Swash plate compressor
View Patent ↗A swash plate compressor 100 includes a swash plate 111 that rotates with a drive shaft 110 , a pair of shoes 137 a and 137 b 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 137 a and 137 b . The piston 136 reciprocates in a cylinder bore 101 a 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 137 a, 137 b is in sliding contact. This reduces occurrence of galling or seizing at the sliding contact portions between the piston 136 and the shoes 137 a and 137 b.
1. A swash plate compressor comprising:
a swash plate that rotates with a drive shaft;
a pair of shoes placed to sandwich a portion of the swash plate close to a periphery of the swash plate; and
a piston connected to the swash plate via the pair of shoes, the piston being caused to reciprocate by rotation of the swash plate,
wherein a zinc phosphate film is formed on surfaces of each sliding part of the piston at which each of the pair of shoes is in sliding contact.
2. The swash plate compressor according to claim 1 ,
wherein the piston includes: a piston main body; and an extending part extending from the piston main body and including an accommodating part capable of accommodating the pair of shoes,
wherein each of the pair of shoes includes: a spherical part in sliding contact with a concave spherical sliding part formed in the accommodating part; and a flat part in sliding contact with a flat sliding part of the swash plate,
wherein the pair of shoes is a first shoe placed in the accommodating part on a piston main body side of the swash plate, and a second shoe placed in the accommodating part on an opposite side of the swash plate opposite to the piston main body,
wherein the concave spherical sliding parts are a first sliding part in sliding contact with the spherical part of the first shoe, and a second sliding part in sliding contact with the spherical part of the second shoe, and
wherein a surface roughness of the zinc phosphate film formed on the first sliding part is less than a surface roughness of the zinc phosphate film formed on the second sliding part.
3. The swash plate compressor according to claim 2 , wherein a surface of the zinc phosphate film formed on the first sliding part is smoothened in advance by the sliding contact with the spherical part of the first shoe before shipment from a factory.
4. The swash plate compressor according to claim 3 , wherein the zinc phosphate film has a thickness of 1 to 6 μm and a surface roughness Ra of 0.8 or less.
5. The swash plate compressor according to claim 2 , wherein the zinc phosphate film has a thickness of 1 to 6 μm and a surface roughness Ra of 0.8 or less.
6. The swash plate compressor according to claim 1 , wherein the zinc phosphate film has a thickness of 1 to 6 μm and a surface roughness Ra of 0.8 or less.