JP5135111B2 - Motor generator and general-purpose engine - Google Patents

Description

  The present invention relates to an axial gap type motor generator and a general-purpose engine in which a motor generator is integrated.

Conventionally, an axial gap type motor generator as shown in Patent Document 1 is known. In this axial gap type motor generator, a pair of rotors are fixed to a rotating shaft while maintaining a gap. A plurality of magnets are fixed in alignment in the circumferential direction on the opposing surfaces of the pair of rotors.
A stator having a plurality of coils is fixed to the case housing the rotor, and the stator is positioned between the opposing surfaces of the pair of rotors while maintaining a non-contact state with both rotors. Yes. In the axial gap type motor generator having such a configuration, when the rotary shaft is rotated, the rotor and the stator are relatively rotated. Thereby, electromagnetic induction is generated by the magnet fixed to the rotor and the coil provided in the stator, and an induced current flows through the coil to generate power.

Japanese Patent Laying-Open No. 2005-261022

  When an axial gap motor generator as described above is externally attached to a general-purpose engine, a rotor is fixed to a rotating shaft protruding from the main body of the general-purpose engine, and a stator is attached to the main body of the general-purpose engine via a case of the motor generator. Fixed. At this time, a connecting member for connecting the case of the motor generator to the main body of the general-purpose engine is required. Thereby, the stator is attached to the main body of the general-purpose engine via the case of the motor generator and the connecting member, and the positional accuracy of the stator with respect to the rotor inevitably decreases. Thus, if the stator is not correctly attached and the stator is attached with a slight inclination with respect to the rotor, stable power generation cannot be performed and power generation efficiency is reduced. There's a problem.

  In addition, when mounting the motor generator described above, which may reduce the positional accuracy between the rotor and the stator, the amount of clearance between the rotor and the stator, i.e., between the pair of rotors, is considered in consideration of a slight mounting error. It is necessary to ensure a wide gap. This is because if the positional relationship of the stator with respect to the rotor is deviated, the rotating rotor may come into contact with the stator and break. However, if the gap between the pair of rotors is widened, not only the motor generator is increased in size, but also the lines of magnetic force generated between the rotors are weakened, and the power generation efficiency is lowered. Thus, there is a problem that the general-purpose engine is increased in size and the power generation efficiency is lowered due to the low mounting accuracy when the motor generator is mounted on the engine body.

  An object of the present invention is to improve the mounting accuracy when mounting an axial gap type motor generator to an engine body, and to improve the power generation efficiency and reduce the size.

According to a first aspect of the present invention, in a motor generator that can be attached to an output shaft of an engine body, a first rotor that can rotate integrally with the output shaft, a first rotor that is opposed to the first rotor while maintaining a gap, and the output shaft A second rotor that can rotate integrally, and a protruding portion that is disposed between the opposed surfaces of the first rotor and the second rotor so as to be separated from both rotors and protrudes in a direction perpendicular to the output shaft from the first rotor. And a support member that supports the stator so as to be fixed to the engine body, and at least one of the first rotor and the second rotor has a plurality of surfaces facing the stator. magnets are provided, a plurality of coils facing the magnet is provided in the stator, the support member includes a lockable mounting unit to the engine body, fixed to the engine body State, a support wall projecting stator side than the first rotor from the attachment portion in the radially outer side of the first rotor, is formed at the distal end located on the stator side of the support wall, the projection of the stator Any of the first rotor and the second rotor provided with an ignition magnet in the vicinity of the outer periphery, and the support member provided with the ignition magnet. A fixed wall capable of fixing an ignition coil that generates a current by a relative rotational displacement with respect to the ignition magnet is provided outside the rotor in the radial direction and facing the ignition magnet. And

According to a second aspect of the present invention, the ignition magnet is provided in the vicinity of the outer periphery of the second rotor, and a fixed wall provided in the support member protrudes from the stator toward the second rotor.
According to a third aspect of the present invention, a positioning surface that contacts the outer peripheral surface of the stator is formed on the fixed wall, and the stator is positioned by bringing the outer peripheral surface of the stator into close contact with the positioning surface. To do.
According to a fourth aspect of the present invention, the fixed wall is provided with at least a pair of positioning surfaces, and these positioning surfaces face in different directions.

