JPS60204247A - Magneto generator for internal combustion engine - Google Patents

Abstract

PURPOSE:To reduce the size of a magneto generator by providing a rotor for a cylindrical signal in a bore of a core of the generator, disposing a signal generator in the bore of the rotor, and opposing to a timing unit, thereby eliminating a special space for the signal generator. CONSTITUTION:A permanent magnet 2 is secured inside an iron cup 1 coupled with a crankshaft 4 of an engine, and a hollow generating coil 9 is disposed oppositely to the magnet. Further, a rotor 6 for a cylindrical signal coupled with the crankshaft 4 is disposed in the bore of the coil 9. A signal generator 11 which becomes a signal generator is disposed in the hollow portion of the rotor 6, and an inductor 6a to become a timing unit is secured to the inner periphery of the rotor 6 oppositely to the core 11a. Thus, the size of the generator can be reduced, and the shapes of the generator 11 and the timing unit 6a are not limited, and may not be formed in a special shape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnet generator for an internal combustion engine that includes a built-in signal generator.

(Prior art) As shown in Japanese Utility Model Publication No. 58-5094, in the conventional technology, a protrusion is provided on the outer periphery of the iron fence, and a signal generator is arranged so as to face this protrusion. Opposing signal generators are integrally formed with the stator core.

However, in the conventional system described above, the signal generator is placed around the outer periphery of the iron fence, so a separate space for the signal generator is required, resulting in a large size. Since the signal generators are arranged to face each other, the space between the iron fence and the crankshaft is used, so the shape of the power generation core and the shape of the signal generator can only be limited. The disadvantage is that it is difficult to

[Purpose of the invention]

In order to solve the above-mentioned drawbacks, the present invention fixes a permanent magnet to the inner circumference of an iron fence that is attached to the crankshaft of an internal combustion engine with its open end facing outward, and attaches a power generation core to the inner circumference of this permanent magnet. A cylindrical signal rotor is formed on the inner circumferential side of the power generation core, and at least a portion of the signal generator is located at a position approximately at the center of the signal rotor and facing the tip of the crankshaft. By arranging the signal generator, the signal generator is not placed on the outer periphery of the iron fence, so there is no need for a separate space for the signal generator, making it more compact. It is an object of the present invention to make effective use of the shapes of the power generation core and the signal generator so as not to limit the shapes of the power generation core and the signal generator.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

In the first embodiment shown in FIGS. 1 and 2, the iron fence 1
A hole 1a for attachment to the crankshaft 4 of an internal combustion engine is provided in the center of the bottom surface of the engine.

The crankshaft 4 has a diameter larger than the mounting hole 1a of the iron fence 1, and is provided to penetrate the side wall 14 of the internal combustion engine. Then, a spline 4a is cut at the tip of the crankshaft 4, and some peaks (or valleys) of this spline 4a are made wider (or narrower) than others for positioning. The hole 1a into which the shaft 4 is inserted has the same (slightly larger) spline shape as the spline 4a of this shaft 4.

Then, the hole 1a of the iron fence 1 is spline-coupled to the spline 4a of the crankshaft 4, and the iron fence 1 is connected with the bolt 5.
is fixed.

The permanent magnets 2 are arranged in a ring shape on the inner circumference of the iron fence 1, and are protected all around by press-fitting a thin magnet protection cover 3 that covers the inner circumference and side surfaces of the permanent magnets 2. The magnet protection cover 3 is made of a non-magnetic material, but if the plate is thin, it may be made of a magnetic material such as an iron plate. Then, adhesive is injected into the permanent magnet 2 and the magnet protection cover 3 through the adhesive application hole 1b provided in the iron fence 1, and the permanent magnet 2 and the magnet protection cover 3 are adhered and fixed to the iron fence 1. On the inner circumferential side of the permanent magnet 2, a power generation core 8 formed of laminated iron plates is attached to the stator base 7 with screws 10.
It is fixed by. Further, the power generation core 8 is formed into a ring shape having a large number of salient poles that protrude radially toward the outer periphery and face the permanent magnet 2 through a minute gap, and one salient pole has an ignition power source that constitutes the power generation coil 9. A battery charging coil 9b constituting the power generating coil 9 is wound around each of the remaining salient poles.

