US 11,987,952 B2
Construction machine
Yutaka Yasuda, Tsuchiura (JP); Daisuke Kumata, Tsuchiura (JP); and Ryouta Aikawa, Tsuchiura (JP)
Assigned to Hitachi Construction Machinery Co., Ltd, Tokyo (JP)
Appl. No. 17/420,835
Filed by Hitachi Construction Machinery Co., Ltd., Tokyo (JP)
PCT Filed Feb. 17, 2020, PCT No. PCT/JP2020/005961
§ 371(c)(1), (2) Date Jul. 6, 2021,
PCT Pub. No. WO2020/189126, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 2019-053204 (JP), filed on Mar. 20, 2019.
Prior Publication US 2022/0090355 A1, Mar. 24, 2022
Int. Cl. F16C 11/04 (2006.01); E02F 9/00 (2006.01); F16C 33/10 (2006.01)
CPC E02F 9/006 (2013.01) [F16C 11/045 (2013.01); F16C 33/10 (2013.01); F16C 2350/26 (2013.01); Y10T 403/32861 (2015.01)] 3 Claims
OG exemplary drawing
 
1. A construction machine in which a pair of boss parts coupled via a boss pipe axially extending therebetween are fixed to an end portion of a first structural body, a coupling pin coaxially extends through the boss pipe and is rotatably supported in bushes provided in aligned apertures 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 coaxially fitted onto the coupling pin on an inner circumferential side of the boss pipe, having opposite axial 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 face inner surfaces of the respective boss parts, respective outer circumferences of the respective side plates being welded to an inner circumferential surface of the boss pipe and respective inner circumferences of the respective side plates being welded to an outer circumferential surface of the inner pipe to close a gap formed between a respective axial end portion of the inner pipe and a respective axial end portion of the boss pipe, and defining, between each side plate and an inner surface of each respective boss part, one of a pair 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.