Construction Machine

A construction machine in which a pair of boss parts coupled via a boss pipe are fixed to an end portion of a first structural body, a coupling pin is rotatably supported in bushes provided in the respective boss parts, and a pair of brackets of a second structural body are coupled to opposite ends of the coupling pin protruding from outer surfaces of the respective boss parts, respectively, the construction machine comprising:

• an inner pipe fitted onto the coupling pin on an inner circumferential side of the boss pipe, having opposite ends facing inner ends of the respective bushes, respectively, and defining, between the inner pipe and an outer circumferential surface of the coupling pin, a grease passage having an annular cross section and extending in an axial direction,
• a pair of side plates each forming an annular shape to close a gap formed between an end portion of the inner pipe and an end portion of the boss pipe, and defining, between each side plate and an inner surface of each boss part, each of grease chambers communicating with each other via the grease passage, and
• a grease supply pipe disposed between both the side plates, and having a base end welded to an outer circumferential surface of the inner pipe, an interior communicating with the grease passage, and a tip end exposed to an exterior via a hole extending through the boss pipe.