JP2015188279A - Power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power generator fixed to a housing in which a stator has a first bracket and a second bracket covering a cooling fan, the length of a coil end portion of the stator is shortened to reduce the amount of copper, a heat radiation area is increased to enhance a cooling effect, and a lead wire drawn from the coil end portion is effectively drawn around to the opposite side to the cooling fan in the housing.SOLUTION: Plural coil end portions 57b, 58b which connect two slots 55 by shortcut at the inside of the inner periphery of a stator core 56 at the opposite side to a cooling fan 29 are dispersively arranged so as to form an opening portion permitting insertion of a rotating shaft 27 at the center portion. A lead wire 82 extending from plural coil end portions 57c, 58c arranged at the cooling fan 29 side is inserted in a cooling passage 81 formed between the outer periphery of the stator 25 and the housing 21, and the lead wire 82 is connected to an external lead wire 83 introduced from the outside in a cover 24.

Description

  The present invention is accommodated in a stator core that surrounds a rotor fixed to a rotating shaft and is provided with a plurality of slots on the inner periphery, and slots that are spaced apart in the circumferential direction of the stator core with a plurality of slots interposed therebetween. A stator comprising a plurality of coil sides connected by a plurality of coil end portions arranged on both ends in the axial direction of the stator core and a coil wound around the stator core, the stator having one end portion of the rotating shaft as an axis The present invention relates to a generator that is fixed to a housing having a first bracket having a supporting bearing portion and a second bracket that covers a cooling fan fixed to the rotating shaft so that cooling air flows in the stator core.

  A generator stator in which a plurality of coil end portions are arranged in an annular arrangement having an inner diameter larger than the inner diameter of the starter core and arranged at both ends of the stator core is already known from Patent Document 1 and the like. Yes.

Japanese Patent Publication No. 04-24939

  However, as disclosed in Patent Document 1, in the structure in which a plurality of coil end portions are arranged at both ends of the stator core so as to have an annular arrangement having an inner diameter larger than the inner diameter of the starter core, the length of the coil end portion is long. Not only does the copper length increase, but the area of the coil end that comes into contact with the outside air becomes relatively small, making it difficult to dissipate heat from the coil end.

  Therefore, in order to reduce the amount of copper by shortening the length of the coil end portion and to improve the cooling effect by increasing the heat radiation area of the coil end portion, along the axis of the rotating shaft on one end side along the axial direction of the stator core. A plurality of coil end portions that are short-cut between the two slots on the inner side of the inner periphery of the stator core when viewed from the direction, and are distributed so as to form an opening that allows the rotation shaft to be inserted at the center. The generator has already been proposed (Japanese Patent Application No. 2012-214188) for such a generator. However, the lead wire is arranged on the opposite side in the axial direction from the coil end portion as described above in the winding method when forming the coil end portion that is dispersedly arranged so as to form such an opening as the center. Therefore, in order to connect this lead wire to the external lead wire, it is necessary to route the lead wire to the opposite side of the cooling fan, and at that time, the lead wire can be effectively routed without applying special processing to the housing. Is desired.

  The present invention has been made in view of such circumstances, while shortening the length of the coil end portion to reduce the amount of copper and improving the cooling effect by increasing the heat dissipation area of the coil end portion, It is an object of the present invention to provide a generator in which a lead wire led out from a coil end portion can be effectively routed to a side opposite to a cooling fan in a housing.

