Double-headed swash type compressor and method for manufacturing cylinder block

A double-headed swash type compressor comprising:

• a cylinder block including an annular array of piston bores formed therethrough, a plurality of pistons reciprocatingly received in the piston bores, a suction space formed therein, and a shaft bore formed therethrough, the shaft bore having a plurality of refrigerant supply holes formed therein, the plurality of refrigerant supply holes communicating with a plurality of compression chambers defined by the piston bores and the plurality of pistons;
• a first housing coupled to a first side of the cylinder block;
• a second housing coupled to a second side of the cylinder block;
• a shaft received in the shaft bore, the shaft including a passage formed therein configured to receive a refrigerant, a refrigerant introduction hole in fluid communication with the suction space and configured to introduce the refrigerant into the passage, and a refrigerant discharge hole configured to discharge the refrigerant from the passage;
• a swash plate coupled to the shaft in an oblique position with respect to the shaft, the swash plate operatively coupled to the plurality of pistons;
• and
• a journal bearing disposed between an inner surface of the shaft bore and outer surface of the shaft, the journal bearing formed from a porous material.

A double-headed swash type compressor comprising:

• a cylinder block including an annular array of piston bores formed therethrough, a plurality of pistons reciprocatingly received in the piston bores, a suction space formed therein, and a shaft bore formed therethrough, the shaft bore having a plurality of refrigerant supply holes formed therein, the plurality of refrigerant supply holes communicating with a plurality of compression chambers defined by the piston bores and the plurality of pistons;
• a first housing coupled to a first side of the cylinder block, the first housing having a first discharge chamber formed therein;
• a second housing coupled to a second side of the cylinder block, the second housing having a second discharge chamber formed therein, the suction space formed between the first discharge chamber and the second discharge chamber;
• a shaft received in the shaft bore, the shaft including a passage in fluid communication with the suction space;
• a swash plate coupled to the shaft in an oblique position with respect to the shaft, the swash plate operatively coupled to the plurality of pistons;
• and
• a journal bearing disposed between an inner surface of the shaft bore and outer surface of the shaft, the journal bearing formed from a sintered material, wherein a space portion is defined between the outer surface of the shaft and the inner surface of the shaft bore, the space portion in fluid communication with the suction space.

A method for manufacturing a cylinder block, comprising:

• preparing a cylinder block, the cylinder block including an annular array of piston bores formed therethrough, a plurality of pistons reciprocatingly received in the piston bores, and a shaft bore formed therethrough;
• forming a journal bearing from a sintered material;
• inserting the journal bearing into each of a first end of the shaft bore and a second end of the shaft bore;
• and
• forming through-holes through the journal bearing, the through-holes in fluid communication with the piston bores when the journal bearing is inserted in each of the first end of the shaft bore and the second end of the shaft bore.