Kobelco Construction Machinery Co., Ltd.

Nobuhiro Koga

Natsuki Yumoto

Hideki Yoshihara

Takanobu Nakamura

Yoshifumi Asai

Yoshinobu Hosaka

Yoshitsugu Tamura

Nobuya Sakaguchi

Kazuki Tamiya

Provided is a working machine including first and second members, an angle detection device and a connection pin connected to the first and second members to rotate integrally with the second member relative to the first member. The angle detection device has a marker, an angle sensor and a guard member, which has a main guard portion covering the angle sensor and including an inner opposite surface opposed to an end surface of the projecting end portion and a guard-member-side engagement portion. One of the angle sensor and the marker is disposed on the inner opposite surface, the other disposed on the end surface. The first member has a first-member-side engagement portion engaging with the guard-member-side engagement portion to restrain the main guard portion from relative rotation. The guard member can contact with the connection pin to restrain the guard member from relative displacement to the projecting end portion.

Working machine with angle detection device

Simplification of a device configuration and control is realized, which enables attraction and release by a magnet without using a battery. A magnet work machine includes a generator motor () driven by an engine (); and an inverter () which controls a magnet () and the generator motor () such that the magnet () is energized by electric power from the generator motor () to attract metal scraps or the like, and during demagnetization for releasing metal scraps or the like, electric power applied to the magnet () is transmitted to the generator motor () as regenerative power so as to be consumed. The inverter () determines a torque of the generator motor () as a motor according to a voltage change of a main circuit based on a detected main circuit voltage so as to suppress the voltage change, and gives the torque as a command.

Magnet work machine

A pump control device for a construction machine includes a pump regulator, a pump pressure detector, a travelling operation detector, a working operation detector, and a controller instructing the pump flow rate depending on the pump pressure to the pump regulator. The controller stores first and second P-Q characteristics as a horsepower characteristic and instructs the pump flow rate to the pump regulator, based on the first P-Q characteristic when a travelling operation is detected, and based on the second P-Q characteristic when a working operation is detected. The second P-Q characteristic is equal to the first P-Q characteristic in a low-pressure region while is one giving a low characteristic relatively to the first P-Q characteristic so as to increase a horsepower difference as the pump pressure increases, in intermediate-pressure and high-pressure regions.

Hydraulic pump control device for construction machine

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Hiroshima, Japan

Nobuhiro Koga