The present invention is accommodated in a stator core that surrounds a rotor fixed to a rotating shaft and is provided with a plurality of slots on the inner periphery, and slots that are spaced apart in the circumferential direction of the stator core with a plurality of slots interposed therebetween. A stator comprising a plurality of coil sides connected by a plurality of coil end portions arranged on both ends in the axial direction of the stator core and a coil wound around the stator core, the stator having one end portion of the rotating shaft as an axis A generator fixed to a housing having a first bracket having a supporting bearing portion and a second bracket covering a cooling fan fixed to the rotating shaft so that cooling air flows in the stator core. A cooling passage for circulating cooling air sucked in is formed between the outer periphery of the stator and the housing; Of the plurality of coil end portions disposed on both ends in the axial direction of the stator core, a plurality of coil end portions disposed on the one end portion side of the rotating shaft are viewed from a direction along the axis of the rotating shaft. The two slots are connected to each other by a shortcut between the inner periphery of the stator core and the center portion is formed with an opening that allows the rotation shaft to be inserted. Lead wires extending from the plurality of coil end portions arranged on the cooling fan side in the direction along the axis of the rotating shaft among the plurality of coil end portions arranged in the direction of the cooling fan are axial directions The cooling passage is inserted into the cover attached to the first bracket on the opposite side so as to be connected to an external lead wire introduced from the outside.

  According to the above feature of the present invention, the coil end portion disposed on the cooling fan side in the direction along the axis of the rotating shaft forms an opening between the two slots while allowing the rotating shaft to pass therethrough. Since it is arranged so as to be tied as a shortcut, it is possible to reduce the amount of copper by shortening the length of the coil end part, and to improve the cooling effect by the cooling air flowing through the stator core, Since the plurality of coil end portions are dispersedly arranged, the heat radiation area of the coil end portions can be increased, and a more excellent cooling effect can be obtained. In addition, a cooling passage is formed between the outer periphery of the housing and the stator so that the cooling air sucked by the cooling fan is circulated. Therefore, the cooling air can be circulated along the outer periphery of the stator to increase the cooling efficiency of the stator. . Moreover, since the lead wires extending from the plurality of coil end portions arranged on the cooling fan side in the direction along the axis of the rotating shaft are inserted into the cooling passage, what is a cooling fan without special processing on the housing? Lead wires can be routed to the opposite side.

It is a side view of the generator of a 1st embodiment. FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1. FIG. 3 is a view taken in the direction of arrow 3 in FIG. 1. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a perspective view of the 1st bracket. It is a perspective view of the 2nd bracket. It is a perspective view of a rotor and a cooling fan. FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 4. It is a perspective view of a bobbin half. It is sectional drawing of the rotor which follows the 11-11 line of FIG. It is a perspective view of a stator. It is the front view which looked at the end of the stator from the direction along the axis line of a rotating shaft. FIG. 4 is a view corresponding to FIG. 3 in a state in which a vibration-proof rubber is attached to the attachment portion. It is a figure corresponding to Drawing 3 in the state where a mounting leg was attached to an attaching part. FIG. 4 is a view corresponding to FIG. 3 in a state where a stay and an anti-vibration rubber are attached to the attachment portion by fastening together. FIG. 6 is a cross-sectional view showing a second embodiment of the present invention and corresponding to a part of FIG. 5.

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

  The first embodiment of the present invention will be described with reference to FIGS. 1 to 16. First, in FIGS. 1 to 3, the generator housing 21 is coupled to the first bracket 22 and the first bracket 22. And a cover 24 attached to the first bracket 22 on the opposite side of the second bracket 23.

  4 and 5 together, a stator 25 is fixed to the first bracket 22 of the housing 21, and one end portion of the rotating shaft 27 is connected to the ball bearing 28 on the bearing portion 22 a of the first bracket 22. A rotor 26 that is rotatably supported through the stator 25 and is surrounded by the stator 25 is fixed to the rotary shaft 27, and a cooling fan 29 that rotates together with the rotary shaft 27 is covered with the second bracket 23.

  Referring also to FIG. 6, the first bracket 22 has a substantially cylindrical shape surrounding the bearing portion 22 a formed in a short cylindrical shape so as to fit the outer ring 28 a of the ball bearing 28 and the stator 25. The cylindrical portion 22b and one end of the cylindrical portion 22b are spaced apart in the circumferential direction of the bearing portion 22a, for example, four locations, and the other end is spaced in the circumferential direction of the one end portion of the cylindrical portion 22b. A plurality of connecting arm portions 22c connected to a plurality of locations are integrally provided.