A fifth invention is a general-purpose engine including an engine body and a motor generator attached to an output shaft of the engine body, wherein the motor generator includes a first rotor that rotates integrally with the output shaft, the first rotor, A second rotor that is disposed to face the air gap and rotates integrally with the output shaft, and is disposed between the first rotor and the opposed surfaces of the second rotor so as to be separated from both rotors, than the first rotor. A stator having a projecting portion projecting in a direction perpendicular to the output shaft, and a support member for fixing the stator to the engine body, and at least one of the first rotor and the second rotor includes A plurality of magnets are provided on an opposing surface facing the stator, a plurality of coils facing the magnet are provided on the stator, and the support member is the engine A mounting portion fixed to the body, in a state of being fixed to the engine body, a support wall projecting stator side than the first rotor from the attachment portion in the radially outer side of the first rotor, the support A support portion for supporting the protruding portion of the stator, which is formed at a tip located on the stator side of the wall, and an ignition magnet is provided in the vicinity of the outer periphery of either the first rotor or the second rotor. The support member generates a current due to a relative rotational displacement with the ignition magnet at a position radially outward of any one of the rotors provided with the ignition magnet and facing the ignition magnet. A fixed wall for fixing the ignition coil is provided .

According to a sixth aspect of the invention, the ignition magnet is provided in the vicinity of the outer periphery of the second rotor, and a fixed wall provided on the support member protrudes from the stator toward the second rotor.
The seventh invention is characterized in that a positioning surface that contacts the outer peripheral surface of the stator is formed on the fixed wall, and the stator is positioned by bringing the outer peripheral surface of the stator into close contact with the positioning surface. To do.
An eighth invention is characterized in that the fixed wall is provided with at least a pair of positioning surfaces, and these positioning surfaces face in different directions.

In the present invention, a plurality of magnets are fixed to the opposing surfaces of the first rotor and the second rotor. However, the plurality of magnets may be provided only in the first rotor or only in the second rotor. Also good. When a magnet is provided only in one of the rotors, it is desirable that the rotor on which the magnet is not provided is made of a magnetic material. Moreover, when providing a magnet in the opposing surface of both rotors, it is preferable to arrange | position so that the opposing surface of the opposing magnet may become a different magnetic pole.
Furthermore, the first rotor and the second rotor may function as a flywheel that stabilizes the rotation of the output shaft of the engine.

Further, the stator is fixed to the support portion of the support member using a fixing means such as a bolt, a screw, or an adhesive. Also, the mounting portion of the support member is fixed to the engine body by the same fixing means as described above. Although the support portion for supporting the stator may be only one point, in order to accurately support the stator, it is desirable to support the stator at a plurality of positions with a certain interval. In addition to this, if the contact area between the stator and the support part is increased, rattling, deformation or distortion due to long-term use and temperature changes can be reduced, and the positional relationship between the stator and the rotor can be maintained over a long period of time. Can do. Similarly, when fixing the mounting portion to the engine body, it is preferable to fix the support members at a plurality of locations.
The ignition magnet may be provided on the outer peripheral surface of the rotor or may be provided on the plane of the rotor. However, when an ignition magnet is provided on the plane of the rotor, it is appropriate to provide the ignition magnet at a position where an induction current is generated in the ignition coil, that is, in the vicinity of the outer periphery of the rotor.

According to the first to eighth inventions, since the support member that supports the stator is directly fixed to the engine body, the mounting accuracy of the support member to the engine body is high, and thus the stator is accurately positioned between the pair of rotors. Can be positioned. Therefore, the facing distance between the rotor and the stator, that is, the distance between the pair of rotors can be reduced, and the engine output shaft can be reduced in the axial direction and the power generation efficiency can be increased.
Further, since the stator is supported by the protruding portion of the stator that protrudes in a direction perpendicular to the output shaft of the engine rather than the first rotor, if the stator is slightly protruded from the first rotor, the stator is surely secured. Can be supported. By doing in this way, the radial size of the rotor in the motor generator can also be reduced.
In addition, since the ignition coil is fixed to the support member with high mounting accuracy, the ignition coil can be accurately positioned with respect to the ignition magnet provided on the rotor.

In particular, according to the second and sixth inventions, when the motor generator is attached to the engine body, the ignition coil is fixed axially outward of the output shaft of the engine from the stator. Therefore, the operation for attaching the ignition coil and the adjustment operation for adjusting the distance from the ignition coil are facilitated without being obstructed by the engine body or the stator.

