192 clutches and power-stop control – Clutches – Operators
Reexamination Certificate
2000-11-29
2003-01-14
Rodriguez, Saul (Department: 3681)
192 clutches and power-stop control
Clutches
Operators
C192S11000B, C418S055100
Reexamination Certificate
active
06505725
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an electromagnetic clutch device for a compressor used for air conditioners on vehicles and so forth.
2. Background Art
A conventional electromagnetic clutch device for a compressor incorporated in air conditioners on vehicles and so forth is known, for example, from Japanese Patent Application Laid-Open No. Hei 9-53662, and the device will be briefly explained below with reference to FIG.
2
.
In the compressor shown in
FIG. 2
having an electromagnetic clutch device, a housing
1
comprises cup-shaped body
2
and a front case
4
fastened to the body
2
by means of bolts (not shown).
A scroll type compressing mechanism C consisting of a fixed scroll
10
and a revolving scroll
14
is accommodated in the housing
1
. The fixed scroll
10
comprises an end plate
11
fastened to the cup-shaped body
2
by bolts
13
and whorled wraps
12
which are formed on the inner surface of the end plate
11
. The revolving scroll
14
comprises an end plate
15
and whorled wraps
16
which are formed on the inner surface of the end plate
15
. The revolving scroll
14
and the fixed scroll
10
engage each other in such a way that their centers are separated from each other by the radius of their revolution and the phase difference between them is 180 degrees. As a result, a plurality of sealed chambers
19
a
and
19
b
are formed substantially symmetrically about the center of the whorls of the scrolls.
A cylindrical boss
20
is formed at the center of the outer surface of the end plate
15
in which a drive bush
21
is rotatably accommodated via a revolving bearing
23
. The drive bush
21
has an eccentric hole
24
in which an eccentric drive pin
25
projecting from a drive shaft
7
toward the inside of the housing
1
is rotatably engaged. The drive shaft
7
extends to the outside of the housing
1
through a nose
6
of the front case
4
and is supported in the front case
4
by means of bearings
8
and
9
.
A drive rotor
42
is rotatably supported on the circumference of the nose
6
of the front case
4
by means of a clutch bearing
41
. The drive rotor
42
accommodates coil
43
toward which an armature plate
49
faces. A hub
44
is fixedly connected to a projecting end of the drive shaft
7
by means of a nut
45
. One end of each leaf spring
46
is connected to the hub
44
by pin
47
and the other end of each leaf spring
46
is fixed to the armature plate
47
by pin
48
. An electromagnetic clutch device CL is formed by the clutch bearing
41
, the drive rotor
42
, the coil
43
, the hub
44
, the leaf springs
46
, the pins
47
and
48
, and the armature plate
49
as described above.
Pulley grooves
61
are formed on the outer periphery of the drive rotor
42
which is connected to a power source such as an engine via a V-belt or the like (not shown) which is laid on the pulley grooves
61
so as to be driven whenever the power source is in operation. When electric current is supplied to the coil
43
, the armature plate
49
becomes attached to the drive rotor
42
due to magnetic force after overcoming the resilient force of the leaf springs
46
. As a result, the drive shaft
7
of the scroll type compressing mechanism starts to rotate since rotation of the drive rotor
42
is transmitted to the drive shaft
7
via the armature plate
49
, pins
48
, leaf springs
46
, pins
47
and hub
44
in this sequence. In this state, when the electric current is cut off, the armature plate
49
detaches from the drive rotor
42
due to the restoring force of the leaf springs
46
, thus, the power transmission to the drive shaft
7
ceases.
When the drive shaft rotates, the revolving scroll
14
is driven via the eccentric drive pin
25
, the drive bush
21
, revolving bearing
23
and the boss
20
. The revolving scroll
14
revolves on a circular orbit while its rotation is prevented by an anti-rotation mechanism
26
. As a result, the contact lines between the whorled wraps
12
and
16
move toward the center of the whorl, at the same time, the sealed chambers
19
a
and
19
b
move toward the center of the whorl while their volumes are decreasing. Simultaneously, a refrigerant gas is sucked into an inlet chamber
28
through an inlet port (not shown), moves into the sealed chambers
19
a
and
19
b
via outer openings of the whorled wraps
12
and
16
, reaches a center chamber
19
c
while being compressed, further moves through an outlet port formed in the end plate
11
of the fixed scroll
10
, opens an outlet valve
30
by its pressure, moves into an outlet cavity
31
, and then, goes out through an outlet port
37
. In
FIG. 2
, reference numeral
35
indicates a retainer for the outlet valve
30
;
36
indicates a bolt for fixing the outlet valve
30
and the retainer
35
;
38
indicates sealing parts;
27
indicates a balance weight fixed to the drive bush
21
;
39
indicates a balance weight fixed to the drive shaft
7
; and
22
indicates a thrust bearing.
In the electromagnetic clutch device for a compressor constructed in the above-mentioned manner, it is required that the pulley grooves
61
be formed on the outer periphery of the drive rotor
42
, the outer periphery is located to the outside of the coil
43
, when the distance between the compressor body (housing) and the drive rotor
42
(in general, this distance is referred to as an alignment) needs to be reduced due to requirements for arranging other parts on the vehicle. When the rotational speed of the compressor needs to be increased, the diameter of the drive side pulley attached to a power source, such as an engine, must be increased because the diameter of the drive rotor
42
(pulley) cannot be reduced due to the coil
43
accommodated in it.
However, it is generally difficult to have sufficient space in order to enlarge the drive side pulley. In addition, an enlarged pulley leads to a weight increase and to a cost increase. Therefore, it is almost impossible to increase the rotational speed of the compressor, which means that the cooling capacity of the air conditioner cannot be increased either.
SUMMARY OF THE INVENTION
The object of the present invention is to overcome the above-mentioned disadvantages of the prior art and to provide an electromagnetic clutch device whose pulley can be downsized without any restrictions from the outer diameter of a coil even when the alignment is small.
In order to achieve the object, the present invention incorporates the structure described below.
An electromagnetic clutch device for a compressor according to claim 1 comprises a drive shaft forming a part of a compressor mechanism which is accommodated in a housing of the compressor and projecting through a nose of the housing; a drive rotor accommodating a coil for the electromagnetic clutch and rotatably supported on the circumference of the nose by means of a clutch bearing; an armature plate opposing the coil and connected to a projecting end of the drive shaft so as to rotate with the drive shaft; and a pulley fixedly attached to the drive rotor, wherein the pulley is arranged between the housing and the coil.
With this electromagnetic clutch device for a compressor, it is possible to select the diameter of the pulley without having any restrictions on the outer diameter of the coil.
An electromagnetic clutch device for a compressor according to claim 2 comprises a drive shaft forming a part of a compressor mechanism which is accommodated in a housing of the compressor and projecting through a nose of the housing; a drive rotor accommodating a coil for the electromagnetic clutch and rotatably supported on the circumference of the nose by means of a clutch bearing; an armature plate opposing the coil and connected to a projecting end of the drive shaft so as to rotate with the drive shaft; and a pulley fixedly attached to the drive rotor, wherein the pulley is arranged between the housing and the coil and the diameter of the pulley is smaller than that of the drive rotor.
With this electromagnetic clutc
Kawada Minoru
Tanigaki Ryuhei
Watabe Shin
Mitsubishi Heavy Industries Ltd.
Rodriguez Saul
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