JP2579712Y2 - Flywheel magnet rotor for internal combustion engines - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel magnet rotor used as a rotor of a magnet generator mounted on an internal combustion engine.

[0002]

2. Description of the Related Art As a magnet generator mounted on an internal combustion engine, a flywheel magnet rotor having a magnet field formed by mounting a magnet on the inner periphery of a peripheral wall portion of a flywheel is often used. Further, when a non-contact type ignition device is provided in the internal combustion engine, in order to obtain a signal for determining an ignition timing, a rotor provided with a reluctor (inductor) and a magnetic flux change are given by the reluctor. An inductor-type signal generator equipped with a signal generator for inducing a signal is used,
When a flywheel magnet rotor is attached to an engine, a reluctor (inductor) is provided on the outer periphery of the flywheel, and the flywheel is also used as a rotor of a signal generator.

Further, when an engine start / start device using a starter motor as a drive source is used, a ring gear for meshing a pinion gear driven by the starter motor is fitted around the flywheel.

FIG. 3 shows a configuration of a magnet generator and a signal generator using a conventional flywheel magnet rotor. In FIG. 3, reference numeral 1 'denotes a peripheral wall portion 101' and a bottom wall portion 102.
'And a flywheel made of cast iron. A boss 103 is provided at the center of the bottom wall 102 'of the flywheel 1'.
′ Is provided, and a tapered hole 104 ′ for attaching the rotation shaft of the engine is formed inside the boss 103 ′.
The flywheel has a tapered hole 104 'fitted with a tapered portion provided at the tip of the rotating shaft of the engine.
The rotary shaft of the engine is fastened to the rotary shaft of the engine by a nut screwed into a screw portion at the tip of the rotary shaft or a bolt screwed into a screw hole provided in a shaft core at the tip of the rotary shaft.

[0005] The peripheral wall portion 101 'of the flywheel 1' is a small-diameter portion 1 located on the open end 1A 'side of the flywheel.
01A 'and a large-diameter portion 101B' located on the bottom wall side, and a ring gear 2 'for an engine starting device is pressure-fitted and attached to the outer periphery of the large-diameter portion 101B'. 'On the outer periphery of the small diameter portion 101A'
Protrusions constituting 5 'are provided. Ring gear 2 '
Are stepped portions 101 formed on the large diameter portion 101B 'of the peripheral wall portion.
It is positioned in the axial direction by a '. Surrounding wall 10
An arc-shaped permanent magnet constituting the magnet field 3 is arranged on the inner periphery of the magnet field 1 ′, and the magnet is brought into contact with a stepped portion 101 b ′ formed on the inner periphery of the peripheral wall portion 101 ′ so as to be in the axial direction. And is fixed to the inner periphery of the peripheral wall portion 101 ′ by bonding or the like. The magnets constituting the magnet field 3 are magnetized such that different magnetic poles are alternately arranged in the circumferential direction of the flywheel.
In this example, a flywheel 1 'and a ring gear 2'
And the magnet field 3 constitute a flywheel magnet rotor.

Reference numeral 4 'denotes a stator base plate fixed to a case or the like of an internal combustion engine. Armatures 5 and 6 constituting a stator of the magnet generator are mounted on the base plate 4'. Armature 5,
Reference numeral 6 denotes a power generation coil wound around an iron core having a magnetic pole portion facing the magnet field. The magnetic pole portions (not shown) of the armatures 5 and 6 provide a predetermined gap between the magnetic poles of the magnet field 3. Are opposed to each other. The power generating coil provided on the illustrated armature 5 is used, for example, as an ignition power supply for supplying ignition energy to an ignition device of an internal combustion engine, and the power generating coil provided on the armature 6 supplies power to a lighting load, a battery charging circuit, and the like. Used to supply.

A signal generator 7 constituting a stator of an inductor type signal generator is fixed to a portion near the outer periphery of the base plate 4 '. This signal emission is a well-known type including an iron core having a magnetic pole portion facing the reluctor 105 ′ at a tip, a signal coil wound around the iron core, and a permanent magnet magnetically coupled to the iron core. When the reluctor 105 'starts to oppose the magnetic pole portion of the iron core of the signal generator 7 and ends the opposition, a pulse signal having a different polarity is generated in the signal coil. This signal is used to determine the ignition timing of the internal combustion engine.

[0008]

In the conventional flywheel magnet rotor, the ring gear 2 'is disposed at a position near the end of the peripheral wall 101' of the flywheel on the side of the bottom wall 102 '. The center of gravity of the wheel magnet rotor is offset toward the bottom wall 102 '. Therefore, when the flywheel boss 104 'is connected to the tip of the rotating shaft of the engine to support the flywheel magnet rotor in a cantilever manner, the fulcrum of the rotating shaft (bearing portion of the rotating shaft of the engine) and the flywheel The distance between the center of gravity of the magnet rotor becomes longer,
There is a problem that the run-out caused by the rotation of the flywheel magnet rotor increases.

