Sumitomo Heavy Industries, Ltd.

Koichiro Tsukane

Yusuke Sano

Keiji Honda

Yoshiyasu Itsuji

Chunnan Wu

Takumi Itoh

Eisuke Matsuzaki

Hiroshi Ishiyama

Kazunori Hiranuma

Junichi Okada

Kazushi Ishida

A shovel includes a lower traveling body, an upper turning body turnably mounted on the lower traveling body, and a controller configured to control a projection device that projects light onto a ground surface. The controller is attached to the upper turning body, and is configured to control the projection device so as to enable visualization of the relationship between the current shape of the ground surface and the shape of a target surface.

Shovel and work support system for construction machine

A shovel that corrects the movement of an attachment regardless of the operating state of the attachment by an operator is provided. The shovel includes a traveling body, a turning body turnably mounted on the traveling body, an attachment attached to the turning body, a hydraulic actuator configured to drive the attachment, and a controller. The controller is configured to control the hydraulic actuator to minimize a change in orientation of the traveling body or of the turning body, in response to a change in moment caused by an aerial movement of the attachment.

Shovel

A shovel may has a first pump that discharges a first hydraulic oil, a second pump that discharges a second hydraulic oil, a pump/motor that discharges a third hydraulic oil, an arm cylinder that at least the first hydraulic oil can flow into, and a boom cylinder that at least the second hydraulic oil can flow into. When the arm cylinder and the boom cylinder operate simultaneously, the arm cylinder is actuated by the first hydraulic oil or the third hydraulic oil, and the boom cylinder is actuated by the second hydraulic oil.

A shovel includes a first pumpL; a second pumpR; a hydraulic swing motor; a pump/motorA configured to generate an engine-assist torque in response to hydraulic oil from the hydraulic swing motorduring swing deceleration; an accumulatorconfigured to accumulate the hydraulic oil flowing out of the hydraulic swing motorduring swing deceleration; a regeneration valveG configured to switch open/close of transfer from a discharge portL to the pump/motorA and the accumulator; and a controller configured to control the regeneration valveG. During swing deceleration, the controller adjusts an open area of the regeneration valveG in such a way that a swing flowing-out pressure becomes a swing braking target pressure, and causes the hydraulic oil flowing out of the hydraulic swing motorto flow into the pump/motorA and the accumulatorat the same pressure.

In a construction machine, a boom assist cylinder (A) assists an operation of a boom () by a hydraulic pressure, and an arm assist cylinder (A) assists an operation of an arm () by a hydraulic pressure. An accumulator () accumulates operation oil to be supplied to the boom assist cylinder and the arm assist cylinder in a pressurized state. A first hydraulic pipe () connects between the boom assist cylinder and the arm assist cylinder. A second hydraulic pipe () connects between the arm assist cylinder and the accumulator. The second hydraulic pipe is connected to a hydraulic connection port of the arm assist cylinder so that the operation oil is supplied in a direction of closing the arm from the accumulator to the arm assist cylinder.

Growing community of inventors

Kanagawa, Japan

Koichiro Tsukane