CN1005424B - Signal generator for ignition of internal combustion engines - Google Patents

Abstract

The present invention relates to an ignition signal generator used for an internal-combustion engine, which comprises a rotor and stators, wherein the rotor comprises a cylindrical magnet polarized in an axial direction and two disk-shaped magnetic pole plates arranged on both end surfaces of the cylindrical magnet so as to form a south magnetic pole and a north magnetic pole, and the stators clamp the two magnetic pole plates in the middle; one end of each stator faces the north poles of the magnetic pole plates, the other end faces the south poles of the magnetic pole plates, and a middle pole rod is wound with a pulser coil. The two disk-shaped magnetic pole plates have step segments which are formed from one segment of circumference with an outside diameter bigger than the outside diameter of the cylindrical magnet and one segment of circumference with an outside diameter smaller than the outside diameter of the cylindrical magnet, and the step parts on the circumferences of the two magnetic pole plates are connected in a transition mode by a gradually changed curve.

Description

Signal generator for ignition of internal combustion engines

The present invention is related to a kind of signal generator for ignition that is used for internal-combustion engine, and is particularly relevant with internal-combustion engine that can adapted rotating magnetic field magneto.

According to a kind of known devices, the device that is proposed as US Patent specification 3799137, magnet becomes on the axle that is fixed on the internal-combustion engine rotation cylindricly, excircle along cylinder-shaped magnet is being fixed pulse oscillator, the disk magnetic-pole of moving together with magnet produces output signal in pulse oscillator, these output signals are being controlled ignition circuit.

But,, and opposite each other as the semi-round ring shape permanent magnet of excitation source in said apparatus along diametrical magnetization, be arranged to cylindric.In addition, discoidal magnetic pole only is contained on the side surface, with drive pulse generator.Have again, with only a be added to side surface of this magnet of semicircle magnet shape magnetic pole much at one, to form the gap between the arctic and the South Pole, thereby make induced flux in the pulser coil be subjected to the influence in this gap and reverses direction, and, at the intermediate portion of each pole plate circumference, promptly the strongest position, magnetic field between south poles produces normal fire signal by pulse oscillator.Yet in this example, between twice normal fire signal, when the induction field in the pulser coil is subjected to the effect in above-mentioned gap and when turning to, pulser coil will produce and the synchronous noise signal of normal ignition signal.Its result produces misoperation when igniting.

Further from the structure angle, semicircle magnet is not easy to fitting operation and magnetization is handled.Owing to could be fitted together the two halves group of magnets with very big strength, also make reliability decrease.

According to the existing signal generator for ignition of internal combustion engines of another kind, introduce as No. 3715650 patent specifications of the U.S., magnetized vertically semi-round ring shape magnet arrangements becomes cylinder to form, on its two end surfaces, be all the pole plate of semi-round ring shape on the closed assembly, to form the gap between south poles.The magnetic flux of pulse oscillator two interpolars is owing to the existence in this gap changes, thereby obtains output signal.But this device also has and the above-mentioned No. 3799137 same shortcomings of U. S. Patent device, and because used two semi-round ring shape magnet, its structure is more complicated.Furtherly, need increase to be divided into four pole plate of two groups.Its result, this structure almost can't be resisted the centrifugal force that runs up and produced, and this is an important disadvantages in actual applications.

Purpose of the present invention will provide a kind of signal generator for ignition of internal combustion engines exactly, and the sort signal generator can produce the voltage signal of basic elimination mis-ignition.

In order to achieve the above object, signal generator for ignition of internal combustion engines of the present invention has adopted novel rotor and stator.The structure of its rotor comprises: Ji Hua cylinder-shaped magnet and being contained on the two ends of this cylinder-shaped magnet vertically constitutes two disc pole plates of south poles.Stator is installed like this; Each stator is clipped in the middle above-mentioned two pole plate, and an end of each stator is facing to arctic of pole plate, and another is facing to the South Pole of pole plate, and the centre of stator is then around the coil of pulse oscillator.Here, the most important thing is on every of two disk magnetic-pole plates the different ladder section of diameter is arranged all.In other words, disk magnetic-pole plates is dimeric, and the external diameter of a part is greater than the external diameter of cylinder-shaped magnet.Then less than the external diameter of cylinder-shaped magnet, the formed circumferential ladder in two-part joint is by curve transition for the external diameter of another part.

