US 5,686,773 AGranted

Alternator with generally triangular engine-mounting stays

AssigneeNippondenso Co., Ltd.

InventorsHiroshi Sakakibara, Hirofumi Fujimoto

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Abstract

The connection structure of alternator mount stays with a drive frame and a rear frame is strengthened so that increased vibration of the alternator's rotor and a stator is prevented and, accordingly, generation of magnetic noise is suppressed. The alternator is provided with generally triangular engine-mounting stays which are secured to an engine. A plurality of stay-reinforcement ribs are integrally formed with sides of the engine-mounting stays of the alternator and with the bottom of outer peripheries of the alternator, thereby increasing the rigidity of the stays. Consequently, vibrations from the engine are not amplified by the engine-mounting stays or transmitted to the drive frame or to the rear frame, thereby suppressing an increase in vibration of the rotor and the stator. Deformation of the drive frame and the rear frame due to the vibration transmitted from the engine is also prevented. As a result, an increase in distortion of the magnetic field is prevented and harsh magnetic noise is suppressed.

Claims9

Dependent claims

An alternator adapted to be mounted on a vibrating body, said alternator comprising:

a rotor having a shaft rotatable therewith as a unit,
a stator disposed around said rotor,
a first frame having a first side wall rotatably supporting one end of said shaft, a first cylindrical portion supporting one side of said stator, a first stay disposed at a circumference of said first cylindrical portion and adapted to be secured to said vibrating body and a first connecting member integral with said first frame connecting said first stay to an outer surface of said first cylindrical portion, and
a second frame having a second side wall rotatably supporting another end of said shaft, a second cylindrical portion supporting another side of said stator, a second stay disposed at a circumference of said second cylindrical portion and adapted to be secured to said vibrating body together with said first stay and a second connecting member integral with said second frame connecting said second stay to an outer surface of said second cylindrical portion, wherein
said first connecting member diagonally extends from said first stay to said first side wall and said second connecting member extends from said second stay to said second side wall so that said first and second connecting members, said stator and said first and second frames form a triangle in an axial cross-section including said shaft to increase rigidity when said first and second stays are secured to said vibrating body.

2 more elements

Dependencies are inferred from the claim text.