In addition, a crankshaft 4 is provided on the inner peripheral side of the power generation core 8.
An iron fence-shaped signal rotor 6 is fixed together with an iron fence l by bolts 5. The axial dimension of the spline 4a of the crankshaft 4 is the same as that of the iron fence l and the signal rotor 6.
The iron fence 1 and the signal rotor 6 are firmly tightened and fixed with bolts 5. A signal generation inductor 6a, which serves as a timing section, is formed on the inner peripheral open end side of the signal rotor 6. On the inner periphery of the signal rotor 6, a signal generator 11 serving as a signal generator is arranged at a position facing the crankshaft 4 and the tip of the bolt 5, which is located approximately at the center of the iron fence l.
Further, the tip of the core lla of the signal generator 11 is arranged to face the inductor 6a of the signal rotor 6 with a small gap therebetween.

The signal generator 11 includes a permanent magnet (not shown), a core lla provided in contact with one end of this magnet, and this core lla.
A signal coil (not shown) fitted to the outer periphery of a, a molded resin in which these parts are embedded and integrally molded, and a part of the part embedded in the bottom side of this molded resin to be integrated. The stay 11b is fixed to the back surface of the stator base 7 with screws 12. Also,
A hole 7a for fixing the signal generator 11 through it is formed in the approximate center of the stator base 7, and when a part of the signal generator 11 on the stay 11b side is located in the hole 7a, the signal generator 11 is inserted into the hole 7a. The opposite side of the motor 11 to the stay protrudes in the axial direction from the surface side of the stator base 7, and the tip of the core 11a protrudes radially from the side surface of the protrusion on the surface side.

Further, an opening 15a for adjusting the ignition timing is provided on the bottom surface of the generator cover 15, and a cover 17 for adjusting the ignition timing is placed over this opening 15a.
8 is attached to the generator cover 15. The hole 7a through which the mounting screw 12 of the stay 11b of the signal generator 11 is passed is formed into a long arc shape so that the mounting position of the signal generator 11 with respect to the stator base 7 can be adjusted. By loosening the screw 12 with the signal generator 17 removed, the mounting position of the signal generator 11 on the stator base 7 in the circumferential direction can be adjusted (ignition timing adjustment).

Further, on the back surface of the stator base 7, an arcuate band-shaped guide portion 7b is formed to protrude along the outer shape of the stay 11b of the signal generator ta11, so that the rotation position of the stay llb with respect to the stator base 7 can be easily guided. It is.

Next, an example of an electric circuit to which the magnet generator having the above configuration is applied will be explained with reference to FIG. 3. One end of the ignition power supply coil 9a is grounded, the other end is connected to the anode of a diode 21, and the cathode of the diode 21 is connected to one end of the ignition capacitor 22 and the anode of the ignition thyristor 23. Further, the other end of the capacitor 22 is grounded via the primary coil 24a of the ignition coil 24, and the cathode of the thyristor 23 is also grounded. Further, one end of the secondary coil 24b of the ignition coil 24 is connected to the capacitor 22 and one end of the secondary coil 24b.
It is connected to the connection point with the secondary coil 24a, and the other end is grounded via the spark plug 25. One end of the signal coil of the signal generator 11 is grounded, the other end is connected to the anode of a diode 26, and the cathode of the diode 26 is connected to the gate of the thyristor 23. A resistor 27 is connected between the gate and cathode of the thyrisk 23, and a diode 28 is connected in parallel between the terminals of the ignition power source coil 9a.

Further, both ends of the battery charging coil 9b are connected to a battery 30 via a full-wave rectifier 29.
Although not shown, loads such as a valve drive motor and a lamp that control the opening area of the intake and exhaust holes of a two-stroke internal combustion engine are connected to the terminal 0, for example.

For example, if the magnet generator having the above configuration has a 12-pole magnetized magnet 2, when the iron fence l directly connected to the crankshaft 4 of the internal combustion engine rotates, the deintercalating magnetic flux from the magnet 2 will be transferred to the iron fence. As it changes with the rotation of 1,
Ignition power supply coil 9a and battery charging coil 9b
, six cycles of AC voltage are generated per rotation of the iron fence 1, and the signal generator 11 has an inductor 6a for timing signals.
When the core lla faces the core lla, one cycle of alternating current voltage is generated.