  Between the outer periphery of the outer ring 28a fitted in the bearing portion 22a and the inner periphery of the bearing portion 22a, a retaining ring 30 for preventing axial movement of the ball bearing 28 in the bearing portion 22a is interposed. The

  Referring also to FIG. 7, the second bracket 23 has a cylindrical side wall portion 23a whose one end is coupled to the cylindrical portion 22b of the first bracket 22, and a radius from the other end of the side wall portion 23a. An inward flange 23b projecting inward in the direction is integrally formed, and a circular opening 31 is formed on the inner periphery of the inward flange 23b.

  At the end of the first bracket 22 on the second bracket 23 side of the cylindrical portion 22b, a flat outward flange 22d is integrally provided so as to protrude outward, and on the outer periphery of the outward flange 22d. In the second bracket 23, a coupling protrusion 22e that slightly protrudes toward the second bracket 23 so as to abut one end of the side wall 23a is formed in an endless manner. Thus, the coupling protrusion 22e of the first bracket 22 is fastened to the side wall 23a of the second bracket 23 with bolts 32 arranged at a plurality of positions spaced in the circumferential direction of the cylindrical portion 22b. The

  The second bracket 23 is attached to a drive source having a crankshaft 34 as a drive shaft connected coaxially to the rotary shaft 27, for example, an engine body 35 of the internal combustion engine E. The flange portion 23b is provided with a plurality of, for example, four fastening holes 36 arranged around the opening portion 31, and the second bracket 23 is fastened to the engine body 35 with bolts 37 inserted through the fastening holes 36. Is done.

  The rotary shaft 27 has a tapered hole 38 at the end on the internal combustion engine E side, and is formed in a cylindrical shape. The rotary shaft 27 is inserted into the second bracket 23 through the opening 31. A tapered portion 34a at the end of the crankshaft 34 is fitted coaxially into the tapered hole 38, and a bolt 39 inserted into the rotating shaft 27 from the cover 24 side is screwed into the crankshaft 34 and tightened. The rotary shaft 27 is coaxially connected to the crankshaft 34 so as not to be relatively rotatable.

By the way, the first bracket 22 is fastened to the engine body 35 in a state where the rotor 25 is fixed to a rotating shaft 27 to which the stator 25 is fixed and one end portion is rotatably supported by the bearing portion 22a. In this case, both end portions of a plurality of, for example, two knock pins 40 for positioning the shafts of the rotary shaft 27 and the crankshaft 34 to be aligned with each other are fastened to the second bracket 23. A plurality of bottomed positioning holes 41 and 42 for fitting are provided in the coupling protrusion 22e of the first bracket 22 and the side wall 23a of the second bracket 23, respectively.

  Referring to FIGS. 8 and 9 together, the rotor 26 is formed by laminating a plurality of electromagnetic steel plates, and on a rotor core 43 fixed to the rotary shaft 27, a plane passing through the central axis of the rotary shaft 27. Field coils 45, 45 arranged on both sides of the PL are wound around a bobbin 44.

  One end of the rotating shaft 27 is press-fitted into an inner ring 28b of the ball bearing 28, and a pair of fields is provided on the outer periphery of a slip ring support 46 fixed to the rotating shaft 27 between the ball bearing 28 and the rotor 26. A pair of slip rings 47, 47 electrically connected to the magnetic coils 45, 45 are provided at intervals in the axial direction of the rotary shaft 27 and are supported by the first bracket 22 as shown in FIG. 4. A pair of brushes 49, 49 held by the brush holder 48 are in sliding contact with the slip rings 47, 47 individually.

  The bobbin 44 is attached to the rotor core 43 such that a pair of bobbin halves 50 and 50 formed in the same shape by a synthetic resin sandwich the rotor core 43 from both sides in a direction along the axis of the rotating shaft 27. Become.

