A piston compressor includes a housing, a drive shaft, a fixed swash plate, a plurality of pistons, a movable body, and a control valve. The housing includes a cylinder block having a plurality of cylinder bores and a plurality of first communication passages. The movable body has a second communication passage that intermittently communicates with each of the first communication passages by rotation of the drive shaft. A flow rate of refrigerant discharged from a compression chamber into a discharge chamber changes according to a position of the movable body in a direction of an axis of the drive shaft. The control valve is configured to control a control pressure. The first communication passages are connected to the second communication passage by the movable body and disconnected from the second communication passage by the drive shaft.

A swash plate includes 34.5 to 43.0 wt % of copper (Cu) and 0.5 to 2.8 wt % of silicon (Si), with a remainder of aluminum (Al) and other inevitable impurities.

There is provided a shoe for a compressor with improved seizure resistance. The shoe for the compressor includes: a first sliding face that slides on a piston; a second sliding face that slides on a swash plate; and a recess formed in the second sliding face. In a section along a height direction and scaled up 1000 times in the height direction and 10 times in a radial direction, a connecting portion between the second sliding face and the recess 53 is formed in a rounded shape with a radius R2 larger than 5 mm.

Provided is a sliding member, method for manufacturing sliding member, and compressor swash plate using sliding member in which adhesion between the substrate and the resin is enhanced, and which has the excellent durability whereby peeling of the resin film from the substrate does not occur due to prolonged sliding even under harsh load conditions. The sliding member provides a substrate irradiated laser light with energy intensity per unit area of 0.053 J/mm.sup.2 or more and configured an uneven part formed toward a vertical direction by the irradiated laser light and a melted and solidified portion on the uneven part and a resin film including solid lubricant and a binder resin on the substrate.

A variable displacement swash plate type compressor includes a first and a second valve body, and a suction and a bleed window. An open degree of the suction window is minimized by the first valve body and an open degree of the bleed window is maximized by the second valve body when a suction pressure is lower than a predetermined suction pressure and a crank chamber pressure is higher than a control pressure. The open degree of the suction window is increased and the open degree of the bleed window is maximized when the suction pressure is higher than the predetermined suction pressure and the crank chamber pressure is higher than the control pressure. The open degree of the suction window and the open degree of the bleed window are decreased when the crank chamber pressure is lower than the control pressure.

Swash plate 3, which is a sliding member, includes base material 31, and coating layer 31 that is formed on base material 31 and has a thickness of 10 m or more. Coating layer 31 includes binder resin 321 and solid lubricant 322, which is dispersed in binder resin 321 and has a c-axis orientation, and a relative c-axis intensity ratio of solid lubricant 321 in coating layer 32 is 80% or more.

The invention relates to a swashplate (5) for a swashplate compressor (1) comprising a main swashplate body (8), which is made from a sintering material, and to a method for producing the swashplate (5).

An oxygen concentrator includes a wobble plate compressor having one or more double-headed pistons and cylinders. A wobble plate of the compressor does not spin as an axle rotates, but orbitally tilts relative to the axle, thereby causing the double-headed pistons to move within the respective cylinders.

A swash plate compressor 100 includes a swash plate 111 that rotates with a drive shaft 110, a pair of shoes 137a and 137b placed to sandwich a portion of the swash plate 111 close to a periphery of the swash plate 111, and a piston 136 connected to the swash plate 111 via the pair of shoes 137a and 137b. The piston 136 reciprocates in a cylinder bore 101a as the swash plate 111 rotates due to the rotation of the drive shaft 110. In the swash plate compressor 100, a zinc phosphate film is formed on each portion of the piston 136 at which the corresponding shoe 137a, 137b is in sliding contact. This reduces occurrence of galling or seizing at the sliding contact portions between the piston 136 and the shoes 137a and 137b.

A swash plate 3 includes a substrate 11 made of an iron-based material, a hard first resin layer 12 provided to coat an end surface of the substrate 11, and a soft second resin layer 13 provided to coat the first resin layer 12. A spiral annular groove 12A is formed in a surface of the first resin layer 12, and the second resin layer 13 is provided to match the sectional shape of the first resin layer 12. With the soft second resin layer 13 on a sliding surface 3A of the swash plate 3, a swash plate 3 having a good fit in an initial stage of sliding can be provided. When the second resin layer 13 partially wears, a protrusion 12 of the first resin layer 12 of the hard resin is exposed to provide good wear resistance and good sliding properties.