Pumps – Three or more cylinders arranged in parallel – radial – or...
Patent
1992-11-03
1994-05-31
Bertsch, Richard A.
Pumps
Three or more cylinders arranged in parallel, radial, or...
4172221, 74 60, 92 122, F04B 2708
Patent
active
053164466
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a variable capacity wobbling swash plate type compressing apparatus, and more particularly, to a variable capacity wobbling swash plate type compressing apparatus suitable for use in an air-conditioning system of an automobile.
BACKGROUND ART
Japanese Unexamined (Kokai) Patent Publication No. 60-175783 and Japanese Unexamined (Kokai) Utility Model Publication No. 62-183082 disclose a typical wobble plate type variable capacity compressing apparatus. The disclosed apparatus is provided with a housing, a cylinder block housed in the housing and a drive shaft arranged so as to axially extend along the longitudinal axis of the housing. The cylinder block has a plurality of cylinder bores that are arranged radially with respect to the axis of the drive shaft and equidistantly to one another. Each of the cylinder bores is communicated with suction and discharge chambers, respectively, via respective reed valves. The suction and discharge chambers of the compressor communicate with a condenser and an evaporator of an air-conditioner of an automobile, respectively.
Each of the cylinder bores receives a piston to be reciprocated therein, and during the suction stroke of the piston, a refrigerant gas sent from the condenser to the suction chamber enters the cylinder bores via the reed valves. The refrigerant gas is subsequently compressed in the cylinder bores during the compressing stroke of the pistons, and the compressed refrigerant is discharged toward the discharge chamber via the reed valves. The compressed refrigerant is then delivered from the discharge chamber of the compressor to the evaporator of the air-conditioning system.
In order to reciprocate the pistons in the cylinder bores, a swash plate is arranged, in a crank chamber of the housing so as, to be slidably engaged with the pistons. Namely, the swash plate is engaged with pistons in a manner such that the rotation of the swash plate causes reciprocation of the pistons. The swash plate is supported and slidable with respect to the drive shaft, and can wobble about an axis perpendicular to the axis of the drive shaft. Further, the angle of inclination of the swash plate can be adjustably changed to control the stroke of the pistons, i.e., the compression capacity of the compressor.
The swash plate is connected to a rotary drive member fixed to the drive shaft via a hinge means to thereby obtain a drive force from the drive shaft, and the hinge means includes a connecting pin element supported by the swash plate. The connecting pin element is engaged in an elongated arcuate hole formed in the rotary drive element. The connecting pin element of the hinge means is moved in the arcuate hole when the angle of inclination of the swash plate is adjusted, and acts as a fulcrum about which the swash plate is moved to change the angle of inclination thereof.
The adjustment of the angle of inclination of the swash plate is performed by changing the pressure level of the refrigerant gas prevailing in the crank chamber, which is in fluid communication with the suction chamber and/or the discharge chamber via an appropriate control valve. Namely, when the pressure level in the crank chamber is lowered by the control valve, pressure acting on the back of each piston is lowered to increase the angle of inclination of the swash plate to thereby expand the stroke of each piston. As a result, the compression capacity of the compressor increases.
On the contrary, when the pressure level within the crank chamber is increased by the control valve, the pressure acting on the back of each piston is accordingly increased to reduce the piston stroke thereby decreasing the angle of inclination of the swash plate. Thus, the compression capacity of the compressor becomes small.
As described above, when the swash plate is moved so as to change the angle of inclination thereof, the movement of the swash plate is conducted with respect to the fulcrum provided by the connecting pin element of the hinge means, and the fulcrum per s
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Kayukawa Hiroaki
Kimura Kazuya
Bertsch Richard A.
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
Korytnyk Peter
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