Abstract: An improvement of a piston type compressor is disclosed. The compressor has a cylinder block that includes a plurality of cylinder bores and a plurality of suction passages. Each of the suction passages extends through the cylinder block to connect a crank chamber with a suction chamber. The suction chamber is connected with the cylinder bores via a plurality of suction ports located in association with the cylinder bores. Each cylinder bore accommodating a piston that moves therein to circulate gas between the compressor and an external gas circuit. The gas introduced into the crank chamber from the external gas circuit is supplied to the suction chamber through each suction passage and is supplied from the suction chamber to each cylinder bore through an associated suction port. The suction passages are smaller in number than the cylinder bores. The suction ports are disposed in the vicinity of an opening of the suction passages.

Abstract: A piston for a compressor. The piston has a lubricating coating that slidably contacts with an inner surface of the cylinder bore. The layer is formed on the surface of the piston. The layer is formed by transferring a liquid material to the surface of the piston using printing techniques such as screen printing and roller coating.

Abstract: A compressor is described having front and rear cylinder blocks coupled to each other with a crank chamber defined therebetween. A swash plate is mounted on a drive shaft in the crank chamber. Double-headed pistons reciprocate in pairs of aligned cylinder bores. The swash plate divides the crank chamber into a plurality of sections. Holes formed in the swash plate permit flow of the refrigerant between the chamber sections. Recesses are formed radially inward and outward of a cam shoe contacting surface of the swash plate.

Abstract: A double-headed swash-plate operated reciprocating piston type refrigerant compressor having front and rear cylinder blocks provided with axial cylinder bores for receiving the double-headed pistons reciprocated by a swash plate mounted on an axial drive shaft rotating about an axis of rotation thereof together with the swash plate which is axially and rigidly supported by front and rear thrust bearing assemblies including an elastic unit arranged between the thrust bearing of at least one of the front and rear thrust bearing assemblies and a pressure receiving seat formed in the shoulder portion of the swash plate, the elastic unit providing the swash plate with a axial mechanical support having a rigidity which changes in a stepwise manner in response to a change in a discharge pressure of the refrigerant compressed by the compressor.

Abstract: A reciprocating piston type compressor for compressing refrigerant gas is provided with a main housing which includes a plurality of parallel cylinder bores arranged around the longitudinal axis of the cylinder block. The main housing has first and second cylinder blocks connected to each other by a plurality of bolts, the cylinder blocks including inner clamping faces and abutting faces. A plurality of pistons are slidably provided within the cylinder bores. An axially extending drive shaft is supported by the main housing for rotation through a pair of bearings. A swash plate is mounted on the drive shaft for rotation with the drive shaft. A pair of thrust bearings are provided between the swash plate and the inner clamping faces of the cylinder blocks to clamp and hold the swash plate therebetween. The clamping force on the thrust bearings from the inner clamping faces is controlled so that the clamping force does not exceed a predetermined allowable upper limit when the compressor is assembled.

Abstract: A refrigerant compressor, typically a swash plate type refrigerant compressor for compressing refrigerant gas containing therein lubricating oil, which has axially combined cylinder blocks having a plurality of cylinder bores in which a plurality of pistons reciprocate to implement suction and compression of refrigerant gas as well as discharge of the compressed refrigerant gas. The cylinder blocks further have a swash plate chamber for a swash plate supported by a sliding type thrust bearings, receiving the refrigerant gas returning from an exterior of the compressor, and an axially extending central through-bore for a drive shaft supported by radial bearings. The compressor has a lubricating oil system which includes a fluid passageway for supplying a part of the refrigerant gas containing the lubricating oil from refrigerant gas inlet passageways in the cylinder blocks into the central bore to lubricate the sliding type thrust bearings and the radial bearings.

