Variable capacity rotary compressor

A variable capacity rotary compressor, comprising:

• upper and lower compression chambers having different interior capacities thereof;
• a rotating shaft passing through the upper and lower compression chambers;
• upper and lower eccentric cams mounted to the rotating shaft to be placed in the upper and lower compression chambers, respectively, the upper and lower eccentric cams being eccentric from the rotating shaft in a common direction;
• upper and lower eccentric bushes fitted over the upper and lower eccentric cams, respectively, to be eccentric from the rotating shaft in opposite directions;
• a slot provided around a connecting part which connects the upper and lower eccentric bushes to each other;
• a locking pin projecting from the rotating shaft between the upper and lower eccentric cams and to engage with the slot, the locking pin operating to change a position of the upper eccentric bush or the lower eccentric bush to a maximum eccentric position according to a rotating direction of the rotating shaft;
• and
• a surface-treated part provided around each of first and second ends of the slot to increase a hardness thereof to prevent the first and second ends of the slot from being deformed or worn out when the locking pin collides with the first and second ends of the slot.

A variable capacity rotary compressor having upper and lower compression chambers, comprising:

• upper and lower eccentric cams rotatably provided in the upper and lower compression chambers, respectively;
• upper and lower eccentric bushes fitted over the upper and lower eccentric cams, respectively;
• a slot formed between the upper and lower eccentric bushes, and having first and second ends;
• a locking pin movable within the slot to configure the upper and lower eccentric bushes to provide a compression operation in one of the upper and lower compression chambers and to provide an idle operation in a remaining one of the upper and lower compression chambers;
• and
• a surface-treated part provided around each of the first and second ends of the slot to increase a hardness thereof to prevent the first and second ends of the slot from being deformed or worn out when the locking pin collides with the first and second ends of the slot.

A variable capacity rotary compressor having upper and lower compression chambers, comprising:

• a slot having first and second ends;
• a locking pin movable between the first and second ends, and
• upper and lower eccentric bushes provided in the upper and lower compression chambers, respectively, and changeably configurable such that a compression operation is provided in one of the upper and lower compression chambers and an idle operation is provided in a remaining one of the upper and lower compression chambers according to a position of the locking pin;
• and
• a surface-treated part provided around each of the first and second ends of the slot to prevent the first and second ends of the slot from being deformed or worn out when the locking pin collides with the first and second ends of the slot.