Then, the ignition capacitor 22 is charged via the diode 21 with the positive half wave generated in the ignition power supply coil 9a,
The negative half-wave is short-circuited via diode 28. and,
The positive pulse generated in the signal generator 8 at the ignition timing is
By applying the voltage between the gate and cathode of the ignition thyristor 23 via the diode 26, the ignition thyristor 23 becomes conductive, causing the charge in the ignition capacitor 22 to be rapidly discharged to the primary coil 24a of the ignition coil 24. , generate a high voltage in the secondary coil 24b of the ignition coil 24,
An ignition spark is supplied to the ignition plug 25.

Further, the output of the battery charging coil 9b serves as a power source for charging the battery 30 via a low voltage power supply circuit or rectifier 29.

According to the magnet generator having the above configuration, the signal rotor 6 is tightened and fixed to the crankshaft 4 by the bolt 5 with only the head of the bolt 5 protruding from the inner bottom of the signal rotor 6, and the signal generator is generated. The generator 11 is disposed at a position facing the crankshaft 4 located approximately at the center of the signal rotor 6 and the tip of its bolt 5, and the core ll of the signal generator 11 on the inner periphery of the signal rotor 6. Since the signal generating inductor 6a is formed at a position facing the tip, almost the entire space inside the signal rotor 6 can be effectively utilized without being obstructed by the crankshaft 4, and small diameter signals can be generated. rotor 6
A signal generator 11 can be placed within.

FIG. 4 shows a second embodiment of the present invention, in which a weight or ring gear 19 is brought into contact with the bottom surface of the opposite end of the iron fence l, and the ring gear 19 is caulked and fixed with a rivet 19a. Since the iron fence 1 and the ring gear 19 are integrally fixed to the crankshaft 4 with bolts 5, it is possible to provide an iron fence with a large moment of inertia.

Further, the iron fence 1 and the ring gear 19 may be fixed by welding or by forming irregularities on the iron fence 1 and the ring gear 19, respectively, instead of using rivets. Further, the insertion hole of the ring gear 19 into the crankshaft 4 also has the same spline shape as the spline 4a of the crankshaft 4.

In the first and second embodiments, the iron fence 1 and the signal rotor 6 are provided separately, but as shown in the third embodiment in FIG. A cylindrical portion 6C having a diameter that can be inserted may be provided, this cylindrical portion 6C may be used as a signal rotor, and two windings of magnets may be attached to the inner peripheral surface of the iron @11 to integrally form the iron fence and the signal rotor. Then, the iron fence 1 is fixed to the holding member 20 with clips 20a, etc., and the mounting hole of the crankshaft 4 of the holding member 20 is made into a spline shape, and is spline-coupled to the spline 4a of the crankshaft 4. Further, since the iron fence 1 and the signal rotor 6C can be easily formed integrally from one iron plate by drawing or the like, it does not require many man-hours and can be made at low cost.

Also, as shown in the second and third embodiments, instead of the inductor formed on the inner peripheral open end side of the signal rotor 6,
A magnet 6b may also be attached. By doing so, the signal generator 11 does not need to have a built-in magnet, so it can be made smaller, and a plurality of signal generators 1 can be installed in the signal rotor 6. Further, the magnet 6b rotates in accordance with the rotation of the crankshaft 4, and the polarity of the magnet 6b is made to alternately face N and S to the signal generator 11 due to the rotation of the magnet 6b, thereby increasing the signal output. If the magnets 6b are arranged in a ring shape on the inner peripheral open end side of the signal rotor 6, the signal waveform can be easily changed by changing the magnetization pattern of the magnets 6b.

Furthermore, as shown in the second and third embodiments, in order to hold the power generation core 8 around which the power generation coil 9 is wound and the signal generator 11, a holding portion is formed on the side of the iron fence 1 of the generator cover 15. The portion 15a may be integrally formed, and the power generation core 8 and the signal generator 11 may be fixed to the holding portion 15a with screws 10 and 12 or the like. By doing so, the number of parts of the stator base can be reduced.

As shown in FIG. 2 in the first embodiment, the power generation core 8
Because the outer diameter of the iron fence 1 cannot be made smaller due to the location of the mounting holes for the screws 10 when fixing it to the stator base 7, the outer diameter of the iron fence 1 cannot be made smaller. By providing holes for mounting the screws 10, the outer diameter of the iron fence 1 can be made small and the moment of inertia of the iron fence 1 can be lowered.

Furthermore, instead of using a signal generator, it is also possible to use a magnetic signal generator made up of a Hall element or a magnetoresistive element, or a photoelectric signal generator made up of a photoelectric element. A contact type signal generator consisting of a breaker that is opened and closed by an inner cam formed on the inner peripheral surface of the rotor 6 may also be used.

