Coaxial type engine starter with hollow armature shaft

Details Coaxial type engine starter with hollow armature shaft Coaxial type engine starter with hollow armature shaft

1988-08-15

1990-12-18

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 71, H02K 710

Patent

active

049788744

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to improvements in engine starters used in automobiles' engines, etc., and DC motors used in such engine starters, etc..


BACKGROUND ART

An example known of starters of the type having planetary reduction gears built therein is shown in FIG. 1. In this figure, 101 designates an armture, and 102 an armature rotation shaft with a commutator 103 engagingly set thereon at the rear part thereof. To this commutator 103, armature coils 104 are connected.
Numeral 105 designates a brush and holder to be in contact with the commutator 103, which are secured to a rear bracket 107. Numeral 108 designates a bearing, and 109 a yoke of dc motor, which has a plurality of permanent magnets 109a securely set on the internal circumferential surface thereof.
On an end surface of this yoke 109, a front bracket 111 wherein an internal gear 110, which comprises a planetary reduction gear, is engagingly mounted as shown in the figure. With both spur gear 112 and the internal gear 110, a plurality of planetary gears 113 are engaged. Numeral 114 designates a bearing supported by a supporting pin 115 and engagingly set on the internal circumferential surface of the planetary gear 113, and numeral 116 designates a flange for fixedly setting this supporting pin 115, which composes an arm of the planetary reduction gear, with a rotation output shaft 117 fixedly set thereon at the rear. Numeral 118 designates a sleeve bearing, and 119 also a sleeve bearing engagingly fit in the rear inner circumferential cavity of the rotation output shaft 117, which bears the front end part of the afore-mentioned armature rotation shaft 102. Numeral 120 designates a steel ball for giving an taking the thrust force, and 121 a helical spline formed on the outer circumference of the intermediate part of the rotation output shaft 117, with an overrunning clutch 122 in front and in a rear slidably engaged thereon in spline way. Numeral 123 designates a stopper provided at the front end part of the output shaft 117 for controlling the axial shift of a pinion 124, and 125 a sleeve bearing for bearing the rotation output shaft 117 at its front end part, which is engagingly set on the front end inside surface of the front bracket 111. Numeral 126 designates a lever having a rotation shaft 126a, each end of which is to be engagingly fit on the outer peripheral parts of a plunger 128 of an electromagnetic switch 127 and the overrunning clutch 122, as shown in this figure. Numeral 129 designates a movable contact, which is mounted on a rod 131 through an insulator 130, and the rod 131 is in front and in rear movably inserted in a core 132. Numeral 133 designates a fixed contact which is fixed, by means of a nut 134, to a cap 135 which is of an insulator. Numeral 136 designates an exciting coil for urging the plunger 128, which is wound on a bobbin 137 and contained in a case 138 in that state. Numeral 139 designates a lead wire, which connects the fixed contact 133 with a brush of the brush-and-holder 105.
In the following, the operation of this starter is described. By closing a key switch not shown in this figure, an exciting coil 136 of the electromagnetic switch 127 is energized, whereby the plunger 128 is urged to move rearward, to push the rod 131 rearward, thereby setting the movable contact 129 to abut the fixed contact 133. Thereby, power is supplied to the armature coils 104 from the fixed contacts 133 through lead wires 139 and the brush-and-holder 105, causing the armature 101 to produce its turning force. The rotation of the armature 101 is transmitted from the spur gear 112 to the planetary gear 113 and, then, to the overrunning clutch 122, with the speed reduced by the planetary reduction gear. At this time, the pinion 124 which is engaged with the overrunniing clutch 122 is rotationally driven together with the rotation output shaft 117.
On the other hand, the force of the plunger 28 which has been urged as hereabove described rotates the lever 126 counterclockwise with the rotation shaft 126a as the

REFERENCES:
patent: 4116077 (1976-11-01), Mazzorana
patent: 4128778 (1978-12-01), Merkle et al.
patent: 4587861 (1984-07-01), Morishita
patent: 4604907 (1984-11-01), Morishita et al.
patent: 4816712 (1989-03-01), Tanaka
patent: 4838100 (1989-06-01), Tanaka
patent: 4852417 (1989-08-01), Tanaka
patent: 4862027 (1989-08-01), Isozumi et al.

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