Therefore, along with the rotation of rotor, when pulser coil arrived pole plate excircle transition section, the change of magnetic flux was very slow, but the direction in the magnetic field of inducting in pulser coil takes a turn for the worse.Therefore, can prevent from the voltage waveform that this produces constantly to occur output voltage with normal ignition signal same polarity.

As mentioned above, according to the present invention, can eliminate the output error of pulse oscillator.So-called output error is meant, in the normal ignition signal that regularly takes place by normal ignition, is mixed with the undesired signal with the normal signal same polarity.And this mistake is inevitable in the signal generator for ignition of internal combustion engines of traditional form.

Fig. 1 is the sectional elevation that is equipped with according to the magnetogenerator of signal generator for ignition of the present invention.

Fig. 2 is the longitudinal section of magnetogenerator shown in Figure 1;

Fig. 3 is the stereogram of pulse oscillator rotor;

Fig. 4 is the front view of pulse oscillator rotor shown in Figure 3;

Fig. 5 is the exploded perspective view of pulse oscillator rotor shown in Figure 3;

Fig. 6 is a stereogram, the arrangement of the disk magnetic-pole plates in the presentation graphs 3;

Fig. 7 is the stereogram of pulse oscillator stator;

Fig. 8 is the exploded perspective view of stator shown in Figure 7;

Figure 9 shows that the magnetic circuit in the pulse oscillator fuse;

Figure 10 shows that magnetic flux waveform and output voltage waveforms in the pulse oscillator.

Consult Fig. 1 and Fig. 2, index numeral 1 is represented the output shaft of internal-combustion engine.On the converging transition 1A of this output shaft one end, fixing cylindrical center sleeve 2 with nut 3.The wheel disc middle part of the cup-shaped flywheel 4 of steel uses the rivet of being represented by index numeral 5 on the flange plate 2A of sleeve 2.

On the circumference of flywheel 4 internal faces, some radially permanent magnets 6 of polarization are housed, constitute several to the staggered magnetic pole of polarity.On the inner circumference wall of every block of permanent magnet 6, respectively adorn between 7, two pole plates 7 of two pole plate and circumferentially leaving at interval.With of the inner circumferential surface face-off of engine housing 14 coaxial mounted stators 9, keep a little gap each other with permanent magnet 6.Constituting of stator 9: ring core body 9A has a plurality of radially outstanding magnetic pole 9B above.On each magnetic pole respectively around the coil 10 of the usefulness that charges a battery with as the coil 10A of ignition system power supply.Flywheel 4, cylindrical central sleeve 2, and pulse oscillator rotor 11 constitute unified rotating member jointly.

On the excircle of cylindrical central sleeve 2, pulse oscillator rotor 11 is housed, its structure as shown in Figure 3, its effect is to produce fire signal.Stator 12 is fixed on the engine housing 14 by base 13, and stands facing each other with rotor 11.As seen from Figure 5, constituting of pulse oscillator rotor 11: be bordering on discoidal pole plate 16,17, be contained in respectively on the both ends of the surface of cylinder-shaped magnet 15; This cylinder-shaped magnet 15 is along radial polarization, and is enclosed within on the sleeve of making of nonmagnetic metal 18; Sleeve 18 1 ends have locating flange 18A, and entire sleeve 18 is as the axle of rotor 11.The circumference of pole plate 16,17 is made up of small circle ring section 16A, 17A and large circle section 16B, 17B.The diameter of small circle ring section 16A, 17A approximates the external diameter of cylinder-shaped magnet 15, and large circle section 16B, 17B have occupied the circular arc that is slightly larger than semicircle, and protruding.In a side of disk magnetic-pole plates 16,17, the ladder 16C that falls suddenly is connected large circle section and small circle ring section with 17C, and big small circle ring then is the semicircle transition that is approximated ladder height by radius in the connection of opposite side, forms ladder 16D and 17D.Differ 180 degree circular arcs between ladder 16D, 17D and ladder 16C, the 17C.

Pole plate is installed at 16,17 o'clock, makes the step surface of ladder position 16C and 17C opposed mutually, it extends axially distance between centers of tracks and is decided to be 1(Fig. 3).But at opposite side, i.e. the position of ladder 16D and 17D.Two pole plate 16,17 are in axially phase lap friendship.Then see Fig. 5, pole plate 16 installs on the sleeve 18, and limits its axial position by flange 18A.Then, on sleeve 18, adorn cylinder-shaped magnet 15, load onto another pole plate 17 at last, thereby constitute pulse oscillator rotor 11.Above-mentioned these other parts all tightly are attached to together with tackiness agent.

