WO2020255730A1 - Start-up generator and method for manufacturing start-up generator - Google Patents

Start-up generator and method for manufacturing start-up generator Download PDF

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Publication number
WO2020255730A1
WO2020255730A1 PCT/JP2020/022069 JP2020022069W WO2020255730A1 WO 2020255730 A1 WO2020255730 A1 WO 2020255730A1 JP 2020022069 W JP2020022069 W JP 2020022069W WO 2020255730 A1 WO2020255730 A1 WO 2020255730A1
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WO
WIPO (PCT)
Prior art keywords
bottom portion
side wall
recess
hole
flywheel
Prior art date
Application number
PCT/JP2020/022069
Other languages
French (fr)
Japanese (ja)
Inventor
光太郎 齋藤
楽 板橋
明 新島
敏幸 川島
祐太 西野
Original Assignee
株式会社ミツバ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 株式会社ミツバ filed Critical 株式会社ミツバ
Priority to CN202080044502.8A priority Critical patent/CN114008894A/en
Publication of WO2020255730A1 publication Critical patent/WO2020255730A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2786—Outer rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/02—Additional mass for increasing inertia, e.g. flywheels
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/108—Structural association with clutches, brakes, gears, pulleys or mechanical starters with friction clutches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
    • H02K7/1807—Rotary generators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids

Definitions

  • the present invention relates to a starting generator and a method for manufacturing the starting generator.
  • a start generator in which the rotation of a starter motor is transmitted to the rotation shaft of the engine to start the engine, and the rotational energy of the engine is converted into electric energy to charge a battery or the like. ing.
  • a technique is disclosed in which a clutch mechanism is provided coaxially with the rotation shaft of the engine and the rotation of the starter motor is transmitted via the clutch mechanism.
  • Patent Document 1 discloses a configuration of an alternator having a magnet rotor having a yoke fixed to a cylindrical side portion and connected to a rotating shaft, and a stator.
  • a clutch in-row portion is formed on the bottom of the yoke, and the clutch mechanism is positioned and fixed by the clutch in-row portion.
  • the rotor can be miniaturized by providing the clutch in-row portion on the yoke.
  • sludge generated by the engine when the generator rotates may remain inside the clutch portion.
  • a method of discharging the sludge to the outside for example, it is conceivable to form a hole penetrating in the axial direction in a flywheel or the like in which the clutch portion is housed, and discharge the sludge from this hole.
  • a hole penetrating in the axial direction is newly provided, a step for forming the hole is added, so that the number of steps may increase and the manufacturing cost may increase.
  • the present invention provides a start generator and a method for manufacturing a start generator, which suppresses an increase in the number of steps and reliably discharges sludge that has entered the clutch portion to the outside by a simple method.
  • the starting generator has a tubular first side wall, a yoke having a first bottom portion integrally provided with the first side wall, and an inner peripheral portion of the first side wall.
  • a rotor having a permanent magnet provided in, a second bottom portion provided on the side opposite to the first side wall with respect to the first bottom portion, and a tubular shape extending from the second bottom portion to the opposite side to the first bottom portion.
  • the flywheel includes a flywheel having a second side wall and a clutch portion fixed to at least one of the second side wall and the second bottom portion, and the flywheel is located on a side opposite to the second side wall from the second bottom portion.
  • a boss portion that penetrates the first bottom portion and a second bottom portion that is formed between the first bottom portion and the second bottom portion and opens radially outward in the second side wall. It is characterized by having a recess having an opening to be formed and a through hole formed from the inner surface of at least one of the second bottom portion and the second side wall toward the recess.
  • the starting generator according to the present invention is characterized in that the first bottom portion has a ventilation hole provided at a position overlapping the recessed portion of the second bottom portion.
  • the starting generator according to the present invention is characterized in that the recess is formed in a fan shape in which the opening width in the circumferential direction increases toward the outside in the radial direction when viewed from the axial direction of the second side wall. It is said.
  • the recess is formed in the first step portion formed in the second bottom portion and the second step portion formed in the first step portion and having a recess depth deeper than that of the first step portion. It is characterized by having a step portion.
  • the starting generator according to the present invention is characterized in that both the first stage portion and the second stage portion have the opening, and the through hole is formed in the second stage portion. ..
  • the method for manufacturing a starting generator according to the present invention is the above-described method for manufacturing a starting generator, in which the second side wall and the second bottom having the recess are formed by either forging or casting. It is characterized by having a first step of forming the through hole and a second step of forming the through hole by cutting the second bottom portion from the second side wall side after the first step.
  • a start generator and a method for manufacturing a start generator which suppresses an increase in the number of steps and reliably discharges sludge that has entered the clutch mechanism to the outside by a simple method.
  • Sectional drawing of the start generator which concerns on 1st Embodiment The perspective view of the yoke which concerns on 1st Embodiment.
  • Top view of the second bottom portion in the IV portion of FIG. Sectional drawing of the flywheel which concerns on 1st Embodiment.
  • FIG. 1 is a cross-sectional view of the starting generator 1 according to the first embodiment.
  • the starting generator 1 is an outer rotor type generator, and is an engine connected to a rotor 2 that rotates integrally with the rotating shaft 11 of the engine, a stator 12 that is arranged inside the rotor, and a rotor 2.
  • a fly wheel 3 that rotates integrally with the rotating shaft 11 of the above, a clutch portion 4 arranged inside the fly wheel 3, and a connecting member 5 that connects the rotor 2 and the fly wheel 3 are provided.
  • the rotor 2 is formed in a cylindrical shape centered on an axis C coaxial with the rotating shaft 11 of the engine.
  • the direction along the axis C of the rotor 2 is referred to as an axial direction
  • the direction orthogonal to the axis C is referred to as a radial direction
  • the direction around the axis C is referred to as a circumferential direction.
  • the rotor 2 includes a yoke 20 and a permanent magnet 21 arranged inside the yoke 20.
  • FIG. 2 is a perspective view of the yoke 20 according to the first embodiment.
  • the yoke 20 is provided integrally with the tubular first side wall 22 centered on the axis C and the first side wall 22 and covers the opening of the first side wall 22 on the engine side. It is formed in a bottomed tubular shape having a first bottom portion 23.
  • a protrusion 22a for detecting the rotational position of the rotor 2 and the rotating shaft 11 is projected outward in the radial direction on the first side wall 22 by press working.
  • the first bottom portion 23 of the yoke 20 is formed in an annular shape having an insertion hole 25 in the center.
  • the insertion hole 25 is provided coaxially with the axis C.
  • the first bottom portion 23 further has a first connecting hole 26 and a ventilation hole 27 in addition to the insertion hole 25.
  • the first connecting hole 26 is provided radially outside the insertion hole 25 and penetrates the first bottom portion 23 in the axial direction.
  • a plurality of first connecting holes 26 (6 in the present embodiment) are provided in the circumferential direction.
  • a plurality of ventilation holes 27 (6 in this embodiment) are provided in the circumferential direction. The ventilation hole 27 penetrates the first bottom portion 23 in the axial direction.
  • a permanent magnet 21 is fixed to the inner peripheral portion 24 of the first side wall 22 of the yoke 20.
  • a plurality of permanent magnets 21 are provided in the circumferential direction, and each permanent magnet 21 is magnetized so that magnetic poles are alternately arranged in the circumferential direction.
  • a stator 12 is arranged inside the permanent magnet 21 in the radial direction at intervals from the permanent magnet 21.
  • the stator 12 is fixed to, for example, an engine case (not shown).
  • a coil (not shown) is wound around the stator 12. The winding end of the coil is electrically connected to a battery, electrical components, etc. (all not shown) mounted on the vehicle body.
  • the flywheel 3 is arranged on the engine side in the axial direction with respect to the rotor 2.
  • the flywheel 3 has a tubular second side wall 31 centered on the axis C, a second bottom 32 that covers the opening on the rotor 2 side of the second side wall 31, and from the second bottom 32 to the rotor 2 side. It is formed in a tubular shape having a protruding boss portion 33.
  • the second bottom portion 32 of the flywheel 3 faces the first bottom portion 23 of the rotor 2, and the axially outer end faces of the second bottom portion 32 and the second bottom portion 32 are in contact with each other.
  • the boss portion 33 of the flywheel 3 is integrally formed with the second bottom portion 32.
  • the boss portion 33 projects from the central portion of the second bottom portion 32 toward the rotor 2 side, and is formed in a cylindrical shape coaxial with the axis C.
  • the boss portion 33 is inserted into the insertion hole 25 of the rotor 2.
  • the boss portion 33 has a shaft insertion hole 33a in the center, and the inner shape of the shaft insertion hole 33a is inclined so as to shrink in diameter toward the rotor 2 side according to the shape of the tip of the rotating shaft 11. It has a tapered hole.
  • a male screw 33b is formed at the tip of the rotating shaft 11 protruding toward the rotor 2 with respect to the boss portion 33, and the boss portion 33 and the rotating shaft 11 are fixed with nuts 13 so as to rotate together around the axis C. ing.
  • FIG. 3 is a perspective view of the flywheel 3 according to the first embodiment.
  • FIG. 4 is a top view of the second bottom portion 32 in the IV portion of FIG.
  • FIG. 5 is a cross-sectional view of the flywheel 3 according to the first embodiment.
  • the second bottom portion 32 of the flywheel 3 has a recess 34 recessed from the second bottom portion 32 toward the second side wall 31 side and a second connecting hole 35 penetrating the second bottom portion 32 in the axial direction. And a third connecting hole 45.
  • a plurality of recesses 34 (three in this embodiment) are provided in the circumferential direction.
  • the recess 34 is provided at a position where it overlaps with the ventilation hole 27 provided in the first bottom portion 23 of the yoke 20 in the circumferential direction (see FIG. 1).
  • the recess 34 is provided on the mating surface of the second bottom 32 with the first bottom 23 of the rotor 2.
  • the recess 34 is formed in the first step portion 36 formed in the second bottom portion 32 and the first step portion 36, and has a deeper recess depth than the first step portion 36. It has a second stage portion 37.
  • the recess depth h1 of the first step portion 36 is smaller than the plate thickness t of the second bottom portion 32 (h1 ⁇ t).
  • the recess depth h2 of the second step portion 37 is larger than the plate thickness t of the second bottom portion 32 (h2> t).
  • the first step portion 36 is formed in a substantially fan shape in which the opening width in the circumferential direction increases as it goes outward in the radial direction when viewed from the axial direction.
  • the first step portion 36 has a first opening portion 36a that opens outward in the radial direction.
  • the second step portion 37 is located inside the first step portion 36 when viewed from the axial direction.
  • the second step portion 37 is formed in a shape similar to that of the first step portion 36 when viewed from the axial direction.