Abstract: A swash plate type compressor includes an improved thrust bearing for axially supporting the swash plate. The bearing is of a composite type, and includes at least two elastically deformable slide bearing elements. The swash plate and the cylinder block each have seat portions, which are of different diameters. The two bearing elements are compressed between the respective seat portions into an elastically deformed conically-shaped state, with the amount of conical deformation depending upon the amount of axial compression that is applied to the bearing by tightening the assembly bolts of the compressor. In operation, one of the conically shaped slide bearing elements is pressed outwardly against the other by centrifugal force as the compressor shaft rotates. During start up and low speed operation of the compressor, this centrifugal force will have minimal effect, and the bearing elements will rotate with respect to each other, keeping internal frictional resistance low.

Abstract: A cam plate type compressor includes a cam plate having a boss and the cam plate is located in a crank chamber formed within a pair of casings. The cam plate is rotatable with a drive shaft. The compressor also has two-part bearing structure for supporting the cam plate. The bearing has a buffer structure for absorbing an axial load applied to the cam plate. One of the bearing parts is constituted by a rolling bearing and the other is constituted by a flat sliding bearing.

Abstract: A compressor includes a housing body and a drive shaft rotatably supported in the housing body. A drive plate is mounted on the drive shaft. Cylinder bores are defined in the housing body. Pistons are operably coupled to the drive plate and are disposed in the cylinder bores. The drive plate converts rotation of the drive shaft to reciprocating movement of the pistons in the cylinder bores. Each piston compresses gas supplied from a suction chamber to the associated cylinder bore and discharges the compressed gas to a discharge chamber. Force to minimize displacement of the drive shaft in the axial direction thereof adjusts in accordance with at least one of pressure in the discharge chamber and a rotation speed of the drive shaft.

Abstract: A swash plate type compressor including double headed pistons, a swash plate, and a drive shaft which is rotatably supported by radial bearings and thrust bearings. A boss on the swash plate has front and rear supporting seats and the cylinder block have front and rear supporting seats in a facing relationship with the front and rear supporting seats of the swash plate. One thrust bearing is rigidly arranged between the facing supporting seats. The other thrust bearing is held between the other facing supporting seats, with a belleville spring arranged between the thrust bearing and the supporting seat of the boss.

Abstract: A reciprocating piston type compressor having a cylinder block, a plurality of cylinder bores, and at least a housing closing an end of the cylinder block. The housing contains a suction chamber for a refrigerant gas to be compressed and a discharge chamber for the compressed refrigerant gas discharged from the cylinder bores in response to reciprocation of a plurality of pistons. The compressed gas is discharged through discharge ports closed by a discharge valve element having a plurality of integral discharge reed-valves movable between a closed positions and a predetermined open positions. The open position is defined by a stop unit integrally formed in an inner wall of the housing. The stop unit has a plurality of flat stop faces formed on the inner wall to permit free ends of the discharge reed-valves to come into contact engagement therewith, when the discharge reed-valves are moved from the closed positions to the open positions.

Abstract: A multi-piston type refrigerant compressor having a cylinder block unit in which a plurality of cylinder bores receiving a plurality of reciprocating pistons for sucking a refrigerant gas, compressing the refrigerant gas, and discharging the compressed refrigerant gas, and a piston reciprocating actuating mechanism are housed, and a muffling unit defined by upright walls integral with the cylinder block unit and including a suction pulsation damping chamber, a discharge pulsation damping chamber, and an arrangement in which the covering plate of the muffling chamber, having ports formed so as to fluidly connect suction and delivery gas pipes to the muffling chamber, is arranged to be inclined, with respect to a horizontal plane, towards one of the cylinder block units.

Abstract: A swash plate type compressor incorporating therein a swash plate having an annular rail raised from each flat face thereof for providing a sliding-contact surface being in contact with sliding-contact surface portions of respective shoes which constitute a rotation-to-reciprocation conversion unit arranged between the swash plate and double-headed pistons reciprocating axial cylinder bores of the compressor. The sliding-contact surfaces of respective shoes bulge outward and have a radius of curvature "R" in the range of 800 through 1600 millimeters which is smaller than that of the conventional shoes of a swash plate type compressor, so that relatively large wedge shaped gaps are formed between the respective shoes and the swash plate to thereby stably and constantly hold lubricating oil.