Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1988-11-28
1990-05-01
Salce, Patrick R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310239, 310249, H02K 504, H02K 514
Patent
active
049221493
ABSTRACT:
A rear housing structure of an electric motor device is disclosed, which comprises a cup-shaped rear bracket made of resin coupled to the cylindrical yoke. According to one aspect of the invention, the rear bracket is secured to the yoke by a through bolt which extends, at the head thereof, through a boss formed at the outside of the side of the bracket, and is fastened to the front frame coupled to the front (or output) side of the yoke. An abutment member, which may by integral with the yoke or the base plate for the brush of the motor, extends radially outwardly from the rear end of the yoke, so that the front end of the boss abuts against this abutment member. Thus, the fastening force of the through bolt is born by the abutment member and the development of the bending and tensile stresses in the bracket can be prevented. According to another aspect, the through bolt extends through the bottom of the cup-shaped rear bracket and runs within the yoke to be fastened to the front frame. The rear end of the yoke is expanded radially outwardly to form a funnel-shaped socket into which the end portion of the bracket is fitted. The engaging end portion of the bracket has an equal thickness as other portions of the side of the bracket. Thus, enough mechanicl strength of the end portion of the bracket is ensured against the radially outwardly directed force generated therein by the fastening force of the bolt.
REFERENCES:
patent: 2795713 (1957-06-01), Woll et al.
patent: 4100440 (1978-07-01), Binder et al.
patent: 4538085 (1985-08-01), Tanaka
Isozumi Shuzoo
Konishi Keiichi
Jones Judson H.
Mitsubishi Denki & Kabushiki Kaisha
Salce Patrick R.
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