Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Reexamination Certificate
2000-03-10
2002-11-05
Joyce, William C (Department: 3682)
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
C074S839000, C092S071000, C417S222100
Reexamination Certificate
active
06474183
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a variable-displacement inclined plate compressor, and, more specifically, to a variable-displacement inclined plate compressor with an improved structure for a cam mechanism provided between a rotor and an inclined plate in the compressor.
2. Description of Related Art
Variable-displacement inclined plate compressors are known in the art. Variable-displacement inclined plate compressors are used, for example, in a refrigerating cycle of an air conditioner for vehicles. A known structure of a variable-displacement inclined plate compressor is constructed as depicted in FIG.
22
. In
FIG. 22
, variable-displacement inclined plate compressor
100
has cylinder block
103
forming an outline of compressor housing
102
, and front housing
105
closing one end of cylinder block
103
. Cylinder block
103
includes a plurality of cylinder bores
101
. The space enclosed by cylinder block
103
and front housing
105
forms crank chamber
104
. Cylinder head
107
is attached to the other end of cylinder block
103
via valve plate
106
.
Drive shaft
110
is provided to extend from the outside of front housing
105
to the inside of cylinder block
103
through boss portion
105
a
of front housing
105
and crank chamber
104
. One end portion of drive shaft
110
is rotatably supported by bearing
108
, which is provided in boss portion
105
a
of front housing
105
. The other end portion of drive shaft
110
is rotatably supported by bearing
109
, which is provided in through hole
103
a
defined in the central portion of cylinder block
103
to extend in the same direction as the axis of drive shaft
110
. Seal member
147
is provided between boss portion
105
a
of front housing
105
and drive shaft
110
.
Inclined plate
112
is provided around drive shaft
110
in crank chamber
104
. Inclined plate
112
is slidably provided on drive shaft
110
via cylindrical sleeve
111
, and rotatably attached to sleeve
111
via pin
111
b
and opening
111
a
(FIG.
23
). Inclined plate
112
is rotated synchronously with drive shaft
110
via rotor
116
attached to drive shaft
110
. Inclined plate
112
is variable in its inclination angle. Wobble plate
113
is provided around inclined plate
112
. Wobble plate
113
is supported by inclined plate
112
via bearings
141
and
142
so that inclined plate
112
can rotate relative to wobble plate
113
. The rotation of wobble plate
113
is prevented by rotation preventing mechanism
150
. Rotation preventing mechanism
150
comprises guide member
144
extending along the axis direction of drive shaft
110
in crank chamber
104
, and engaging member
143
provided on the outer surface of wobble plate
113
for slidably engaging guide member
144
. Spring
146
is provided around drive shaft
110
between inclined plate
112
and cylinder block
103
. The rotational motion of drive shaft
110
is changed to the wobble motion of wobble plate
113
via rotor
116
and inclined plate
112
.
Piston
114
is inserted into each cylinder bore
101
. Piston
114
is connected to wobble plate
113
via piston rod
115
. One spherical end portion
115
a
of piston rod
115
is contained in spherical hollow portion
114
a
formed in piston
114
. The other spherical end portion
115
b
of piston rod
115
is contained in spherical hollow portion
113
a
formed on the side surface of wobble plate
113
.
Rotor
116
has arm
116
a
extending in a radially outward direction within a plane which includes the axis of drive shaft
110
, and pivot pin
116
b
extending in a direction across the extending direction of arm
116
a
. Rotor
116
is rotatably supported on inner wall surface
105
b
of front housing
105
via thrust bearing
145
. Inclined plate
112
has sleeve portion
112
a
projecting toward the side of rotor
116
. Slot
112
b
engaging pivot pin
116
b
is defined in sleeve portion
112
a.
Electromagnetic clutch
120
is provided around boss portion
105
a
for transmitting/interrupting a driving force from an external drive source to drive shaft
110
. Electromagnetic clutch
120
comprises electric magnet
123
disposed in pulley
122
, which is provided on boss portion
105
a
via bearing
121
, clutch plate
125
provided to face one end surface of pulley
122
, and fastener
126
for fixing clutch plate
125
to the end of drive shaft
110
.
Discharge chamber
132
and suction chamber
133
are defined in cylinder head
107
, respectively, by separating the inside of cylinder head
107
, closed by valve plate
106
, by outer wall
131
a
, bottom wall
131
b
and inner wall
131
c
. Discharge chamber
132
communicates with discharge port
134
, which is formed on the wall of cylinder head
107
, and discharge port
106
a
, which is formed on valve plate
106
. Suction chamber
133
communicates with suction port
135
, which is formed on the wall of cylinder head
107
, and suction port
106
b
, which is formed on valve plate
106
. A suction valve (not shown) is provided on suction port
106
b
to cover suction port
106
b
. A discharge valve (not shown) and retainer
106
c
are provided on discharge port
106
a
in discharge chamber
132
to cover discharge port
106
a
. Control valve
117
is provided between crank chamber
104
and discharge chamber
132
. Pressure control valve
117
adjusts the inclination angle of inclined plate
112
by adjusting the pressure in crank chamber
104
, thereby controlling the stroke of piston
114
. Thus, the displacement of the compressor is controlled by control valve
117
.
In such a variable-displacement inclined plate compressor
100
, when drive shaft
110
rotates, rotor
116
rotates. By the rotation of rotor
116
, inclined plate
112
rotates around drive shaft
110
, including wobble movement in a plane containing the axis of drive shaft
110
. The rotational motion including the wobble movement of inclined plate
112
is transformed into the wobble movement of wobble plate
113
in the plane containing the axis of drive shaft
110
. The wobble movement of wobble plate
113
is transformed into the reciprocal movement of piston
114
in a direction along the axis of drive shaft
110
via piston rod
115
. When piston
114
moves from the position depicted in
FIG. 22
to a position of the crank chamber side (left side), the fluid is drawn from suction port
135
into cylinder bore
101
through suction chamber
133
and suction port
106
b
. Thereafter, when piston
114
moves toward the cylinder head side (right side), the fluid in cylinder bore
101
is compressed. The compressed fluid is discharged from cylinder bore
101
to the outside of the compressor through discharge port
106
a
, discharge chamber
132
and discharge port
134
.
FIG. 23
depicts an exploded view of the cam mechanism including rotor
116
and inclined plate
112
in compressor
100
.
FIG. 24
is a plan view of the assembled cam mechanism depicted in
FIG. 23
, and
FIGS. 25 and 26
are sectional views of the cam mechanism showing the respective operational conditions.
As depicted in
FIG. 23
, rotor
116
is fixed to drive shaft
110
. Pins
111
b
are inserted from the inside of sleeve
111
in the directions opposite to each other as shown by arrows, and inserted into respective holes
112
d
, which are defined on the inner surface of through hole
112
c
formed in the central portion of inclined plate
112
. After sleeve
111
is fixed in through hole
112
c
of inclined plate
112
, drive shaft
110
is inserted into sleeve
111
.
As depicted in
FIGS. 23 and 24
, sleeve portion
112
a
of inclined plate
112
is inserted between arm portions
116
a
of rotor
116
. Washers
112
e
are interposed between sleeve portion
112
a
and both arm portions
116
a
. Pivot pin
116
b
is inserted through a series of holes, which are formed by holes
116
c
in arm portions
116
a
, the holes of washers
112
e
and slot
112
b
in sleeve portion
112
a
. Snap rings
116
d
are provided on both end portions of pivot p
Baker & Botts L.L.P.
Joyce William C
Sanden Corporation
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