In particular, according to the third and seventh inventions, since the stator is positioned by the fixed wall for fixing the ignition coil, positioning when the stator is attached to the support member is facilitated.
In particular, according to the fourth and eighth inventions, since the pair of positioning surfaces facing in different directions are provided, the positioning of the stator with respect to the support member is further facilitated, and the mounting accuracy is improved.

FIG. 1 is a side view of the general-purpose engine in an exploded state.
The general-purpose engine of the present embodiment includes an engine body 1 and an axial gap motor generator 2 (hereinafter referred to as “motor generator”) attached to the engine body 1. The engine body 1 includes an output shaft 3 that is rotated by the driving force. The output shaft portion 3a of the output shaft 3 protrudes from one side portion 1a, and the output shaft portion 3b protrudes from the other side portion 1b. I am letting. The motor generator 2 is attached to the output shaft portion 3a, and another external device can be optionally attached to the output shaft portion 3b.

  The motor generator 2 attached to the output shaft portion 3 a includes a support member 4, a first rotor 5, a stator 6, a second rotor 7, and a cooling fan 8. Of these constituent members of the motor generator 2, the first rotor 5, the second rotor 7 and the cooling fan 8 are fixed to the output shaft portion 3 a and rotate integrally with the output shaft 3. On the other hand, the support member 4 is fixed to the side portion 1 a of the engine body 1, and the stator 6 is fixed to the support member 4. As a result, the stator 6, the first rotor 5 and the second rotor 7 rotate relative to each other. First, the first rotor 5, the second rotor 7 and the cooling fan 8 which rotate integrally with the output shaft 3 are shown in FIG. Description will be made with reference to FIG.

2 is a plan view of the first rotor 5, FIG. 3 is a cross-sectional view showing the assembled state of the motor generator 2, and FIG. 4 is an exploded perspective view of the motor generator 2. However, in FIG. 4, the first rotor 5 is omitted.
As is clear from FIG. 2, the first rotor 5 is formed of a circular flat plate member, and a plurality of magnets 5a are fixed to one plane thereof at a predetermined interval in the circumferential direction. Each of these magnets 5a is arranged so that different magnetic poles are alternately directed in the axial direction (upward in the drawing) of the first rotor 5.
A through-hole 5b through which the output shaft portion 3a protruding from the engine body 1 can pass is provided at the center of the first rotor 5. Further, a plurality of ventilation holes 5c are formed in the plane of the first rotor 5 so that the outside air blown by the cooling fan 8 described later is ventilated.

  On the other hand, as shown in FIG. 3, in the assembled state of the motor generator 2, the first rotor 5 and the second rotor 7 are fixed to the output shaft portion 3a in a state where they face each other while maintaining a predetermined gap. A plurality of magnets 7 a are fixed to the second rotor 7 on the surface facing the first rotor 5 in the circumferential direction. The plurality of magnets 7 a are provided in the same number as the first rotor 5, and the arrangement and the interval between adjacent magnets 7 a are the same as those of the first rotor 5. The rotors 5 and 7 are fixed to the output shaft portion 3a so that the magnet 5a fixed to the first rotor 5 and the magnet 7a fixed to the second rotor 7 face each other. However, when the rotors 5 and 7 are fixed to the output shaft portion 3a, different magnetic poles face each other in the facing magnet 5a and the magnet 7a. As a result, a closed magnetic path is formed between the facing magnets 5a and 7a, and magnetic lines in opposite directions are alternately formed in the circumferential direction of the rotors 5 and 7.

  The second rotor 7 is integrally formed with a raised portion 7b on the surface facing the first rotor 5. The diameter gradually increases toward the first rotor 5 at the center of the raised portion 7b. The tapered through hole 7c is penetrated. The raised portion 7b is formed with a small-diameter portion 7d having a small diameter at the tip, and the periphery of the through-hole 5b of the first rotor 5 is in close contact with the outer periphery of the small-diameter portion 7d. At this time, the first rotor 5 has a surface facing the second rotor 7 in contact with the tip 7g of the raised portion 7b of the second rotor 7, and the rotors 5 and 7 are fixed by bolts or the like. Thus, the raised portion 7b of the second rotor 7 plays a role as a spacer that maintains a predetermined gap between the first rotor 5 and the second rotor 7.

