with the second blade 38e as a partitioning portion. Oil is introduced into the rotating impeller 38 beyond the inner peripheral edge of the donut-shaped side wall 38a, and the cooling oil is stored in the oil sump space S. The stored oil is moved from the oil discharge hole 38d formed in the peripheral wall portion of the impeller 38 by centrifugal force while moving to the front surface in the rotational direction of the blade 38e on the rear side in the rotational direction by the inertial force due to the rotation of the impeller 38. To be released. Therefore, the oil discharge hole 38d may be provided so as to be biased toward the 38e side from the circumferential center of the blades 38e and 38b '.

  Further, in this modified example, in order to efficiently store the oil in the oil sump space S, it is not sufficient to simply project the second blade 38e linearly toward the axis, and its projecting shape Various ideas are also made. 15A to 15H show various protruding shapes of the second blade 38e. In order to facilitate understanding, different projecting shapes of the blades 38e are arranged on the inner peripheral surface of the same impeller 38. Note that the hatched portion in the oil sump space S indicates the oil storage state.

  The protruding shape of the blade 38e shown in FIG. 15A is the most basic shape that protrudes linearly toward the axis in a side view. The protruding shape of the blade 38e shown in FIG. 5B is inclined and protruded in the rotational direction when viewed from the side, and the protruding shape of the blade 38e shown in FIG. It bends in a letter shape and protrudes integrally. The protruding shape of the blade 38e shown in FIG. 6D is bent and protruded in an inverted L shape in the rotational direction in a side view as in FIG. 4C, but one end of the tip bending piece 38e-2 is projected. The upright piece 38e-1 is fixedly integrated with the tip of the upright piece 38e-1. The protruding shape of the blade 38e shown in FIG. 5 (e) is integrally bent and bent in a reverse letter shape in the rotational direction when viewed from the side. The protruding shape of the blade 38e shown in FIG. 5F is the same as that in FIG. 5C, but the extension length of the tip bending piece 38e-2 is short, and the tip bending piece 38e- The extending end of 2 is an inclined surface inclined inward. The protruding shape of the blade 38e shown in FIG. 5G is bent and protruded in an inverted L shape in the rotational direction in a side view as in FIG. 4C, but the blade 38e is thin from the impeller 38. It consists of another body which bent the board | plate material, The base end part is being fixed to the internal peripheral surface of the impeller 38 with the volt | bolt. The protruding shape of the blade 38e shown in FIG. 11H is curved and protruded in the rotational direction when viewed from the side. In the above shape, when bent or curved as shown in FIGS. 5B to 5H, not only the oil storage amount increases but also the storage is ensured depending on the protruding length. The

  17 and 18 show a modification regarding the arrangement of the second blade 38e. In the embodiment and the modification described above, the second blade 38e is also extended in parallel with the axis of the impeller 38, like the first blade 38b 'protruding from the outer peripheral surface of the impeller 38. The second blades 38e according to the modified example are inclined and extended so as to intersect with the axis of the impeller 38, not parallel to each other, and the blades 38e are parallel to each other. By arranging the blades 38e so as to be inclined in this manner, when the impeller 38 rotates, the oil introduced into the oil sump space S between the adjacent blades 38e is rotated by the inertial force so that the front corners of the blades 38e at the rear in the rotation direction are A lot of people come to the club. Therefore, the oil discharge hole 38d is formed in the outer peripheral wall portion of the impeller 38 located in the vicinity of the corner portion.

  Also in this modification, the oil introduced into the outer peripheral wall portion of the impeller 38 is collected in the oil sump space S between the adjacent second blades 38e, and the corner portion is caused by the inertial force. The centrifugal force due to the rotation of the impeller 38 is activated, and the oil is discharged from the oil discharge hole 38d to the outside, and is evenly radiated to the inner surface of the end of the motor coil (not shown) disposed in the periphery. Cool the entire inside surface evenly. The inclination angle of the blade 38e is determined in consideration of the inertial force and centrifugal force balance when the impeller 38 rotates. The rotational speed of the impeller fluctuates in synchronization with the engine. However, even at the lowest speed, the gravity as an external force applied to the oil is very small, less than a few percent of the centrifugal force. It is not necessary to consider the oil flow due to gravity.

FIG. 19: has shown the outline | summary of 3rd Embodiment of the positive oil cooling structure of the motor coil based on this invention with the circuit.
In the figure, components substantially the same as those of the first and second embodiments are given the same reference numerals as those of the first embodiment, and corresponding members are also described using the same member names. Yes.

  In the present embodiment, two cooling oil supply ports 11a and 11b are formed in the upper wall portion of the housing body 11 of the motor housing 10 in the same manner as in the first embodiment. Cooling oil is positively supplied to the ports 11a and 11b from an oil pump P installed outside through a pipe 4a branched in the middle. The cooling oil supplied to the cooling oil supply ports 11a and 11b is dropped on the end of the motor coil wound around the stator core 20 fixed to the inner diameter portion of the motor housing 10, and outside the end of the motor coil. While cooling the half part, it is dropped toward the outer peripheral part of the impeller 38 fixed to the motor rotor 30 that is arranged inside the stator core 20 and rotates at high speed along the surface. The dripped oil is affected by the blades 38b 'rising from the outer peripheral portion of the impeller 38 and discharged radially by centrifugal force, and is evenly radiated on the inner surface of the end of the motor coil facing the impeller 38. And cool all of the inner surface evenly. The oil pump P is driven by a gear system built in the engine or a PTO for driving the belt.

