Abstract: A bucket information acquisition device for acquiring information regarding the shape of a bucket that rotates about a rotational center axis along a predetermined moving plane in a construction machine includes: a distance distribution acquisition unit that acquires the three-dimensional distance distribution of the bucket with respect to a reference point; a reference cross section extraction unit that extracts, from the distance distribution acquired by the distance distribution acquisition unit, a reference cross section which is a cross section of the bucket obtained by cutting the bucket along a plane parallel to the moving plane; an approximate line identification unit that identifies, based on the reference cross section, an approximate line approximating the reference cross section composed of a straight line and a curve; and a bucket shape calculation unit that calculates bucket shape information regarding the shape of the bucket based on the approximate line.

Abstract: A construction machine is capable of preventing degradation in efficiency of excavation work while preventing an increase in excavation resistance in the excavation work. A controller of a construction machine determines an accommodation state of earth and sand accommodated in a bucket, and outputs a resistance reduction command signal that is a command signal for operating a work device such that the bucket is displaced in a resistance reduction direction that is a direction where excavation resistance acting on the bucket is capable of being reduced, in accordance with a result of determining the accommodation state.

Abstract: A coupling portion of a lower travelling body of a mobile crane is arranged such that, in plan view, a right front straight line, which passes through any point included in a front load receiving surface and through any point included in a right front load transmission surface, passes through a right front end roller or a point on the front side relative to the right front end roller and that a left front straight line, which passes through any point included in the front load receiving surface and through any point included in a left front load transmission surface, passes through a left front end roller or a point on the front side relative to the left front end roller.

Abstract: In a lower travelling body of a mobile crane, each of a right front coupling member and a right rear coupling member is arranged to change a relative position to one or both of a right crawler frame and a car body in order to reduce dimensions of the lower travelling body when it is transported. Each of a left front coupling member and a left rear coupling member is arranged to change a relative position to one or both of a left crawler frame and the car body in order to reduce dimensions of the lower travelling body when it is transported.

Abstract: Provided are a soil quality information acquisition system that enables acquisition of soil quality information at an appropriate time on a worksite, and a working machine including the system. The soil quality information acquisition system includes a body position detection part, an acquisition time determination part, a soil quality information acquisition part, and a storage part. The body position detection part acquires position information about a hydraulic excavator on the worksite. The acquisition time determination part determines an acquisition time on the basis of soil quality relevant information being information related a change in a quality on the worksite. The soil quality information acquisition part receives an acquisition signal output from the acquisition time determination part, and acquires the soil quality information in response to the acquisition signal. The storage part stores the position information and the soil quality information in association with each other.

Abstract: A hydraulic excavator includes a work attachment a drive unit, a load cell, a machine load calculator, a soil pressure load calculator, and a soil quality estimator. The machine load calculator calculates, from orientation information of the work attachment and information about a load that the drive unit receives, a machine load, which is a load that a bucket receives from earth and sand. The soil pressure load calculator calculates, from a shape of a soil mass, the orientation information, the shape of the bucket, the density of the soil, a wall surface frictional angle, a soil pressure load.

Abstract: In a work machine suspension device, each of a plurality of retention devices includes a support member that is supported by a first leg portion main body so as to be movable between an entry allowed position and a retention position. The entry allowed position is a position where the support member retracts from a second leg portion main body to allow a retained portion to enter between the first leg portion main body and the second leg portion main body, and the retention position is a position where the retained portion is retained on the support member while the support member is supported by the first leg portion main body and the second leg portion main body.

Abstract: Provided is a holding apparatus capable of holding a holding object with sufficient holding force from either of the outside and the inside. The holding apparatus includes a holding-apparatus body, a first and second arms, an opening and closing mechanism, a driving device, and a first and second holding elements. The opening and closing mechanism interconnects each of the first and second arms and the holding apparatus main bodies so as to allow the first and second arms to be moved in the opening and closing direction while kept in the holding posture. The first and second holding elements is pivotably connected to the arm lower region, having respective inner contact surfaces opposed to each other in the opening and closing direction and respective outer contact surfaces facing the opposite side.

Abstract: The present invention aims to reduce the costs of construction machine by providing a side frame that can be shared by a plurality of construction machines of different models. A left side frame has: a cab support portion for supporting a cab; a cooler support portion provided behind the cab support portion to support a cooler; and a tank support portion provided between the cab support portion and the cooler support portion to support a tank. The tank support portion is configured to allow one of a first tank and a second tank that is different from the first tank in size in the right-and-left direction to be selectively attached to the tank support portion.

Abstract: The present invention aims to reduce the costs of construction machine by providing a side frame that can be shared by a plurality of construction machines of different models. A left side frame has: a cab support portion for supporting a cab; a cooler support portion provided behind the cab support portion to support a cooler; and a tank support portion provided between the cab support portion and the cooler support portion to support a tank. The tank support portion is configured to allow one of a first tank and a second tank that is different from the first tank in size in the right-and-left direction to be selectively attached to the tank support portion.

Abstract: A set of members forming an upper frame of a construction machine includes a center section, a left side deck, and a right side deck. The left side deck has a left deck beam. The right side deck has a right deck beam. At least one of the left deck beam or the right deck beam is adjustment deck beams. The adjustment deck beam has a contacting part that is adapted to be brought into contact with and is also adapted to be welded to an external side surface of an adjustment-side longitudinal plate, a first opposing part that is adapted to be opposed to a side surface of the bottom plate and is also adapted to be welded to the side surface, and a second opposing part that is adapted to be opposed to an upper surface of the bottom plate with a height-adjustment gap therebetween.