  • the second step portion 37 is formed in a fan shape in which the opening width in the circumferential direction increases toward the outside in the radial direction, and one side of the fan shape located on the outer side in the radial direction and the first step portion 36. Is formed so that one side located on the outer side in the radial direction of is at the same position.
  • the second step portion 37 has a second opening portion 37a that opens outward in the radial direction.
  • the circumferential length dimension of the second opening 37a is smaller than the circumferential length dimension of the first opening 36a.
  • the internal space formed by the second step portion 37 is the second. It communicates with the outside of the starting generator 1 through the opening 37a.
  • the second opening 37a and the first opening 36a communicate with each other in the axial direction.
  • a through hole 38 is provided at the radial inner end of the second step portion 37.
  • the through hole 38 penetrates the second step portion 37 in the axial direction.
  • the through hole 38 is a hole that penetrates the second bottom portion 32 because the recess depth h2 of the second step portion 37 is larger than the plate thickness of the second bottom portion 32. That is, as shown in FIGS.
  • the distance h2 from the surface of the second bottom portion 32 on the side where the boss portion 33 protrudes to the bottom surface of the second step portion 37 is the second bottom portion 32.
  • the inner surface of the second side wall 31 or the second bottom 32 is larger than the distance t from the inner surface (the side on which the clutch portion is mounted) to the surface on the side where the boss portion 33 of the second bottom 32 protrudes. It is formed by opening toward the recess 34.
  • the through hole 38 is provided in the entire region of the second step portion 37 located on the inner peripheral surface 30 of the second side wall 31 in the radial direction.
  • the through hole 38 is formed in a semicircular shape when viewed from the axial direction in accordance with the shape of the end portion of the second step portion 37.
  • two second connecting holes 35 are provided between adjacent recesses 34 in the circumferential direction (that is, six in total).
  • the third connecting hole 45 is provided between the two second connecting holes 35 provided between the adjacent recesses 34 in the circumferential direction. That is, a total of three third connecting holes 45 are provided.
  • a clutch portion 4 is provided on the inner peripheral portion of the second side wall 31 of the flywheel 3.
  • the clutch portion 4 has an annular outer ring 43 fixed to the second bottom portion 32 by bolts or the like, and a one-way clutch 41 arranged radially inside the outer ring 43.
  • the outer ring 43 is fixed to the flywheel 3 by being press-fitted into the flywheel 3 and fastened with bolts or the like inserted into the third connecting hole 45 of the second bottom portion 32.
  • the one-way clutch 41 is composed of a plurality of columnar bearings, is arranged in a plurality in the circumferential direction with respect to the inner peripheral side of the outer ring 43, and is rotatably supported in the axial direction.
  • the clutch portion 4 is a disc member having a cylindrical member supported on the inner peripheral portion of the one-way clutch 41 and a gear portion formed integrally with the cylindrical member and meshing with an output gear of a starter motor (not shown) on the outer circumference thereof.
  • the starter meshing gear portion 44 including the above is supported.
  • the outer ring 43 may be provided with a groove or the like that communicates from the inside to the outside in the radial direction for releasing sludge generated by the engine from the one-way clutch 41.
  • the connecting member 5 connects the first bottom portion 23 and the second bottom portion 32 in a state where the first bottom portion 23 of the rotor 2 and the second bottom portion 32 of the flywheel 3 are in contact with each other.
  • the connecting member 5 is a fastening member such as a rivet.
  • the connecting member 5 connects the yoke 20 and the flywheel 3 by being inserted into and fastened (caulked) through the first connecting hole 26 and the second connecting hole 35, respectively.
  • the connecting member 5 may be, for example, a fastening member such as a bolt and a nut, or a member that is welded by welding, heat caulking, or the like.
  • the inner peripheral surface of the insertion hole 25 of the rotor 2 and the boss portion 33 may be fixed by engagement by forming serrations on the outer peripheral surface of the boss portion 33 of the flywheel 3 without using the fastening member. ..
  • the starting generator is manufactured by a first step of forming a second side wall 31 and a second bottom portion 32 having a recess 34 by either forging or casting, and after the first step, a second step. It has a second step of forming a through hole 38 by cutting a second bottom portion 32 from the side wall 31 side, and a third step of connecting the fly wheel 3 and the rotor 2 after the second step.
  • the flywheel 3 is first formed by forging.
  • the thickness of the second side wall 31, the second bottom portion 32, and the boss portion 33 of the flywheel 3 is larger than the design value.
  • the radial thickness and the axial length of the second side wall 31, the axial thickness of the second bottom portion 32, and the radial thickness of the boss portion 33 are larger than the design values, respectively.
  • a second bottom portion 32 having the concave portion 34 is formed by providing the convex portion at a position corresponding to the concave portion 34.
  • a tool such as an end mill or a turning tool is inserted along the axial direction from the second side wall 31 side of the flywheel 3 in order to obtain the inner diameter dimension of the flywheel 3.
  • the inner peripheral part of the wheel is removed. Specifically, the axial end surface of the second side wall 31, the inner peripheral surface 30 of the second side wall 31, and the inner end surface of the second bottom portion 32 are cut. At this time, cutting is performed until the inner peripheral surface 30 of the second side wall 31 is located outside the radial inner end of the second step portion 37 in the radial direction. Further, cutting is performed until the thickness of the second bottom portion 32 becomes smaller than the depth dimension h2 of the second step portion 37.
  • a through hole 38 that communicates the space inside the second side wall 31 and the recess 34 is formed.
  • the second connecting hole 35 is formed by cutting. Further, for example, after cutting with an end mill or the like, the flywheel 3 is rotated at high speed with the boss portion 33 of the flywheel 3 fixed by a chuck or the like, and a tool is applied to the inner peripheral portion of the flywheel 3 to turn it.
  • a through hole 38 may be formed from the inner surface (the side where the clutch portion 4 is mounted) of the second side wall 31 or the second bottom portion 32 toward the recess 34 while finishing the inner peripheral portion.
  • the second connecting hole 35 may be formed by forging in the first step.
  • the flywheel 3 formed by the first step and the second step and the rotor 2 are connected. Specifically, the flywheel 3 and the rotor 2 are fastened by bringing the first bottom portion 23 and the second bottom portion 32 into contact with each other and inserting the connecting member 5 into the first connecting hole 26 and the second connecting hole 35. Fix it.
  • the starting generator 1 is manufactured through the first step, the second step, and the third step. Further, after the first step, the surface of the second bottom 32 on the boss portion 33 side is cut in the second step, the flywheel 3 and the rotor 2 are fixed in the third step, and then the inside of the second bottom 32.
  • a start generator having a flywheel 3 and a rotor 2 in which a through hole 38 is formed on the inner surface of the second side wall 31 or the second bottom 32 by a process of processing the surface (clutch portion 4 mounting side) by turning or the like. 1 may be manufactured.
  • the clutch portion 4 is provided on the inner peripheral portion of the flywheel 3, for example, a starter motor (not shown) connected to the starter meshing gear portion 44 can be used. By driving, the flywheel 3 rotates in a predetermined direction. As a result, the engine of the vehicle can be started. Further, a boss portion 33 is formed on the second bottom portion 32 of the flywheel 3, the boss portion 33 penetrates the first bottom portion 23, and the connecting member 5 connects the first bottom portion 23 and the second bottom portion 32. , The yoke 20 and the flywheel 3 can be connected.
  • the second bottom portion 32 has a recess 34, and the recess 34 is formed with a through hole 38 that penetrates the inner surface of the second side wall 31 or the second bottom portion 32 in the axial direction and the radial direction. As shown by the arrow A in FIG.
  • the sludge generated in the clutch portion 4 when 1 is rotated passes through the through hole 38 from the inner surface (the side where the clutch portion 4 is mounted) of the second bottom portion 32, and the flywheel 3 Moves toward the recess 34 of. Further, since the recess 34 has a first opening 36a and a second opening 37a that open radially outward, sludge that has moved to the recess 34 moves radially outward of the recess 34 due to centrifugal force, and is caused by centrifugal force. It is discharged to the outside of the starting generator 1.
  • the sludge that has entered the clutch portion 4 can be reliably discharged to the outside, and the performance deterioration of the starting generator 1 due to the sludge staying in the clutch portion 4 can be suppressed.
  • the recessing direction of the recess 34 and the penetrating direction of the through hole 38 are both formed along the axial direction of the flywheel 3, the recess 34 and the through hole 38 can be formed by processing from the axial direction. In particular, when a hole other than the through hole 38, such as the second connecting hole 35, is formed on the flywheel 3 by cutting or the like, these processing and the processing of the through hole 38 can be performed coaxially.
  • the processing equipment can be simplified and the holes for sludge discharge can be easily formed as compared with the conventional technique of forming holes penetrating the flywheel 3 in the radial direction for discharging sludge. Therefore, it is possible to provide a starting generator 1 that suppresses an increase in the number of steps and reliably discharges sludge that has entered the clutch portion 4 to the outside by a simple method.
  • the ventilation hole 27 is formed in the first bottom portion 23 of the yoke 20 at a position overlapping the recess 34, for example, the air sent to cool the stator 12 or the like passes through the ventilation hole 27 and is formed in the recess 34. The air is blown to the outside of the starting generator 1 through the recess 34. Therefore, the heat generated by the stator 12 and the rotor 2 can be efficiently discharged to the outside, and the performance deterioration of the starting generator 1 due to heat generation can be suppressed.
  • the recess 34 When viewed from the axial direction, the recess 34 is formed in a fan shape in which the opening width in the circumferential direction increases from the inside in the radial direction to the outside in the radial direction, so that the recess 34 moves into the recess 34 through the through hole 38. Sludge easily moves outward in the radial direction due to centrifugal force. Therefore, the sludge can be discharged to the outside more reliably by the centrifugal force.
  • the recess 34 is divided into a first step portion 36 and a second step portion 37, the recess 34 is formed when the recess 34 is formed as compared with the case where a single recess 34 having a deep recess depth is formed.
  • the amount of processing can be reduced. Therefore, the rigidity of the flywheel 3 can be maintained high.
  • the sludge moved into the recess 34 can be reliably started from the openings 36a and 37a. Can be discharged to the outside of. Further, since the through hole 38 is formed in the second step portion 37 having a recess depth deeper than that of the first step portion 36, the through hole 38 can be easily formed while reducing the processing amount of the flywheel 3.
  • the method for manufacturing a starting generator includes a first step and a second step.
  • the first step the second side wall 31 and the second bottom portion 32 having the recess 34 are formed by either forging or casting.
  • the second side wall 31 and the second bottom portion 32 can be collectively formed by forging or casting.
