Internal-combustion engines – Igniters – Sparkers
Patent
1992-03-02
1994-05-24
Nelli, Raymond A.
Internal-combustion engines
Igniters
Sparkers
F02P 100
Patent
active
053139186
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD AND PRIOR ART
In multiple cylinder combustion engines it is common practice to use, for distributing sparks to the various sparkplugs, a so called distributor, i.e. an arm synchronously coupled to the engine and having a contact function. In e.g. small two cylinder engines it could be structurally complicated as well as expensive to provide, in association with the flywheel magneto often used in such types of engines, also a distributor. There are possibilities nowadays to conduct the igniting processes by means of electronic control circuits so that igniting occurs at the proper time in the proper cylinder. However, also such solutions are comparatively expensive.
SUMMARY OF THE INVENTION
The present invention relates to a solution of the problem mentioned above. The invention is based on a process of generating a trigger releasing pulse by using asymmetric magnetic field induction. The invention thus relates to an arrangement in flywheel magnetos for multiple cylinder combustion engines, said arrangement including a magnet core, which is divided into several like parts and carries windings, and magnet poles moveable in relation to the magnet core. The novelty of the invention resides essentially in the feature that the number of core parts or divisions forms an integer and that half the number of parts forms an odd number. Moreover, the magnet poles are arranged in groups with their polarity alternating, the pole pitch within the groups coinciding with the core pitch. Adjacent core parts, thus spaced one pitch, carry each its control winding connected to a circuit for sensing voltage polarity in order to produce distributed trigger signals for the respective engine cylinder.
The features characterizing the invention will appear from the accompanying claims.
DESCRIPTION OF THE FIGURES
The invention will be described in greater detail with reference to the accompanying drawings which illustrate embodiments of the invention.
FIG. 1 shows diagrammatically the structure of a generator part of an arrangement according to the invention.
FIG. 2 shows a circuit diagram for the ignition circuits of the cylinders in an associated combustion engine.
FIG. 3 is divided into ten subfigures a-j which illustrate diagrammatically various conditions of induction during one revolution of the magneto flywheel.
DESCRIPTION OF AN EMBODIMENT
The generator part shown in FIG. 1 of the flywheel magneto comprises a flywheel 1 with eight permanent magnets forming poles 2-9 having different polarities indicated by N and S, that is, north and south. Said poles are so distributed that they are able to cooperate symmetrically with a core 10 having radially extending core legs 11-20. As can be seen the spacing or pitching is such that the number of core legs forms an even number, in this case ten, which divided into halves gives five, i.e. an odd number. As shown in the figure the magnet poles 2, 3, 4 and 5 form a group, in the illustrated case cooperating with the core legs 12, 13, 14 and 15. Poles 6, 7, 8 and 9 form a second group cooperating with core legs 17, 18, 19 and 20. Hence, with respect to spacing there is a gap between poles 2 and 9 and between poles 5 and 6.
The core leg 11 carries a trigger winding 21 and the core leg 12 carries a trigger winding 22, the windings being connected such in the present case that they are in opposition with respect to induction. The trigger winding 21 has a tapping point 23 and the trigger winding 22 has a tapping point 24. Between the two windings there is a tapping point 25. As indicated by dashed lines there is on core leg 15 a generator winding 26 for generating a charging voltage for the associated capacitor ignition system. As a matter of course winding 26 can be interconnected with other windings on legs 13-20 for generating the necessary voltage, but this is of secondary importance when it comes to explaining the present invention. Said last mentioned winding 26 has two tapping points 27 and 28.
The flywheel is assumed to rotate about a central axis 29 in a dire
REFERENCES:
patent: 3828754 (1974-08-01), Carlsson
patent: 3893439 (1975-07-01), Chudoba
patent: 3942501 (1976-03-01), Byles
patent: 4019485 (1977-04-01), Carlsson
patent: 4345533 (1982-08-01), Magrane et al.
patent: 4628891 (1986-12-01), Asai et al.
patent: 4901704 (1990-02-01), Safranek
patent: 4915068 (1990-04-01), Tharman
patent: 5072714 (1991-12-01), Bengtsson et al.
Nelli Raymond A.
SEM AB
LandOfFree
Flywheel magneto arrangement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flywheel magneto arrangement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flywheel magneto arrangement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1966172