Patent ID: 8152481

Claim:
A piston-type compressor that includes a crankcase defined therein by a cylinder block having a plurality of cylinders through which pistons slide therein and a housing mounted at said cylinder block with at least a first shaft end of a shaft passing through said crankcase rotatably supported at said cylinder block via a bearing assembly or by allowing the first shaft end of said shaft to directly slide against said cylinder block and a swashplate disposed in said crankcase made to rotate as said shaft rotates thereby causing the pistons to reciprocally slide through said cylinders, wherein an inbound oil guide passage is formed within said cylinder block above the shaft and includes a first end, a second end, a first end cylindrical passage portion and a second end cylindrical passage portion, wherein the first end opens at an end surface of said cylinder block facing said crackcase between two cylinders of the plurality of cylinders that are set next to each other and wherein the second end communicates with a sliding portion inside said cylinder block from above the shaft, wherein the first end of the inbound oil guide passage opens between two adjacent cylinder bores above the shaft, below an imaginary line that is connected to the centers of the two adjacent cylinder bores, and is disposed apart from respective openings of each adjacent cylinder bore and wherein the first end cylindrical passage portion and the second end cylindrical passage portion are extended in different directions and are in fluid communication with one another internally of the cylinder block with the first end cylindrical passage portion extending from the first end to be closer to a center axis of the shaft at an angle towards the shaft and with the second end cylindrical passage portion extending from the second end either radially outwardly relative to the shaft or at an angle relative to and away from the shaft.