  • a recess 34 is formed in the second bottom portion 32 in a state where the first step is completed. Therefore, the recess 34 can be easily formed.
  • the through hole 38 is formed by cutting the second bottom portion 32 from the second side wall 31 side.
  • the clutch portion 4 when the clutch portion 4 is arranged on the inner peripheral portion of the second side wall 31, it is necessary to finish the inner peripheral portion of the second side wall 31 by cutting.
  • this finishing process by cutting from the second side wall 31 side so as to reduce the thickness of the second bottom portion 32 of the flywheel 3, the space inside the radial direction on the second side wall 31 side and the second bottom portion 32 are provided.
  • the recess 34 and the recess 34 are communicated with each other.
  • the hole formed in this way is designated as a through hole 38, and sludge or the like that has entered the clutch portion 4 can be discharged to the outside through the through hole 38. Therefore, it is not necessary to form the through hole 38 by another processing, and the manufacturing process can be simplified.
  • FIG. 6 is a cross-sectional view of the flywheel 3 according to the second embodiment.
  • the second embodiment is different from the first embodiment described above in that the recess 34 does not have the second step portion 37.
  • the recess 234 is formed in the second bottom portion 32.
  • the recess 234 is formed by a single step portion having a recess depth h3 larger than the plate thickness t of the second bottom portion 32 (t ⁇ h3).
  • the radial inner end of the recess 234 is located radially inside the inner peripheral surface 30 of the second side wall 31.
  • the recess 234 has a through hole 238. The through hole 238 penetrates the second bottom portion 32 in the axial direction.
  • the configuration of the die used in the forging process is compared with the case where the recess 234 has a plurality of step portions. Can be simplified.
  • FIG. 7 is a cross-sectional view of the flywheel 3 according to the third embodiment.
  • the third embodiment is different from the first embodiment described above in that the recess 34 has a tapered surface.
  • a recess 334 is formed in the second bottom portion 32.
  • the recess 334 has a tapered surface 339 whose recess depth gradually increases from the axially outer end surface of the second bottom 32 toward the bottom 334a of the recess 334.
  • a through hole 338 is formed at the boundary between the bottom surface 334a of the recess 334 and the tapered surface 339. The through hole 338 penetrates the second bottom portion 32 in the axial direction.
  • the starting generator 1 of the third embodiment since the recess 334 has a tapered surface 339, it is possible to improve the mold pullability during forging. Therefore, the starting generator 1 having excellent manufacturability can be obtained.
  • the recess 34 is formed in a fan shape when viewed from the axial direction, but the present invention is not limited to this. That is, the recess 34 may be formed in a shape other than the fan shape, such as a triangular shape, a rectangular shape, or a semicircular shape when viewed from the axial direction.
  • the fan shape when the fan shape is formed, there is an advantage in that the widths of the openings 36a and 37a in the circumferential direction can be largely secured as compared with the case where the fan shape is formed.
  • the boss portion 33 and the second bottom portion 32 may be formed separately. That is, after the boss portion 33 and the flywheel 3 are formed separately, the boss portion 33 may be integrated with the second bottom portion 32 of the flywheel 3 by fastening and fixing or press-fitting.
  • the openings 36a and 37a are provided in both the first-stage portion 36 and the second-stage portion 37, but one of them may not have an opening. That is, when the first opening 36a is provided in the first step portion 36, the second opening 37a may not be provided. When the second opening 37a is provided in the second step portion 37, the first opening 36a may not be provided.
  • the number of steps provided in the recess 34 is not limited to the above-described embodiment.
  • Through holes 38 may be formed in the first step. That is, forging is performed so that the maximum plate thickness h2 of the recess 34 is larger than the plate thickness Tf before cutting (h2> Tf), and then the hole diameter of the through hole 38 is expanded by cutting in the second step. You may.
  • the flywheel 3 may be formed by casting.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

Provided are: a start-up generator reliably externally discharging sludge entered into a clutch portion with a simple method while suppressing increase of the number of processes; and a method for manufacturing the start-up generator. The start-up generator is provided with: a rotor 2 having a yoke 20 and a permanent magnet 21, said yoke 20 having a cylindrical first side wall 22 and a first bottom portion 23 provided integrally with the first side wall 22, said permanent magnet 21 being provided on the inner circumferential portion of the first side wall 22; a flywheel 3 having a second bottom portion 32 and a cylindrical second side wall 31, said second bottom portion 32 being provided on the side opposite to the first side wall 22 with respect to the first bottom portion 23, said second side wall 31 extending from the second bottom portion 32 toward the side opposite to the first bottom portion 23; and a clutch portion 4 fixed to at least one of the second side wall 31 and the second bottom portion 32. The flywheel 3 has a recess portion 34 and a through-hole 38, said recess portion 34 being provided in the second bottom portion 32 and having opening portions 36a, 37a that open to the outside of the second side wall 31 in the radial direction, said through-hole 38 being formed from the inner surfaces of the second bottom portion 32 and the second side wall 31 toward the recess portion 34.

Description

始動発電機及び始動発電機の製造方法Starting generator and manufacturing method of starting generator
　本発明は、始動発電機及び始動発電機の製造方法に関するものである。 The present invention relates to a starting generator and a method for manufacturing the starting generator.
　従来、エンジン車等の車両において、スタータモータの回転をエンジンの回転軸に伝達してエンジンを始動させるとともに、エンジンの回転エネルギを電気エネルギに変換してバッテリ等に充電する始動発電機が知られている。これらの始動発電機では、エンジンの回転軸と同軸にクラッチ機構が設けられ、クラッチ機構を介してスタータモータの回転が伝達される技術が開示されている。 Conventionally, in a vehicle such as an engine vehicle, a start generator has been known in which the rotation of a starter motor is transmitted to the rotation shaft of the engine to start the engine, and the rotational energy of the engine is converted into electric energy to charge a battery or the like. ing. In these starting generators, a technique is disclosed in which a clutch mechanism is provided coaxially with the rotation shaft of the engine and the rotation of the starter motor is transmitted via the clutch mechanism.
　例えば特許文献１には、円筒形の側部に永久磁石が固定され、回転軸に連結されるヨークを有する磁石回転子と、固定子と、を有する交流発電機の構成が開示されている。ヨークの底部にはクラッチインロー部が形成され、クラッチインロー部によってクラッチ機構が位置決めして固定されている。特許文献１に記載の技術によれば、ヨークにクラッチインロー部を設けることにより、回転子を小型化できる。 For example, Patent Document 1 discloses a configuration of an alternator having a magnet rotor having a yoke fixed to a cylindrical side portion and connected to a rotating shaft, and a stator. A clutch in-row portion is formed on the bottom of the yoke, and the clutch mechanism is positioned and fixed by the clutch in-row portion. According to the technique described in Patent Document 1, the rotor can be miniaturized by providing the clutch in-row portion on the yoke.
特許第４７０５６３９号公報Japanese Patent No. 4705339
　このような発電機にあっては、発電機の回転時にエンジンで発生したスラッジがクラッチ部の内部に残留する場合がある。このスラッジを外部に排出する方法として、例えばクラッチ部が収容されるフライホイール等に軸方向に貫通する孔を形成し、この孔からスラッジを排出することが考えられる。
　しかしながら、軸方向に貫通する孔を新たに設ける場合には、孔を形成するための工程が追加されるので、工程数が増加し、製造コストが増加するおそれがある。 In such a generator, sludge generated by the engine when the generator rotates may remain inside the clutch portion. As a method of discharging the sludge to the outside, for example, it is conceivable to form a hole penetrating in the axial direction in a flywheel or the like in which the clutch portion is housed, and discharge the sludge from this hole.
However, when a hole penetrating in the axial direction is newly provided, a step for forming the hole is added, so that the number of steps may increase and the manufacturing cost may increase.
　そこで、本発明は、工程数の増加を抑え、簡素な方法によりクラッチ部に入り込んだスラッジを確実に外部へ排出する始動発電機及び始動発電機の製造方法を提供するものである。 Therefore, the present invention provides a start generator and a method for manufacturing a start generator, which suppresses an increase in the number of steps and reliably discharges sludge that has entered the clutch portion to the outside by a simple method.
　上記の課題を解決するために、本発明に係る始動発電機は、筒状の第一側壁及び前記第一側壁と一体に設けられた第一底部を有するヨークと前記第一側壁の内周部に設けられる永久磁石とを有する回転子と、前記第一底部に対して前記第一側壁と反対側に設けられた第二底部及び前記第二底部から前記第一底部と反対側に延びる筒状の第二側壁を有するフライホイールと、前記第二側壁及び前記第二底部の少なくとも一方に固定されるクラッチ部と、を備え、前記フライホイールは、前記第二底部から前記第二側壁と反対側に向けて設けられ、前記第一底部を貫通するボス部と、前記第二底部の、前記第一底部と前記第二底部との間に形成され、前記第二側壁における径方向の外側に開口する開口部を有する凹部と、前記第二底部及び前記第二側壁の少なくとも一方の内側の面から前記凹部に向けて形成された貫通孔と、を有することを特徴としている。 In order to solve the above problems, the starting generator according to the present invention has a tubular first side wall, a yoke having a first bottom portion integrally provided with the first side wall, and an inner peripheral portion of the first side wall. A rotor having a permanent magnet provided in, a second bottom portion provided on the side opposite to the first side wall with respect to the first bottom portion, and a tubular shape extending from the second bottom portion to the opposite side to the first bottom portion. The flywheel includes a flywheel having a second side wall and a clutch portion fixed to at least one of the second side wall and the second bottom portion, and the flywheel is located on a side opposite to the second side wall from the second bottom portion. A boss portion that penetrates the first bottom portion and a second bottom portion that is formed between the first bottom portion and the second bottom portion and opens radially outward in the second side wall. It is characterized by having a recess having an opening to be formed and a through hole formed from the inner surface of at least one of the second bottom portion and the second side wall toward the recess.
　本発明に係る始動発電機において、前記第一底部は、前記第二底部の前記凹部と重なる位置に設けられた通風孔を有することを特徴としている。  The starting generator according to the present invention is characterized in that the first bottom portion has a ventilation hole provided at a position overlapping the recessed portion of the second bottom portion.
　本発明に係る始動発電機において、前記凹部は、前記第二側壁の軸方向から見て前記径方向の外側に向かうにしたがい周方向の開口幅が増加する扇形状に形成されていることを特徴としている。 The starting generator according to the present invention is characterized in that the recess is formed in a fan shape in which the opening width in the circumferential direction increases toward the outside in the radial direction when viewed from the axial direction of the second side wall. It is said.
