Hitachi Construction Machinery Co., Ltd.

Masakazu Kaitou

Isamu Aoki

Masaki Yoshikawa

Takayoshi Murahashi

Koji Shimazaki

Tomohiro Ueda

Takashi Ishii

In an unloaded state of the bucket (), a control device () calculates an unloaded moment (M) around a hinge pin G from the pressure of the lift arm cylinder that is detected by pressure sensors (), the angle of a lift arm that is detected by a lift arm angle sensor, and dimension data extracted from a vehicle body information database (). In a loaded state of the bucket, the control device calculates a loaded moment (M) around the hinge pin G from the pressure of the lift arm cylinder, the angle of the lift arm, and the dimension data extracted from the vehicle body information database. The control device calculates the load (W) on the bucket by dividing the difference between the unloaded moment and the loaded moment by the horizontal distance (L) between the hinge pin and the gravity center position of the bucket.

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Tsuchiura, Japan

Masakazu Kaitou