Further, the structure for fixing the magnet 2 to the iron fence 1 may be fixed with screws or the like without using adhesive, or may be embedded in aluminum or resin and fixed to the iron fence 1 integrally. Further, a magnetic pole piece may be fixed to the outer surface of the magnet 2.

Further, in each of the embodiments described above, the iron fence 1 and the signal rotor 6 are tightened and fixed to the crankshaft 4 by the bolts 5, but instead of providing a tapped hole in the crankshaft 4, the crankshaft 4 Iron fence 1 from the tip of
The iron fence 1 and the signal rotor 6 may be tightened and fixed to the crankshaft 4 by providing a male threaded portion protruding from the inner bottom through the mounting hole 1a and tightening a NAND to this male threaded portion. In this case, the signal rotor 6 is fixed to the reflux shaft 4 by nuts only at the nuts and the externally threaded portions.

Furthermore, in the case where the bolt 5 is used to tighten and fix the iron fence l and the signal rotor 6 to the crankshaft 4, the bolt 5 is used at the center of the head instead of forming a hexagonal part on the outer periphery of the head. Alternatively, a hexagonal hole may be used for tightening to insert a hexagonal wrench.

In the first embodiment shown in FIG.
The stator base 7 is fixed to the generator cover 15 from the iron fence 1 side with screws 13, but a protrusion holding part is provided on the end of the stator base 7 on the iron fence 1 side from the generator cover 15, The stator base 7 may be fixed to this protrusion holding portion from the ignition timing adjustment cover 17 side with screws or the like.

At this time, the holes in the stator base 7 into which the screws are inserted are made long so that the stator base 7 can be rotated. By doing so, the ignition timing can be easily controlled by simply removing the ignition timing adjustment cover 17 and rotating the stator base 7.

〔Effect of the invention〕

As described above, the present invention includes an iron fence that is attached to the crankshaft of an internal combustion engine with the open end facing outward, a permanent magnet fixed to the inner circumference of the iron fence, and a permanent magnet fixed to the inner circumference of the permanent magnet. The power generation core arranged, the power generation coil attached to this power generation core, the cylindrical signal rotor placed on the inner circumferential side of the power generation core of the iron fence, and the signal rotor located approximately at the center of the signal rotor. The signal generator is provided at least partially at a position facing the tip of the crankshaft, and the timing unit is located at a position facing the signal generator on the inner periphery of the signal rotor. Since the signal generator is not placed on the outer periphery, it does not require a separate space for the signal generator and can be made smaller, and the space inside the cylindrical signal rotor is used for arranging the signal generator. Therefore, there is an effect that the shapes of the power generation core and the signal generator are not limited to each other, and there is no need to make them into special shapes.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a first embodiment of the generator of the present invention, FIG. 2 is a plan view showing the configuration of the stator side in the first embodiment of the generator of the present invention, and FIG. An electric circuit diagram showing an example of an electric circuit to which the first embodiment is applied, and FIGS. 4 and 5 are vertical cross-sectional views of the second and third embodiments of the generator of the present invention. ■...Iron fence, 2...Permanent magnet, 4...Crankshaft, 6...Signal rotor, 6a, 5b...Inductor forming the timing section, magnet, 8...Power generation core , 9
...Generating coil, 9a...Ignition power supply coil, 9b
...Battery charging coil, 11...Signal generator serving as a signal generator. Representative Patent Attorney Takashi Okabe Figure 1 Figure 4 Figure 5

Claims (1)

[Claims] (11- An iron fence attached to the crankshaft of an internal combustion engine with its open end facing outward, a permanent magnet fixed to the inner periphery of the iron fence, and a permanent magnet fixed to the inner periphery of the permanent magnet. A power generation core arranged, a power generation coil attached to the power generation core, a cylindrical signal rotor provided on the inner circumferential side of the power generation core of the iron fence, and a substantially central position within the signal rotor. A signal generator, at least a portion of which is disposed at a position facing the tip of the crankshaft, and a timing section provided at a position facing the signal generator on the inner periphery of the signal rotor. (2) The signal rotor is provided separately from the iron fence,
The magnet generator for an internal combustion engine according to claim 1, wherein the signal rotor and the iron fence are integrally attached to a crankshaft. (3) The magnet generator for an internal combustion engine according to claim 1, wherein the signal rotor is formed integrally with the iron fence.