　本発明に係る始動発電機において、前記凹部は、前記第二底部に形成された第一段部と、前記第一段部に形成され、前記第一段部よりも凹み深さの深い第二段部と、を有することを特徴としている。 In the starting generator according to the present invention, the recess is formed in the first step portion formed in the second bottom portion and the second step portion formed in the first step portion and having a recess depth deeper than that of the first step portion. It is characterized by having a step portion.
　本発明に係る始動発電機において、前記第一段部及び前記第二段部のいずれも前記開口部を有し、前記第二段部に、前記貫通孔が形成されていることを特徴としている。 The starting generator according to the present invention is characterized in that both the first stage portion and the second stage portion have the opening, and the through hole is formed in the second stage portion. ..
　本発明に係る始動発電機の製造方法は、上述した始動発電機の製造方法であって、鍛造加工及び鋳造加工のいずれかにより、前記第二側壁と前記凹部を有する前記第二底部とを形成する第一工程と、前記第一工程の後、前記第二側壁側から前記第二底部を切削することにより前記貫通孔を形成する第二工程と、を有することを特徴としている。 The method for manufacturing a starting generator according to the present invention is the above-described method for manufacturing a starting generator, in which the second side wall and the second bottom having the recess are formed by either forging or casting. It is characterized by having a first step of forming the through hole and a second step of forming the through hole by cutting the second bottom portion from the second side wall side after the first step.
　本発明によれば、工程数の増加を抑え、簡素な方法によりクラッチ機構に入り込んだスラッジを確実に外部へ排出する始動発電機及び始動発電機の製造方法を提供できる。 According to the present invention, it is possible to provide a start generator and a method for manufacturing a start generator, which suppresses an increase in the number of steps and reliably discharges sludge that has entered the clutch mechanism to the outside by a simple method.
第１実施形態に係る始動発電機の断面図。Sectional drawing of the start generator which concerns on 1st Embodiment. 第１実施形態に係るヨークの斜視図。The perspective view of the yoke which concerns on 1st Embodiment. 第１実施形態に係るフライホイールの斜視図。The perspective view of the flywheel which concerns on 1st Embodiment. 図３のＩＶ部における第二底部の上面図。Top view of the second bottom portion in the IV portion of FIG. 第１実施形態に係るフライホイールの断面図。Sectional drawing of the flywheel which concerns on 1st Embodiment. 第２実施形態に係るフライホイールの断面図。Sectional drawing of the flywheel which concerns on 2nd Embodiment. 第３実施形態に係るフライホイールの断面図。Sectional drawing of the flywheel which concerns on 3rd Embodiment.
　次に、本発明の実施形態を図面に基づいて説明する。 Next, an embodiment of the present invention will be described with reference to the drawings.
（第１実施形態）
（始動発電機）
　図１は、第１実施形態に係る始動発電機１の断面図である。
　始動発電機１は、アウタロータ型の発電機であって、エンジンの回転軸１１と一体回転する回転子２と、回転子の内側に配置される固定子１２と、回転子２と連結されてエンジンの回転軸１１と一体回転するフライホイール３と、フライホイール３の内側に配置されるクラッチ部４と、回転子２とフライホイール３とを連結する連結部材５と、を備える。 (First Embodiment)
(Starting generator)
FIG. 1 is a cross-sectional view of the starting generator 1 according to the first embodiment.
The starting generator 1 is an outer rotor type generator, and is an engine connected to a rotor 2 that rotates integrally with the rotating shaft 11 of the engine, a stator 12 that is arranged inside the rotor, and a rotor 2. A fly wheel 3 that rotates integrally with the rotating shaft 11 of the above, a clutch portion 4 arranged inside the fly wheel 3, and a connecting member 5 that connects the rotor 2 and the fly wheel 3 are provided.
（回転子）
　回転子２は、エンジンの回転軸１１と同軸な軸線Ｃを中心とする円筒状に形成されている。以下の説明において、回転子２の軸線Ｃに沿う方向を軸方向といい、軸線Ｃと直交する方向を径方向といい、軸線Ｃ回りの方向を周方向という。
　回転子２は、ヨーク２０と、ヨーク２０の内側に配置される永久磁石２１と、を備える。 (Rotor)
The rotor 2 is formed in a cylindrical shape centered on an axis C coaxial with the rotating shaft 11 of the engine. In the following description, the direction along the axis C of the rotor 2 is referred to as an axial direction, the direction orthogonal to the axis C is referred to as a radial direction, and the direction around the axis C is referred to as a circumferential direction.
The rotor 2 includes a yoke 20 and a permanent magnet 21 arranged inside the yoke 20.
　図２は、第１実施形態に係るヨーク２０の斜視図である。
　図１及び図２に示すように、ヨーク２０は、軸線Ｃを中心とする筒状の第一側壁２２と、第一側壁２２と一体に設けられるとともに第一側壁２２のエンジン側の開口を覆う第一底部２３と、を有する有底筒状に形成されている。第一側壁２２には、回転子２及び回転軸１１の回転位置を検出するための突起２２ａがプレス加工によって径方向外側に突設されている。ヨーク２０の第一底部２３は、中央に挿通孔２５を有する環状に形成されている。挿通孔２５は、軸線Ｃと同軸に設けられている。第一底部２３は、挿通孔２５の他に、第一連結孔２６と、通風孔２７と、をさらに有する。第一連結孔２６は、挿通孔２５よりも径方向外側に設けられ、第一底部２３を軸方向に貫通している。第一連結孔２６は、周方向に複数（本実施形態では６個）設けられている。通風孔２７は、周方向に複数（本実施形態では６個）設けられている。通風孔２７は、第一底部２３を軸方向に貫通している。 FIG. 2 is a perspective view of the yoke 20 according to the first embodiment.
As shown in FIGS. 1 and 2, the yoke 20 is provided integrally with the tubular first side wall 22 centered on the axis C and the first side wall 22 and covers the opening of the first side wall 22 on the engine side. It is formed in a bottomed tubular shape having a first bottom portion 23. A protrusion 22a for detecting the rotational position of the rotor 2 and the rotating shaft 11 is projected outward in the radial direction on the first side wall 22 by press working. The first bottom portion 23 of the yoke 20 is formed in an annular shape having an insertion hole 25 in the center. The insertion hole 25 is provided coaxially with the axis C. The first bottom portion 23 further has a first connecting hole 26 and a ventilation hole 27 in addition to the insertion hole 25. The first connecting hole 26 is provided radially outside the insertion hole 25 and penetrates the first bottom portion 23 in the axial direction. A plurality of first connecting holes 26 (6 in the present embodiment) are provided in the circumferential direction. A plurality of ventilation holes 27 (6 in this embodiment) are provided in the circumferential direction. The ventilation hole 27 penetrates the first bottom portion 23 in the axial direction.
　図１に示すように、ヨーク２０の第一側壁２２の内周部２４には、永久磁石２１が固定されている。永久磁石２１は周方向に複数設けられ、各永久磁石２１は周方向に磁極が交互に並ぶように着磁されている。
　永久磁石２１の径方向内側には、永久磁石２１と間隔をあけて固定子１２が配置されている。固定子１２は、例えばエンジンのケース（不図示）などに固定されている。固定子１２には不図示のコイルが巻回されている。コイルの巻線端部は、車体に搭載されるバッテリや電装部品等（いずれも不図示）に電気的に接続されている。固定子１２に対して回転子２が回転することにより、コイルに電流が発生し、バッテリへの充電や電装部品への電源の供給を行っている。 As shown in FIG. 1, a permanent magnet 21 is fixed to the inner peripheral portion 24 of the first side wall 22 of the yoke 20. A plurality of permanent magnets 21 are provided in the circumferential direction, and each permanent magnet 21 is magnetized so that magnetic poles are alternately arranged in the circumferential direction.
A stator 12 is arranged inside the permanent magnet 21 in the radial direction at intervals from the permanent magnet 21. The stator 12 is fixed to, for example, an engine case (not shown). A coil (not shown) is wound around the stator 12. The winding end of the coil is electrically connected to a battery, electrical components, etc. (all not shown) mounted on the vehicle body. When the rotor 2 rotates with respect to the stator 12, a current is generated in the coil to charge the battery and supply power to the electrical components.
（フライホイール）
　回転子２よりも軸方向のエンジン側には、フライホイール３が配置されている。フライホイール３は、軸線Ｃを中心とする筒状の第二側壁３１と、第二側壁３１のうち回転子２側の開口を覆う第二底部３２と、第二底部３２から回転子２側に突出するボス部３３と、を有する筒状に形成されている。フライホイール３の第二底部３２は、回転子２の第一底部２３と対向するとともに、第二底部３２と第二底部３２の軸方向外側の端面同士が互いに当接している。フライホイール３のボス部３３は、第二底部３２と一体形成されている。ボス部３３は、第二底部３２の中央部から回転子２側に突出し、軸線Ｃと同軸な円筒状に形成されている。ボス部３３は、回転子２の挿通孔２５に挿入されている。ボス部３３は、中央に軸挿入孔３３ａを有し、軸挿入孔３３ａの内形は、回転軸１１の先端の形状に合わせて回転子２側へ向かうにしたがい縮径するように傾斜させたテーパ孔になっている。ボス部３３に対して回転子２側に突出した回転軸１１の先端部には雄ねじ３３ｂが形成され、ボス部３３及び回転軸１１は、軸線Ｃ回りに共回りするようにナット１３で固定されている。 (Flywheel)
The flywheel 3 is arranged on the engine side in the axial direction with respect to the rotor 2. The flywheel 3 has a tubular second side wall 31 centered on the axis C, a second bottom 32 that covers the opening on the rotor 2 side of the second side wall 31, and from the second bottom 32 to the rotor 2 side. It is formed in a tubular shape having a protruding boss portion 33. The second bottom portion 32 of the flywheel 3 faces the first bottom portion 23 of the rotor 2, and the axially outer end faces of the second bottom portion 32 and the second bottom portion 32 are in contact with each other. The boss portion 33 of the flywheel 3 is integrally formed with the second bottom portion 32. The boss portion 33 projects from the central portion of the second bottom portion 32 toward the rotor 2 side, and is formed in a cylindrical shape coaxial with the axis C. The boss portion 33 is inserted into the insertion hole 25 of the rotor 2. The boss portion 33 has a shaft insertion hole 33a in the center, and the inner shape of the shaft insertion hole 33a is inclined so as to shrink in diameter toward the rotor 2 side according to the shape of the tip of the rotating shaft 11. It has a tapered hole. A male screw 33b is formed at the tip of the rotating shaft 11 protruding toward the rotor 2 with respect to the boss portion 33, and the boss portion 33 and the rotating shaft 11 are fixed with nuts 13 so as to rotate together around the axis C. ing.
