Patent ID: 9512830
Filing Date: 2016-12-06
CPC Classification: F04B

Claim Text:
1. A reciprocating compressor comprising: an electric component; a compression component actuated by the electric component; and a container which accommodates the electric component and the compression component and stores oil; wherein the compression component includes: a cylinder; a piston which has an internal space which opens at an opposite side of a head portion thereof and is reciprocatable inside of the cylinder; an eccentric shaft rotated by the electric component around an axis parallel to an axis of the eccentric shaft; a piston pin provided in the piston so as to extend transversely in the internal space; a connecting rod one end portion of which is rotatably fitted to the eccentric shaft and the other end portion of which is inserted into the internal space of the piston, the connecting rod being rotatably fitted to the piston pin in a smaller-shaft hole formed in the other end portion; an oil feeding mechanism for feeding the oil stored in the container to a specified region of the connecting rod; a communicating passage which is provided inside of the connecting rod such that the smaller-shaft hole and the specified region are in communication with each other via the communicating passage, and feeds the oil fed to the specified region by the oil feeding mechanism to the smaller-shaft hole, when the piston is in a suction stroke; a first oil feeding passage which extends in an axial direction of the piston pin and opens in an outer peripheral surface of the piston; a communicating hole which is provided in the connecting rod such that the smaller-shaft hole and the internal space of the piston are in communication with each other via the communicating hole, and discharges the oil fed to the smaller-shaft hole to the internal space of the piston; and an oil feeding port which is provided in the piston pin such that the first oil feeding passage and the smaller-shaft hole are in communication with each other via the oil feeding port and feeds the oil fed to the smaller-shaft hole to the first oil feeding passage; wherein the oil feeding port is provided in the piston pin in a location other than a location facing a location at which the communicating passage opens in the smaller-shaft hole, wherein the specified region of the connecting rod is a larger-shaft hole which is formed at one end portion of the connecting rod and into which the eccentric shaft is fittingly inserted, the reciprocating compressor further comprising: a main shaft having one end portion to which the eccentric shaft is connected such that an axis of the main shaft and the axis of the eccentric shaft are eccentric with respect to each other, the other end portion of the main shaft being immersed in the oil stored in the container, and the main shaft being rotated by the electric component around the axis of the main shaft; wherein a second oil feeding passage is provided from the other end portion of the main shaft to an outer peripheral surface of a fitting insertion portion of the eccentric shaft which is fittingly inserted into the larger-shaft hole of the connecting rod, and feeds the oil stored in the container to the outer peripheral surface of the fitting insertion portion of the eccentric shaft, wherein an oil feeding groove provided in the outer peripheral surface of the fitting insertion portion of the eccentric shaft or an inner peripheral surface of the larger-shaft hole of the connecting rod such that the second oil feeding passage and the communicating passage are in communication with each other via the oil feeding groove, wherein the second oil feeding passage is provided in the eccentric shaft, wherein a cross-section of the oil feeding groove which is perpendicular to the axis of the eccentric shaft is arc-shaped, and wherein when the piston is in a suction stroke, the oil feeding groove causes the second oil feeding passage and the communicating passage to be substantially in communication with each other, when the piston is in a compression stroke, the oil feeding groove causes the second oil feeding passage and the communicating passage substantially not to be in communication with each other, the reciprocating compressor further comprising: a discharge hole provided in the connecting rod such that the communicating passage and inside of the container are in communication with each other via the discharge hole.