192 clutches and power-stop control – Clutches – Operators
Reexamination Certificate
2001-08-30
2003-06-17
Lorence, Richard M. (Department: 3681)
192 clutches and power-stop control
Clutches
Operators
C192S10700R, C335S279000
Reexamination Certificate
active
06578689
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electromagnetic clutch advantageously used, for example, in the air conditioning system of an automobile, and a compressor provided with this electromagnetic clutch.
2. Description of the Related
FIG. 8
is a cross-sectional drawing showing an example of a conventional electromagnetic clutch.
This electromagnetic clutch
100
is provided in the compressor of, for example, the air conditioning system of an automobile, and is mechanically and intermittently connected to the compressor and a drive source (not illustrated), and disposed in the nose part
101
of the front case of the compressor.
On the periphery of the nose part
101
, the drive rotor
103
is supported freely rotatably by the clutch bearings
102
, and a coil
104
is built into on this drive rotor
103
. An armature plate
105
having an identical axis line is disposed so as to oppose this drive rotor
103
. Moreover, the reference numeral
104
a
in the figure is the coil housing.
A hub
106
is anchored by a nut
107
on the projecting part of the drive axle
112
of the compressor. One end of the connection plate
108
is anchored to the hub
106
by the rivet
110
, and the other end is anchored to the armature plate
105
by the rivet
109
. The electromagnetic clutch
100
is formed having as essential components the clutch bearing
102
, the drive rotor
103
, the coil
104
, the armature plate
105
, the hub
106
, the connection plate
108
, and the rivets
109
and
110
described above.
In addition, a belt pulley
111
is provided on the periphery of the drive rotor
103
, and communicates with a drive source such as an engine via a V belt (not illustrated) that extends across thereto.
In the electromagnetic clutch
100
having the structure described above, the drive rotor
103
communicates with a drive source such as an engine, and thus is always rotating while the drive source is rotating. In this state, when current flows to the coil
104
and the coil
104
is energized, the armature plate
105
is engaged by the drive rotor
103
due to the magnetic force of the coil
104
. In addition, the rotational torque of the drive source is transmitted to the drive axle
112
by, in sequence, the drive rotor
103
, the armature plate
105
, the rivet
109
, the connecting plate
108
, the rivet
110
, and the hub
106
. Thereby, the drive axle
112
of the compression component is caused to rotate. When the current to the coil
104
is stopped in this state, the armature plate
105
is separated from the drive rotor
103
, and the power transmission to the drive axle
112
is interrupted.
However, in the electromagnetic clutch
100
of the compressor described above, the armature plate
105
is a single thick metal plate, and the drive rotor
103
is also made of metal, and formed as one body. In addition, when electricity flows through the coil
104
and the armature plate
105
is engaged by the drive rotor
103
due to the magnetic force of the coil
104
, the armature plate
105
is coupled to the drive rotor
103
at a high speed in order to minimize the duration of the relative slippage with the end surface of the drive rotor
103
. Thus, as described above, when current flows through the coil
104
, and the armature plate
105
and the drive rotor
103
are coupled by engagement due to energizing the coil
104
, there is the problem that a shock sound between the armature plate
105
and the end surface of the drive rotor
103
is produced, and decreasing this shock sound is desirable.
In this context, the inventors found that a laminated body in which a plurality of thin plates (plate body) are laminated to the walls that form the end surfaces of the armature plate and the drive rotor would be effective in decreasing the shock sound. However, to make this commercially viable, it is necessary to provide at a low cost a laminated body that comprises a plurality of laminated thin plates, and that can be reliably integrated. Furthermore, development of a laminated structure having an operability that is superior with respect to manufacture in a short period of time is desirable.
In consideration of the above described problems, it is an object of the present invention to provide an electromagnetic clutch and a compressor provided with this electromagnetic clutch that is effective in reducing the shock sound produced during the coupling of the armature plate and the drive rotor, and furthermore, having as an essential element a laminated body that can be provided at low cost.
SUMMARY OF THE INVENTION
In order to resolve the problems described above, in the present invention the following device was used.
In a first aspect of the invention, an electromagnetic clutch provides a drive rotor that is connected so as to communicate with a drive source and has a built in coil and an armature positioned opposite to said drive rotor, and having an armature plate disposed and on the same rotation axis line, in which the end surface of the drive rotor and the armature plate are engaged or separated due to the magnetic force of the coil when the coil is energized by the application of voltage, and the drive rotor and the armature are intermittently coupled in communication, wherein the armature plate is a laminated body comprising a plurality of plates, at least one of the outer surface plate or the inner surface plate of the laminated body that serves as a friction surface has a plurality of fastening tongues protruding therefrom, and the laminated body is integrated by the fastening tongues being bent so as to surround the other laminated plates such that they are fastened.
According to this type of electromagnetic clutch, because the laminated body is integrated by the fastening tongue being bent so as to surround the other laminated plates such that they are fastened, a reliably integrated laminated body is easily obtained, and furthermore, because the operability is superior in comparison to integration by welding, etc., manufacture is possible in a short period of time and at a low cost.
The fastening tongue in this case can either be (1) provided only on the outer surface plate, (2) provided only on the inner surface plate, or provided on both the outer surface plate and the inner surface plate.
In a second aspect of the invention, an electromagnetic clutch provides a drive rotor that is connected so as to communicate with a drive source and has a built in coil and an armature positioned opposite to said drive rotor, and having an armature plate disposed and on the same rotation axis line, in which the end surface of the drive rotor and the armature plate are engaged or separated due to the magnetic force of the coil when the coil is energized by the application of voltage, and the drive rotor and the armature are intermittently coupled in communication, wherein the armature plate is a laminated body comprising a plurality of laminated plates, cylindrical bar-ring integrating parts are provided on the plate of one end surface side and through holes are provided on the other plates, and the laminated body is integrated by inserting and fastening the bar-ring integrating parts into the through holes.
According to this type of electromagnetic clutch, because the laminated body is integrated by inserting and fastening the bar-ring integrating parts into the through holes, a reliably integrated laminated body can be manufactured in a short period of time period and at a low cost.
In this case, the bar-ring integrating parts inserted into the through holes do not project from the through holes, and are fastened on the inside by expanding the diameter, or similarly, the diameter is expanded and the distal end of the bar-ring integrating parts project from the through holes and are bent so as to attach to the end surface on the opposite side.
Moreover, in the fastening structure in which the bar-ring integrating parts do not project out of the through holes, there is no restriction on which plate on the end surface side prov
Andoh Hirohide
Azuma Yoshikatsu
Hattori Makoto
Kawada Minoru
Lorence Richard M.
Mitsubishi Heavy Industries Ltd.
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