　図３は、第１実施形態に係るフライホイール３の斜視図である。図４は、図３のＩＶ部における第二底部３２の上面図である。図５は、第１実施形態に係るフライホイール３の断面図である。
　図３に示すように、フライホイール３の第二底部３２は、第二底部３２から第二側壁３１側へ向かって凹む凹部３４と、第二底部３２を軸方向に貫通する第二連結孔３５及び第三連結孔４５と、を有する。
　凹部３４は、周方向に複数（本実施形態では３個）設けられている。凹部３４は、ヨーク２０の第一底部２３に設けられた通風孔２７と周方向において重なる位置に設けられている（図１参照）。凹部３４は、第二底部３２のうち回転子２の第一底部２３との合わせ面に設けられている。図４及び図５に示すように、凹部３４は、第二底部３２に形成された第一段部３６と、第一段部３６に形成され、第一段部３６よりも凹み深さの深い第二段部３７と、を有する。第一段部３６の凹み深さｈ１は、第二底部３２の板厚ｔよりも小さい（ｈ１＜ｔ）。第二段部３７の凹み深さｈ２は、第二底部３２の板厚ｔよりも大きい（ｈ２＞ｔ）。  FIG. 3 is a perspective view of the flywheel 3 according to the first embodiment. FIG. 4 is a top view of the second bottom portion 32 in the IV portion of FIG. FIG. 5 is a cross-sectional view of the flywheel 3 according to the first embodiment.
As shown in FIG. 3, the second bottom portion 32 of the flywheel 3 has a recess 34 recessed from the second bottom portion 32 toward the second side wall 31 side and a second connecting hole 35 penetrating the second bottom portion 32 in the axial direction. And a third connecting hole 45.
A plurality of recesses 34 (three in this embodiment) are provided in the circumferential direction. The recess 34 is provided at a position where it overlaps with the ventilation hole 27 provided in the first bottom portion 23 of the yoke 20 in the circumferential direction (see FIG. 1). The recess 34 is provided on the mating surface of the second bottom 32 with the first bottom 23 of the rotor 2. As shown in FIGS. 4 and 5, the recess 34 is formed in the first step portion 36 formed in the second bottom portion 32 and the first step portion 36, and has a deeper recess depth than the first step portion 36. It has a second stage portion 37. The recess depth h1 of the first step portion 36 is smaller than the plate thickness t of the second bottom portion 32 (h1 <t). The recess depth h2 of the second step portion 37 is larger than the plate thickness t of the second bottom portion 32 (h2> t).
　図４に示すように、第一段部３６は、軸方向から見て、径方向の外側に向かうにしたがい周方向の開口幅が増加する略扇形状に形成されている。
　第一段部３６は、径方向外側に向かって開口する第一開口部３６ａを有する。これにより、フライホイール３の第二底部３２と回転子２の第一底部２３とが当接して凹部３４が軸方向から塞がれた状態において、第一段部３６により形成された内部空間は、第一開口部３６ａを介してフライホイール３の外部と連通している。 As shown in FIG. 4, the first step portion 36 is formed in a substantially fan shape in which the opening width in the circumferential direction increases as it goes outward in the radial direction when viewed from the axial direction.
The first step portion 36 has a first opening portion 36a that opens outward in the radial direction. As a result, in a state where the second bottom portion 32 of the flywheel 3 and the first bottom portion 23 of the rotor 2 are in contact with each other and the recess 34 is closed from the axial direction, the internal space formed by the first step portion 36 is formed. , Communicate with the outside of the flywheel 3 via the first opening 36a.
　第二段部３７は、軸方向から見て、第一段部３６の内側に位置している。第二段部３７は、軸方向から見て、第一段部３６と相似形状に形成されている。具体的に、第二段部３７は、径方向の外側に向かうにしたがい周方向の開口幅が増加する扇形状に形成され、径方向外側に位置する扇形状の一辺と、第一段部３６の径方向外側に位置する一辺と、が同じ位置となるように形成されている。
　第二段部３７は、径方向外側に向かって開口する第二開口部３７ａを有する。第二開口部３７ａの周方向の長さ寸法は、第一開口部３６ａの周方向の長さ寸法よりも小さい。フライホイール３の第二底部３２と回転子２の第一底部２３とが当接して凹部３４が軸方向から塞がれた状態において、第二段部３７により形成された内部空間は、第二開口部３７ａを介して始動発電機１の外部と連通している。第二開口部３７ａと第一開口部３６ａとは、軸方向に連通している。
　第二段部３７のうち径方向内側の端部には、貫通孔３８が設けられている。貫通孔３８は、第二段部３７を軸方向に貫通している。貫通孔３８は、第二段部３７の凹み深さｈ２が第二底部３２の板厚よりも大きいことにより第二底部３２を貫通した孔である。すなわち、図１及び図５に示すように、貫通孔３８は、第二底部３２のボス部３３が突出する側の面から第二段部３７の底面までの距離ｈ２が、第二底部３２の内側（クラッチ部が装着される側）の面から第二底部３２のボス部３３が突出する側の面までの距離ｔよりも大きいことにより、第二側壁３１又は第二底部３２の内側の面から凹部３４に向けて開口して形成されている。また、図４に示すように、貫通孔３８は、第二段部３７のうち第二側壁３１の内周面３０よりも径方向内側に位置する領域全体に設けられている。本実施形態において、貫通孔３８は、第二段部３７の端部の形状に合わせて、軸方向から見て半円形状に形成されている。 The second step portion 37 is located inside the first step portion 36 when viewed from the axial direction. The second step portion 37 is formed in a shape similar to that of the first step portion 36 when viewed from the axial direction. Specifically, the second step portion 37 is formed in a fan shape in which the opening width in the circumferential direction increases toward the outside in the radial direction, and one side of the fan shape located on the outer side in the radial direction and the first step portion 36. Is formed so that one side located on the outer side in the radial direction of is at the same position.
The second step portion 37 has a second opening portion 37a that opens outward in the radial direction. The circumferential length dimension of the second opening 37a is smaller than the circumferential length dimension of the first opening 36a. In a state where the second bottom portion 32 of the flywheel 3 and the first bottom portion 23 of the rotor 2 are in contact with each other and the recess 34 is closed from the axial direction, the internal space formed by the second step portion 37 is the second. It communicates with the outside of the starting generator 1 through the opening 37a. The second opening 37a and the first opening 36a communicate with each other in the axial direction.
A through hole 38 is provided at the radial inner end of the second step portion 37. The through hole 38 penetrates the second step portion 37 in the axial direction. The through hole 38 is a hole that penetrates the second bottom portion 32 because the recess depth h2 of the second step portion 37 is larger than the plate thickness of the second bottom portion 32. That is, as shown in FIGS. 1 and 5, in the through hole 38, the distance h2 from the surface of the second bottom portion 32 on the side where the boss portion 33 protrudes to the bottom surface of the second step portion 37 is the second bottom portion 32. The inner surface of the second side wall 31 or the second bottom 32 is larger than the distance t from the inner surface (the side on which the clutch portion is mounted) to the surface on the side where the boss portion 33 of the second bottom 32 protrudes. It is formed by opening toward the recess 34. Further, as shown in FIG. 4, the through hole 38 is provided in the entire region of the second step portion 37 located on the inner peripheral surface 30 of the second side wall 31 in the radial direction. In the present embodiment, the through hole 38 is formed in a semicircular shape when viewed from the axial direction in accordance with the shape of the end portion of the second step portion 37.
　図３に示すように、第二連結孔３５は、周方向において隣り合う凹部３４の間にそれぞれ２個ずつ（すなわち、合計で６個）設けられている。第三連結孔４５は、周方向において、隣り合う凹部３４間に設けられた２個の第二連結孔３５の間に設けられている。すなわち、第三連結孔４５は、合計３個設けられている。 As shown in FIG. 3, two second connecting holes 35 are provided between adjacent recesses 34 in the circumferential direction (that is, six in total). The third connecting hole 45 is provided between the two second connecting holes 35 provided between the adjacent recesses 34 in the circumferential direction. That is, a total of three third connecting holes 45 are provided.
（クラッチ部）
　図１に戻って、フライホイール３の第二側壁３１の内周部には、クラッチ部４が設けられている。クラッチ部４は、第二底部３２にボルト等により固定される環状のアウターリング４３と、アウターリング４３よりも径方向内側に配置されるワンウェイクラッチ４１と、を有する。 (Clutch part)
Returning to FIG. 1, a clutch portion 4 is provided on the inner peripheral portion of the second side wall 31 of the flywheel 3. The clutch portion 4 has an annular outer ring 43 fixed to the second bottom portion 32 by bolts or the like, and a one-way clutch 41 arranged radially inside the outer ring 43.
　アウターリング４３は、フライホイール３に圧入されるとともに、第二底部３２の第三連結孔４５に挿入されたボルト等で締結されることにより、フライホイール３に固定されている。
　ワンウェイクラッチ４１は、複数の円柱状のベアリングから構成され、アウターリング４３の内周側に対して、周方向に複数配置されており、また軸方向に回転自在に支持されている。クラッチ部４には、ワンウェイクラッチ４１の内周部に支持される円筒部材と、円筒部材と一体に形成され、図示しないスタータモータの出力ギヤと噛み合うギヤ部がその外周に形成された円板部材と、からなるスタータ噛合ギヤ部４４が支持されている。 
　なお、アウターリング４３には、エンジンで発生したスラッジをワンウェイクラッチ４１から逃がすための径方向内側から外側に連通する溝等が設けられていてもよい。 The outer ring 43 is fixed to the flywheel 3 by being press-fitted into the flywheel 3 and fastened with bolts or the like inserted into the third connecting hole 45 of the second bottom portion 32.
The one-way clutch 41 is composed of a plurality of columnar bearings, is arranged in a plurality in the circumferential direction with respect to the inner peripheral side of the outer ring 43, and is rotatably supported in the axial direction. The clutch portion 4 is a disc member having a cylindrical member supported on the inner peripheral portion of the one-way clutch 41 and a gear portion formed integrally with the cylindrical member and meshing with an output gear of a starter motor (not shown) on the outer circumference thereof. The starter meshing gear portion 44 including the above is supported.
The outer ring 43 may be provided with a groove or the like that communicates from the inside to the outside in the radial direction for releasing sludge generated by the engine from the one-way clutch 41.
