Abstract: A variable displacement swash plate compressor includes a swash-plate boss (50) permitting a rotary shaft to extend therethrough and coupled to the rotary shaft so as to be tiltable relative to the rotary shaft, the swash-plate boss having a thread groove (78) cut in an outer peripheral surface thereof, an annular swash plate (60) fitted around the swash-plate boss (50), a nut (64) screwed on the thread groove (78) of the swash-plate boss (50) to fix the swash plate (60) to the swash-plate boss (50), a conversion device for converting rotating motion of the swash plate (60) to reciprocating motion of pistons, and engaging protuberances (68) formed integrally with the nut (64) and protruding in a direction parallel with the axis (A) of the nut (64) to be engaged with a tool (80) for turning the nut (64).

Abstract: A reciprocating fluid machine (2) includes pistons (32) reciprocated in respective cylinder bores (40). Each piston includes, as a lateral surface (32a) thereof, a cylindrical section (64) disposed in sliding contact with the corresponding cylinder bore with a coating layer (66) therebetween, ring groove sections (68) fitted with respective piston rings (34), and tapered sections (70) each formed between the cylindrical section and the corresponding ring groove section and inclined from the cylindrical section toward the ring groove section so as to be gradually set apart from the cylinder bore. The coating layer is also formed on each tapered section in such a manner as to be gradually set apart from the cylinder bore.

Abstract: Disclosed is a variable displacement compressor having improved compressor performance such as reduced pulsation and improved durability and resistance to pressure and allowing smooth and high-precision control of a swash plate tilt angle at a target tilt angle by using an axial movement member.

Abstract: A variable displacement compressor having a swash plate capable of being changed with inclination angle for converting the rotation of a drive shaft into the reciprocating motion of pistons comprises a plurality of urging means each having one end brought into contact with the swash plate and urging the swash plate in the direction of increasing an inclination angle of the swash plate, wherein the plurality of urging means are constructed so that the number of urgings is increased as the inclination angle of the swash plate is decreased. The freedom of adjustment of the urging force due to the urging means for increasing the inclination angle of the swash plate can be enlarged by a simple structure, and the urging force can be finely adjusted in accordance with the inclination angle of the swash plate.

Abstract: A shaft sealing device (80) that partitions a high-pressure zone and a low-pressure zone from each other in a fluid machine has an elastic member (86) including a seal portion (88) that is brought into sliding contact with a seat face of a contact-target member that is either a rotary shaft (60) or a casing (12), and a case (82) that supports the elastic member (86). The elastic member (86) has a first elastic portion that continues to a high-pressure side boundary of the seal portion (88), which is located in the high-pressure zone side, and a second elastic portion that continues to a low-pressure side boundary of the seal portion (88), which is located in the low-pressure zone side. The case (82) restrains regions of the first and second elastic portions, the regions being located away from the seal portion (88).

Abstract: A variable displacement swash plate compressor includes a swash-plate boss (50) permitting a rotary shaft to extend therethrough and coupled to the rotary shaft so as to be tiltable relative to the rotary shaft, the swash-plate boss having a thread groove (78) cut in an outer peripheral surface thereof, an annular swash plate (60) fitted around the swash-plate boss (50), a nut (64) screwed on the thread groove (78) of the swash-plate boss (50) to fix the swash plate (60) to the swash-plate boss (50), a conversion device for converting rotating motion of the swash plate (60) to reciprocating motion of pistons, and engaging protuberances (68) formed integrally with the nut (64) and protruding in a direction parallel with the axis (A) of the nut (64) to be engaged with a tool (80) for turning the nut (64).

Abstract: A reciprocating fluid machine (2) includes pistons (32) reciprocated in respective cylinder bores (40). Each piston includes, as a lateral surface (32a) thereof, a cylindrical section (64) disposed in sliding contact with the corresponding cylinder bore with a coating layer (66) therebetween, ring groove sections (68) fitted with respective piston rings (34), and tapered sections (70) each formed between the cylindrical section and the corresponding ring groove section and inclined from the cylindrical section toward the ring groove section so as to be gradually set apart from the cylinder bore. The coating layer is also formed on each tapered section in such a manner as to be gradually set apart from the cylinder bore.

Abstract: A reciprocating fluid machine includes a cylinder block (18) arranged inside a casing shell (16) and having cylinder bores (38), a cylinder head (54) fastened to the casing shell (16), a valve plate (50) interposed between the cylinder block (18) and the cylinder head (54) each with a gasket (46, 48, 52) therebetween, and a fastening device for fastening the valve plate (50) to the cylinder block (18). The fastening device includes outer tapped holes (42) formed in the cylinder block (18), and outer fastening bolts (68) extending from the cylinder head side through the valve plate (50) and the gaskets (46, 48, 52) and screwed into the respective outer tapped holes (42). The outer fastening bolts (68) have axes located outward of a bore distribution circle on which the axes of the cylinder bores (38) are located, as viewed in the radial direction of the cylinder block (54), and have bolt heads (69) located inside the cylinder head (54).

Abstract: A compressor of the present invention having an electromagnetic clutch (14) for transmitting a driving force from a driving source (15) to a rotary shaft (4), in which the clutch (14) includes a rotor (16) rotated by receiving the driving force of the driving source (15), the rotor (16) containing an electromagnetic solenoid (22), a hub (48) fixed to the rotary shaft (4), and a clutch mechanism (24) capable of connecting the rotor (16) and the hub (48) to each other; the clutch mechanism (24) has an armature (26) attracted to the rotor (16) when the solenoid (22) is in an operating state, an inner support (31) coupled to the hub (48), and a shim (62) sandwiched between the inner support (31) and the hub (48); and the shim (62) determines the size of a gap (L) to be secured between the rotor (16) and the armature (26) when the solenoid (22) is in a resting state.

Abstract: A variable-displacement inclined plate compressor includes a drive shaft, a rotor provided on the drive shaft, and an inclined plate provided around the drive shaft and rotated synchronously with the drive shaft via the rotor. The compressor comprises a cam mechanism provided between the rotor and the inclined plate for controlling an inclination angle of the inclined plate relative to an axis of the drive shaft. The cam mechanism comprises a ball located between the rotor and the inclined plate. The cam mechanism prevents improper assembly and facilitates the efficient management of the assembly. Further, the cam mechanism facilitates the processing of parts and the decrease in the number of parts, thereby reducing the manufacturing cost.

Abstract: Discharge holes and suction holes having shapes that suppress the turbulence of a refrigerant gas flow are disclosed. The shape of the discharge hole according to the present invention has a tapered surface wall, such that the circumference of the discharge hole increases from the piston cylinder surface to the discharge chamber surface. Similarly, the shape of the suction hole according to the present invention has a tapered surface wall such that the circumference of the suction hole increases from the suction chamber surface to the piston cylinder surface. The present invention allows the flow path of the refrigerant gas to flow approximately tangential to the valve reed by providing a tapered surface wall. The flow resistance of the discharge hole or the suction hole is reduced such that the volume efficiency of the compressor is improved and compressor noise is suppressed.