Prime-mover dynamo plants – Starting and generating dynamo
Patent
1988-10-06
1990-04-17
Jennings, Derek S.
Prime-mover dynamo plants
Starting and generating dynamo
74 7C, F02N 1100, F16D 312
Patent
active
049183230
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 formed as one unit.
BACKGROUND OF THE INVENTION
An engine starting and charging device comprising a starting motor and a charging generator as one unit has been suggested as a prior art, for example, one disclosed in Laid-Open Japanese Pat. No. Sho No. 61-54949.
FIG. 1 is a sectional view of a prior-art engine starting and charging device disclosed in Laid-Open Japanese Pat. No. Sho No. 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 non-magnetic material such that those magnetic pole sections are disposed alternately in the circumferential direction.
The revolving-field pole 2a functions also as a flywheel, is fitted on an engine crankshaft 8, and then securely installed by a bolt 9 on the shaft end of this crankshaft 8.
In the side portion of the revolving-field pole 2a is formed a cutout 10 which, combined with the crank angle detector 6, is used to detect the crank angle. The same number of cutouts as the number of the revolving-field poles 2a are provided at equal intervals on 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 revolving-field poles 2a, 2b described above are so designed as to be excited by the field winding 3. This field winding 3 is mounted on the field core 11.
This field core 11 is secured by bolts not illustrated, to a rear plate 12, facing the revolving-field pole 2a across a slight gap a provided in the axial direction, and the revolving-field pole 2b across a slight gap b.
The field winding 3 is provided on the fixed side, dispensing with a collector ring; however, because the current flowing into the field winding 3 is much less than the current of the armature winding 5, the current can be applied also through a collector ring and brushes.
The armature core 4 is formed by laminating silicon steel sheets, within the inner periphery of which are provided a large number of slots for setting the armature coil 5 therein. The armature coil 5 is of a three-phase distributed winding type as a common commutatorless motor.
The armature core 4 is fitted to a mounting frame 13, positioned and locked from turning by a key not illustrated, to this mounting frame 13. At this time, the armature core 4 is fixed by a spacer 14 in the axial direction relative to the mounting frame 13 through a spring ring 15.
Furthermore, the mounting frame 13 is mounted by a bolt 16 to the rear plate 12. The rear plate 12 is mounted to the engine body which is not illustrated.
In the meantime, the aforementioned crank angle detector 6 serves as a signal source to energize an armature current switching circuit; here are used signal-generating type proximity switches.
The proximity switches are mounted on the rear plate 12 such that their detecting elements will face each other on the circumferential line where the cutouts 10 of the revolving-field pole 2a are provided, and output a binary signal "1" or "0" corresponding to the crank angle (field pole position) as signal generating conditions vary with a change in inductance at the cutout and non-cutout sections of the revolving-field pole 2a. When a three-phase armature winding 5 is employed, there are used three crank angle detectors 6.
A clutch 17 functions to interruptedly transmit the power from the crankshaft 8 to the transmission drive shaft 18. This clutch 17 is a diaphragm spring clutch comprising a clutch disc 19, a pressure plate 20, a diaphragm spring (disc spring) 21, wire-rings 22, 23, and a clutch cover 24.
REFERENCES:
patent: 4010377 (1977-03-01), McKenzie
patent: 4317435 (1982-03-01), Kohlhage
patent: 4624351 (1986-11-01), Lutz et al.
Duncanson Jr. W. E.
Jennings Derek S.
Mitsubishi Denki & Kabushiki Kaisha
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