Denso Corporation

Kazutoshi Nakano

Nobuhiro Shioya

A vehicular alternating current generator has slip rings, an enclosure, a rear cover, and a sealing plate. The slip rings are provided on a rotary shaft of a rotor. The enclosure component encloses a peripheral space surrounding the slip rings and brushes, and the rear cover covers electrical components including the brushes. The sealing plate, which is made of a material having elasticity, is attached to an end surface of the rear cover in a vertical direction and encloses a surrounding area of the enclosure component.

Vehicular alternating current generator

According to the present invention, there is provided an automotive alternator which includes a rotor, a stator, a rolling bearing, and a bearing cover. The rotor includes a rotary shaft and works to create a rotating magnetic filed. The stator works to generate an AC power in the rotating magnetic field created by the rotor. The rolling bearing rotatably supports the rotary shaft of the rotor. The bearing cover covers an axial end of the rolling bearing. The bearing cover has flexibility in an axial direction of the rotary shaft and is fitted in place with the flexibility thereof.

Automotive alternator having flexible bearing cover

An alternator for use in an automobile is driven by an internal combustion engine. The alternator includes a pulley that is coupled to a rotating shaft of the engine via a driving belt such as a poly-V belt. Plural pulley grooves to be engaged with the driving belt are formed on the pulley between a front flange and a rear flange. A projected surface of a front frame is located around the outer periphery of the rear flange, so that the driving belt is correctly positioned between the front and the rear flanges, guided by the projected surface. Two overlaps in the axial direction between the pulley and the front frame are formed to reduce an amount of water entering into the alternator through a gap between the pulley and the front frame.

Alternator having driving pulley with end flanges

An alternator for an automotive vehicle is substantially composed of a housing, a rotor having a field coil and a stator having stator coils. A cooling fan is connected to an axial end of the rotor. The stator is fixedly disposed in the housing and the rotor is rotatably supported in the housing. According to rotation of the rotor, alternating current is generated in the stator coils, and the alternating current is rectified into direct current to charge an on-board battery. Inlet ports for introducing cooling air into the housing are formed between spokes formed on an axial end wall of the housing. The spokes are slanted in the direction opposite to the rotational direction of the rotor relative to the radial direction to thereby reduce airflow noise generated around the spokes.

Automotive alternator having housing for reducing cooling fan noise

A vehicle AC generator include a frame, stator, rotor, rectifier, protective cover, and cooling fan. The rectifier includes plural rectifying elements consisting of positive and negative rectifying elements and is secured on an outer end portion of the frame. The rectifier includes larger-diameter and smaller-diameter fins. The negative rectifying elements are mounted on the larger-diameter fin. The positive rectifying elements are mounted on the smaller-diameter fin. The protective cover includes an axial opening facing the smaller-diameter fin. The frame includes a radial opening formed with the aid of a radially outer end of the frame, a radial air passage formed with facing the larger-diameter fin, and plural grooves. Each groove positionally corresponds to a mounted position of each rectifying element on the larger-diameter fin and is formed on the radial air passage to connect a radially outer end and a radially inner end of the frame.

Growing community of inventors

Kariya, Japan

Kazutoshi Nakano