In addition, the space | gap of both the rotors 5 and 7 maintained by the protruding part 7b does not have the stator 6 mentioned later with respect to the magnet 5a fixed to the 1st rotor 5, and the magnet 7a fixed to the 2nd rotor 7. It is provided so that it may be in a contact state. However, considering the power generation efficiency, it is desirable to reduce the gap as long as the stator 6 maintains a non-contact state with respect to the magnets 5a and 7a.
Then, the first rotor 5 and the second rotor 7 rotate integrally with the output shaft 3 by inserting and fixing the output shaft portion 3a protruding from the engine body 1 into the through hole 7c.
Note that a plurality of fins 7e that generate wind by the rotation of the second rotor 7 are formed on the outer periphery of the raised portion 7b in the circumferential direction. The wind generated by the fins 7e is sent to the engine body 1 side through the ventilation holes 5c of the first rotor 5.

  Further, as is apparent from FIGS. 3 and 4, the ignition magnet 9 is fixed in the vicinity of the outer periphery of the second rotor 7 on the surface opposite to the surface facing the first rotor 5. ing. This ignition magnet 9 generates a high-voltage current in an ignition coil 17 described later. The second rotor 7 is also formed with a plurality of ventilation holes 7f as in the first rotor 5.

  A cooling fan 8 is fixed to the surface of the second rotor 7 opposite to the surface facing the first rotor 5. The cooling fan 8 is provided with a plurality of fins 8b in the vicinity of the outer periphery of a circular thin plate portion 8a facing the second rotor 7, and a plurality of ventilation holes 8c are formed from the center of the fins 8b. Yes. The cooling fan 8 is fixed to the second rotor 7 so that each of the ventilation holes 8 c faces the ventilation hole 7 c of the second rotor 7. As a result, when the output shaft 3 rotates, the second rotor 7 and the cooling fan 8 rotate integrally, and the wind generated by the cooling fan 8 passes through the ventilation hole 8c and the ventilation hole 7c on the first rotor 5 side. Will be led to. In this way, wind is generated along with the rotation of the output shaft 3, and the wind is guided to the engine body 1, whereby both the rotors 5, 7, the stator 6 and the engine body 1 are cooled.

As shown in FIG. 4, the recoil pulley 10 is fixed to the center of the surface of the cooling fan 8 where the plurality of fins 8b are provided. In addition, a recoil 12 that is linked to the recoil pulley 10 is integrally provided in a case 11 that houses the motor generator 2. The recoil 12 is formed with an air inlet 12 a so that the outside air is guided into the case 10 by the rotation of the cooling fan 8.
As described above, the first rotor 5, the second rotor 7, and the cooling fan 8 are fixed to the output shaft portion 3 a that protrudes from the engine body 1, and these first rotor 5, second rotor 7, and cooling fan 8 are fixed. However, it rotates integrally with the output shaft 3. On the other hand, the stator 6 located between the opposed surfaces of the first rotor 5 and the second rotor 7 is fixed to the engine body 1 via the support member 4. Below, the structure of the support member 4 and the stator 6 is demonstrated.

FIG. 5 is a perspective view of the support member 4. The support member 4 has a flat mounting portion 4a that is fixed to the side portion 1a of the engine body 1 in a surface contact state. In the present embodiment, for the purpose of weight reduction, the shape of the attachment portion 4a is a shape obtained by cutting a part of a circle, but what is the shape and size of the attachment portion 4a as long as it does not interfere with other members? For example, a circular shape, an elliptical shape, or a rectangular shape may be used.
The attachment portion 4 a of the support member 4 is provided with four holes 13 for attachment to the engine body 1. The mounting hole 13 coincides with a screw hole (not shown) provided in the side portion 1a of the engine main body 1, and the support member 4 and the engine main body are aligned with the screw hole. 1 is fixed with a screw. Thereby, the attachment part 4a will be in a surface contact state with the engine main body 1, and the support member 4 is fixed to the side part 1a of the engine main body 1 (refer FIG. 4).
Further, a through hole 14 through which the output shaft portion 3a protruding from the engine body 1 passes is provided in the central portion of the mounting portion 4a.