（連結部材）
　回転子２の第一底部２３とフライホイール３の第二底部３２とが当接された状態で、連結部材５は、第一底部２３と第二底部３２とを連結している。具体的に、連結部材５は、例えばリベット等の締結部材である。連結部材５は、第一連結孔２６及び第二連結孔３５にそれぞれ挿通されて締結（カシメ）されることにより、ヨーク２０とフライホイール３とを連結している。これにより、ヨーク２０とフライホイール３とが一体回転する。
　なお、連結部材５は、例えばボルトとナット等の締結部材でもよく、溶接や熱カシメ等により溶着される部材であってもよい。また、締結部材を用いずに、フライホイール３のボス部３３の外周面にセレーションを形成し、回転子２の挿通孔２５の内周面とボス部３３とを係合によって固定してもよい。 (Connecting member)
The connecting member 5 connects the first bottom portion 23 and the second bottom portion 32 in a state where the first bottom portion 23 of the rotor 2 and the second bottom portion 32 of the flywheel 3 are in contact with each other. Specifically, the connecting member 5 is a fastening member such as a rivet. The connecting member 5 connects the yoke 20 and the flywheel 3 by being inserted into and fastened (caulked) through the first connecting hole 26 and the second connecting hole 35, respectively. As a result, the yoke 20 and the flywheel 3 rotate integrally.
The connecting member 5 may be, for example, a fastening member such as a bolt and a nut, or a member that is welded by welding, heat caulking, or the like. Further, the inner peripheral surface of the insertion hole 25 of the rotor 2 and the boss portion 33 may be fixed by engagement by forming serrations on the outer peripheral surface of the boss portion 33 of the flywheel 3 without using the fastening member. ..
（始動発電機の製造方法）
　次に、上述した始動発電機１の製造方法について説明する。
　始動発電機の製造方法は、鍛造加工及び鋳造加工のいずれかにより、第二側壁３１と、凹部３４を有する第二底部３２と、を形成する第一工程と、第一工程の後、第二側壁３１側から第二底部３２を切削することにより貫通孔３８を形成する第二工程と、第二工程の後、フライホイール３と回転子２とを連結する第三工程と、を有する。
　本実施形態において、第一工程では、まず、鍛造加工によりフライホイール３を形成する。ここで、図５の二点鎖線で示すように、鍛造加工では、フライホイール３の第二側壁３１、第二底部３２及びボス部３３の厚みが設計値よりも大きくなるようにフライホイール３の外形を形成する。具体的に、第二側壁３１の径方向の厚み及び軸方向の長さと、第二底部３２の軸方向の厚みと、ボス部３３の径方向の厚みと、がそれぞれ設計値よりも大きくなるように形成する。また、鍛造加工の金型には、例えば凹部３４に対応する位置に凸部が設けられることにより、凹部３４を有する第二底部３２が形成される。
　第一工程が完了した状態において、第二底部３２の切削前板厚Ｔｆは、凹部３４の最大深さｈ２よりも大きい（Ｔｆ＞ｈ２）。 (Manufacturing method of starting generator)
Next, the manufacturing method of the start generator 1 described above will be described.
The starting generator is manufactured by a first step of forming a second side wall 31 and a second bottom portion 32 having a recess 34 by either forging or casting, and after the first step, a second step. It has a second step of forming a through hole 38 by cutting a second bottom portion 32 from the side wall 31 side, and a third step of connecting the fly wheel 3 and the rotor 2 after the second step.
In the present embodiment, in the first step, the flywheel 3 is first formed by forging. Here, as shown by the alternate long and short dash line in FIG. 5, in the forging process, the thickness of the second side wall 31, the second bottom portion 32, and the boss portion 33 of the flywheel 3 is larger than the design value. Form the outer shape. Specifically, the radial thickness and the axial length of the second side wall 31, the axial thickness of the second bottom portion 32, and the radial thickness of the boss portion 33 are larger than the design values, respectively. To form. Further, in the forging die, for example, a second bottom portion 32 having the concave portion 34 is formed by providing the convex portion at a position corresponding to the concave portion 34.
When the first step is completed, the pre-cutting plate thickness Tf of the second bottom portion 32 is larger than the maximum depth h2 of the recess 34 (Tf> h2).
　次に、第二工程では、フライホイール３の内径寸法を出すためにフライホイール３の第二側壁３１側から、軸方向に沿ってエンドミルや旋削バイト等の工具を挿入することにより、フライホイール３の内周部を除去加工する。具体的に、第二側壁３１の軸方向端面と、第二側壁３１の内周面３０と、第二底部３２の内側端面と、を切削する。このとき、第二側壁３１の内周面３０が、第二段部３７の径方向内側端部よりも径方向の外側に位置するまで切削する。また、第二底部３２の厚みが第二段部３７の深さ寸法ｈ２よりも小さくなるまで切削する。このように軸方向の除去加工を行うことにより、第二側壁３１の内側の空間と、凹部３４と、を連通する貫通孔３８が形成される。
　また、このとき、第二連結孔３５が切削により形成される。
　また、例えばエンドミル等による切削の後、フライホイール３のボス部３３をチャック等により固定した状態で、フライホイール３を高速回転させ、フライホイール３の内周部に工具をあてて旋削することによって、内周部を仕上げ加工しながら第二側壁３１又は第二底部３２の内側（クラッチ部４装着側）の面から凹部３４に向けて貫通孔３８を形成してもよい。
　なお、第二連結孔３５は、第一工程の鍛造加工により形成されてもよい。 Next, in the second step, a tool such as an end mill or a turning tool is inserted along the axial direction from the second side wall 31 side of the flywheel 3 in order to obtain the inner diameter dimension of the flywheel 3. The inner peripheral part of the wheel is removed. Specifically, the axial end surface of the second side wall 31, the inner peripheral surface 30 of the second side wall 31, and the inner end surface of the second bottom portion 32 are cut. At this time, cutting is performed until the inner peripheral surface 30 of the second side wall 31 is located outside the radial inner end of the second step portion 37 in the radial direction. Further, cutting is performed until the thickness of the second bottom portion 32 becomes smaller than the depth dimension h2 of the second step portion 37. By performing the removal process in the axial direction in this way, a through hole 38 that communicates the space inside the second side wall 31 and the recess 34 is formed.
At this time, the second connecting hole 35 is formed by cutting.
Further, for example, after cutting with an end mill or the like, the flywheel 3 is rotated at high speed with the boss portion 33 of the flywheel 3 fixed by a chuck or the like, and a tool is applied to the inner peripheral portion of the flywheel 3 to turn it. A through hole 38 may be formed from the inner surface (the side where the clutch portion 4 is mounted) of the second side wall 31 or the second bottom portion 32 toward the recess 34 while finishing the inner peripheral portion.
The second connecting hole 35 may be formed by forging in the first step.
　第三工程では、第一工程及び第二工程により形成されたフライホイール３と、回転子２と、を連結する。具体的に、第一底部２３と第二底部３２とを当接させ、第一連結孔２６及び第二連結孔３５に連結部材５を挿入することにより、フライホイール３と回転子２とを締結固定する。  In the third step, the flywheel 3 formed by the first step and the second step and the rotor 2 are connected. Specifically, the flywheel 3 and the rotor 2 are fastened by bringing the first bottom portion 23 and the second bottom portion 32 into contact with each other and inserting the connecting member 5 into the first connecting hole 26 and the second connecting hole 35. Fix it.
　このように、第一工程と、第二工程と、第三工程と、を経ることにより始動発電機１を製造する。
　また、第一工程の後、第二工程で第二底部３２のボス部３３側の面を切削し、第三工程でフライホイール３と回転子２とを固定した後、第二底部３２の内側（クラッチ部４装着側）の面を旋削等で加工する工程によって第二側壁３１又は第二底部３２の内側の面に貫通孔３８が成形されたフライホイール３及び回転子２を有する始動発電機１を製造してもよい。 In this way, the starting generator 1 is manufactured through the first step, the second step, and the third step.
Further, after the first step, the surface of the second bottom 32 on the boss portion 33 side is cut in the second step, the flywheel 3 and the rotor 2 are fixed in the third step, and then the inside of the second bottom 32. A start generator having a flywheel 3 and a rotor 2 in which a through hole 38 is formed on the inner surface of the second side wall 31 or the second bottom 32 by a process of processing the surface (clutch portion 4 mounting side) by turning or the like. 1 may be manufactured.
（作用、効果）
　次に、上述した始動発電機１及び始動発電機の製造方法の作用、効果について説明する。
　本発明の態様に係る始動発電機１によれば、フライホイール３の内周部にはクラッチ部４が設けられているので、例えばスタータ噛合ギヤ部４４に接続されたスタータモータ（不図示）が駆動することにより、フライホイール３が所定の方向に回転する。これにより、車両のエンジンを始動できる。また、フライホイール３の第二底部３２にはボス部３３が形成され、ボス部３３が第一底部２３を貫通するとともに連結部材５が第一底部２３と第二底部３２とを連結することにより、ヨーク２０とフライホイール３とを連結できる。これにより、フライホイール３とヨーク２０とが一体回転する。よって、ヨーク２０の内周側に配置された固定子１２に対してヨーク２０が回転することにより、車両に搭載された充電器等に充電することができる。
　第二底部３２は凹部３４を有し、凹部３４には第二側壁３１又は第二底部３２の内側の面を軸方向及び径方向に貫通する貫通孔３８が形成されているので、始動発電機１が回転した際にクラッチ部４で発生したスラッジは、図１の矢印Ａに示すように、第二底部３２の内側（クラッチ部４装着側）の面から貫通孔３８を通ってフライホイール３の凹部３４へ向かって移動する。さらに、凹部３４は径方向外側に開口する第一開口部３６ａ及び第二開口部３７ａを有するので、凹部３４に移動したスラッジは、遠心力により凹部３４の径方向外側に移動し、遠心力により始動発電機１の外部へ排出される。よって、クラッチ部４に入り込んだスラッジを確実に外部へ排出し、クラッチ部４にスラッジが滞留することによる始動発電機１の性能低下を抑制できる。
　また、凹部３４の凹み方向及び貫通孔３８の貫通方向がいずれもフライホイール３の軸方向に沿うように形成されているので、軸方向からの加工により凹部３４及び貫通孔３８を形成できる。特に、例えば第二連結孔３５等、貫通孔３８以外の孔を切削加工等によりフライホイール３に形成する場合、これらの加工と貫通孔３８の加工とを同軸で行うことができる。よって、スラッジを排出するためにフライホイール３を径方向に貫通する孔を形成する従来技術と比較して、加工設備を簡素化し、スラッジ排出用の孔を容易に形成できる。
　したがって、工程数の増加を抑え、簡素な方法によりクラッチ部４に入り込んだスラッジを確実に外部へ排出する始動発電機１を提供できる。 (Action, effect)
Next, the operation and effect of the start generator 1 and the method of manufacturing the start generator described above will be described.