  Referring also to FIG. 10, the bobbin half 50 includes a cylindrical support portion 50 a through which the rotation shaft 27 is inserted outside the rotor core 43 along the axis of the rotation shaft 27, and the rotation shaft 27. A pair of ends that are connected to both sides of the inner end of the cylindrical support portion 50a so as to extend along the one plane PL passing through the central axis, and that are opposed to and contact the outer end of the rotor core 43 along the axis of the rotary shaft 27. Two pairs of inner side plate portions 50c, one pair extending in the axial direction of the rotary shaft 27 along the one plane PL, connected to the plate portion 50b and both longitudinal end portions on the one plane PL side of the end plate portions 50b. And a pair extending in the axial direction of the rotary shaft 27 so as to face the inner side plate portion 50c from the side separated from the one plane PL and continuous to both longitudinal ends of the end plate portion 50b. Two sets of outer side plate portions 50d, a bottom plate portion 50e respectively connecting the inner side plate portion 50c and the outer side plate portion 50d facing each other, and the end plate portion 50b are connected to the inner side plate portion 50c so as to be flush with each other. A pair of inner restricting plate portions 50f that are connected to the outer end portion of the cylindrical support portion 50a, and a pair of connecting plate portions 50g that connect between both end portions of the inner restricting plate portion 50f along the one plane PL. Is integrated.

  The inner side plate portion 50c, the outer side plate portion 50d facing the inner side plate portion 50c, and the bottom plate portion 50e connecting the inner side plate portion 50c and the inner side plate portion 50d are formed outwardly, respectively. Then, two sets of grooves 51 which are paired in the direction along the one plane PL are formed in the bobbin half 50, that is, the bobbin 44. The inner regulating plate portion 50f is provided with flow holes 52 located on both sides of the cylindrical support portion 50a, and a reinforcing frame portion 50h that crosses the flow holes 52 in the direction along the axis of the rotary shaft 27. The bobbin half 50 is integrally formed.

  Referring also to FIG. 11, coil side portions 45 a of field coil 45 are accommodated in grooves 51 that are paired in a direction along one plane PL that passes through the central axis of rotating shaft 27. The coil end portions 45b at both ends of the field coil 45 are connected to the pair of coil side portions 45a so that the movement to the one plane PL side is restricted by the inner restriction plate portion 50f. It arrange | positions so that the said end plate part 50b may be covered.

  In addition, a coil end portion 45b of the field coil 45 is provided on the bobbin 44 at a portion corresponding to the outer end of the rotor core 43, as shown in FIG. 11, on the inner side along the radial direction of the rotary shaft 27. The separation protrusion 50i is divided into an outer portion 45ba and an outer portion 45bb. On both sides of the separation protrusion 50i along the circumferential direction of the rotary shaft 27, the inner portion 45ba and the outer portion Gaps 53 are respectively formed between the side portions 45bb.

  By the way, the end plate portion 50b of the bobbin 44 has a support base 50j that protrudes outward in the axial direction of the rotary shaft 27 from the central portion in the longitudinal direction and supports the coil end portion 45b. An air passage 54 is formed between the coil end portion 45b and the end plate portion 50b on both sides of the support base 50j along the circumferential direction, and is provided integrally with the end plate portion 50b. Moreover, the separation protrusion 50i is provided on the support base 50j.

  On the outer periphery of both end portions in the longitudinal direction of the end plate portion 50b, outer regulation projections 50k that regulate movement toward the side away from the one plane PL are integrally projected, and are formed on the outer end of the support base 50j. Are integrally provided with a restricting protrusion 50m for restricting the outward movement of the coil end portion 45b mounted on the support base 50j.

  Thus, the air passage 54 formed between the coil end portion 45b and the end plate portion 50b on both sides of the support base 50j is formed at the outer end along the radial direction of the rotary shaft 27, and the support base 50j and the both ends. The inner end of the air passage 54 that opens to the outside of the rotor 26 through the space between the outer restricting protrusions 50k and extends along the radial direction of the rotary shaft 27 passes through the flow hole 52 provided in the inner restricting plate portion 50f. The outer end of the rotary shaft 27 along the axial direction is opened to the outside of the rotor 26.

