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A swash-plate type compressor wherein a plurality of pistons fitted into a plurality of cylinder bores having their center on a circle are reciprocated by a swash-plate secured to a rotary shaft at a tilt angle. A swash-plate chamber rotatably accommodating the swash-plate concurrently functions as

A swash-plate type compressor wherein a plurality of pistons fitted into a plurality of cylinder bores having their center on a circle are reciprocated by a swash-plate secured to a rotary shaft at a tilt angle. A swash-plate chamber rotatably accommodating the swash-plate concurrently functions as a passage for the refrigerant gas sucked, and an annular refrigerant gas passage, whose external diameter is larger than that of a circumcircle of the aforementioned cylinder bores and whose inner side is open to the swash-plate chamber, is formed on the external side of the swash-plate chamber. This annular passage for the refrigerant gas sucked functions as a by-pass therefor, diminishes the flow resistance of the refrigerant gas, and facilitates the cooling of the pistons with a result of reducing the operation noise produced from the engaging portion of the pistons and the swash-plate.

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1. A swash-plate type compressor comprising: a rotary shaft; a swash-plate secured to said rotary shaft; a cylinder block rotatably supporting said rotary shaft, and consisting of two halves each having a plurality of circumferentially spaced cylinder bores which extend axially of said rotary s

1. A swash-plate type compressor comprising: a rotary shaft; a swash-plate secured to said rotary shaft; a cylinder block rotatably supporting said rotary shaft, and consisting of two halves each having a plurality of circumferentially spaced cylinder bores which extend axially of said rotary shaft and have the centers on a circle whose center is located on the axis of said rotary shaft, said two halves being assembled in abutment with each other such that said cylinder bores in said respective two halves are in alignment with each other, said cylinder block having a swash-plate chamber rotatably accommodating said swash-plate and constituting a passage for sucked refrigerant gas; and a plurality of pistons slidably received in said cylinder bores and each having an engaging recess engaging said swash-plate, said cylinder block further having an inlet passage through which a stream of refrigerant gas is sucked therein, a continuously annular passage communicated with said inlet passage, concentric with said circle and open to said swash-plate chamber, said annular passage being formed circumferentially in a radially inward portion of the cylindrical wall of said cylinder block, having a diameter larger than that of a common circumcircle of said cylinder bores, and functioning as a by-pass for said sucked refrigerant gas flowing through said swash-plate chamber, and a plurality of circumferentially spaced, axially extending, holes communicated with said swash-plate chamber, said annular passage and said cylinder bores, and accommodating fixing bolts for clamping said two halves, said holes having a diameter larger than that of said fixing bolts so that an annular space formed between the inner surface of said holes and the outer surface of said bolts serves as a communicating passage to said cylinder bores, said diameter of said holes increasing with an angular distance of said holes as measured from a junction of said inlet passage and said annular passage, whereby the sucked refrigerant gas is evenly delivered to said plurality of pistons and a portion of each of said pistons adjacent to said engaging recess is cooled evenly on both radially inward and outward sides thereof. 2. A compressor as claimed in claim 1, wherein said inlet passage is open to said annular passage at a position between two neighboring pistons of said plurality of pistons, and tilted to a normal line of said circumcircle. 3. A compressor as claimed in claim 1, wherein said engaging recess of said pistons engages said swash-plate by way of a pair of shoes which slide on opposite surfaces of said swash-plate and a pair of balls which are sandwiched by said shoes and said piston. 4. A compressor as claimed in claim 1, wherein the external diameter of said annular passage is larger by not less than 4 mm than the diameter of said circumcircle. 5. A compressor as claimed in claim 1, wherein the external diameter of said annular passge is larger by not less than 6 mm than the diameter of said circumcircle. 6. A compressor as claimed in claim 1, wherein said annular passage is an extension of said swash-plate chamber radially outwardly of said circumcircle. 7. A compressor as claimed in claim 1, wherein said annular passage and said swash-plate chamber are constituted by a combination of two counter bores formed circumferentially in abutting end portions of said respective two halves such that the diameter thereof is larger than that of said circumcircle. 8. A compressor as claimed in claim 5, wherein each of said pistons comprises two heads and a connecting portion connecting said two heads, said two heads and said connecting portion defining said engaging recess, and said connecting portion axially extends across a space consisting of said annular passage and said swash-plate chamber.