Kobelco Construction Machinery Co., Ltd.

Tomohiko Asakage

Norihiko Hayashi

Hideki Kinugawa

Kazuhiko Fujii

Hirokazu Imashige

Yutaka Toji

Kazuyuki Takeda

Yoshiyasu Umezu

Yoshiki Kamon

Hisashi Kadowaki

Takanobu Nakayoshi

Masaaki Tachino

Saburo Mori

Tomoshige Tanaka

Hitoshi Hidaka

In a hydraulic excavator wherein a control valve unit having a plurality of control valves in a united form and an operation pattern switching valve for switching from one to another among combined patterns of operating valves and control valves are disposed side by side in front and rear positions respectively within a valve accommodating space formed between an upper frame base plate and a floor plate in an upper rotating body, the operation pattern switching valve is inclined forwardly downward in a state in which its upper surface side including an operating lever thereof faces an operation port being formed to the floor plate.

Construction machine

After a remote control valve has been brought into a non-working state, a stop signal is to be sent from an engine controller in a controller to a governor controller in an engine to stop the engine automatically, under the condition that an illuminating lamp is turned off, after a preset allowance time has passed and when a gate lever provided at a gateway for an operator is opened (the operator gets off the machine). Further, before the engine is stopped, the operator is to be notified of the coming engine stop, and when the engine is stopped, a power supply is to be cut off automatically.

Construction machinery

A hydraulic circuit including a first throttle disposed upstream of pressure-reducing valves of a remote-control valve, which operates a control valve of hydraulic pilot type, so as to reduce primary pressures supplied from a pilot pump to the pressure-reducing valves. Bleed-off lines connect pilot lines to tanks. Second throttles are disposed on the bleed-off lines, respectively, so as to moderate rises in the pilot pressures supplied to pilot ports of the control valve. The hydraulic circuit prevents detrimental effects such as deterioration of operability while ensuring shock absorption during quick operation.

Hydraulic circuit for construction machine

A control device for a construction machine according to the present invention is configured so that in the construction machine provided with an automatic stop function which automatically stops an engine by an engine controller upon a predetermined automatic stop condition being met, and a hydraulic lock function which sets a hydraulic actuator locked in an inactive state by a hydraulic lock controller, there is provided a restart switch, where after an automatic stop of the engine, when the restart switch is operated, a restart command is transmitted to the engine controller via a route independently of that of an engine switch and independently of a hydraulic unlock condition, and the engine is restarted.

Control device for construction machine

The prevent invention provides an oil filter comprising a filter element housed in a casing, the filter element being formed of two or more cylindrical element pieces piled on top of another in the height direction and attachably and detachably connected through connecting members. Accordingly, the efficiency in each of manufacture, stock control and storage of the filter element can be improved, and the cost can be also reduced.

Oil filter for construction machine

A engine control device for a construction machine of the present invention is configured so that the engine control device comprises a first switch for selecting effectiveness/ineffectiveness of an automatic deceleration control by a controller and a second switch for selecting effectiveness/ineffectiveness of an automatic stop control, and that when a predetermined automatic stop condition is met even if the ineffectiveness of the automatic deceleration control is selected by the controller, the automatic deceleration control which reduces an engine speed is caused to be operated for a fixed period prior to the automatic stop control.

Engine control device for construction machine

A power control device for a construction machine of the present invention is characterized by including an engine, an actuator adapted to be driven with power of the engine, an engine controller for stopping the engine automatically when it is not necessary to drive the actuator, and an air conditioner for conditioning the air in an interior of a cab of the construction machine, and in which when an air conditioner operation detecting unit detects that the air conditioner is in operation and even when an engine power necessity determining unit determines that the power of the engine is not necessary, automatic stop of the engine by the engine controller is prevented.

Power control device for construction machine

An anti-theft system for construction machines, comprising a memory which stores, as machine-side identification information, first identification information allocated construction machine by construction machine and second identification information allocated in common to plural construction machines, a first collating medium having the same identification information as the first identification information, a second collating medium having the same identification information as the second identification information, a collator which collates the identification information of the first or the second collating medium with the machine-side identification information, and an operation controller which cancels the inhibit of operation of the construction machine concerned when there is obtained a coincident collation result by the collator. With this anti-theft system, an owner of construction machines can manage the construction machines by only one type of a collating medium while preventing theft.

Growing community of inventors

Hiroshima, Japan

Tomohiko Asakage