Fig. 6 represents the mutual alignment relation between pole plate 16 and 17.

Pole plate 16 respectively comprises the flat disc that radius is identical with 17, that is to say, has equal maximum radius on the position of ladder 16C and 17C.In pole plate state shown in Figure 6, pole plate 17 is spent around simultaneously rotating about 180 with the perpendicular axis of C-C ' line and L-L ' axle, just be in shown in Figure 3 to configuration state with pole plate 16.At state shown in Figure 3, form spacing 1 between two ladder surface 16C and the 17C.But, this spacing 1 can not have yet.In other words, the ladder position 16C of two pole plate and 17C also can be arranged to the state of axial bracing.But, if be in this friendship state of taking, take the condition that the length 1 of handing over section must satisfy 1≤L so, wherein L represents that center piece 21 upper edges of fuse extend axially the width of part, see Fig. 8.As for taking of ladder position 16D and 17D hand over length 1 ', also must satisfy 1 ' 〉=condition of L ', here, L ' represent among the center pole 21 of stator 12 and both sides pole 19B or the 19C spacing of any, as shown in Figure 9.

Consult Fig. 7 and Fig. 8, the fuse 19 of stator is by the magnetic steel plate drawing that slightly is the U type, shown in Fig. 8 A.The base portion 19A of stator core 19 turns up straight up, an equidirectional with it flank end 19B in addition who turns up up, and opposite side tip extension 19C promptly rolls over the integral body of coming magnetic poles so downwards then in the opposite direction.Between flank pole plate 19B and 19C, insert the center pole 21 of T shape, around the pulser coil 20 of solid cylindricality, the rear end of center pole 21 and stator core 19 are connected above.As the pulser coil 20 of the basic element of character, wrap up with synthetic resin the outside, only exposes the front end of center pole 21.Magnetic pole post 21 length of extension vertically approximates spacing after disk magnetic-pole plates 16 and 17 is installed.

Stator 12 is fixed on the base 13 by bolt 23, and as depicted in figs. 1 and 2, pole plate 19B, 19C and 21 form E shape, with the external peripheral surface face-off of pulse oscillator rotor 11.

Fig. 9 A represents flywheel and pulse oscillator rotor 11 state along with engine revolution, and this moment, arctic N was near the pole plate 19B and the center pole 21 of stator core 19, and South Pole S is near pole plate 19C.This state changes the state of South Pole S near center sheet-pile 21 subsequently into, shown in Fig. 9 B.At this moment, undergo mutation, thereby produce an output voltage by coil 20 by the magnetic flux direction of pulser coil 20.This output voltage changes along with the change of magnetic flux, shown in Figure 10 A and Figure 10 B.That is to say, when ladder position 16C, 17C arrive center pole 21 positions of stator 12, in pulser coil 20, induce a normal ignition signal voltage 30.In addition, when ladder position 16D and 17D arrive pole 21 positions, center, cause that magnetic field polarity becomes a full member from negative, shown in Figure 10 A, at this moment, in pulser coil 20, also can induce a pair of pulse output signals 33 anti-phase with pulse signal 30.By the pulse that ladder section 16D and 17D produce, the same point of its waveform with the pulse shape that is produced by ladder section 16C and 17C.If keep spacing 1 at these corresponding mutually ladder positions, will produce and the identical positive disturbing pulse of negative impulse Final 32 degree on the phase place of negative 32 halftimes of small-pulse effect so.Fortunately, according to the present invention, ladder section 16D and 17D are the forms of arc transition, and as shown in Figure 4, therefore, the variation of magnetic flux is very slow, thereby handle is very little value with the synchronous interference voltage signal suppressing of normal ignition signal.

Fig. 3 has second ladder section 16D and the 17D in the embodiment that Fig. 6 introduced.But on the excircle of disk magnetic-pole plates 16,17, except the first ladder section 16C, 17C, other parts also can adopt the curve that gradually changes, and needn't make ladder section 16D and 17D, still can obtain the output pulse waveform same with Figure 10.

Among the embodiment that Fig. 9 introduced, the pulse oscillator stator is E shape.But according to the present invention, the two can save one arbitrarily pole plate 19B and 19C.In other words, can adopt the pulse oscillator stator of U-shaped.

According to the abovementioned embodiments of the present invention, in the ignition circuit of capacitor charge and discharge formula, the disturbing pulse voltage that does not have high value is added on the thyristor, even under the high speed operation situation, does not also have the mis-ignition phenomenon.Have only normal signal voltage 30 could in spark coil, produce high voltage, and in the high engine speeds operation process, can produce ignition energy reliably all the time.