  The oil thus cooled at the end of the motor coil flows into the oil reservoir 16 provided at the lower end of the motor housing 10 and is stored in the oil reservoir 16. An oil drain port 16 a with a built-in strainer is provided on the side surface or bottom near the bottom of the oil reservoir 16. The oil discharge port 16a is connected to the other end of a pipe 4b whose one end is connected to the suction port of the oil pump P. The discharge port of the hydraulic pump P is connected to the cooling oil supply port 11a of the motor housing 10. , 11b is connected to one end of the pipe 4a. Accordingly, the cooling oil is introduced into the motor housing 10 through the pipe 4a by driving the oil pump P, and after passing through the inside of the motor housing 10, the oil reservoir 16 formed at the bottom or the periphery thereof. And is circulated through the pipe 4b.

  Furthermore, in this embodiment, the oil cooling part 5 is provided in the middle of the piping 4a that connects the oil pump P and the cooling oil supply ports 11a and 11b. The oil cooling unit 5 can employ a water cooling type or an air cooling type. When the oil cooling unit 5 is of the water cooling type, cooling water for cooling the engine that drives the generator / motor is used, and when it is of the air cooling type, piping to the radiator chamber of the engine so that a sufficient air volume can be obtained. To. Therefore, from the viewpoint of volume efficiency when mounted on a vehicle, a water-cooled type that can reduce the size of the oil cooling unit 5 is preferable. In the present embodiment, the cooling oil is actively circulated, and the oil cooling section 5 is cooled via the pipe 4a immediately before reaching the cooling oil supply ports 11a and 11b provided in the motor housing 10. In order to actively cool the oil, the cooling efficiency inside the motor housing 10 is further increased in combination with the installation of the impeller 38.

  As can be understood from the above description, the positive oil cooling structure for a motor coil according to the present invention is provided with an impeller and preferably while circulating the cooling oil inside and outside the motor housing and at the same time passing outside. Since the cooling oil is actively cooled, the end of the coil 23 can be efficiently and evenly cooled.

  In addition, this invention is not limited to the said embodiment, In the said embodiment, although it does not describe actively, for example, a flywheel is excluded or the outer end surface of an impeller is used as the outer end surface of a motor coil end part. Further, the cooling area of the inner surface of the motor coil can be increased by disposing it further outside. Further, although oil may temporarily stay on the inner surface of the motor coil, it is desirable that other oil be returned to the oil sump as efficiently as possible. If the oil stays in areas other than the necessary part, oil stirring resistance is generated by the rotating part, leading to a reduction in motor efficiency and power generation efficiency of the generator / motor. Therefore, for example, a groove directed to the oil reservoir is provided on the inner wall surface of the motor housing. Furthermore, a return oil passage is positively provided by providing an axial groove on the inner side of the case that holds the stator core. In particular, when the ring gear for the starter is held on the outer peripheral surface of the flyhole as in the first embodiment, since the stirring loss due to the ring gear is likely to occur, the amount of oil in the oil reservoir is set. It is necessary to set so as to be lower than the lowermost surface of the ring gear.

