公开(公告)号：EP4155464A1

公开(公告)日：2023-03-29

申请号：EP21809614.7

申请日：2021-05-18

申请人： Hitachi Construction Machinery Co., Ltd.

发明人： KUMATA, Daisuke

IPC分类号： E02F3/38 ,  E02F3/40 ,  E04G23/08

摘要： Provided is a work machine capable of rotating an attachment while appropriately supporting a load applied to the attachment. A work machine comprising: a hydraulic cylinder attached to a body side surface of an arm and extending and contracting; a first link rod extending along a back side surface of the arm; and a second link rod rotatably supported on a side surface of the arm via a first pin extending in the width direction of a front working device, the second link rod having one end which projects toward the back side surface of the arm and the other end which projects toward the body side surface of the arm, one end of the first link rod being rotatably connected to the attachment, the one end of the second link rod being rotatably connected to the other end of the first link rod via a second pin extending in the width direction of the front working device, and the other end of the second link rod being rotatably connected to a distal end of a cylinder rod of the hydraulic cylinder via a third pin extending in the width direction of the front working device.

公开(公告)号：EP3892780A1

公开(公告)日：2021-10-13

申请号：EP20773042.5

申请日：2020-02-17

申请人： Hitachi Construction Machinery Co., Ltd.

发明人： YASUDA, Yutaka ,  KUMATA, Daisuke ,  AIKAWA, Ryouta

IPC分类号： E02F3/40 ,  E02F9/00 ,  F16C33/10 ,  F16N21/00

摘要： Provided is a construction machine in which a pair of boss parts (17L, 17R) coupled via a boss pipe (18) are welded to a tip end of an arm (7), a coupling pin (16) is rotatably supported in bushes (20L, 20R) of the respective boss parts (17L, 17R), and brackets (8b) of a bucket (8) are coupled to opposite ends of the coupling pin (16). An inner pipe (25) is fitted onto the coupling pin (16) on an inner circumferential side of the boss pipe (18), and defines a grease passage (26) between the coupling pin (16) and the inner pipe (25). Left and right gaps between the boss pipe (18) and the inner pipe (25) are closed with side plates (27L, 27R), and a pair of grease chambers (28L, 28R) communicating with each other via the grease passage (26) are defined. A grease supply pipe (29, 30) has a base end welded to a center of an outer circumferential surface of the inner pipe (25) in an axis (C) direction, and a tip end opened in a left side plate (7L) of the arm (7), so that a nipple (33) is mounted to the tip end.