Furtherly, according to the present invention, pulse oscillator rotor 11 is made up of cylinder-shaped magnet 15 and disk magnetic-pole plates 16,17, and structure is very simple.Therefore, can be with very high efficient manufacturing and assembling pulse oscillator rotor, and the spacing 1 between can two pole plate of regulated at will.

Above-mentioned each other parts are all made ring, and install coaxially with the sleeve 18 as axle.Even action of centrifugal force when therefore being subjected to high rotating speed, the intensity of pulse oscillator rotor is also very stable, and reliability increases.

Claims (13)

1, a kind of signal generator for ignition that is used for internal-combustion engine, comprising:

A cylindrical central sleeve (2), this sleeve are contained in the wheel disc middle part of flywheel (4) and form a rotor, and at least one magnet (11) is housed on its outer wall, and stator (12) keeps certain interval each other facing to magnet (11); Also comprise core body (19) and can be by the pulser coil (20) of at least one magnet (15) excitation.

It is characterized in that:

The cylinder-shaped magnet of a single auxiliary polarization (15) is contained on the periphery of intermediate portion (18).Two discoid pole plate (16,17) that form north and south poles are contained on two end faces of magnet (15);

The stator core (19) relative with pole plate (16,17), with the pole plate (17) of one end (19E) facing to the formation arctic, with the pole plate (16) of its other end (19C) facing to the formation South Pole, and middle pole (21) is arranged, pulser coil 20 is on this pole;

Pole plate (16,17) is between first segmental arc (16B, 17B) and second segmental arc (16A, 17A), form the first ladder section (16C, 17C), wherein the diameter of first segmental arc (16B, 17B) is greater than the external diameter of magnet (15), the diameter of second segmental arc (16A, 17A) is less than the diameter of first segmental arc (16B, 17B), the first ladder section (16C, 17C) is connected with curved section (16A, 16B, 17A, 17B), and these curved sections gradually change along the periphery of pole plate (16,17).

2, signal generator for ignition of internal combustion engines as claimed in claim 1 is characterized in that on the disk magnetic-pole plates (16,17) that the above-mentioned first ladder section (16C, 17C) is from axially seeing toward each other, and the second ladder section (16D, 17D) is then axially overlapping.

3, signal generator for ignition of internal combustion engines as claimed in claim 1, it is characterized in that: two are discoidal pole plate (16,17) and locate to have equal maximum diameter at above-mentioned first ladder (16C, 17C), and wherein a pole plate (17) is around turning about 180 degree perpendicular to the straight line of two pole plate (16,17) medial axis L-L ' and straight line C-C ' simultaneously.Make it opposed mutually with pole plate (16).

4, signal generator for ignition of internal combustion engines as claimed in claim 1, it is characterized in that: each stator core (19) is for E shape and comprise side pole post (19B), side pole post (19C), form with the middle pole (21) that forms intermediate portion, side pole post (19B) and disc pole plate (16,17) north magnetic pole on the excircle is mutually opposed, side pole post (19C) is mutually opposed with the south magnetic pole on the excircle, middle pole (21) then is positioned at both sides pole (19B, 19C), and mutually opposed with the excircle of magnet (15), pulser coil (20) is on middle pole (21).

5, signal generator for ignition of internal combustion engines as claimed in claim 1, it is characterized in that: each stator core (19) is for U-shaped and comprise a side pole post and main pole post (21) that one forms intermediate portion is formed, on the main pole post (21) also around pulser coil (20).

6, signal generator for ignition of internal combustion engines as claimed in claim 1, first ladder wherein (16C, 17C) is axially being taken friendship mutually, its spacing 1 satisfy relation 1≤L wherein L represent the middle pole (21) of fuse to go up along the width that extends axially part.

7, signal generator for ignition of internal combustion engines as claimed in claim 4, it is characterized in that: pole plate (16,17) has the second ladder section (16D, 17D), its axial superposition section length 1 ' L ', wherein L ' represent the middle pole (21) of core (19) of E shape stator (12) and either side pole (19B) or (19C) between distance.

8, signal generator for ignition of internal combustion engines as claimed in claim 5, it is characterized in that pole plate (16,17) has the second ladder section (16D, 17D), its axial superposition section length 1 ' 〉=L ', the wherein distance between the main pole post (21) of the core (19) of the above-mentioned U type of L ' representative stator (12) and the side pole post (19B or 19C).