Further, a support wall 4 b that is bent from the outer peripheral edge of the attachment portion 4 is formed integrally with the attachment portion 4 in the support member 4. The support wall 4b protrudes in a plurality (three in the drawing) in a direction orthogonal to the plane formed by the mounting portion 4, and the amount of protrusion, that is, the height of the support wall 4b is equal to the thickness of the first rotor 5 indicated by the dotted line in the drawing. The thickness is equal to or greater than the total thickness of 5a. That is, the support wall 4 b protrudes from the mounting portion 4 a toward the stator 6 more than the thickness of the first rotor 5 on the outer side in the radial direction of the first rotor 5. Therefore, when the stator 6 is attached to the support portion 4 c as described later, the first rotor 5 is accommodated in a non-contact state within a range surrounded by the attachment portion 4 a, the support walls 4 b, and the stator 6.
And the screw hole 15 for supporting and fixing the stator 6 is formed in the protrusion direction front end surface of the support wall 4b.

  As shown in FIG. 6, the stator 6 is formed of a circular flat plate member, and a plurality of coils 6a are aligned at a predetermined interval in the circumferential direction. A through hole 6b through which the output shaft portion 3a passes is formed in the center portion of the stator 6. The through hole 6 b is formed larger than the through hole 5 b formed in the first rotor 5 and the through hole 7 b formed in the second rotor 7. As a result, the air generated by the cooling fan 8 can easily flow from the second rotor 7 side to the first rotor 5 side, and contributes to weight reduction.

The stator 6 having the above-described configuration is fixed by aligning the hole 6d provided in the vicinity of the outer periphery with the screw hole 15 of the support portion 4c and screwing them together.
Here, as apparent from FIG. 3, the stator 6 has a larger diameter than the first rotor 5, and when the stator 6 is viewed from the first rotor 5 side, the vicinity of the outer periphery of the stator 6 is exposed. The exposed portion constitutes the protruding portion 6 c of the stator 6, and this protruding portion 6 c is supported by the support portion 4 c of the support member 4.
In the assembled state of the motor generator 2, the stator 6 is positioned between the rotors 5 and 7 while maintaining a state of being separated from the rotors 5 and 7. That is, the stator 6 faces the rotors 5 and 7 while being separated from each other. At this time, the coils 6a face the magnets 5a of the first rotor 5 and the magnets 7a of the second rotor 7. . Thereby, when both the rotors 5 and 7 rotate, the magnetic force line produced between the magnets 5a and 7a will traverse each coil 6a, and an induced current will arise in the coil 6a.

  Further, as shown in FIGS. 5 and 6, the support member 4 is integrally formed with the support wall 4 b with a pair of fixed walls 16 and 16 that protrude further toward the second rotor 7 than the stator 6. Positioning surfaces 16 a and 16 a that are in contact with the outer peripheral surface of the stator 6 are formed on the fixed walls 16 and 16. The positioning surfaces 16a and 16a play a role of positioning the stator 6 in the radial direction. When the outer peripheral surface of the stator 6 is brought into close contact with both positioning surfaces 16a and 16a, the shaft center of the stator 6 is the output shaft portion. 3a and the axes of the rotors 5 and 7 coincide. Thereby, the radial positioning of the stator 6 is facilitated, and the mounting operation can be facilitated.

  Furthermore, screw holes 16b and 16b are formed in the front end surfaces of the fixed walls 16 and 16, and the ignition coil 17 can be fixed to the fixed walls 16 and 16. FIG. 7 is a perspective view of a state where the motor generator 2 is attached to the engine body 1 and is a view in which the cooling fan 8 is omitted. As shown in this figure, the ignition coil 17 fixed to the fixed walls 16, 16 is located radially outward of the second rotor 7. Therefore, if the second rotor 7 is rotated, the ignition magnet 9 passes through a position facing the ignition coil 17, and a magnetic flux change occurs around the ignition coil 17 due to the relative rotational displacement of both. Thereby, an electric current is generated in the ignition coil 17 and the engine body 1 is started.

  FIG. 8 is a front view of the motor generator 2 as viewed from the second rotor 7 side. The ignition coil 17 is fixed to a pair of adjustment members 18, 18, and adjustment holes 18 a, 18 a formed in the adjustment members 18, 18 face the screw holes 16 b, 16 b of the fixed walls 16, 16. . However, the adjustment holes 18a, 18a are formed to have a slightly larger diameter than the screw holes 16b, 16b, and have play when screwed. As a result, when the ignition coil 17 is fixed, the distance from the ignition magnet 9 can be finely adjusted.

