Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Patent
1996-08-08
1998-08-25
Freay, Charles G.
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
417269, 74 60, 91499, F04B 112
Patent
active
RE0358789
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a variable capacity swash plate type refrigerant compressor mainly used for an airconditioner for a car. More particularly, it relates to a variable capacity single headed piston swash plate type compressor provided with a double fulcrum hinge mechanism able to pivotally support a variable inclination swash plate assembly while preventing an application of an excessive load to a sleeve element on which the variable inclination swash plate assembly is turnably mounted.
BACKGROUND ART
Japanese Unexamined (Kokai) Utility Model Publication No. 62-183082, published on Nov. 20, 1987 by the Japanese Patent Office, discloses a variable capacity swash plate type compressor having single headed pistons therein. The variable capacity swash plate type compressor of Japanese Unexamined Utility Model Publication '082 includes a cylinder block having a crank chamber formed therein for housing an inclination changeable wobble plate assembly, and a plurality of cylinder bores in which a plurality of single headed pistons are reciprocally fitted, to suck and compress a refrigerant gas and to discharge the compressed refrigerant gas. The wobble plate assembly includes a rotary drive element rotatable with the drive shaft and a swash plate non-rotatably supported on the rotary drive element, and is driven by a rotatably supported axial drive shaft to which a lug member is fixedly attached to be projected radially and rotated together with the drive shaft within the crank chamber. The lug member is operatively connected to the rotary drive element of the wobble plate assembly via a hinge mechanism, and a sleeve element slidably mounted on the drive shaft is also operatively connected to the rotary drive element of the wobble plate assembly. Namely, the rotary drive element is able to be rotated together with the drive shaft and to change an angle of inclination thereof from an erect position corresponding to a small compression capacity position to a fully inclined position corresponding to a large compression capacity position. The hinge mechanism includes an elongated guide hole bored through the lug member, and a hinge pin having one end movably fitted in the elongated guide hole of the lug member and the other end fixed to a swing plate member extended from the rotary drive plate. The sleeve element is arranged to be axially slid, and provided with a lateral pin radially projected therefrom to form trunnion pins about which the rotary drive plate is pivotally mounted. The swash plate of the wobble plate assembly is operatively connected to the plurality of pistons via respective piston rods having ball-and-socket joints on both ends, and thus, when the drive shaft is rotated, the rotation of the drive shaft and the rotary drive element is converted into a reciprocation of the respective pistons in the cylinder bores. The cylinder block has a communication passageway formed therein and extended between the crank chamber and a suction chamber, for receiving therein the refrigerant gas before compression and an extent of the communication between the abovementioned two chambers is controlled by a capacity control valve.
With the above-mentioned compressor, when the respective pistons are reciprocated in response to the rotation of the drive shaft, the refrigerant gas before compression is pumped from the suction chamber into the cylinder bores, to be compressed by the pistons during the suction and compression strokes of the pistons, and the compressed gas is discharged from the cylinder bores toward a discharge chamber for the refrigerant gas after compression. During the operation of the compressor, a force consisting of first and second forces acts on the wobble plate assembly from the pistons, as a reaction of the compression and suction of the refrigerant gas by the pistons, and the wobble plate assembly is physically supported by the hinge mechanism at a fulcrum position thereof at which the hinge pin is in contact with the guide wall of the elongated guide hole of th
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Kayukawa Hiroaki
Kimura Kazuya
Freay Charles G.
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
Korytnyk Peter G.
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