According to the start generator 1 according to the aspect of the present invention, since the clutch portion 4 is provided on the inner peripheral portion of the flywheel 3, for example, a starter motor (not shown) connected to the starter meshing gear portion 44 can be used. By driving, the flywheel 3 rotates in a predetermined direction. As a result, the engine of the vehicle can be started. Further, a boss portion 33 is formed on the second bottom portion 32 of the flywheel 3, the boss portion 33 penetrates the first bottom portion 23, and the connecting member 5 connects the first bottom portion 23 and the second bottom portion 32. , The yoke 20 and the flywheel 3 can be connected. As a result, the flywheel 3 and the yoke 20 rotate integrally. Therefore, the yoke 20 rotates with respect to the stator 12 arranged on the inner peripheral side of the yoke 20, so that the charger or the like mounted on the vehicle can be charged.
The second bottom portion 32 has a recess 34, and the recess 34 is formed with a through hole 38 that penetrates the inner surface of the second side wall 31 or the second bottom portion 32 in the axial direction and the radial direction. As shown by the arrow A in FIG. 1, the sludge generated in the clutch portion 4 when 1 is rotated passes through the through hole 38 from the inner surface (the side where the clutch portion 4 is mounted) of the second bottom portion 32, and the flywheel 3 Moves toward the recess 34 of. Further, since the recess 34 has a first opening 36a and a second opening 37a that open radially outward, sludge that has moved to the recess 34 moves radially outward of the recess 34 due to centrifugal force, and is caused by centrifugal force. It is discharged to the outside of the starting generator 1. Therefore, the sludge that has entered the clutch portion 4 can be reliably discharged to the outside, and the performance deterioration of the starting generator 1 due to the sludge staying in the clutch portion 4 can be suppressed.
Further, since the recessing direction of the recess 34 and the penetrating direction of the through hole 38 are both formed along the axial direction of the flywheel 3, the recess 34 and the through hole 38 can be formed by processing from the axial direction. In particular, when a hole other than the through hole 38, such as the second connecting hole 35, is formed on the flywheel 3 by cutting or the like, these processing and the processing of the through hole 38 can be performed coaxially. Therefore, the processing equipment can be simplified and the holes for sludge discharge can be easily formed as compared with the conventional technique of forming holes penetrating the flywheel 3 in the radial direction for discharging sludge.
Therefore, it is possible to provide a starting generator 1 that suppresses an increase in the number of steps and reliably discharges sludge that has entered the clutch portion 4 to the outside by a simple method.
　ヨーク２０の第一底部２３には、凹部３４と重なる位置に通風孔２７が形成されているので、例えば固定子１２等を冷却するために送り込まれた空気が、通風孔２７を通って凹部３４へ送風され、凹部３４を介して始動発電機１の外部へ排出される。よって、固定子１２や回転子２で発生した熱を効率的に外部へ排出し、発熱による始動発電機１の性能低下を抑制できる。 Since the ventilation hole 27 is formed in the first bottom portion 23 of the yoke 20 at a position overlapping the recess 34, for example, the air sent to cool the stator 12 or the like passes through the ventilation hole 27 and is formed in the recess 34. The air is blown to the outside of the starting generator 1 through the recess 34. Therefore, the heat generated by the stator 12 and the rotor 2 can be efficiently discharged to the outside, and the performance deterioration of the starting generator 1 due to heat generation can be suppressed.
　軸方向から見て、凹部３４は、径方向内側から径方向外側へ向かうにしたがい周方向の開口幅が増加する扇形状に形成されているので、貫通孔３８を通って凹部３４内に移動したスラッジが遠心力により径方向外側へ移動しやすい。よって、遠心力によりスラッジをより確実に外部へ排出できる。  When viewed from the axial direction, the recess 34 is formed in a fan shape in which the opening width in the circumferential direction increases from the inside in the radial direction to the outside in the radial direction, so that the recess 34 moves into the recess 34 through the through hole 38. Sludge easily moves outward in the radial direction due to centrifugal force. Therefore, the sludge can be discharged to the outside more reliably by the centrifugal force.
　凹部３４は第一段部３６と第二段部３７とに分割して形成されるので、凹み深さの深い単一の凹部３４を形成する場合と比較して、凹部３４を形成する際の加工量を低減できる。よって、フライホイール３の剛性を高く維持できる。 Since the recess 34 is divided into a first step portion 36 and a second step portion 37, the recess 34 is formed when the recess 34 is formed as compared with the case where a single recess 34 having a deep recess depth is formed. The amount of processing can be reduced. Therefore, the rigidity of the flywheel 3 can be maintained high.
　第一段部３６は第一開口部３６ａを有し、第二段部３７は第二開口部３７ａを有するので、凹部３４内に移動したスラッジを開口部３６ａ，３７ａから確実に始動発電機１の外部へ排出できる。また、第一段部３６よりも凹み深さの深い第二段部３７に貫通孔３８が形成されているので、フライホイール３の加工量を削減しつつ貫通孔３８を容易に形成できる。 Since the first stage portion 36 has the first opening 36a and the second stage portion 37 has the second opening 37a, the sludge moved into the recess 34 can be reliably started from the openings 36a and 37a. Can be discharged to the outside of. Further, since the through hole 38 is formed in the second step portion 37 having a recess depth deeper than that of the first step portion 36, the through hole 38 can be easily formed while reducing the processing amount of the flywheel 3.
　本発明の態様に係る始動発電機の製造方法によれば、始動発電機の製造方法は、第一工程と、第二工程と、を有する。
　第一工程では、鍛造加工及び鋳造加工のいずれかにより、第二側壁３１と、凹部３４を有する第二底部３２と、を形成する。このように、第一工程では、鍛造加工又は鋳造加工により第二側壁３１と第二底部３２とを一括形成できる。第一工程が完了した状態で、第二底部３２には凹部３４が形成されている。よって、凹部３４を容易に形成できる。
　第二工程では、第一工程の後、第二側壁３１側から第二底部３２を切削することにより貫通孔３８を形成する。ここで、例えば第二側壁３１の内周部にクラッチ部４を配置する場合、第二側壁３１の内周部を切削により仕上げ加工する必要がある。この仕上げ加工において、フライホイール３の第二底部３２の厚みを減少させるように第二側壁３１側から切削することで、第二側壁３１側の径方向内側の空間と、第二底部３２に設けられた凹部３４と、が連通する。このようにして形成された孔を貫通孔３８とし、この貫通孔３８を介してクラッチ部４に入り込んだスラッジ等を外部へ排出できる。よって、別加工により貫通孔３８を形成する必要がなく、製造工程を簡素化できる。
　このように、第一工程及び第二工程を経ることにより、工程数の増加を抑え、簡素な方法によりクラッチ部４に入り込んだスラッジを確実に外部へ排出する始動発電機の製造方法を提供できる。 According to the method for manufacturing a starting generator according to an aspect of the present invention, the method for manufacturing a starting generator includes a first step and a second step.
In the first step, the second side wall 31 and the second bottom portion 32 having the recess 34 are formed by either forging or casting. As described above, in the first step, the second side wall 31 and the second bottom portion 32 can be collectively formed by forging or casting. A recess 34 is formed in the second bottom portion 32 in a state where the first step is completed. Therefore, the recess 34 can be easily formed.
In the second step, after the first step, the through hole 38 is formed by cutting the second bottom portion 32 from the second side wall 31 side. Here, for example, when the clutch portion 4 is arranged on the inner peripheral portion of the second side wall 31, it is necessary to finish the inner peripheral portion of the second side wall 31 by cutting. In this finishing process, by cutting from the second side wall 31 side so as to reduce the thickness of the second bottom portion 32 of the flywheel 3, the space inside the radial direction on the second side wall 31 side and the second bottom portion 32 are provided. The recess 34 and the recess 34 are communicated with each other. The hole formed in this way is designated as a through hole 38, and sludge or the like that has entered the clutch portion 4 can be discharged to the outside through the through hole 38. Therefore, it is not necessary to form the through hole 38 by another processing, and the manufacturing process can be simplified.
As described above, by passing through the first step and the second step, it is possible to provide a manufacturing method of a starting generator that suppresses an increase in the number of steps and reliably discharges sludge that has entered the clutch portion 4 to the outside by a simple method. ..
（第２実施形態）
　次に、第２実施形態の始動発電機１を図６に基づいて説明する。なお、第２実施形態の始動発電機１において、第１実施形態の始動発電機１と同一、類似部材の構成については同じ符号を付して詳しい説明を省略する。
　図６は、第２実施形態に係るフライホイール３の断面図である。
　第２実施形態では、凹部３４が第二段部３７を有さない点で上述した第１実施形態と相違している。 (Second Embodiment)
Next, the starting generator 1 of the second embodiment will be described with reference to FIG. In the starting generator 1 of the second embodiment, the same reference numerals as those of the starting generator 1 of the first embodiment and the configurations of similar members are designated by the same reference numerals, and detailed description thereof will be omitted.
FIG. 6 is a cross-sectional view of the flywheel 3 according to the second embodiment.
The second embodiment is different from the first embodiment described above in that the recess 34 does not have the second step portion 37.
　第２実施形態において、第二底部３２には凹部２３４が形成されている。凹部２３４は、第二底部３２の板厚ｔよりも凹み深さｈ３の大きい単一の段部により形成されている（ｔ＜ｈ３）。凹部２３４の径方向内側端部は、第二側壁３１の内周面３０よりも径方向内側に位置している。凹部２３４は、貫通孔２３８を有する。貫通孔２３８は、第二底部３２を軸方向に貫通している。 In the second embodiment, the recess 234 is formed in the second bottom portion 32. The recess 234 is formed by a single step portion having a recess depth h3 larger than the plate thickness t of the second bottom portion 32 (t <h3). The radial inner end of the recess 234 is located radially inside the inner peripheral surface 30 of the second side wall 31. The recess 234 has a through hole 238. The through hole 238 penetrates the second bottom portion 32 in the axial direction.
　第２実施形態の始動発電機１によれば、凹部２３４は単一の段部を有するので、凹部２３４が複数の段部を有する場合と比較して、鍛造加工の際に用いる金型の構成を簡素化できる。 According to the starting generator 1 of the second embodiment, since the recess 234 has a single step portion, the configuration of the die used in the forging process is compared with the case where the recess 234 has a plurality of step portions. Can be simplified.
（第３実施形態）
　次に、第３実施形態の始動発電機１を図７に基づいて説明する。なお、第３実施形態の始動発電機１において、第１実施形態及び第２実施形態の始動発電機１と同一、類似部材の構成については同じ符号を付して詳しい説明を省略する。
　図７は、第３実施形態に係るフライホイール３の断面図である。
　第３実施形態では、凹部３４がテーパ面を有する点で上述した第１実施形態と相違している。 (Third Embodiment)
Next, the starting generator 1 of the third embodiment will be described with reference to FIG. In the starting generator 1 of the third embodiment, the same reference numerals as those of the starting generator 1 of the first embodiment and the starting generator 1 of the second embodiment, and the same reference numerals are given to the configurations of similar members, and detailed description thereof will be omitted.