  Referring also to FIG. 12, the stator 25 includes a plurality of output coils 57 and a pair of exciting coils 58 in a stator core 56 in which a plurality of electromagnetic steel plates are laminated and a plurality of slots 55 are provided on the inner periphery. Wrapped.

  Moreover, the stator 25 is fixed to the first bracket 22 so as to be surrounded by the cylindrical portion 22b of the first bracket 22, and the cooling air sucked by the cooling fan 29 is the rotor 26. In addition, the cooling passage 81 formed between the outer periphery of the stator 25 and the inner periphery of the tubular portion 22b can also flow through the stator 25.

  A plurality of circumferential locations, for example, four locations on the outer periphery of the stator core 56 in the stator 25 are press-fitted into the cylindrical portion 22b. By the way, the inner periphery of the cylindrical portion 22b is tapered with the second bracket 23 side as the maximum diameter in order to facilitate the insertion of the stator core 56 into the cylindrical portion 22b from the second bracket 23 side. A press-fit portion 59 for press-fitting the outer periphery of the stator core 56 is provided at four locations spaced in the circumferential direction of the intermediate portion of the cylindrical portion 22b.

  The press-fit portions 59 have a press-fit surface 60 extending along the axis of the rotary shaft 27 at the tip and extend in parallel with the direction along the axis of the rotary shaft 27. The cooling air can flow between the outer periphery of the stator 25 and the inner periphery of the cylindrical portion 22b between the protrusions 61. .

In combination with FIG. 13, a plurality of output coils 57 and a pair of exciting coils 58 are accommodated in two slots 55, 55 spaced apart in the circumferential direction of the stator core 56 with a plurality of slots 55 interposed therebetween. The coil side portions 57a, 58 are connected by a plurality of coil end portions 57b, 57c; 58b, 58c arranged on both ends in the axial direction of the stator core 56.

  In addition, on one end side in the axial direction of the rotating shaft 27, that is, on the side opposite to the cooling fan 29, a shortcut is made between the two slots 55 inward of the inner periphery of the stator core 56 when viewed from the direction along the axis of the rotating shaft 27. A plurality of coil end portions 57b; 58b are connected to each other, and a plurality of conducting wires constituting the coil end portions 57b; 58b are bundled by fasteners 63, and an opening 62 that allows the rotation shaft 27 to pass therethrough is formed at the center. In this way, the coil end portions 57b and 58b that are dispersedly arranged are fixed to each other by varnish impregnation.

  By the way, the coil end portions 57b and 58b as described above are axes in the winding method when forming the plurality of coil end portions 57b and 58b that are dispersedly arranged so as to be formed around the opening 62 as described above. Lead wires 82 extend from the coil end portions 57c, 58c on the opposite side of the direction, and are introduced from the outside in the cover 24 attached to the first bracket 22 on the opposite side of the cooling fan 29 in the axial direction. The lead wire 82 is inserted into the cooling passage 81 so that the lead wire 82 is connected to the external lead wire 83 via the couplers 84 and 85.

  Further, the external lead wire 83 is drawn into the cover 24 through a grommet 87 attached to an opening 86 provided at an end of the second bracket 22 on the cover 24 side.

  Referring again to FIGS. 4, 5, and 8, the cooling fan 29 includes a cylindrical mounting tube portion 29 a that is fitted and fixed to the rotating shaft 27 in the second bracket 23, and the rotor 26. A taper tube portion 29b having a small diameter end connected to the mounting tube portion 29a so as to increase in diameter in the opposite direction, and a base end at a circumferentially spaced position on the outer periphery of the taper tube portion 29b A plurality of blades 29c that are connected to each other, and a ring shape that faces the end of the stator 25 on the cooling fan 29 side, and that are connected in common to the outer periphery of the plurality of blades 29c. A ring plate-like partition plate 29d is integrally provided, and a plurality of reinforcing ribs 29e are integrally projected on the inner periphery of the tapered cylindrical portion 29b.