In particular, in an internal combustion engine such as an outboard motor that operates at a low speed for a long time, it is necessary to increase the mass of the flywheel to increase the inertia in order to prevent the engine from stopping. However, when the center of gravity of the flywheel magnet rotor supported by the cantilever as described above is offset toward the side distant from the fulcrum, the rotor swings larger, and a large vibration is generated when the engine is rotating at high speed, and the rotor is rotated. It may be damaged.

It is an object of the present invention to provide a flywheel magnet rotor in which the position of the center of gravity is brought closer to the fulcrum of the rotating shaft so that the run-out caused by the rotation can be reduced.

[0011]

According to the present invention, a peripheral wall portion 101 is provided.
A flywheel 1 having a cup shape and a bottom wall 102, a magnet field 3 for a magnet generator mounted on the inner periphery of the flywheel, and fitted to the outer periphery of the peripheral wall of the flywheel. A flywheel magnet rotor for an internal combustion engine including an engine starting ring gear 2 fixed to a flywheel and a signal generator reluctor 105 formed on the outer periphery of a peripheral wall of the flywheel. It was done.

In the present invention, the ring gear 2 is disposed at a position near the open end 1A of the flywheel 1.
An annular collar 106 is formed adjacent to the ring gear 2 on the outer circumference of a portion of the peripheral wall of the flywheel located between the ring gear 2 and the bottom wall 102. A relaxor 105 is formed on the outer periphery of the collar 106. In the flywheel magnet rotor according to the present invention, the term "reactor" refers to a portion that causes a change in the magnetic resistance between the signal generating electron and the iron core when the opposing core starts and ends. Are formed by protrusions or recesses protruding toward the magnetic pole of the signal emitting electrons.

[0013]

As described above, the ring gear is mounted near the open end of the flywheel, and a ring is formed on the outer periphery of the portion of the peripheral wall of the flywheel located between the ring gear and the bottom wall. By forming an annular collar portion adjacent to the gear and forming a reluctor on the outer periphery of the collar portion, the position of the center of gravity of the cantilevered flywheel magnet rotor can be brought closer to the fulcrum of the rotating shaft. . Therefore, the distance between the center of gravity of the flywheel magnet rotor and the fulcrum of the rotating shaft can be reduced, and the vibration caused by the rotation can be reduced to suppress the vibration of the rotor and increase its mechanical strength. .

[0014]

1 and 2 show a configuration example of a magnet generator and a signal generator using a flywheel magnet rotor according to the present invention. FIG. 1 is a longitudinal sectional view, and FIG. It is a top view of the principal part.

[0015] In these figures, reference numeral 1 denotes a flywheel made of cast iron.
It has a substantially cup-like shape having a bottom wall 102, and a boss 103 is provided at the center of the bottom wall 102.
A tapered hole 104 is formed inside the boss 103.

The peripheral wall portion 101 of the flywheel 1 has a small diameter portion 101A located on the side of the open end 1A of the flywheel.
And a large diameter portion 1 located closer to the bottom wall portion 102 than the small diameter portion.
01B, and a ring gear 2 on the outer periphery of the small diameter portion 101A.
Are press-fitted and mounted. Ring gear 2
Is a step 10 between the small diameter portion 101A and the large diameter portion 101B.
1a, and is positioned in the axial direction. An annular collar 106 is formed on the peripheral wall of the flywheel 1 adjacent to the ring gear 2.
Is formed on the outer periphery of each of the projections 105 in the form of projections projecting outward in the radial direction. In this embodiment, two reluctors 105 are provided at symmetrical positions separated by 180 degrees. In order to bring the center of gravity of the flywheel magnet rotor closer to the fulcrum of the rotating shaft, the flange 106 is preferably provided at the center of the peripheral wall 101 in the axial direction or at a position closer to the opening end 1A than the center.

On the inner peripheral surface of the peripheral wall of the flywheel 1,
A magnet field 3 composed of an arc-shaped permanent magnet is attached. In FIG. 1, reference numeral 107 denotes a screw hole for attaching the recoil starter to the flywheel 1 when it is necessary to enable starting of the engine by rope start.

Reference numeral 4 denotes a stator base plate fixed to the case of the engine, and armatures 5 and 6 constituting the stator of the magnet generator are fixed at a position near the center of the base plate 4. Base plate 4
The signal emitting element 7 is fixed to a position near the outer periphery of the magnetic field generating member 7, and the magnetic pole part 7 a of the signal emitting element is opposed to the reluctor 105. In this embodiment, the flywheel 1 and the ring gear 2
And the magnet field 3 constitute a flywheel magnet rotor according to the present invention, and the flywheel magnet rotor and the armatures 5 and 6 constitute a magnet generator.
Alternatively, the signal generator is constituted by the reluctor 105 and the signal generator 7.