FIG. 7 is a cross-sectional view of the flywheel 3 according to the third embodiment.
The third embodiment is different from the first embodiment described above in that the recess 34 has a tapered surface.
　第３実施形態において、第二底部３２には凹部３３４が形成されている。凹部３３４は、第二底部３２の軸方向外側端面から凹部３３４の底面３３４ａに向かって徐々に凹み深さが増加するテーパ面３３９を有する。凹部３３４の底面３３４ａとテーパ面３３９との境界部分には、貫通孔３３８が形成されている。貫通孔３３８は、第二底部３２を軸方向に貫通している。 In the third embodiment, a recess 334 is formed in the second bottom portion 32. The recess 334 has a tapered surface 339 whose recess depth gradually increases from the axially outer end surface of the second bottom 32 toward the bottom 334a of the recess 334. A through hole 338 is formed at the boundary between the bottom surface 334a of the recess 334 and the tapered surface 339. The through hole 338 penetrates the second bottom portion 32 in the axial direction.
　第３実施形態の始動発電機１によれば、凹部３３４はテーパ面３３９を有するので、鍛造加工の際に金型の抜け性を向上できる。よって、製造性に優れた始動発電機１とすることができる。 According to the starting generator 1 of the third embodiment, since the recess 334 has a tapered surface 339, it is possible to improve the mold pullability during forging. Therefore, the starting generator 1 having excellent manufacturability can be obtained.
　以上、本発明の好ましい実施例を説明したが、本発明はこれら実施例に限定されることはない。本発明の趣旨を逸脱しない範囲で、構成の付加、省略、置換、およびその他の変更が可能である。本発明は前述した説明によって限定されることはなく、添付のクレームの範囲によってのみ限定される。
　例えば、上述した実施形態では、軸方向から見て凹部３４が扇形状に形成される構成としたが、これに限らない。すなわち、凹部３４は、軸方向から見て三角形状や矩形状、半円形状等、扇形状以外の形状に形成されてもよい。但し、扇形状に形成した場合は、矩形状等に形成する場合と比較して、周方向における開口部３６ａ，３７ａの幅を大きく確保できる点で優位性がある。 Although preferable examples of the present invention have been described above, the present invention is not limited to these examples. Configurations can be added, omitted, replaced, and other modifications without departing from the spirit of the present invention. The present invention is not limited by the above description, but only by the scope of the appended claims.
For example, in the above-described embodiment, the recess 34 is formed in a fan shape when viewed from the axial direction, but the present invention is not limited to this. That is, the recess 34 may be formed in a shape other than the fan shape, such as a triangular shape, a rectangular shape, or a semicircular shape when viewed from the axial direction. However, when the fan shape is formed, there is an advantage in that the widths of the openings 36a and 37a in the circumferential direction can be largely secured as compared with the case where the fan shape is formed.
　ボス部３３と第二底部３２とは別体形成されてもよい。すなわち、ボス部３３とフライホイール３とを別々に形成した後に、フライホイール３の第二底部３２にボス部３３を締結固定や圧入固定により一体化してもよい。
　上述した実施形態では、第一段部３６及び第二段部３７の両方に開口部３６ａ，３７ａが設けられた構成としたが、いずれか一方は開口部を有しなくてもよい。すなわち、第一段部３６に第一開口部３６ａが設けられた場合、第二開口部３７ａはなくてもよい。第二段部３７に第二開口部３７ａが設けられた場合、第一開口部３６ａはなくてもよい。
　凹部３４に設けられる段部の個数は、上述の実施形態に限られない。 The boss portion 33 and the second bottom portion 32 may be formed separately. That is, after the boss portion 33 and the flywheel 3 are formed separately, the boss portion 33 may be integrated with the second bottom portion 32 of the flywheel 3 by fastening and fixing or press-fitting.
In the above-described embodiment, the openings 36a and 37a are provided in both the first-stage portion 36 and the second-stage portion 37, but one of them may not have an opening. That is, when the first opening 36a is provided in the first step portion 36, the second opening 37a may not be provided. When the second opening 37a is provided in the second step portion 37, the first opening 36a may not be provided.
The number of steps provided in the recess 34 is not limited to the above-described embodiment.
　第一工程で貫通孔３８を形成してもよい。すなわち、凹部３４の最大板厚ｈ２が、切削前板厚Ｔｆよりも大きく（ｈ２＞Ｔｆ）なるように鍛造加工を行い、その後、第二工程で切削加工により貫通孔３８の孔径を拡径してもよい。
　第一工程では鋳造加工によりフライホイール３を形成してもよい。 Through holes 38 may be formed in the first step. That is, forging is performed so that the maximum plate thickness h2 of the recess 34 is larger than the plate thickness Tf before cutting (h2> Tf), and then the hole diameter of the through hole 38 is expanded by cutting in the second step. You may.
In the first step, the flywheel 3 may be formed by casting.
　その他、本発明の趣旨を逸脱しない範囲で、上述した実施形態における構成要素を周知の構成要素に置き換えることは適宜可能であり、また、上述した実施形態を適宜組み合わせてもよい。 In addition, it is possible to replace the components in the above-described embodiments with well-known components as appropriate without departing from the spirit of the present invention, and the above-described embodiments may be combined as appropriate.
１…始動発電機
２…回転子
３…フライホイール
４…クラッチ部
２０…ヨーク
２１…永久磁石 
２２…第一側壁
２３…第一底部
２７…通風孔
３１…第二側壁
３２…第二底部
３３…ボス部
３４…凹部
３６…第一段部
３６ａ…第一開口部（開口部）
３７…第二段部
３７ａ…第二開口部（開口部）
３８…貫通孔 
 
  1 ... Starting generator 2 ... Rotor 3 ... Flywheel 4 ... Clutch part 20 ... Yoke 21 ... Permanent magnet
22 ... First side wall 23 ... First bottom 27 ... Ventilation hole 31 ... Second side wall 32 ... Second bottom 33 ... Boss 34 ... Recessed 36 ... First step 36a ... First opening (opening)
37 ... Second stage portion 37a ... Second opening (opening)
38 ... Through hole

Claims (6)

  1. 　筒状の第一側壁及び前記第一側壁と一体に設けられた第一底部を有するヨークと前記第一側壁の内周部に設けられる永久磁石とを有する回転子と、
    　前記第一底部に対して前記第一側壁と反対側に設けられた第二底部及び前記第二底部から前記第一底部と反対側に延びる筒状の第二側壁を有するフライホイールと、
    　前記第二側壁及び前記第二底部の少なくとも一方に固定されるクラッチ部と、
    　を備え、
    　前記フライホイールは、前記第二底部から前記第二側壁と反対側に向けて設けられ、前記第一底部を貫通するボス部と、前記第二底部の、前記第一底部と前記第二底部との間に形成され、前記第二側壁における径方向の外側に開口する開口部を有する凹部と、前記第二底部及び前記第二側壁の少なくとも一方の内側の面から前記凹部に向けて形成された貫通孔と、を有することを特徴とする始動発電機。     A rotor having a tubular first side wall and a yoke having a first bottom portion integrally provided with the first side wall, and a permanent magnet provided on the inner peripheral portion of the first side wall.
    A flywheel having a second bottom portion provided on the side opposite to the first side wall with respect to the first bottom portion and a tubular second side wall extending from the second bottom portion to the side opposite to the first bottom portion.
    A clutch portion fixed to at least one of the second side wall and the second bottom portion,
    With
    The flywheel is provided from the second bottom portion toward the side opposite to the second side wall, and has a boss portion penetrating the first bottom portion, and the first bottom portion and the second bottom portion of the second bottom portion. A recess having an opening that opens radially outward in the second side wall and formed from the inner surface of at least one of the second bottom portion and the second side wall toward the recess. A starting generator characterized by having a through hole.
  2. 　前記第一底部は、前記第二底部の前記凹部と重なる位置に設けられた通風孔を有することを特徴とする請求項１に記載の始動発電機。 The starting generator according to claim 1, wherein the first bottom portion has a ventilation hole provided at a position overlapping the recessed portion of the second bottom portion.
  3. 　前記凹部は、前記第二側壁の軸方向から見て前記径方向の外側に向かうにしたがい周方向の開口幅が増加する扇形状に形成されていることを特徴とする請求項１又は請求項２に記載の始動発電機。 Claim 1 or claim 2 is characterized in that the recess is formed in a fan shape in which the opening width in the circumferential direction increases toward the outside in the radial direction when viewed from the axial direction of the second side wall. The starting generator described in.
  4. 　前記凹部は、
    　　前記第二底部に形成された第一段部と、
    　　前記第一段部に形成され、前記第一段部よりも凹み深さの深い第二段部と、
    　を有することを特徴とする請求項１から請求項３のいずれか１項に記載の始動発電機。     The recess is
    The first step formed on the second bottom and
    A second step portion formed in the first step portion and having a deeper recess than the first step portion,
    The starting generator according to any one of claims 1 to 3, wherein the start generator is characterized by having.
  5. 　前記第一段部及び前記第二段部のいずれも前記開口部を有し、
    　前記第二段部に、前記貫通孔が形成されていることを特徴とする請求項４に記載の始動発電機。     Both the first step portion and the second step portion have the opening.
    The starting generator according to claim 4, wherein the through hole is formed in the second stage portion.
  6. 　請求項１から請求項４のいずれか１項に記載の始動発電機の製造方法であって、
    　鍛造加工及び鋳造加工のいずれかにより、前記第二側壁と前記凹部を有する前記第二底部とを形成する第一工程と、
    　前記第一工程の後、前記第二側壁側から前記第二底部を切削することにより前記貫通孔を形成する第二工程と、
    　を有することを特徴とする始動発電機の製造方法。 
     
          The method for manufacturing a starting generator according to any one of claims 1 to 4.
    A first step of forming the second side wall and the second bottom having the recess by either forging or casting.
    After the first step, a second step of forming the through hole by cutting the second bottom portion from the second side wall side, and
    A method of manufacturing a starting generator, which comprises having.
PCT/JP2020/022069 2019-06-18 2020-06-04 Start-up generator and method for manufacturing start-up generator WO2020255730A1 (en)

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Publication number Priority date Publication date Assignee Title
EP3952070A4 (en) * 2019-03-29 2022-04-06 Honda Motor Co., Ltd. Outer rotor-type motor
WO2023189264A1 (en) * 2022-03-29 2023-10-05 株式会社ミツバ Rotating electrical machine and method for manufacturing same

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