  A discharge cylinder part 23c for discharging the cooling air discharged from the cooling fan 29 to the side is integrally provided at the lower part of the second bracket 23, and an outer end opening of the discharge cylinder part 23c is provided. Is provided with a louver 64 that divides the outer end opening into a plurality of sections.

  1 and 3-5, the cover 24 has a cylindrical side wall portion 24a and an end wall portion 24b that closes the outer end of the side wall portion 24a, and has a bottom made of synthetic resin. It is formed in a cylindrical shape, and is fixed to the first bracket 22 by being fastened with a bolt 65 to a cylindrical boss portion 22f provided integrally on both sides of the bearing portion 22a in the first bracket 22. .

  A plurality of first suction holes 66 opened downward are provided in the lower portion of the side wall 24 a of the cover 24. A plurality of second suction holes 67 extending in the direction along the axis of the rotary shaft 27 are provided on both sides of the side wall portion 23a at intervals in the vertical direction, and the second suction holes 67 are viewed from the side. A flange portion 24c is provided so as to protrude from the upper edge of the second suction hole 67 so as to be hidden at the bottom. Further, a plurality of third suction holes 68 are provided in the end wall portion 24 b of the cover 24, and the housing is moved from the first suction holes 66, the second suction holes 67, and the third suction holes 68 by the operation of the cooling fan 29. Cooling air is sucked into 21. The third suction hole 68 is open downward, and has a structure in which water such as rainwater from the outside does not easily enter.

  By the way, one end portion of the first bracket 22, that is, the lower portion of the end portion on the cover 24 side, is a flat surface facing the cover 24 side so as to be disposed below the cover 24 when viewed from the cover 24 side. A pair of left and right mounting portions 22g having a mounting surface 70 are integrally provided.

  As shown in FIG. 14, a pair of vibration isolating rubber 72 is attached to these attachment portions 22g with bolts 71 when the generator is supported on a mount 69 via the vibration isolating rubber 72, as shown in FIG. As shown in the figure, for example, when the generator is supported on the mount 69 via the mounting legs 73, the mounting legs 73 are attached with a pair of bolts 71, and as shown in FIG. 16, a stay 74 for attaching the exhaust muffler. And the state which attaches the said vibration-proof rubber 72 by the joint fastening with a pair of volt | bolt 71 can be switched, and versatility can be given to the support leg part of a generator.

  Next, the operation of the first embodiment will be described. The first bracket 22 having a bearing portion 22a that pivotally supports one end of the rotating shaft 27, and the second bracket that covers the cooling fan 29 that rotates together with the rotating shaft 27. The stator 25 is fixed to a housing 21 having a stator 23, and the rotor 26 surrounded by the stator 25 is fixed to the rotating shaft 27. The stator 25 is fixed to the first bracket 22, and the A cylindrical portion 22b surrounding the stator 25 is integrally provided so that the cooling air sucked by the cooling fan 29 is circulated between the outer periphery of the stator 25, and the second bracket 23 is connected to the cylindrical portion. 22b, the cooling air is circulated along the outer periphery of the stator 25 to increase the cooling efficiency of the stator 25, and the long through bolt So as to couple the first and second brackets 22 and 23 without using the cost can be reduced.

  Further, since a plurality of circumferential locations on the outer periphery of the stator 25 are press-fitted into the cylindrical portion 22b, the number of parts can be reduced when the stator 25 is fixed to the first bracket 22.

  Further, since the cooling fan 29 is provided with a ring-plate-shaped partition plate 29d facing the end of the stator 25 on the cooling fan 29 side, the circulation of the cooling air that has circulated along the outer periphery of the stator 25 By changing the direction to the rotating shaft 27 side at the end of the stator 25 on the cooling fan 29 side, the end of the stator 25 on the cooling fan 29 side can be effectively cooled with cooling air.