Next, an attachment procedure when attaching the motor generator 2 having the above configuration to the engine body 1 will be described with reference to FIG.
First, the mounting portion 4a of the support member 4 is brought into surface contact with the side portion 1a of the engine body 1, and the hole 13 of the mounting portion 4a is made to coincide with the screw hole formed in the side portion 1a, and both are screwed. Fix it. And the 1st rotor 5 (not shown) is temporarily fixed to the output shaft part 3a so that the 1st rotor 5 may be accommodated in the range enclosed by the support wall 4b of the support member 4. As shown in FIG. In this state, the stator 6 is fixed to the support member 4. At this time, the stator 6 is easily positioned by bringing the outer peripheral surface of the stator 6 into close contact with the positioning surfaces 16a and 16a. Therefore, the stator 6 can be accurately attached by various members provided in the engine body 1 even in an environment where the attaching operation is difficult.

  Then, the first rotor 5 and the second rotor 7 are integrally fixed to the output shaft portion 3 a from the outside of the stator 6 while the output shaft portion 3 a is inserted into the through hole 7 c of the second rotor 7. As described above, when the second rotor 7 is fixed to the output shaft portion 3 a, the ignition coil 17 is fixed to the fixed wall 16 of the support member 4. As already described, when the ignition coil 17 is fixed, the adjustment coil 18 moves the ignition coil 17 in the radial direction of the second rotor 7 to adjust the distance from the second rotor 7, that is, the ignition magnet 9. .

  Here, the ignition magnet 9 is not necessarily provided in the second rotor 7, and the ignition magnet 9 may be provided in the first rotor 5. However, when the ignition magnet 9 is provided on the first rotor 5, the ignition coil 17 must be fixed at a position facing the outer periphery of the first rotor 5, so that the operation of attaching the ignition coil 17 becomes difficult. This is because, in the present invention, the stator 6 is larger than the first rotor 5 located on the engine body 1 side, and therefore the stator 6 becomes an obstacle when the ignition coil 17 is attached or adjusted. Further, in the case of a general-purpose engine that is particularly required to be miniaturized, various members and wirings of the engine body 1 are located around the motor generator 2 and work in a place close to the engine body 1 is inevitably performed. It becomes difficult. Therefore, when the installation work of the ignition coil 17 is taken into consideration, it is desirable to provide the ignition magnet 9 on the second rotor 7 located outward rather than the first rotor located on the engine body 1 side.

  When the ignition coil 17 is fixed to the fixed wall 16, the cooling fan 8 and the recoil pulley 10 are fixed to the second rotor 7, the case 11 in which the recoil 12 is integrated is fixed to the engine body 1, and the motor generator 2 is fixed. Accommodate.

As described above, since the support member 4 that supports the stator 6 is directly fixed to the engine body 1 in the general-purpose engine according to the present embodiment, the mounting accuracy of the support member 4 with respect to the engine body 1 is high. The stator 6 can be accurately positioned between 5 and 7. Accordingly, it is possible to reduce the distance between the rotors 5 and 7 and the stator 6, that is, the distance between the pair of rotors 5 and 7. Can be increased.
Further, if the stator 6 is slightly larger in diameter than the first rotor 5, the stator 6 can be reliably supported, and the size of the motor generator 2 in the direction orthogonal to the output shaft 3 can be reduced. it can.

Further, in the present embodiment, the ignition coil 17 is fixed to the support member 4 with high mounting accuracy, so that the ignition coil 17 is accurately positioned with respect to the ignition magnet 9 provided in the second rotor 7. Can do.
Furthermore, the fixed wall 16 that fixes the ignition coil 17 also has a function of positioning the stator 6, and can be easily positioned when the stator 6 is attached to the support member 4.
In the above-described embodiment, the stator 6 is circular, and the positioning surface 16 a for positioning the stator 6 is an arc surface having the same curvature as the outer peripheral surface of the stator 6. In this case, it is not always necessary to provide a pair of positioning surfaces 16a. If one positioning surface is provided, a positioning function similar to the above can be exhibited. However, when the outer periphery of the stator 6 is formed, for example, in a straight line, it is desirable to provide at least a pair of positioning surfaces facing in different directions.

  In addition, the structure of the engine and the structure of the ignition coil itself are not related to the features of the present invention, so a specific description is omitted. However, these structures are not particularly limited, and any structure is possible. Even so, the present invention can be widely applied.

