An excavator arm includes at least: a frame including i) a boom linkage part to swingably link excavator arm to an excavator boom about a boom axis, and ii) a tool linkage part to swingably link the excavator arm to a tool about a tool axis, the boom axis and the tool axis extending in a frame plane, an arm linear actuator extending along a longitudinal axis, the arm linear actuator having i) a proximal linkage pan linked to the frame about a proximal linkage axis and ii) a distal linkage part linked to the frame about a distal linkage axis, the proximal linkage axis and the distal linkage axis extending in an actuator plane, and an electric motor configured to drive the arm linear actuator. Electric motor is arranged between the frame plane and the actuator plane.

Segment of an articulated arm made of composite material, with an elongated shape defining a longitudinal axis, and having a box-like cross section. The segment includes a first end portion, configured for the pivoting of a further segment, a second intermediate portion configured for the pivoting of an actuation member, and a third end portion. The first, second and third portions are made in a single body. The second intermediate portion includes a protruding zone defined by a first side and by a second side converging with respect to each other to define a top. Pivoting elements are provided in the protruding zone for the pivoting of the actuation member between the protruding zone and the first end portion. The first and the second side defining the protruding zone are filleted to substantially rectilinear adjacent tracts of the first and third end portions.

Segment of an articulated arm made of composite material, with an elongated shape defining a longitudinal axis, and having a box-like cross section. The segment includes a first end portion, configured for the pivoting of a further segment, a second intermediate portion configured for the pivoting of an actuation member, and a third end portion. The first, second and third portions are made in a single body. The second intermediate portion includes a protruding zone defined by a first side and by a second side converging with respect to each other to define a top. Pivoting elements are provided in the protruding zone for the pivoting of the actuation member between the protruding zone and the first end portion. The first and the second side defining the protruding zone are filleted to substantially rectilinear adjacent tracts of the first and third end portions.

An arm for a construction machine, including an arm top formed by casting, being easily produced with high dimensional accuracy. The arm includes an arm body and an arm top. The arm top is formed of left and right arm top pieces individually formed by casting and joined together. The left and right arm top pieces include first left and right bosses constituting a first connection section, second left and right bosses constituting a second connection portion, and left and right projecting wall portions constituting a connection wall connecting the first and second connection portions to each other, respectively. The left and right arm top pieces are joined together by welding at respective opposing surfaces of the first left and right bosses, those of the second left and right bosses and those of the left and right projecting wall portions, thereby forming the arm top.

An arm for a construction machine, including an arm top formed by casting, being easily produced with high dimensional accuracy. The arm includes an arm body and an arm top. The arm top is formed of left and right arm top pieces individually formed by casting and joined together. The left and right arm top pieces include first left and right bosses constituting a first connection section, second left and right bosses constituting a second connection portion, and left and right projecting wall portions constituting a connection wall connecting the first and second connection portions to each other, respectively. The left and right arm top pieces are joined together by welding at respective opposing surfaces of the first left and right bosses, those of the second left and right bosses and those of the left and right projecting wall portions, thereby forming the arm top.

A mining machine includes a frame, a boom, an elongated member supported by a pivot element for movement relative to the boom, and a digging attachment. The boom includes a first end coupled to the frame and a second end opposite the first end. The pivot element is positioned between the first end and the second end of the boom. The hoist rope includes a portion extending over the second end of the boom. The member includes a first end, a second end, a first portion proximate the first end of the member, and a second portion positioned between the first portion and the second end of the member. At least a portion of the second portion is oriented at an angle relative to the first portion. The digging attachment is coupled to the second end of the member and is supported by the hoist rope.

A mining machine includes a frame, a boom, an elongated member supported by a pivot element for movement relative to the boom, and a digging attachment. The boom includes a first end coupled to the frame and a second end opposite the first end. The pivot element is positioned between the first end and the second end of the boom. The hoist rope includes a portion extending over the second end of the boom. The member includes a first end, a second end, a first portion proximate the first end of the member, and a second portion positioned between the first portion and the second end of the member. At least a portion of the second portion is oriented at an angle relative to the first portion. The digging attachment is coupled to the second end of the member and is supported by the hoist rope.

A work machine includes a lower-part traveling body, an upper-part turning body, an arm, a boom, a cab, an engine, a fuel tank, and a counterweight. The upper-part turning body is turnably disposed on the lower-part traveling body. The boom has a first end connected to the upper-part turning body and a second end connected to the arm. The cab is mounted on a front left of a frame of the upper-part turning body. The engine is disposed behind the cab on the frame. The fuel tank is disposed behind the engine on the frame. The counterweight is disposed behind the fuel tank on the frame. The fuel tank is disposed in a hollow formed in the counterweight.

A work machine includes a lower-part traveling body, an upper-part turning body, an arm, a boom, a cab, an engine, a fuel tank, and a counterweight. The upper-part turning body is turnably disposed on the lower-part traveling body. The boom has a first end connected to the upper-part turning body and a second end connected to the arm. The cab is mounted on a front left of a frame of the upper-part turning body. The engine is disposed behind the cab on the frame. The fuel tank is disposed behind the engine on the frame. The counterweight is disposed behind the fuel tank on the frame. The fuel tank is disposed in a hollow formed in the counterweight.

An undercarriage frame is supported by driven tracks. An upper frame is pivotally connected to the carriage frame for pivotal movement about a vertical axis. Left and right booms are attached to the carriage frame for pivotal movement about a horizontal axis. The operator's enclosure is mounted on the carriage frame between rear boom portions. Front portions of the booms are offset toward each other to enter a trench. A forked stick includes a tube coaxial with a stick pivot axis. A stick tine is attached to each end of the tube. A stick portion fixed to the tube between the tines extends away from the tines. Left and right trunnions with center passages are journaled in boom bores and received in the tube. A stick shaft passes through the central passages and fix the trunnions to the tube. Stick and boom cylinders pivot the booms and the stick.