Planetary gear transmission systems or components – Reversal of direction of power flow changes power... – Input and output exchange functions
Reexamination Certificate
2001-08-29
2004-07-06
Marmor, Charles A. (Department: 3681)
Planetary gear transmission systems or components
Reversal of direction of power flow changes power...
Input and output exchange functions
C475S154000
Reexamination Certificate
active
06758781
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an automotive AC rotating machine.
2. Description of the Related Art
FIG. 2
is a section view showing a conventional automotive AC rotating machine (hereinafter, an automotive AC rotating machine is often referred to merely as a rotating machine). Referring to the figure, the rotating machine comprises: a first bracket
51
; a Landor type rotor
53
which is disposed in the first bracket
51
, and which is fixed to a rotor shaft
52
; a stator
54
which is fixed to an inner wall face of the first bracket
51
; a slip ring
55
which is fixed to an end portion of the rotor shaft
52
to supply a current to the rotor
53
; a pair of brushes
56
which are in sliding contact with the surface of the slip ring
55
; and a brush holder
58
which houses the brushes
56
and springs
57
pressing the brushes
56
.
The rotor
53
comprises a field winding
59
through which a current flows to generate magnetic fluxes, and a rotor core
60
which covers the field winding
59
. The stator
54
comprises a stator core
61
through which the magnetic fluxes from the field winding
59
pass, and in which plural steel plates are stacked, and a three-phase stator winding
62
through which a three-phase current flows.
The rotating machine further comprises an electromagnetic clutch
64
which is disposed in a second bracket
63
, a planetary gear mechanism
65
, a pulley
66
, and a one-way clutch
67
.
The electromagnetic clutch
64
comprises: an electromagnetic clutch body
70
which is fixed to the second bracket
63
by fixing means
69
such as a fixing screw
68
and a key; a field coil
71
which is disposed in the electromagnetic clutch body
70
; an electromagnetic clutch driven member
75
which is fixed by a fixing screw
73
via a holding member
72
of the first bracket
51
, which is opposed to the electromagnetic clutch body
70
, and which has an engaging portion
74
; and a spring
76
which is disposed between the electromagnetic clutch driven member
75
and the head of the fixing screw
73
, and which urges the electromagnetic clutch driven member
75
toward the opposite side of the electromagnetic clutch body
70
.
A guide face
72
a
is formed on the outer peripheral face of the holding member
72
. The electromagnetic clutch driven member
75
is attached to the holding member
72
by causing a guide face
75
b
which is formed on the inner peripheral face of the electromagnetic clutch driven member
75
, to axially slide over the guide face
72
a
. Alternatively, the holding member
72
of the first bracket
51
may be integrally molded instead of being formed as a separate member.
The planetary gear mechanism
65
comprises: a sun gear
77
; a cylindrical member
80
in which an engaging portion
78
that is to be engaged with the engaging portion
74
of the electromagnetic clutch driven member
75
is formed in an end face, and an internal gear
79
is formed in the inner wall face; a bearing
81
which is disposed between one end face of the cylindrical member
80
and an end portion of the first bracket
51
; a planet gear
82
which meshes with the internal gear
79
and the sun gear
77
; a planet gear shaft
84
which is passed through a center portion of the planet gear
82
via a bearing
83
; a carrier
85
which rotatably supports the planet gear
82
via the planet gear shaft
84
, and which is configured integrally with the pulley
66
; and a bearing
86
which is disposed between an end portion of the carrier
85
and that of the cylindrical member
80
.
The one-way clutch
67
comprises: a cam portion
87
which is disposed inside the carrier
85
; bearings
88
which are disposed respectively on both sides of the cam portion
87
; and a driven member
90
which is fixed together with the sun gear
77
to an end portion of the rotor shaft
52
via a fixing key
89
.
The reference numerals
91
and
92
denote bearings,
93
and
94
denote spacers, and
95
denotes a fixing bolt.
Next, the operation will be described.
The motor operation of the rotating machine will be first described.
When an engine is to be started, the field coil
71
of the electromagnetic clutch
64
is energized, the electromagnetic clutch driven member
75
is driven against the elastic force of the spring
76
to be joined with the electromagnetic clutch body
70
, and the engaging portion
74
of the electromagnetic clutch driven member
75
is engaged with the engaging portion
78
of the cylindrical member
80
.
As a result, the internal gear
79
of the cylindrical member
80
functions as a fixed element, so that speed reduction at the reduction ratio of the planetary gear mechanism
65
is enabled. With respect to the rotating force of the rotor
53
, the sun gear
77
functions as an input element, and the rotation of the sun gear
77
causes the planet gear
82
to revolve around the sun gear
77
while rotating about the planet gear shaft
84
.
In accordance with the revolution of the planet gear
82
, the carrier
85
functions as an output element, the pulley
66
which is integrated with the carrier
85
rotates, and the rotating force is transmitted to the engine via a belt (not shown) which is wound around the pulley
66
, whereby the engine is started. At this time, the one-way clutch
67
operates idle. Therefore, the engine is driven by a product of the rotational speed of the rotor
53
, the reduction ratio of the planetary gear mechanism
65
, and that of the pulley
66
and a crank pulley (not shown) of the engine.
The rotating force of the rotor
53
is obtained by supplying an exciting current to the field winding
59
via a battery (not shown), the brushes
56
, and the slip ring
55
to generate magnetic fluxes in the rotor core
60
, and, in this state, supplying a three-phase current to the three-phase stator winding
62
.
Next, the generator operation of the rotating machine will be described.
When an electric power is to be supplied by the generator operation, the energization of the field coil
71
of the electromagnetic clutch
64
is interrupted, so that the electromagnetic clutch driven member
75
is separated from the electromagnetic clutch body
70
by the elastic force of the spring
76
to cancel the engagement of the engaging portion
74
of the electromagnetic clutch driven member
75
and the engaging portion
78
of the cylindrical member
80
, thereby enabling the cylindrical member
80
to rotate. Under this state, the power from the engine is transmitted via the pulley
66
to the carrier
85
functioning as an input element. At this time, the one-way clutch
67
performs an engaging action. In accordance with the rotation of the carrier
85
, therefore, the rotor
53
is caused to rotate via the rotor shaft
52
, and an electromotive force is generated in the three-phase stator winding
62
.
Since the conventional automotive AC rotating machine is configured as described above, the planetary gear mechanism
65
is assembled in the following manner. First, the one-way clutch
67
is previously attached to the inside of the carrier
85
, and the inner periphery of the bearing
86
is then fitted onto the outer periphery of the carrier
85
. Thereafter, the planet gear shaft
84
which holds the planet gear
82
via the bearing
83
is fitted into the carrier
85
, whereby a sub assembly is configured. The sub assembly and all must be pressingly inserted along the outer periphery of the bearing
86
into the inner periphery of the cylindrical member
80
. Therefore, the rotating machine has a problem in that it is very difficult to assemble the machine.
In the pressing fitting process, furthermore, the outer race of the bearing
86
is press-inserted into the inner periphery of the cylindrical member
80
by pressing the inner ring of the bearing
86
. This produces another problem in that an impression is produced in a shoulder portion of a race surface in the bearing
86
.
SUMMARY OF THE INVENTION
The invention has been conducted in order to so
Kitamura Yutaka
Konishi Keiichi
Kusumoto Katsuhiko
Mizutani Tatsuhiko
Abdelnour Dennis
Marmor Charles A.
Mitsubishi Denki & Kabushiki Kaisha
Sughrue & Mion, PLLC
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