Prime-mover dynamo plants – Electric control – Starting and generating dynamo
Patent
1988-10-06
1990-01-16
Jennings, Derek S.
Prime-mover dynamo plants
Electric control
Starting and generating dynamo
290 46, H02K 1712, H02K 1742
Patent
active
048945536
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an engine starting and charging device that a starting motor for starting an engine and a charging generator driven by the engine to charge a battery are constructed as a unit.
BACKGROUND OF THE INVENTION
An engine starting and charging device of prior art constituted of a starting motor and a charging generator as one unit has been suggested, for example, one disclosed in Laid-Open Japanese Patent No. Sho 61-54949.
FIG. 1 is a sectional view of a prior-art engine starting and charging device disclosed in Laid-Open Japanese Patent No. Sho 61-54949. In FIG. 1, a starting and charging device body 1 comprises revolving-field poles 2a, 2b, a field coil 3, an armature core 4, an armature coil 5, and a crank angle detector 6 as major components.
The revolving-field poles 2a, 2b are a pair of comb-shaped field poles produced of a ferromagnetic material, which are coupled as a unit through a ring 7 of a non-magnetic material such that their magnetic pole sections are arranged alternately in the circumferential direction. The field pole 2a, functioning as a flywheel and also as a clutch carrier described later, is mounted on an engine crankshaft 8, and fixed on the end of the crankshaft 8 by a bolt 9. Numeral 10 is a cutout formed at the side section of the field pole 2a, which, combined with the crank angle detector 6, is used to detect the crank angle; the same number of cutouts as the number of magnetic poles of the field pole 2a are provided at equal intervals around the circumference. The width of the cutout 10 in the circumferential direction makes an angle equal to about one half of 360 degrees divided by the number of the cutouts.
The field coil 3, which is for exciting the field poles 2a, 2b, is mounted on the field core 11. This field core 11 is mounted and fixed to a bracket 12 by bolts, which are not illustrated, facing the field poles 2a, 2b, across slight air gaps a, b in the radial direction.
The armature core 4 is formed by laminating silicon steel sheets, within the inner periphery of which are provided a number of slots for setting the armature coil 5 therein, the armature coil 5 being of a three-phase distributed winding type as a common commutatorless motor. The armature core 4 is properly positioned and fixed in relation to the bracket 12, which is secured by bolts 15 to an engine body 13 together with a housing 14 for securing the armature core 4.
The crank angle detector 6 functions as a signal source that operates an armature current switching circuit which is not illustrated, and uses an oscillation-type proximity switch. This proximity switch is mounted on the bracket 12 such that its detecting element is disposed on the circumferential line where the cutouts 10 of the field pole 2a are provided, and its oscillating conditions vary with the change of inductance at the cutout and non-cutout sections of the field pole 2a, outputting a binary signal "1" or "0" corresponding to the crank angle (field pole position). When a three-phase armature coil 5 is employed, there will be installed three crank angle detectors 6.
Numeral 16 is a clutch for the interruption of transmission of power between the crankshaft 8 and a transmission drive shaft 17, and uses a diaphragm spring clutch comprising a clutch disc 18, a pressure plate 19, a diaphragm spring (disc spring) 20, wire rings 21, 22, and a clutch cover 23. The clutch cover 23 is mounted by bolts 24 to the field pole 2a.
The clutch 16, as is well known, is of such a constitution that when a clutch pedal (not illustrated) is not depressed, the tension of the diaphragm spring 20 is exerted, by leverage, through the pressure plate 19 to the clutch disc 18 mounted on the transmission drive shaft 17, pressing this clutch disc 18 against the side of the field pole 2a to connect the clutch.
When the clutch pedal is depressed, the sleeve, which is not illustrated, slides in the axial direction, pressing the central part of the diaphragm spring 20 in the direction of the arrow C. Therefore the di
REFERENCES:
patent: 3908130 (1975-09-01), Lafuze
patent: 3908161 (1975-09-01), Messenger
patent: 4459536 (1984-07-01), Wirtz
patent: 4684814 (1987-08-01), Radomski
patent: 4803376 (1989-02-01), N'Guyen
Duncanson Jr. W. E.
Jennings Derek S.
Mitsubishi Denki & Kabushiki Kaisha
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