The flywheel magnet rotor according to the present invention is suitable for use in applications requiring high inertia, such as an outboard motor. When attached to the outboard motor, as shown in FIG. 1, the tapered portion provided on the rotating shaft 8 of the outboard motor extending in the vertical direction is fitted into the tapered hole 104 of the flywheel 1, A nut 9 is screwed into a screw portion 8a provided at an upper end of the rotating shaft 8, and the nut 9 is tightened to fasten the rotor to the rotating shaft. Instead of using the nut 9, a bolt may be screwed into a screw hole provided in the shaft core of the rotating shaft 8.

In the above-described magnet generator, when the engine rotates, the magnetic flux linked to the generating coils of the armatures 5 and 6 changes with the rotation of the magnet field 3, so that the voltage is applied to the generating coils of both armatures. Is induced.

In the above signal generator, the retractor 10
When the coil 5 is opposed to the magnetic pole portion 7a of the signal generator 7, the core in which the signal coil is wound from the magnet in the signal generator 7, the reductor 105, the flywheel 1, the base plate 4, and the signal generator 7
A magnetic path returning to the magnet in the signal emitting electron via the yoke 7b is formed. Accordingly, when the reluctor 105 starts to oppose the magnetic pole portion 7a of the signal emission and ends the opposition, a change occurs in the magnetic flux linked to the signal coil, and a pulse-like signal voltage is induced in the signal coil. In order to prevent the magnetic flux linked to the signal coil from being changed by the tooth portion of the ring gear 2 and to induce noise in the signal coil, the tooth portion of the ring gear 2 and the magnetic pole portion 7a of the signal generator 7 are connected. It is preferable to make the distance between them sufficiently long.

When the engine is started, a pinion gear 10 driven by a starter motor is engaged with the ring gear 2, and the flywheel is driven to rotate by the pinion gear to start the engine.

As in the above embodiment, the ring gear is mounted so as to be offset toward the open end 1A of the flywheel, and the portion of the peripheral wall 101 where the ring gear 2 is disposed and the bottom wall 1
02 is formed adjacent to the ring gear on the outer periphery of the portion located between the annular portion 106 and the annular portion 106.
When the reluctor 105 is formed on the outer periphery of the rotor, the center of gravity of the flywheel magnet rotor can be lowered. Can be.

In the above embodiment, the flywheel magnet rotor attached to the outboard motor is taken as an example. However, the present invention can of course be applied to a flywheel magnet rotor attached to an internal combustion engine other than the outboard motor. It is.

[0025]

As described above, according to the present invention, the ring gear is mounted near the open end of the flywheel, and the reluctor is provided on the outer periphery of the collar provided adjacent to the ring gear. Therefore, the position of the center of gravity of the cantilevered flywheel magnet rotor can be brought closer to the fulcrum side of the rotating shaft. Therefore, the distance between the center of gravity of the flywheel magnet rotor and the fulcrum of the rotating shaft can be shortened, and the vibration caused by rotation can be reduced to suppress the vibration of the rotor and increase its mechanical strength. There are advantages that can be done.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment in which the present invention is applied to a flywheel magnet rotor attached to an outboard motor.

FIG. 2 is a top view of a main part of FIG. 1;

FIG. 3 is a longitudinal sectional view showing a configuration of a magnet generator using a conventional flywheel magnet rotor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flywheel 101 Peripheral wall part 102 Bottom wall part 103 Boss part 105 Retractor 106 Collar part 2 Ring gear for starting engine 3 Magnet field 7 Signal emission

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-212141 (JP, A) JP-A-58-1224075 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 21/22 H02K 21/12

Claims (1)

(57) [Scope of request for utility model registration] 1. A substantially cup-shaped flywheel (1) having a peripheral wall part (101) and a bottom wall part (102), and a magnet field for a magnet generator mounted on an inner periphery of the flywheel (1). 3) a ring gear (2) for starting the engine fitted to the outer periphery of the peripheral wall of the flywheel and fixed to the flywheel; and a signal formed on the outer periphery of the peripheral wall of the flywheel. Reactor for generator (10
5), wherein the ring gear (2) is disposed at a position near an open end (1A) of the flywheel (1), and the peripheral wall portion (101) of the flywheel is provided. A) a ring collar (106) is formed on the outer periphery of a portion located between the portion where the ring gear (2) is arranged and the bottom wall portion (102), adjacent to the ring gear; The retractor (105) is provided on the outer periphery of the collar (106).
A flywheel magnet rotor for an internal combustion engine, wherein the rotor is formed.