Kobelco Construction Machinery Patente

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There is provided a motor controller capable of suppressing the rotation of a motor at the time of discharging an electric accumulator, and a construction machine provided with the motor controller. A motor controller (10) is provided with a current controller (1) for controlling an electric current supplied from an electric accumulator (E) to a motor (M), and a rotation detector (2) for detecting the rotation of the motor (M). The current controller (1) supplies only a d-axis current to the motor (M) according to a discharge command. If the rotation of the motor (M) is detected by the rotation detector (2) at the time of discharging the electric accumulator (E), the current controller (1) controls the d-axis current so as to suppress the rotation of the motor (M).

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Provided is a construction machine. The construction machine is provided with a lower propelling body and an upper slewing body. The upper slewing body has an upper frame, a cab disposed on a left portion or a right portion of the upper frame, and cab mounts. The cab mounts are disposed at lateral ends on each of front and rear portions of the cab respectively, including, on at least one of the front and rear portions, first and second outer-side cab mounts disposed at the outer side of lateral ends of the cab. The first and second outer-side cab mounts are juxtaposed with a small enough distance to receive a rollover load concurrently when the construction machine rolls over toward a side of the cab.

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Provided is a hydraulic drive system capable of causing a specific action of a main actuator and an action of an optional actuator simultaneously and properly. The system includes: first and second pumps (11, 12); a first main supply fluid line and an optional supply fluid line leading to the first pump (11); a second main supply fluid line leading to the second pump (12); a main manipulating device (31) for the main actuator (7); an optional manipulating device (32) for the optional actuator (8); a bleed-off flow rate regulating section (42) to change the bleed-off flow rate for the second pump (12); and a bleed-off control section to operate the bleed-off flow rate regulating section (42) to change the discharge flow rate of the second pump (12) in accordance with a control operation applied to the main manipulating device (31) and to make a bleed-off flow rate in a specific combined manipulation state where a specific main control operation and an optional control operation are simultaneously performed be smaller than that in a single main manipulation state.

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An object of the present invention is to enable routing of pilot pipes while suppressing entanglement with a hydraulic pipe and reducing space necessary for routing of the pilot pipes. A solenoid valve 35 is supported by a supporting bracket 50 at a position above a control valve 30. An erected section 51 of the supporting bracket 50 is arranged at a position separated from the control valve 30 in a horizontal direction so as not to overlap with a hydraulic port 32 in the control valve 30 in a side view. A plurality of pilot pipes 36 connected to the solenoid valve 35 are held by a guide section 53 in a bundled state so that the pilot pipes 36 are routed in a vertical direction along the erected section 51.

Disclosed is a construction machine which is capable of efficiently disposing an exhaust aftertreatment device over an upper frame, while ensuring a space for maintenance of an engine. A rear wall portion 27 is provided at a rear portion of an upper frame 11 to cover a space over the upper frame 11 from therebehind, wherein the rear wall portion 27 has a curved portion 27a curved in an approximately arc shape in top plan view to serve as a right or left end thereof. An engine 12 is provided on the upper frame 11 at a position in front of the rear wall portion 27 in such a manner that an interspace G is formed between the engine 12 and the curved portion 27a. An exhaust aftertreatment device 16 is provided in front of the rear wall portion 27 while being superposed over the interspace G, wherein the exhaust aftertreatment device 16 comprises a first treatment section 23 capable of removing a first component contained in exhaust gas of the engine, and a second treatment section 24 capable of removing a second component contained in the exhaust gas. The first treatment section 23 and the second treatment section 24 are supported over the upper frame 11 in a posture where respective longitudinal directions J2, J3 of the first and second treatment sections 23, 24 are oriented parallel to each other in top plan view and along the curved portion 27a in top plan view.

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Provided is an upper slewing body which enables a working space for installing and removing a boom foot pin without removal of a housing box to be secured. A boom foot pin 25 is attached to a pair of vertical plates 22 so as to be able to be pulled out along an axial direction D1 of the boom foot pin 25. A housing box 30 has a box main body 31 with a housing space S inside and an opening/closing lid configured to allow an opening region 31a of the box main body 31 to be opened and closed. The box main body 31 is disposed on the right of the right vertical plate 22 in a state where the boom foot pin 25 is placed opposite the housing space S with reference to the opening region 31a in a side view in which the upper slewing body 12 is viewed along an axial direction D1 and the box main body 31 is shaped to open the boom foot pin 25 in the axial direction D1. The opening/closing lid 35 is rotated to a position where the opening region 31a is closed to lie at a position where the opening/closing lid 35 overlaps the boom foot pin 25 in the side view, and is rotated to a position where the opening region 31a is opened to lie at a position where the boom foot pin 25 is opened in the axial direction D1.

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To arrange a terminal box while suppressing a decline in degree of freedom of layout of devices. An upper slewing body 3 includes: a bottom plate 21 rotatably attached to a lower traveling body 2; supporting frames 22A and 22B standing on the bottom plate 21; an engine 14 supported on the bottom plate 21 by the supporting frames 22A and 22B; a generator motor 15 connected to the engine 14; and a terminal box 18 including a terminal T, which is electrically connected to the generator motor 15 and allows a cable C2 to be connected, and a box main body housing the terminal T and being attached to the generator motor 15. The generator motor 15 includes a facing section 15a facing the bottom plate 21 at a position separated from the supporting frames 22A and 22B in a plan view. The terminal box 18 is arranged between the facing section 15a of the generator motor 15 and the bottom plate 21.

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Provided is an electric motor capable of stabilizing a preload applied to a bearing by an annular spring and effectively retarding degradation of the annular spring. The electric motor includes a motor shaft (11), a rotor (12), a stator (13), a housing (14) containing the rotor (12) and the stator (13) in a posture where the motor shaft (11) extends vertically, an upper bearing (17) and a lower bearing (18) supporting the motor shaft (11), and an annular spring (21) applying a downward preload to the upper bearing (17). The lower bearing (18) is fixed to the motor shaft (11) and the housing (14). The housing (14) has a load-receiving surface (22) receiving an upward thrust load overcoming the preload from the upper bearing (17).

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