It is a disassembled side view of a general purpose engine. It is a top view of a 1st rotor. It is sectional drawing of the assembly | attachment state of a motor generator. It is a disassembled perspective view of a general purpose engine. It is a perspective view of a supporting member. It is a perspective view of the state where the stator was fixed to the support member. It is a perspective view of a general purpose engine. It is a front view of a motor generator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine main body 2 Motor generator 3 Output shaft 4 Support member 4a Mounting part 4b Support wall 4c Support part 5 1st rotor 5a Magnet 6 Stator 6a Coil 6c Projection part 7 2nd rotor 7a Magnet 9 Ignition magnet 16 Fixed wall 16a Positioning surface 17 Ignition coil

Claims (8)

In the motor generator that can be attached to the output shaft of the engine body, a first rotor that can rotate integrally with the output shaft, a second rotor that is disposed to face the first rotor while maintaining a gap, and can rotate integrally with the output shaft. A rotor, a stator that is disposed between the opposing surfaces of the first rotor and the second rotor and spaced apart from both of the rotors, and that has a protruding portion that protrudes in a direction perpendicular to the output shaft from the first rotor; A support member that supports the stator so as to be fixed to the engine body, and at least one of the first rotor and the second rotor is provided with a plurality of magnets on a facing surface facing the stator, The stator is provided with a plurality of coils facing the magnet, and the support member is fixed to the engine body, and the stator is fixed to the engine body. A support wall that protrudes from the mounting portion to the stator side of the first rotor on the outer side in the radial direction of the one rotor, and a support that is formed at a tip of the support wall that is positioned on the stator side and supports the protrusion portion of the stator. comprises a part, the,
An ignition magnet is provided near the outer periphery of either the first rotor or the second rotor, and the support member is radially outward of any rotor provided with the ignition magnet, A motor generator characterized in that a fixed wall capable of fixing an ignition coil for generating a current by a relative rotational displacement with respect to the ignition magnet is provided at a position facing the ignition magnet . The ignition magnet is provided in the vicinity of the outer periphery of the second rotor, and the fixed wall provided on the support member protrudes toward the second rotor side from the stator in a state of being fixed to the engine body. The motor generator according to claim 1 . 3. The positioning wall according to claim 2 , wherein a positioning surface that contacts the outer peripheral surface of the stator is formed on the fixed wall, and the stator is positioned by bringing the outer peripheral surface of the stator into close contact with the positioning surface. Motor generator. 4. The motor generator according to claim 3 , wherein the fixed wall is provided with at least a pair of positioning surfaces, and the positioning surfaces face in different directions. In a general-purpose engine including an engine main body and a motor generator attached to an output shaft of the engine main body, the motor generator is opposed to the first rotor rotating integrally with the output shaft, and maintaining a gap with the first rotor. And a second rotor that rotates integrally with the output shaft, and is disposed between the opposing surfaces of the first rotor and the second rotor so as to be separated from both rotors, and is more orthogonal to the output shaft than the first rotor. And a support member that fixes the stator to the engine body, and at least one of the first rotor and the second rotor has a facing surface that faces the stator. And a plurality of coils facing the magnet. The support member is fixed to the engine body. A mounting wall, a support wall projecting radially outward of the first rotor from the mounting section toward the stator side relative to the first rotor in a state of being fixed to the engine body, and a stator wall of the support wall A support portion that is formed at a tip that is positioned and supports the protruding portion of the stator ,
An ignition magnet is provided near the outer periphery of either the first rotor or the second rotor, and the support member is radially outward of any rotor provided with the ignition magnet, A general-purpose engine characterized in that a fixed wall for fixing an ignition coil for generating an electric current by a relative rotational displacement with respect to the ignition magnet is provided at a position facing the ignition magnet . The ignition magnet is provided in the vicinity of the outer periphery of the second rotor, and the fixed wall provided on the support member protrudes toward the second rotor side from the stator in a state of being fixed to the engine body. The general-purpose engine according to claim 5 , wherein the engine is a general-purpose engine. 7. The fixing wall according to claim 6 , wherein a positioning surface that contacts the outer peripheral surface of the stator is formed on the fixed wall, and the stator is positioned by bringing the outer peripheral surface of the stator into close contact with the positioning surface. General purpose engine. 8. The general-purpose engine according to claim 7 , wherein at least a pair of positioning surfaces are provided on the fixed wall, and the positioning surfaces face in different directions.

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