  Further, the second bracket 23 fastened to the engine body 35 of the internal combustion engine E including the crankshaft 34 coaxially connected to the rotary shaft 27 and one end portion of the rotary shaft 27 are rotated by the bearing portion 22a of the first bracket 22. Positioning for fitting both ends of a plurality of knock pins 40 for positioning the shafts of the rotary shaft 27 and the crankshaft 34 together before fastening the second bracket 23 in a freely supported state. Since the holes 41 and 42 are provided in the first and second brackets 22 and 23, respectively, the concave and convex fitting portions are unnecessary as compared with the first and second brackets 22 and 23 that are fitted and positioned. Without increasing the outer shape of the bracket 23, the outer diameter of the cooling fan 29 can be increased to further improve the cooling effect.

The rotor 26 is wound around a bobbin 44 attached to a rotor core 43 fixed to the rotation shaft 27 on both sides of a plane PL passing through the central axis of the rotation shaft 27. The bobbin 44 at a portion corresponding to the outer end of the rotor core 43 in the axial direction is provided with coil end portions 45b at both ends of the field coil 45 along the axial direction of the rotary shaft 27. Separation protrusions 50i are provided which are divided into an inner portion 45ba along the radial direction of the rotary shaft 27 and an outer portion 45bb, on both sides of the separation protrusion 50i along the circumferential direction of the rotation shaft 27. Since the gaps 53 are formed between the inner side portion 45ba and the outer side portion 45b, the heat radiation area of the coil end portion 45b of the field coil 45 is increased, and the coil end portion 45b Effectively cool the field coil 45 is Te, can be improved power generation efficiency.

  Further, the field plate is raised from the end plate portions 50b of the bobbin 44 so as to face and abut the outer end of the rotor core 43 in the axial direction of the rotary shaft 27 from the end plate portions 50b. A support base 50j that supports the coil end part 45b of the coil 45 forms an air passage 54 between the coil end part 45b and the end plate part 50b on both sides of the support base 50j along the circumferential direction of the rotating shaft 27. Thus, since the separation projection 50i is provided on the support base 50j so as to be integrated with the end plate 50b, the heat dissipation area of the coil end 45b is further increased, and the coil end 45b and the field The magnetic coil 45 can be cooled more effectively, and the power generation efficiency can be further improved.

  Further, a plurality of slots 55 are provided on the inner periphery of the stator core 56 surrounding the rotor 26 fixed to the rotating shaft 27, and the slots 55 are spaced apart in the circumferential direction of the stator core 56 with a plurality of slots 55 interposed therebetween. A plurality of coil side portions 57a; 58a to be accommodated are connected by a plurality of coil end portions 57b, 57c; 58b, 58c arranged on both ends in the axial direction of the stator core 56. An exciting coil 58 is wound around the stator core 56, and the one end portion of the rotating shaft 27 among the plurality of coil end portions 57b, 57c; 58b, 58c disposed outside both ends in the axial direction of the stator core 56. A plurality of coil end portions 57b, 58b arranged on the side opposite to the cooling fan 29 are provided on the rotating shaft 2 As seen from the direction along the axis, the two slots 55 are connected to each other by a shortcut inside the inner periphery of the stator core 56, and an opening 62 that allows the rotation shaft 27 to pass therethrough is formed at the center. Therefore, the length of the coil end portions 57b, 58b can be shortened to reduce the amount of copper, and the cooling effect by the cooling air flowing through the stator core 56 can be improved. The heat dissipation area of the coil end portions 57b and 58b can be increased, and a more excellent cooling effect can be obtained.

  Further, among the plurality of coil end portions 57b, 57c; 58b, 58c arranged on both ends in the axial direction of the stator core 56, a plurality of coils arranged on the cooling fan 29 side in the direction along the axis of the rotary shaft 27. Lead wires 82 extending from the coil end portions 57c and 58c are connected to external lead wires 83 introduced from outside in the cover 24 attached to the first bracket 22 on the opposite side of the cooling fan 29 in the axial direction. Thus, the lead wire 82 is routed to the opposite side of the cooling fan 29 without applying special processing to the housing 21 because the cooling passage 81 is formed between the outer periphery of the stator 25 and the housing 21. Can do.

