Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-09-01
2001-04-17
Nguyen, Tran (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S052000
Reexamination Certificate
active
06218747
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a car AC generator having a cooling function with a cooling liquid and cooling air.
2. Description of the Prior Art
FIG. 3
is a sectional view of a brushless car AC generator disclosed by Japanese Patent No. 4-68850. In
FIG. 3
, reference numeral
101
denotes a generator case. A bowl-like front bracket
102
, a bowl-like rear bracket
103
and a cylindrical enclosing member
104
are combined together to form an inner part chamber
105
and an outer first cooling chamber
106
. Denoted by
107
is a sealing member such as an O ring fitted in an interface portion between the front bracket
102
and the rear bracket
103
,
108
a gasket fitted in an interface portion between the front bracket
102
and the enclosing member
104
,
109
a gasket fitted in an interface portion between the rear bracket
103
and the enclosing member
104
, and
110
an inflow port formed in the rear bracket
103
. Reference numeral
111
represents a cylindrical stator which comprises a stator magnetic pole
112
and a stator coil
113
and is installed in the enclosing member
104
, and
114
is a generator shaft which is rotably placed in a center portion of the front bracket
102
and a center portion of the rear bracket
103
by a front bearing
115
and a rear bearing
116
. Denoted by
117
is a pulley which is fitted onto the generator shaft
114
projecting forward from the front bracket
102
so that it can turn together with the shaft
114
,
118
a rotary magnetic pole which comprises a first rotary magnetic pole
119
fitted onto the generator shaft
114
so that it can turn together with the shaft
114
and a second rotary magnetic pole
121
fixed to a peripheral portion of the first rotary magnetic pole
119
through a support ring
120
in the part chamber
105
. Reference numeral
122
denotes an exciter which comprises an excitation pole
123
fixed to the rear bracket
103
and an excitation coil
124
attached to the excitation pole
123
and which is stored in a cylindrical container portion
125
formed in the rotary magnetic pole
118
. An air gap is existent between the stator
111
and the rotary magnetic pole
118
and between the rotary magnetic pole
118
and the excitation pole
122
. Denoted by
126
is a heat conductor, extending through the rear bracket
103
, for radiating the heat of the exciter
122
,
127
a sealing agent charged into a portion where the heat conductor
126
extends through the rear bracket
103
,
128
a plate-like cooling cover which is placed upon the rear bracket
103
to form a second cooling chamber
129
between it and the rear surface of the rear bracket
103
,
130
a connection passage formed in the rear bracket
103
which connects the first cooling chamber
106
and the second cooling chamber
129
,
131
a gasket fitted in an interface portion between the rear bracket
103
and the cooling cover
128
,
132
a voltage regulator installed on the rear surface of the cooling cover
128
,
133
a voltage regulator terminal,
134
a rectifier installed on the rear surface of the cooling cover
128
,
135
a rectifier terminal,
136
a stator terminal connected to the rectifier terminal
135
and projecting from the enclosing member
104
,
137
an external terminal provided in the vicinity of the rectifier
134
,
138
a connector for the external terminal
137
connected to the voltage regulator terminal
135
,
140
a protective cover attached to the rear bracket
103
to cover the cooling cover
128
, the voltage regulator
132
, the voltage regulator terminal
133
, the rectifier
134
, the rectifier terminal
135
, the stator terminal
136
and the connector
138
,
141
a hole formed in the protective cover
140
for the external terminal
137
to project from the protective cover
140
, and
142
a cooling liquid.
A description is first given of the power generation operation of the AC generator of the prior art when it is used in an automobile. The AC generator is installed outside the cylinder block of an engine, a ring-shaped belt is laid between a pulley provided on the crank shaft of the engine and the pulley
117
of the AC generator, and the external terminal
137
is wired to the battery of the automobile. When a driver turns on the ignition switch of the automobile in this state, a current runs from the battery of the automobile to an ignition coil to start the engine, an excitation current runs from the battery to the excitation coil
124
through the voltage regulator
132
at the same time, and the stator magnetic pole
112
, the rotary magnetic pole
118
and the excitation pole
123
form a magnetic circuit. When the generator shaft
114
turns by the start of the engine and the rotary magnetic pole
118
turns, the first rotary magnetic pole
119
and the second rotary magnetic pole
121
pass by the stator magnetic pole
112
alternately, whereby an alternating magnetic flux runs through the stator coil
113
and 3-phase alternating induced electromotive force is generated in the stator coil
113
. This induced electromotive force is adjusted by the voltage regulator
132
, rectified by the rectifier
134
and charged into the battery from the external terminal
137
through an unshown wire.
A description is subsequently given of the cooling operation of the AC generator of the prior art when it is used in the automobile. The AC generator is attached to the engine, the inflow port
110
and an unshown outflow port are connected to an engine cooling system by an unshown pipe, the AC generator generates power by the start of the engine, and the water pump of the engine cooling system is driven to circulate the cooling liquid. In this state, the cooling liquid
142
shown by dotted lines flows from the inflow port
110
to the first cooling chamber
106
, the connection passage
130
and the second cooling chamber
129
as shown by an arrow X
3
. In the first cooling chamber
106
and the second cooling chamber
129
, heat generated from such parts as the stator
111
, the exciter
122
, the voltage regulator
132
and the rectifier
134
by the operation of power generation is absorbed by the cooling liquid
142
through heat exchange with the cooling liquid
142
. The cooling liquid
142
which has absorbed the heat returns to the engine cooling system from the outflow port (a structure similar to this cooling system is disclosed by
FIG. 12
of Japanese Laid-open Patent Application No. 8-130854).
SUMMARY OF THE INVENTION
Since the car AC generator of the prior art is constituted as described above, the first cooling chamber
106
is formed apart from the part chamber
105
by three separate parts, the front bracket
102
, the rear bracket
103
and the cylindrical enclosing member
104
, and the second cooling chamber
129
is formed outside the generator case
101
by two separate parts, the rear bracket
103
and the cooling cover
128
. Therefore, the structures of portions having a cooling function with the cooling liquid
142
are complex.
It is therefore an object of the present invention to provide a car AC generator which is capable of simplifying the structures of cooling function portions with a cooling liquid and cooling air.
According to a first aspect of the present invention, there is provided a car AC generator having a cooling function with a cooling liquid and cooling air, wherein at least one of a front bracket and a rear bracket has a ring-shaped cooling recessed portion in a peripheral portion, the front bracket and the rear bracket are combined together to form a part chamber for storing power generation parts consisting of a generator shaft, a stator and a rotor, the cooling recessed portion forms a ring-shaped peripheral cooling chamber, a cooling cover is placed upon a rear portion of the rear bracket to form a rear cooling chamber with the rear bracket, the rear bracket has a communication hole for connecting the peripheral cooling chamber to the rear cooling chamber, at least one of the front bracket
Mitsubishi Denki & Kabushiki Kaisha
Nguyen Tran
Sughrue Mion Zinn Macpeak & Seas, PLLC
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