Rotating electric machine

Internal-combustion engines – Cooling – With cooling of additional parts or materials

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Details

310 54, F01P 320, H02K 900

Patent

active

049559443

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

This invention relates to a rotating electric machine such as an engine starting and charging device comprising as a unit a starting motor for starting an automotive engine and a charging generator which is driven by the engine to charge a battery, and an a.c. generator for automobiles which is driven by the automotive engine.


BACKGROUND OF THE INVENTION

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 is constituted of revolving-field poles 2a, 2b, field windings 3, an armature core 4, an armature winding 5, and a crank angle detector 6 as major components.
A pair of revolving-field poles 2a, 2b are comb-shaped ones produced of a ferromagnetic material, and are coupled as a unit through a non-magnetic ring 7 such that these magnetic pole sections are disposed alternately in the circumferential direction.
The revolving-field pole 2a functions also as a flywheel, which is fitted on a crankshaft 8 as a revolving shaft of the engine, and firmly secured by a bolt 9 on the end of this crankshaft 8.
In the side section of the revolving-field pole 2a are formed cutouts 10 which, combined with a crank angle detector 6, are used for the detection of the crank angle. There are provided the same number of cutouts 10 as the revolving-field poles 2a at equal intervals on the circumference.
The width of this 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 energizing the field winding 3, which is installed on the field core 11.
This field core 11 is secured by a bolt not illustrated to a rear plate 12, facing the revolving-field pole 2a across a slight gap a provided in the axial direction, and facing 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 in the armature winding 5, it is possible to energize it 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 winding 5 therein. The armature winding 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 to the mounting frame 13 by a key not illustrated, and locked from turning. At this time, the armature core 4 is secured by a spacer 14 in the axial direction 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 attached to an engine body which is not illustrated.
In the meantime, the crank angle detector 6 described above functions as a signal source which operates the armature current switching circuit. Here, a signal-generating proximity switch is used.
This proximity switch is mounted on the rear plate 12 such that its detector element will face on the circumferential line where the cutout 10 of the revolving-field pole 2a is disposed, and signal generating conditions vary with a change in inductance at the cutout section and non-cutout section of the revolving-field pole 2a, thus outputting a binary signal "1" or "0" correspondingly to the crank angle (field pole position). When a three-phase armature winding 5 is employed, three crank angle detectors 6 will be used.
A clutch 17 serves to interrupt the transmission of power between the crankshaft 8 and a transmission drive shaft 18. This clutch 17 uses a diaphragm spring clutch consisting of a clutch disc 19, a pressure plate 20, a diaphragm spring (disc spring) 12, wire rings 22, 23, and a clutch cover 24.
The clutch cover 22 is mounted by bolts 25 to the revolving-field pole 2a whi

REFERENCES:
patent: 3052225 (1962-09-01), Kiekhaefer
patent: 4262224 (1981-04-01), Kofink et al.
patent: 4295067 (1981-10-01), Binder et al.
patent: 4468580 (1984-01-01), Sasaki et al.
patent: 4500722 (1985-02-01), Ahner et al.
patent: 4739204 (1988-04-01), Kitamura et al.
patent: 4765283 (1988-08-01), Kitamura et al.
patent: 4779905 (1988-10-01), Ito et al.
patent: 4818906 (1989-04-01), Kitamura et al.
patent: 4864974 (1989-09-01), Aso

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