  A second embodiment of the present invention will be described with reference to FIG. 17. A cooling fan 77 that rotates together with the rotary shaft 27 is covered with a second bracket 23, and the cooling fan 77 is covered with the second bracket 23. A cylindrical mounting cylinder portion 77a fitted and fixed to the rotary shaft 27 in the inside, and a taper having a small diameter end connected to the mounting cylinder portion 77a so as to increase in diameter in the direction opposite to the rotor 26. A cylindrical portion 77b and a plurality of blades 77c whose base end portions are continuously provided at positions spaced apart in the circumferential direction of the outer periphery of the tapered cylindrical portion 77b are integrally provided. A plurality of reinforcing ribs 77d are integrally projected.

  In addition, a ring-plate-shaped partition plate 78 facing the end of the stator 25 on the cooling fan 77 side is fixed to the end of the cylindrical portion 22b of the first bracket 22 on the cooling fan 77 side. That is, the outer peripheral portion of the partition plate 78 is fastened by a plurality of bolts 79 to the outward flange portion 22 d provided integrally with the end portion of the cylindrical portion 22 b on the second bracket 23 side.

  Also in the second embodiment, the direction of flow of the cooling air flowing along the outer periphery of the stator 25 is changed to the rotating shaft 27 side at the end of the stator 25 on the cooling fan 77 side. The end on the cooling fan 77 side can be effectively cooled with cooling air.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

21 ... housing 22 ... first bracket 23 ... second bracket 22a ... bearing 24 ... cover 25 ... stator 26 ... rotor 27 ... rotating shafts 29, 77 .. Cooling fan 55... Slot 56... Stator core 57, 58... Coil 57a, 58a... Coil side 57b, 57c, 58b, 58c. ..Cooling passage 82 ... Lead wire 83 ... External lead wire

Claims (1)

  A stator core (56) surrounding a rotor (26) fixed to the rotary shaft (27) and having a plurality of slots (55) provided on the inner periphery thereof, and a plurality of slots (55) interposed therebetween, the stator core A plurality of coil end portions (57b, 58a) in which a plurality of coil sides (57a, 58a) accommodated in slots (55) spaced apart in the circumferential direction of (56) are disposed outward in both axial directions of the stator core (56). 57c; 58b, 58c) and a stator (25) provided with coils (57, 58) wound around the stator core (56) pivotally supports one end of the rotating shaft (27). A cooling fan fixed to the rotary shaft (27) so as to circulate cooling air through the first bracket (22) having the bearing portion (22a) and the stator core (56). In the generator fixed to the housing (21) having the second bracket (23) covering the cooling fan (29, 77), the cooling passage (81) for circulating the cooling air sucked by the cooling fan (29, 77) Is formed between the outer periphery of the stator (25) and the housing (21), and the plurality of coil end portions (57b, 57c; 58b, 58c) disposed on both ends in the axial direction of the stator core (56). Among these, a plurality of coil end portions (57b, 58b) arranged on the one end side of the rotating shaft (27) are arranged on the inner periphery of the stator core (56) when viewed from the direction along the axis of the rotating shaft (27). Further, the two slots (55) are connected to each other in a short-cut manner, and an opening (62) that allows the rotation shaft (27) to pass therethrough is formed at the center. Among the plurality of coil end portions (57b, 57c; 58b, 58c) that are arranged and arranged outward at both axial ends of the stator core (56), the cooling fan in a direction along the axis of the rotating shaft (27). Lead wires (82) extending from a plurality of coil end portions (57c, 58c) arranged on the (29, 77) side are axially opposite to the cooling fan (29, 77) on the first bracket. A generator characterized by being inserted into the cooling passage (81) so as to be connected to an external lead wire (83) introduced from outside in a cover (24) attached to (22).

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