It is a longitudinal cross-sectional view of the generator / motor provided with the cooling structure of the motor coil which is 1st Embodiment of this invention. It is the perspective view which looked at the motor housing which is one of the structural members of the generator / motor from the pump side. It is the perspective view which looked at the motor housing from the engine side. It is the top view which looked at the said stator core by which the coil which is one of the structural members of the said generator / motor was wound from the pump side. It is the perspective view which looked at the rotor flange of the motor rotor which is one of the structural members of the said generator / motor from the pump side. It is a perspective view of the rotor yoke of the motor rotor. It is a perspective view of the impeller which is one of the important structural members of this invention attached to a rotor core. It is explanatory drawing which shows the diffusion state of the oil by the change of the inclination angle of the blade | wing which rises from the said impeller. It is explanatory drawing which shows the impeller which mixed the blade | wing with different inclination | tilt angles, and the dispersion | distribution state of oil. It is a peripheral view which shows the impeller of the oil cooling structure which is 2nd Embodiment of this invention. It is arrow sectional drawing along the XI-XI line shown in FIG. It is the perspective view which looked at the intermediate shaft part which supports a rotor core from the pump side. It is the perspective view which looked at the same intermediate shaft part from the engine side. It is the perspective view seen from the engine side of the bearing flange which is one of the structural members of the said motor housing. It is a fragmentary sectional view which illustrates the modification of the said impeller and various protrusion shape of a 2nd blade | wing. It is arrow sectional drawing along the XVI-XVI line | wire in FIG. It is a fragmentary sectional view of 1/4 part showing other modifications of an impeller. It is an arrow line view along the XVIII-XVIII line in FIG. It is explanatory drawing which shows the circuit structure of the oil cooling structure which is 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crankshaft 1a Inner-tooth spline 2 Input shaft 2a of main pump Outer-tooth spline 3 Lead wire 4a, 4b Pipe 5 Oil cooling part 10 Motor housing 11 Housing main body 11a, 11b Cooling oil supply port 12 Frame part 13 Communication paths 14, 15 Closing member 16 Oil reservoir 17 Terminal connecting portion 18 Connector 19 Ring-shaped flange 20 Stator core 21 Protruding portion 22 Roll pin 23 Coil 30 Motor rotor 31 Rotor flange 32 Yoke support portion
32a, 35a, 38c, 39b Bolt insertion hole 32b Bearing support surface 33 Spline coupling portion 33a Spline teeth 34 Annular disk portion 35 Rotor yoke 36 Inductor 37a Bolt 37b Nut 38, 138 Impeller 38a Donut-shaped side wall portion 38b Bladed flange 38b ', 138b First blade 38e Second blade 38d Fluid passage hole 138a Impeller body 138c Plate material (circumferential wall)
138c-1 Oil introduction port 138c-2 Oil discharge port 138d Oil storage chamber 39 Ring disk 39a Reservoir window 40 Intermediate shaft portion 41 First external spline 42 Second external spline 43 First internal spline 43 44 Stepped Retainer 45 Spring Ring 46 Clamping Bolt 47 Second Internal Spline 48 Third External Spline 50 Bearing Flange 51 Bearing Support 51a Bearing Support Surface 60 Bearing 61 Inner Ring 62 Outer Ring 100 Flywheel 101 Internal Tooth Spline 102 Bolt Insertion Hole 103 Fastening bolt 104 Ring gear P for starter Oil pump EH Engine housing PH Pump housing

Claims (9)

A ring-shaped stator core fixed to the inner diameter surface of the motor housing and having motor windings wound around a plurality of protrusions formed at a predetermined pitch in the circumferential direction of the inner diameter portion; and an inner diameter surface of the stator core; A generator / motor which is an auxiliary power source of an in-vehicle engine provided with a motor rotor having a ring-shaped rotor yoke that is opposed to each other with a predetermined gap;
The stator core is disposed on the inner side of both end portions of the motor winding that bulges outward from one end or both ends in the axial direction, and is fixed to one end surface or both end surfaces in the rotational axis direction of the rotor yoke. A ring-shaped impeller having a plurality of first blades;
Ri Na has a cooling oil supply port portion to be connected to an external oil supply source of the motor housing against set and the motor winding end,
The outer ends of the first blades adjacent to each other in the circumferential direction are connected by a peripheral wall portion, and an oil introduction opening for receiving the cooling oil supplied from the cooling oil supply port on the outer peripheral surface of the impeller body on the peripheral wall portion A positive oil cooling structure for a motor coil, characterized in that an oil discharge opening for discharging the received oil in a radial direction by a centrifugal force when the motor rotor rotates is formed . It said first blade is positively Abrahiya structure of a motor coil according to claim 1, characterized by being extended with a tilt angle of the tangent and 0 ° to 180 ° circumscribing the impeller. The first blade, with the inclination angle of the tangent and 0 ° to 90 ° circumscribing the impeller, a vane extending in the direction of rotation of the impeller, the tangent and 90 ° which circumscribes the same impeller At least two of blades extending radially at an angle, blades extending from the tangent line circumscribing the impeller and an inclination angle of 0 ° to 90 ° opposite to the rotational direction of the impeller 2. The positive oil cooling structure for a motor coil according to claim 1, wherein the blades of different types are mixedly arranged in the circumferential direction. The impeller has a plurality of second blades protruding inward at a predetermined interval in the circumferential direction of the inner peripheral surface, and oil is discharged to a peripheral wall portion between adjacent second blades. The positive oil cooling structure for a motor coil according to any one of claims 1 to 3, wherein a hole is formed. 5. The positive oil cooling structure for a motor coil according to claim 4, wherein the second blades are arranged parallel to each other and extending in the axial direction so as to intersect with an axis of the impeller at a required angle. 6. The motor according to claim 4, wherein the impeller has a side wall portion having a height equivalent to each blade and sandwiching the blade at both axial ends of the second blade of the impeller. Active oil cooling structure of coil. The positive oil cooling structure for a motor coil according to any one of claims 1 to 4, wherein an outer end face in the axial direction of the impeller is arranged outside an end face of the motor coil protrusion. 5. The positive oil cooling structure for a motor coil according to claim 1, further comprising an oil sump portion into which a lower end of the impeller enters a bottom portion of the motor housing. A cooling oil discharge port is provided at the bottom of the motor housing, and the cooling oil discharge port and the cooling oil supply port are connected to each other by an external hydraulic pump via a pipe to form a circulation path. The positive oil cooling structure for a motor coil according to any one of claims 1 to 4, wherein an oil cooling section is disposed between the pump and the cooling oil supply port.

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