Patent ID: 8272847
Filing Date: 2012-09-25
Classification: F04B

Abstract:
1. A reciprocating compressor comprising: a crankshaft bidirectionally rotating and having an eccentric unit disposed to be eccentric from a center of the rotation; an eccentric sleeve eccentrically inserted onto the eccentric unit of the crankshaft; a connecting rod having one end inserted onto the eccentric sleeve and another end coupled to a piston slidably inserted into a cylinder; a first latching unit installed between the eccentric unit of the crankshaft and the eccentric sleeve, wherein the first latching unit operates in a saving mode as the connecting rod and the eccentric sleeve are locked to each other and a first bearing surface is provided between the eccentric unit of the crankshaft and the eccentric sleeve upon forward rotation of the crankshaft; a second latching unit installed between the eccentric sleeve and the connecting rod, wherein the second latching unit operates in a power mode as the eccentric unit of the crankshaft and the eccentric sleeve are locked to each other and a second bearing surface is provided between the connecting rod and the eccentric sleeve upon reverse rotation of the crankshaft, wherein the first latching unit comprises a first latching pin coupled to the eccentric unit of the crankshaft to protrude in a radial direction and elastically supported by the eccentric unit; a first pin stopper having a hole and both ends whose inner circumferential surfaces are spaced from the center of the eccentric unit of the crankshaft with different distances, wherein one of the both ends of the first pin stopper is stopped by the first latching pin according to a rotation direction of the crankshaft so as to make the eccentric unit of the crankshaft and the eccentric sleeve locked to each other, the second latching unit comprises a second latching pin housing located outside the eccentric sleeve and coupled to the first pin stopper, a second latching pin passing through the hole of the first pin stopper and elastically supported in the second latching pin housing to protrude in an axial direction of the crankshaft; and a second pin stopper provided at the connecting rod and having an inclined surface and a stepped surface, the second pin stopper allowing the second latching pin to be stopped thereat or released therefrom in a sliding manner in a circumferential direction according to the rotation direction of the crankshaft.