Double-headed piston type swash plate compressor

A double-headed piston type swash plate compressor comprising:

• a rotation shaft extending in an axial direction and a radial direction;
• a housing that accommodates the rotation shaft;
• a swash plate that rotates when the rotation shaft rotates;
• two cylinder bores opposed to each other in the axial direction of the rotation shaft and located in the housing at an outer side of the rotation shaft in the radial direction;
• a double-headed piston that reciprocates in the two cylinder bores;
• and
• two shoes that couple the double-headed piston to the swash plate, wherein
• the two cylinder bores and the double-headed piston define two compression chambers,
• rotation of the swash plate reciprocates the double-headed piston in the two cylinder bores and compresses fluid in each of the compression chambers,
• the double-headed piston includes:
• two shoe holders that hold the two shoes, wherein the two shoe holders are opposed to each other in an axial direction of the double-headed piston;
• a neck that couples the two shoe holders, wherein the neck is located at an outer circumferential side of the swash plate;
• two heads respectively located at two ends of the double-headed piston in the axial direction of the double-headed piston, wherein the two heads are respectively located in the two cylinder bores with a gap formed between each of the two heads and a wall surface of the corresponding one of the two cylinder bores;
• and
• two coupling portions that couple the two shoe holders and the two heads, respectively,
• each of the coupling portions includes:
• an outer portion extending in the axial direction of the double-headed piston;
• and
• an inner portion located at an inner side of the outer portion in the radial direction, wherein the inner portion is extended in the axial direction of the double-headed piston and opposed to the outer portion in the radial direction,
• when referring to a direction orthogonal to both of an opposing direction of the inner portion and the outer portion and the axial direction of the double-headed piston as a widthwise direction,
• the neck is larger in the widthwise direction than in the opposing direction so that the neck is deformable in the opposing direction when the swash plate applies load to the double-headed piston,
• each of the two coupling portions has a width that is less than or equal to a width of the neck,
• the inner portion includes a narrow portion having a width that is less than or equal to a width of each of the shoe holders,
• the narrow portion is at least partially located closer to the head than the shoe holder in the inner portion, and
• the two coupling portions are deformable in the widthwise direction when the swash plate applies load to the double-headed piston.